From 979072613139870f12e329e4b483c7f688b40560 Mon Sep 17 00:00:00 2001
From: Eric Anholt <eric@anholt.net>
Date: Fri, 5 Aug 2011 20:46:03 -0700
Subject: [PATCH] i965/vs: Handle assignment of structures/arrays/matrices
 better.

This gets the right types on the instructions, as well as emitting
minimal swizzles/writemasks.
---
 src/mesa/drivers/dri/i965/brw_vec4.h          |  3 +-
 .../drivers/dri/i965/brw_vec4_visitor.cpp     | 69 +++++++++++++------
 2 files changed, 51 insertions(+), 21 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/brw_vec4.h b/src/mesa/drivers/dri/i965/brw_vec4.h
index 01058243f04..1619c2e1ef6 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4.h
+++ b/src/mesa/drivers/dri/i965/brw_vec4.h
@@ -390,7 +390,8 @@ public:
    void emit_bool_comparison(unsigned int op, dst_reg dst, src_reg src0, src_reg src1);
    void emit_if_gen6(ir_if *ir);
 
-   void emit_block_move(ir_assignment *ir);
+   void emit_block_move(dst_reg *dst, src_reg *src,
+			const struct glsl_type *type, bool predicated);
 
    /**
     * Emit the correct dot-product instruction for the type of arguments
diff --git a/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp b/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
index 27620c47085..4f7763d61bb 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
+++ b/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
@@ -1269,38 +1269,69 @@ get_assignment_lhs(ir_dereference *ir, vec4_visitor *v)
 }
 
 void
-vec4_visitor::emit_block_move(ir_assignment *ir)
+vec4_visitor::emit_block_move(dst_reg *dst, src_reg *src,
+			      const struct glsl_type *type, bool predicated)
 {
-   ir->rhs->accept(this);
-   src_reg src = this->result;
-
-   dst_reg dst = get_assignment_lhs(ir->lhs, this);
+   if (type->base_type == GLSL_TYPE_STRUCT) {
+      for (unsigned int i = 0; i < type->length; i++) {
+	 emit_block_move(dst, src, type->fields.structure[i].type, predicated);
+      }
+      return;
+   }
 
-   if (ir->condition) {
-      emit_bool_to_cond_code(ir->condition);
+   if (type->is_array()) {
+      for (unsigned int i = 0; i < type->length; i++) {
+	 emit_block_move(dst, src, type->fields.array, predicated);
+      }
+      return;
    }
 
-   /* FINISHME: This should really set to the correct maximal writemask for each
-    * FINISHME: component written (in the loops below).
-    */
-   dst.writemask = WRITEMASK_XYZW;
+   if (type->is_matrix()) {
+      const struct glsl_type *vec_type;
 
-   for (int i = 0; i < type_size(ir->lhs->type); i++) {
-      vec4_instruction *inst = emit(BRW_OPCODE_MOV, dst, src);
-      if (ir->condition)
-	 inst->predicate = BRW_PREDICATE_NORMAL;
+      vec_type = glsl_type::get_instance(GLSL_TYPE_FLOAT,
+					 type->vector_elements, 1);
 
-      dst.reg_offset++;
-      src.reg_offset++;
+      for (int i = 0; i < type->matrix_columns; i++) {
+	 emit_block_move(dst, src, vec_type, predicated);
+      }
+      return;
    }
+
+   assert(type->is_scalar() || type->is_vector());
+
+   dst->type = brw_type_for_base_type(type);
+   src->type = dst->type;
+
+   dst->writemask = (1 << type->vector_elements) - 1;
+
+   /* Do we need to worry about swizzling a swizzle? */
+   assert(src->swizzle = BRW_SWIZZLE_NOOP);
+   src->swizzle = swizzle_for_size(type->vector_elements);
+
+   vec4_instruction *inst = emit(BRW_OPCODE_MOV, *dst, *src);
+   if (predicated)
+      inst->predicate = BRW_PREDICATE_NORMAL;
+
+   dst->reg_offset++;
+   src->reg_offset++;
 }
 
 void
 vec4_visitor::visit(ir_assignment *ir)
 {
+   dst_reg dst = get_assignment_lhs(ir->lhs, this);
+
    if (!ir->lhs->type->is_scalar() &&
        !ir->lhs->type->is_vector()) {
-      emit_block_move(ir);
+      ir->rhs->accept(this);
+      src_reg src = this->result;
+
+      if (ir->condition) {
+	 emit_bool_to_cond_code(ir->condition);
+      }
+
+      emit_block_move(&dst, &src, ir->rhs->type, ir->condition != NULL);
       return;
    }
 
@@ -1310,8 +1341,6 @@ vec4_visitor::visit(ir_assignment *ir)
    ir->rhs->accept(this);
    src_reg src = this->result;
 
-   dst_reg dst = get_assignment_lhs(ir->lhs, this);
-
    int swizzles[4];
    int first_enabled_chan = 0;
    int src_chan = 0;
-- 
2.30.2