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ir_constant_expression: Add support for the "faceforward" builtin.

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This commit is contained in:
Kenneth Graunke
2010-07-21 21:46:16 -07:00
parent 04b3643dbf
commit 3d5c2f0adb
1 changed files with 4 additions and 1 deletions
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5
src/glsl/ir_constant_expression.cpp
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@@ -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) {