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fix texture twiddle

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This commit is contained in:
Hayden K 2019-03-27 19:19:30 -04:00
parent 535e361516
commit ef5b033b3a
1 changed files with 10 additions and 3 deletions

13
GL/texture.c
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@ -938,14 +938,21 @@ void APIENTRY glTexImage2D(GLenum target, GLint level, GLint internalFormat,
if(needsTwiddling) {
assert(type == GL_UNSIGNED_BYTE); // Anything else needs this loop adjusting
GLuint x, y, min, mask;
min = MIN(w, h);
min2 = min * min;
mask = min - 1;
for(y = 0; y < h; y++) {
uint8 * pixels;
uint16 * vtex;
pixels = (uint8 *) data;
vtex = (uint16*)targetData;
for(y = 0; y < h; y += 2) {
for(x = 0; x < w; x++) {
targetData[TWIDOUT(x & mask, y & mask) + (x / min + y / min) * min2] = ((GLubyte*) data)[y * w + x];
vtex[TWIDOUT((y & mask) / 2, x & mask) +
(x / min + y / min)*min * min / 2] =
pixels[y * w + x] | (pixels[(y + 1) * w + x] << 8);
}
}
} else {