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softgpu: Match texenv blend texfunc accurately.

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Unknown W. Brackets 2021-12-05 16:09:26 -08:00
parent 0b6e7c421f
commit 325a1f75aa
1 changed files with 19 additions and 2 deletions
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21
GPU/Software/Rasterizer.cpp
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@ -312,8 +312,10 @@ Vec4IntResult SOFTRAST_CALL GetTextureFunctionOutput(Vec4IntArg prim_color_in, V
if (rgba) {
int t = (rgba) ? texcolor.a() : 255;
int invt = (rgba) ? 255 - t : 0;
// Both colors are boosted here, making the alpha have more weight.
Vec3<int> one = Vec3<int>::AssignToAll(1);
out_rgb = ((prim_color.rgb() + one) * invt + (texcolor.rgb() + one) * t);
// Keep the bits of accuracy when doubling.
if (gstate.isColorDoublingEnabled())
out_rgb /= 128;
else
@ -329,13 +331,28 @@ Vec4IntResult SOFTRAST_CALL GetTextureFunctionOutput(Vec4IntArg prim_color_in, V
{
const Vec3<int> const255(255, 255, 255);
const Vec3<int> texenv(gstate.getTextureEnvColR(), gstate.getTextureEnvColG(), gstate.getTextureEnvColB());
out_rgb = ((const255 - texcolor.rgb()) * prim_color.rgb() + texcolor.rgb() * texenv) / 255;
out_a = prim_color.a() * ((rgba) ? texcolor.a() : 255) / 255;
// Unlike the others (and even alpha), this one simply always rounds up.
const Vec3<int> roundup = Vec3<int>::AssignToAll(255);
out_rgb = ((const255 - texcolor.rgb()) * prim_color.rgb() + texcolor.rgb() * texenv + roundup);
// Must divide by less to keep the precision for doubling to be accurate.
if (gstate.isColorDoublingEnabled())
out_rgb /= 128;
else
out_rgb /= 256;
if (rgba)
out_a = ((prim_color.a() + 1) * texcolor.a()) / 256;
else
out_a = prim_color.a();
break;
}
case GE_TEXFUNC_REPLACE:
out_rgb = texcolor.rgb();
// Doubling even happens for replace.
if (gstate.isColorDoublingEnabled())
out_rgb *= 2;
out_a = (rgba) ? texcolor.a() : prim_color.a();
break;