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    • Marcin Ślusarz's avatar
      st/mesa: fix transform feedback of unsubscripted gl_ClipDistance array · 7e63b613
      Marcin Ślusarz authored
      gl_ClipDistance needs special treatment in form of lowering pass
      which transforms gl_ClipDistance representation from float[] to
      vec4[]. There are 2 implementations - at glsl linker level (enabled
      by LowerClipDistance option) and at glsl_to_tgsi level (enabled
      unconditionally for gallium drivers). Second implementation is
      incomplete - it does not take into account transform feedback (see
      commit 642e5b41 "mesa: Fix transform
      feedback of unsubscripted gl_ClipDistance array" for details).
      
      There are 2 possible fixes:
      - adding transform feedback support into glsl_to_tgsi version
      - ripping gl_ClipDistance support from glsl_to_tgsi and enabling
        gl_ClipDistance lowering on glsl linker side
      
      This patch implements 2nd option. All it does is:
      - reverts most of the commit 59be6916
        "st/mesa: add support for gl_ClipDistance"
      - changes LowerClipDistance to true
      
      Fixes Piglit tests "EXT_transform_feedback/builtin-varyings
      gl_ClipDistance[{2,3,4,5,6,7,8}]-no-subscript" at least on nv50
      and evergreen cards.
      7e63b613
  24. 19 Jun, 2012 1 commit
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  27. 23 Apr, 2012 2 commits