ir_constant_expression: Add support for the "transpose" builtin.
diff --git a/src/glsl/ir_constant_expression.cpp b/src/glsl/ir_constant_expression.cpp
index b6cb2d8..c4e6d83 100644
--- a/src/glsl/ir_constant_expression.cpp
+++ b/src/glsl/ir_constant_expression.cpp
@@ -1096,7 +1096,14 @@
for (unsigned c = 0; c < op[0]->type->components(); c++)
data.f[c] = tanhf(op[0]->value.f[c]);
} else if (strcmp(callee, "transpose") == 0) {
- return NULL; /* FINISHME: implement this */
+ assert(op[0]->type->is_matrix());
+ const unsigned n = op[0]->type->vector_elements;
+ const unsigned m = op[0]->type->matrix_columns;
+ for (unsigned j = 0; j < m; j++) {
+ for (unsigned i = 0; i < n; i++) {
+ data.f[m*i+j] += op[0]->value.f[i+n*j];
+ }
+ }
} else {
/* Unsupported builtin - some are not allowed in constant expressions. */
return NULL;