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Trying to make sense of chroma keying

This commit is contained in:
Jaime Passos 2019-11-09 14:09:20 -03:00
parent a9e3e0c00e
commit 61164ea310
3 changed files with 17 additions and 26 deletions
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40
src/hardware/hw_cache.c
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@ -32,10 +32,6 @@
#include "../r_draw.h"
#include "../p_setup.h"
//Hurdler: 25/04/2000: used for new colormap code in hardware mode
//static UINT8 *gr_colormap = NULL; // by default it must be NULL ! (because colormap tables are not initialized)
boolean firetranslucent = false;
// Values set after a call to HWR_ResizeBlock()
static INT32 blocksize, blockwidth, blockheight;
@ -121,18 +117,16 @@ static void HWR_DrawColumnInCache(const column_t *patchcol, UINT8 *block, GLMipm
texel = source[yfrac>>FRACBITS];
if (firetranslucent && (transtables[(texel<<8)+0x40000]!=texel))
alpha = 0x80;
//Hurdler: 25/04/2000: now support colormap in hardware mode
if (mipmap->colormap)
texel = mipmap->colormap[texel];
// transparent pixel
if (texel == HWR_PATCHES_CHROMAKEY_COLORINDEX)
alpha = 0x00;
else
alpha = 0xff;
//Hurdler: not perfect, but better than holes
if (texel == HWR_PATCHES_CHROMAKEY_COLORINDEX && (mipmap->flags & TF_CHROMAKEYED))
texel = HWR_CHROMAKEY_EQUIVALENTCOLORINDEX;
//Hurdler: 25/04/2000: now support colormap in hardware mode
else if (mipmap->colormap)
texel = mipmap->colormap[texel];
// hope compiler will get this switch out of the loops (dreams...)
// gcc do it ! but vcc not ! (why don't use cygwin gcc for win32 ?)
// Alam: SRB2 uses Mingw, HUGS
@ -235,18 +229,16 @@ static void HWR_DrawFlippedColumnInCache(const column_t *patchcol, UINT8 *block,
texel = source[yfrac>>FRACBITS];
if (firetranslucent && (transtables[(texel<<8)+0x40000]!=texel))
alpha = 0x80;
//Hurdler: 25/04/2000: now support colormap in hardware mode
if (mipmap->colormap)
texel = mipmap->colormap[texel];
// transparent pixel
if (texel == HWR_PATCHES_CHROMAKEY_COLORINDEX)
alpha = 0x00;
else
alpha = 0xff;
//Hurdler: not perfect, but better than holes
if (texel == HWR_PATCHES_CHROMAKEY_COLORINDEX && (mipmap->flags & TF_CHROMAKEYED))
texel = HWR_CHROMAKEY_EQUIVALENTCOLORINDEX;
//Hurdler: 25/04/2000: now support colormap in hardware mode
else if (mipmap->colormap)
texel = mipmap->colormap[texel];
// hope compiler will get this switch out of the loops (dreams...)
// gcc do it ! but vcc not ! (why don't use cygwin gcc for win32 ?)
// Alam: SRB2 uses Mingw, HUGS
@ -612,7 +604,7 @@ static UINT8 *MakeBlock(GLMipmap_t *grMipmap)
{
UINT8 *block;
INT32 bpp, i;
UINT16 bu16 = ((0x00 <<8) | HWR_CHROMAKEY_EQUIVALENTCOLORINDEX);
UINT16 bu16 = ((0x00 <<8) | HWR_PATCHES_CHROMAKEY_COLORINDEX);
bpp = format2bpp[grMipmap->grInfo.format];
block = Z_Malloc(blocksize*bpp, PU_HWRCACHE, &(grMipmap->grInfo.data));
@ -675,7 +667,7 @@ static void HWR_GenerateTexture(INT32 texnum, GLTexture_t *grtex)
INT32 j;
RGBA_t col;
col = V_GetColor(HWR_CHROMAKEY_EQUIVALENTCOLORINDEX);
col = V_GetColor(HWR_PATCHES_CHROMAKEY_COLORINDEX);
for (j = 0; j < blockheight; j++)
{
for (i = 0; i < blockwidth; i++)

2
src/hardware/hw_defs.h
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@ -42,7 +42,7 @@ typedef unsigned char FBOOLEAN;
// byte value for paletted graphics, which represent the transparent color
#define HWR_PATCHES_CHROMAKEY_COLORINDEX 255
#define HWR_CHROMAKEY_EQUIVALENTCOLORINDEX 130
//#define HWR_CHROMAKEY_EQUIVALENTCOLORINDEX 130
// the chroma key color shows on border sprites, set it to black
#define HWR_PATCHES_CHROMAKEY_COLORVALUE (0x00000000) //RGBA format as in grSstWinOpen()

1
src/hardware/hw_glob.h
View File

@ -123,6 +123,5 @@ extern consvar_t cv_grrounddown; // on/off
extern INT32 patchformat;
extern INT32 textureformat;
extern boolean firetranslucent;
#endif //_HW_GLOB_