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Add rudimentary and non-working code for translucency on patches.

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This commit is contained in:
Nevur 2017-03-04 20:59:43 +01:00
parent cfb5a9d904
commit bb49362577
2 changed files with 51 additions and 1 deletions
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47
src/r_data.c
View file

@ -211,6 +211,41 @@ static inline void R_DrawFlippedColumnInCache(column_t *patch, UINT8 *cache, INT
patch = (column_t *)((UINT8 *)patch + patch->length + 4);
}
}
R_DrawTranslucentColumn_8()
static inline void R_DrawTransColumnInCache(column_t *patch, UINT8 *cache, INT32 originy, INT32 cacheheight)
{
INT32 count, position;
UINT8 *source;
INT32 topdelta, prevdelta = -1;
while (patch->topdelta != 0xff)
{
topdelta = patch->topdelta;
if (topdelta <= prevdelta)
topdelta += prevdelta;
prevdelta = topdelta;
source = (UINT8 *)patch + 3;
count = patch->length;
position = originy + topdelta;
if (position < 0)
{
count += position;
source -= position; // start further down the column
position = 0;
}
if (position + count > cacheheight)
count = cacheheight - position;
if (count > 0)
M_Memcpy(cache + position, source, count);
patch = (column_t *)((UINT8 *)patch + patch->length + 4);
}
}
//
// R_GenerateTexture
@ -588,6 +623,8 @@ static texpatch_t *R_ParsePatch(boolean actuallyLoadPatch)
INT16 patchXPos;
INT16 patchYPos;
UINT8 flip = 0;
UINT8 alpha = 255;
enum patchalphastyle style = AST_COPY;
texpatch_t *resultPatch = NULL;
lumpnum_t patchLumpNum;
@ -703,7 +740,13 @@ static texpatch_t *R_ParsePatch(boolean actuallyLoadPatch)
}
while (strcmp(texturesToken,"}")!=0)
{
if (stricmp(texturesToken, "FLIPX")==0)
if (stricmp(texturesToken, "ALPHA")==0)
{
Z_Free(texturesToken);
texturesToken = M_GetToken(NULL);
alpha = 255*strtof(texturesToken, NULL);
}
else if (stricmp(texturesToken, "FLIPX")==0)
flip |= 1;
else if (stricmp(texturesToken, "FLIPY")==0)
flip |= 2;
@ -736,6 +779,8 @@ static texpatch_t *R_ParsePatch(boolean actuallyLoadPatch)
resultPatch->lump = patchLumpNum & 65535;
resultPatch->wad = patchLumpNum>>16;
resultPatch->flip = flip;
resultPatch->alpha = alpha;
resultPatch->style = style;
// Clean up a little after ourselves
Z_Free(patchName);
// Then return it

5
src/r_data.h
View file

@ -21,6 +21,9 @@
#pragma interface
#endif
// Possible alpha types for a patch.
enum patchalphastyle {AST_COPY, AST_TRANSLUCENT}; // , AST_ADD, AST_SUBTRACT, AST_REVERSESUBTRACT, AST_MODULATE, AST_OVERLAY};
// moved here for r_sky.c (texpatch_t is used)
// A single patch from a texture definition,
@ -32,6 +35,8 @@ typedef struct
INT16 originx, originy;
UINT16 wad, lump;
UINT8 flip; // 1 = flipx, 2 = flipy, 3 = both
UINT8 alpha; // Translucency value
enum patchalphastyle style;
} texpatch_t;
// A maptexturedef_t describes a rectangular texture,