diff options
author | Neil Roberts <[email protected]> | 2015-05-08 17:35:18 +0100 |
---|---|---|
committer | Neil Roberts <[email protected]> | 2015-05-11 12:09:20 +0100 |
commit | bfdae9149e00bd5c2521db3e75669ae043eed5cc (patch) | |
tree | 2ba0c91e864508910419efdf259fa0aa34980615 | |
parent | abf3fefa1aa734844e0ca8e95e8c3a501909aa33 (diff) |
i965/fs: Disable opt_sampler_eot for textureGather
The opt_sampler_eot optimisation seems to break when the last
instruction is SHADER_OPCODE_TG4. A bunch of Piglit tests end up doing
this so it causes a lot of regressions. I can't find any documentation
or known workarounds to indicate that this is expected behaviour, but
considering that this is probably a pretty unlikely situation in a
real use case we might as well disable it in order to avoid the
regressions. In total this fixes 451 tests.
Reviewed-by: Ben Widawsky <[email protected]>
Reviewed-by: Chris Forbes <[email protected]>
-rw-r--r-- | src/mesa/drivers/dri/i965/brw_fs.cpp | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp b/src/mesa/drivers/dri/i965/brw_fs.cpp index b2701b89689..3414d92efde 100644 --- a/src/mesa/drivers/dri/i965/brw_fs.cpp +++ b/src/mesa/drivers/dri/i965/brw_fs.cpp @@ -2658,6 +2658,16 @@ fs_visitor::opt_sampler_eot() if (unlikely(tex_inst->is_head_sentinel()) || !tex_inst->is_tex()) return false; + /* This optimisation doesn't seem to work for textureGather for some + * reason. I can't find any documentation or known workarounds to indicate + * that this is expected, but considering that it is probably pretty + * unlikely that a shader would directly write out the results from + * textureGather we might as well just disable it. + */ + if (tex_inst->opcode == SHADER_OPCODE_TG4 || + tex_inst->opcode == SHADER_OPCODE_TG4_OFFSET) + return false; + /* If there's no header present, we need to munge the LOAD_PAYLOAD as well. * It's very likely to be the previous instruction. */ |