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opengl patch translucency

This commit is contained in:
Jaime Passos 2019-09-07 22:43:29 -03:00
parent c6af108d8c
commit 4adff34402
1 changed files with 83 additions and 4 deletions
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87
src/hardware/hw_cache.c
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@ -60,6 +60,47 @@ static const INT32 format2bpp[16] =
2, //14 GR_TEXFMT_AP_88
};
static RGBA_t astblendpixel(RGBA_t background, RGBA_t foreground, int style, UINT8 alpha)
{
RGBA_t output;
output.s.alpha = 0xFF;
if (style == AST_TRANSLUCENT)
{
if (alpha == 0)
output.rgba = background.rgba;
else if (alpha == 0xFF)
output.rgba = foreground.rgba;
else if (alpha < 0xFF)
{
UINT8 beta = (0xFF - alpha);
output.s.red = ((background.s.red * beta) + (foreground.s.red * alpha)) / 0xFF;
output.s.green = ((background.s.green * beta) + (foreground.s.green * alpha)) / 0xFF;
output.s.blue = ((background.s.blue * beta) + (foreground.s.blue * alpha)) / 0xFF;
}
// write foreground pixel alpha
// if there's no pixel in here
if (!background.rgba)
output.s.alpha = foreground.s.alpha;
}
return output;
}
static UINT8 astblendpixel_8bpp(UINT8 background, UINT8 foreground, int style, UINT8 alpha)
{
if ((style == AST_TRANSLUCENT) && (alpha <= (10*255/11))) // Alpha style set to translucent? Is the alpha small enough for translucency?
{
UINT8 *mytransmap;
if (alpha < 255/11) // Is the patch way too translucent? Don't render then.
return background;
// The equation's not exact but it works as intended. I'll call it a day for now.
mytransmap = transtables + ((8*(alpha) + 255/8)/(255 - 255/11) << FF_TRANSSHIFT);
if (background != 0xFF)
return *(mytransmap + (background<<8) + foreground);
}
return background;
}
// This code was originally placed directly in HWR_DrawPatchInCache.
// It is now split from it for my sanity! (and the sanity of others)
@ -138,18 +179,37 @@ static void HWR_DrawColumnInCache(const column_t *patchcol, UINT8 *block, GLMipm
// Alam: SRB2 uses Mingw, HUGS
switch (bpp)
{
case 2 : texelu16 = (UINT16)((alpha<<8) | texel);
case 2 : // uhhhhhhhh..........
if ((originPatch != NULL) && originPatch->style)
texel = astblendpixel_8bpp(*(dest+1), texel, originPatch->style, originPatch->alpha);
texelu16 = (UINT16)((alpha<<8) | texel);
memcpy(dest, &texelu16, sizeof(UINT16));
break;
case 3 : colortemp = V_GetColor(texel);
if ((originPatch != NULL) && originPatch->style)
{
RGBA_t rgbatexel;
rgbatexel.rgba = *(UINT32 *)dest;
colortemp = astblendpixel(rgbatexel, colortemp, originPatch->style, originPatch->alpha);
}
memcpy(dest, &colortemp, sizeof(RGBA_t)-sizeof(UINT8));
break;
case 4 : colortemp = V_GetColor(texel);
colortemp.s.alpha = alpha;
if ((originPatch != NULL) && originPatch->style)
{
RGBA_t rgbatexel;
rgbatexel.rgba = *(UINT32 *)dest;
colortemp = astblendpixel(rgbatexel, colortemp, originPatch->style, originPatch->alpha);
}
memcpy(dest, &colortemp, sizeof(RGBA_t));
break;
// default is 1
default: *dest = texel;
default:
if ((originPatch != NULL) && originPatch->style)
*dest = astblendpixel_8bpp(*dest, texel, originPatch->style, originPatch->alpha);
else
*dest = texel;
break;
}
@ -233,18 +293,37 @@ static void HWR_DrawFlippedColumnInCache(const column_t *patchcol, UINT8 *block,
// Alam: SRB2 uses Mingw, HUGS
switch (bpp)
{
case 2 : texelu16 = (UINT16)((alpha<<8) | texel);
case 2 : // uhhhhhhhh..........
if ((originPatch != NULL) && originPatch->style)
texel = astblendpixel_8bpp(*(dest+1), texel, originPatch->style, originPatch->alpha);
texelu16 = (UINT16)((alpha<<8) | texel);
memcpy(dest, &texelu16, sizeof(UINT16));
break;
case 3 : colortemp = V_GetColor(texel);
if ((originPatch != NULL) && originPatch->style)
{
RGBA_t rgbatexel;
rgbatexel.rgba = *(UINT32 *)dest;
colortemp = astblendpixel(rgbatexel, colortemp, originPatch->style, originPatch->alpha);
}
memcpy(dest, &colortemp, sizeof(RGBA_t)-sizeof(UINT8));
break;
case 4 : colortemp = V_GetColor(texel);
colortemp.s.alpha = alpha;
if ((originPatch != NULL) && originPatch->style)
{
RGBA_t rgbatexel;
rgbatexel.rgba = *(UINT32 *)dest;
colortemp = astblendpixel(rgbatexel, colortemp, originPatch->style, originPatch->alpha);
}
memcpy(dest, &colortemp, sizeof(RGBA_t));
break;
// default is 1
default: *dest = texel;
default:
if ((originPatch != NULL) && originPatch->style)
*dest = astblendpixel_8bpp(*dest, texel, originPatch->style, originPatch->alpha);
else
*dest = texel;
break;
}