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authorPaul Berry <[email protected]>2011-08-11 20:58:21 -0700
committerPaul Berry <[email protected]>2011-09-23 13:28:43 -0700
commitc06e32596735074536b0e613cbddb1c5fd7b367a (patch)
treee062d9b19ebbab5dd27926260f67afb4bcb27390 /src/gallium
parentcc81eb09b928389f926b3512c18b3298777d2928 (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]>
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