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VideoCommon: Use coarse derivatives for Manual Texture Sampling if possible

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This commit is contained in:
Pokechu22
2021-11-13 20:10:20 -08:00
parent ddf2691395
commit 51e3334526
10 changed files with 37 additions and 4 deletions
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26
Source/Core/VideoCommon/PixelShaderGen.cpp
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@ -628,15 +628,35 @@ uint WrapCoord(int coord, uint wrap, int size) {{
BitfieldExtract<&SamplerState::TM1::max_lod>("texmode1"));
if (api_type == APIType::OpenGL || api_type == APIType::Vulkan)
out.Write(R"(
{
if (g_ActiveConfig.backend_info.bSupportsCoarseDerivatives)
{
// The software renderer uses the equivalent of coarse derivatives, so use them here for
// consistency. This hasn't been hardware tested.
// Note that bSupportsCoarseDerivatives being false only means dFdxCoarse and dFdxFine don't
// exist. The GPU may still implement dFdx using coarse derivatives; we just don't have the
// ability to specifically require it.
out.Write(R"(
float2 uv_delta_x = abs(dFdxCoarse(float2(uv)));
float2 uv_delta_y = abs(dFdyCoarse(float2(uv)));
)");
}
else
{
out.Write(R"(
float2 uv_delta_x = abs(dFdx(float2(uv)));
float2 uv_delta_y = abs(dFdy(float2(uv)));
)");
}
}
else if (api_type == APIType::D3D)
{
ASSERT(g_ActiveConfig.backend_info.bSupportsCoarseDerivatives);
out.Write(R"(
float2 uv_delta_x = abs(ddx(float2(uv)));
float2 uv_delta_y = abs(ddy(float2(uv)));
float2 uv_delta_x = abs(ddx_coarse(float2(uv)));
float2 uv_delta_y = abs(ddy_coarse(float2(uv)));
)");
}
// TODO: LOD bias is normally S2.5 (Dolphin uses S7.8 for arbitrary mipmap detection and higher
// IRs), but (at least per the software renderer) actual LOD is S28.4. How does this work?