Mesa (master): gallium: add support for layered rendering
Roland Scheidegger
sroland at kemper.freedesktop.org
Sat Jun 1 18:04:20 UTC 2013
Module: Mesa
Branch: master
Commit: 6b53e2b0380ce1617402217cb77d5670a44c3fb5
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=6b53e2b0380ce1617402217cb77d5670a44c3fb5
Author: Roland Scheidegger <sroland at vmware.com>
Date: Sat Jun 1 20:02:17 2013 +0200
gallium: add support for layered rendering
Since pipe_surface already has all the necessary fields no interface
changes are necessary except adding a new shader semantic value
(TGSI_SEMANTIC_LAYER).
(Note that what GL knows as "gl_Layer" variable d3d10 is naming
"RENDER_TARGET_ARRAY_INDEX".)
v2: drop cap bit (just tied to geometry shader), add docs.
---
src/gallium/docs/source/tgsi.rst | 22 ++++++++++++++++++++--
src/gallium/include/pipe/p_shader_tokens.h | 3 ++-
2 files changed, 22 insertions(+), 3 deletions(-)
diff --git a/src/gallium/docs/source/tgsi.rst b/src/gallium/docs/source/tgsi.rst
index 3af1fb7..9265271 100644
--- a/src/gallium/docs/source/tgsi.rst
+++ b/src/gallium/docs/source/tgsi.rst
@@ -2400,14 +2400,32 @@ Edge flags are used to control which lines or points are actually
drawn when the polygon mode converts triangles/quads/polygons into
points or lines.
+
TGSI_SEMANTIC_STENCIL
-""""""""""""""""""""""
+"""""""""""""""""""""
-For fragment shaders, this semantic label indicates than an output
+For fragment shaders, this semantic label indicates that an output
is a writable stencil reference value. Only the Y component is writable.
This allows the fragment shader to change the fragments stencilref value.
+TGSI_SEMANTIC_VIEWPORT_INDEX
+""""""""""""""""""""""""""""
+
+For geometry shaders, this semantic label indicates that an output
+contains the index of the viewport (and scissor) to use.
+Only the X value is used.
+
+
+TGSI_SEMANTIC_LAYER
+"""""""""""""""""""
+
+For geometry shaders, this semantic label indicates that an output
+contains the layer value to use for the color and depth/stencil surfaces.
+Only the X value is used. (Also known as rendertarget array index.)
+
+
+
Declaration Interpolate
^^^^^^^^^^^^^^^^^^^^^^^
diff --git a/src/gallium/include/pipe/p_shader_tokens.h b/src/gallium/include/pipe/p_shader_tokens.h
index b33cf1d..c984d50 100644
--- a/src/gallium/include/pipe/p_shader_tokens.h
+++ b/src/gallium/include/pipe/p_shader_tokens.h
@@ -165,7 +165,8 @@ struct tgsi_declaration_interp
#define TGSI_SEMANTIC_TEXCOORD 19 /**< texture or sprite coordinates */
#define TGSI_SEMANTIC_PCOORD 20 /**< point sprite coordinate */
#define TGSI_SEMANTIC_VIEWPORT_INDEX 21 /**< viewport index */
-#define TGSI_SEMANTIC_COUNT 22 /**< number of semantic values */
+#define TGSI_SEMANTIC_LAYER 22 /**< layer (rendertarget index) */
+#define TGSI_SEMANTIC_COUNT 23 /**< number of semantic values */
struct tgsi_declaration_semantic
{
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