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[GPU] Centroid interpolation usage comment

This commit is contained in:
Triang3l 2020-07-09 12:22:45 +03:00
parent 1547b9df41
commit 39490f3c3a
1 changed files with 6 additions and 0 deletions
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6
src/xenia/gpu/xenos.h
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@ -558,6 +558,12 @@ enum class SampleControl : uint32_t {
// - sample_control is SQ_CONTEXT_MISC::sc_sample_cntl.
// - interpolator_control_sampling_pattern is
// SQ_INTERPOLATOR_CNTL::sampling_pattern.
// Centroid interpolation can be tested in Red Dead Redemption. If the GPU host
// backend implements guest MSAA properly, using host MSAA, with everything
// interpolated at centers, the Diez Coronas start screen background may have
// a few distinctly bright pixels on the mesas/buttes, where extrapolation
// happens. Interpolating certain values (ones that aren't used for gradient
// calculation, not texture coordinates) at centroids fixes this issue.
inline uint32_t GetInterpolatorSamplingPattern(
MsaaSamples msaa_samples, SampleControl sample_control,
uint32_t interpolator_control_sampling_pattern) {