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i965: Rewrite ir_tex to ir_txl with lod 0 for vertex shaders

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The ir_tex opcode turns into a sample or sample_c message, which will try to
compute derivatives to determine the lod. This produces garbage for
non-fragment shaders where the sample coordinates don't correspond to
subspans.

We fix this by rewriting the opcode from ir_tex to ir_txl and setting the
lod to 0.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=89457
Cc: "10.5" <mesa-stable@lists.freedesktop.org>
Signed-off-by: Kristian Høgsberg <kristian.h.kristensen@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
This commit is contained in:
Kristian Høgsberg 2015-04-14 15:02:18 +00:00
parent a7d018accf
commit 993a6288f7
1 changed files with 9 additions and 0 deletions
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9
src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
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@ -1839,6 +1839,15 @@ fs_visitor::emit_texture_gen7(ir_texture_opcode op, fs_reg dst,
offset_value.file != BAD_FILE && offset_value.file != IMM;
bool coordinate_done = false;
/* The sampler can only meaningfully compute LOD for fragment shader
* messages. For all other stages, we change the opcode to ir_txl and
* hardcode the LOD to 0.
*/
if (stage != MESA_SHADER_FRAGMENT && op == ir_tex) {
op = ir_txl;
lod = fs_reg(0.0f);
}
/* Set up the LOD info */
switch (op) {
case ir_tex: