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

This commit is contained in:
lightningterror 2023-02-21 17:37:33 +01:00
parent 4e9b7e61a7
commit bd64ad510b
1 changed files with 10 additions and 9 deletions
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19
bin/resources/shaders/vulkan/tfx.glsl
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@ -1002,8 +1002,10 @@ void ps_color_clamp_wrap(inout vec3 C)
#endif
}
void ps_blend(inout vec4 Color, inout float As)
void ps_blend(inout vec4 Color, inout vec4 As_rgba)
{
float As = As_rgba.a;
#if SW_BLEND
// PABE
@ -1087,16 +1089,15 @@ void ps_blend(inout vec4 Color, inout float As)
#if PS_CLR_HW == 1
// Replace Af with As so we can do proper compensation for Alpha.
#if PS_BLEND_C == 2
As = Af;
As_rgba = vec4(Af);
#endif
// 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(1.0f, min_color / 255.0f);
As -= alpha_compensate;
vec3 alpha_compensate = max(vec3(1.0f), Color.rgb / vec3(255.0f));
As_rgba.rgb -= alpha_compensate;
#elif PS_CLR_HW == 2
// Compensate slightly for Cd*(As + 1) - Cs*As.
// The initial factor we chose is 1 (0.00392)
@ -1213,9 +1214,9 @@ void main()
#if (PS_BLEND_C == 1 && PS_CLR_HW > 3)
vec4 RT = trunc(subpassLoad(RtSampler) * 255.0f + 0.1f);
float alpha_blend = RT.a / 128.0f;
vec4 alpha_blend = vec4(RT.a / 128.0f);
#else
float alpha_blend = C.a / 128.0f;
vec4 alpha_blend = vec4(C.a / 128.0f);
#endif
// Correct the ALPHA value based on the output format
@ -1257,12 +1258,12 @@ void main()
o_col0 = C / 255.0f;
#endif
#if !defined(DISABLE_DUAL_SOURCE) && !PS_NO_COLOR1
o_col1 = vec4(alpha_blend);
o_col1 = alpha_blend;
#endif
#if PS_NO_ABLEND
// write alpha blend factor into col0
o_col0.a = alpha_blend;
o_col0.a = alpha_blend.a;
#endif
#if PS_ONLY_ALPHA
// rgb isn't used