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fixed bug scanning min and max alpha values

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This commit is contained in:
koolsmoky
2004-02-08 18:28:26 +00:00
parent 26c4247cdd
commit 2dbc6d696e
1 changed files with 9 additions and 8 deletions
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17
swlibs/texus2/lib/quantize.c
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@@ -998,7 +998,7 @@ _txImgConvert_ARGB565DErr(FxU32* dst, const FxU32* src, FxU32 format, int srcW,
/* scan for the min and max values */
if (rawAlpha < minAlpha) minAlpha = rawAlpha;
if (rawAlpha > maxAlpha) minAlpha = rawAlpha;
if (rawAlpha > maxAlpha) maxAlpha = rawAlpha;
/* sum of the alpha's */
blockAlphaSum += rawAlpha;
@@ -1009,9 +1009,9 @@ _txImgConvert_ARGB565DErr(FxU32* dst, const FxU32* src, FxU32 format, int srcW,
(format == GR_TEXFMT_ARGB_CMP_DXT5)) {
if ((minAlpha == 0x00UL) &&
(maxAlpha == 0xFFUL)) {
return 0xFFUL; /* signal 6-alpha block encode for dxt4,5 */
return 0xFFUL; /* signal 6-alpha block encoding for dxt4,5 */
} else {
return 0x00UL; /* signal 8-alpha block encode for dxt4,5 */
return 0x00UL; /* signal 8-alpha block encoding for dxt4,5 */
}
}
@@ -1049,11 +1049,12 @@ _txImgQuantizeDXT1(FxU16* dst, const FxU32* src,
if (avgAlpha != 0xFFUL) /* we have varying alpha. do the 3-color encoding. */
{
/* set the threshold */
const FxU32 alphaThresh = 0x7FUL; /* According to OpenGL spec, a texel with an alpha component
* smaller than 0x7FUL will end up with 0x00UL alpha (black) and
* one with an alpha component equal to or larger than 0x7FUL will
* end up with 0xFFUL alpha.
*/
/* According to OpenGL spec, a texel with an alpha component
* smaller than 0x7FUL will end up with 0x00UL alpha (black) and
* one with an alpha component equal to or larger than 0x7FUL will
* end up with 0xFFUL alpha.
*/
const FxU32 alphaThresh = 0x7FUL;
for(t = 0; t < h; t += 4) {
for(s = 0; s < w; s += 4) {