This series adds a bunch of workarounds to enable ARB_texture_gather (in its more restrictive form) on Gen6 hardware.
These are necessary because Gen6's gather4 instruction doesn't work correctly with integer or unsigned integer formats. The approach is: * For 32-bit wide formats, pretend the surface is FLOAT, and reinterpret the bits as INT/UINT. This requires only a surface format override; nothing in the shader. * For 8- and 16-bit wide formats, pretend the surface is UNORM, and recover the appropriate unsigned integer value by multiplying up, and then converting to INT/UINT. If INT is required, then fix the sign extension of the value by the usual SHL/ASR method. This now passes all the applicable ARB_texture_gather piglit tests. _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/mesa-dev
