ref: dc597a2c65278119b7d11f83218b860c0c5da051
parent: 5fa75a6d4b03c676112ca04cf5ff3f3ccd2f0fee
author: rodri <rgl@antares-labs.eu>
date: Tue Jun 4 14:11:11 EDT 2024
add a tangent parameter for normal mapping, and a world2model xform.
--- a/graphics.h
+++ b/graphics.h
@@ -87,6 +87,7 @@
Color c; /* shading color */
Point2 uv; /* texture coordinate */
Material *mtl;
+ Point3 tangent;
/* TODO it'd be neat to use a dynamic hash table instead */
Vertexattr *attrs; /* attributes (aka varyings) */
@@ -116,6 +117,7 @@
int type;
Vertex v[3];
Material *mtl;
+ Point3 tangent; /* used for normal mapping */
};
struct Model
@@ -123,7 +125,6 @@
Primitive *prims;
ulong nprims;
Memimage *tex; /* texture map */
- Memimage *nor; /* normals map */
Material *materials;
ulong nmaterials;
};
@@ -290,6 +291,7 @@
Point3 viewport2vcs(Camera*, Point3);
Point3 vcs2world(Camera*, Point3);
Point3 viewport2world(Camera*, Point3);
+Point3 world2model(Entity*, Point3);
void perspective(Matrix3, double, double, double, double);
void orthographic(Matrix3, double, double, double, double, double, double);
--- a/render.c
+++ b/render.c
@@ -351,10 +351,6 @@
p[np].v[0].p = clip2ndc(p[np].v[0].p);
p[np].v[1].p = clip2ndc(p[np].v[1].p);
- /* culling */
-// if(isfacingback(p[np]))
-// goto skiptri2;
-
p[np].v[0].p = ndc2viewport(params->fb, p[np].v[0].p);
p[np].v[1].p = ndc2viewport(params->fb, p[np].v[1].p);
@@ -375,7 +371,6 @@
task->p.v[1] = dupvertex(&p[np].v[1]);
sendp(taskchans[i], task);
}
-//skiptri2:
delvattrs(&p[np].v[0]);
delvattrs(&p[np].v[1]);
}
@@ -386,6 +381,7 @@
p[0].v[i].mtl = p->mtl;
p[0].v[i].attrs = nil;
p[0].v[i].nattrs = 0;
+ p[0].v[i].tangent = p->tangent;
vsp.v = &p[0].v[i];
vsp.idx = i;
--- a/scene.c
+++ b/scene.c
@@ -277,6 +277,23 @@
p->v[idx].uv = Pt2(v->u, v->v, 1);
}
}
+ if(p->v[0].uv.w != 0){+ Point3 e0, e1;
+ Point2 Δuv0, Δuv1;
+ double det;
+
+ e0 = subpt3(p->v[1].p, p->v[0].p);
+ e1 = subpt3(p->v[2].p, p->v[0].p);
+ Δuv0 = subpt2(p->v[1].uv, p->v[0].uv);
+ Δuv1 = subpt2(p->v[2].uv, p->v[0].uv);
+
+ det = Δuv0.x * Δuv1.y - Δuv1.x * Δuv0.y;
+ det = det == 0? 0: 1.0/det;
+ p->tangent.x = det*(Δuv1.y * e0.x - Δuv0.y * e1.x);
+ p->tangent.y = det*(Δuv1.y * e0.y - Δuv0.y * e1.y);
+ p->tangent.z = det*(Δuv1.y * e0.z - Δuv0.y * e1.z);
+ p->tangent = normvec3(p->tangent);
+ }
if(neednormal){/* TODO build a list of per-vertex normals earlier */
n = normvec3(crossvec3(subpt3(p->v[1].p, p->v[0].p), subpt3(p->v[2].p, p->v[0].p)));
@@ -316,11 +333,12 @@
return;
if(m->tex != nil)
freememimage(m->tex);
- if(m->nor != nil)
- freememimage(m->nor);
if(m->nmaterials > 0){- while(m->nmaterials--)
+ while(m->nmaterials--){+ freememimage(m->materials[m->nmaterials].diffusemap);
+ freememimage(m->materials[m->nmaterials].normalmap);
free(m->materials[m->nmaterials].name);
+ }
free(m->materials);
}
if(m->nprims > 0)
--- a/xform.c
+++ b/xform.c
@@ -139,6 +139,12 @@
return vcs2world(c, viewport2vcs(c, p));
}
+Point3
+world2model(Entity *e, Point3 p)
+{+ return rframexform3(p, *e);
+}
+
void
perspective(Matrix3 m, double fovy, double a, double n, double f)
{