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Enable _mesa_PushAttrib() and _mesa_PopAttrib() to handle GL_DEPTH_CLAMP_NEAR_AMD and GL_DEPTH_CLAMP_FAR_AMD tokens. Remove DepthClamp, because DepthClampNear + DepthClampFar replaces it, as suggested by Marek Olsak. Driver that enables AMD_depth_clamp_separate will only ever look at DepthClampNear and DepthClampFar, as suggested by Ian Romanick. v2: 1) Remove unnecessary parentheses (Marek Olsak) 2) if AMD_depth_clamp_separate is unsupported, TEST_AND_UPDATE GL_DEPTH_CLAMP only (Marek Olsak) 3) Clamp against near and far plane separately (Marek Olsak) 4) Clip point separately for near and far Z clipping plane (Marek Olsak) v3: Clamp raster position zw to the range [min(n,f), 0] for near plane and [0, max(n,f)] for far plane (Marek Olsak) v4: Use MIN2 and MAX2 instead of CLAMP (Marek Olsak) Signed-off-by: Sagar Ghuge <sagar.ghuge@intel.com> Reviewed-by: Ian Romanick <ian.d.romanick@intel.com> Reviewed-by: Marek Olšák <marek.olsak@amd.com>
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