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Proper cache checking for textures - thanks to LordHavoc for the fast and

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cheap crc (which isn't a real crc, but does the job)
This commit is contained in:
Joseph Carter 2000-06-09 22:28:08 +00:00
parent a4243ac120
commit 6168fcebcc
1 changed files with 28 additions and 17 deletions
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45
source/gl_draw.c
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@ -74,6 +74,9 @@ extern byte *draw_chars; // 8*8 graphic characters
qpic_t *draw_disc;
qpic_t *draw_backtile;
int ltexcrctable[256]; // cache mismatch checking --KB
int translate_texture;
int char_texture;
int cs_texture; // crosshair texture
@ -112,6 +115,7 @@ typedef struct
char identifier[64];
int width, height;
qboolean mipmap;
int crc; // not really a standard CRC, but it works
} gltexture_t;
#define MAX_GLTEXTURES 1024
@ -1334,8 +1338,18 @@ GL_LoadTexture
int GL_LoadTexture (char *identifier, int width, int height, byte *data, qboolean mipmap, qboolean alpha)
{
int i;
int s;
int lcrc;
gltexture_t *glt;
// LordHavoc's cache check, not a standard crc but it works --KB
lcrc = 0;
s = width*height; // size
for (i = 0; i < 256; i++)
ltexcrctable[i] = i + 1;
for (i = 0; i < s; i++)
lcrc += (ltexcrctable[data[i] & 255]++);
// see if the texture is allready present
if (identifier[0])
{
@ -1343,37 +1357,34 @@ int GL_LoadTexture (char *identifier, int width, int height, byte *data, qboolea
{
if (!strcmp (identifier, glt->identifier))
{
if (width != glt->width || height != glt->height)
{
glt->width = width;
glt->height = height;
glt->mipmap = mipmap;
GL_Bind (glt->texnum);
GL_Upload8 (data, width, height, mipmap, alpha);
}
return gltextures[i].texnum;
if (lcrc != glt->crc
|| width != glt->width
|| height != glt->height)
goto SetupTexture;
else
return gltextures[i].texnum;
}
}
}
else
glt = &gltextures[numgltextures];
glt = &gltextures[numgltextures];
numgltextures++;
strcpy (glt->identifier, identifier);
glt->texnum = texture_extension_number;
texture_extension_number++;
SetupTexture:
glt->crc = lcrc;
glt->width = width;
glt->height = height;
glt->mipmap = mipmap;
GL_Bind(texture_extension_number );
GL_Bind(glt->texnum);
GL_Upload8 (data, width, height, mipmap, alpha);
texture_extension_number++;
return texture_extension_number-1;
return glt->texnum;
}
/*