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Add support for alpha to coverage dithering (#3069)

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* Add support for alpha to coverage dithering

* Shader cache version bump

* Fix wrong alpha register

* Ensure support buffer is cleared

* New shader specialization based approach
This commit is contained in:
gdkchan 2022-07-05 19:58:36 -03:00 • committed by GitHub
parent 594246ea47
commit b46b63e06a
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GPG key ID: 4AEE18F83AFDEB23
20 changed files with 217 additions and 34 deletions
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31
Ryujinx.Graphics.Shader/Translation/EmitterContext.cs
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@ -205,6 +205,8 @@ namespace Ryujinx.Graphics.Shader.Translation
}
else if (Config.Stage == ShaderStage.Fragment)
{
GenerateAlphaToCoverageDitherDiscard();
if (Config.OmapDepth)
{
Operand dest = Attribute(AttributeConsts.FragmentOutputDepth);
@ -266,6 +268,35 @@ namespace Ryujinx.Graphics.Shader.Translation
}
}
private void GenerateAlphaToCoverageDitherDiscard()
{
// If the feature is disabled, or alpha is not written, then we're done.
if (!Config.GpuAccessor.QueryAlphaToCoverageDitherEnable() || (Config.OmapTargets & 8) == 0)
{
return;
}
// 11 11 11 10 10 10 10 00
// 11 01 01 01 01 00 00 00
Operand ditherMask = Const(unchecked((int)0xfbb99110u));
Operand x = this.BitwiseAnd(this.FP32ConvertToU32(Attribute(AttributeConsts.PositionX)), Const(1));
Operand y = this.BitwiseAnd(this.FP32ConvertToU32(Attribute(AttributeConsts.PositionY)), Const(1));
Operand xy = this.BitwiseOr(x, this.ShiftLeft(y, Const(1)));
Operand alpha = Register(3, RegisterType.Gpr);
Operand scaledAlpha = this.FPMultiply(this.FPSaturate(alpha), ConstF(8));
Operand quantizedAlpha = this.IMinimumU32(this.FP32ConvertToU32(scaledAlpha), Const(7));
Operand shift = this.BitwiseOr(this.ShiftLeft(quantizedAlpha, Const(2)), xy);
Operand opaque = this.BitwiseAnd(this.ShiftRightU32(ditherMask, shift), Const(1));
Operand a2cDitherEndLabel = Label();
this.BranchIfTrue(a2cDitherEndLabel, opaque);
this.Discard();
this.MarkLabel(a2cDitherEndLabel);
}
public Operation[] GetOperations()
{
return _operations.ToArray();