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Force reciprocal operation with value biased by constant to be precise on macOS (#5110)

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* Force operations to be precise in some cases on SPIR-V

* Make it a bit more strict, add comments

* Shader cache version bump
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gdkchan 2023-05-26 15:19:37 -03:00 • committed by GitHub
parent e6658c133c
commit 3b375525fb
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8 changed files with 67 additions and 14 deletions
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25
src/Ryujinx.Graphics.Shader/Translation/Rewriter.cs
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@ -14,6 +14,7 @@ namespace Ryujinx.Graphics.Shader.Translation
public static void RunPass(HelperFunctionManager hfm, BasicBlock[] blocks, ShaderConfig config)
{
bool isVertexShader = config.Stage == ShaderStage.Vertex;
bool isImpreciseFragmentShader = config.Stage == ShaderStage.Fragment && config.GpuAccessor.QueryHostReducedPrecision();
bool hasConstantBufferDrawParameters = config.GpuAccessor.QueryHasConstantBufferDrawParameters();
bool hasVectorIndexingBug = config.GpuAccessor.QueryHostHasVectorIndexingBug();
bool supportsSnormBufferTextureFormat = config.GpuAccessor.QueryHostSupportsSnormBufferTextureFormat();
@ -45,6 +46,11 @@ namespace Ryujinx.Graphics.Shader.Translation
}
}
if (isImpreciseFragmentShader)
{
EnableForcePreciseIfNeeded(operation);
}
if (hasVectorIndexingBug)
{
InsertVectorComponentSelect(node, config);
@ -81,6 +87,25 @@ namespace Ryujinx.Graphics.Shader.Translation
}
}
private static void EnableForcePreciseIfNeeded(Operation operation)
{
// There are some cases where a small bias is added to values to prevent division by zero.
// When operating with reduced precision, it is possible for this bias to get rounded to 0
// and cause a division by zero.
// To prevent that, we force those operations to be precise even if the host wants
// imprecise operations for performance.
if (operation.Inst == (Instruction.FP32 | Instruction.Divide) &&
operation.GetSource(0).Type == OperandType.Constant &&
operation.GetSource(0).AsFloat() == 1f &&
operation.GetSource(1).AsgOp is Operation addOp &&
addOp.Inst == (Instruction.FP32 | Instruction.Add) &&
addOp.GetSource(1).Type == OperandType.Constant)
{
addOp.ForcePrecise = true;
}
}
private static void InsertVectorComponentSelect(LinkedListNode<INode> node, ShaderConfig config)
{
Operation operation = (Operation)node.Value;