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.
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@ -187,17 +187,33 @@ void lp_rast_clear_color( struct lp_rasterizer *rast,
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if (clear_color[0] == clear_color[1] &&
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clear_color[1] == clear_color[2] &&
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clear_color[2] == clear_color[3]) {
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/* clear to grayscale value {x, x, x, x} */
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for (i = 0; i < rast->state.fb.nr_cbufs; i++) {
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memset(color_tile[i], clear_color[0], TILE_SIZE * TILE_SIZE * 4);
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}
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}
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else {
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unsigned x, y, chan;
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for (i = 0; i < rast->state.fb.nr_cbufs; i++)
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for (y = 0; y < TILE_SIZE; y++)
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for (x = 0; x < TILE_SIZE; x++)
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for (chan = 0; chan < 4; ++chan)
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TILE_PIXEL(color_tile[i], x, y, chan) = clear_color[chan];
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/* Non-gray color.
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* Note: if the swizzled tile layout changes (see TILE_PIXEL) this code
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* will need to change. It'll be pretty obvious when clearing no longer
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* works.
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*/
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const unsigned chunk = TILE_SIZE / 4;
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for (i = 0; i < rast->state.fb.nr_cbufs; i++) {
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uint8_t *c = color_tile[i];
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unsigned j;
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for (j = 0; j < 4 * TILE_SIZE; j++) {
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memset(c, clear_color[0], chunk);
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c += chunk;
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memset(c, clear_color[1], chunk);
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c += chunk;
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memset(c, clear_color[2], chunk);
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c += chunk;
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memset(c, clear_color[3], chunk);
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c += chunk;
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}
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assert(c - color_tile[i] == TILE_SIZE * TILE_SIZE * 4);
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}
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}
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}
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