ref: 0373255087377122eeb10e006ffb8aa1b57e611c
author: rgl <devnull@localhost>
date: Mon Feb 3 17:42:28 EST 2020
after a year or so of work, i dare create a proper repo.
--- /dev/null
+++ b/dat.h
@@ -1,0 +1,41 @@
+enum {+ K↑,
+ K↓,
+ K←,
+ K→,
+ Krise,
+ Kfall,
+ KR↑,
+ KR↓,
+ KR←,
+ KR→,
+ KR↺,
+ KR↻,
+ Kcam0,
+ Kcam1,
+ Kcam2,
+ Kcam3,
+ Kscrshot,
+ Ke
+};
+
+enum {+ Scamno,
+ Sfov,
+ Scampos,
+ Scambx, Scamby, Scambz,
+ Se
+};
+
+typedef struct Mesh Mesh;
+typedef struct TTriangle3 TTriangle3;
+
+struct Mesh {+ Triangle3 *tris;
+ int ntri;
+};
+
+struct TTriangle3 {+ Triangle3;
+ Image *tx;
+};
--- /dev/null
+++ b/fns.h
@@ -1,0 +1,2 @@
+void *erealloc(void*, ulong);
+void *emalloc(ulong);
--- /dev/null
+++ b/geometry.h
@@ -1,0 +1,110 @@
+#define DEG 0.01745329251994330
+
+typedef struct Point2 Point2;
+typedef struct Point3 Point3;
+typedef double Matrix[3][3];
+typedef double Matrix3[4][4];
+typedef struct Quaternion Quaternion;
+typedef struct RFrame RFrame;
+typedef struct RFrame3 RFrame3;
+typedef struct Triangle3 Triangle3;
+
+struct Point2 {+ double x, y, w;
+};
+
+struct Point3 {+ double x, y, z, w;
+};
+
+struct Quaternion {+ double r, i, j, k;
+};
+
+struct RFrame {+ Point2 p;
+ Point2 bx, by;
+};
+
+struct RFrame3 {+ Point3 p;
+ Point3 bx, by, bz;
+};
+
+struct Triangle3 {+ Point3 p0, p1, p2;
+};
+
+/* Point2 */
+Point2 Pt2(double, double, double);
+Point2 Vec2(double, double);
+Point2 addpt2(Point2, Point2);
+Point2 subpt2(Point2, Point2);
+Point2 mulpt2(Point2, double);
+Point2 divpt2(Point2, double);
+Point2 lerp2(Point2, Point2, double);
+double dotvec2(Point2, Point2);
+double vec2len(Point2);
+Point2 normvec2(Point2);
+
+/* Point3 */
+Point3 Pt3(double, double, double, double);
+Point3 Vec3(double, double, double);
+Point3 addpt3(Point3, Point3);
+Point3 subpt3(Point3, Point3);
+Point3 mulpt3(Point3, double);
+Point3 divpt3(Point3, double);
+Point3 lerp3(Point3, Point3, double);
+double dotvec3(Point3, Point3);
+Point3 crossvec3(Point3, Point3);
+double vec3len(Point3);
+Point3 normvec3(Point3);
+
+/* Matrix */
+void identity(Matrix);
+void addm(Matrix, Matrix);
+void subm(Matrix, Matrix);
+void mulm(Matrix, Matrix);
+void smulm(Matrix, double);
+void transposem(Matrix);
+double detm(Matrix);
+double tracem(Matrix);
+void adjm(Matrix);
+void invm(Matrix);
+Point2 xform(Point2, Matrix);
+
+/* Matrix3 */
+void identity3(Matrix3);
+void addm3(Matrix3, Matrix3);
+void subm3(Matrix3, Matrix3);
+void mulm3(Matrix3, Matrix3);
+void smulm3(Matrix3, double);
+void transposem3(Matrix3);
+double detm3(Matrix3);
+double tracem3(Matrix3);
+void adjm3(Matrix3);
+void invm3(Matrix3);
+Point3 xform3(Point3, Matrix3);
+
+/* Quaternion */
+Quaternion Quat(double, double, double, double);
+Quaternion Quatvec(double, Point3);
+Quaternion addq(Quaternion, Quaternion);
+Quaternion subq(Quaternion, Quaternion);
+Quaternion mulq(Quaternion, Quaternion);
+Quaternion smulq(Quaternion, double);
+Quaternion sdivq(Quaternion, double);
+double dotq(Quaternion, Quaternion);
+Quaternion invq(Quaternion);
+double qlen(Quaternion);
+Quaternion normq(Quaternion);
+Point3 qrotate(Point3, Point3, double);
+
+/* RFrame */
+Point2 rframexform(Point2, RFrame);
+Point3 rframexform3(Point3, RFrame3);
+Point2 invrframexform(Point2, RFrame);
+Point3 invrframexform3(Point3, RFrame3);
+
+/* Triangle3 */
+Point3 centroid(Triangle3);
--- /dev/null
+++ b/graphics.h
@@ -1,0 +1,55 @@
+typedef enum {+ Portho, /* orthographic */
+ Ppersp /* perspective */
+} Projection;
+
+typedef struct Vertex Vertex;
+typedef struct Triangle Triangle;
+typedef struct Viewport Viewport;
+typedef struct Camera Camera;
+
+struct Vertex {+ Point3 p; /* position */
+ Point3 n; /* surface normal */
+ //Image tx; /* (?) */
+};
+
+struct Triangle {+ Point p0, p1, p2;
+};
+
+struct Camera {+ RFrame3; /* VCS */
+ Image *viewport;
+ double fov; /* vertical FOV */
+ struct {+ double n, f; /* near and far clipping planes */
+ } clip;
+ Matrix3 proj; /* VCS to NDC xform */
+ Projection ptype;
+};
+
+/* Triangle */
+Triangle Trian(int, int, int, int, int, int);
+Triangle Trianpt(Point, Point, Point);
+void triangle(Image *, Triangle, int, Image *, Point);
+void filltriangle(Image *, Triangle, Image *, Point);
+
+/* Camera */
+void perspective(Matrix3, double, double, double, double);
+void orthographic(Matrix3, double, double, double, double, double, double);
+void configcamera(Camera*, Image*, double, double, double, Projection);
+void placecamera(Camera*, Point3, Point3, Point3);
+void aimcamera(Camera*, Point3);
+void reloadcamera(Camera*);
+
+/* rendering */
+#define FPS2MS(n) (1000/(n))
+#define WORLD2VCS(cp, p) (rframexform3((p), *(cp)))
+#define VCS2NDC(cp, p) (xform3((p), (cp)->proj))
+#define WORLD2NDC(cp, p) (VCS2NDC((cp), WORLD2VCS((cp), (p))))
+int isclipping(Point3);
+Point toviewport(Camera*, Point3);
+Point2 fromviewport(Camera*, Point);
+void line3(Camera *c, Point3 p0, Point3 p1, int end0, int end1, Image *src);
+Point string3(Camera *c, Point3 p, Image *src, Font *f, char *s);
--- /dev/null
+++ b/libgeometry/doc/libgeometry.ms
@@ -1,0 +1,429 @@
+.TL
+libgeometry
+.AU
+Rodrigo G. López
+.sp
+rgl@antares-labs.eu
+.AI
+Antares Telecom Laboratories
+Albatera, Alicante
+.FS
+ACHTUNG! this is a
+.B "WORK IN PROGRESS"
+.FE
+.SH
+Introduction
+.PP
+.I Libgeometry is a computational geometry library that provides all
+the utilities anybody working with graphics or scientific simulations
+could need.
+.NH 1
+Data Structures
+.NH 2
+Point2
+.P1
+struct Point2 {+ double x, y, w;
+};
+.P2
+.PP
+.I Point2
+represents a point in two-dimensional projective space, which itself
+is an extension of the two-dimensional euclidean space that allows us
+to work with vectors and compose affine transformations in a friendly
+manner. A point
+.EQ
+gfont roman
+(x, y, w)
+.EN
+made out of homogenous coordinates
+.I x ,
+.I y ,
+and
+.I w ,
+yields a point with cartesian coordinates
+.EQ
+(x/w, y/w) .
+.EN
+.NH 2
+Point3
+.P1
+struct Point3 {+ double x, y, z, w;
+};
+.P2
+.PP
+.I Point3
+is a point in three-dimensional projective space.
+.NH 2
+Matrix
+.P1
+typedef double Matrix[3][3];
+.P2
+.PP
+.I Matrix
+represents a 3x3 matrix, thought to compose affine transformations to
+apply to homogeneous 2D points.
+.NH 2
+Matrix3
+.P1
+typedef double Matrix3[4][4];
+.P2
+.PP
+.I Matrix3
+represents a 4x4 matrix, thought to compose affine transformations to
+apply to homogeneous 3D points.
+.NH 2
+Quaternion
+.P1
+struct Quaternion {+ double r, i, j, k;
+};
+.P2
+.PP
+.I Quaternions
+are a numbering system that extends the complex numbers up to
+four-dimensional space, and are used to apply rotations and model
+mechanical interactions in 3D space. Their main advantages with
+respect to their matrix relatives are increased computational and
+storage performance and gimbal lock avoidance.
+.NH 2
+RFrame
+.P1
+struct RFrame {+ Point2 p;
+ Point2 bx, by;
+};
+.P2
+.PP
+A reference frame (or frame of reference) is
+.NH 2
+RFrame3
+.P1
+struct RFrame3 {+ Point3 p;
+ Point3 bx, by, bz;
+};
+.P2
+.PP
+A reference frame (or frame of reference) is
+.NH 1
+Algorithms
+.NH 2
+Point2
+.SH
+Addition
+.P1
+Point2 addpt2(Point2 a, Point2 b)
+.P2
+.EQ
+a + b ~=~ left ( x sub a + x sub b ,~ y sub a + y sub b ,~ w sub a + w sub b right )
+.EN
+.SH
+Substraction
+.P1
+Point2 subpt2(Point2 a, Point2 b)
+.P2
+.EQ
+a - b ~=~ left ( x sub a - x sub b ,~ y sub a - y sub b ,~ w sub a - w sub b right )
+.EN
+.SH
+Multiplication
+.P1
+Point2 mulpt2(Point2 p, double s)
+.P2
+.EQ
+p * s ~=~ left ( xs,~ ys,~ ws right )
+.EN
+.SH
+Division
+.P1
+Point2 divpt2(Point2 p, double s)
+.P2
+.EQ
+p / s ~=~ left ( x over s ,~ y over s ,~ w over s right )
+.EN
+.SH
+Vector Dot Product
+.P1
+double dotvec2(Point2 a, Point2 b)
+.P2
+.EQ
+a vec ~•~ b vec ~=~ x sub a x sub b + y sub a y sub b
+.EN
+.SH
+Vector Magnitude/Length
+.P1
+double vec2len(Point2 v)
+.P2
+.EQ
+| v vec | ~=~ sqrt { x sup 2 + y sup 2 }+.EN
+.SH
+Vector Normalization
+.P1
+Point2 normvec2(Point2 v)
+.P2
+.EQ
+n vec ~=~ left ( x over {| v vec |},~ y over {| v vec |} right )+.EN
+.NH 2
+Point3
+.SH
+Addition
+.P1
+Point3 addpt3(Point3 a, Point3 b)
+.P2
+.EQ
+a + b ~=~ left ( x sub a + x sub b ,~ y sub a + y sub b ,~ z sub a + z sub b ,~ w sub a + w sub b right )
+.EN
+.SH
+Substraction
+.P1
+Point3 subpt3(Point3 a, Point3 b)
+.P2
+.EQ
+a - b ~=~ left ( x sub a - x sub b ,~ y sub a - y sub b ,~ z sub a - z sub b ,~ w sub a - w sub b right )
+.EN
+.SH
+Multiplication
+.P1
+Point3 mulpt3(Point3 p, double s)
+.P2
+.EQ
+p * s ~=~ left ( xs,~ ys,~ zs,~ ws right )
+.EN
+.SH
+Division
+.P1
+Point3 divpt3(Point3 p, double s)
+.P2
+.EQ
+p / s ~=~ left ( x over s ,~ y over s ,~ z over s ,~ w over s right )
+.EN
+.SH
+Vector Dot Product
+.P1
+double dotvec3(Point3 a, Point3 b)
+.P2
+.EQ
+a vec ~•~ b vec ~=~ x sub a x sub b + y sub a y sub b + z sub a z sub b
+.EN
+.SH
+Vector Cross Product
+.P1
+double crossvec3(Point3 a, Point3 b)
+.P2
+.EQ
+a vec ~×~ b vec ~=~ left ( y sub a z sub b - z sub a y sub b ,~
+ z sub a x sub b - x sub a z sub b ,~
+ x sub a y sub b - y sub a x sub b right )
+.EN
+.SH
+Vector Magnitude/Length
+.P1
+double vec3len(Point3 v)
+.P2
+.EQ
+| v vec | ~=~ sqrt { x sup 2 + y sup 2 + z sup 2 }+.EN
+.SH
+Vector Normalization
+.P1
+Point3 normvec3(Point3 v)
+.P2
+.EQ
+n vec ~=~ left ( x over {| v vec |},~ y over {| v vec |},~ z over {| v vec |} right )+.EN
+.NH 2
+Matrix
+.SH
+Addition
+.P1
+void addm(Matrix A, Matrix B)
+.P2
+.EQ
+( bold A + bold B ) sub {i,j} ~=~ bold A sub {i,j} + bold B sub {i,j}+.EN
+.SH
+Substraction
+.P1
+void subm(Matrix A, Matrix B)
+.P2
+.EQ
+( bold A - bold B ) sub {i,j} ~=~ bold A sub {i,j} - bold B sub {i,j}+.EN
+.SH
+Multiplication
+.P1
+void mulm(Matrix A, Matrix B)
+.P2
+.EQ
+left [ bold A bold B right ] sub {i,j} ~=~ sum from {k = 0} to 3-1 bold A sub {i,k} bold B sub {k,j}+.EN
+.SH
+Transpose
+.P1
+void transposem(Matrix M)
+.P2
+.EQ
+( bold M sup T ) sub {i,j} ~=~ bold A sub {j,i}+.EN
+.SH
+Identity
+.P1
+void identity(Matrix M)
+.P2
+.EQ
+bold M ~=~ left [ rpile {+ 1 ~ 0 ~ 0
+above 0 ~ 1 ~ 0
+above 0 ~ 0 ~ 1
+} right ]
+.EN
+.SH
+Determinant
+.P1
+double detm(Matrix M)
+.P2
+.EQ
+det( bold M ) ~=~ lpile {+ m sub 00 ( m sub 11 m sub 22 - m sub 12 m sub 21 ) +
+above m sub 01 ( m sub 12 m sub 20 - m sub 10 m sub 22 ) +
+above m sub 02 ( m sub 10 m sub 21 - m sub 11 m sub 20 )
+}
+.EN
+.NH 2
+Matrix3
+.SH
+Addition
+.P1
+void addm3(Matrix3 A, Matrix3 B)
+.P2
+.EQ
+( bold A + bold B ) sub {i,j} ~=~ bold A sub {i,j} + bold B sub {i,j}+.EN
+.SH
+Substraction
+.P1
+void subm3(Matrix3 A, Matrix3 B)
+.P2
+.EQ
+( bold A - bold B ) sub {i,j} ~=~ bold A sub {i,j} - bold B sub {i,j}+.EN
+.SH
+Multiplication
+.P1
+void mulm3(Matrix3 A, Matrix3 B)
+.P2
+.EQ
+left [ bold A bold B right ] sub {i,j} ~=~ sum from {k = 0} to 4-1 bold A sub {i,k} bold B sub {k,j}+.EN
+.SH
+Transpose
+.P1
+void transposem3(Matrix3 M)
+.P2
+.EQ
+( bold M sup T ) sub {i,j} ~=~ bold A sub {j,i}+.EN
+.SH
+Identity
+.P1
+void identity3(Matrix3 M)
+.P2
+.EQ
+bold M ~=~ left [ rpile {+ 1 ~ 0 ~ 0 ~ 0
+above 0 ~ 1 ~ 0 ~ 0
+above 0 ~ 0 ~ 1 ~ 0
+above 0 ~ 0 ~ 0 ~ 1
+} right ]
+.EN
+.SH
+Determinant
+.P1
+double detm3(Matrix3 M)
+.P2
+.EQ
+det( bold M ) ~=~ rpile {+ m sub 00 ( m sub 11 ( m sub 22 m sub 33 - m sub 23 m sub 32 ) +
+ m sub 12 ( m sub 23 m sub 31 - m sub 21 m sub 33 ) +
+ m sub 13 ( m sub 21 m sub 32 - m sub 22 m sub 31 ) )
+above -m sub 01 ( m sub 10 ( m sub 22 m sub 33 - m sub 23 m sub 32 ) +
+ m sub 12 ( m sub 23 m sub 30 - m sub 20 m sub 33 ) +
+ m sub 13 ( m sub 20 m sub 32 - m sub 22 m sub 30 ) )
+above +m sub 02 ( m sub 10 ( m sub 21 m sub 33 - m sub 23 m sub 31 ) +
+ m sub 11 ( m sub 23 m sub 30 - m sub 20 m sub 33 ) +
+ m sub 13 ( m sub 20 m sub 31 - m sub 21 m sub 30 ) )
+above -m sub 03 ( m sub 10 ( m sub 21 m sub 32 - m sub 22 m sub 31 ) +
+ m sub 11 ( m sub 22 m sub 30 - m sub 20 m sub 32 ) +
+ m sub 12 ( m sub 20 m sub 31 - m sub 21 m sub 30 ) )
+}
+.EN
+.NH 2
+Quaternion
+.SH
+Addition
+.P1
+Quaternion addq(Quaternion q, Quaternion r)
+.P2
+.EQ
+q + r ~=~ ( r sub q + r sub r ,~ i sub q + i sub r ,~ j sub q + j sub r ,~ k sub q + k sub r )
+.EN
+.SH
+Substraction
+.P1
+Quaternion subq(Quaternion q, Quaternion r)
+.P2
+.EQ
+q - r ~=~ ( r sub q - r sub r ,~ i sub q - i sub r ,~ j sub q - j sub r ,~ k sub q - k sub r )
+.EN
+.SH
+Multiplication
+.P1
+Quaternion mulq(Quaternion q, Quaternion r)
+.P2
+.EQ
+q ~=~ [ r sub q ,~ v vec sub q ]
+r ~=~ [ r sub r ,~ v vec sub r ]
+qr ~=~ [ r sub q r sub r - v vec sub q • v vec sub r ,~ v vec sub r r sub q + v vec sub q r sub r + v vec sub q X v vec sub r ]
+.EN
+.SH
+Scalar Multiplication
+.P1
+Quaternion smulq(Quaternion q, double s)
+.P2
+.EQ
+qs ~=~ [ r sub q s ,~ i sub q s ,~ j sub q s ,~ k sub q s ]
+.EN
+.SH
+Inverse
+.P1
+Quaternion invq(Quaternion q)
+.P2
+.EQ
+q sup -1 ~=~ left ( r over {| q | sup 2} ,~ -i over {| q | sup 2} ,~ -j over {| q | sup 2} ,~ -k over {| q | sup 2} right )+.EN
+.SH
+Magnitude/Length
+.P1
+double qlen(Quaternion q)
+.P2
+.EQ
+| q | ~=~ sqrt { r sup 2 + i sup 2 + j sup 2 + k sup 2 }+.EN
+.NH 2
+RFrame
+.SH
+Change of reference
+.P1
+Point2 rframexform(Point2 p, RFrame rf)
+.P2
+.NH 2
+RFrame3
+.SH
+Change of reference
+.P1
+Point3 rframexform3(Point3 p, RFrame3 rf)
+.P2
binary files /dev/null b/libgeometry/doc/libgeometry.pdf differ
--- /dev/null
+++ b/libgeometry/doc/libgeometry.ps
@@ -1,0 +1,2799 @@
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+cleartomark
+showpage
+saveobj restore
+%%EndPage: 6 6
+%%Trailer
+done
+%%DocumentFonts: LucidaSansUnicode20 LucidaSansUnicode21 LucidaSansUnicode22 S1 S LucidaSansUnicode00 LucidaSans-Demi LucidaSans-Italic LucidaTypewriter
+%%Pages: 6
--- /dev/null
+++ b/libgeometry/doc/mkfile
@@ -1,0 +1,15 @@
+FONTS='.FP lucidasans'
+DOCNAME=libgeometry
+
+all:VQ: $DOCNAME.ps $DOCNAME.pdf
+
+clean:VQ:
+ rm -f $DOCNAME.ps $DOCNAME.pdf
+
+$DOCNAME.ps:V: $DOCNAME.ms
+ {echo $FONTS; cat $prereq}> _$prereq+ eval `{doctype _$prereq} | lp -dstdout > $target && rm -f _$prereq+
+$DOCNAME.pdf:V: $DOCNAME.ps
+ cat /sys/doc/docfonts $prereq > _$prereq
+ ps2pdf _$prereq $target && rm -f _$prereq
--- /dev/null
+++ b/libgeometry/matrix.c
@@ -1,0 +1,348 @@
+#include <u.h>
+#include <libc.h>
+#include "../geometry.h"
+
+/* 2D */
+
+void
+identity(Matrix m)
+{+ memset(m, 0, 3*3*sizeof(double));
+ m[0][0] = m[1][1] = m[2][2] = 1;
+}
+
+void
+addm(Matrix a, Matrix b)
+{+ int i, j;
+
+ for(i = 0; i < 3; i++)
+ for(j = 0; j < 3; j++)
+ a[i][j] += b[i][j];
+}
+
+void
+subm(Matrix a, Matrix b)
+{+ int i, j;
+
+ for(i = 0; i < 3; i++)
+ for(j = 0; j < 3; j++)
+ a[i][j] -= b[i][j];
+}
+
+void
+mulm(Matrix a, Matrix b)
+{+ int i, j, k;
+ Matrix tmp;
+
+ for(i = 0; i < 3; i++)
+ for(j = 0; j < 3; j++){+ tmp[i][j] = 0;
+ for(k = 0; k < 3; k++)
+ tmp[i][j] += a[i][k]*b[k][j];
+ }
+ memmove(a, tmp, 3*3*sizeof(double));
+}
+
+void
+smulm(Matrix m, double s)
+{+ int i, j;
+
+ for(i = 0; i < 3; i++)
+ for(j = 0; j < 3; j++)
+ m[i][j] *= s;
+}
+
+void
+transposem(Matrix m)
+{+ int i, j;
+ double tmp;
+
+ for(i = 0; i < 3; i++)
+ for(j = i; j < 3; j++){+ tmp = m[i][j];
+ m[i][j] = m[j][i];
+ m[j][i] = tmp;
+ }
+}
+
+double
+detm(Matrix m)
+{+ return m[0][0]*(m[1][1]*m[2][2] - m[1][2]*m[2][1])+
+ m[0][1]*(m[1][2]*m[2][0] - m[1][0]*m[2][2])+
+ m[0][2]*(m[1][0]*m[2][1] - m[1][1]*m[2][0]);
+}
+
+double
+tracem(Matrix m)
+{+ return m[0][0] + m[1][1] + m[2][2];
+}
+
+void
+adjm(Matrix m)
+{+ Matrix tmp;
+
+ tmp[0][0] = m[1][1]*m[2][2] - m[1][2]*m[2][1];
+ tmp[0][1] = -m[0][1]*m[2][2] + m[0][2]*m[2][1];
+ tmp[0][2] = m[0][1]*m[1][2] - m[0][2]*m[1][1];
+ tmp[1][0] = -m[1][0]*m[2][2] + m[1][2]*m[2][0];
+ tmp[1][1] = m[0][0]*m[2][2] - m[0][2]*m[2][0];
+ tmp[1][2] = -m[0][0]*m[1][2] + m[0][2]*m[1][0];
+ tmp[2][0] = m[1][0]*m[2][1] - m[1][1]*m[2][0];
+ tmp[2][1] = -m[0][0]*m[2][1] + m[0][1]*m[2][0];
+ tmp[2][2] = m[0][0]*m[1][1] - m[0][1]*m[1][0];
+ memmove(m, tmp, 3*3*sizeof(double));
+}
+
+/* Cayley-Hamilton */
+//void
+//invertm(Matrix m)
+//{+// Matrix m², r;
+// double det, trm, trm²;
+//
+// det = detm(m);
+// if(det == 0)
+// return;
+// trm = tracem(m);
+// memmove(m², m, 3*3*sizeof(double));
+// mulm(m², m²);
+// trm² = tracem(m²);
+// identity(r);
+// smulm(r, (trm*trm - trm²)/2);
+// smulm(m, trm);
+// subm(r, m);
+// addm(r, m²);
+// smulm(r, 1/det);
+// memmove(m, r, 3*3*sizeof(double));
+//}
+
+/* Cramer's */
+void
+invm(Matrix m)
+{+ double det;
+
+ det = detm(m);
+ if(det == 0)
+ return; /* singular matrices are not invertible */
+ adjm(m);
+ smulm(m, 1/det);
+}
+
+Point2
+xform(Point2 p, Matrix m)
+{+ return (Point2){+ p.x*m[0][0] + p.y*m[0][1] + p.w*m[0][2],
+ p.x*m[1][0] + p.y*m[1][1] + p.w*m[1][2],
+ p.x*m[2][0] + p.y*m[2][1] + p.w*m[2][2]
+ };
+}
+
+/* 3D */
+
+void
+identity3(Matrix3 m)
+{+ memset(m, 0, 4*4*sizeof(double));
+ m[0][0] = m[1][1] = m[2][2] = m[3][3] = 1;
+}
+
+void
+addm3(Matrix3 a, Matrix3 b)
+{+ int i, j;
+
+ for(i = 0; i < 4; i++)
+ for(j = 0; j < 4; j++)
+ a[i][j] += b[i][j];
+}
+
+void
+subm3(Matrix3 a, Matrix3 b)
+{+ int i, j;
+
+ for(i = 0; i < 4; i++)
+ for(j = 0; j < 4; j++)
+ a[i][j] -= b[i][j];
+}
+
+void
+mulm3(Matrix3 a, Matrix3 b)
+{+ int i, j, k;
+ Matrix3 tmp;
+
+ for(i = 0; i < 4; i++)
+ for(j = 0; j < 4; j++){+ tmp[i][j] = 0;
+ for(k = 0; k < 4; k++)
+ tmp[i][j] += a[i][k]*b[k][j];
+ }
+ memmove(a, tmp, 4*4*sizeof(double));
+}
+
+void
+smulm3(Matrix3 m, double s)
+{+ int i, j;
+
+ for(i = 0; i < 4; i++)
+ for(j = 0; j < 4; j++)
+ m[i][j] *= s;
+}
+
+void
+transposem3(Matrix3 m)
+{+ int i, j;
+ double tmp;
+
+ for(i = 0; i < 4; i++)
+ for(j = i; j < 4; j++){+ tmp = m[i][j];
+ m[i][j] = m[j][i];
+ m[j][i] = tmp;
+ }
+}
+
+double
+detm3(Matrix3 m)
+{+ return m[0][0]*(m[1][1]*(m[2][2]*m[3][3] - m[2][3]*m[3][2])+
+ m[1][2]*(m[2][3]*m[3][1] - m[2][1]*m[3][3])+
+ m[1][3]*(m[2][1]*m[3][2] - m[2][2]*m[3][1]))
+ -m[0][1]*(m[1][0]*(m[2][2]*m[3][3] - m[2][3]*m[3][2])+
+ m[1][2]*(m[2][3]*m[3][0] - m[2][0]*m[3][3])+
+ m[1][3]*(m[2][0]*m[3][2] - m[2][2]*m[3][0]))
+ +m[0][2]*(m[1][0]*(m[2][1]*m[3][3] - m[2][3]*m[3][1])+
+ m[1][1]*(m[2][3]*m[3][0] - m[2][0]*m[3][3])+
+ m[1][3]*(m[2][0]*m[3][1] - m[2][1]*m[3][0]))
+ -m[0][3]*(m[1][0]*(m[2][1]*m[3][2] - m[2][2]*m[3][1])+
+ m[1][1]*(m[2][2]*m[3][0] - m[2][0]*m[3][2])+
+ m[1][2]*(m[2][0]*m[3][1] - m[2][1]*m[3][0]));
+}
+
+double
+tracem3(Matrix3 m)
+{+ return m[0][0] + m[1][1] + m[2][2] + m[3][3];
+}
+
+void
+adjm3(Matrix3 m)
+{+ Matrix3 tmp;
+
+ tmp[0][0]=m[1][1]*(m[2][2]*m[3][3] - m[2][3]*m[3][2])+
+ m[2][1]*(m[1][3]*m[3][2] - m[1][2]*m[3][3])+
+ m[3][1]*(m[1][2]*m[2][3] - m[1][3]*m[2][2]);
+ tmp[0][1]=m[0][1]*(m[2][3]*m[3][2] - m[2][2]*m[3][3])+
+ m[2][1]*(m[0][2]*m[3][3] - m[0][3]*m[3][2])+
+ m[3][1]*(m[0][3]*m[2][2] - m[0][2]*m[2][3]);
+ tmp[0][2]=m[0][1]*(m[1][2]*m[3][3] - m[1][3]*m[3][2])+
+ m[1][1]*(m[0][3]*m[3][2] - m[0][2]*m[3][3])+
+ m[3][1]*(m[0][2]*m[1][3] - m[0][3]*m[1][2]);
+ tmp[0][3]=m[0][1]*(m[1][3]*m[2][2] - m[1][2]*m[2][3])+
+ m[1][1]*(m[0][2]*m[2][3] - m[0][3]*m[2][2])+
+ m[2][1]*(m[0][3]*m[1][2] - m[0][2]*m[1][3]);
+ tmp[1][0]=m[1][0]*(m[2][3]*m[3][2] - m[2][2]*m[3][3])+
+ m[2][0]*(m[1][2]*m[3][3] - m[1][3]*m[3][2])+
+ m[3][0]*(m[1][3]*m[2][2] - m[1][2]*m[2][3]);
+ tmp[1][1]=m[0][0]*(m[2][2]*m[3][3] - m[2][3]*m[3][2])+
+ m[2][0]*(m[0][3]*m[3][2] - m[0][2]*m[3][3])+
+ m[3][0]*(m[0][2]*m[2][3] - m[0][3]*m[2][2]);
+ tmp[1][2]=m[0][0]*(m[1][3]*m[3][2] - m[1][2]*m[3][3])+
+ m[1][0]*(m[0][2]*m[3][3] - m[0][3]*m[3][2])+
+ m[3][0]*(m[0][3]*m[1][2] - m[0][2]*m[1][3]);
+ tmp[1][3]=m[0][0]*(m[1][2]*m[2][3] - m[1][3]*m[2][2])+
+ m[1][0]*(m[0][3]*m[2][2] - m[0][2]*m[2][3])+
+ m[2][0]*(m[0][2]*m[1][3] - m[0][3]*m[1][2]);
+ tmp[2][0]=m[1][0]*(m[2][1]*m[3][3] - m[2][3]*m[3][1])+
+ m[2][0]*(m[1][3]*m[3][1] - m[1][1]*m[3][3])+
+ m[3][0]*(m[1][1]*m[2][3] - m[1][3]*m[2][1]);
+ tmp[2][1]=m[0][0]*(m[2][3]*m[3][1] - m[2][1]*m[3][3])+
+ m[2][0]*(m[0][1]*m[3][3] - m[0][3]*m[3][1])+
+ m[3][0]*(m[0][3]*m[2][1] - m[0][1]*m[2][3]);
+ tmp[2][2]=m[0][0]*(m[1][1]*m[3][3] - m[1][3]*m[3][1])+
+ m[1][0]*(m[0][3]*m[3][1] - m[0][1]*m[3][3])+
+ m[3][0]*(m[0][1]*m[1][3] - m[0][3]*m[1][1]);
+ tmp[2][3]=m[0][0]*(m[1][3]*m[2][1] - m[1][1]*m[2][3])+
+ m[1][0]*(m[0][1]*m[2][3] - m[0][3]*m[2][1])+
+ m[2][0]*(m[0][3]*m[1][1] - m[0][1]*m[1][3]);
+ tmp[3][0]=m[1][0]*(m[2][2]*m[3][1] - m[2][1]*m[3][2])+
+ m[2][0]*(m[1][1]*m[3][2] - m[1][2]*m[3][1])+
+ m[3][0]*(m[1][2]*m[2][1] - m[1][1]*m[2][2]);
+ tmp[3][1]=m[0][0]*(m[2][1]*m[3][2] - m[2][2]*m[3][1])+
+ m[2][0]*(m[0][2]*m[3][1] - m[0][1]*m[3][2])+
+ m[3][0]*(m[0][1]*m[2][2] - m[0][2]*m[2][1]);
+ tmp[3][2]=m[0][0]*(m[1][2]*m[3][1] - m[1][1]*m[3][2])+
+ m[1][0]*(m[0][1]*m[3][2] - m[0][2]*m[3][1])+
+ m[3][0]*(m[0][2]*m[1][1] - m[0][1]*m[1][2]);
+ tmp[3][3]=m[0][0]*(m[1][1]*m[2][2] - m[1][2]*m[2][1])+
+ m[1][0]*(m[0][2]*m[2][1] - m[0][1]*m[2][2])+
+ m[2][0]*(m[0][1]*m[1][2] - m[0][2]*m[1][1]);
+ memmove(m, tmp, 4*4*sizeof(double));
+}
+
+/* Cayley-Hamilton */
+//void
+//invertm3(Matrix3 m)
+//{+// Matrix3 m², m³, r;
+// double det, trm, trm², trm³;
+//
+// det = detm3(m);
+// if(det == 0)
+// return;
+// trm = tracem3(m);
+// memmove(m³, m, 4*4*sizeof(double));
+// mulm(m³, m³);
+// mulm(m³, m);
+// trm³ = tracem3(m³);
+// memmove(m², m, 4*4*sizeof(double));
+// mulm(m², m²);
+// trm² = tracem3(m²);
+// identity3(r);
+// smulm3(r, (trm*trm*trm - 3*trm*trm² + 2*trm³)/6);
+// smulm3(m, (trm*trm - trm²)/2);
+// smulm3(m², trm);
+// subm(r, m);
+// addm(r, m²);
+// subm(r, m³);
+// smulm(r, 1/det);
+// memmove(m, r, 4*4*sizeof(double));
+//}
+
+/* Cramer's */
+void
+invm3(Matrix3 m)
+{+ double det;
+
+ det = detm3(m);
+ if(det == 0)
+ return; /* singular matrices are not invertible */
+ adjm3(m);
+ smulm3(m, 1/det);
+}
+
+Point3
+xform3(Point3 p, Matrix3 m)
+{+ return (Point3){+ p.x*m[0][0] + p.y*m[0][1] + p.z*m[0][2] + p.w*m[0][3],
+ p.x*m[1][0] + p.y*m[1][1] + p.z*m[1][2] + p.w*m[1][3],
+ p.x*m[2][0] + p.y*m[2][1] + p.z*m[2][2] + p.w*m[2][3],
+ p.x*m[3][0] + p.y*m[3][1] + p.z*m[3][2] + p.w*m[3][3],
+ };
+}
--- /dev/null
+++ b/libgeometry/mkfile
@@ -1,0 +1,13 @@
+</$objtype/mkfile
+
+LIB=../libgeometry.a$O
+OFILES=\
+ point.$O\
+ matrix.$O\
+ quaternion.$O\
+ rframe.$O\
+ triangle.$O\
+
+HFILES=../geometry.h
+
+</sys/src/cmd/mklib
--- /dev/null
+++ b/libgeometry/point.c
@@ -1,0 +1,161 @@
+#include <u.h>
+#include <libc.h>
+#include "../geometry.h"
+
+/* 2D */
+
+Point2
+Pt2(double x, double y, double w)
+{+ return (Point2){x, y, w};+}
+
+Point2
+Vec2(double x, double y)
+{+ return (Point2){x, y, 0};+}
+
+Point2
+addpt2(Point2 a, Point2 b)
+{+ return (Point2){a.x+b.x, a.y+b.y, a.w+b.w};+}
+
+Point2
+subpt2(Point2 a, Point2 b)
+{+ return (Point2){a.x-b.x, a.y-b.y, a.w-b.w};+}
+
+Point2
+mulpt2(Point2 p, double s)
+{+ return (Point2){p.x*s, p.y*s, p.w*s};+}
+
+Point2
+divpt2(Point2 p, double s)
+{+ return (Point2){p.x/s, p.y/s, p.w/s};+}
+
+Point2
+lerp2(Point2 a, Point2 b, double t)
+{+ if(t < 0) t = 0;
+ if(t > 1) t = 1;
+ return (Point2){+ (1 - t)*a.x + t*b.x,
+ (1 - t)*a.y + t*b.y,
+ (1 - t)*a.w + t*b.w
+ };
+}
+
+double
+dotvec2(Point2 a, Point2 b)
+{+ return a.x*b.x + a.y*b.y;
+}
+
+double
+vec2len(Point2 v)
+{+ return sqrt(dotvec2(v, v));
+}
+
+Point2
+normvec2(Point2 v)
+{+ double len;
+
+ len = vec2len(v);
+ if(len == 0)
+ return (Point2){0, 0, 0};+ return (Point2){v.x/len, v.y/len, 0};+}
+
+/* 3D */
+
+Point3
+Pt3(double x, double y, double z, double w)
+{+ return (Point3){x, y, z, w};+}
+
+Point3
+Vec3(double x, double y, double z)
+{+ return (Point3){x, y, z, 0};+}
+
+Point3
+addpt3(Point3 a, Point3 b)
+{+ return (Point3){a.x+b.x, a.y+b.y, a.z+b.z, a.w+b.w};+}
+
+Point3
+subpt3(Point3 a, Point3 b)
+{+ return (Point3){a.x-b.x, a.y-b.y, a.z-b.z, a.w-b.w};+}
+
+Point3
+mulpt3(Point3 p, double s)
+{+ return (Point3){p.x*s, p.y*s, p.z*s, p.w*s};+}
+
+Point3
+divpt3(Point3 p, double s)
+{+ return (Point3){p.x/s, p.y/s, p.z/s, p.w/s};+}
+
+Point3
+lerp3(Point3 a, Point3 b, double t)
+{+ if(t < 0) t = 0;
+ if(t > 1) t = 1;
+ return (Point3){+ (1 - t)*a.x + t*b.x,
+ (1 - t)*a.y + t*b.y,
+ (1 - t)*a.z + t*b.z,
+ (1 - t)*a.w + t*b.w
+ };
+}
+
+double
+dotvec3(Point3 a, Point3 b)
+{+ return a.x*b.x + a.y*b.y + a.z*b.z;
+}
+
+Point3
+crossvec3(Point3 a, Point3 b)
+{+ return (Point3){+ a.y*b.z - a.z*b.y,
+ a.z*b.x - a.x*b.z,
+ a.x*b.y - a.y*b.x,
+ 0
+ };
+}
+
+double
+vec3len(Point3 v)
+{+ return sqrt(dotvec3(v, v));
+}
+
+Point3
+normvec3(Point3 v)
+{+ double len;
+
+ len = vec3len(v);
+ if(len == 0)
+ return (Point3){0, 0, 0, 0};+ return (Point3){v.x/len, v.y/len, v.z/len, 0};+}
--- /dev/null
+++ b/libgeometry/quaternion.c
@@ -1,0 +1,90 @@
+#include <u.h>
+#include <libc.h>
+#include "../geometry.h"
+
+Quaternion
+Quat(double r, double i, double j, double k)
+{+ return (Quaternion){r, i, j, k};+}
+
+Quaternion
+Quatvec(double s, Point3 v)
+{+ return (Quaternion){s, v.x, v.y, v.z};+}
+
+Quaternion
+addq(Quaternion a, Quaternion b)
+{+ return (Quaternion){a.r+b.r, a.i+b.i, a.j+b.j, a.k+b.k};+}
+
+Quaternion
+subq(Quaternion a, Quaternion b)
+{+ return (Quaternion){a.r-b.r, a.i-b.i, a.j-b.j, a.k-b.k};+}
+
+Quaternion
+mulq(Quaternion q, Quaternion r)
+{+ Point3 qv, rv, tmp;
+
+ qv = Vec3(q.i, q.j, q.k);
+ rv = Vec3(r.i, r.j, r.k);
+ tmp = addpt3(addpt3(mulpt3(rv, q.r), mulpt3(qv, r.r)), crossvec3(qv, rv));
+ return (Quaternion){q.r*r.r - dotvec3(qv, rv), tmp.x, tmp.y, tmp.z};+}
+
+Quaternion
+smulq(Quaternion q, double s)
+{+ return (Quaternion){q.r*s, q.i*s, q.j*s, q.k*s};+}
+
+Quaternion
+sdivq(Quaternion q, double s)
+{+ return (Quaternion){q.r/s, q.i/s, q.j/s, q.k/s};+}
+
+double
+dotq(Quaternion q, Quaternion r)
+{+ return q.r*r.r + q.i*r.i + q.j*r.j + q.k*r.k;
+}
+
+Quaternion
+invq(Quaternion q)
+{+ double len²;
+
+ len² = dotq(q, q);
+ if(len² == 0)
+ return (Quaternion){0, 0, 0, 0};+ return (Quaternion){q.r/len², -q.i/len², -q.j/len², -q.k/len²};+}
+
+double
+qlen(Quaternion q)
+{+ return sqrt(q.r*q.r + q.i*q.i + q.j*q.j + q.k*q.k);
+}
+
+Quaternion
+normq(Quaternion q)
+{+ return sdivq(q, qlen(q));
+}
+
+Point3
+qrotate(Point3 p, Point3 axis, double angle)
+{+ Quaternion qaxis, qr;
+
+ angle /= 2;
+ qaxis = Quatvec(cos(angle), mulpt3(axis, sin(angle)));
+ qr = mulq(mulq(qaxis, Quatvec(0, p)), invq(qaxis));
+ return Vec3(qr.i, qr.j, qr.k);
+}
--- /dev/null
+++ b/libgeometry/rframe.c
@@ -1,0 +1,51 @@
+#include <u.h>
+#include <libc.h>
+#include "../geometry.h"
+
+Point2
+rframexform(Point2 p, RFrame rf)
+{+ Matrix m = {+ rf.bx.x, rf.bx.y, -dotvec2(rf.bx, rf.p),
+ rf.by.x, rf.by.y, -dotvec2(rf.by, rf.p),
+ 0, 0, 1,
+ };
+ return xform(p, m);
+}
+
+Point3
+rframexform3(Point3 p, RFrame3 rf)
+{+ Matrix3 m = {+ rf.bx.x, rf.bx.y, rf.bx.z, -dotvec3(rf.bx, rf.p),
+ rf.by.x, rf.by.y, rf.by.z, -dotvec3(rf.by, rf.p),
+ rf.bz.x, rf.bz.y, rf.bz.z, -dotvec3(rf.bz, rf.p),
+ 0, 0, 0, 1,
+ };
+ return xform3(p, m);
+}
+
+Point2
+invrframexform(Point2 p, RFrame rf)
+{+ Matrix m = {+ rf.bx.x, rf.bx.y, -dotvec2(rf.bx, rf.p),
+ rf.by.x, rf.by.y, -dotvec2(rf.by, rf.p),
+ 0, 0, 1,
+ };
+ invm(m);
+ return xform(p, m);
+}
+
+Point3
+invrframexform3(Point3 p, RFrame3 rf)
+{+ Matrix3 m = {+ rf.bx.x, rf.bx.y, rf.bx.z, -dotvec3(rf.bx, rf.p),
+ rf.by.x, rf.by.y, rf.by.z, -dotvec3(rf.by, rf.p),
+ rf.bz.x, rf.bz.y, rf.bz.z, -dotvec3(rf.bz, rf.p),
+ 0, 0, 0, 1,
+ };
+ invm3(m);
+ return xform3(p, m);
+}
--- /dev/null
+++ b/libgeometry/triangle.c
@@ -1,0 +1,9 @@
+#include <u.h>
+#include <libc.h>
+#include "../geometry.h"
+
+Point3
+centroid(Triangle3 t)
+{+ return divpt3(addpt3(t.p0, addpt3(t.p1, t.p2)), 3);
+}
--- /dev/null
+++ b/libgraphics/camera.c
@@ -1,0 +1,103 @@
+#include <u.h>
+#include <libc.h>
+#include <draw.h>
+#include "../geometry.h"
+#include "../graphics.h"
+
+static int
+max(int a, int b)
+{+ return a > b ? a : b;
+}
+
+static void
+verifycfg(Camera *c)
+{+ assert(c->viewport != nil);
+ if(c->ptype == Ppersp)
+ assert(c->fov >= 1 && c->fov < 360);
+ assert(c->clip.n > 0 && c->clip.n < c->clip.f);
+}
+
+void
+perspective(Matrix3 m, double fov, double a, double n, double f)
+{+ double cotan;
+
+ cotan = 1/tan(fov/2*DEG);
+ identity3(m);
+ m[0][0] = cotan/a;
+ m[1][1] = cotan;
+ m[2][2] = -(f+n)/(f-n);
+ m[2][3] = -2*f*n/(f-n);
+ m[3][2] = -1;
+}
+
+void
+orthographic(Matrix3 m, double l, double r, double b, double t, double n, double f)
+{+ identity3(m);
+ m[0][0] = 2/(r - l);
+ m[1][1] = 2/(t - b);
+ m[2][2] = -2/(f - n);
+ m[0][3] = -(r + l)/(r - l);
+ m[1][3] = -(t + b)/(t - b);
+ m[2][3] = -(f + n)/(f - n);
+}
+
+void
+configcamera(Camera *c, Image *v, double fov, double n, double f, Projection p)
+{+ c->viewport = v;
+ c->fov = fov;
+ c->clip.n = n;
+ c->clip.f = f;
+ c->ptype = p;
+ reloadcamera(c);
+}
+
+void
+placecamera(Camera *c, Point3 p, Point3 focus, Point3 up)
+{+ c->p = p;
+ if(focus.w == 0)
+ c->bz = focus;
+ else
+ c->bz = normvec3(subpt3(c->p, focus));
+ c->bx = normvec3(crossvec3(up, c->bz));
+ c->by = crossvec3(c->bz, c->bx);
+}
+
+void
+aimcamera(Camera *c, Point3 focus)
+{+ placecamera(c, c->p, focus, c->by);
+}
+
+void
+reloadcamera(Camera *c)
+{+ double a;
+ double l, r, b, t;
+
+ verifycfg(c);
+ switch(c->ptype){+ case Portho:
+ /*
+ r = Dx(c->viewport->r)/2;
+ t = Dy(c->viewport->r)/2;
+ l = -r;
+ b = -t;
+ */
+ l = t = 0;
+ r = Dx(c->viewport->r);
+ b = Dy(c->viewport->r);
+ orthographic(c->proj, l, r, b, t, c->clip.n, c->clip.f);
+ break;
+ case Ppersp:
+ a = (double)Dx(c->viewport->r)/Dy(c->viewport->r);
+ perspective(c->proj, c->fov, a, c->clip.n, c->clip.f);
+ break;
+ default: sysfatal("unknown projection type");+ }
+}
--- /dev/null
+++ b/libgraphics/doc/libgraphics.ms
@@ -1,0 +1,34 @@
+.TL
+libgraphics
+.AU
+Rodrigo G. López
+.sp
+rgl@antares-labs.eu
+.AI
+Antares Telecom Laboratories
+Albatera, Alicante
+.FS
+ACHTUNG! this is a
+.B "WORK IN PROGRESS"
+.FE
+.NH 1
+Data Structures
+.NH 2
+Camera
+.P1
+struct Camera {+ RFrame3; /* VCS */
+ Image *viewport;
+ double fov; /* vertical FOV */
+ struct {+ double n, f; /* near and far clipping planes */
+ } clip;
+ Projection ptype;
+ Matrix3 proj; /* VCS to viewport xform */
+};
+.P2
+.PP
+A camera is an image capturing entity, analog to the real world device
+we all know, that allows us to see the virtual 3-D world by projecting
+it into a viewport we can attach to a screen or window for real-time
+visualization or write out into a file.
--- /dev/null
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+10 /LucidaSansUnicode00 f
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+cleartomark
+showpage
+saveobj restore
+%%EndPage: 1 1
+%%Trailer
+done
+%%DocumentFonts: S1 LucidaSansUnicode00 LucidaSans-Demi LucidaSans-Italic LucidaTypewriter
+%%Pages: 1
--- /dev/null
+++ b/libgraphics/doc/mkfile
@@ -1,0 +1,15 @@
+FONTS='.FP lucidasans'
+DOCNAME=libgraphics
+
+all:VQ: $DOCNAME.ps $DOCNAME.pdf
+
+clean:VQ:
+ rm -f $DOCNAME.ps $DOCNAME.pdf
+
+$DOCNAME.ps:V: $DOCNAME.ms
+ {echo $FONTS; cat $prereq}> _$prereq+ eval `{doctype _$prereq} | lp -dstdout > $target && rm -f _$prereq+
+$DOCNAME.pdf:V: $DOCNAME.ps
+ cat /sys/doc/docfonts $prereq > _$prereq
+ ps2pdf _$prereq $target && rm -f _$prereq
--- /dev/null
+++ b/libgraphics/mkfile
@@ -1,0 +1,11 @@
+</$objtype/mkfile
+
+LIB=../libgraphics.a$O
+OFILES=\
+ triangle.$O\
+ camera.$O\
+ render.$O\
+
+HFILES=../graphics.h
+
+</sys/src/cmd/mklib
--- /dev/null
+++ b/libgraphics/render.c
@@ -1,0 +1,84 @@
+#include <u.h>
+#include <libc.h>
+#include <draw.h>
+#include "../geometry.h"
+#include "../graphics.h"
+
+/*
+ * careful with concurrent rendering.
+ * use a lock or embed on each routine.
+ */
+static RFrame imgrframe = {+ 0, 0, 1, /* p */
+ 1, 0, 0, /* bx */
+ 0, -1, 0 /* by */
+};
+
+/* requires p to be in NDC */
+int
+isclipping(Point3 p)
+{+ if(p.x > p.w || p.x < -p.w ||
+ p.y > p.w || p.y < -p.w ||
+ p.z > p.w || p.z < 0)
+ return 1;
+ return 0;
+}
+
+static Point2
+flatten(Camera *c, Point3 p)
+{+ Point2 p2;
+ Matrix S = {+ Dx(c->viewport->r)/2, 0, 0,
+ 0, Dy(c->viewport->r)/2, 0,
+ 0, 0, 1,
+ }, T = {+ 1, 0, 1,
+ 0, 1, 1,
+ 0, 0, 1,
+ };
+
+ p2 = (Point2){p.x, p.y, p.w};+ if(p2.w != 0)
+ p2 = divpt2(p2, p2.w);
+ mulm(S, T);
+ p2 = xform(p2, S);
+ return p2;
+}
+
+Point
+toviewport(Camera *c, Point3 p)
+{+ Point2 p2;
+
+ imgrframe.p = Pt2(c->viewport->r.min.x, c->viewport->r.max.y, 1);
+ p2 = invrframexform(flatten(c, p), imgrframe);
+ return (Point){p2.x, p2.y};+}
+
+Point2
+fromviewport(Camera *c, Point p)
+{+ imgrframe.p = Pt2(c->viewport->r.min.x, c->viewport->r.max.y, 1);
+ return rframexform(Pt2(p.x, p.y, 1), imgrframe);
+}
+
+void
+line3(Camera *c, Point3 p0, Point3 p1, int end0, int end1, Image *src)
+{+ p0 = WORLD2NDC(c, p0);
+ p1 = WORLD2NDC(c, p1);
+ if(isclipping(p0) || isclipping(p1))
+ return;
+ line(c->viewport, toviewport(c, p0), toviewport(c, p1), end0, end1, 0, src, ZP);
+}
+
+Point
+string3(Camera *c, Point3 p, Image *src, Font *f, char *s)
+{+ p = WORLD2NDC(c, p);
+ if(isclipping(p))
+ return (Point){~0, ~0};+ return string(c->viewport, toviewport(c, p), src, ZP, f, s);
+}
--- /dev/null
+++ b/libgraphics/triangle.c
@@ -1,0 +1,43 @@
+#include <u.h>
+#include <libc.h>
+#include <draw.h>
+#include "../geometry.h"
+#include "../graphics.h"
+
+Triangle
+Trian(int x0, int y0, int x1, int y1, int x2, int y2)
+{+ return (Triangle){Pt(x0, y0), Pt(x1, y1), Pt(x2, y2)};+}
+
+Triangle
+Trianpt(Point p0, Point p1, Point p2)
+{+ return (Triangle){p0, p1, p2};+}
+
+void
+triangle(Image *dst, Triangle t, int thick, Image *src, Point sp)
+{+ Point pl[4];
+
+ pl[0] = t.p0;
+ pl[1] = t.p1;
+ pl[2] = t.p2;
+ pl[3] = pl[0];
+
+ poly(dst, pl, nelem(pl), 0, 0, thick, src, sp);
+}
+
+void
+filltriangle(Image *dst, Triangle t, Image *src, Point sp)
+{+ Point pl[4];
+
+ pl[0] = t.p0;
+ pl[1] = t.p1;
+ pl[2] = t.p2;
+ pl[3] = pl[0];
+
+ fillpoly(dst, pl, nelem(pl), 0, src, sp);
+}
--- /dev/null
+++ b/libobj/examples/box.obj
@@ -1,0 +1,30 @@
+# Vertices: 8
+# Points: 0
+# Lines: 0
+# Faces: 6
+# Materials: 1
+
+o 1
+
+# Vertex list
+
+v -0.5 -0.5 0.5
+v -0.5 -0.5 -0.5
+v -0.5 0.5 -0.5
+v -0.5 0.5 0.5
+v 0.5 -0.5 0.5
+v 0.5 -0.5 -0.5
+v 0.5 0.5 -0.5
+v 0.5 0.5 0.5
+
+# Point/Line/Face list
+
+usemtl Default
+f 4 3 2 1
+f 2 6 5 1
+f 3 7 6 2
+f 8 7 3 4
+f 5 8 4 1
+f 6 7 8 5
+
+# End of file
--- /dev/null
+++ b/libobj/examples/cube.obj
@@ -1,0 +1,16 @@
+# This is a cube that measures two units on each side. Each vertex is
+# shared by three different faces.
+v 0.000000 2.000000 2.000000
+v 0.000000 0.000000 2.000000
+v 2.000000 0.000000 2.000000
+v 2.000000 2.000000 2.000000
+v 0.000000 2.000000 0.000000
+v 0.000000 0.000000 0.000000
+v 2.000000 0.000000 0.000000
+v 2.000000 2.000000 0.000000
+f 1 2 3 4
+f 8 7 6 5
+f 4 3 7 8
+f 5 1 4 8
+f 5 6 2 1
+f 2 6 7 3
--- /dev/null
+++ b/libobj/examples/diamond.obj
@@ -1,0 +1,20 @@
+# diamond.obj
+
+g Object001
+
+v 0.000000E+00 0.000000E+00 78.0000
+v 45.0000 45.0000 0.000000E+00
+v 45.0000 -45.0000 0.000000E+00
+v -45.0000 -45.0000 0.000000E+00
+v -45.0000 45.0000 0.000000E+00
+v 0.000000E+00 0.000000E+00 -78.0000
+
+f 1 2 3
+f 1 3 4
+f 1 4 5
+f 1 5 2
+f 6 5 4
+f 6 4 3
+f 6 3 2
+f 6 2 1
+f 6 1 5
--- /dev/null
+++ b/libobj/examples/lamp.obj
@@ -1,0 +1,8863 @@
+# Viewpoint Datalabs International, Inc. Copyright 1996
+
+
+mtllib ./vp.mtl
+
+g
+v 0.000000 8.407028 0.000000
+v 0.000000 8.380042 -0.204985
+v 0.053054 8.380042 -0.198000
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+f 3350 3295 3294 3349
+f 3354 3299 3298 3353
+f 3358 3303 3302 3357
+f 3362 3307 3306 3361
+f 3366 3311 3310 3365
+f 3370 3315 3314 3369
+f 3411 3320 3319 3410
+f 3414 3415 3324 3323
+f 3418 3419 3375 3328 3327 3374
+f 3422 3423 3379 3332 3331 3378
+f 3426 3427 3336 3335
+f 3430 3431 3380 3340 3339
+f 3434 3435 3344 3343
+f 3385 3349 3348 3384
+f 3389 3353 3352 3388
+f 3393 3357 3356 3392
+f 3397 3361 3360 3396
+f 3401 3365 3364 3400
+f 3405 3369 3368 3404
+f 3409 3373 3372 3408
+f 3442 3387 3386 3441
+f 3446 3391 3390 3445
+f 3450 3395 3394 3449
+f 3454 3399 3398 3453
+f 3458 3403 3402 3457
+f 3462 3407 3406 3461
+f 3495 3496 3412 3411
+f 3499 3500 3416 3415
+f 3503 3504 3420 3419
+f 3507 3508 3424 3423
+f 3511 3512 3428 3427
+f 3515 3516 3432 3431 3465
+f 3519 3520 3436 3435
+f 3470 3441 3440 3469
+f 3474 3445 3444 3473
+f 3478 3449 3448 3477
+f 3482 3453 3452 3481
+f 3486 3457 3456 3485
+f 3490 3461 3460 3489
+f 3523 3468 3467 3522
+f 3527 3472 3471 3526
+f 3531 3476 3475 3530
+f 3535 3480 3479 3534
+f 3539 3484 3483 3538
+f 3543 3488 3487 3542
+f 3547 3492 3491 3546
+f 3579 3580 3497 3496
+f 3583 3584 3501 3500
+f 3587 3588 3505 3504
+f 3591 3592 3509 3508
+f 3595 3596 3513 3512
+f 3599 3600 3517 3516 3549
+f 3603 3604 3521 3520
+f 3554 3526 3525 3553
+f 3558 3530 3529 3557
+f 3562 3534 3533 3561
+f 3566 3538 3537 3565
+f 3570 3542 3541 3569
+f 3574 3546 3545 3573
+f 3607 3552 3551 3606
+f 3611 3556 3555 3610
+f 3615 3560 3559 3614
+f 3619 3564 3563 3618
+f 3623 3568 3567 3622
+f 3627 3572 3571 3626
+f 3631 3576 3575 3630
+f 3665 3666 3581 3580
+f 3669 3670 3632 3585 3584
+f 3673 3674 3589 3588
+f 3677 3678 3593 3592
+f 3681 3682 3633 3597 3596
+f 3685 3686 3601 3600
+f 3636 3606 3605 3635
+f 3640 3610 3609 3639
+f 3644 3614 3613 3643
+f 3648 3618 3617 3647
+f 3652 3622 3621 3651
+f 3656 3626 3625 3655
+f 3660 3630 3629 3659
+f 3693 3638 3637 3692
+f 3697 3642 3641 3696
+f 3701 3646 3645 3700
+f 3705 3650 3649 3704
+f 3709 3654 3653 3708
+f 3713 3658 3657 3712
+f 3745 3663 3662 3744
+f 3748 3749 3667 3666
+f 3752 3753 3671 3670
+f 3756 3757 3675 3674
+f 3760 3761 3679 3678
+f 3764 3765 3683 3682
+f 3768 3769 3687 3686
+f 3719 3692 3691 3718
+f 3723 3696 3695 3722
+f 3727 3700 3699 3726
+f 3731 3704 3703 3730
+f 3735 3708 3707 3734
+f 3739 3712 3711 3738
+f 3743 3716 3715 3742
+f 3776 3721 3720 3775
+f 3780 3725 3724 3779
+f 3784 3729 3728 3783
+f 3788 3733 3732 3787
+f 3792 3737 3736 3791
+f 3796 3741 3740 3795
+f 3829 3830 3746 3745
+f 3833 3834 3750 3749
+f 3837 3838 3754 3753
+f 3841 3842 3758 3757
+f 3845 3846 3762 3761
+f 3849 3850 3799 3766 3765
+f 3853 3854 3770 3769
+f 3804 3775 3774 3803
+f 3808 3779 3778 3807
+f 3812 3783 3782 3811
+f 3816 3787 3786 3815
+f 3820 3791 3790 3819
+f 3824 3795 3794 3823
+f 3857 3802 3801 3856
+f 3861 3806 3805 3860
+f 3865 3810 3809 3864
+f 3869 3814 3813 3868
+f 3873 3818 3817 3872
+f 3877 3822 3821 3876
+f 3881 3826 3825 3880
+f 3930 3931 3831 3830
+f 3934 3935 3885 3835 3834
+f 3938 3939 3888 3839 3838
+f 3942 3943 3843 3842 3891
+f 3946 3947 3893 3847 3846
+f 3950 3951 3897 3851 3850 3896
+f 3954 3955 3900 3855 3854
+f 3905 3860 3859 3904
+f 3909 3864 3863 3908
+f 3913 3868 3867 3912
+f 3917 3872 3871 3916
+f 3921 3876 3875 3920
+f 3925 3880 3879 3924
+f 3958 3903 3902 3957
+f 3962 3907 3906 3961
+f 3966 3911 3910 3965
+f 3970 3915 3914 3969
+f 3974 3919 3918 3973
+f 3978 3923 3922 3977
+f 3982 3927 3926 3981
+f 2973 2972 3932 3931
+f 2969 2968 3936 3935
+f 2965 2964 3940 3939
+f 2961 2960 3944 3943
+f 2957 2956 3948 3947
+f 2953 2952 3952 3951
+f 3002 3957 3956 3003
+f 2998 3961 3960 2999
+f 2994 3965 3964 2995
+f 2990 3969 3968 2991
+f 2986 3973 3972 2987
+f 2982 3977 3976 2983
+f 2978 3981 3980 2979
+f 2977 3030 4001 4000
+f 3997 4004 4005 3996
+f 4372 4371 3992 3993
+f 4440 4012 4024 4025 3989
+f 3986 4028 4029 3985
+f 4002 4014 4015 4003
+f 4006 4018 4019 4007
+f 4010 4022 4023 4011
+f 4014 4031 4032 4015
+f 4351 4035 4036 4369
+f 4363 4039 4040 4360
+f 4026 4055 4056 4027
+f 3115 3149 4042 4030
+f 4033 4045 4046 4034
+f 4037 4049 4050 4038
+f 3149 3204 4059 4042
+f 4045 4062 4063 4046
+f 4365 4367 4050 4049
+f 4053 4070 4085 4086 4054
+f 4057 4072 4089 4090 4073 4058
+f 4060 4075 4076 4061
+f 4064 4079 4080 4065
+f 4068 4083 4084 4069
+f 4075 4092 4093 4076
+f 4349 4096 4097 4348
+f 4345 4100 4101 4344
+f 4087 4103 4119 4120 4104 4088
+f 3290 3318 4106 4091
+f 4094 4109 4110 4095
+f 4098 4113 4114 4099
+f 3318 3373 4123 4106
+f 4109 4126 4127 4110
+f 4355 4356 4114 4113
+f 4117 4134 4147 4148 4118
+f 4121 4151 4152 4122
+f 4124 4137 4138 4125
+f 4128 4141 4142 4129
+f 4132 4145 4146 4133
+f 4137 4154 4155 4138
+f 4415 4158 4159 4414
+f 4411 4162 4163 4410
+f 4149 4179 4180 4150
+f 3464 3493 4166 4153
+f 4156 4169 4170 4157
+f 4160 4173 4174 4161
+f 3493 3548 4183 4166
+f 4169 4186 4187 4170
+f 4408 4190 4191 4407
+f 4177 4194 4206 4207 4178
+f 4181 4210 4211 4182
+f 4184 4196 4197 4185
+f 4188 4200 4201 4189
+f 4192 4204 4205 4193
+f 4196 4213 4214 4197
+f 4393 4400 4201 4200
+f 4403 4404 4205 4204
+f 4208 4237 4238 4209
+f 3631 3661 4224 4212
+f 4215 4227 4228 4216
+f 4219 4231 4232 4220
+f 3661 3716 4241 4224
+f 4227 4244 4245 4228
+f 4398 4248 4249 4397
+f 4235 4252 4265 4266 4236
+f 4239 4253 4269 4270 4240
+f 4242 4255 4256 4243
+f 4246 4259 4260 4247
+f 4250 4263 4264 4251
+f 4255 4272 4273 4256
+f 4391 4276 4277 4380
+f 4377 4280 4281 4376
+f 4267 4283 4297 4298 4268
+f 3798 3827 4284 4271
+f 4274 4287 4288 4275
+f 4278 4291 4292 4279
+f 3827 3882 4301 4284
+f 4287 4304 4305 4288
+f 4382 4383 4292 4291
+f 4295 4312 4325 4326 4296
+f 4299 4329 4330 4313 4300
+f 4302 4315 4316 4303
+f 4306 4319 4320 4307
+f 4310 4323 4324 4311
+f 4315 4332 4333 4316
+f 4389 4336 4337 4388
+f 4385 4340 4341 4374
+f 4327 3988 3987 4328
+f 3982 2977 4000 4331
+f 4334 3997 3996 4335
+f 4338 3993 3992 4339
+f 4415 4414 4142 4141
+f 4411 4410 4146 4145
+f 4407 4406 4175 4174
+f 4356 4355 4130 4131
+f 4348 4347 4081 4080
+f 4359 4364 4068 4069
+f 4366 4350 4064 4065
+f 4368 4363 4022 4021
+f 4371 4372 4008 4009
+f 4388 4387 4321 4320
+f 4375 4384 4310 4311
+f 4381 4390 4306 4307
+f 4378 4377 4263 4262
+f 4398 4397 4232 4231
+f 4403 4402 4220 4221
+f 4084 4085 4416 4417
+f 4040 4052 4419
+f 4024 4012 4420
+f 4206 4194 4424
+f 4264 4265 4428 4429
+f 4281 4294 4431
+f 4325 4312 4432
+f 4146 4147 4436 4437
+f 4101 4116 4439
+# 4404 elements
--- /dev/null
+++ b/libobj/examples/negcube.obj
@@ -1,0 +1,33 @@
+# This is a cube with negative vertex reference numbers. Each element
+# references the vertices stored immediately above it in the file.
+# Note that vertices are not shared.
+v 0.000000 2.000000 2.000000
+v 0.000000 0.000000 2.000000
+v 2.000000 0.000000 2.000000
+v 2.000000 2.000000 2.000000
+f -4 -3 -2 -1
+v 2.000000 2.000000 0.000000
+v 2.000000 0.000000 0.000000
+v 0.000000 0.000000 0.000000
+v 0.000000 2.000000 0.000000
+f -4 -3 -2 -1
+v 2.000000 2.000000 2.000000
+v 2.000000 0.000000 2.000000
+v 2.000000 0.000000 0.000000
+v 2.000000 2.000000 0.000000
+f -4 -3 -2 -1
+v 0.000000 2.000000 0.000000
+v 0.000000 2.000000 2.000000
+v 2.000000 2.000000 2.000000
+v 2.000000 2.000000 0.000000
+f -4 -3 -2 -1
+v 0.000000 2.000000 0.000000
+v 0.000000 0.000000 0.000000
+v 0.000000 0.000000 2.000000
+v 0.000000 2.000000 2.000000
+f -4 -3 -2 -1
+v 0.000000 0.000000 2.000000
+v 0.000000 0.000000 0.000000
+v 2.000000 0.000000 0.000000
+v 2.000000 0.000000 2.000000
+f -4 -3 -2 -1
--- /dev/null
+++ b/libobj/examples/square.obj
@@ -1,0 +1,9 @@
+# This example shows a square that measures two units on each side and
+# faces in the positive direction (toward the camera). Note that the
+# ordering of the vertices is counterclockwise. This ordering
+# determines that the square is facing forward.
+v 0.000000 2.000000 0.000000
+v 0.000000 0.000000 0.000000
+v 2.000000 0.000000 0.000000
+v 2.000000 2.000000 0.000000
+f 1 2 3 4
--- /dev/null
+++ b/libobj/mkfile
@@ -1,0 +1,9 @@
+</$objtype/mkfile
+
+LIB=../libobj.a$O
+OFILES=\
+ obj.$O\
+
+HFILES=../obj.h
+
+</sys/src/cmd/mklib
--- /dev/null
+++ b/libobj/obj.2.man
@@ -1,0 +1,88 @@
+.TH OBJ 2
+.SH NAME
+objparse,
+objfree,
+OBJfmt,
+OBJfmtinstall
+\- OBJ parser
+.SH SYNOPSIS
+.ta 0.7i +0.7i +0.7i +0.7i +0.7i +0.7i +0.7i
+.EX
+#include <u.h>
+#include <libc.h>
+#include <obj.h>
+
+enum {+ OBJVGeometric,
+ OBJVTexture,
+ OBJVNormal,
+ OBJVParametric,
+ OBJNVERT
+};
+
+enum {+ OBJEPoint,
+ OBJELine,
+ OBJEFace,
+ OBJECurve,
+ OBJECurve2,
+ OBJESurface
+};
+
+enum {+ OBJHTSIZE = 17
+};
+
+typedef struct
+{+ union {+ struct { double x, y, z, w; }; /* geometric */+ struct { double u, v, vv; }; /* texture and parametric */+ struct { double i, j, k; }; /* normal */+ };
+} OBJVertex;
+
+typedef struct
+{+ OBJVertex *verts;
+ int nvert;
+} OBJVertexArray;
+
+typedef struct
+{+ int *indices;
+ int nindex;
+ int type;
+ OBJElem *next;
+} OBJElem;
+
+typedef struct
+{+ char *name;
+ OBJElem *child;
+ OBJObject *next;
+} OBJObject;
+
+typedef struct
+{+ OBJVertexArray vertdata[OBJNVERT];
+ OBJObject *objtab[OBJHTSIZE];
+} OBJ;
+
+OBJ *objparse(char *file);
+void objfree(OBJ *obj);
+int OBJfmt(Fmt*);
+void OBJfmtinstall(void);
+.EE
+.SH DESCRIPTION
+An OBJ structure contains geometry and material information about a set of 3D objects
+.SH SOURCE
+.B /sys/src/libobj
+.SH SEE ALSO
+.IR geometry (2)
+.br
+http://paulbourke.net/dataformats/obj
+.br
+https://people.sc.fsu.edu/~jburkardt/data/obj/obj.html
+.SH DIAGNOSTICS
+.SH BUGS
--- /dev/null
+++ b/libobj/obj.c
@@ -1,0 +1,584 @@
+#include <u.h>
+#include <libc.h>
+#include <ctype.h>
+#include <bio.h>
+#include "../obj.h"
+
+#undef isspace(c)
+#define isspace(c) ((c) == ' ' || (c) == '\t')
+
+typedef struct Line Line;
+struct Line
+{+ char *file;
+ ulong lineno;
+};
+
+static Line curline;
+
+static void
+error(char *fmt, ...)
+{+ va_list va;
+ char buf[ERRMAX], *bp;
+
+ va_start(va, fmt);
+ bp = seprint(buf, buf + sizeof buf, "%s:%lud ", curline.file, curline.lineno);
+ vseprint(bp, buf + sizeof buf, fmt, va);
+ va_end(va);
+ werrstr("%s\n", buf);+}
+
+static void *
+emalloc(ulong n)
+{+ void *p;
+
+ p = malloc(n);
+ if(p == nil)
+ sysfatal("malloc: %r");+ memset(p, 0, n);
+ setmalloctag(p, getcallerpc(&n));
+ return p;
+}
+
+static void *
+erealloc(void *v, ulong n)
+{+ void *nv;
+
+ nv = realloc(v, n);
+ if(nv == nil)
+ sysfatal("realloc: %r");+ setrealloctag(nv, getcallerpc(&v));
+ return nv;
+}
+
+static uint
+hash(char *s)
+{+ uint h;
+
+ h = 0x811c9dc5;
+ while(*s != 0)
+ h = (h^(uchar)*s++) * 0x1000193;
+ return h % OBJHTSIZE;
+}
+
+static void
+addvertva(OBJVertexArray *va, OBJVertex v)
+{+ va->verts = erealloc(va->verts, ++va->nvert*sizeof(OBJVertex));
+ va->verts[va->nvert-1] = v;
+}
+
+static void
+addvert(OBJ *obj, OBJVertex v, int vtype)
+{+ addvertva(&obj->vertdata[vtype], v);
+}
+
+static void
+addelem(OBJObject *o, OBJElem *e)
+{+ OBJElem *ep;
+
+ if(o->child == nil){+ o->child = e;
+ return;
+ }
+ for(ep = o->child; ep->next != nil; ep = ep->next)
+ ;
+ ep->next = e;
+}
+
+static OBJElem *
+allocelem(int t)
+{+ OBJElem *e;
+
+ e = emalloc(sizeof(OBJElem));
+ e->type = t;
+ return e;
+}
+
+static void
+addelemidx(OBJElem *e, int idx)
+{+ e->indices = erealloc(e->indices, ++e->nindex*sizeof(int));
+ e->indices[e->nindex-1] = idx;
+}
+
+static void
+freeelem(OBJElem *e)
+{+ free(e->indices);
+ free(e);
+}
+
+static OBJObject *
+alloco(char *n)
+{+ OBJObject *o;
+
+ o = emalloc(sizeof(OBJObject));
+ o->name = strdup(n);
+ return o;
+}
+
+static void
+freeo(OBJObject *o)
+{+ OBJElem *e, *ne;
+
+ free(o->name);
+ for(e = o->child; e != nil; e = ne){+ ne = e->next;
+ freeelem(e);
+ }
+ free(o);
+}
+
+static void
+pusho(OBJ *obj, OBJObject *o)
+{+ OBJObject *op, *prev;
+ uint h;
+
+ prev = nil;
+ h = hash(o->name);
+ for(op = obj->objtab[h]; op != nil; prev = op, op = op->next)
+ if(strcmp(op->name, o->name) == 0){+ o->next = op->next;
+ freeo(op);
+ break;
+ }
+ if(prev == nil){+ obj->objtab[h] = o;
+ return;
+ }
+ prev->next = o;
+}
+
+static OBJObject *
+geto(OBJ *obj, char *n)
+{+ OBJObject *o;
+ uint h;
+
+ h = hash(n);
+ for(o = obj->objtab[h]; o != nil; o = o->next)
+ if(strcmp(o->name, n) == 0)
+ break;
+ return o;
+}
+
+OBJ *
+objparse(char *file)
+{+ Biobuf *bin;
+ OBJ *obj;
+ OBJObject *o;
+ OBJElem *e;
+ OBJVertex v;
+ double *d;
+ char c, buf[256], *p;
+ int vtype, idx, sign;
+
+ o = nil;
+ bin = Bopen(file, OREAD);
+ if(bin == nil)
+ sysfatal("Bopen: %r");+ curline.file = file;
+ curline.lineno = 1;
+ obj = emalloc(sizeof(OBJ));
+ while((c = Bgetc(bin)) != Beof){+ switch(c){+ case 'v':
+ d = (double*)&v;
+ c = Bgetc(bin);
+ vtype = OBJVGeometric;
+ switch(c){+ case 't': vtype = OBJVTexture; break;
+ case 'p': vtype = OBJVParametric; break;
+ case 'n': vtype = OBJVNormal; break;
+ default:
+ if(!isspace(c)){+ error("wrong vertex type");+ goto error;
+ }
+ }
+ while(c = Bgetc(bin), c != Beof && c != '\n' && d-(double*)&v < 4){+ while(isspace(c))
+ c = Bgetc(bin);
+ if(c == '\\'){+ while(c != '\n')
+ c = Bgetc(bin);
+ continue;
+ }
+ if(c != '-' && !isdigit(c)){+ error("unexpected character '%c'", c);+ goto error;
+ }
+ Bungetc(bin);
+ Bgetd(bin, d++);
+ }
+ switch(vtype){+ case OBJVGeometric:
+ if(d-(double*)&v < 3){+ error("not enough coordinates");+ goto error;
+ }
+ if(d-(double*)&v < 4)
+ *d = 1; /* default w value */
+ break;
+ case OBJVTexture:
+ if(d-(double*)&v < 1){+ error("not enough coordinates");+ goto error;
+ }
+ while(d-(double*)&v < 3)
+ *d++ = 0; /* default v and w values */
+ break;
+ case OBJVParametric:
+ if(d-(double*)&v < 2){+ error("not enough coordinates");+ goto error;
+ }
+ if(d-(double*)&v < 3)
+ *d = 1; /* default w value */
+ break;
+ case OBJVNormal:
+ if(d-(double*)&v < 3){+ error("not enough coordinates");+ goto error;
+ }
+ }
+ addvert(obj, v, vtype);
+ break;
+ case 'o':
+ p = buf;
+ c = Bgetc(bin);
+ if(!isspace(c)){+ error("syntax error");+ goto error;
+ }
+ while(isspace(c))
+ c = Bgetc(bin);
+ if(!isalnum(c)){+ error("unexpected character '%c'", c);+ goto error;
+ }
+ do{+ *p++ = c;
+ }while(c = Bgetc(bin), isalnum(c) && p-buf < sizeof(buf)-1);
+ *p = 0;
+ o = geto(obj, buf);
+ if(o == nil){+ o = alloco(buf);
+ pusho(obj, o);
+ }
+ break;
+ case 'g':
+ case 's':
+ /* element and smoothing groups ignored for now */
+ while(c != '\n')
+ c = Bgetc(bin);
+ break;
+ case 'p':
+ c = Bgetc(bin);
+ if(!isspace(c)){+ error("syntax error");+ goto error;
+ }
+ while(c = Bgetc(bin), c != '\n'){+ idx = 0;
+ sign = 0;
+ while(isspace(c))
+ c = Bgetc(bin);
+ if(c == '\\'){+ while(c != '\n')
+ c = Bgetc(bin);
+ continue;
+ }
+ if(c != '-' && !isdigit(c)){+ error("unexpected character '%c'", c);+ goto error;
+ }
+ if(c == '-'){+ sign = 1;
+ c = Bgetc(bin);
+ if(!isdigit(c)){+ error("unexpected character '%c'", c);+ goto error;
+ }
+ }
+ do{+ idx = idx*10 + c-'0';
+ }while(c = Bgetc(bin), isdigit(c));
+ Bungetc(bin);
+ idx = sign ? obj->vertdata[OBJVGeometric].nvert-idx : idx-1;
+ if(idx+1 > obj->vertdata[OBJVGeometric].nvert){+ error("not enough vertices");+ goto error;
+ }
+ e = allocelem(OBJEPoint);
+ addelemidx(e, idx);
+ if(o == nil){+ o = alloco("default");+ pusho(obj, o);
+ }
+ addelem(o, e);
+ }
+ break;
+ case 'l':
+ c = Bgetc(bin);
+ if(!isspace(c)){+ error("syntax error");+ goto error;
+ }
+ while(c = Bgetc(bin), c != '\n'){+ idx = 0;
+ sign = 0;
+ while(isspace(c))
+ c = Bgetc(bin);
+ if(c == '\\'){+ while(c != '\n')
+ c = Bgetc(bin);
+ continue;
+ }
+ if(c != '-' && !isdigit(c)){+ error("unexpected character '%c'", c);+ goto error;
+ }
+ if(c == '-'){+ sign = 1;
+ c = Bgetc(bin);
+ if(!isdigit(c)){+ error("unexpected character '%c'", c);+ goto error;
+ }
+ }
+ do{+ idx = idx*10 + c-'0';
+ }while(c = Bgetc(bin), isdigit(c));
+ idx = sign ? obj->vertdata[OBJVGeometric].nvert-idx : idx-1;
+ if(idx+1 > obj->vertdata[OBJVGeometric].nvert){+ error("not enough vertices");+ goto error;
+ }
+ e = allocelem(OBJELine);
+ addelemidx(e, idx);
+Line2:
+ idx = 0;
+ sign = 0;
+ while(isspace(c))
+ c = Bgetc(bin);
+ if(c == '\\'){+ while(c != '\n')
+ c = Bgetc(bin);
+ c = Bgetc(bin);
+ goto Line2;
+ }
+ if(c != '-' && !isdigit(c)){+ freeelem(e);
+ error("unexpected character '%c'", c);+ goto error;
+ }
+ if(c == '-'){+ sign = 1;
+ c = Bgetc(bin);
+ if(!isdigit(c)){+ freeelem(e);
+ error("unexpected character '%c'", c);+ goto error;
+ }
+ }
+ do{+ idx = idx*10 + c-'0';
+ }while(c = Bgetc(bin), isdigit(c));
+ Bungetc(bin);
+ idx = sign ? obj->vertdata[OBJVGeometric].nvert-idx : idx-1;
+ if(idx+1 > obj->vertdata[OBJVGeometric].nvert){+ freeelem(e);
+ error("not enough vertices");+ goto error;
+ }
+ addelemidx(e, idx);
+ if(o == nil){+ o = alloco("default");+ pusho(obj, o);
+ }
+ addelem(o, e);
+ }
+ break;
+ case 'f':
+ e = allocelem(OBJEFace);
+ c = Bgetc(bin);
+ if(!isspace(c)){+ freeelem(e);
+ error("syntax error");+ goto error;
+ }
+ while(c = Bgetc(bin), c != '\n'){+ idx = 0;
+ sign = 0;
+ while(isspace(c))
+ c = Bgetc(bin);
+ if(c == '\\'){+ while(c != '\n')
+ c = Bgetc(bin);
+ continue;
+ }
+ if(c != '-' && !isdigit(c)){+ freeelem(e);
+ error("unexpected character '%c'", c);+ goto error;
+ }
+ if(c == '-'){+ sign = 1;
+ c = Bgetc(bin);
+ if(!isdigit(c)){+ freeelem(e);
+ error("unexpected character '%c'", c);+ goto error;
+ }
+ }
+ do{+ idx = idx*10 + c-'0';
+ }while(c = Bgetc(bin), isdigit(c));
+ Bungetc(bin);
+ idx = sign ? obj->vertdata[OBJVGeometric].nvert-idx : idx-1;
+ if(idx+1 > obj->vertdata[OBJVGeometric].nvert){+ freeelem(e);
+ error("not enough vertices");+ goto error;
+ }
+ addelemidx(e, idx);
+ }
+ if(o == nil){+ o = alloco("default");+ pusho(obj, o);
+ }
+ addelem(o, e);
+ break;
+ case 'm':
+ case 'u':
+ p = buf;
+ do{+ *p++ = c;
+ }while(c = Bgetc(bin), isalpha(c) && p-buf < sizeof(buf)-1);
+ *p = 0;
+ if(strcmp(buf, "mtllib") != 0 && strcmp(buf, "usemtl") != 0){+ error("syntax error");+ goto error;
+ }
+ while(c != '\n')
+ c = Bgetc(bin);
+ break;
+ case '#':
+ while(c != '\n')
+ c = Bgetc(bin);
+ break;
+ }
+ do{+ if(c == '\n'){+ curline.lineno++;
+ break;
+ }
+ if(!isspace(c)){+ error("syntax error");+ goto error;
+ }
+ }while((c = Bgetc(bin)) != Beof);
+ }
+ Bterm(bin);
+ return obj;
+error:
+ objfree(obj);
+ Bterm(bin);
+ return nil;
+}
+
+void
+objfree(OBJ *obj)
+{+ OBJObject *o, *no;
+ int i;
+
+ if(obj == nil)
+ return;
+ for(i = 0; i < nelem(obj->vertdata); i++)
+ free(obj->vertdata[i].verts);
+ for(i = 0; i < nelem(obj->objtab); i++)
+ for(o = obj->objtab[i]; o != nil; o = no){+ no = o->next;
+ freeo(o);
+ }
+ free(obj);
+}
+
+int
+OBJfmt(Fmt *f)
+{+ OBJ *obj;
+ OBJObject *o;
+ OBJElem *e;
+ OBJVertex v;
+ int i, j, r, pack;
+
+ r = pack = 0;
+ obj = va_arg(f->args, OBJ*);
+ for(i = 0; i < nelem(obj->vertdata); i++)
+ for(j = 0; j < obj->vertdata[i].nvert; j++){+ v = obj->vertdata[i].verts[j];
+ switch(i){+ case OBJVGeometric:
+ r += fmtprint(f, "v %g %g %g %g\n", v.x, v.y, v.z, v.w);
+ break;
+ case OBJVTexture:
+ r += fmtprint(f, "vt %g %g %g\n", v.u, v.v, v.vv);
+ break;
+ case OBJVNormal:
+ r += fmtprint(f, "vn %g %g %g\n", v.i, v.j, v.k);
+ break;
+ case OBJVParametric:
+ r += fmtprint(f, "vp %g %g %g\n", v.u, v.v, v.vv);
+ break;
+ }
+ }
+ for(i = 0; i < nelem(obj->objtab); i++)
+ for(o = obj->objtab[i]; o != nil; o = o->next){+ if(strcmp(o->name, "default") != 0)
+ r += fmtprint(f, "o %s\n", o->name);
+ for(e = o->child; e != nil; e = e->next){+ switch(e->type){+ case OBJEPoint:
+ if(pack == 0)
+ r += fmtprint(f, "p");
+ pack = pack > 0 ? --pack : 8-1;
+ break;
+ case OBJELine:
+ r += fmtprint(f, "l");
+ break;
+ case OBJEFace:
+ r += fmtprint(f, "f");
+ break;
+ //case OBJECurve:
+ //case OBJECurve2:
+ //case OBJESurface:
+ }
+ for(j = 0; j < e->nindex; j++)
+ r += fmtprint(f, " %d", e->indices[j]+1);
+ if(e->type != OBJEPoint || pack == 0)
+ r += fmtprint(f, "\n");
+ }
+ }
+ return r;
+}
+
+void
+OBJfmtinstall(void)
+{+ fmtinstall('O', OBJfmt);+}
--- /dev/null
+++ b/libobj/spec
@@ -1,0 +1,2 @@
+http://paulbourke.net/dataformats/obj
+https://people.sc.fsu.edu/~jburkardt/data/obj/obj.html
--- /dev/null
+++ b/libobj/test/main.acid
@@ -1,0 +1,525 @@
+sizeof_1_ = 8;
+aggr _1_
+{+ 'U' 0 lo;
+ 'U' 4 hi;
+};
+
+defn
+_1_(addr) {+ complex _1_ addr;
+ print(" lo ", addr.lo, "\n");+ print(" hi ", addr.hi, "\n");+};
+
+sizeofFPdbleword = 8;
+aggr FPdbleword
+{+ 'F' 0 x;
+ {+ 'U' 0 lo;
+ 'U' 4 hi;
+ };
+};
+
+defn
+FPdbleword(addr) {+ complex FPdbleword addr;
+ print(" x ", addr.x, "\n");+ print("_1_ {\n");+ _1_(addr+0);
+ print("}\n");+};
+
+UTFmax = 4;
+Runesync = 128;
+Runeself = 128;
+Runeerror = 65533;
+Runemax = 1114111;
+Runemask = 2097151;
+sizeofFmt = 80;
+aggr Fmt
+{+ 'b' 0 runes;
+ 'Y' 8 start;
+ 'Y' 16 to;
+ 'Y' 24 stop;
+ 'Y' 32 flush;
+ 'Y' 40 farg;
+ 'D' 48 nfmt;
+ 'Y' 56 args;
+ 'D' 64 r;
+ 'D' 68 width;
+ 'D' 72 prec;
+ 'U' 76 flags;
+};
+
+defn
+Fmt(addr) {+ complex Fmt addr;
+ print(" runes ", addr.runes, "\n");+ print(" start ", addr.start\Y, "\n");+ print(" to ", addr.to\Y, "\n");+ print(" stop ", addr.stop\Y, "\n");+ print(" flush ", addr.flush\Y, "\n");+ print(" farg ", addr.farg\Y, "\n");+ print(" nfmt ", addr.nfmt, "\n");+ print(" args ", addr.args\Y, "\n");+ print(" r ", addr.r, "\n");+ print(" width ", addr.width, "\n");+ print(" prec ", addr.prec, "\n");+ print(" flags ", addr.flags, "\n");+};
+
+FmtWidth = 1;
+FmtLeft = 2;
+FmtPrec = 4;
+FmtSharp = 8;
+FmtSpace = 16;
+FmtSign = 32;
+FmtZero = 64;
+FmtUnsigned = 128;
+FmtShort = 256;
+FmtLong = 512;
+FmtVLong = 1024;
+FmtComma = 2048;
+FmtByte = 4096;
+FmtFlag = 8192;
+sizeofTm = 40;
+aggr Tm
+{+ 'D' 0 sec;
+ 'D' 4 min;
+ 'D' 8 hour;
+ 'D' 12 mday;
+ 'D' 16 mon;
+ 'D' 20 year;
+ 'D' 24 wday;
+ 'D' 28 yday;
+ 'a' 32 zone;
+ 'D' 36 tzoff;
+};
+
+defn
+Tm(addr) {+ complex Tm addr;
+ print(" sec ", addr.sec, "\n");+ print(" min ", addr.min, "\n");+ print(" hour ", addr.hour, "\n");+ print(" mday ", addr.mday, "\n");+ print(" mon ", addr.mon, "\n");+ print(" year ", addr.year, "\n");+ print(" wday ", addr.wday, "\n");+ print(" yday ", addr.yday, "\n");+ print(" zone ", addr.zone, "\n");+ print(" tzoff ", addr.tzoff, "\n");+};
+
+PNPROC = 1;
+PNGROUP = 2;
+Profoff = 0;
+Profuser = 1;
+Profkernel = 2;
+Proftime = 3;
+Profsample = 4;
+sizeofLock = 8;
+aggr Lock
+{+ 'D' 0 val;
+};
+
+defn
+Lock(addr) {+ complex Lock addr;
+ print(" val ", addr.val, "\n");+};
+
+sizeofQLp = 16;
+aggr QLp
+{+ 'D' 0 inuse;
+ 'D' 4 state;
+ 'A' QLp 8 next;
+};
+
+defn
+QLp(addr) {+ complex QLp addr;
+ print(" inuse ", addr.inuse, "\n");+ print(" state ", addr.state, "\n");+ print(" next ", addr.next\Y, "\n");+};
+
+sizeofQLock = 32;
+aggr QLock
+{+ Lock 0 lock;
+ 'D' 8 locked;
+ 'A' QLp 16 $head;
+ 'A' QLp 24 $tail;
+};
+
+defn
+QLock(addr) {+ complex QLock addr;
+ print("Lock lock {\n");+ Lock(addr.lock);
+ print("}\n");+ print(" locked ", addr.locked, "\n");+ print(" $head ", addr.$head\Y, "\n");+ print(" $tail ", addr.$tail\Y, "\n");+};
+
+sizeofRWLock = 32;
+aggr RWLock
+{+ Lock 0 lock;
+ 'D' 8 readers;
+ 'D' 12 writer;
+ 'A' QLp 16 $head;
+ 'A' QLp 24 $tail;
+};
+
+defn
+RWLock(addr) {+ complex RWLock addr;
+ print("Lock lock {\n");+ Lock(addr.lock);
+ print("}\n");+ print(" readers ", addr.readers, "\n");+ print(" writer ", addr.writer, "\n");+ print(" $head ", addr.$head\Y, "\n");+ print(" $tail ", addr.$tail\Y, "\n");+};
+
+sizeofRendez = 24;
+aggr Rendez
+{+ 'A' QLock 0 l;
+ 'A' QLp 8 $head;
+ 'A' QLp 16 $tail;
+};
+
+defn
+Rendez(addr) {+ complex Rendez addr;
+ print(" l ", addr.l\Y, "\n");+ print(" $head ", addr.$head\Y, "\n");+ print(" $tail ", addr.$tail\Y, "\n");+};
+
+sizeofNetConnInfo = 72;
+aggr NetConnInfo
+{+ 'Y' 0 dir;
+ 'Y' 8 root;
+ 'Y' 16 spec;
+ 'Y' 24 lsys;
+ 'Y' 32 lserv;
+ 'Y' 40 rsys;
+ 'Y' 48 rserv;
+ 'Y' 56 laddr;
+ 'Y' 64 raddr;
+};
+
+defn
+NetConnInfo(addr) {+ complex NetConnInfo addr;
+ print(" dir ", addr.dir\Y, "\n");+ print(" root ", addr.root\Y, "\n");+ print(" spec ", addr.spec\Y, "\n");+ print(" lsys ", addr.lsys\Y, "\n");+ print(" lserv ", addr.lserv\Y, "\n");+ print(" rsys ", addr.rsys\Y, "\n");+ print(" rserv ", addr.rserv\Y, "\n");+ print(" laddr ", addr.laddr\Y, "\n");+ print(" raddr ", addr.raddr\Y, "\n");+};
+
+RFNAMEG = 1;
+RFENVG = 2;
+RFFDG = 4;
+RFNOTEG = 8;
+RFPROC = 16;
+RFMEM = 32;
+RFNOWAIT = 64;
+RFCNAMEG = 1024;
+RFCENVG = 2048;
+RFCFDG = 4096;
+RFREND = 8192;
+RFNOMNT = 16384;
+sizeofQid = 16;
+aggr Qid
+{+ 'W' 0 path;
+ 'U' 8 vers;
+ 'b' 12 type;
+};
+
+defn
+Qid(addr) {+ complex Qid addr;
+ print(" path ", addr.path, "\n");+ print(" vers ", addr.vers, "\n");+ print(" type ", addr.type, "\n");+};
+
+sizeofDir = 80;
+aggr Dir
+{+ 'u' 0 type;
+ 'U' 4 dev;
+ Qid 8 qid;
+ 'U' 24 mode;
+ 'U' 28 atime;
+ 'U' 32 mtime;
+ 'V' 40 length;
+ 'Y' 48 name;
+ 'Y' 56 uid;
+ 'Y' 64 gid;
+ 'Y' 72 muid;
+};
+
+defn
+Dir(addr) {+ complex Dir addr;
+ print(" type ", addr.type, "\n");+ print(" dev ", addr.dev, "\n");+ print("Qid qid {\n");+ Qid(addr.qid);
+ print("}\n");+ print(" mode ", addr.mode, "\n");+ print(" atime ", addr.atime, "\n");+ print(" mtime ", addr.mtime, "\n");+ print(" length ", addr.length, "\n");+ print(" name ", addr.name\Y, "\n");+ print(" uid ", addr.uid\Y, "\n");+ print(" gid ", addr.gid\Y, "\n");+ print(" muid ", addr.muid\Y, "\n");+};
+
+sizeofWaitmsg = 24;
+aggr Waitmsg
+{+ 'D' 0 pid;
+ 'a' 4 time;
+ 'Y' 16 msg;
+};
+
+defn
+Waitmsg(addr) {+ complex Waitmsg addr;
+ print(" pid ", addr.pid, "\n");+ print(" time ", addr.time, "\n");+ print(" msg ", addr.msg\Y, "\n");+};
+
+sizeofIOchunk = 16;
+aggr IOchunk
+{+ 'Y' 0 addr;
+ 'U' 8 len;
+};
+
+defn
+IOchunk(addr) {+ complex IOchunk addr;
+ print(" addr ", addr.addr\Y, "\n");+ print(" len ", addr.len, "\n");+};
+
+OBJVGeometric = 0;
+OBJVTexture = 1;
+OBJVNormal = 2;
+OBJVParametric = 3;
+OBJNVERT = 4;
+OBJEPoint = 0;
+OBJELine = 1;
+OBJEFace = 2;
+OBJECurve = 3;
+OBJECurve2 = 4;
+OBJESurface = 5;
+OBJGGlobal = 0;
+OBJGSmoothing = 1;
+OBJGMerging = 2;
+OBJGObject = 3;
+OBJHTSIZE = 16;
+sizeof_2_ = 32;
+aggr _2_
+{+ 'F' 0 x;
+ 'F' 8 y;
+ 'F' 16 z;
+ 'F' 24 w;
+};
+
+defn
+_2_(addr) {+ complex _2_ addr;
+ print(" x ", addr.x, "\n");+ print(" y ", addr.y, "\n");+ print(" z ", addr.z, "\n");+ print(" w ", addr.w, "\n");+};
+
+sizeof_3_ = 24;
+aggr _3_
+{+ 'F' 0 u;
+ 'F' 8 v;
+ 'F' 16 vv;
+};
+
+defn
+_3_(addr) {+ complex _3_ addr;
+ print(" u ", addr.u, "\n");+ print(" v ", addr.v, "\n");+ print(" vv ", addr.vv, "\n");+};
+
+sizeof_4_ = 24;
+aggr _4_
+{+ 'F' 0 i;
+ 'F' 8 j;
+ 'F' 16 k;
+};
+
+defn
+_4_(addr) {+ complex _4_ addr;
+ print(" i ", addr.i, "\n");+ print(" j ", addr.j, "\n");+ print(" k ", addr.k, "\n");+};
+
+sizeof_5_ = 32;
+aggr _5_
+{+ {+ 'F' 0 x;
+ 'F' 8 y;
+ 'F' 16 z;
+ 'F' 24 w;
+ };
+ {+ 'F' 0 u;
+ 'F' 8 v;
+ 'F' 16 vv;
+ };
+ {+ 'F' 0 i;
+ 'F' 8 j;
+ 'F' 16 k;
+ };
+};
+
+defn
+_5_(addr) {+ complex _5_ addr;
+ print("_2_ {\n");+ _2_(addr+0);
+ print("}\n");+ print("_3_ {\n");+ _3_(addr+0);
+ print("}\n");+ print("_4_ {\n");+ _4_(addr+0);
+ print("}\n");+};
+
+sizeofOBJVertex = 32;
+aggr OBJVertex
+{+ {+ {+ 'F' 0 x;
+ 'F' 8 y;
+ 'F' 16 z;
+ 'F' 24 w;
+ };
+ {+ 'F' 0 u;
+ 'F' 8 v;
+ 'F' 16 vv;
+ };
+ {+ 'F' 0 i;
+ 'F' 8 j;
+ 'F' 16 k;
+ };
+ };
+};
+
+defn
+OBJVertex(addr) {+ complex OBJVertex addr;
+ print("_5_ {\n");+ _5_(addr+0);
+ print("}\n");+};
+
+sizeofOBJVertexArray = 16;
+aggr OBJVertexArray
+{+ 'A' OBJVertex 0 verts;
+ 'D' 8 nvert;
+};
+
+defn
+OBJVertexArray(addr) {+ complex OBJVertexArray addr;
+ print(" verts ", addr.verts\Y, "\n");+ print(" nvert ", addr.nvert, "\n");+};
+
+sizeofOBJElem = 24;
+aggr OBJElem
+{+ 'Y' 0 indices;
+ 'D' 8 nindex;
+ 'D' 12 type;
+ 'A' OBJElem 16 next;
+};
+
+defn
+OBJElem(addr) {+ complex OBJElem addr;
+ print(" indices ", addr.indices\Y, "\n");+ print(" nindex ", addr.nindex, "\n");+ print(" type ", addr.type, "\n");+ print(" next ", addr.next\Y, "\n");+};
+
+sizeofOBJObject = 24;
+aggr OBJObject
+{+ 'Y' 0 name;
+ 'A' OBJElem 8 child;
+ 'A' OBJObject 16 next;
+};
+
+defn
+OBJObject(addr) {+ complex OBJObject addr;
+ print(" name ", addr.name\Y, "\n");+ print(" child ", addr.child\Y, "\n");+ print(" next ", addr.next\Y, "\n");+};
+
+sizeofOBJ = 192;
+aggr OBJ
+{+ 'a' 0 vertdata;
+ 'a' 64 objtab;
+};
+
+defn
+OBJ(addr) {+ complex OBJ addr;
+ print(" vertdata ", addr.vertdata, "\n");+ print(" objtab ", addr.objtab, "\n");+};
+
+complex OBJ main:obj;
--- /dev/null
+++ b/libobj/test/main.c
@@ -1,0 +1,35 @@
+#include <u.h>
+#include <libc.h>
+#include "../../obj.h"
+
+static char fd0[] = "/fd/0";
+
+void
+usage(void)
+{+ fprint(2, "usage: %s [file]\n", argv0);
+ exits("usage");+}
+
+void
+main(int argc, char *argv[])
+{+ OBJ *obj;
+ char *f;
+
+ f = fd0;
+ OBJfmtinstall();
+ ARGBEGIN{+ default: usage();
+ }ARGEND;
+ if(argc > 1)
+ usage();
+ if(argc == 1)
+ f = argv[0];
+ obj = objparse(f);
+ if(obj == nil)
+ sysfatal("objparse: %r");+ print("%O\n", obj);+ objfree(obj);
+ exits(0);
+}
--- /dev/null
+++ b/libobj/test/mkfile
@@ -1,0 +1,21 @@
+</$objtype/mkfile
+
+BIN=$home/$objtype/bin
+TARG=objtest
+OFILES=\
+ main.$O\
+
+HFILES=../../obj.h
+
+LIB=\
+ ../../libobj.a$O\
+
+</sys/src/cmd/mkone
+
+../../libobj.a$O:
+ cd ..
+ mk install
+
+clean nuke:V:
+ rm -f *.[$OS] [$OS].out y.tab.? y.debug y.output $TARG
+ @{cd ..; mk $target}--- /dev/null
+++ b/main.acid
@@ -1,0 +1,1153 @@
+sizeof_1_ = 8;
+aggr _1_
+{+ 'U' 0 lo;
+ 'U' 4 hi;
+};
+
+defn
+_1_(addr) {+ complex _1_ addr;
+ print(" lo ", addr.lo, "\n");+ print(" hi ", addr.hi, "\n");+};
+
+sizeofFPdbleword = 8;
+aggr FPdbleword
+{+ 'F' 0 x;
+ {+ 'U' 0 lo;
+ 'U' 4 hi;
+ };
+};
+
+defn
+FPdbleword(addr) {+ complex FPdbleword addr;
+ print(" x ", addr.x, "\n");+ print("_1_ {\n");+ _1_(addr+0);
+ print("}\n");+};
+
+UTFmax = 4;
+Runesync = 128;
+Runeself = 128;
+Runeerror = 65533;
+Runemax = 1114111;
+Runemask = 2097151;
+sizeofFmt = 80;
+aggr Fmt
+{+ 'b' 0 runes;
+ 'Y' 8 start;
+ 'Y' 16 to;
+ 'Y' 24 stop;
+ 'Y' 32 flush;
+ 'Y' 40 farg;
+ 'D' 48 nfmt;
+ 'Y' 56 args;
+ 'D' 64 r;
+ 'D' 68 width;
+ 'D' 72 prec;
+ 'U' 76 flags;
+};
+
+defn
+Fmt(addr) {+ complex Fmt addr;
+ print(" runes ", addr.runes, "\n");+ print(" start ", addr.start\Y, "\n");+ print(" to ", addr.to\Y, "\n");+ print(" stop ", addr.stop\Y, "\n");+ print(" flush ", addr.flush\Y, "\n");+ print(" farg ", addr.farg\Y, "\n");+ print(" nfmt ", addr.nfmt, "\n");+ print(" args ", addr.args\Y, "\n");+ print(" r ", addr.r, "\n");+ print(" width ", addr.width, "\n");+ print(" prec ", addr.prec, "\n");+ print(" flags ", addr.flags, "\n");+};
+
+FmtWidth = 1;
+FmtLeft = 2;
+FmtPrec = 4;
+FmtSharp = 8;
+FmtSpace = 16;
+FmtSign = 32;
+FmtZero = 64;
+FmtUnsigned = 128;
+FmtShort = 256;
+FmtLong = 512;
+FmtVLong = 1024;
+FmtComma = 2048;
+FmtByte = 4096;
+FmtFlag = 8192;
+sizeofTm = 40;
+aggr Tm
+{+ 'D' 0 sec;
+ 'D' 4 min;
+ 'D' 8 hour;
+ 'D' 12 mday;
+ 'D' 16 mon;
+ 'D' 20 year;
+ 'D' 24 wday;
+ 'D' 28 yday;
+ 'a' 32 zone;
+ 'D' 36 tzoff;
+};
+
+defn
+Tm(addr) {+ complex Tm addr;
+ print(" sec ", addr.sec, "\n");+ print(" min ", addr.min, "\n");+ print(" hour ", addr.hour, "\n");+ print(" mday ", addr.mday, "\n");+ print(" mon ", addr.mon, "\n");+ print(" year ", addr.year, "\n");+ print(" wday ", addr.wday, "\n");+ print(" yday ", addr.yday, "\n");+ print(" zone ", addr.zone, "\n");+ print(" tzoff ", addr.tzoff, "\n");+};
+
+PNPROC = 1;
+PNGROUP = 2;
+Profoff = 0;
+Profuser = 1;
+Profkernel = 2;
+Proftime = 3;
+Profsample = 4;
+sizeofLock = 8;
+aggr Lock
+{+ 'D' 0 val;
+};
+
+defn
+Lock(addr) {+ complex Lock addr;
+ print(" val ", addr.val, "\n");+};
+
+sizeofQLp = 16;
+aggr QLp
+{+ 'D' 0 inuse;
+ 'D' 4 state;
+ 'A' QLp 8 next;
+};
+
+defn
+QLp(addr) {+ complex QLp addr;
+ print(" inuse ", addr.inuse, "\n");+ print(" state ", addr.state, "\n");+ print(" next ", addr.next\Y, "\n");+};
+
+sizeofQLock = 32;
+aggr QLock
+{+ Lock 0 lock;
+ 'D' 8 locked;
+ 'A' QLp 16 $head;
+ 'A' QLp 24 $tail;
+};
+
+defn
+QLock(addr) {+ complex QLock addr;
+ print("Lock lock {\n");+ Lock(addr.lock);
+ print("}\n");+ print(" locked ", addr.locked, "\n");+ print(" $head ", addr.$head\Y, "\n");+ print(" $tail ", addr.$tail\Y, "\n");+};
+
+sizeofRWLock = 32;
+aggr RWLock
+{+ Lock 0 lock;
+ 'D' 8 readers;
+ 'D' 12 writer;
+ 'A' QLp 16 $head;
+ 'A' QLp 24 $tail;
+};
+
+defn
+RWLock(addr) {+ complex RWLock addr;
+ print("Lock lock {\n");+ Lock(addr.lock);
+ print("}\n");+ print(" readers ", addr.readers, "\n");+ print(" writer ", addr.writer, "\n");+ print(" $head ", addr.$head\Y, "\n");+ print(" $tail ", addr.$tail\Y, "\n");+};
+
+sizeofRendez = 24;
+aggr Rendez
+{+ 'A' QLock 0 l;
+ 'A' QLp 8 $head;
+ 'A' QLp 16 $tail;
+};
+
+defn
+Rendez(addr) {+ complex Rendez addr;
+ print(" l ", addr.l\Y, "\n");+ print(" $head ", addr.$head\Y, "\n");+ print(" $tail ", addr.$tail\Y, "\n");+};
+
+sizeofNetConnInfo = 72;
+aggr NetConnInfo
+{+ 'Y' 0 dir;
+ 'Y' 8 root;
+ 'Y' 16 spec;
+ 'Y' 24 lsys;
+ 'Y' 32 lserv;
+ 'Y' 40 rsys;
+ 'Y' 48 rserv;
+ 'Y' 56 laddr;
+ 'Y' 64 raddr;
+};
+
+defn
+NetConnInfo(addr) {+ complex NetConnInfo addr;
+ print(" dir ", addr.dir\Y, "\n");+ print(" root ", addr.root\Y, "\n");+ print(" spec ", addr.spec\Y, "\n");+ print(" lsys ", addr.lsys\Y, "\n");+ print(" lserv ", addr.lserv\Y, "\n");+ print(" rsys ", addr.rsys\Y, "\n");+ print(" rserv ", addr.rserv\Y, "\n");+ print(" laddr ", addr.laddr\Y, "\n");+ print(" raddr ", addr.raddr\Y, "\n");+};
+
+RFNAMEG = 1;
+RFENVG = 2;
+RFFDG = 4;
+RFNOTEG = 8;
+RFPROC = 16;
+RFMEM = 32;
+RFNOWAIT = 64;
+RFCNAMEG = 1024;
+RFCENVG = 2048;
+RFCFDG = 4096;
+RFREND = 8192;
+RFNOMNT = 16384;
+sizeofQid = 16;
+aggr Qid
+{+ 'W' 0 path;
+ 'U' 8 vers;
+ 'b' 12 type;
+};
+
+defn
+Qid(addr) {+ complex Qid addr;
+ print(" path ", addr.path, "\n");+ print(" vers ", addr.vers, "\n");+ print(" type ", addr.type, "\n");+};
+
+sizeofDir = 80;
+aggr Dir
+{+ 'u' 0 type;
+ 'U' 4 dev;
+ Qid 8 qid;
+ 'U' 24 mode;
+ 'U' 28 atime;
+ 'U' 32 mtime;
+ 'V' 40 length;
+ 'Y' 48 name;
+ 'Y' 56 uid;
+ 'Y' 64 gid;
+ 'Y' 72 muid;
+};
+
+defn
+Dir(addr) {+ complex Dir addr;
+ print(" type ", addr.type, "\n");+ print(" dev ", addr.dev, "\n");+ print("Qid qid {\n");+ Qid(addr.qid);
+ print("}\n");+ print(" mode ", addr.mode, "\n");+ print(" atime ", addr.atime, "\n");+ print(" mtime ", addr.mtime, "\n");+ print(" length ", addr.length, "\n");+ print(" name ", addr.name\Y, "\n");+ print(" uid ", addr.uid\Y, "\n");+ print(" gid ", addr.gid\Y, "\n");+ print(" muid ", addr.muid\Y, "\n");+};
+
+sizeofWaitmsg = 24;
+aggr Waitmsg
+{+ 'D' 0 pid;
+ 'a' 4 time;
+ 'Y' 16 msg;
+};
+
+defn
+Waitmsg(addr) {+ complex Waitmsg addr;
+ print(" pid ", addr.pid, "\n");+ print(" time ", addr.time, "\n");+ print(" msg ", addr.msg\Y, "\n");+};
+
+sizeofIOchunk = 16;
+aggr IOchunk
+{+ 'Y' 0 addr;
+ 'U' 8 len;
+};
+
+defn
+IOchunk(addr) {+ complex IOchunk addr;
+ print(" addr ", addr.addr\Y, "\n");+ print(" len ", addr.len, "\n");+};
+
+Nqwds = 2;
+Nqshift = 5;
+Nqmask = -1;
+Nqbits = 64;
+sizeofChannel = 48;
+aggr Channel
+{+ 'D' 0 s;
+ 'U' 4 f;
+ 'U' 8 n;
+ 'D' 12 e;
+ 'D' 16 freed;
+ 'Y' 24 qentry;
+ 'D' 32 nentry;
+ 'D' 36 closed;
+ 'a' 40 v;
+};
+
+defn
+Channel(addr) {+ complex Channel addr;
+ print(" s ", addr.s, "\n");+ print(" f ", addr.f, "\n");+ print(" n ", addr.n, "\n");+ print(" e ", addr.e, "\n");+ print(" freed ", addr.freed, "\n");+ print(" qentry ", addr.qentry\Y, "\n");+ print(" nentry ", addr.nentry, "\n");+ print(" closed ", addr.closed, "\n");+ print(" v ", addr.v, "\n");+};
+
+CHANEND = 0;
+CHANSND = 1;
+CHANRCV = 2;
+CHANNOP = 3;
+CHANNOBLK = 4;
+sizeofAlt = 48;
+aggr Alt
+{+ 'A' Channel 0 c;
+ 'Y' 8 v;
+ 'D' 16 op;
+ 'Y' 24 err;
+ 'A' Channel 32 tag;
+ 'D' 40 entryno;
+};
+
+defn
+Alt(addr) {+ complex Alt addr;
+ print(" c ", addr.c\Y, "\n");+ print(" v ", addr.v\Y, "\n");+ print(" op ", addr.op, "\n");+ print(" err ", addr.err\Y, "\n");+ print(" tag ", addr.tag\Y, "\n");+ print(" entryno ", addr.entryno, "\n");+};
+
+sizeofRef = 8;
+aggr Ref
+{+ 'D' 0 ref;
+};
+
+defn
+Ref(addr) {+ complex Ref addr;
+ print(" ref ", addr.ref, "\n");+};
+
+DOpaque = 4294967295;
+DTransparent = 0;
+DBlack = 255;
+DWhite = 4294967295;
+DRed = 4278190335;
+DGreen = 16711935;
+DBlue = 65535;
+DCyan = 16777215;
+DMagenta = 4278255615;
+DYellow = 4294902015;
+DPaleyellow = 4294945535;
+DDarkyellow = 4008615679;
+DDarkgreen = 1149781247;
+DPalegreen = 2868882175;
+DMedgreen = 2295105791;
+DDarkblue = 22015;
+DPalebluegreen = 2868903935;
+DPaleblue = 48127;
+DBluegreen = 8947967;
+DGreygreen = 1437248255;
+DPalegreygreen = 2666458879;
+DYellowgreen = 2576960767;
+DMedblue = 39423;
+DGreyblue = 6142975;
+DPalegreyblue = 1234427391;
+DPurpleblue = 2290666751;
+DNotacolor = 4294967040;
+DNofill = 4294967040;
+Displaybufsize = 8000;
+ICOSSCALE = 1024;
+Borderwidth = 4;
+Refbackup = 0;
+Refnone = 1;
+Refmesg = 2;
+Endsquare = 0;
+Enddisc = 1;
+Endarrow = 2;
+Endmask = 31;
+Clear = 0;
+SinD = 8;
+DinS = 4;
+SoutD = 2;
+DoutS = 1;
+S = 10;
+SoverD = 11;
+SatopD = 9;
+SxorD = 3;
+D = 5;
+DoverS = 7;
+DatopS = 6;
+DxorS = 3;
+Ncomp = 12;
+CRed = 0;
+CGreen = 1;
+CBlue = 2;
+CGrey = 3;
+CAlpha = 4;
+CMap = 5;
+CIgnore = 6;
+NChan = 7;
+GREY1 = 49;
+GREY2 = 50;
+GREY4 = 52;
+GREY8 = 56;
+CMAP8 = 88;
+RGB15 = 1627723045;
+RGB16 = 333349;
+RGB24 = 530472;
+RGBA32 = 135800904;
+ARGB32 = 1208490024;
+XRGB32 = 1745360936;
+BGR24 = 2627592;
+ABGR32 = 1210587144;
+XBGR32 = 1747458056;
+sizeofPoint = 8;
+aggr Point
+{+ 'D' 0 x;
+ 'D' 4 y;
+};
+
+defn
+Point(addr) {+ complex Point addr;
+ print(" x ", addr.x, "\n");+ print(" y ", addr.y, "\n");+};
+
+sizeofRectangle = 16;
+aggr Rectangle
+{+ Point 0 min;
+ Point 8 max;
+};
+
+defn
+Rectangle(addr) {+ complex Rectangle addr;
+ print("Point min {\n");+ Point(addr.min);
+ print("}\n");+ print("Point max {\n");+ Point(addr.max);
+ print("}\n");+};
+
+sizeofScreen = 32;
+aggr Screen
+{+ 'Y' 0 display;
+ 'D' 8 id;
+ 'Y' 16 image;
+ 'Y' 24 fill;
+};
+
+defn
+Screen(addr) {+ complex Screen addr;
+ print(" display ", addr.display\Y, "\n");+ print(" id ", addr.id, "\n");+ print(" image ", addr.image\Y, "\n");+ print(" fill ", addr.fill\Y, "\n");+};
+
+sizeofDisplay = 264;
+aggr Display
+{+ QLock 0 qlock;
+ 'D' 32 locking;
+ 'D' 36 dirno;
+ 'D' 40 fd;
+ 'D' 44 reffd;
+ 'D' 48 ctlfd;
+ 'D' 52 imageid;
+ 'D' 56 $local;
+ 'Y' 64 error;
+ 'Y' 72 devdir;
+ 'Y' 80 windir;
+ 'a' 88 oldlabel;
+ 'U' 152 dataqid;
+ 'Y' 160 white;
+ 'Y' 168 black;
+ 'Y' 176 opaque;
+ 'Y' 184 transparent;
+ 'Y' 192 image;
+ 'Y' 200 buf;
+ 'D' 208 bufsize;
+ 'Y' 216 bufp;
+ 'Y' 224 defaultfont;
+ 'Y' 232 defaultsubfont;
+ 'Y' 240 windows;
+ 'Y' 248 screenimage;
+ 'D' 256 _isnewdisplay;
+};
+
+defn
+Display(addr) {+ complex Display addr;
+ print("QLock qlock {\n");+ QLock(addr.qlock);
+ print("}\n");+ print(" locking ", addr.locking, "\n");+ print(" dirno ", addr.dirno, "\n");+ print(" fd ", addr.fd, "\n");+ print(" reffd ", addr.reffd, "\n");+ print(" ctlfd ", addr.ctlfd, "\n");+ print(" imageid ", addr.imageid, "\n");+ print(" $local ", addr.$local, "\n");+ print(" error ", addr.error\Y, "\n");+ print(" devdir ", addr.devdir\Y, "\n");+ print(" windir ", addr.windir\Y, "\n");+ print(" oldlabel ", addr.oldlabel, "\n");+ print(" dataqid ", addr.dataqid, "\n");+ print(" white ", addr.white\Y, "\n");+ print(" black ", addr.black\Y, "\n");+ print(" opaque ", addr.opaque\Y, "\n");+ print(" transparent ", addr.transparent\Y, "\n");+ print(" image ", addr.image\Y, "\n");+ print(" buf ", addr.buf\Y, "\n");+ print(" bufsize ", addr.bufsize, "\n");+ print(" bufp ", addr.bufp\Y, "\n");+ print(" defaultfont ", addr.defaultfont\Y, "\n");+ print(" defaultsubfont ", addr.defaultsubfont\Y, "\n");+ print(" windows ", addr.windows\Y, "\n");+ print(" screenimage ", addr.screenimage\Y, "\n");+ print(" _isnewdisplay ", addr._isnewdisplay, "\n");+};
+
+sizeofImage = 80;
+aggr Image
+{+ 'A' Display 0 display;
+ 'D' 8 id;
+ Rectangle 16 r;
+ Rectangle 32 clipr;
+ 'D' 48 depth;
+ 'U' 52 chan;
+ 'D' 56 repl;
+ 'A' Screen 64 screen;
+ 'A' Image 72 next;
+};
+
+defn
+Image(addr) {+ complex Image addr;
+ print(" display ", addr.display\Y, "\n");+ print(" id ", addr.id, "\n");+ print("Rectangle r {\n");+ Rectangle(addr.r);
+ print("}\n");+ print("Rectangle clipr {\n");+ Rectangle(addr.clipr);
+ print("}\n");+ print(" depth ", addr.depth, "\n");+ print(" chan ", addr.chan, "\n");+ print(" repl ", addr.repl, "\n");+ print(" screen ", addr.screen\Y, "\n");+ print(" next ", addr.next\Y, "\n");+};
+
+sizeofRGB = 16;
+aggr RGB
+{+ 'U' 0 red;
+ 'U' 4 green;
+ 'U' 8 blue;
+};
+
+defn
+RGB(addr) {+ complex RGB addr;
+ print(" red ", addr.red, "\n");+ print(" green ", addr.green, "\n");+ print(" blue ", addr.blue, "\n");+};
+
+sizeofFontchar = 8;
+aggr Fontchar
+{+ 'D' 0 x;
+ 'b' 4 top;
+ 'b' 5 bottom;
+ 'C' 6 left;
+ 'b' 7 width;
+};
+
+defn
+Fontchar(addr) {+ complex Fontchar addr;
+ print(" x ", addr.x, "\n");+ print(" top ", addr.top, "\n");+ print(" bottom ", addr.bottom, "\n");+ print(" left ", addr.left, "\n");+ print(" width ", addr.width, "\n");+};
+
+sizeofSubfont = 40;
+aggr Subfont
+{+ 'Y' 0 name;
+ 'd' 8 n;
+ 'b' 10 height;
+ 'C' 11 ascent;
+ 'A' Fontchar 16 info;
+ 'A' Image 24 bits;
+ 'D' 32 ref;
+};
+
+defn
+Subfont(addr) {+ complex Subfont addr;
+ print(" name ", addr.name\Y, "\n");+ print(" n ", addr.n, "\n");+ print(" height ", addr.height, "\n");+ print(" ascent ", addr.ascent, "\n");+ print(" info ", addr.info\Y, "\n");+ print(" bits ", addr.bits\Y, "\n");+ print(" ref ", addr.ref, "\n");+};
+
+LOG2NFCACHE = 6;
+NFCACHE = 64;
+NFLOOK = 5;
+NFSUBF = 2;
+MAXFCACHE = 1029;
+MAXSUBF = 50;
+DSUBF = 4;
+SUBFAGE = 10000;
+CACHEAGE = 10000;
+sizeofCachefont = 32;
+aggr Cachefont
+{+ 'U' 0 min;
+ 'U' 4 max;
+ 'D' 8 offset;
+ 'Y' 16 name;
+ 'Y' 24 subfontname;
+};
+
+defn
+Cachefont(addr) {+ complex Cachefont addr;
+ print(" min ", addr.min, "\n");+ print(" max ", addr.max, "\n");+ print(" offset ", addr.offset, "\n");+ print(" name ", addr.name\Y, "\n");+ print(" subfontname ", addr.subfontname\Y, "\n");+};
+
+sizeofCacheinfo = 16;
+aggr Cacheinfo
+{+ 'u' 0 x;
+ 'b' 2 width;
+ 'C' 3 left;
+ 'U' 4 value;
+ 'u' 8 age;
+};
+
+defn
+Cacheinfo(addr) {+ complex Cacheinfo addr;
+ print(" x ", addr.x, "\n");+ print(" width ", addr.width, "\n");+ print(" left ", addr.left, "\n");+ print(" value ", addr.value, "\n");+ print(" age ", addr.age, "\n");+};
+
+sizeofCachesubf = 24;
+aggr Cachesubf
+{+ 'U' 0 age;
+ 'A' Cachefont 8 cf;
+ 'A' Subfont 16 f;
+};
+
+defn
+Cachesubf(addr) {+ complex Cachesubf addr;
+ print(" age ", addr.age, "\n");+ print(" cf ", addr.cf\Y, "\n");+ print(" f ", addr.f\Y, "\n");+};
+
+sizeofFont = 72;
+aggr Font
+{+ 'Y' 0 name;
+ 'A' Display 8 display;
+ 'd' 16 height;
+ 'd' 18 ascent;
+ 'd' 20 width;
+ 'd' 22 nsub;
+ 'U' 24 age;
+ 'D' 28 maxdepth;
+ 'D' 32 ncache;
+ 'D' 36 nsubf;
+ 'A' Cacheinfo 40 cache;
+ 'A' Cachesubf 48 subf;
+ 'A' Cachefont 56 sub;
+ 'A' Image 64 cacheimage;
+};
+
+defn
+Font(addr) {+ complex Font addr;
+ print(" name ", addr.name\Y, "\n");+ print(" display ", addr.display\Y, "\n");+ print(" height ", addr.height, "\n");+ print(" ascent ", addr.ascent, "\n");+ print(" width ", addr.width, "\n");+ print(" nsub ", addr.nsub, "\n");+ print(" age ", addr.age, "\n");+ print(" maxdepth ", addr.maxdepth, "\n");+ print(" ncache ", addr.ncache, "\n");+ print(" nsubf ", addr.nsubf, "\n");+ print(" cache ", addr.cache\Y, "\n");+ print(" subf ", addr.subf\Y, "\n");+ print(" sub ", addr.sub\Y, "\n");+ print(" cacheimage ", addr.cacheimage\Y, "\n");+};
+
+complex Point ZP;
+complex Rectangle ZR;
+complex Display display;
+complex Font font;
+complex Image screen;
+complex Screen _screen;
+sizeofMouse = 24;
+aggr Mouse
+{+ 'D' 0 buttons;
+ Point 8 xy;
+ 'U' 16 msec;
+};
+
+defn
+Mouse(addr) {+ complex Mouse addr;
+ print(" buttons ", addr.buttons, "\n");+ print("Point xy {\n");+ Point(addr.xy);
+ print("}\n");+ print(" msec ", addr.msec, "\n");+};
+
+sizeofMousectl = 72;
+aggr Mousectl
+{+ {+ 'D' 0 buttons;
+ Point 8 xy;
+ 'U' 16 msec;
+ };
+ 'A' Channel 24 c;
+ 'A' Channel 32 resizec;
+ 'Y' 40 file;
+ 'D' 48 mfd;
+ 'D' 52 cfd;
+ 'D' 56 pid;
+ 'A' Image 64 image;
+};
+
+defn
+Mousectl(addr) {+ complex Mousectl addr;
+ print("Mouse {\n");+ Mouse(addr+0);
+ print("}\n");+ print(" c ", addr.c\Y, "\n");+ print(" resizec ", addr.resizec\Y, "\n");+ print(" file ", addr.file\Y, "\n");+ print(" mfd ", addr.mfd, "\n");+ print(" cfd ", addr.cfd, "\n");+ print(" pid ", addr.pid, "\n");+ print(" image ", addr.image\Y, "\n");+};
+
+sizeofMenu = 24;
+aggr Menu
+{+ 'Y' 0 item;
+ 'Y' 8 gen;
+ 'D' 16 lasthit;
+};
+
+defn
+Menu(addr) {+ complex Menu addr;
+ print(" item ", addr.item\Y, "\n");+ print(" gen ", addr.gen\Y, "\n");+ print(" lasthit ", addr.lasthit, "\n");+};
+
+sizeofKeyboardctl = 32;
+aggr Keyboardctl
+{+ 'A' Channel 0 c;
+ 'Y' 8 file;
+ 'D' 16 consfd;
+ 'D' 20 ctlfd;
+ 'D' 24 pid;
+};
+
+defn
+Keyboardctl(addr) {+ complex Keyboardctl addr;
+ print(" c ", addr.c\Y, "\n");+ print(" file ", addr.file\Y, "\n");+ print(" consfd ", addr.consfd, "\n");+ print(" ctlfd ", addr.ctlfd, "\n");+ print(" pid ", addr.pid, "\n");+};
+
+KF = 61440;
+Spec = 63488;
+PF = 63520;
+Kview = 63488;
+Khome = 61453;
+Kup = 61454;
+Kdown = 63488;
+Kpgup = 61455;
+Kprint = 61456;
+Kleft = 61457;
+Kright = 61458;
+Kpgdown = 61459;
+Kins = 61460;
+Kalt = 61461;
+Kshift = 61462;
+Kctl = 61463;
+Kend = 61464;
+Kscroll = 61465;
+Kscrolloneup = 61472;
+Kscrollonedown = 61473;
+Ksoh = 1;
+Kstx = 2;
+Ketx = 3;
+Keof = 4;
+Kenq = 5;
+Kack = 6;
+Kbs = 8;
+Knack = 21;
+Ketb = 23;
+Kdel = 127;
+Kesc = 27;
+Kbreak = 63585;
+Kcaps = 63588;
+Knum = 63589;
+Kmiddle = 63590;
+Kaltgr = 63591;
+Kmouse = 63744;
+sizeofPoint2 = 24;
+aggr Point2
+{+ 'F' 0 x;
+ 'F' 8 y;
+ 'F' 16 w;
+};
+
+defn
+Point2(addr) {+ complex Point2 addr;
+ print(" x ", addr.x, "\n");+ print(" y ", addr.y, "\n");+ print(" w ", addr.w, "\n");+};
+
+sizeofPoint3 = 32;
+aggr Point3
+{+ 'F' 0 x;
+ 'F' 8 y;
+ 'F' 16 z;
+ 'F' 24 w;
+};
+
+defn
+Point3(addr) {+ complex Point3 addr;
+ print(" x ", addr.x, "\n");+ print(" y ", addr.y, "\n");+ print(" z ", addr.z, "\n");+ print(" w ", addr.w, "\n");+};
+
+sizeofQuaternion = 32;
+aggr Quaternion
+{+ 'F' 0 r;
+ 'F' 8 i;
+ 'F' 16 j;
+ 'F' 24 k;
+};
+
+defn
+Quaternion(addr) {+ complex Quaternion addr;
+ print(" r ", addr.r, "\n");+ print(" i ", addr.i, "\n");+ print(" j ", addr.j, "\n");+ print(" k ", addr.k, "\n");+};
+
+sizeofReferenceFrame = 72;
+aggr ReferenceFrame
+{+ Point2 0 p;
+ Point2 24 xb;
+ Point2 48 yb;
+};
+
+defn
+ReferenceFrame(addr) {+ complex ReferenceFrame addr;
+ print("Point2 p {\n");+ Point2(addr.p);
+ print("}\n");+ print("Point2 xb {\n");+ Point2(addr.xb);
+ print("}\n");+ print("Point2 yb {\n");+ Point2(addr.yb);
+ print("}\n");+};
+
+sizeofReferenceFrame3 = 128;
+aggr ReferenceFrame3
+{+ Point3 0 p;
+ Point3 32 xb;
+ Point3 64 yb;
+ Point3 96 zb;
+};
+
+defn
+ReferenceFrame3(addr) {+ complex ReferenceFrame3 addr;
+ print("Point3 p {\n");+ Point3(addr.p);
+ print("}\n");+ print("Point3 xb {\n");+ Point3(addr.xb);
+ print("}\n");+ print("Point3 yb {\n");+ Point3(addr.yb);
+ print("}\n");+ print("Point3 zb {\n");+ Point3(addr.zb);
+ print("}\n");+};
+
+sizeofTriangle3 = 96;
+aggr Triangle3
+{+ Point3 0 p0;
+ Point3 32 p1;
+ Point3 64 p2;
+};
+
+defn
+Triangle3(addr) {+ complex Triangle3 addr;
+ print("Point3 p0 {\n");+ Point3(addr.p0);
+ print("}\n");+ print("Point3 p1 {\n");+ Point3(addr.p1);
+ print("}\n");+ print("Point3 p2 {\n");+ Point3(addr.p2);
+ print("}\n");+};
+
+Portho = 0;
+Ppersp = 1;
+sizeofVertex = 64;
+aggr Vertex
+{+ Point3 0 p;
+ Point3 32 n;
+};
+
+defn
+Vertex(addr) {+ complex Vertex addr;
+ print("Point3 p {\n");+ Point3(addr.p);
+ print("}\n");+ print("Point3 n {\n");+ Point3(addr.n);
+ print("}\n");+};
+
+sizeofTriangle = 24;
+aggr Triangle
+{+ Point 0 p0;
+ Point 8 p1;
+ Point 16 p2;
+};
+
+defn
+Triangle(addr) {+ complex Triangle addr;
+ print("Point p0 {\n");+ Point(addr.p0);
+ print("}\n");+ print("Point p1 {\n");+ Point(addr.p1);
+ print("}\n");+ print("Point p2 {\n");+ Point(addr.p2);
+ print("}\n");+};
+
+sizeof_2_ = 16;
+aggr _2_
+{+ 'F' 0 n;
+ 'F' 8 f;
+};
+
+defn
+_2_(addr) {+ complex _2_ addr;
+ print(" n ", addr.n, "\n");+ print(" f ", addr.f, "\n");+};
+
+sizeofCamera = 296;
+aggr Camera
+{+ {+ Point3 0 p;
+ Point3 32 xb;
+ Point3 64 yb;
+ Point3 96 zb;
+ };
+ 'A' Image 128 viewport;
+ 'F' 136 fov;
+ _2_ 144 clip;
+ 'D' 160 ptype;
+ 'a' 168 proj;
+};
+
+defn
+Camera(addr) {+ complex Camera addr;
+ print("ReferenceFrame3 {\n");+ ReferenceFrame3(addr+0);
+ print("}\n");+ print(" viewport ", addr.viewport\Y, "\n");+ print(" fov ", addr.fov, "\n");+ print("_2_ clip {\n");+ _2_(addr.clip);
+ print("}\n");+ print(" ptype ", addr.ptype, "\n");+ print(" proj ", addr.proj, "\n");+};
+
+STACK = 8192;
+SEC = 1000;
+FPS = 60;
+Scamno = 0;
+Scampos = 1;
+Scambs = 2;
+Sfov = 3;
+Se = 4;
+complex Mousectl mctl;
+complex Keyboardctl kctl;
+complex ReferenceFrame scrrf;
+complex RWLock worldlock;
+complex Triangle3 tri;
+complex Camera cam0;
+complex Camera cam1;
+complex Camera cam2;
+complex Camera cam3;
+complex Camera maincam;
+complex Fmt vfmt:f;
+complex Point2 vfmt:p;
+complex Fmt Vfmt:f;
+complex Point3 Vfmt:p;
+complex Point3 flatten:p;
+complex Point2 toscreen:p;
+complex Point fromscreen:p;
+complex Triangle redraw:trit;
+complex Quaternion key:q;
+complex Quaternion key:qtmp;
+MOUSE = 0;
+KBD = 1;
+RESIZE = 2;
--- /dev/null
+++ b/main.c
@@ -1,0 +1,396 @@
+#include <u.h>
+#include <libc.h>
+#include <thread.h>
+#include <draw.h>
+#include <mouse.h>
+#include <keyboard.h>
+#include "geometry.h"
+#include "graphics.h"
+#include "obj.h"
+#include "dat.h"
+#include "fns.h"
+
+Rune keys[Ke] = {+ [K↑] = Kup,
+ [K↓] = Kdown,
+ [K←] = Kleft,
+ [K→] = Kright,
+ [Krise] = Kpgup,
+ [Kfall] = Kpgdown,
+ [KR↑] = 'w',
+ [KR↓] = 's',
+ [KR←] = 'a',
+ [KR→] = 'd',
+ [KR↺] = 'q',
+ [KR↻] = 'e',
+ [Kcam0] = KF|1,
+ [Kcam1] = KF|2,
+ [Kcam2] = KF|3,
+ [Kcam3] = KF|4,
+ [Kscrshot] = KF|12
+};
+
+char stats[Se][256];
+
+Mousectl *mctl;
+int kdown;
+double t0, Δt;
+RWLock worldlock;
+Mesh model;
+char *mdlpath = "../threedee/mdl/rocket.obj";
+
+Camera cams[4], *maincam;
+
+#pragma varargck type "v" Point2
+int
+vfmt(Fmt *f)
+{+ Point2 p;
+
+ p = va_arg(f->args, Point2);
+ return fmtprint(f, "[%g %g %g]", p.x, p.y, p.w);
+}
+
+#pragma varargck type "V" Point3
+int
+Vfmt(Fmt *f)
+{+ Point3 p;
+
+ p = va_arg(f->args, Point3);
+ return fmtprint(f, "[%g %g %g %g]", p.x, p.y, p.z, p.w);
+}
+
+void *
+emalloc(ulong n)
+{+ void *p;
+
+ p = malloc(n);
+ if(p == nil)
+ sysfatal("malloc: %r");+ setmalloctag(p, getcallerpc(&n));
+ return p;
+}
+
+void *
+erealloc(void *p, ulong n)
+{+ void *np;
+
+ np = realloc(p, n);
+ if(np == nil)
+ sysfatal("realloc: %r");+ setrealloctag(np, getcallerpc(&p));
+ return np;
+}
+
+int
+depthcmp(void *a, void *b)
+{+ Triangle3 *ta, *tb;
+ double za, zb;
+
+ ta = (Triangle3 *)a;
+ tb = (Triangle3 *)b;
+ za = (ta->p0.z + ta->p1.z + ta->p2.z)/3;
+ zb = (tb->p0.z + tb->p1.z + tb->p2.z)/3;
+ return zb-za;
+}
+
+void
+drawaxis(void)
+{+ Point3 op = (Point3){0, 0, 0, 1},+ px = (Point3){1, 0, 0, 1},+ py = (Point3){0, 1, 0, 1},+ pz = (Point3){0, 0, 1, 1};+
+ line3(maincam, op, px, 0, Endarrow, display->black);
+ string3(maincam, px, display->black, font, "x");
+ line3(maincam, op, py, 0, Endarrow, display->black);
+ string3(maincam, py, display->black, font, "y");
+ line3(maincam, op, pz, 0, Endarrow, display->black);
+ string3(maincam, pz, display->black, font, "z");
+}
+
+void
+drawstats(void)
+{+ int i;
+
+ snprint(stats[Scamno], sizeof(stats[Scamno]), "CAM %d", maincam-cams+1);
+ snprint(stats[Sfov], sizeof(stats[Sfov]), "FOV %g°", maincam->fov);
+ snprint(stats[Scampos], sizeof(stats[Scampos]), "%V", maincam->p);
+ snprint(stats[Scambx], sizeof(stats[Scambx]), "bx %V", maincam->bx);
+ snprint(stats[Scamby], sizeof(stats[Scamby]), "by %V", maincam->by);
+ snprint(stats[Scambz], sizeof(stats[Scambz]), "bz %V", maincam->bz);
+ for(i = 0; i < Se; i++)
+ stringn(maincam->viewport, addpt(screen->r.min, Pt(10, 10 + i*font->height)), display->black, ZP, font, stats[i], sizeof(stats[i]));
+}
+
+void
+redraw(void)
+{+ Triangle3 tmp;
+ static TTriangle3 *vistris;
+ static int nallocvistri;
+ Triangle trit;
+ Point3 n;
+ u8int c;
+ int i, nvistri;
+
+ nvistri = 0;
+ if(nallocvistri == 0 && vistris == nil){+ nallocvistri = model.ntri/2;
+ vistris = emalloc(nallocvistri*sizeof(TTriangle3));
+ }
+ for(i = 0; i < model.ntri; i++){+ /* world to camera */
+ tmp.p0 = WORLD2VCS(maincam, model.tris[i].p0);
+ tmp.p1 = WORLD2VCS(maincam, model.tris[i].p1);
+ tmp.p2 = WORLD2VCS(maincam, model.tris[i].p2);
+ /* back-face culling */
+ n = normvec3(crossvec3(subpt3(tmp.p1, tmp.p0), subpt3(tmp.p2, tmp.p0)));
+ if(dotvec3(n, mulpt3(tmp.p0, -1)) <= 0)
+ continue;
+ /* camera to projected ndc */
+ tmp.p0 = VCS2NDC(maincam, tmp.p0);
+ tmp.p1 = VCS2NDC(maincam, tmp.p1);
+ tmp.p2 = VCS2NDC(maincam, tmp.p2);
+ /* clipping */
+ /*
+ * no clipping for now, the whole triangle is ignored
+ * if any of its vertices gets outside the fustrum.
+ */
+ if(isclipping(tmp.p0) || isclipping(tmp.p1) || isclipping(tmp.p2))
+ continue;
+ if(nvistri >= nallocvistri){+ nallocvistri += model.ntri/3;
+ vistris = erealloc(vistris, nallocvistri*sizeof(TTriangle3));
+ }
+ vistris[nvistri] = (TTriangle3)tmp;
+ c = 0xff*fabs(dotvec3(n, Vec3(0, 0, 1)));
+ vistris[nvistri].tx = allocimage(display, Rect(0, 0, 1, 1), screen->chan, 1, c<<24|c<<16|c<<8|0xff);
+ nvistri++;
+ }
+ qsort(vistris, nvistri, sizeof(TTriangle3), depthcmp);
+ lockdisplay(display);
+ draw(maincam->viewport, maincam->viewport->r, display->white, nil, ZP);
+ drawaxis();
+ for(i = 0; i < nvistri; i++){+ /* ndc to screen */
+ trit.p0 = toviewport(maincam, vistris[i].p0);
+ trit.p1 = toviewport(maincam, vistris[i].p1);
+ trit.p2 = toviewport(maincam, vistris[i].p2);
+ filltriangle(maincam->viewport, trit, vistris[i].tx, ZP);
+ triangle(maincam->viewport, trit, 0, display->black, ZP);
+ freeimage(vistris[i].tx);
+ }
+ drawstats();
+ flushimage(display, 1);
+ unlockdisplay(display);
+}
+
+void
+scrsynproc(void *)
+{+ threadsetname("scrsynproc");+ for(;;){+ rlock(&worldlock);
+ redraw();
+ runlock(&worldlock);
+ sleep(FPS2MS(60));
+ }
+}
+
+void
+screenshot(void)
+{+ int fd;
+ static char buf[128];
+
+ enter("Path", buf, sizeof buf, mctl, nil, nil);+ if(buf[0] == 0)
+ return;
+ fd = create(buf, OWRITE, 0644);
+ if(fd < 0)
+ sysfatal("open: %r");+ if(writeimage(fd, screen, 1) < 0)
+ sysfatal("writeimage: %r");+ close(fd);
+}
+
+void
+mouse(void)
+{+ if(mctl->buttons & 1)
+ fprint(2, "%v\n", fromviewport(maincam, mctl->xy));
+ if(mctl->buttons & 8){+ maincam->fov -= 5;
+ if(maincam->fov < 1)
+ maincam->fov = 1;
+ reloadcamera(maincam);
+ }
+ if(mctl->buttons & 16){+ maincam->fov += 5;
+ if(maincam->fov > 359)
+ maincam->fov = 359;
+ reloadcamera(maincam);
+ }
+}
+
+void
+kbdproc(void *)
+{+ Rune r, *a;
+ char buf[128], *s;
+ int fd, n;
+
+ threadsetname("kbdproc");+ if((fd = open("/dev/kbd", OREAD)) < 0)+ sysfatal("kbdproc: %r");+ memset(buf, 0, sizeof buf);
+ for(;;){+ if(buf[0] != 0){+ n = strlen(buf)+1;
+ memmove(buf, buf+n, sizeof(buf)-n);
+ }
+ if(buf[0] == 0){+ if((n = read(fd, buf, sizeof(buf)-1)) <= 0)
+ break;
+ buf[n-1] = 0;
+ buf[n] = 0;
+ }
+ if(buf[0] == 'c'){+ if(utfrune(buf, Kdel)){+ close(fd);
+ threadexitsall(nil);
+ }
+ }
+ if(buf[0] != 'k' && buf[0] != 'K')
+ continue;
+ s = buf+1;
+ kdown = 0;
+ while(*s){+ s += chartorune(&r, s);
+ for(a = keys; a < keys+Ke; a++)
+ if(r == *a){+ kdown |= 1 << a-keys;
+ break;
+ }
+ }
+ }
+}
+
+void
+handlekeys(void)
+{+ if(kdown & 1<<K↑)
+ placecamera(maincam, subpt3(maincam->p, maincam->bz), maincam->bz, maincam->by);
+ if(kdown & 1<<K↓)
+ placecamera(maincam, addpt3(maincam->p, maincam->bz), maincam->bz, maincam->by);
+ if(kdown & 1<<K←)
+ placecamera(maincam, subpt3(maincam->p, maincam->bx), maincam->bz, maincam->by);
+ if(kdown & 1<<K→)
+ placecamera(maincam, addpt3(maincam->p, maincam->bx), maincam->bz, maincam->by);
+ if(kdown & 1<<Krise)
+ placecamera(maincam, addpt3(maincam->p, maincam->by), maincam->bz, maincam->by);
+ if(kdown & 1<<Kfall)
+ placecamera(maincam, subpt3(maincam->p, maincam->by), maincam->bz, maincam->by);
+ if(kdown & 1<<KR↑)
+ aimcamera(maincam, qrotate(maincam->bz, maincam->bx, 5*DEG));
+ if(kdown & 1<<KR↓)
+ aimcamera(maincam, qrotate(maincam->bz, maincam->bx, -5*DEG));
+ if(kdown & 1<<KR←)
+ aimcamera(maincam, qrotate(maincam->bz, maincam->by, 5*DEG));
+ if(kdown & 1<<KR→)
+ aimcamera(maincam, qrotate(maincam->bz, maincam->by, -5*DEG));
+ if(kdown & 1<<KR↺)
+ placecamera(maincam, maincam->p, maincam->bz, qrotate(maincam->by, maincam->bz, 5*DEG));
+ if(kdown & 1<<KR↻)
+ placecamera(maincam, maincam->p, maincam->bz, qrotate(maincam->by, maincam->bz, -5*DEG));
+ if(kdown & 1<<Kcam0)
+ maincam = &cams[0];
+ if(kdown & 1<<Kcam1)
+ maincam = &cams[1];
+ if(kdown & 1<<Kcam2)
+ maincam = &cams[2];
+ if(kdown & 1<<Kcam3)
+ maincam = &cams[3];
+ if(kdown & 1<<Kscrshot)
+ screenshot();
+}
+
+void
+resize(void)
+{+ lockdisplay(display);
+ if(getwindow(display, Refnone) < 0)
+ fprint(2, "can't reattach to window\n");
+ unlockdisplay(display);
+ maincam->viewport = screen;
+ reloadcamera(maincam);
+}
+
+void
+usage(void)
+{+ fprint(2, "usage: %s\n", argv0);
+ exits("usage");+}
+
+void
+threadmain(int argc, char *argv[])
+{+ OBJ *objmesh;
+
+ fmtinstall('V', Vfmt);+ fmtinstall('v', vfmt);+ ARGBEGIN{+ default: usage();
+ case 'l':
+ mdlpath = EARGF(usage());
+ break;
+ }ARGEND;
+ if(argc != 0)
+ usage();
+ if(initdraw(nil, nil, "3d") < 0)
+ sysfatal("initdraw: %r");+ if((mctl = initmouse(nil, screen)) == nil)
+ sysfatal("initmouse: %r");+ placecamera(&cams[0], Pt3(2, 0, -4, 1), Pt3(0, 0, 0, 1), Vec3(0, 1, 0));
+ configcamera(&cams[0], screen, 90, 0.1, 100, Ppersp);
+ placecamera(&cams[1], Pt3(-2, 0, -4, 1), Pt3(0, 0, 0, 1), Vec3(0, 1, 0));
+ configcamera(&cams[1], screen, 120, 0.1, 100, Ppersp);
+ placecamera(&cams[2], Pt3(-2, 0, 4, 1), Pt3(0, 0, 0, 1), Vec3(0, 1, 0));
+ configcamera(&cams[2], screen, 90, 0.1, 100, Ppersp);
+ placecamera(&cams[3], Pt3(2, 0, 4, 1), Pt3(0, 0, 0, 1), Vec3(0, 1, 0));
+ configcamera(&cams[3], screen, 120, 0.1, 100, Ppersp);
+ maincam = &cams[0];
+ if((objmesh = objparse(mdlpath)) == nil)
+ sysfatal("objparse: %r");+ display->locking = 1;
+ unlockdisplay(display);
+ proccreate(scrsynproc, nil, mainstacksize);
+ proccreate(kbdproc, nil, mainstacksize);
+ t0 = nsec();
+ for(;;){+ enum {MOUSE, RESIZE};+ Alt a[] = {+ {mctl->c, &mctl->Mouse, CHANRCV},+ {mctl->resizec, nil, CHANRCV},+ {nil, nil, CHANNOBLK}+ };
+ wlock(&worldlock);
+ switch(alt(a)){+ case MOUSE: mouse(); break;
+ case RESIZE: resize(); break;
+ }
+ Δt = (nsec()-t0)/1e9;
+ handlekeys();
+ t0 += Δt*1e9;
+ wunlock(&worldlock);
+ sleep(16);
+ }
+}
--- /dev/null
+++ b/mkfile
@@ -1,0 +1,33 @@
+</$objtype/mkfile
+
+BIN=$home/$objtype/bin
+TARG=3d
+OFILES=\
+ main.$O\
+
+HFILES=geometry.h graphics.h obj.h dat.h fns.h
+
+LIB=\
+ libgeometry.a$O\
+ libgraphics.a$O\
+ libobj.a$O
+
+</sys/src/cmd/mkone
+
+libgeometry.a$O:
+ cd libgeometry
+ mk install
+
+libgraphics.a$O:
+ cd libgraphics
+ mk install
+
+libobj.a$O:
+ cd libobj
+ mk install
+
+clean nuke:V:
+ rm -f *.[$OS] [$OS].out y.tab.? y.debug y.output $TARG
+ @{cd libgeometry; mk $target}+ @{cd libgraphics; mk $target}+ @{cd libobj; mk $target}--- /dev/null
+++ b/obj.h
@@ -1,0 +1,92 @@
+/* vertex types */
+enum {+ OBJVGeometric,
+ OBJVTexture,
+ OBJVNormal,
+ OBJVParametric,
+ OBJNVERT
+};
+/* element types */
+enum {+ OBJEPoint,
+ OBJELine,
+ OBJEFace,
+ OBJECurve,
+ OBJECurve2,
+ OBJESurface
+};
+/* grouping types */
+enum {+ OBJGGlobal,
+ OBJGSmoothing,
+ OBJGMerging
+};
+/* object hash table size */
+enum {+ OBJHTSIZE = 17
+};
+
+typedef struct OBJVertex OBJVertex;
+typedef struct OBJVertexArray OBJVertexArray;
+typedef struct OBJElem OBJElem;
+//typedef struct OBJGroup OBJGroup;
+typedef struct OBJObject OBJObject;
+typedef struct OBJ OBJ;
+
+#pragma varargck type "O" OBJ*
+
+struct OBJVertex
+{+ union {+ struct { double x, y, z, w; }; /* geometric */+ struct { double u, v, vv; }; /* texture and parametric */+ struct { double i, j, k; }; /* normal */+ };
+};
+
+struct OBJVertexArray
+{+ OBJVertex *verts;
+ int nvert;
+};
+
+struct OBJElem
+{+ int *indices;
+ int nindex;
+ int type;
+ OBJElem *next;
+};
+
+//struct OBJGroup
+//{+// char *name;
+// int type;
+// OBJElem *elem0;
+// OBJGroup *next;
+//};
+//struct OBJObject
+//{+// char *name;
+// OBJGroup *grptab[OBJHTSIZE];
+// OBJObject *next;
+//};
+
+struct OBJObject
+{+ char *name;
+ OBJElem *child;
+ OBJObject *next;
+};
+
+struct OBJ
+{+ OBJVertexArray vertdata[OBJNVERT];
+ OBJObject *objtab[OBJHTSIZE];
+};
+
+OBJ *objparse(char*);
+void objfree(OBJ*);
+
+int OBJfmt(Fmt*);
+void OBJfmtinstall(void);