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R_AddColormaps method

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This commit is contained in:
mazmazz 2018-09-11 21:02:58 -04:00
parent a1a05c9972
commit 0fb594ad58
2 changed files with 91 additions and 0 deletions
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86
src/r_data.c
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@ -1876,6 +1876,92 @@ extracolormap_t *R_CreateColormap(char *p1, char *p2, char *p3)
return extra_colormap;
}
//
// R_AddColormaps()
// NOTE: The result colormap DOES get added to the extra_colormaps chain!
//
extracolormap_t *R_AddColormaps(extracolormap_t *exc_augend, extracolormap_t *exc_addend,
boolean subR, boolean subG, boolean subB, boolean subA,
boolean subFadeR, boolean subFadeG, boolean subFadeB, boolean subFadeA,
boolean useAltAlpha, INT16 altAlpha, INT16 altFadeAlpha,
boolean lighttable)
{
extracolormap_t *exc;
// exc_augend is added (or subtracted) onto by exc_addend
// In Rennaisance times, the first number was considered the augend, the second number the addend
// But since the commutative property was discovered, today they're both called addends!
// So let's be Olde English for a hot second.
exc_augend = R_CopyColormap(exc_augend, false);
if(!exc_addend)
exc_addend = R_GetDefaultColormap();
INT16 red, green, blue, alpha;
// base rgba
red = max(min(
R_GetRgbaR(exc_augend->rgba)
+ (subR ? -1 : 1) // subtract R
* R_GetRgbaR(exc_addend->rgba)
, 255), 0);
green = max(min(
R_GetRgbaG(exc_augend->rgba)
+ (subG ? -1 : 1) // subtract G
* R_GetRgbaG(exc_addend->rgba)
, 255), 0);
blue = max(min(
R_GetRgbaB(exc_augend->rgba)
+ (subB ? -1 : 1) // subtract B
* R_GetRgbaB(exc_addend->rgba)
, 255), 0);
alpha = useAltAlpha ? altAlpha : R_GetRgbaA(exc_addend->rgba);
alpha = max(min(R_GetRgbaA(exc_augend->rgba) + (subA ? -1 : 1) * alpha, 25), 0);
exc_augend->rgba = R_PutRgbaRGBA(red, green, blue, alpha);
// fade rgba
red = max(min(
R_GetRgbaR(exc_augend->fadergba)
+ (subFadeR ? -1 : 1) // subtract R
* R_GetRgbaR(exc_addend->fadergba)
, 255), 0);
green = max(min(
R_GetRgbaG(exc_augend->fadergba)
+ (subFadeG ? -1 : 1) // subtract G
* R_GetRgbaG(exc_addend->fadergba)
, 255), 0);
blue = max(min(
R_GetRgbaB(exc_augend->fadergba)
+ (subFadeB ? -1 : 1) // subtract B
* R_GetRgbaB(exc_addend->fadergba)
, 255), 0);
alpha = useAltAlpha ? altFadeAlpha : R_GetRgbaA(exc_addend->fadergba);
if (alpha == 25)
alpha = 0; // HACK: fadergba A defaults at 25, so don't add anything in this case
alpha = max(min(R_GetRgbaA(exc_augend->fadergba) + (subFadeA ? -1 : 1) * alpha, 25), 0);
exc_augend->fadergba = R_PutRgbaRGBA(red, green, blue, alpha);
if (!(exc = R_GetColormapFromList(exc_augend)))
{
exc_augend->colormap = lighttable ? R_CreateLightTable(exc_augend) : NULL;
R_AddColormapToList(exc_augend);
return exc_augend;
}
else
{
Z_Free(exc_augend);
return exc;
}
}
// Thanks to quake2 source!
// utils3/qdata/images.c
static UINT8 NearestColor(UINT8 r, UINT8 g, UINT8 b)

5
src/r_data.h
View file

@ -124,6 +124,11 @@ extracolormap_t *R_GetColormapFromList(extracolormap_t *extra_colormap);
lighttable_t *R_CreateLightTable(extracolormap_t *extra_colormap);
extracolormap_t *R_CreateColormap(char *p1, char *p2, char *p3);
extracolormap_t *R_AddColormaps(extracolormap_t *exc_augend, extracolormap_t *exc_addend,
boolean subR, boolean subG, boolean subB, boolean subA,
boolean subFadeR, boolean subFadeG, boolean subFadeB, boolean subFadeA,
boolean useAltAlpha, INT16 altAlpha, INT16 altFadeAlpha,
boolean lighttable);
#ifdef EXTRACOLORMAPLUMPS
extracolormap_t *R_ColormapForName(char *name);
const char *R_NameForColormap(extracolormap_t *extra_colormap);