softpipe: start adding gather support (v2)

Graphics / Mesa 3D Graphics Library / Mesa - Dave Airlie [redhat.com] - 19 May 2015 21:32 UTC

This adds both ARB_texture_gather and the enhanced gather for ARB_gpu_shader5.

This passes all the piglit tests, it relies on the GLSL lowering pass to make textureGatherOffsets work.

v2: use inline to get gather component (Brian) fix function name, add asserts (Brian)

55a7b51 softpipe: start adding gather support (v2)
src/gallium/drivers/softpipe/sp_screen.c | 5 +-
src/gallium/drivers/softpipe/sp_tex_sample.c | 286 ++++++++++++++++++--------
src/gallium/drivers/softpipe/sp_tex_sample.h | 2 +
3 files changed, 210 insertions(+), 83 deletions(-)

Upstream: cgit.freedesktop.org

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