diff options
| author | Christoph Bumiller <[email protected]> | 2013-03-15 22:11:31 +0100 |
|---|---|---|
| committer | Christoph Bumiller <[email protected]> | 2013-03-20 12:25:21 +0100 |
| commit | 8acaf862dfeac62550514b0e46f5aa6212b08992 (patch) | |
| tree | 742186f981a608ef42f62aff6271aeec6451b7bc /src/gallium/docs/source/cso/rasterizer.rst | |
| parent | 3eaf823b9086ae400a000a1f639e74d2f2be9166 (diff) | |
gallium: add TGSI_SEMANTIC_TEXCOORD,PCOORD v3
This makes it possible to identify gl_TexCoord and gl_PointCoord
for drivers where sprite coordinate replacement is restricted.
The new PIPE_CAP_TGSI_TEXCOORD decides whether these varyings
should be hidden behind the GENERIC semantic or not.
With this patch only nvc0 and nv30 will request that they be used.
v2: introduce a CAP so other drivers don't have to bother with
the new semantic
v3: adapt to introduction gl_varying_slot enum
Diffstat (limited to 'src/gallium/docs/source/cso/rasterizer.rst')
| -rw-r--r-- | src/gallium/docs/source/cso/rasterizer.rst | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/src/gallium/docs/source/cso/rasterizer.rst b/src/gallium/docs/source/cso/rasterizer.rst index f4e24f0b438..8338243be9f 100644 --- a/src/gallium/docs/source/cso/rasterizer.rst +++ b/src/gallium/docs/source/cso/rasterizer.rst @@ -159,13 +159,18 @@ Points sprite_coord_enable ^^^^^^^^^^^^^^^^^^^ +The effect of this state depends on PIPE_CAP_TGSI_TEXCOORD ! Controls automatic texture coordinate generation for rendering sprite points. +If PIPE_CAP_TGSI_TEXCOORD is false: When bit k in the sprite_coord_enable bitfield is set, then generic input k to the fragment shader will get an automatically computed texture coordinate. +If PIPE_CAP_TGSI_TEXCOORD is true: +The bitfield refers to inputs with TEXCOORD semantic instead of generic inputs. + The texture coordinate will be of the form (s, t, 0, 1) where s varies from 0 to 1 from left to right while t varies from 0 to 1 according to the state of 'sprite_coord_mode' (see below). |