diff options
| -rw-r--r-- | src/glsl/ir_constant_expression.cpp | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/src/glsl/ir_constant_expression.cpp b/src/glsl/ir_constant_expression.cpp index 580ef1d4fa..c939690129 100644 --- a/src/glsl/ir_constant_expression.cpp +++ b/src/glsl/ir_constant_expression.cpp @@ -881,7 +881,10 @@ ir_call::constant_expression_value() } else if (strcmp(callee, "exp2") == 0) { expr = new(mem_ctx) ir_expression(ir_unop_exp2, type, op[0], NULL); } else if (strcmp(callee, "faceforward") == 0) { - return NULL; /* FINISHME: implement this */ + if (dot(op[2], op[1]) < 0) + return op[0]; + for (unsigned c = 0; c < op[0]->type->components(); c++) + data.f[c] = -op[0]->value.f[c]; } else if (strcmp(callee, "floor") == 0) { expr = new(mem_ctx) ir_expression(ir_unop_floor, type, op[0], NULL); } else if (strcmp(callee, "fract") == 0) { |