[Bug 89457] [BSW Bisected]ogles3conform ES3-CTS.gtf.GL3Tests.shadow.shadow_execution_vert fails

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89457

--- Comment #13 from Kristian Høgsberg <krh at bitplanet.net> ---
It looks like we have a fix. The SIMD8 sampler_c message tries to compute the
LOD, but that doesn't make sense for vertex shaders. Running this patch through
piglit now:

diff --git a/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
b/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
index 06337c9..155010d 100644
--- a/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
@@ -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:

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