doc: add some schematics about the overall architecture.

3 files changed, 715 insertions, 57 deletions

diff --git a/doc/libgraphics.ms b/doc/libgraphics.ms
index 87a23a7..31a44af 100644
--- a/doc/libgraphics.ms
+++ b/doc/libgraphics.ms
@@ -2,33 +2,152 @@
 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
+.AB
+To be determined.
+.AE
+.SH
+Rendering graph
 .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.
+.PS
+.ps 7
+circlerad = 0.3
+moveht = 0.1
+box "Renderjob"
+arrow
+R: circle "renderer"
+arrow
+E: circle "entityproc"
+move
+Tiler: [
+	down
+	T0: circle "tiler 0"
+	move
+	T1: circle "tiler 1"
+	move
+	Td: circle "…"
+	move
+	Tn: circle "tiler n"
+]
+move
+Raster: [
+	down
+	R0: circle "rasterizer 0"
+	move
+	R1: circle "rasterizer 1"
+	move
+	Rd: circle "…"
+	move
+	Rn: circle "rasterizer n"
+]
+arrow from E to Tiler.T0 chop
+arrow from E to Tiler.T1 chop
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+arrow from Tiler.T0 to Raster.R1 chop
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+arrow from Tiler.T1 to Raster.R1 chop
+arrow from Tiler.T1 to Raster.Rd chop
+arrow from Tiler.T1 to Raster.Rn chop
+.ps 10
+.PE
+.B "Figure 1" :
+For a
+.B 2(n+1)
+processor machine.
+.SH
+The scene
+.PP
+.PS
+.ps 7
+boxwid = 0.5
+boxht = 0.2
+linewid = 0.1
+lineht = 0.2
+box "Scene"
+down; line from last box.s; right; line
+box "Entity"
+down; line from last box.s; right; line
+box "Model"
+down; line from last box.s; right; line
+box "Mesh"
+down; line from last box.s; right; line
+box "Primitive"
+down
+line from 2nd last line.s; line; right; line
+box "Material"
+.ps 10
+.PE
+.SH
+Tile-based rendering
+.PP
+.PS
+.ps 7
+Tiles: [
+	boxht = 0.2
+	boxwid = 1.25
+	down
+	T0: box dashed "tile 0"
+	T1: box dashed "tile 1"
+	Td: box dashed "…"
+	Tn: box dashed "tile n"
+]
+box ht last [].ht+0.1 wid last [].wid+0.1 at last []
+"Screen" rjust with .se at last [].nw - (0.1,0)
+Raster: [
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+	down
+	R0: circle "rasterizer 0"
+	move
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+line from Tiles.Td.e to Raster.Rd.w
+line from Tiles.Tn.e to Raster.Rn.w
+.ps 10
+.PE
+.B "Figure 2" :
+Per tile rasterizers.
+.PS
+.ps 7
+Tiles: [
+	boxht = 0.2
+	boxwid = 1.25
+	down
+	T0: box dashed "0"
+	T1: box dashed "1"
+	Td: box dashed "…"
+	Tn: box dashed "n"
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+line to 1st line
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+"Screen" rjust with .se at last [].nw - (0.1,0)
+Raster: [
+	moveht = 0.1
+	down
+	R0: circle "rasterizer 0"
+	move
+	R1: circle "rasterizer 1"
+	move
+	Rd: circle "…"
+	move
+	Rn: circle "rasterizer n"
+] with .w at Tiles.e + (0.5,0)
+arrow dashed from Tiles.T0.e to Raster.R0.w
+arrow from Tiles.T1.e to Raster.R1.w
+arrow from Tiles.Td.e to Raster.Rd.w
+arrow from Tiles.Tn.e to Raster.Rn.w
+.ps 10
+.PE
+.B "Figure 3" :
+Raster task scheduling.
diff --git a/doc/libgraphics.pdf b/doc/libgraphics.pdf
index 0291710..775d825 100644
--- a/doc/libgraphics.pdf
+++ b/doc/libgraphics.pdf
diff --git a/doc/libgraphics.ps b/doc/libgraphics.ps
index 1a566f7..081c5d0 100644
--- a/doc/libgraphics.ps
+++ b/doc/libgraphics.ps
@@ -191,7 +191,7 @@
 	/braceleftbt		[203 490]
 	/bracketrightex		[220 -125 500 0]
 	/radical		[0 0 550 0]
-	/radicalex		[-50 0 500 0]
+	/radicalex		[-50 0 500 1]
 	/parenleftex		[-20 -170 0 0]
 	/integral		[100 -50 500 0]
 	/infinity		[10 -75 730 0]
@@ -202,6 +202,82 @@
 	/endash			[7 90 650 0]
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+%
+
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+/savematrix matrix def
+
+/Dl {
+	inpath
+		{neg lineto pop pop}
+		{newpath neg moveto neg lineto stroke}
+	ifelse
+} bind def
+
+/De {
+	/y1 exch 2 div def
+	/x1 exch 2 div def
+	/savematrix savematrix currentmatrix def
+	neg exch x1 add exch translate
+	x1 y1 scale
+	0 0 1 0 360
+	inpath
+		{1 0 moveto arc savematrix setmatrix}
+		{newpath arc savematrix setmatrix stroke}
+	ifelse
+} bind def
+
+/Da {
+	/dy2 exch def
+	/dx2 exch def
+	/dy1 exch def
+	/dx1 exch def
+	dy1 add neg exch dx1 add exch
+	dx1 dx1 mul dy1 dy1 mul add sqrt
+	dy1 dx1 neg atan
+	dy2 neg dx2 atan
+	inpath
+		{arc}
+		{newpath arc stroke}
+	ifelse
+} bind def
+
+/DA {
+	/dy2 exch def
+	/dx2 exch def
+	/dy1 exch def
+	/dx1 exch def
+	dy1 add neg exch dx1 add exch
+	dx1 dx1 mul dy1 dy1 mul add sqrt
+	dy1 dx1 neg atan
+	dy2 neg dx2 atan
+	inpath
+		{arcn}
+		{newpath arcn stroke}
+	ifelse
+} bind def
+
+/Ds {
+	/y2 exch def
+	/x2 exch def
+	/y1 exch def
+	/x1 exch def
+	/y0 exch def
+	/x0 exch def
+	x0 5 x1 mul add 6 div
+	y0 5 y1 mul add -6 div
+	x2 5 x1 mul add 6 div
+	y2 5 y1 mul add -6 div
+	x1 x2 add 2 div
+	y1 y2 add -2 div
+	inpath
+		{curveto}
+		{newpath x0 x1 add 2 div y0 y1 add -2 div moveto curveto stroke}
+	ifelse
+} bind def
+%
 % Tries to round clipping path dimensions, as stored in array pagebbox, so they
 % match one of the known sizes in the papersizes array. Lower left coordinates
 % are always set to 0.
@@ -543,41 +619,504 @@ setup
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