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Change shaded blend mode use srcalpha and destalpha.

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Fix blending error in add/sub/revsub
This commit is contained in:
Magnus Norddahl 2016-11-21 03:49:55 +01:00
commit 2ba2dc7611
6 changed files with 68 additions and 69 deletions
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23
src/r_compiler/fixedfunction/drawercodegen.cpp
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@ -107,18 +107,27 @@ SSAVec4i DrawerCodegen::blend_copy(SSAVec4i fg)
SSAVec4i DrawerCodegen::blend_add(SSAVec4i fg, SSAVec4i bg, SSAInt srcalpha, SSAInt destalpha)
{
SSAInt alpha = fg[3];
alpha = alpha + (alpha >> 7); // 255 -> 256
srcalpha = (alpha * srcalpha + 128) >> 8;
SSAVec4i color = (fg * srcalpha + bg * destalpha) / 256;
return color.insert(3, 255);
}
SSAVec4i DrawerCodegen::blend_sub(SSAVec4i fg, SSAVec4i bg, SSAInt srcalpha, SSAInt destalpha)
{
SSAInt alpha = fg[3];
alpha = alpha + (alpha >> 7); // 255 -> 256
srcalpha = (alpha * srcalpha + 128) >> 8;
SSAVec4i color = (bg * destalpha - fg * srcalpha) / 256;
return color.insert(3, 255);
}
SSAVec4i DrawerCodegen::blend_revsub(SSAVec4i fg, SSAVec4i bg, SSAInt srcalpha, SSAInt destalpha)
{
SSAInt alpha = fg[3];
alpha = alpha + (alpha >> 7); // 255 -> 256
srcalpha = (alpha * srcalpha + 128) >> 8;
SSAVec4i color = (fg * srcalpha - bg * destalpha) / 256;
return color.insert(3, 255);
}
@ -126,7 +135,7 @@ SSAVec4i DrawerCodegen::blend_revsub(SSAVec4i fg, SSAVec4i bg, SSAInt srcalpha,
SSAVec4i DrawerCodegen::blend_alpha_blend(SSAVec4i fg, SSAVec4i bg)
{
SSAInt alpha = fg[3];
alpha = alpha + (alpha >> 7); // // 255 -> 256
alpha = alpha + (alpha >> 7); // 255 -> 256
SSAInt inv_alpha = 256 - alpha;
SSAVec4i color = (fg * alpha + bg * inv_alpha) / 256;
return color.insert(3, 255);
@ -139,3 +148,15 @@ SSAInt DrawerCodegen::calc_blend_bgalpha(SSAVec4i fg, SSAInt destalpha)
SSAInt inv_alpha = 256 - alpha;
return (destalpha * alpha + 256 * inv_alpha + 128) >> 8;
}
SSAVec4i DrawerCodegen::blend_stencil(SSAVec4i stencilcolor, SSAInt fgalpha, SSAVec4i bg, SSAInt srcalpha, SSAInt destalpha)
{
fgalpha = fgalpha + (fgalpha >> 7); // 255 -> 256
SSAInt inv_fgalpha = 256 - fgalpha;
srcalpha = (fgalpha * srcalpha + 128) >> 8;
destalpha = (destalpha * fgalpha + 256 * inv_fgalpha + 128) >> 8;
SSAVec4i color = (stencilcolor * srcalpha + bg * destalpha) / 256;
return color.insert(3, 255);
}