ir_constant_expression: Add support for the "lessThan" builtin.
diff --git a/src/glsl/ir_constant_expression.cpp b/src/glsl/ir_constant_expression.cpp
index 4a5eb75..032214e 100644
--- a/src/glsl/ir_constant_expression.cpp
+++ b/src/glsl/ir_constant_expression.cpp
@@ -901,7 +901,22 @@
} else if (strcmp(callee, "length") == 0) {
return NULL; /* FINISHME: implement this */
} else if (strcmp(callee, "lessThan") == 0) {
- return NULL; /* FINISHME: implement this */
+ assert(op[0]->type->is_vector() && op[1] && op[1]->type->is_vector());
+ for (unsigned c = 0; c < op[0]->type->components(); c++) {
+ switch (op[0]->type->base_type) {
+ case GLSL_TYPE_UINT:
+ data.b[c] = op[0]->value.u[c] < op[1]->value.u[c];
+ break;
+ case GLSL_TYPE_INT:
+ data.b[c] = op[0]->value.i[c] < op[1]->value.i[c];
+ break;
+ case GLSL_TYPE_FLOAT:
+ data.b[c] = op[0]->value.f[c] < op[1]->value.f[c];
+ break;
+ default:
+ assert(!"Should not get here.");
+ }
+ }
} else if (strcmp(callee, "lessThanEqual") == 0) {
return NULL; /* FINISHME: implement this */
} else if (strcmp(callee, "log") == 0) {