ref: 6d137698282ca2c04eff4b52ac8e69ac10164a90
parent: 5cc40b1dea29dfc40831f69c3f1a8f72a47b5d18
author: rodri <rgl@antares-labs.eu>
date: Mon Sep 9 17:33:15 EDT 2024
doc: changes. added references.
--- a/doc/libgraphics.ms
+++ b/doc/libgraphics.ms
@@ -53,7 +53,7 @@
.I lines
and
.I triangles
-are supported). Each model also stores a list of materials.
+are supported.) Each model also stores a list of materials.
.PP
.KS
.PS
@@ -139,7 +139,26 @@
.NH
Cameras
.PP
-
+.P1
+struct Camera
+{+ RFrame3; /* VCS */
+ Viewport *view;
+ Scene *scene;
+ Renderer *rctl;
+ double fov; /* vertical FOV */
+ struct {+ double n, f; /* near and far clipping planes */
+ } clip;
+ Matrix3 proj; /* VCS to clip space xform */
+ Projection projtype;
+ ulong clearcolor;
+ int cullmode;
+ int enableblend;
+ int enabledepth;
+ int enableAbuff;
+};
+.P2
.NH
The renderer
.LP
@@ -148,11 +167,13 @@
is the core of the library. It follows a
.B "retained mode"
model, which means that the user won't get a picture until the entire
-scene has been rendered. Thanks to this we can also clear and swap
-the framebuffers without their intervention, they only need to concern
-themselves with shooting and “developing” a camera.
+scene has been rendered. Thanks to this we can apply optimizations to
+make better use of the pipeline, clear and swap the framebuffers,
+and—in the future—run distributed rendering jobs, all without their
+intervention; they only need to concern themselves with shooting and
+“developing” a camera.
.LP
-It's implemented as a tree of concurrent processes connected by
+It's implemented as a tree of concurrent processes connected by buffered
.CW Channel s—as
seen in
.B "Figure 2" —,
@@ -159,20 +180,6 @@
spawned with a call to
.CW initgraphics ,
each representing a stage of the pipeline:
-.NH 2
-renderer
-.PP
-The
-.B renderer
-process, the root of the tree, waits on a
-.CW channel
-for a
-.CW Renderjob
-sent by another user process, specifying a framebuffer, a scene, a
-camera and a shader table. It walks the scene and sends each
-.CW Entity
-individually to the
-entityproc.
.KS
.PS
.ps 7
@@ -223,6 +230,20 @@
.FI "The rendering graph for a \fB2n\fR processor machine."
.KE
.NH 2
+renderer
+.PP
+The
+.B renderer
+process, the root of the tree, waits on a
+.CW channel
+for a
+.CW Renderjob
+sent by another user process, specifying a framebuffer, a scene, a
+camera and a shader table. It walks the scene and sends each
+.CW Entity
+individually to the
+entityproc.
+.NH 2
entityproc
.PP
The
@@ -289,11 +310,25 @@
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
+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.
+.QP
+Depth testing and blending can be disabled by clearing the camera's
+.CW enabledepth
+and
+.CW enableblend
+parameters, respectively. An experimental A-buffer implementation is
+also included for order-independent rendering of transparent
+primitives (OIT). If enabled, by setting the camera's
+.CW enableAbuff
+parameter, fragments will be pushed to a depth-sorted stack, waiting
+to be blended back-to-front and written to the framebuffer at the end
+of the job.
+.QE
.PP
.KS
.PS
@@ -372,7 +407,7 @@
of pixel art filters
.I Scale[234]x ,
used for 2x2, 3x3 and 4x4 scaling
-.I [REF01] . respectively
+.I [SCALE2x] . respectively
Users control it with calls to the viewport's
.CW setscale
and
@@ -400,5 +435,59 @@
.SH
References
.PP
-.IP [REF01]
+.IP [1]
https://www.scale2x.it/
+.IP [2]
+Thomas W. Crockett,
+“Design Considerations for Parallel Graphics Libraries”,
+.I
+NASA Langley Research Center, Contract Nos. NAS1-18605 and NAS1-19480, June 1994
+.IP [3]
+Thomas W. Crockett,
+“Parallel Rendering”,
+.I
+NASA Langley Research Center, Contract No. NAS1-19480, April 1995
+.IP [4]
+Thomas W. Crockett,
+“Beyond the Renderer: Software Architecture for Parallel Graphics and Visualization”,
+.I
+NASA Langley Research Center, Contract No. NAS1-19480, December 1996
+.IP [5]
+Tomas Akenine-Möller et al,
+“Real-Time Rendering”,
+.I
+4th edition, Taylor & Francis, CRC Press, 2018
+.IP [6]
+James F. Blinn, Martin E. Newell,
+“Clipping Using Homogeneous Coordinates”,
+.I
+SIGGRAPH '78: Proceedings, August 1978, pp. 245-251
+.IP [7]
+“GPU Gems” series
+.IP [8]
+“Graphics Gems” series
+.IP [9]
+Ian Stephenson,
+“Production Rendering: Design and Implementation”,
+.I
+Springer, 2005
+.IP [10]
+Paul S. Heckbert,
+“Survey of Texture Mapping”,
+.I
+IEEE Computer Graphics and Applications, Nov. 1986, pp. 56-67
+.IP [11]
+Paul S. Heckbert,
+“Fundamentals of Texture Mapping and Image Warping”,
+.I
+University of California, Berkeley, Technical Report No. UCB/CSD-89-516, June 1989
+.IP [12]
+Robert L. Cook, Loren Carpenter, Edwin Catmull
+“The REYES Image Rendering Architecture”,
+.I
+ACM Transactions on Computer Graphics, Vol. 21, No. 4, July 1987
+.IP [13]
+Bruce J. Lindbloom,
+“Accurate Color Reproduction for Computer Graphics Applications”,
+.I
+ACM Transactions on Computer Graphics, Vol. 23, No. 3, July 1989
binary files a/doc/libgraphics.pdf b/doc/libgraphics.pdf differ
--- a/doc/libgraphics.ps
+++ b/doc/libgraphics.ps
@@ -793,8 +793,8 @@
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cleartomark
showpage
saveobj restore
@@ -927,7 +927,7 @@
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10 /LucidaSans-Demi f
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10 /LucidaSans-Demi f
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cleartomark
showpage
saveobj restore
@@ -1720,7 +1585,7 @@
2070 1620 2070 1656 Dl
2070 1674 2070 1710 Dl
7 /LucidaSansUnicode00 f
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2070 1854 2106 1854 Dl
2142 1854 2178 1854 Dl
2214 1854 2250 1854 Dl
@@ -1753,7 +1618,7 @@
2070 1710 2070 1746 Dl
2070 1764 2070 1800 Dl
2070 1818 2070 1854 Dl
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2142 1998 2178 1998 Dl
2214 1998 2250 1998 Dl
@@ -1821,10 +1686,7 @@
2070 2052 2070 2088 Dl
2070 2106 2070 2142 Dl
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2034 1530 3006 1530 Dl
3006 1530 3006 2178 Dl
@@ -1843,258 +1705,812 @@
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