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GS-metal: Add clr3 case for blend mix 2. 

When Cs*(Alpha + 1) overflows compensate with adjusting Alpha output for Cd*Alpha.
This commit is contained in:
lightningterror 2023-02-26 21:59:39 +01:00
parent a3ecf0b0bd
commit af9353298c
1 changed files with 12 additions and 3 deletions
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15
pcsx2/GS/Renderers/Metal/tfx.metal
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@ -881,9 +881,8 @@ struct PSMain
if (PS_CLR_HW == 1)
{
// Replace Af with As so we can do proper compensation for Alpha.
if (PS_BLEND_C == 2)
As_rgba = float4(cb.alpha_fix);
// As or Af
As_rgba.rgb = float3(C);
// Subtract 1 for alpha to compensate for the changed equation,
// if c.rgb > 255.0f then we further need to adjust alpha accordingly,
// we pick the lowest overflow from all colors because it's the safest,
@ -902,6 +901,16 @@ struct PSMain
float color_compensate = 1.f * (C + 1.f);
Color.rgb -= float3(color_compensate);
}
else if (PS_CLR_HW == 3)
{
// As, Ad or Af clamped.
As_rgba.rgb = float3(C_clamped);
// Cs*(Alpha + 1) might overflow, if it does then adjust alpha value
// that is sent on second output to compensate.
float3 overflow_check = (Color.rgb - float3(255.f)) / 255.f;
float3 alpha_compensate = max(float3(0.f), overflow_check);
As_rgba.rgb -= alpha_compensate;
}
}
else
{