Mesa (glsl2): ir_to_mesa: Fix matrix * scalar multiplication.

[Eric Anholt]

Module: Mesa
Branch: glsl2
Commit: 3f3f41357d33893d01213b37c6d92bcb435b0eeb
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=3f3f41357d33893d01213b37c6d92bcb435b0eeb

Author: Eric Anholt <eric at anholt.net>
Date:   Mon Jun 28 19:56:53 2010 -0700

ir_to_mesa: Fix matrix * scalar multiplication.

We're accessing in terms of columns, so we need to do MUL/MAD/MAD/MAD
instead of DP4s.

Fixes:
glsl-fs-exp2
glsl-fs-log2
glsl-fs-mix-constant
glsl-fs-sqrt-zero
glsl-vs-sqrt-zero

---

 src/mesa/shader/ir_to_mesa.cpp |   20 +++++++++++++-------
 1 files changed, 13 insertions(+), 7 deletions(-)

diff --git a/src/mesa/shader/ir_to_mesa.cpp b/src/mesa/shader/ir_to_mesa.cpp
index 8541906..b8113da 100644
--- a/src/mesa/shader/ir_to_mesa.cpp
+++ b/src/mesa/shader/ir_to_mesa.cpp
@@ -589,15 +589,21 @@ ir_to_mesa_visitor::visit(ir_expression *ir)
 	       src_column.index++;
 	    }
 	 } else {
-	    ir_to_mesa_dst_reg dst_chan = result_dst;
 	    ir_to_mesa_src_reg src_column = op[0];
 	    ir_to_mesa_src_reg src_chan = op[1];
-	    for (int i = 0; i < ir->operands[0]->type->matrix_columns; i++) {
-	       dst_chan.writemask = (1 << i);
-	       src_chan.swizzle = MAKE_SWIZZLE4(i, i, i, i);
-	       ir_to_mesa_emit_op2(ir, OPCODE_MUL,
-				   dst_chan, src_column, src_chan);
-	       src_column.index++;
+	    assert(!ir->operands[1]->type->is_matrix() ||
+		    !"FINISHME: matrix * matrix");
+	     for (int i = 0; i < ir->operands[0]->type->matrix_columns; i++) {
+		src_chan.swizzle = MAKE_SWIZZLE4(i, i, i, i);
+		if (i == 0) {
+		   ir_to_mesa_emit_op2(ir, OPCODE_MUL,
+				       result_dst, src_column, src_chan);
+		} else {
+		   ir_to_mesa_emit_op3(ir, OPCODE_MAD,
+				       result_dst, src_column, src_chan,
+				       result_src);
+		}
+		src_column.index++;
 	    }
 	 }
       } else {