ref: 6eab9793d68feb3282714083b355d38c6c36400b
parent: 423422e4ea9f28763b3971ce4d034dce3fd5f9a3
author: rodri <rgl@antares-labs.eu>
date: Wed Aug 7 07:50:59 EDT 2024
doc: new content.
--- a/doc/libgraphics.ms
+++ b/doc/libgraphics.ms
@@ -30,10 +30,25 @@
.NH
The scene
.PP
-A scene is a container, represented as a graph, that hosts the
-entities that make up the world. Each of these entities has a model
-made out of a series of meshes, which in turn are made out of
-geometric primitives (only
+.P1
+struct Scene
+{+ char *name;
+ Entity ents;
+ ulong nents;
+ Cubemap *skybox;
+
+ void (*addent)(Scene*, Entity*);
+ void (*delent)(Scene*, Entity*);
+};
+.P2
+.PP
+A
+.I scene
+is a container, represented as a graph, that hosts the entities that
+make up the world. Each of these entities has a model made out of a
+series of meshes, which in turn are made out of geometric primitives
+(only
.I points ,
.I lines
and
@@ -40,6 +55,7 @@
.I triangles
are supported). Each model also stores a list of materials.
.PP
+.KS
.PS
.ps 7
boxwid = 0.5
@@ -62,16 +78,64 @@
.ps 10
.PE
.FI "The scene graph."
+.KE
.NH 2
Entities
+.PP
+.P1
+struct Entity
+{+ RFrame3;
+ char *name;
+ Model *mdl;
+
+ Entity *prev, *next;
+};
+.P2
+.PP
+.I Entities
+represent physical objects in the scene.
.NH 2
Models
+.PP
+.P1
+struct Model
+{+ Primitive *prims;
+ ulong nprims;
+ Material *materials;
+ ulong nmaterials;
+};
+.P2
.NH 2
Meshes
.NH 2
Primitives
+.PP
+.P1
+struct Primitive
+{+ int type;
+ Vertex v[3];
+ Material *mtl;
+ Point3 tangent; /* used for normal mapping */
+};
+.P2
.NH 2
Materials
+.PP
+.P1
+struct Material
+{+ char *name;
+ Color ambient;
+ Color diffuse;
+ Color specular;
+ double shininess;
+ Texture *diffusemap;
+ Texture *normalmap;
+};
+.P2
.NH
Cameras
.PP
@@ -95,7 +159,7 @@
spawned with a call to
.CW initgraphics ,
each representing a stage of the pipeline:
-.IP •
+.IP "S1:"
The
.B renderer
process, the root of the tree, waits on a
@@ -107,40 +171,7 @@
.CW Entity
individually to the
entityproc.
-.IP •
-The
-.B entityproc
-receives an entity and splits its geometry equitatively among the
-tilers, sending a batch for each of them to process.
-.IP •
-Next, each
-.B tiler
-gets to work on their subset of the geometry (potentially in
-parallel)—see
-.B "Figure 3" .
-They walk the list of primitives, then for each of them
-apply the
-.B "vertex shader"
-to its vertices (which expects clip space coordinates in return),
-perform frustum culling and clipping, back-face culling, and then
-project them into the viewport (screen space). Following this step,
-they build a bounding box, used to allocate each primitive into a
-rasterization bucket, or
-.B tile ,
-managed by one of the rasterizers; as illustrated in
-.B "Figure 4" .
-If it spans multiple tiles, it will be copied and sent to each of
-them.
-.IP •
-Finally, the
-.B rasterizers
-receive the primitive in screen space, slice it to fit their tile, and
-apply a rasterization routine based on its type. For each of the pixels, a
-.B "depth test"
-is performed, discarding fragments that are further away. Then a
-.B "fragment shader"
-is applied and the result written to the framebuffer after blending.
-.PP
+.KS
.PS
.ps 7
circlerad = 0.3
@@ -188,6 +219,32 @@
.ps 10
.PE
.FI "The rendering graph for a \fB2n\fR processor machine."
+.KE
+.IP "S2:"
+The
+.B entityproc
+receives an entity and splits its geometry equitatively among the
+tilers, sending a batch for each of them to process.
+.IP "S3:"
+Next, each
+.B tiler
+gets to work on their subset of the geometry (potentially in
+parallel)—see
+.B "Figure 3" .
+They walk the list of primitives, then for each of them
+apply the
+.B "vertex shader"
+to its vertices (which expects clip space coordinates in return),
+perform frustum culling and clipping, back-face culling, and then
+project them into the viewport (screen space). Following this step,
+they build a bounding box, used to allocate each primitive into a
+rasterization bucket, or
+.B tile ,
+managed by one of the rasterizers; as illustrated in
+.B "Figure 4" .
+If it spans multiple tiles, it will be copied and sent to each of
+them.
+.KS
.PS
.ps 7
Tiles: [
@@ -219,6 +276,18 @@
.ps 10
.PE
.FI "Per tile rasterizers."
+.KE
+.IP "S4:"
+Finally, the
+.B rasterizers
+receive the primitive in screen space, slice it to fit their tile, and
+apply a rasterization routine based on its type. For each of the pixels, a
+.B "depth test"
+is performed, discarding fragments that are further away. Then a
+.B "fragment shader"
+is applied and the result written to the framebuffer after blending.
+.PP
+.KS
.PS
.ps 7
Tiles: [
@@ -252,10 +321,12 @@
.ps 10
.PE
.FI "Raster task scheduling."
+.KE
.NH
Frames of reference
.PP
Frames are right-handed throughout every stage.
+.KS
.PS
.ps 7
RFrame: [
@@ -275,6 +346,7 @@
.ps 10
.PE
.FI "Example right-handed rframe."
+.KE
.NH
Viewports
.PP
@@ -287,12 +359,18 @@
.CW draw
or
.CW memdraw
-methods. As of now, the only feature available is upscaling, which
+methods. So far the only feature available is upscaling, which
includes user-defined filters for specific ratios, such as the family
of pixel art filters
.I Scale[234]x ,
used for 2x2, 3x3 and 4x4 scaling
-.I [?] . respectively
+.I [REF01] . respectively
+Users control it with calls to the viewport's
+.CW setscale
+and
+.CW setscalefilter
+methods.
+.KS
.PS
.ps 7
View: [
@@ -310,8 +388,9 @@
.ps 10
.PE
.FI "Illustration of a 3:2 viewport."
+.KE
.SH
References
.PP
-.IP [?]
+.IP [REF01]
https://www.scale2x.it/
binary files a/doc/libgraphics.pdf b/doc/libgraphics.pdf differ
--- a/doc/libgraphics.ps
+++ b/doc/libgraphics.ps
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10 /LucidaSansUnicode00 f
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7 /LucidaSansUnicode00 f
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10 /LucidaSansUnicode00 f
-(: Raster task scheduling.) 2495 5448 w
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10 /LucidaSans-Demi f
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10 /LucidaSansUnicode00 f
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+cleartomark
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7 /LucidaSansUnicode00 f
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10 /LucidaSans-Demi f
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10 /LucidaSansUnicode00 f
-(: Example right-handed rframe.) 2319 7212 w
-(July 23, 2024) 2556 7680 w
-cleartomark
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10 /LucidaSans-Demi f
-(5.) 720 840 w
-(Viewports) 873 840 w
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10 /LucidaSansUnicode00 f
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10 /LucidaSans-Italic f
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-(a) 1673 996 w
-(sort) 1774 996 w
-(of) 2010 996 w
-(virtual) 2154 996 w
-(framebuffer,) 2505 996 w
-(a) 3161 996 w
-(device) 3262 996 w
-(that) 3615 996 w
-(lets) 3852 996 w
-(users) 4071 996 w
-(configure) 4378 996 w
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-(they) 940 1116 w
-(visualize) 1183 1116 w
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-(framebuffer,) 1730 1116 w
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10 /LucidaSans-Italic f
-(image) 3779 1116 w
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10 /LucidaSansUnicode00 f
-(\(6\)) 4076 1116 w
-(after) 4240 1116 w
-(a) 4501 1116 w
-(call) 4591 1116 w
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10 /LucidaTypewriter f
-(draw) 720 1236 w
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10 /LucidaSansUnicode00 f
-(or) 1046 1236 w
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10 /LucidaTypewriter f
-(memdraw) 1187 1236 w
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10 /LucidaSansUnicode00 f
-(methods.) 1730 1236 w
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-(of) 2415 1236 w
-(now,) 2552 1236 w
-(the) 2823 1236 w
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-(feature) 3260 1236 w
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-(upscaling,) 4224 1236 w
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10 /LucidaSans-Italic f
-(Scale[234]x) 720 1476 w
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10 /LucidaSansUnicode00 f
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10 /LucidaSans-Italic f
-([?]) 3621 1476 w
+([REF01]) 3780 2964 w
10 /LucidaSansUnicode00 f
-(.) 3733 1476 w
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7 /LucidaSansUnicode00 f
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gsave
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gsave eofill grestore 0 setgray stroke
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10 /LucidaSans-Demi f
-(Figure 6) 1932 3348 w
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10 /LucidaSansUnicode00 f
-(: Illustration of a 3:2 viewport.) 2354 3348 w
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10 /LucidaSans-Demi f
-(References) 720 3588 w
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10 /LucidaSansUnicode00 f
-([?]) 720 3780 w
-(https://www.scale2x.it/) 970 3780 w
-(July 23, 2024) 2556 7680 w
+([REF01]https://www.scale2x.it/) 720 5388 w
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cleartomark
showpage
saveobj restore
-%%EndPage: 4 4
+%%EndPage: 5 5
%%Trailer
done
%%DocumentFonts: LucidaSansUnicode20 LucidaSansUnicode00 LucidaSans-Demi LucidaSans-Italic LucidaTypewriter
-%%Pages: 4
+%%Pages: 5