diff options
| author | Kenneth Graunke <[email protected]> | 2014-02-23 21:59:24 -0800 |
|---|---|---|
| committer | Kenneth Graunke <[email protected]> | 2014-03-04 17:21:06 -0800 |
| commit | 23e81b93bbe3966a842de507988eeaa7342e12ca (patch) | |
| tree | bda28d42e69a723cf1fd10745d2ff177339202a5 /src/mesa/main/extensions.c | |
| parent | 5f23a2d9c2df7e7b860246be37b495e7fbea76ca (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 <[email protected]>
Reviewed-by: Matt Turner <[email protected]>
Reviewed-by: Eric Anholt <[email protected]>
Diffstat (limited to 'src/mesa/main/extensions.c')
| -rw-r--r-- | src/mesa/main/extensions.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/src/mesa/main/extensions.c b/src/mesa/main/extensions.c index c46d70b2055..a72284c9a30 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 }, |