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authorIan Romanick <[email protected]>2010-08-02 18:48:25 -0700
committerIan Romanick <[email protected]>2010-08-04 16:47:27 -0700
commit5a7758efbe14dee026245a4f4f4fb3ccf7b2c23b (patch)
treebe214c6f3ea4be5ec4472afa5b3426d5191380f5 /src/glsl/ir_print_visitor.cpp
parent8e9ce2eb56a087c2544112700ae1abe3f96648dd (diff)
glsl2: Add ir_assignment::write_mask and associated methods
Replace swizzles on the LHS with additional swizzles on the RHS and a write mask in the assignment instruction. As part of this add ir_assignment::set_lhs. Ideally we'd make ir_assignment::lhs private to prevent erroneous writes, but that would require a lot of code butchery at this point. Add ir_assignment constructor that takes an explicit write mask. This is required for ir_assignment::clone, but it can also be used in other places. Without this, ir_assignment clones lose their write masks, and incorrect IR is generated in optimization passes. Add ir_assignment::whole_variable_written method. This method gets the variable on the LHS if the whole variable is written or NULL otherwise. This is different from ir->lhs->whole_variable_referenced() because the latter has no knowledge of the write mask stored in the ir_assignment. Gut all code from ir_to_mesa that handled swizzles on the LHS of assignments. There is probably some other refactoring that could be done here, but that can be left for another day.
Diffstat (limited to 'src/glsl/ir_print_visitor.cpp')
-rw-r--r--src/glsl/ir_print_visitor.cpp14
1 files changed, 13 insertions, 1 deletions
diff --git a/src/glsl/ir_print_visitor.cpp b/src/glsl/ir_print_visitor.cpp
index 73476e7e9b6..39b11bb32cc 100644
--- a/src/glsl/ir_print_visitor.cpp
+++ b/src/glsl/ir_print_visitor.cpp
@@ -296,7 +296,19 @@ void ir_print_visitor::visit(ir_assignment *ir)
else
printf("(constant bool (1))");
- printf(" ");
+
+ char mask[5];
+ unsigned j = 0;
+
+ for (unsigned i = 0; i < 4; i++) {
+ if ((ir->write_mask & (1 << i)) != 0) {
+ mask[j] = "xyzw"[i];
+ j++;
+ }
+ }
+ mask[j] = '\0';
+
+ printf(" (%s) ", mask);
ir->lhs->accept(this);