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authorKenneth Graunke <[email protected]>2014-02-23 21:59:24 -0800
committerKenneth Graunke <[email protected]>2014-03-04 17:21:06 -0800
commit23e81b93bbe3966a842de507988eeaa7342e12ca (patch)
treebda28d42e69a723cf1fd10745d2ff177339202a5 /docs/GL3.txt
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 <[email protected]> Reviewed-by: Matt Turner <[email protected]> Reviewed-by: Eric Anholt <[email protected]>
Diffstat (limited to 'docs/GL3.txt')
-rw-r--r--docs/GL3.txt2
1 files changed, 1 insertions, 1 deletions
diff --git a/docs/GL3.txt b/docs/GL3.txt
index 755a89c0ff9..f0e95c563e5 100644
--- a/docs/GL3.txt
+++ b/docs/GL3.txt
@@ -158,7 +158,7 @@ GL 4.3:
GL_ARB_robust_buffer_access_behavior not started
GL_ARB_shader_image_size not started
GL_ARB_shader_storage_buffer_object not started
- GL_ARB_stencil_texturing not started
+ GL_ARB_stencil_texturing API exists, no drivers
GL_ARB_texture_buffer_range DONE (nv50, nvc0, i965, r600, radeonsi)
GL_ARB_texture_query_levels DONE (i965)
GL_ARB_texture_storage_multisample DONE (all drivers that support GL_ARB_texture_multisample)