diff options
| author | Paul Berry <[email protected]> | 2011-08-11 20:58:21 -0700 |
|---|---|---|
| committer | Paul Berry <[email protected]> | 2011-09-23 13:28:43 -0700 |
| commit | c06e32596735074536b0e613cbddb1c5fd7b367a (patch) | |
| tree | e062d9b19ebbab5dd27926260f67afb4bcb27390 /src/mesa/main | |
| parent | cc81eb09b928389f926b3512c18b3298777d2928 (diff) | |
glsl: Implement a lowering pass for gl_ClipDistance.
In i965 GEN6+ (and I suspect most other hardware), gl_ClipDistance
needs to be laid out as a pair of vec4's (the first containing clip
distances 0-3, and the second containing clip distances 4-7).
However, it is declared in GLSL as an array of 8 floats.
This lowering pass acts at the GLSL level, modifying the declaration
of gl_ClipDistance so that it is an array of vec4's rather than an
array of floats, and renaming it to gl_ClipDistanceMESA. In addition,
it modifies all accesses to the array so that they access the
appropiate component of one of the vec4's.
Since some hardware may not internally represent gl_ClipDistance as a
pair of vec4's, this lowering pass is optional. To enable it, set the
LowerClipDistance flag in gl_shader_compiler_options to true.
Reviewed-by: Kenneth Graunke <[email protected]>
Diffstat (limited to 'src/mesa/main')
| -rw-r--r-- | src/mesa/main/mtypes.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h index 6efd9559651..74e7e2adf68 100644 --- a/src/mesa/main/mtypes.h +++ b/src/mesa/main/mtypes.h @@ -2235,6 +2235,7 @@ struct gl_shader_compiler_options GLboolean EmitNoMainReturn; /**< Emit CONT/RET opcodes? */ GLboolean EmitNoNoise; /**< Emit NOISE opcodes? */ GLboolean EmitNoPow; /**< Emit POW opcodes? */ + GLboolean LowerClipDistance; /**< Lower gl_ClipDistance from float[8] to vec4[2]? */ /** * \name Forms of indirect addressing the driver cannot do. |