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authorBrian Paul <brianp@vmware.com>2009-01-05 13:12:12 -0700
committerBrian Paul <brianp@vmware.com>2009-01-05 13:16:09 -0700
commit9736d8f03364068c9ca786f88a4c2881d98d5768 (patch)
tree38d819086ba8988362f41773b2d1f0537027b07a /src
parent0d797365deb579cfeb2a32f21692515eb6904921 (diff)
mesa: fix a GLSL swizzled writemask bug
This fixes cases such as: vec4 v4; vec2 v2; v4.xz.yx = v2; The last line now correctly compiles into MOV TEMP[1].xz, TEMP[0].yyxw; Helps to fix the Humus Domino demo. See bug 19189.
Diffstat (limited to 'src')
-rw-r--r--src/mesa/shader/slang/slang_codegen.c20
1 files changed, 18 insertions, 2 deletions
diff --git a/src/mesa/shader/slang/slang_codegen.c b/src/mesa/shader/slang/slang_codegen.c
index 4976daf533b..8e28be8abd1 100644
--- a/src/mesa/shader/slang/slang_codegen.c
+++ b/src/mesa/shader/slang/slang_codegen.c
@@ -3323,6 +3323,22 @@ is_store_writable(const slang_assemble_ctx *A, const slang_ir_storage *store)
/**
+ * Walk up an IR storage path to compute the final swizzle.
+ * This is used when we find an expression such as "foo.xz.yx".
+ */
+static GLuint
+root_swizzle(const slang_ir_storage *st)
+{
+ GLuint swizzle = st->Swizzle;
+ while (st->Parent) {
+ st = st->Parent;
+ swizzle = _slang_swizzle_swizzle(st->Swizzle, swizzle);
+ }
+ return swizzle;
+}
+
+
+/**
* Generate IR tree for an assignment (=).
*/
static slang_ir_node *
@@ -3397,9 +3413,9 @@ _slang_gen_assignment(slang_assemble_ctx * A, slang_operation *oper)
rhs = _slang_gen_operation(A, &oper->children[1]);
if (lhs && rhs) {
/* convert lhs swizzle into writemask */
+ const GLuint swizzle = root_swizzle(lhs->Store);
GLuint writemask, newSwizzle;
- if (!swizzle_to_writemask(A, lhs->Store->Swizzle,
- &writemask, &newSwizzle)) {
+ if (!swizzle_to_writemask(A, swizzle, &writemask, &newSwizzle)) {
/* Non-simple writemask, need to swizzle right hand side in
* order to put components into the right place.
*/