Mesa (master): i965: fs: Add fixup for textureSize on Gen6/7

[Eric Anholt]

Module: Mesa
Branch: master
Commit: d2dbba87554d9490b49884185a29ca2b46e4a616
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=d2dbba87554d9490b49884185a29ca2b46e4a616

Author: Chris Forbes <chrisf at ijw.co.nz>
Date:   Thu Nov 22 22:13:46 2012 +1300

i965: fs: Add fixup for textureSize on Gen6/7

V2: Moved up into emit(ir_texture *) to avoid duplication and fix
ordering for Gen7; Gen6 math quirks moved into previous patches.

Tested on Gen6 only; passes all the cube_map_array piglits.

V3: Fixed weird whitespace
V4: Use sampler->type; otherwise broken on arrays of samplers.
v5: Minor style fixes (by anholt)

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

---

 src/mesa/drivers/dri/i965/brw_fs_visitor.cpp |   11 +++++++++++
 1 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp b/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
index 6a39f98..708677f 100644
--- a/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
@@ -1371,6 +1371,17 @@ fs_visitor::visit(ir_texture *ir)
    if (ir->shadow_comparitor)
       inst->shadow_compare = true;
 
+   /* fixup #layers for cube map arrays */
+   if (ir->op == ir_txs) {
+      glsl_type const *type = ir->sampler->type;
+      if (type->sampler_dimensionality == GLSL_SAMPLER_DIM_CUBE &&
+          type->sampler_array) {
+         fs_reg depth = dst;
+         depth.reg_offset = 2;
+         emit_math(SHADER_OPCODE_INT_QUOTIENT, depth, depth, fs_reg(6));
+      }
+   }
+
    swizzle_result(ir, dst, sampler);
 }