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Start trying to fill in a few bits of ir_constant_expression.cpp

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This makes a little progress on CorrectParse2.frag.
This commit is contained in:
Eric Anholt
2010-03-31 16:25:12 -10:00
committed by Ian Romanick
parent 307c71bf24
commit a576f9d84c
1 changed files with 33 additions and 2 deletions
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35
ir_constant_expression.cpp
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@@ -36,6 +36,7 @@
#define NULL 0
#include "ir.h"
#include "ir_visitor.h"
#include "glsl_types.h"
/**
* Visitor class for evaluating constant expressions
@@ -127,12 +128,42 @@ ir_constant_visitor::visit(ir_function *ir)
value = NULL;
}
void
ir_constant_visitor::visit(ir_expression *ir)
{
(void) ir;
value = NULL;
ir_constant *op[2];
switch (ir->operation) {
case ir_binop_mul:
op[0] = ir->operands[0]->constant_expression_value();
op[1] = ir->operands[1]->constant_expression_value();
if (op[0] && op[1] && ir->operands[0]->type == ir->operands[1]->type) {
if (ir->operands[1]->type == glsl_type::float_type) {
value = new ir_constant(op[0]->value.f[0] * op[1]->value.f[0]);
value->type = glsl_type::float_type;
}
}
break;
case ir_binop_logic_and:
op[0] = ir->operands[0]->constant_expression_value();
op[1] = ir->operands[1]->constant_expression_value();
if (op[0] && op[1]) {
value = new ir_constant(op[0]->value.b[0] && op[1]->value.b[0]);
value->type = glsl_type::bool_type;
}
break;
case ir_binop_logic_or:
op[0] = ir->operands[0]->constant_expression_value();
op[1] = ir->operands[1]->constant_expression_value();
if (op[0] && op[1]) {
value = new ir_constant(op[0]->value.b[0] || op[1]->value.b[0]);
value->type = glsl_type::bool_type;
}
break;
default:
break;
}
}