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Add a new blend mode for sprites

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This commit is contained in:
Magnus Norddahl 2016-11-30 07:49:04 +01:00
commit 03282c957b
7 changed files with 34 additions and 2 deletions
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7
tools/drawergen/fixedfunction/drawercodegen.cpp
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@ -160,3 +160,10 @@ SSAVec4i DrawerCodegen::blend_stencil(SSAVec4i stencilcolor, SSAInt fgalpha, SSA
SSAVec4i color = (stencilcolor * srcalpha + bg * destalpha) / 256;
return color.insert(3, 255);
}
SSAVec4i DrawerCodegen::blend_add_srccolor_oneminussrccolor(SSAVec4i fg, SSAVec4i bg)
{
SSAVec4i fgcolor = fg + (fg >> 7); // 255 -> 256
SSAVec4i inv_fgcolor = SSAVec4i(256) - fgcolor;
return fg + (bg * inv_fgcolor + 128) >> 8;
}