ir_constant_expression: Add support for the "mix" builtin.
Both 1.10 and 1.30 variants.
diff --git a/src/glsl/ir_constant_expression.cpp b/src/glsl/ir_constant_expression.cpp
index c4e6d83..9fc37b3 100644
--- a/src/glsl/ir_constant_expression.cpp
+++ b/src/glsl/ir_constant_expression.cpp
@@ -999,7 +999,19 @@
} else if (strcmp(callee, "min") == 0) {
expr = new(mem_ctx) ir_expression(ir_binop_min, type, op[0], op[1]);
} else if (strcmp(callee, "mix") == 0) {
- return NULL; /* FINISHME: implement this */
+ assert(op[0]->type->is_float() && op[1]->type->is_float());
+ if (op[2]->type->is_float()) {
+ unsigned c2_inc = op[2]->type->is_scalar() ? 0 : 1;
+ unsigned components = op[0]->type->components();
+ for (unsigned c = 0, c2 = 0; c < components; c2 += c2_inc, c++) {
+ data.f[c] = op[0]->value.f[c] * (1 - op[2]->value.f[c2]) +
+ op[1]->value.f[c] * op[2]->value.f[c2];
+ }
+ } else {
+ assert(op[2]->type->is_boolean());
+ for (unsigned c = 0; c < op[0]->type->components(); c++)
+ data.f[c] = op[op[2]->value.b[c] ? 1 : 0]->value.f[c];
+ }
} else if (strcmp(callee, "mod") == 0) {
expr = new(mem_ctx) ir_expression(ir_binop_mod, type, op[0], op[1]);
} else if (strcmp(callee, "normalize") == 0) {