diff options
| -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; |