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gallium/docs: Did somebody call for a table?

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Corbin Simpson 2010-02-02 12:44:22 -08:00
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commit 516e7159ae
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src/gallium/docs/source/tgsi.rst
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@ -1449,24 +1449,34 @@ Texture Sampling and Texture Formats
This table shows how texture image components are returned as (x,y,z,w)
tuples by TGSI texture instructions, such as TEX, TXD, and TXP.
For reference, OpenGL and Direct3D convensions are shown as well::
For reference, OpenGL and Direct3D convensions are shown as well.
Texture Components Gallium OpenGL DX9
---------------------------------------------------------
R,G,B,A (R,G,B,A) (R,G,B,A) (R,G,B,A)
R,G,B (R,G,B,1) (R,G,B,1) (R,G,B,1)
R,G tbd (R,G,0,1) (R,G,1,1)
R tbd (R,0,0,1) (R,1,1,1)
A (0,0,0,A) (0,0,0,A) (0,0,0,A)
L (L,L,L,1) (L,L,L,1) (L,L,L,1)
LA (L,L,L,A) (L,L,L,A) (L,L,L,A)
I (I,I,I,I) (I,I,I,I) n/a
UV tbd (0,0,0,1)* (U,V,1,1)
Z tbd (Z,Z,Z,Z) or (0,Z,0,1)
(Z,Z,Z,1) or
(0,0,0,Z)**
+--------------------+--------------+--------------------+--------------+
| Texture Components | Gallium | OpenGL | Direct3D 9 |
+====================+==============+====================+==============+
| R | XXX TBD | (r, 0, 0, 1) | (r, 1, 1, 1) |
+--------------------+--------------+--------------------+--------------+
| RG | XXX TBD | (r, g, 0, 1) | (r, g, 1, 1) |
+--------------------+--------------+--------------------+--------------+
| RGB | (r, g, b, 1) | (r, g, b, 1) | (r, g, b, 1) |
+--------------------+--------------+--------------------+--------------+
| RGBA | (r, g, b, a) | (r, g, b, a) | (r, g, b, a) |
+--------------------+--------------+--------------------+--------------+
| A | (0, 0, 0, a) | (0, 0, 0, a) | (0, 0, 0, a) |
+--------------------+--------------+--------------------+--------------+
| L | (l, l, l, 1) | (l, l, l, 1) | (l, l, l, 1) |
+--------------------+--------------+--------------------+--------------+
| LA | (l, l, l, a) | (l, l, l, a) | (l, l, l, a) |
+--------------------+--------------+--------------------+--------------+
| I | (i, i, i, i) | (i, i, i, i) | N/A |
+--------------------+--------------+--------------------+--------------+
| UV | XXX TBD | (0, 0, 0, 1) | (u, v, 1, 1) |
| | | [#envmap-bumpmap]_ | |
+--------------------+--------------+--------------------+--------------+
| Z | XXX TBD | (z, z, z, z) | (0, z, 0, 1) |
| | | [#depth-tex-mode]_ | |
+--------------------+--------------+--------------------+--------------+
Footnotes:
* per http://www.opengl.org/registry/specs/ATI/envmap_bumpmap.txt
** depends on GL_DEPTH_TEXTURE_MODE state
.. [#envmap-bumpmap] http://www.opengl.org/registry/specs/ATI/envmap_bumpmap.txt
.. [#depth-tex-mode] Z may be (z, z, z, 1) or (0, 0, 0, z) also; it changes
depending on GL_DEPTH_TEXTURE_MODE state.