Mesa (glsl-to-tgsi): glsl_to_tgsi: add each relative address to the previous

[Bryan Cain]

Module: Mesa
Branch: glsl-to-tgsi
Commit: 36e90af8f88a92cafaac62f57c92aa03c61ce9f3
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=36e90af8f88a92cafaac62f57c92aa03c61ce9f3

Author: Bryan Cain <bryancain3 at gmail.com>
Date:   Wed Jul 27 16:36:10 2011 -0500

glsl_to_tgsi: add each relative address to the previous

This is a glsl_to_tgsi port of commit d6e1a8f71437.

---

 src/mesa/state_tracker/st_glsl_to_tgsi.cpp |   12 ++++++++++++
 1 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
index 0cbfc94..f66e240 100644
--- a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
+++ b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
@@ -1741,6 +1741,18 @@ glsl_to_tgsi_visitor::visit(ir_dereference_array *ir)
               this->result, st_src_reg_for_float(element_size));
       }
 
+      /* If there was already a relative address register involved, add the
+       * new and the old together to get the new offset.
+       */
+      if (src.reladdr != NULL) {
+         st_src_reg accum_reg = get_temp(glsl_type::float_type);
+
+         emit(ir, TGSI_OPCODE_ADD, st_dst_reg(accum_reg),
+              index_reg, *src.reladdr);
+
+         index_reg = accum_reg;
+      }
+
       src.reladdr = ralloc(mem_ctx, st_src_reg);
       memcpy(src.reladdr, &index_reg, sizeof(index_reg));
    }