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llvmpipe: improve empty-bin test further

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Remove unused param, add comments.  Thanks to Brian for review.
This commit is contained in:
Keith Whitwell 2010-01-13 16:29:39 +00:00
parent f4b29e6ad3
commit db83ad4b43
1 changed files with 13 additions and 3 deletions
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16
src/gallium/drivers/llvmpipe/lp_rast.c
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@ -576,13 +576,23 @@ rasterize_bin( struct lp_rasterizer *rast,
lp_rast_end_tile( rast, thread_index );
}
/* An empty bin is one that just loads the contents of the tile and
* stores them again unchanged. This typically happens when bins have
* been flushed for some reason in the middle of a frame, or when
* incremental updates are being made to a render target.
*
* Try to avoid doing pointless work in this case.
*/
static boolean
is_empty_bin( struct lp_rasterizer *rast,
const struct cmd_bin *bin )
is_empty_bin( const struct cmd_bin *bin )
{
const struct cmd_block *head = bin->commands.head;
int i;
/* We emit at most two load-tile commands at the start of the first
* command block. If there are more than two commands in the
* block, we know that the bin is non-empty.
*/
if (head->next != NULL ||
head->count > 2)
return FALSE;
@ -626,7 +636,7 @@ rasterize_scene( struct lp_rasterizer *rast,
assert(scene);
while ((bin = lp_scene_bin_iter_next(scene, &x, &y))) {
if (!is_empty_bin( rast, bin ))
if (!is_empty_bin( bin ))
rasterize_bin( rast, thread_index, bin, x * TILE_SIZE, y * TILE_SIZE);
}
}