OrdinaryMagician/vkdoom_m
OrdinaryMagician/vkdoom_m
1
Fork 0
Code Activity

- reversed sub and revsub in LLVM drawers

Browse source
This commit is contained in:
Rachael Alexanderson 2016-12-22 03:21:56 -05:00
commit ea1aeb3cdc
2 changed files with 3 additions and 3 deletions
Download patch file Download diff file Expand all files Collapse all files

4
tools/drawergen/fixedfunction/drawercodegen.cpp
View file

@ -119,7 +119,7 @@ SSAVec4i DrawerCodegen::blend_sub(SSAVec4i fg, SSAVec4i bg, SSAInt srcalpha, SSA
SSAInt alpha = fg[3];
alpha = alpha + (alpha >> 7); // 255 -> 256
srcalpha = (alpha * srcalpha + 128) >> 8;
SSAVec4i color = (bg * destalpha - fg * srcalpha) / 256;
SSAVec4i color = (fg * srcalpha - bg * destalpha) / 256;
return color.insert(3, 255);
}
@ -128,7 +128,7 @@ SSAVec4i DrawerCodegen::blend_revsub(SSAVec4i fg, SSAVec4i bg, SSAInt srcalpha,
SSAInt alpha = fg[3];
alpha = alpha + (alpha >> 7); // 255 -> 256
srcalpha = (alpha * srcalpha + 128) >> 8;
SSAVec4i color = (fg * srcalpha - bg * destalpha) / 256;
SSAVec4i color = (bg * destalpha - fg * srcalpha) / 256;
return color.insert(3, 255);
}