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Shader: Bias textureGather instructions on AMD/Intel (#4703)

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* Experimental (GLSL, forced)

* SPIR-V attempt

* Add capability

* Fix pCount == 1 on glsl

* Fix typo
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riperiperi 2023-04-22 22:02:39 +01:00 • committed by GitHub
parent e27f5522e2
commit 8d9d508dc7
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GPG key ID: 4AEE18F83AFDEB23
9 changed files with 84 additions and 9 deletions
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23
Ryujinx.Graphics.Shader/CodeGen/Glsl/Instructions/InstGenMemory.cs
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@ -677,7 +677,28 @@ namespace Ryujinx.Graphics.Shader.CodeGen.Glsl.Instructions
return vector;
}
Append(ApplyScaling(AssemblePVector(pCount)));
string ApplyBias(string vector)
{
int gatherBiasPrecision = context.Config.GpuAccessor.QueryHostGatherBiasPrecision();
if (isGather && gatherBiasPrecision != 0)
{
// GPU requires texture gather to be slightly offset to match NVIDIA behaviour when point is exactly between two texels.
// Offset by the gather precision divided by 2 to correct for rounding.
if (pCount == 1)
{
vector = $"{vector} + (1.0 / (float(textureSize({samplerName}, 0)) * float({1 << (gatherBiasPrecision + 1)})))";
}
else
{
vector = $"{vector} + (1.0 / (vec{pCount}(textureSize({samplerName}, 0).{"xyz".Substring(0, pCount)}) * float({1 << (gatherBiasPrecision + 1)})))";
}
}
return vector;
}
Append(ApplyBias(ApplyScaling(AssemblePVector(pCount))));
string AssembleDerivativesVector(int count)
{