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Attempt to properly match Software texture blending

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without messing with the original ASTBlendPixel function
This commit is contained in:
Jaime Passos 2020-05-16 13:51:10 -03:00
parent 288d7166bc
commit c64e231b2b
3 changed files with 47 additions and 14 deletions
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16
src/hardware/hw_cache.c
View file

@ -135,7 +135,7 @@ static void HWR_DrawColumnInCache(const column_t *patchcol, UINT8 *block, GLMipm
{
case 2 : // uhhhhhhhh..........
if ((originPatch != NULL) && (originPatch->style != AST_COPY))
texel = ASTBlendPixel_8bpp(*(dest+1), texel, originPatch->style, originPatch->alpha);
texel = ASTBlendPaletteIndexes(*(dest+1), texel, originPatch->style, originPatch->alpha);
texelu16 = (UINT16)((alpha<<8) | texel);
memcpy(dest, &texelu16, sizeof(UINT16));
break;
@ -144,7 +144,7 @@ static void HWR_DrawColumnInCache(const column_t *patchcol, UINT8 *block, GLMipm
{
RGBA_t rgbatexel;
rgbatexel.rgba = *(UINT32 *)dest;
colortemp.rgba = ASTBlendPixel(rgbatexel, colortemp, originPatch->style, originPatch->alpha);
colortemp.rgba = ASTBlendTexturePixel(rgbatexel, colortemp, originPatch->style, originPatch->alpha);
}
memcpy(dest, &colortemp, sizeof(RGBA_t)-sizeof(UINT8));
break;
@ -154,14 +154,14 @@ static void HWR_DrawColumnInCache(const column_t *patchcol, UINT8 *block, GLMipm
{
RGBA_t rgbatexel;
rgbatexel.rgba = *(UINT32 *)dest;
colortemp.rgba = ASTBlendPixel(rgbatexel, colortemp, originPatch->style, originPatch->alpha);
colortemp.rgba = ASTBlendTexturePixel(rgbatexel, colortemp, originPatch->style, originPatch->alpha);
}
memcpy(dest, &colortemp, sizeof(RGBA_t));
break;
// default is 1
default:
if ((originPatch != NULL) && (originPatch->style != AST_COPY))
*dest = ASTBlendPixel_8bpp(*dest, texel, originPatch->style, originPatch->alpha);
*dest = ASTBlendPaletteIndexes(*dest, texel, originPatch->style, originPatch->alpha);
else
*dest = texel;
break;
@ -247,7 +247,7 @@ static void HWR_DrawFlippedColumnInCache(const column_t *patchcol, UINT8 *block,
{
case 2 : // uhhhhhhhh..........
if ((originPatch != NULL) && (originPatch->style != AST_COPY))
texel = ASTBlendPixel_8bpp(*(dest+1), texel, originPatch->style, originPatch->alpha);
texel = ASTBlendPaletteIndexes(*(dest+1), texel, originPatch->style, originPatch->alpha);
texelu16 = (UINT16)((alpha<<8) | texel);
memcpy(dest, &texelu16, sizeof(UINT16));
break;
@ -256,7 +256,7 @@ static void HWR_DrawFlippedColumnInCache(const column_t *patchcol, UINT8 *block,
{
RGBA_t rgbatexel;
rgbatexel.rgba = *(UINT32 *)dest;
colortemp.rgba = ASTBlendPixel(rgbatexel, colortemp, originPatch->style, originPatch->alpha);
colortemp.rgba = ASTBlendTexturePixel(rgbatexel, colortemp, originPatch->style, originPatch->alpha);
}
memcpy(dest, &colortemp, sizeof(RGBA_t)-sizeof(UINT8));
break;
@ -266,14 +266,14 @@ static void HWR_DrawFlippedColumnInCache(const column_t *patchcol, UINT8 *block,
{
RGBA_t rgbatexel;
rgbatexel.rgba = *(UINT32 *)dest;
colortemp.rgba = ASTBlendPixel(rgbatexel, colortemp, originPatch->style, originPatch->alpha);
colortemp.rgba = ASTBlendTexturePixel(rgbatexel, colortemp, originPatch->style, originPatch->alpha);
}
memcpy(dest, &colortemp, sizeof(RGBA_t));
break;
// default is 1
default:
if ((originPatch != NULL) && (originPatch->style != AST_COPY))
*dest = ASTBlendPixel_8bpp(*dest, texel, originPatch->style, originPatch->alpha);
*dest = ASTBlendPaletteIndexes(*dest, texel, originPatch->style, originPatch->alpha);
else
*dest = texel;
break;

40
src/r_data.c
View file

@ -227,6 +227,8 @@ static inline void R_DrawFlippedColumnInCache(column_t *patch, UINT8 *cache, tex
}
}
// Blends two pixels together, using the equation
// that matches the specified alpha style.
UINT32 ASTBlendPixel(RGBA_t background, RGBA_t foreground, int style, UINT8 alpha)
{
RGBA_t output;
@ -307,18 +309,46 @@ UINT32 ASTBlendPixel(RGBA_t background, RGBA_t foreground, int style, UINT8 alph
return 0;
}
UINT8 ASTBlendPixel_8bpp(UINT8 background, UINT8 foreground, int style, UINT8 alpha)
INT32 ASTTextureBlendingThreshold[2] = {255/11, (10*255/11)};
// Blends a pixel for a texture patch.
UINT32 ASTBlendTexturePixel(RGBA_t background, RGBA_t foreground, int style, UINT8 alpha)
{
// Alpha style set to translucent?
if (style == AST_TRANSLUCENT)
{
// Is the alpha small enough for translucency?
if (alpha <= (10*255/11))
if (alpha <= ASTTextureBlendingThreshold[1])
{
// Is the patch way too translucent? Don't blend then.
if (alpha < ASTTextureBlendingThreshold[0])
return background;
return foreground;
}
else // just copy the pixel
return foreground;
}
else
return ASTBlendPixel(background, foreground, style, alpha);
}
// Blends two palette indexes for a texture patch, then
// finds the nearest palette index from the blended output.
UINT8 ASTBlendPaletteIndexes(UINT8 background, UINT8 foreground, int style, UINT8 alpha)
{
// Alpha style set to translucent?
if (style == AST_TRANSLUCENT)
{
// Is the alpha small enough for translucency?
if (alpha <= ASTTextureBlendingThreshold[1])
{
UINT8 *mytransmap;
// Is the patch way too translucent? Don't blend then.
if (alpha < 255/11)
if (alpha < ASTTextureBlendingThreshold[0])
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)
@ -383,7 +413,7 @@ static inline void R_DrawBlendColumnInCache(column_t *patch, UINT8 *cache, texpa
{
for (; dest < cache + position + count; source++, dest++)
if (*source != 0xFF)
*dest = ASTBlendPixel_8bpp(*dest, *source, originPatch->style, originPatch->alpha);
*dest = ASTBlendPaletteIndexes(*dest, *source, originPatch->style, originPatch->alpha);
}
patch = (column_t *)((UINT8 *)patch + patch->length + 4);
@ -427,7 +457,7 @@ static inline void R_DrawBlendFlippedColumnInCache(column_t *patch, UINT8 *cache
{
for (; dest < cache + position + count; --source, dest++)
if (*source != 0xFF)
*dest = ASTBlendPixel_8bpp(*dest, *source, originPatch->style, originPatch->alpha);
*dest = ASTBlendPaletteIndexes(*dest, *source, originPatch->style, originPatch->alpha);
}
patch = (column_t *)((UINT8 *)patch + patch->length + 4);

5
src/r_data.h
View file

@ -26,7 +26,10 @@
enum patchalphastyle {AST_COPY, AST_TRANSLUCENT, AST_ADD, AST_SUBTRACT, AST_REVERSESUBTRACT, AST_MODULATE, AST_OVERLAY};
UINT32 ASTBlendPixel(RGBA_t background, RGBA_t foreground, int style, UINT8 alpha);
UINT8 ASTBlendPixel_8bpp(UINT8 background, UINT8 foreground, int style, UINT8 alpha);
UINT32 ASTBlendTexturePixel(RGBA_t background, RGBA_t foreground, int style, UINT8 alpha);
UINT8 ASTBlendPaletteIndexes(UINT8 background, UINT8 foreground, int style, UINT8 alpha);
extern INT32 ASTTextureBlendingThreshold[2];
UINT8 NearestColor(UINT8 r, UINT8 g, UINT8 b);