Hi,
This consists of 2 patch series:
Gallium:
gallium: add per-sample interpolation control into rasterizer state
st/mesa: set force_persample_interp if ARB_sample_shading is used
st/mesa: automatically set per-sample interpolation if using SampleID/Pos
RadeonSI:
tgsi/scan: add interpolation info into tgsi_shader_info
radeonsi: move SPI_PS_INPUT_ENA/ADDR registers to a separate state
radeonsi: implement the simple case of force_persample_interp
radeonsi: do force_persample_interp in shaders for non-trivial cases
radeonsi: enable PIPE_CAP_FORCE_PERSAMPLE_INTERP
The idea is to stop emulating GL_SAMPLE_SHADING using shader variants in
st/mesa and allow drivers to handle it however they want.
The RadeonSI implementation has 2 codepaths:
- Adjust the PS input state bits for trivial cases without touching the shader
code.
- If that's not possible, use a conditional assignment that selects the
interpolation weights based on a constant in the pixel shader.
Please review.
Ideas for r600g:
- Evergreen/Cayman would need to do it like radeonsi if somebody cares.
- R600-R700 only have a state for forcing per-sample interpolation, so that's
easy.
Marek
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