[Mesa-dev] [PATCH] glsl_to_tgsi: set correct register type for array and structure elements

[Bryan Cain]

This fixes an issue where glsl_to_tgsi_visior::get_opcode() would emit the
wrong opcode because the register type was GLSL_TYPE_ARRAY/STRUCT instead of
GLSL_TYPE_FLOAT/INT/UINT/BOOL, so the function would use the float opcodes for
operations on integer or boolean values dereferenced from an array or
structure.  Assertions have been added to get_opcode() to prevent this bug
from reappearing in the future.
---
 src/mesa/state_tracker/st_glsl_to_tgsi.cpp |   21 +++++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

diff --git a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
index 9146f24..cefc568 100644
--- a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
+++ b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
@@ -633,6 +633,11 @@ glsl_to_tgsi_visitor::get_opcode(ir_instruction *ir, unsigned op,
 {
    int type = GLSL_TYPE_FLOAT;
    
+   assert(src0.type != GLSL_TYPE_ARRAY);
+   assert(src0.type != GLSL_TYPE_STRUCT);
+   assert(src1.type != GLSL_TYPE_ARRAY);
+   assert(src1.type != GLSL_TYPE_STRUCT);
+
    if (src0.type == GLSL_TYPE_FLOAT || src1.type == GLSL_TYPE_FLOAT)
       type = GLSL_TYPE_FLOAT;
    else if (native_integers)
@@ -1074,8 +1079,12 @@ glsl_to_tgsi_visitor::visit(ir_variable *ir)
                assert(index == storage->index + (int)i);
             }
          } else {
-            st_src_reg src(PROGRAM_STATE_VAR, index,
-                  native_integers ? ir->type->base_type : GLSL_TYPE_FLOAT);
+         	/* We use GLSL_TYPE_FLOAT here regardless of the actual type of
+         	 * the data being moved since MOV does not care about the type of
+         	 * data it is moving, and we don't want to declare registers with
+         	 * array or struct types.
+         	 */
+            st_src_reg src(PROGRAM_STATE_VAR, index, GLSL_TYPE_FLOAT);
             src.swizzle = slots[i].swizzle;
             emit(ir, TGSI_OPCODE_MOV, dst, src);
             /* even a float takes up a whole vec4 reg in a struct/array. */
@@ -2042,6 +2051,9 @@ glsl_to_tgsi_visitor::visit(ir_dereference_array *ir)
    else
       src.swizzle = SWIZZLE_NOOP;
 
+   /* Change the register type to the element type of the array. */
+   src.type = ir->type->base_type;
+
    this->result = src;
 }
 
@@ -2067,6 +2079,7 @@ glsl_to_tgsi_visitor::visit(ir_dereference_record *ir)
       this->result.swizzle = SWIZZLE_NOOP;
 
    this->result.index += offset;
+   this->result.type = ir->type->base_type;
 }
 
 /**
@@ -2286,6 +2299,10 @@ glsl_to_tgsi_visitor::visit(ir_assignment *ir)
       inst->dead_mask = inst->dst.writemask;
    } else {
       for (i = 0; i < type_size(ir->lhs->type); i++) {
+         if (ir->rhs->type->is_array())
+         	r.type = ir->rhs->type->element_type()->base_type;
+         else if (ir->rhs->type->is_record())
+         	r.type = ir->rhs->type->fields.structure[i].type->base_type;
          emit(ir, TGSI_OPCODE_MOV, l, r);
          l.index++;
          r.index++;
-- 
1.7.9.5