diff options
Diffstat (limited to 'Ryujinx.Graphics.Shader/Translation/EmitterContext.cs')
| -rw-r--r-- | Ryujinx.Graphics.Shader/Translation/EmitterContext.cs | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/Ryujinx.Graphics.Shader/Translation/EmitterContext.cs b/Ryujinx.Graphics.Shader/Translation/EmitterContext.cs index ba3b551d..332b3e02 100644 --- a/Ryujinx.Graphics.Shader/Translation/EmitterContext.cs +++ b/Ryujinx.Graphics.Shader/Translation/EmitterContext.cs @@ -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(); |