ir_to_mesa: Add each relative address to the previous

This fixes many cases of accessing arrays of matrices using
non-constant indices at each level.

Fixes i965 piglit:

    vs-temp-array-mat[234]-index-col-rd
    vs-temp-array-mat[234]-index-col-row-rd
    vs-temp-array-mat[234]-index-col-wr
    vs-uniform-array-mat[234]-index-col-rd

Fixes swrast piglit:

    fs-temp-array-mat[234]-index-col-rd
    fs-temp-array-mat[234]-index-col-row-rd
    fs-temp-array-mat[234]-index-col-wr
    fs-uniform-array-mat[234]-index-col-rd
    fs-uniform-array-mat[234]-index-col-row-rd
    fs-varying-array-mat[234]-index-col-rd
    fs-varying-array-mat[234]-index-col-row-rd
    vs-temp-array-mat[234]-index-col-rd
    vs-temp-array-mat[234]-index-col-row-rd
    vs-temp-array-mat[234]-index-col-wr
    vs-uniform-array-mat[234]-index-col-rd
    vs-uniform-array-mat[234]-index-col-row-rd
    vs-varying-array-mat[234]-index-col-rd
    vs-varying-array-mat[234]-index-col-row-rd
    vs-varying-array-mat[234]-index-col-wr

Reviewed-by: Eric Anholt <[email protected]>

1 files changed, 12 insertions, 0 deletions

diff --git a/src/mesa/program/ir_to_mesa.cpp b/src/mesa/program/ir_to_mesa.cpp
index d8e5a3a9772..beb481b3a3b 100644
--- a/src/mesa/program/ir_to_mesa.cpp
+++ b/src/mesa/program/ir_to_mesa.cpp
@@ -1496,6 +1496,18 @@ ir_to_mesa_visitor::visit(ir_dereference_array *ir)
 	      this->result, 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)  {
+	 src_reg accum_reg = get_temp(glsl_type::float_type);
+
+	 emit(ir, OPCODE_ADD, dst_reg(accum_reg),
+	      index_reg, *src.reladdr);
+
+	 index_reg = accum_reg;
+      }
+
       src.reladdr = ralloc(mem_ctx, src_reg);
       memcpy(src.reladdr, &index_reg, sizeof(index_reg));
    }