diff options
| author | Kenneth Graunke <[email protected]> | 2014-02-10 11:06:03 -0800 |
|---|---|---|
| committer | Kenneth Graunke <[email protected]> | 2014-02-19 15:35:53 -0800 |
| commit | 6eeae17c02267c57ba3f9f2ace6252fb50dbc9ec (patch) | |
| tree | 470309866edbe57c0054c78975327fdff5ce0869 /src/mesa/drivers | |
| parent | 2ed5824a5d5400d1534139d2bda9858b95b67234 (diff) | |
i965: Use ffs() for sample counting in gen7_surface_msaa_bits().
The enumerations are just log2(num_samples) shifted by 3, which we can
easily compute via ffs().
This also makes it reusable for Broadwell, which has 2x MSAA.
Signed-off-by: Kenneth Graunke <[email protected]>
Reviewed-by: Eric Anholt <[email protected]>
Reviewed-by: Anuj Phogat <[email protected]>
Diffstat (limited to 'src/mesa/drivers')
| -rw-r--r-- | src/mesa/drivers/dri/i965/gen7_wm_surface_state.c | 10 |
1 files changed, 4 insertions, 6 deletions
diff --git a/src/mesa/drivers/dri/i965/gen7_wm_surface_state.c b/src/mesa/drivers/dri/i965/gen7_wm_surface_state.c index 12d0fa9de58..154a0fdd83c 100644 --- a/src/mesa/drivers/dri/i965/gen7_wm_surface_state.c +++ b/src/mesa/drivers/dri/i965/gen7_wm_surface_state.c @@ -82,12 +82,10 @@ gen7_surface_msaa_bits(unsigned num_samples, enum intel_msaa_layout layout) { uint32_t ss4 = 0; - if (num_samples > 4) - ss4 |= GEN7_SURFACE_MULTISAMPLECOUNT_8; - else if (num_samples > 1) - ss4 |= GEN7_SURFACE_MULTISAMPLECOUNT_4; - else - ss4 |= GEN7_SURFACE_MULTISAMPLECOUNT_1; + assert(num_samples <= 8); + + /* The SURFACE_MULTISAMPLECOUNT_X enums are simply log2(num_samples) << 3. */ + ss4 |= (ffs(MAX2(num_samples, 1)) - 1) << 3; if (layout == INTEL_MSAA_LAYOUT_IMS) ss4 |= GEN7_SURFACE_MSFMT_DEPTH_STENCIL; |