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authorKenneth Graunke <kenneth@whitecape.org>2014-02-23 21:59:24 -0800
committerKenneth Graunke <kenneth@whitecape.org>2014-03-04 17:21:06 -0800
commit23e81b93bbe3966a842de507988eeaa7342e12ca (patch)
treebda28d42e69a723cf1fd10745d2ff177339202a5 /src/mesa/main/extensions.c
parent5f23a2d9c2df7e7b860246be37b495e7fbea76ca (diff)
mesa: Add core API support for GL_ARB_stencil_texturing (from 4.3).
While the GL_ARB_stencil_texturing extension does not allow the creation of stencil textures, it does allow shaders to sample stencil values stored in packed depth/stencil textures. Specifically, applications can call glTexParameter* with a pname of GL_DEPTH_STENCIL_TEXTURE_MODE and value of either GL_DEPTH_COMPONENT or GL_STENCIL_INDEX to select which component they wish to sample. The default value is GL_DEPTH_COMPONENT (for traditional depth sampling). Shaders should use an unsigned integer sampler (presumably usampler2D) to access stencil data. Otherwise, results are undefined. Using shadow samplers with GL_STENCIL_INDEX selected also is undefined behavior. This patch creates a new gl_texture_object field, StencilSampling, to indicate that stencil should be sampled rather than depth. (I chose to use a boolean since I figured it would be more convenient for drivers.) It also introduces the [Get]TexParameter code to get and set the value, and of course the extension plumbing. v2: Also consider textures incomplete when sampling stencil with non-NEAREST min/mag filters (caught by Eric Anholt). Signed-off-by: Kenneth Graunke <kenneth@whitecape.org> Reviewed-by: Matt Turner <mattst88@gmail.com> Reviewed-by: Eric Anholt <eric@anholt.net>
Diffstat (limited to 'src/mesa/main/extensions.c')
-rw-r--r--src/mesa/main/extensions.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/mesa/main/extensions.c b/src/mesa/main/extensions.c
index c46d70b205..a72284c9a3 100644
--- a/src/mesa/main/extensions.c
+++ b/src/mesa/main/extensions.c
@@ -138,6 +138,7 @@ static const struct extension extension_table[] = {
{ "GL_ARB_shading_language_packing", o(ARB_shading_language_packing), GL, 2011 },
{ "GL_ARB_shading_language_420pack", o(ARB_shading_language_420pack), GL, 2011 },
{ "GL_ARB_shadow", o(ARB_shadow), GLL, 2001 },
+ { "GL_ARB_stencil_texturing", o(ARB_stencil_texturing), GL, 2012 },
{ "GL_ARB_sync", o(ARB_sync), GL, 2003 },
{ "GL_ARB_texture_border_clamp", o(ARB_texture_border_clamp), GLL, 2000 },
{ "GL_ARB_texture_buffer_object", o(ARB_texture_buffer_object), GLC, 2008 },