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ir_constant_visitor: Add support for dFdx and dFdy operations.

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If the argument is a constant expression...it's not changing per pixel,
so the result is simply 0.
This commit is contained in:
Kenneth Graunke
2010-06-09 15:22:35 -07:00
parent b843c7a20c
commit d6a32d4b54
1 changed files with 9 additions and 0 deletions
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ir_constant_expression.cpp
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@@ -266,6 +266,15 @@ ir_constant_visitor::visit(ir_expression *ir)
}
break;
case ir_unop_dFdx:
case ir_unop_dFdy:
assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);
type = ir->type;
for (c = 0; c < ir->operands[0]->type->components(); c++) {
f[c] = 0.0;
}
break;
case ir_binop_add:
if (ir->operands[0]->type == ir->operands[1]->type) {
type = ir->operands[0]->type;