Mesa (glsl2): ir_to_mesa: Add support for adding/subtracting matrices.

[Eric Anholt]

Module: Mesa
Branch: glsl2
Commit: b4d0c0e0ee983ee614b047799c3e01221a353c98
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=b4d0c0e0ee983ee614b047799c3e01221a353c98

Author: Eric Anholt <eric at anholt.net>
Date:   Wed Jul  7 17:08:58 2010 -0700

ir_to_mesa: Add support for adding/subtracting matrices.

This isn't really tested, but didn't break normal vector add/sub.

---

 src/mesa/shader/ir_to_mesa.cpp |   42 +++++++++++++++++++++++++++++++++++++--
 1 files changed, 39 insertions(+), 3 deletions(-)

diff --git a/src/mesa/shader/ir_to_mesa.cpp b/src/mesa/shader/ir_to_mesa.cpp
index e1c0fca..b42ac84 100644
--- a/src/mesa/shader/ir_to_mesa.cpp
+++ b/src/mesa/shader/ir_to_mesa.cpp
@@ -178,6 +178,13 @@ public:
 				   ir_to_mesa_src_reg src0,
 				   ir_to_mesa_src_reg src1);
 
+   void ir_to_mesa_emit_addsub(ir_expression *ir,
+			       enum prog_opcode opcode,
+			       struct ir_to_mesa_src_reg result_src,
+			       struct ir_to_mesa_dst_reg result_dst,
+			       struct ir_to_mesa_src_reg op0,
+			       struct ir_to_mesa_src_reg op1);
+
    int *sampler_map;
    int sampler_map_size;
 
@@ -531,6 +538,32 @@ ir_to_mesa_visitor::visit(ir_function *ir)
 }
 
 void
+ir_to_mesa_visitor::ir_to_mesa_emit_addsub(ir_expression *ir,
+					   enum prog_opcode opcode,
+					   struct ir_to_mesa_src_reg result_src,
+					   struct ir_to_mesa_dst_reg result_dst,
+					   struct ir_to_mesa_src_reg op0,
+					   struct ir_to_mesa_src_reg op1)
+{
+   ir_to_mesa_dst_reg dst_column = result_dst;
+   int matrix_columns;
+
+   if (ir->operands[0]->type->is_matrix())
+      matrix_columns = ir->operands[0]->type->matrix_columns;
+   else
+      matrix_columns = ir->operands[1]->type->matrix_columns;
+
+   for (int i = 0; i < matrix_columns; i++) {
+      ir_to_mesa_emit_op2(ir, opcode, dst_column, op0, op1);
+      dst_column.index++;
+      if (ir->operands[0]->type->is_matrix())
+	 op0.index++;
+      if (ir->operands[1]->type->is_matrix())
+	 op1.index++;
+   }
+}
+
+void
 ir_to_mesa_visitor::visit(ir_expression *ir)
 {
    unsigned int operand;
@@ -554,7 +587,8 @@ ir_to_mesa_visitor::visit(ir_expression *ir)
 
       /* Only expression implemented for matrices yet */
       assert(!ir->operands[operand]->type->is_matrix() ||
-	     ir->operation == ir_binop_mul);
+	     ir->operation == ir_binop_mul ||
+	     ir->operation == ir_binop_add);
    }
 
    this->result.file = PROGRAM_UNDEFINED;
@@ -618,10 +652,12 @@ ir_to_mesa_visitor::visit(ir_expression *ir)
       break;
 
    case ir_binop_add:
-      ir_to_mesa_emit_op2(ir, OPCODE_ADD, result_dst, op[0], op[1]);
+      ir_to_mesa_emit_addsub(ir, OPCODE_ADD,
+			     result_src, result_dst, op[0], op[1]);
       break;
    case ir_binop_sub:
-      ir_to_mesa_emit_op2(ir, OPCODE_SUB, result_dst, op[0], op[1]);
+      ir_to_mesa_emit_addsub(ir, OPCODE_SUB,
+			     result_src, result_dst, op[0], op[1]);
       break;
 
    case ir_binop_mul: