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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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30
Ryujinx.Graphics.Shader/CodeGen/Spirv/Instructions.cs
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@ -4,6 +4,7 @@ using Ryujinx.Graphics.Shader.Translation;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Numerics;
using static Spv.Specification;
@ -1556,6 +1557,33 @@ namespace Ryujinx.Graphics.Shader.CodeGen.Spirv
}
}
SpvInstruction ApplyBias(SpvInstruction vector, SpvInstruction image)
{
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.
var sizeType = pCount == 1 ? context.TypeS32() : context.TypeVector(context.TypeS32(), pCount);
var pVectorType = pCount == 1 ? context.TypeFP32() : context.TypeVector(context.TypeFP32(), pCount);
var bias = context.Constant(context.TypeFP32(), (float)(1 << (gatherBiasPrecision + 1)));
var biasVector = context.CompositeConstruct(pVectorType, Enumerable.Repeat(bias, pCount).ToArray());
var one = context.Constant(context.TypeFP32(), 1f);
var oneVector = context.CompositeConstruct(pVectorType, Enumerable.Repeat(one, pCount).ToArray());
var divisor = context.FMul(
pVectorType,
context.ConvertSToF(pVectorType, context.ImageQuerySize(sizeType, image)),
biasVector);
vector = context.FAdd(pVectorType, vector, context.FDiv(pVectorType, oneVector, divisor));
}
return vector;
}
SpvInstruction pCoords = AssemblePVector(pCount);
pCoords = ScalingHelpers.ApplyScaling(context, texOp, pCoords, intCoords, isBindless, isIndexed, isArray, pCount);
@ -1716,6 +1744,8 @@ namespace Ryujinx.Graphics.Shader.CodeGen.Spirv
image = context.Image(imageType, image);
}
pCoords = ApplyBias(pCoords, image);
var operands = operandsList.ToArray();
SpvInstruction result;