From 3d5c2f0adbd72a68d4fe3900b0d3e267510950ef Mon Sep 17 00:00:00 2001 From: Kenneth Graunke Date: Wed, 21 Jul 2010 21:46:16 -0700 Subject: [PATCH] ir_constant_expression: Add support for the "faceforward" builtin. --- src/glsl/ir_constant_expression.cpp | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/src/glsl/ir_constant_expression.cpp b/src/glsl/ir_constant_expression.cpp index 580ef1d4fae..c939690129a 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) { -- 2.30.2