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GS-metal: Check each channel individually if it overflows and do corrections.

This commit is contained in:
lightningterror 2023-02-21 17:37:44 +01:00
parent bd64ad510b
commit 2eb11ded52
1 changed files with 7 additions and 6 deletions
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13
pcsx2/GS/Renderers/Metal/tfx.metal
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@ -825,8 +825,10 @@ struct PSMain
return selector == 0 ? zero : selector == 1 ? one : two;
}
void ps_blend(thread float4& Color, thread float& As)
void ps_blend(thread float4& Color, thread float4& As_rgba)
{
float As = As_rgba.a;
if (SW_BLEND)
{
// PABE
@ -873,15 +875,14 @@ struct PSMain
{
// Replace Af with As so we can do proper compensation for Alpha.
if (PS_BLEND_C == 2)
As = cb.alpha_fix;
As_rgba = float4(cb.alpha_fix);
// 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,
// we divide by 255 the color because we don't know Cd value,
// changed alpha should only be done for hw blend.
float min_color = min(min(Color.r, Color.g), Color.b);
float alpha_compensate = max(1.f, min_color / 255.f);
As -= alpha_compensate;
float3 alpha_compensate = max(float3(1.f), Color.rgb / float3(255.f));
As_rgba.rgb -= alpha_compensate;
}
else if (PS_CLR_HW == 2)
{
@ -977,7 +978,7 @@ struct PSMain
C.a = 128.0f;
}
float alpha_blend = SW_AD_TO_HW ? (trunc(current_color.a * 255.5f) / 128.f) : (C.a / 128.f);
float4 alpha_blend = SW_AD_TO_HW ? float4(trunc(current_color.a * 255.5f) / 128.f) : float4(C.a / 128.f);
if (PS_DFMT == FMT_16)
{