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rsx: Implement packed format renormalization

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- Renormalizes arbitrary N-bit values as 8-bit normalized.
- NV hardware performs integer normalization at 8 bits if the size is less than 8.
- This can cause significant arithmetic drift because the error is multiplied by a huge number when sampling.
This commit is contained in:
kd-11 2019-10-13 22:37:10 +03:00 • committed by kd-11
parent 407be45069
commit f7842b765f
5 changed files with 50 additions and 10 deletions
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18
rpcs3/Emu/RSX/RSXThread.cpp
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@ -710,7 +710,7 @@ namespace rsx
auto alpha_ref = rsx::method_registers.alpha_ref() / 255.f;
auto rop_control = rsx::method_registers.alpha_test_enabled()? 1u : 0u;
if (rsx::method_registers.msaa_alpha_to_coverage_enabled() && !supports_hw_a2c)
if (rsx::method_registers.msaa_alpha_to_coverage_enabled() && !backend_config.supports_hw_a2c)
{
// Alpha values generate a coverage mask for order independent blending
// Requires hardware AA to work properly (or just fragment sample stage in fragment shaders)
@ -1739,6 +1739,22 @@ namespace rsx
LOG_ERROR(RSX, "Depth texture bound to pipeline with unexpected format 0x%X", format);
}
}
else if (!backend_config.supports_hw_renormalization)
{
switch (format)
{
case CELL_GCM_TEXTURE_A1R5G5B5:
case CELL_GCM_TEXTURE_A4R4G4B4:
case CELL_GCM_TEXTURE_D1R5G5B5:
case CELL_GCM_TEXTURE_R5G5B5A1:
case CELL_GCM_TEXTURE_R5G6B5:
case CELL_GCM_TEXTURE_R6G5B5:
texture_control |= (1 << 5);
break;
default:
break;
}
}
if (const auto srgb_mask = tex.gamma())
{