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authorBrian <[email protected]>2007-01-16 10:45:34 -0700
committerBrian <[email protected]>2007-01-16 10:45:34 -0700
commit156e583a350670cb877879673b8d050b11f973dc (patch)
treeb251ccd86214213df70b1b96eace935ed87f9f8d /src/mesa
parent0d553461563e007826cb89b7897d63f42da0c14e (diff)
fix _slang_gen_subscript() for the case when a simple vector is accessed as an array: convert index to a swizzle/writemask
Diffstat (limited to 'src/mesa')
-rw-r--r--src/mesa/shader/slang/slang_codegen.c69
1 files changed, 52 insertions, 17 deletions
diff --git a/src/mesa/shader/slang/slang_codegen.c b/src/mesa/shader/slang/slang_codegen.c
index 7872d0ce8ff..bd49a265b22 100644
--- a/src/mesa/shader/slang/slang_codegen.c
+++ b/src/mesa/shader/slang/slang_codegen.c
@@ -1760,23 +1760,58 @@ _slang_gen_field(slang_assemble_ctx * A, slang_operation *oper)
static slang_ir_node *
_slang_gen_subscript(slang_assemble_ctx * A, slang_operation *oper)
{
- slang_assembly_typeinfo elem_ti;
- slang_ir_node *elem, *array, *index;
- GLint elemSize;
-
- /* size of array element */
- slang_assembly_typeinfo_construct(&elem_ti);
- _slang_typeof_operation(A, oper, &elem_ti);
- elemSize = _slang_sizeof_type_specifier(&elem_ti.spec);
- assert(elemSize >= 1);
-
- array = _slang_gen_operation(A, &oper->children[0]);
- index = _slang_gen_operation(A, &oper->children[1]);
- elem = new_node(IR_ELEMENT, array, index);
- elem->Store = _slang_new_ir_storage(array->Store->File,
- array->Store->Index,
- elemSize);
- return elem;
+ slang_assembly_typeinfo array_ti;
+
+ /* get array's type info */
+ slang_assembly_typeinfo_construct(&array_ti);
+ _slang_typeof_operation(A, &oper->children[0], &array_ti);
+
+ if (_slang_type_is_vector(array_ti.spec.type)) {
+ /* indexing a simple vector type: "vec4 v; v[0]=p;" */
+ /* translate the index into a swizzle/writemask: "v.x=p" */
+ const GLuint max = _slang_type_dim(array_ti.spec.type);
+ GLint index;
+ slang_ir_node *n;
+
+ index = (GLint) oper->children[1].literal[0];
+ if (oper->children[1].type != slang_oper_literal_int ||
+ index >= max) {
+ RETURN_ERROR("Invalid array index", 0);
+ }
+
+ n = _slang_gen_operation(A, &oper->children[0]);
+ if (n) {
+ /* use swizzle to access the element */
+ n->Swizzle = SWIZZLE_X + index;
+ n->Writemask = WRITEMASK_X << index;
+ }
+ return n;
+ }
+ else {
+ /* conventional array */
+ slang_assembly_typeinfo elem_ti;
+ slang_ir_node *elem, *array, *index;
+ GLint elemSize;
+
+ /* size of array element */
+ slang_assembly_typeinfo_construct(&elem_ti);
+ _slang_typeof_operation(A, oper, &elem_ti);
+ elemSize = _slang_sizeof_type_specifier(&elem_ti.spec);
+ assert(elemSize >= 1);
+
+ array = _slang_gen_operation(A, &oper->children[0]);
+ index = _slang_gen_operation(A, &oper->children[1]);
+ if (array && index) {
+ elem = new_node(IR_ELEMENT, array, index);
+ elem->Store = _slang_new_ir_storage(array->Store->File,
+ array->Store->Index,
+ elemSize);
+ return elem;
+ }
+ else {
+ return NULL;
+ }
+ }
}