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| author | Brian Paul <brianp@vmware.com> | 2010-01-15 11:26:35 -0700 |
|---|---|---|
| committer | Brian Paul <brianp@vmware.com> | 2010-01-15 11:26:35 -0700 |
| commit | 12ba9e99db51a4a9e2e28a0574ef59f6548d8a84 (patch) | |
| tree | 878cb71a34838d8b00773230398d6cfc3d9d4c8a /src/gallium/drivers/llvmpipe/lp_rast_tri.c | |
| parent | 4bef3575e605d890d9f228391b4724d27b025f49 (diff) | |
llvmpipe: added comment about lookup-tables vs. computation
Diffstat (limited to 'src/gallium/drivers/llvmpipe/lp_rast_tri.c')
| -rw-r--r-- | src/gallium/drivers/llvmpipe/lp_rast_tri.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/src/gallium/drivers/llvmpipe/lp_rast_tri.c b/src/gallium/drivers/llvmpipe/lp_rast_tri.c index 9c3f699ec7..92769beee1 100644 --- a/src/gallium/drivers/llvmpipe/lp_rast_tri.c +++ b/src/gallium/drivers/llvmpipe/lp_rast_tri.c @@ -40,6 +40,9 @@ * Map an index in [0,15] to an x,y position, multiplied by 4. * This is used to get the position of each subtile in a 4x4 * grid of edge step values. + * Note: we can use some bit twiddling to compute these values instead + * of using a look-up table, but there's no measurable performance + * difference. */ static const int pos_table4[16][2] = { { 0, 0 }, |