Mesa (master): glsl_to_tgsi: improve assignment hack
Bryan Cain
bryanc at kemper.freedesktop.org
Tue Aug 9 17:35:57 UTC 2011
Module: Mesa
Branch: master
Commit: e6c64800cc8833fb4083a556c839b51e8ac84a8b
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=e6c64800cc8833fb4083a556c839b51e8ac84a8b
Author: Henri Verbeet <hverbeet at gmail.com>
Date: Tue Aug 9 12:23:47 2011 -0500
glsl_to_tgsi: improve assignment hack
Fixes StarCraft 2 and Fallout 3 in Wine.
---
src/mesa/state_tracker/st_glsl_to_tgsi.cpp | 8 +++++---
1 files changed, 5 insertions(+), 3 deletions(-)
diff --git a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
index d7a1ba8..aef23e7 100644
--- a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
+++ b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
@@ -1994,15 +1994,17 @@ glsl_to_tgsi_visitor::visit(ir_assignment *ir)
} else if (ir->rhs->as_expression() &&
this->instructions.get_tail() &&
ir->rhs == ((glsl_to_tgsi_instruction *)this->instructions.get_tail())->ir &&
- type_size(ir->lhs->type) == 1) {
+ type_size(ir->lhs->type) == 1 &&
+ l.writemask == ((glsl_to_tgsi_instruction *)this->instructions.get_tail())->dst.writemask) {
/* To avoid emitting an extra MOV when assigning an expression to a
* variable, emit the last instruction of the expression again, but
* replace the destination register with the target of the assignment.
* Dead code elimination will remove the original instruction.
*/
- glsl_to_tgsi_instruction *inst;
+ glsl_to_tgsi_instruction *inst, *new_inst;
inst = (glsl_to_tgsi_instruction *)this->instructions.get_tail();
- emit(ir, inst->op, l, inst->src[0], inst->src[1], inst->src[2]);
+ new_inst = emit(ir, inst->op, l, inst->src[0], inst->src[1], inst->src[2]);
+ new_inst->saturate = inst->saturate;
} else {
for (i = 0; i < type_size(ir->lhs->type); i++) {
emit(ir, TGSI_OPCODE_MOV, l, r);
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