diff options
| author | Paul Berry <[email protected]> | 2013-11-27 07:43:03 -0800 |
|---|---|---|
| committer | Paul Berry <[email protected]> | 2013-11-29 21:46:31 -0800 |
| commit | c4cf487315f1f5375534f1677177983fa496d577 (patch) | |
| tree | a41225a8883ff53c731a11d2e6c11ac4830e6cf9 /docs/README.MITS | |
| parent | 26498e0f0c198ac912b176cf9a14768ad2c0244c (diff) | |
i965/gen6: Fix multisample resolve blits for luminance/intensity 32F formats.
On gen6, multisamble resolve blits use the SAMPLE message to blend
together the 4 samples for each texel. For some reason, SAMPLE
doesn't blend together the proper samples when the source format is
L32_FLOAT or I32_FLOAT, resulting in blocky artifacts.
To work around this problem, sample from the source surface using
R32_FLOAT. This shouldn't affect rendering correctness, because when
doing these resolve blits, the destination format is R32_FLOAT, so the
channel replication done by L32_FLOAT and I32_FLOAT is unnecessary.
Fixes piglit tests on Sandy Bridge:
- spec/ARB_texture_float/multisample-formats 2 GL_ARB_texture_float
- spec/ARB_texture_float/multisample-formats 4 GL_ARB_texture_float
No piglit regressions on Sandy Bridge.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=70601
Cc: Kenneth Graunke <[email protected]>
Cc: [email protected]
Reviewed-by: Kenneth Graunke <[email protected]>
Diffstat (limited to 'docs/README.MITS')
0 files changed, 0 insertions, 0 deletions