llvmpipe: ARB_shader_draw_parameters support
add ARB_shader_draw_parameters, I need some bits of this for vulkan, so may as well add it here.
marked WIP so I can update the piglit results.
Edited by Dave Airlie
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add ARB_shader_draw_parameters, I need some bits of this for vulkan, so may as well add it here.
marked WIP so I can update the piglit results.