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Implement all the other alpha blend styles

This commit is contained in:
Jaime Passos 2019-09-08 13:21:00 -03:00
parent 4adff34402
commit ff1fa3f92b
3 changed files with 138 additions and 87 deletions
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85
src/hardware/hw_cache.c
View File

@ -60,48 +60,6 @@ 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)
// -- Monster Iestyn (13/02/19)
@ -180,34 +138,34 @@ static void HWR_DrawColumnInCache(const column_t *patchcol, UINT8 *block, GLMipm
switch (bpp)
{
case 2 : // uhhhhhhhh..........
if ((originPatch != NULL) && originPatch->style)
texel = astblendpixel_8bpp(*(dest+1), texel, originPatch->style, originPatch->alpha);
if ((originPatch != NULL) && (originPatch->style != AST_COPY))
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)
if ((originPatch != NULL) && (originPatch->style != AST_COPY))
{
RGBA_t rgbatexel;
rgbatexel.rgba = *(UINT32 *)dest;
colortemp = astblendpixel(rgbatexel, colortemp, originPatch->style, originPatch->alpha);
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)
if ((originPatch != NULL) && (originPatch->style != AST_COPY))
{
RGBA_t rgbatexel;
rgbatexel.rgba = *(UINT32 *)dest;
colortemp = astblendpixel(rgbatexel, colortemp, originPatch->style, originPatch->alpha);
colortemp = ASTBlendPixel(rgbatexel, colortemp, originPatch->style, originPatch->alpha);
}
memcpy(dest, &colortemp, sizeof(RGBA_t));
break;
// default is 1
default:
if ((originPatch != NULL) && originPatch->style)
*dest = astblendpixel_8bpp(*dest, texel, originPatch->style, originPatch->alpha);
if ((originPatch != NULL) && (originPatch->style != AST_COPY))
*dest = ASTBlendPixel_8bpp(*dest, texel, originPatch->style, originPatch->alpha);
else
*dest = texel;
break;
@ -294,34 +252,34 @@ static void HWR_DrawFlippedColumnInCache(const column_t *patchcol, UINT8 *block,
switch (bpp)
{
case 2 : // uhhhhhhhh..........
if ((originPatch != NULL) && originPatch->style)
texel = astblendpixel_8bpp(*(dest+1), texel, originPatch->style, originPatch->alpha);
if ((originPatch != NULL) && (originPatch->style != AST_COPY))
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)
if ((originPatch != NULL) && (originPatch->style != AST_COPY))
{
RGBA_t rgbatexel;
rgbatexel.rgba = *(UINT32 *)dest;
colortemp = astblendpixel(rgbatexel, colortemp, originPatch->style, originPatch->alpha);
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)
if ((originPatch != NULL) && (originPatch->style != AST_COPY))
{
RGBA_t rgbatexel;
rgbatexel.rgba = *(UINT32 *)dest;
colortemp = astblendpixel(rgbatexel, colortemp, originPatch->style, originPatch->alpha);
colortemp = ASTBlendPixel(rgbatexel, colortemp, originPatch->style, originPatch->alpha);
}
memcpy(dest, &colortemp, sizeof(RGBA_t));
break;
// default is 1
default:
if ((originPatch != NULL) && originPatch->style)
*dest = astblendpixel_8bpp(*dest, texel, originPatch->style, originPatch->alpha);
if ((originPatch != NULL) && (originPatch->style != AST_COPY))
*dest = ASTBlendPixel_8bpp(*dest, texel, originPatch->style, originPatch->alpha);
else
*dest = texel;
break;
@ -410,16 +368,7 @@ static void HWR_DrawTexturePatchInCache(GLMipmap_t *mipmap,
if (texture->width <= 0 || texture->height <= 0)
return;
/*if ((patch->style == AST_TRANSLUCENT) && (patch->alpha <= (10*255/11))) // Alpha style set to translucent? Is the alpha small enough for translucency?
{
if (patch->alpha < 255/11) // Is the patch way too translucent? Don't render then.
continue;
ColumnDrawerPointer = (patch->flip & 2) ? HWR_DrawTransFlippedColumnInCache : HWR_DrawTransColumnInCache;
}
else*/
{
ColumnDrawerPointer = (patch->flip & 2) ? HWR_DrawFlippedColumnInCache : HWR_DrawColumnInCache;
}
ColumnDrawerPointer = (patch->flip & 2) ? HWR_DrawFlippedColumnInCache : HWR_DrawColumnInCache;
x1 = patch->originx;
width = SHORT(realpatch->width);

133
src/r_data.c
View File

@ -220,15 +220,110 @@ static inline void R_DrawFlippedColumnInCache(column_t *patch, UINT8 *cache, tex
}
}
RGBA_t ASTBlendPixel(RGBA_t background, RGBA_t foreground, int style, UINT8 alpha)
{
RGBA_t output;
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;
}
#define clamp(c) max(min(c, 0xFF), 0x00);
else
{
float falpha = ((float)alpha / 256.0f);
float fr = ((float)foreground.s.red * falpha);
float fg = ((float)foreground.s.green * falpha);
float fb = ((float)foreground.s.blue * falpha);
if (style == AST_ADD)
{
output.s.red = clamp((int)(background.s.red + fr));
output.s.green = clamp((int)(background.s.green + fg));
output.s.blue = clamp((int)(background.s.blue + fb));
}
else if (style == AST_SUBTRACT)
{
output.s.red = clamp((int)(background.s.red - fr));
output.s.green = clamp((int)(background.s.green - fg));
output.s.blue = clamp((int)(background.s.blue - fb));
}
else if (style == AST_REVERSESUBTRACT)
{
output.s.red = clamp((int)((-background.s.red) + fr));
output.s.green = clamp((int)((-background.s.green) + fg));
output.s.blue = clamp((int)((-background.s.blue) + fb));
}
else if (style == AST_MODULATE)
{
fr = ((float)foreground.s.red / 256.0f);
fg = ((float)foreground.s.green / 256.0f);
fb = ((float)foreground.s.blue / 256.0f);
output.s.red = clamp((int)(background.s.red * fr));
output.s.green = clamp((int)(background.s.green * fg));
output.s.blue = clamp((int)(background.s.blue * fb));
}
// just copy the pixel
else if (style == AST_COPY)
return background;
}
#undef clamp
// unimplemented blend modes return the background pixel
output = background;
output.s.alpha = 0xFF;
return output;
}
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);
}
// just copy the pixel
else if (style == AST_COPY)
return background;
// use ASTBlendPixel for all other blend modes
// and find the nearest colour in the palette
else if (style != AST_TRANSLUCENT)
{
RGBA_t texel;
RGBA_t bg = V_GetColor(background);
RGBA_t fg = V_GetColor(foreground);
texel = ASTBlendPixel(bg, fg, style, alpha);
return NearestColor(texel.s.red, texel.s.green, texel.s.blue);
}
// fallback if all above fails, somehow
// return the background pixel
return background;
}
//
// R_DrawTransColumnInCache
// R_DrawBlendColumnInCache
// Draws a translucent column into the cache, applying a half-cooked equation to get a proper translucency value (Needs code in R_GenerateTexture()).
//
static inline void R_DrawTransColumnInCache(column_t *patch, UINT8 *cache, texpatch_t *originPatch, INT32 cacheheight, INT32 patchheight)
static inline void R_DrawBlendColumnInCache(column_t *patch, UINT8 *cache, texpatch_t *originPatch, INT32 cacheheight, INT32 patchheight)
{
INT32 count, position;
UINT8 *source, *dest;
UINT8 *mytransmap = transtables + ((8*(originPatch->alpha) + 255/8)/(255 - 255/11) << FF_TRANSSHIFT); // The equation's not exact but it works as intended. I'll call it a day for now.
INT32 topdelta, prevdelta = -1;
INT32 originy = originPatch->originy;
@ -258,7 +353,8 @@ static inline void R_DrawTransColumnInCache(column_t *patch, UINT8 *cache, texpa
if (count > 0)
{
for (; dest < cache + position + count; source++, dest++)
if (*dest != 0xFF) *dest = *(mytransmap + ((*dest)<<8) + (*source));
if (*dest != 0xFF)
*dest = ASTBlendPixel_8bpp(*dest, *source, originPatch->style, originPatch->alpha);
}
patch = (column_t *)((UINT8 *)patch + patch->length + 4);
@ -269,11 +365,10 @@ static inline void R_DrawTransColumnInCache(column_t *patch, UINT8 *cache, texpa
// R_DrawTransColumnInCache
// Similar to the one above except that the column is inverted.
//
static inline void R_DrawTransFlippedColumnInCache(column_t *patch, UINT8 *cache, texpatch_t *originPatch, INT32 cacheheight, INT32 patchheight)
static inline void R_DrawBlendFlippedColumnInCache(column_t *patch, UINT8 *cache, texpatch_t *originPatch, INT32 cacheheight, INT32 patchheight)
{
INT32 count, position;
UINT8 *source, *dest;
UINT8 *mytransmap = transtables + ((8*(originPatch->alpha) + 255/8)/(255 - 255/11) << FF_TRANSSHIFT); // The equation's not exact but it works as intended. I'll call it a day for now.
INT32 topdelta, prevdelta = -1;
INT32 originy = originPatch->originy;
@ -302,7 +397,8 @@ static inline void R_DrawTransFlippedColumnInCache(column_t *patch, UINT8 *cache
if (count > 0)
{
for (; dest < cache + position + count; --source, dest++)
if (*dest != 0xFF) *dest = *(mytransmap + ((*dest)<<8) + (*source));
if (*dest != 0xFF)
*dest = ASTBlendPixel_8bpp(*dest, *source, originPatch->style, originPatch->alpha);
}
patch = (column_t *)((UINT8 *)patch + patch->length + 4);
@ -422,16 +518,10 @@ static UINT8 *R_GenerateTexture(size_t texnum)
for (i = 0, patch = texture->patches; i < texture->patchcount; i++, patch++)
{
static void (*ColumnDrawerPointer)(column_t *, UINT8 *, texpatch_t *, INT32, INT32); // Column drawing function pointer.
if ((patch->style == AST_TRANSLUCENT) && (patch->alpha <= (10*255/11))) // Alpha style set to translucent? Is the alpha small enough for translucency?
{
if (patch->alpha < 255/11) // Is the patch way too translucent? Don't render then.
continue;
ColumnDrawerPointer = (patch->flip & 2) ? R_DrawTransFlippedColumnInCache : R_DrawTransColumnInCache;
}
if (patch->style != AST_COPY)
ColumnDrawerPointer = (patch->flip & 2) ? R_DrawBlendFlippedColumnInCache : R_DrawBlendColumnInCache;
else
{
ColumnDrawerPointer = (patch->flip & 2) ? R_DrawFlippedColumnInCache : R_DrawColumnInCache;
}
realpatch = W_CacheLumpNumPwad(patch->wad, patch->lump, PU_CACHE);
x1 = patch->originx;
@ -848,8 +938,16 @@ static texpatch_t *R_ParsePatch(boolean actuallyLoadPatch)
{
Z_Free(texturesToken);
texturesToken = M_GetToken(NULL);
if(stricmp(texturesToken, "TRANSLUCENT")==0)
if (stricmp(texturesToken, "TRANSLUCENT")==0)
style = AST_TRANSLUCENT;
else if (stricmp(texturesToken, "ADD")==0)
style = AST_ADD;
else if (stricmp(texturesToken, "SUBTRACT")==0)
style = AST_SUBTRACT;
else if (stricmp(texturesToken, "REVERSESUBTRACT")==0)
style = AST_REVERSESUBTRACT;
else if (stricmp(texturesToken, "MODULATE")==0)
style = AST_MODULATE;
}
else if (stricmp(texturesToken, "FLIPX")==0)
flip |= 1;
@ -1615,7 +1713,6 @@ extracolormap_t *R_ColormapForName(char *name)
//
static double deltas[256][3], map[256][3];
static UINT8 NearestColor(UINT8 r, UINT8 g, UINT8 b);
static int RoundUp(double number);
lighttable_t *R_CreateLightTable(extracolormap_t *extra_colormap)
@ -2027,7 +2124,7 @@ extracolormap_t *R_AddColormaps(extracolormap_t *exc_augend, extracolormap_t *ex
// Thanks to quake2 source!
// utils3/qdata/images.c
static UINT8 NearestColor(UINT8 r, UINT8 g, UINT8 b)
UINT8 NearestColor(UINT8 r, UINT8 g, UINT8 b)
{
int dr, dg, db;
int distortion, bestdistortion = 256 * 256 * 4, bestcolor = 0, i;

7
src/r_data.h
View File

@ -22,7 +22,12 @@
#endif
// Possible alpha types for a patch.
enum patchalphastyle {AST_COPY, AST_TRANSLUCENT}; // , AST_ADD, AST_SUBTRACT, AST_REVERSESUBTRACT, AST_MODULATE, AST_OVERLAY};
enum patchalphastyle {AST_COPY, AST_TRANSLUCENT, AST_ADD, AST_SUBTRACT, AST_REVERSESUBTRACT, AST_MODULATE, AST_OVERLAY};
RGBA_t ASTBlendPixel(RGBA_t background, RGBA_t foreground, int style, UINT8 alpha);
UINT8 ASTBlendPixel_8bpp(UINT8 background, UINT8 foreground, int style, UINT8 alpha);
UINT8 NearestColor(UINT8 r, UINT8 g, UINT8 b);
// moved here for r_sky.c (texpatch_t is used)