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add comment about "Carmack's typo"

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Roman Fomin 2024-03-17 11:20:55 +07:00
parent f001b48f8f
commit 3c572f8395
1 changed files with 2 additions and 0 deletions
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src/v_video.c
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@ -208,6 +208,8 @@ void V_InitColorTranslation(void)
double green = *palsrc++ / 256.0;
double blue = *palsrc++ / 256.0;
// formula is taken from dcolors.c preseving "Carmack's typo"
// https://doomwiki.org/wiki/Carmack%27s_typo
int gray = (red * 0.299 + green * 0.587 + blue * 0.144) * 255;
invul_gray[i] = I_GetPaletteIndex(playpal, gray, gray, gray);
}