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path: root/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
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Diffstat (limited to 'src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp')
-rw-r--r--src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp12
1 files changed, 12 insertions, 0 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp b/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
index c39f97e3962..b8f90f2aa20 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
+++ b/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
@@ -882,6 +882,18 @@ vec4_visitor::emit_texture(ir_texture_opcode op,
uint32_t sampler,
src_reg sampler_reg)
{
+ /* The sampler can only meaningfully compute LOD for fragment shader
+ * messages. For all other stages, we change the opcode to TXL and hardcode
+ * the LOD to 0.
+ *
+ * textureQueryLevels() is implemented in terms of TXS so we need to pass a
+ * valid LOD argument.
+ */
+ if (op == ir_tex || op == ir_query_levels) {
+ assert(lod.file == BAD_FILE);
+ lod = src_reg(0.0f);
+ }
+
enum opcode opcode;
switch (op) {
case ir_tex: opcode = SHADER_OPCODE_TXL; break;