Mesa (master): i965: Generalize coord+offset lowering pass for ir_txf

[Chris Forbes]

Module: Mesa
Branch: master
Commit: 06de9f8ff15559dffddf26d1969d35e74fbf253f
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=06de9f8ff15559dffddf26d1969d35e74fbf253f

Author: Chris Forbes <chrisf at ijw.co.nz>
Date:   Sun Oct 13 00:02:55 2013 +1300

i965: Generalize coord+offset lowering pass for ir_txf

ir_txf expects an ivec* coordinate, and may be larger than ivec2;
shuffle things around so that this will work.

V2: Fix style nits, use ir_builder

Signed-off-by: Chris Forbes <chrisf at ijw.co.nz>
Reviewed-by: Kenneth Graunke <kenneth at whitecape.org>

---

 .../dri/i965/brw_lower_unnormalized_offset.cpp     |   29 +++++++++++++++++--
 1 files changed, 26 insertions(+), 3 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/brw_lower_unnormalized_offset.cpp b/src/mesa/drivers/dri/i965/brw_lower_unnormalized_offset.cpp
index 0581e05..df4fe4b 100644
--- a/src/mesa/drivers/dri/i965/brw_lower_unnormalized_offset.cpp
+++ b/src/mesa/drivers/dri/i965/brw_lower_unnormalized_offset.cpp
@@ -52,11 +52,34 @@ public:
 ir_visitor_status
 brw_lower_unnormalized_offset_visitor::visit_leave(ir_texture *ir)
 {
-   if (ir->sampler->type->sampler_dimensionality != GLSL_SAMPLER_DIM_RECT ||
-       !ir->offset || ir->op != ir_tg4)
+   if (!ir->offset)
       return visit_continue;
 
-   ir->coordinate = add(ir->coordinate, i2f(ir->offset));
+   if (ir->op == ir_tg4) {
+      if (ir->sampler->type->sampler_dimensionality != GLSL_SAMPLER_DIM_RECT)
+         return visit_continue;
+   }
+   else if (ir->op != ir_txf) {
+      return visit_continue;
+   }
+
+   void *mem_ctx = ralloc_parent(ir);
+
+   if (ir->op == ir_txf) {
+      ir_variable *var = new(mem_ctx) ir_variable(ir->coordinate->type,
+                                                  "coordinate",
+                                                  ir_var_temporary);
+      base_ir->insert_before(var);
+      base_ir->insert_before(assign(var, ir->coordinate));
+      base_ir->insert_before(assign(var,
+               add(swizzle_for_size(var, ir->offset->type->vector_elements), ir->offset),
+               (1 << ir->offset->type->vector_elements) - 1));
+
+      ir->coordinate = new(mem_ctx) ir_dereference_variable(var);
+   } else {
+      ir->coordinate = add(ir->coordinate, i2f(ir->offset));
+   }
+
    ir->offset = NULL;
 
    progress = true;