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llvmpipe: optimize lp_rast_clear_color() for non-gray colors 

This makes a big difference in progs that clear to a non-gray color.
Some demos are 30-50% faster.
This commit is contained in:
Brian Paul 2010-01-13 18:54:48 -07:00
parent f19f218e7a
commit f94a99170e
1 changed files with 22 additions and 6 deletions
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28
src/gallium/drivers/llvmpipe/lp_rast.c
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@ -187,17 +187,33 @@ void lp_rast_clear_color( struct lp_rasterizer *rast,
if (clear_color[0] == clear_color[1] &&
clear_color[1] == clear_color[2] &&
clear_color[2] == clear_color[3]) {
/* clear to grayscale value {x, x, x, x} */
for (i = 0; i < rast->state.fb.nr_cbufs; i++) {
memset(color_tile[i], clear_color[0], TILE_SIZE * TILE_SIZE * 4);
}
}
else {
unsigned x, y, chan;
for (i = 0; i < rast->state.fb.nr_cbufs; i++)
for (y = 0; y < TILE_SIZE; y++)
for (x = 0; x < TILE_SIZE; x++)
for (chan = 0; chan < 4; ++chan)
TILE_PIXEL(color_tile[i], x, y, chan) = clear_color[chan];
/* Non-gray color.
* Note: if the swizzled tile layout changes (see TILE_PIXEL) this code
* will need to change. It'll be pretty obvious when clearing no longer
* works.
*/
const unsigned chunk = TILE_SIZE / 4;
for (i = 0; i < rast->state.fb.nr_cbufs; i++) {
uint8_t *c = color_tile[i];
unsigned j;
for (j = 0; j < 4 * TILE_SIZE; j++) {
memset(c, clear_color[0], chunk);
c += chunk;
memset(c, clear_color[1], chunk);
c += chunk;
memset(c, clear_color[2], chunk);
c += chunk;
memset(c, clear_color[3], chunk);
c += chunk;
}
assert(c - color_tile[i] == TILE_SIZE * TILE_SIZE * 4);
}
}
}