From: Ian Romanick <ian.d.roman...@intel.com>
Volume 4, part 1 of the Ivybridge PRM says, "Generally, the EWA
approximation algorithm results in higher image quality than the legacy
algorithm." Using a classic anisotropic filtering "tunnel" demo, it
appears that there is *no* anisotropic filtering on IVB without this bit
set.
Signed-off-by: Ian Romanick <ian.d.roman...@intel.com>
Cc: Eero Tamminen <eero.t.tammi...@intel.com>
---
src/mesa/drivers/dri/i965/gen7_sampler_state.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/src/mesa/drivers/dri/i965/gen7_sampler_state.c
b/src/mesa/drivers/dri/i965/gen7_sampler_state.c
index 968c410..709a783 100644
--- a/src/mesa/drivers/dri/i965/gen7_sampler_state.c
+++ b/src/mesa/drivers/dri/i965/gen7_sampler_state.c
@@ -82,6 +82,7 @@ gen7_update_sampler_state(struct brw_context *brw, int unit,
int ss_index,
if (gl_sampler->MaxAnisotropy > 1.0) {
sampler->ss0.min_filter = BRW_MAPFILTER_ANISOTROPIC;
sampler->ss0.mag_filter = BRW_MAPFILTER_ANISOTROPIC;
+ sampler->ss0.aniso_algorithm = 1;
if (gl_sampler->MaxAnisotropy > 2.0) {
sampler->ss3.max_aniso = MIN2((gl_sampler->MaxAnisotropy - 2) / 2,
--
1.8.1.4
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