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;