nir: Define system values for vc4's blending-lowering arguments.
In the GLSL-to-NIR conversion of VC4, I had a bit of trouble with what I was calling the "state uniforms" that I was putting into the NIR fighting with its other lowering passes. Instead of using magic uniform base numbers in the backend, follow the lead of load_user_clip_plane and just define system values for them. v2: Fix unintended change to channel_num, drop unspecified const_index value on blend_const_color_r_float. Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
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@@ -310,6 +310,15 @@ SYSTEM_VALUE(user_clip_plane, 4, 1, UCP_ID, xx, xx)
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SYSTEM_VALUE(num_work_groups, 3, 0, xx, xx, xx)
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SYSTEM_VALUE(helper_invocation, 1, 0, xx, xx, xx)
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SYSTEM_VALUE(channel_num, 1, 0, xx, xx, xx)
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SYSTEM_VALUE(alpha_ref_float, 1, 0, xx, xx, xx)
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/* Blend constant color values. Float values are clamped. */
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SYSTEM_VALUE(blend_const_color_r_float, 1, 0, xx, xx, xx)
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SYSTEM_VALUE(blend_const_color_g_float, 1, 0, xx, xx, xx)
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SYSTEM_VALUE(blend_const_color_b_float, 1, 0, xx, xx, xx)
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SYSTEM_VALUE(blend_const_color_a_float, 1, 0, xx, xx, xx)
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SYSTEM_VALUE(blend_const_color_rgba8888_unorm, 1, 0, xx, xx, xx)
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SYSTEM_VALUE(blend_const_color_aaaa8888_unorm, 1, 0, xx, xx, xx)
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/**
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* Barycentric coordinate intrinsics.
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