diff options
| author | Eric Anholt <eric@anholt.net> | 2010-03-02 15:28:36 -0800 |
|---|---|---|
| committer | Eric Anholt <eric@anholt.net> | 2010-03-03 11:33:37 -0800 |
| commit | 07439cf61717a3bde82745aa2acc878d7fd0133f (patch) | |
| tree | eaca9ba54e1a4465c0d2685a74ed18c61180e1e0 /src/mesa/drivers | |
| parent | 55e90e46e0f4f3f8b5da334d84fefb65b9b3d45b (diff) | |
i915: Don't do the pitch expansion for tiled buffers.
The weirdness that led to the bumping of pitch for those 512/1024
pixels is that in taking a 2x2 subspan or bilinear filtering we'd end
up hitting the same channel in 2 different pages, leading to lower
performance. With tiling, that doesn't occur, so we don't need to
waste the memory.
Diffstat (limited to 'src/mesa/drivers')
| -rw-r--r-- | src/mesa/drivers/dri/intel/intel_mipmap_tree.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/src/mesa/drivers/dri/intel/intel_mipmap_tree.c b/src/mesa/drivers/dri/intel/intel_mipmap_tree.c index cb5a341050..a20ea5afdb 100644 --- a/src/mesa/drivers/dri/intel/intel_mipmap_tree.c +++ b/src/mesa/drivers/dri/intel/intel_mipmap_tree.c @@ -238,11 +238,11 @@ int intel_miptree_pitch_align (struct intel_context *intel, pitch = ALIGN(pitch * mt->cpp, pitch_align); #ifdef I915 - /* XXX: At least the i915 seems very upset when the pitch is a multiple - * of 1024 and sometimes 512 bytes - performance can drop by several - * times. Go to the next multiple of the required alignment for now. + /* Do a little adjustment to linear allocations so that we avoid + * hitting the same channel of memory for 2 different pages when + * reading a 2x2 subspan or doing bilinear filtering. */ - if (!(pitch & 511) && + if (tiling == I915_TILING_NONE && !(pitch & 511) && (pitch + pitch_align) < (1 << ctx->Const.MaxTextureLevels)) pitch += pitch_align; #endif |