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/*
* Copyright © 2010 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
/**
* \file ir_constant_expression.cpp
* Evaluate and process constant valued expressions
*
* In GLSL, constant valued expressions are used in several places. These
* must be processed and evaluated very early in the compilation process.
*
* * Sizes of arrays
* * Initializers for uniforms
* * Initializers for \c const variables
*/
#define NULL 0
#include "ir.h"
#include "ir_visitor.h"
#include "glsl_types.h"
/**
* Visitor class for evaluating constant expressions
*/
class ir_constant_visitor : public ir_visitor {
public:
ir_constant_visitor()
: value(NULL)
{
/* empty */
}
virtual ~ir_constant_visitor()
{
/* empty */
}
/**
* \name Visit methods
*
* As typical for the visitor pattern, there must be one \c visit method for
* each concrete subclass of \c ir_instruction. Virtual base classes within
* the hierarchy should not have \c visit methods.
*/
/*@{*/
virtual void visit(ir_variable *);
virtual void visit(ir_function_signature *);
virtual void visit(ir_function *);
virtual void visit(ir_expression *);
virtual void visit(ir_swizzle *);
virtual void visit(ir_dereference *);
virtual void visit(ir_assignment *);
virtual void visit(ir_constant *);
virtual void visit(ir_call *);
virtual void visit(ir_return *);
virtual void visit(ir_if *);
virtual void visit(ir_loop *);
virtual void visit(ir_loop_jump *);
/*@}*/
/**
* Value of the constant expression.
*
* \note
* This field will be \c NULL if the expression is not constant valued.
*/
/* FINIHSME: This cannot hold values for constant arrays or structures. */
ir_constant *value;
};
ir_constant *
ir_instruction::constant_expression_value()
{
ir_constant_visitor visitor;
this->accept(& visitor);
return visitor.value;
}
void
ir_constant_visitor::visit(ir_variable *ir)
{
(void) ir;
value = NULL;
}
void
ir_constant_visitor::visit(ir_function_signature *ir)
{
(void) ir;
value = NULL;
}
void
ir_constant_visitor::visit(ir_function *ir)
{
(void) ir;
value = NULL;
}
void
ir_constant_visitor::visit(ir_expression *ir)
{
value = NULL;
ir_constant *op[2];
unsigned int operand, c;
unsigned u[16];
int i[16];
float f[16];
bool b[16];
const glsl_type *type = NULL;
for (operand = 0; operand < ir->get_num_operands(); operand++) {
op[operand] = ir->operands[operand]->constant_expression_value();
if (!op[operand])
return;
}
switch (ir->operation) {
case ir_unop_logic_not:
type = ir->operands[0]->type;
assert(type->base_type == GLSL_TYPE_BOOL);
for (c = 0; c < ir->operands[0]->type->components(); c++)
b[c] = !op[0]->value.b[c];
break;
case ir_unop_f2i:
assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);
type = ir->type;
for (c = 0; c < ir->operands[0]->type->components(); c++) {
i[c] = op[0]->value.f[c];
}
break;
case ir_unop_i2f:
assert(op[0]->type->base_type == GLSL_TYPE_UINT ||
op[0]->type->base_type == GLSL_TYPE_INT);
type = ir->type;
for (c = 0; c < ir->operands[0]->type->components(); c++) {
if (op[0]->type->base_type == GLSL_TYPE_INT)
f[c] = op[0]->value.i[c];
else
f[c] = op[0]->value.u[c];
}
break;
case ir_binop_add:
if (ir->operands[0]->type == ir->operands[1]->type) {
type = ir->operands[0]->type;
for (c = 0; c < ir->operands[0]->type->components(); c++) {
switch (ir->operands[0]->type->base_type) {
case GLSL_TYPE_UINT:
u[c] = op[0]->value.u[c] + op[1]->value.u[c];
break;
case GLSL_TYPE_INT:
i[c] = op[0]->value.i[c] + op[1]->value.i[c];
break;
case GLSL_TYPE_FLOAT:
f[c] = op[0]->value.f[c] + op[1]->value.f[c];
break;
default:
assert(0);
}
}
}
break;
case ir_binop_sub:
if (ir->operands[0]->type == ir->operands[1]->type) {
type = ir->operands[0]->type;
for (c = 0; c < ir->operands[0]->type->components(); c++) {
switch (ir->operands[0]->type->base_type) {
case GLSL_TYPE_UINT:
u[c] = op[0]->value.u[c] - op[1]->value.u[c];
break;
case GLSL_TYPE_INT:
i[c] = op[0]->value.i[c] - op[1]->value.i[c];
break;
case GLSL_TYPE_FLOAT:
f[c] = op[0]->value.f[c] - op[1]->value.f[c];
break;
default:
assert(0);
}
}
}
break;
case ir_binop_mul:
if (ir->operands[0]->type == ir->operands[1]->type &&
!ir->operands[0]->type->is_matrix()) {
type = ir->operands[0]->type;
for (c = 0; c < ir->operands[0]->type->components(); c++) {
switch (ir->operands[0]->type->base_type) {
case GLSL_TYPE_UINT:
u[c] = op[0]->value.u[c] * op[1]->value.u[c];
break;
case GLSL_TYPE_INT:
i[c] = op[0]->value.i[c] * op[1]->value.i[c];
break;
case GLSL_TYPE_FLOAT:
f[c] = op[0]->value.f[c] * op[1]->value.f[c];
break;
default:
assert(0);
}
}
}
break;
case ir_binop_div:
if (ir->operands[0]->type == ir->operands[1]->type) {
type = ir->operands[0]->type;
for (c = 0; c < ir->operands[0]->type->components(); c++) {
switch (ir->operands[0]->type->base_type) {
case GLSL_TYPE_UINT:
u[c] = op[0]->value.u[c] / op[1]->value.u[c];
break;
case GLSL_TYPE_INT:
i[c] = op[0]->value.i[c] / op[1]->value.i[c];
break;
case GLSL_TYPE_FLOAT:
f[c] = op[0]->value.f[c] / op[1]->value.f[c];
break;
default:
assert(0);
}
}
}
break;
case ir_binop_logic_and:
type = ir->operands[0]->type;
assert(type->base_type == GLSL_TYPE_BOOL);
for (c = 0; c < ir->operands[0]->type->components(); c++)
b[c] = op[0]->value.b[c] && op[1]->value.b[c];
break;
case ir_binop_logic_xor:
type = ir->operands[0]->type;
assert(type->base_type == GLSL_TYPE_BOOL);
for (c = 0; c < ir->operands[0]->type->components(); c++)
b[c] = op[0]->value.b[c] ^ op[1]->value.b[c];
break;
case ir_binop_logic_or:
type = ir->operands[0]->type;
assert(type->base_type == GLSL_TYPE_BOOL);
for (c = 0; c < ir->operands[0]->type->components(); c++)
b[c] = op[0]->value.b[c] || op[1]->value.b[c];
break;
case ir_binop_less:
type = glsl_type::bool_type;
switch (ir->operands[0]->type->base_type) {
case GLSL_TYPE_UINT:
b[0] = op[0]->value.u[0] < op[1]->value.u[0];
break;
case GLSL_TYPE_INT:
b[0] = op[0]->value.i[0] < op[1]->value.i[0];
break;
case GLSL_TYPE_FLOAT:
b[0] = op[0]->value.f[0] < op[1]->value.f[0];
break;
default:
assert(0);
}
break;
case ir_binop_greater:
type = glsl_type::bool_type;
switch (ir->operands[0]->type->base_type) {
case GLSL_TYPE_UINT:
b[0] = op[0]->value.u[0] > op[1]->value.u[0];
break;
case GLSL_TYPE_INT:
b[0] = op[0]->value.i[0] > op[1]->value.i[0];
break;
case GLSL_TYPE_FLOAT:
b[0] = op[0]->value.f[0] > op[1]->value.f[0];
break;
default:
assert(0);
}
break;
case ir_binop_lequal:
type = glsl_type::bool_type;
switch (ir->operands[0]->type->base_type) {
case GLSL_TYPE_UINT:
b[0] = op[0]->value.u[0] <= op[1]->value.u[0];
break;
case GLSL_TYPE_INT:
b[0] = op[0]->value.i[0] <= op[1]->value.i[0];
break;
case GLSL_TYPE_FLOAT:
b[0] = op[0]->value.f[0] <= op[1]->value.f[0];
break;
default:
assert(0);
}
break;
case ir_binop_gequal:
type = glsl_type::bool_type;
switch (ir->operands[0]->type->base_type) {
case GLSL_TYPE_UINT:
b[0] = op[0]->value.u[0] >= op[1]->value.u[0];
break;
case GLSL_TYPE_INT:
b[0] = op[0]->value.i[0] >= op[1]->value.i[0];
break;
case GLSL_TYPE_FLOAT:
b[0] = op[0]->value.f[0] >= op[1]->value.f[0];
break;
default:
assert(0);
}
break;
case ir_binop_equal:
if (ir->operands[0]->type == ir->operands[1]->type) {
type = glsl_type::bool_type;
b[0] = true;
for (c = 0; c < ir->operands[0]->type->components(); c++) {
switch (ir->operands[0]->type->base_type) {
case GLSL_TYPE_UINT:
b[0] = b[0] && op[0]->value.u[c] == op[1]->value.u[c];
break;
case GLSL_TYPE_INT:
b[0] = b[0] && op[0]->value.i[c] == op[1]->value.i[c];
break;
case GLSL_TYPE_FLOAT:
b[0] = b[0] && op[0]->value.f[c] == op[1]->value.f[c];
break;
case GLSL_TYPE_BOOL:
b[0] = b[0] && op[0]->value.b[c] == op[1]->value.b[c];
break;
default:
assert(0);
}
}
}
break;
case ir_binop_nequal:
if (ir->operands[0]->type == ir->operands[1]->type) {
type = glsl_type::bool_type;
b[0] = false;
for (c = 0; c < ir->operands[0]->type->components(); c++) {
switch (ir->operands[0]->type->base_type) {
case GLSL_TYPE_UINT:
b[0] = b[0] || op[0]->value.u[c] != op[1]->value.u[c];
break;
case GLSL_TYPE_INT:
b[0] = b[0] || op[0]->value.i[c] != op[1]->value.i[c];
break;
case GLSL_TYPE_FLOAT:
b[0] = b[0] || op[0]->value.f[c] != op[1]->value.f[c];
break;
case GLSL_TYPE_BOOL:
b[0] = b[0] || op[0]->value.b[c] != op[1]->value.b[c];
break;
default:
assert(0);
}
}
}
break;
default:
break;
}
if (type) {
switch (type->base_type) {
case GLSL_TYPE_UINT:
value = new ir_constant(type, u);
break;
case GLSL_TYPE_INT:
value = new ir_constant(type, i);
break;
case GLSL_TYPE_FLOAT:
value = new ir_constant(type, f);
break;
case GLSL_TYPE_BOOL:
value = new ir_constant(type, b);
break;
}
}
}
void
ir_constant_visitor::visit(ir_swizzle *ir)
{
(void) ir;
value = NULL;
}
void
ir_constant_visitor::visit(ir_dereference *ir)
{
value = NULL;
if (ir->mode == ir_dereference::ir_reference_variable) {
ir_variable *var = ir->var->as_variable();
if (var && var->constant_value) {
value = new ir_constant(ir->type, &var->constant_value->value);
}
}
/* FINISHME: Other dereference modes. */
}
void
ir_constant_visitor::visit(ir_assignment *ir)
{
(void) ir;
value = NULL;
}
void
ir_constant_visitor::visit(ir_constant *ir)
{
value = ir;
}
void
ir_constant_visitor::visit(ir_call *ir)
{
(void) ir;
value = NULL;
}
void
ir_constant_visitor::visit(ir_return *ir)
{
(void) ir;
value = NULL;
}
void
ir_constant_visitor::visit(ir_if *ir)
{
(void) ir;
value = NULL;
}
void
ir_constant_visitor::visit(ir_loop *ir)
{
(void) ir;
value = NULL;
}
void
ir_constant_visitor::visit(ir_loop_jump *ir)
{
(void) ir;
value = NULL;
}
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