summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
-rw-r--r--src/mesa/shader/ir_to_mesa.cpp61
1 files changed, 27 insertions, 34 deletions
diff --git a/src/mesa/shader/ir_to_mesa.cpp b/src/mesa/shader/ir_to_mesa.cpp
index 557f5d319d..848fb0fb6c 100644
--- a/src/mesa/shader/ir_to_mesa.cpp
+++ b/src/mesa/shader/ir_to_mesa.cpp
@@ -1263,7 +1263,8 @@ ir_to_mesa_visitor::visit(ir_dereference_record *ir)
* those, then go use ir_dereference to handle the rest.
*/
static struct ir_to_mesa_dst_reg
-get_assignment_lhs(ir_instruction *ir, ir_to_mesa_visitor *v)
+get_assignment_lhs(ir_instruction *ir, ir_to_mesa_visitor *v,
+ ir_to_mesa_src_reg *r)
{
struct ir_to_mesa_dst_reg dst_reg;
ir_swizzle *swiz;
@@ -1281,41 +1282,35 @@ get_assignment_lhs(ir_instruction *ir, ir_to_mesa_visitor *v)
dst_reg = ir_to_mesa_dst_reg_from_src(v->result);
if ((swiz = ir->as_swizzle())) {
- dst_reg.writemask = 0;
- if (swiz->mask.num_components >= 1)
- dst_reg.writemask |= (1 << swiz->mask.x);
- if (swiz->mask.num_components >= 2)
- dst_reg.writemask |= (1 << swiz->mask.y);
- if (swiz->mask.num_components >= 3)
- dst_reg.writemask |= (1 << swiz->mask.z);
- if (swiz->mask.num_components >= 4)
- dst_reg.writemask |= (1 << swiz->mask.w);
- }
-
- return dst_reg;
-}
+ int swizzles[4] = {
+ swiz->mask.x,
+ swiz->mask.y,
+ swiz->mask.z,
+ swiz->mask.w
+ };
+ int new_r_swizzle[4];
+ int orig_r_swizzle = r->swizzle;
+ int i;
-static GLuint
-reswizzle_for_writemask(GLuint writemask, GLuint swizzle)
-{
- int new_swizzle[4], pos = 0;
- int i;
+ for (i = 0; i < 4; i++) {
+ new_r_swizzle[i] = GET_SWZ(orig_r_swizzle, 0);
+ }
- /* reswizzle the rhs so the components are in place for the
- * components we'll assign to the lhs.
- */
- for (i = 0; i < 4; i++) {
- if (writemask & (1 << i)) {
- new_swizzle[i] = GET_SWZ(swizzle, pos++);
- } else {
- new_swizzle[i] = GET_SWZ(swizzle, 0);
+ dst_reg.writemask = 0;
+ for (i = 0; i < 4; i++) {
+ if (i < swiz->mask.num_components) {
+ dst_reg.writemask |= 1 << swizzles[i];
+ new_r_swizzle[swizzles[i]] = GET_SWZ(orig_r_swizzle, i);
+ }
}
+
+ r->swizzle = MAKE_SWIZZLE4(new_r_swizzle[0],
+ new_r_swizzle[1],
+ new_r_swizzle[2],
+ new_r_swizzle[3]);
}
- return MAKE_SWIZZLE4(new_swizzle[0],
- new_swizzle[1],
- new_swizzle[2],
- new_swizzle[3]);
+ return dst_reg;
}
void
@@ -1328,12 +1323,10 @@ ir_to_mesa_visitor::visit(ir_assignment *ir)
assert(!ir->lhs->type->is_array());
assert(ir->lhs->type->base_type != GLSL_TYPE_STRUCT);
- l = get_assignment_lhs(ir->lhs, this);
-
ir->rhs->accept(this);
r = this->result;
- r.swizzle = reswizzle_for_writemask(l.writemask, r.swizzle);
+ l = get_assignment_lhs(ir->lhs, this, &r);
assert(l.file != PROGRAM_UNDEFINED);
assert(r.file != PROGRAM_UNDEFINED);