glsl: add support for ARB_texture_multisample

V2: - emit `sample` parameter properly for multisample texelFetch()
    - fix spurious whitespace change
    - introduce a new opcode ir_txf_ms rather than overloading the
      existing ir_txf further. This makes doing the right thing in
      the driver somewhat simpler.

V3: - fix weird whitespace

V4: - don't forget to include the new opcode in tex_opcode_strs[]
      (thanks Kenneth for spotting this)

Signed-off-by: Chris Forbes <[email protected]>
[V2] Reviewed-by: Eric Anholt <[email protected]>
[V2] Reviewed-by: Paul Berry <[email protected]>
Reviewed-by: Ian Romanick <[email protected]>

1 files changed, 4 insertions, 0 deletions

diff --git a/src/glsl/opt_tree_grafting.cpp b/src/glsl/opt_tree_grafting.cpp
index 113abb7b043..985540196be 100644
--- a/src/glsl/opt_tree_grafting.cpp
+++ b/src/glsl/opt_tree_grafting.cpp
@@ -285,6 +285,10 @@ ir_tree_grafting_visitor::visit_enter(ir_texture *ir)
       if (do_graft(&ir->lod_info.lod))
 	 return visit_stop;
       break;
+   case ir_txf_ms:
+      if (do_graft(&ir->lod_info.sample_index))
+         return visit_stop;
+      break;
    case ir_txd:
       if (do_graft(&ir->lod_info.grad.dPdx) ||
 	  do_graft(&ir->lod_info.grad.dPdy))