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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
*/
#include <math.h>
#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_texture *);
virtual void visit(ir_swizzle *);
virtual void visit(ir_dereference_variable *);
virtual void visit(ir_dereference_array *);
virtual void visit(ir_dereference_record *);
virtual void visit(ir_assignment *);
virtual void visit(ir_constant *);
virtual void visit(ir_call *);
virtual void visit(ir_return *);
virtual void visit(ir_discard *);
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] = { NULL, NULL };
ir_constant_data data;
memset(&data, 0, sizeof(data));
for (unsigned operand = 0; operand < ir->get_num_operands(); operand++) {
op[operand] = ir->operands[operand]->constant_expression_value();
if (!op[operand])
return;
}
if (op[1] != NULL)
assert(op[0]->type->base_type == op[1]->type->base_type);
bool op0_scalar = op[0]->type->is_scalar();
bool op1_scalar = op[1] != NULL && op[1]->type->is_scalar();
/* When iterating over a vector or matrix's components, we want to increase
* the loop counter. However, for scalars, we want to stay at 0.
*/
unsigned c0_inc = op0_scalar ? 0 : 1;
unsigned c1_inc = op1_scalar ? 0 : 1;
unsigned components;
if (op1_scalar || !op[1]) {
components = op[0]->type->components();
} else {
components = op[1]->type->components();
}
switch (ir->operation) {
case ir_unop_logic_not:
assert(op[0]->type->base_type == GLSL_TYPE_BOOL);
for (unsigned c = 0; c < ir->operands[0]->type->components(); c++)
data.b[c] = !op[0]->value.b[c];
break;
case ir_unop_f2i:
assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);
for (unsigned c = 0; c < ir->operands[0]->type->components(); c++) {
data.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);
for (unsigned c = 0; c < ir->operands[0]->type->components(); c++) {
if (op[0]->type->base_type == GLSL_TYPE_INT)
data.f[c] = op[0]->value.i[c];
else
data.f[c] = op[0]->value.u[c];
}
break;
case ir_unop_b2f:
assert(op[0]->type->base_type == GLSL_TYPE_BOOL);
for (unsigned c = 0; c < ir->operands[0]->type->components(); c++) {
data.f[c] = op[0]->value.b[c] ? 1.0 : 0.0;
}
break;
case ir_unop_f2b:
assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);
for (unsigned c = 0; c < ir->operands[0]->type->components(); c++) {
data.b[c] = bool(op[0]->value.f[c]);
}
break;
case ir_unop_b2i:
assert(op[0]->type->base_type == GLSL_TYPE_BOOL);
for (unsigned c = 0; c < ir->operands[0]->type->components(); c++) {
data.u[c] = op[0]->value.b[c] ? 1 : 0;
}
break;
case ir_unop_i2b:
assert(op[0]->type->is_integer());
for (unsigned c = 0; c < ir->operands[0]->type->components(); c++) {
data.b[c] = bool(op[0]->value.u[c]);
}
break;
case ir_unop_trunc:
assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);
for (unsigned c = 0; c < ir->operands[0]->type->components(); c++) {
data.f[c] = truncf(op[0]->value.f[c]);
}
break;
case ir_unop_ceil:
assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);
for (unsigned c = 0; c < ir->operands[0]->type->components(); c++) {
data.f[c] = ceilf(op[0]->value.f[c]);
}
break;
case ir_unop_fract:
for (unsigned c = 0; c < ir->operands[0]->type->components(); c++) {
switch (ir->type->base_type) {
case GLSL_TYPE_UINT:
data.u[c] = 0;
break;
case GLSL_TYPE_INT:
data.i[c] = 0;
break;
case GLSL_TYPE_FLOAT:
data.f[c] = op[0]->value.f[c] - floor(op[0]->value.f[c]);
break;
default:
assert(0);
}
}
break;
case ir_unop_neg:
for (unsigned c = 0; c < ir->operands[0]->type->components(); c++) {
switch (ir->type->base_type) {
case GLSL_TYPE_UINT:
data.u[c] = -op[0]->value.u[c];
break;
case GLSL_TYPE_INT:
data.i[c] = -op[0]->value.i[c];
break;
case GLSL_TYPE_FLOAT:
data.f[c] = -op[0]->value.f[c];
break;
default:
assert(0);
}
}
break;
case ir_unop_abs:
for (unsigned c = 0; c < ir->operands[0]->type->components(); c++) {
switch (ir->type->base_type) {
case GLSL_TYPE_UINT:
data.u[c] = op[0]->value.u[c];
break;
case GLSL_TYPE_INT:
data.i[c] = op[0]->value.i[c];
if (data.i[c] < 0)
data.i[c] = -data.i[c];
break;
case GLSL_TYPE_FLOAT:
data.f[c] = fabs(op[0]->value.f[c]);
break;
default:
assert(0);
}
}
break;
case ir_unop_sign:
for (unsigned c = 0; c < ir->operands[0]->type->components(); c++) {
switch (ir->type->base_type) {
case GLSL_TYPE_UINT:
data.u[c] = op[0]->value.i[c] > 0;
break;
case GLSL_TYPE_INT:
data.i[c] = (op[0]->value.i[c] > 0) - (op[0]->value.i[c] < 0);
break;
case GLSL_TYPE_FLOAT:
data.f[c] = float((op[0]->value.f[c] > 0)-(op[0]->value.f[c] < 0));
break;
default:
assert(0);
}
}
break;
case ir_unop_rcp:
assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);
for (unsigned c = 0; c < ir->operands[0]->type->components(); c++) {
switch (ir->type->base_type) {
case GLSL_TYPE_UINT:
if (op[0]->value.u[c] != 0.0)
data.u[c] = 1 / op[0]->value.u[c];
break;
case GLSL_TYPE_INT:
if (op[0]->value.i[c] != 0.0)
data.i[c] = 1 / op[0]->value.i[c];
break;
case GLSL_TYPE_FLOAT:
if (op[0]->value.f[c] != 0.0)
data.f[c] = 1.0 / op[0]->value.f[c];
break;
default:
assert(0);
}
}
break;
case ir_unop_rsq:
assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);
for (unsigned c = 0; c < ir->operands[0]->type->components(); c++) {
data.f[c] = 1.0 / sqrtf(op[0]->value.f[c]);
}
break;
case ir_unop_sqrt:
assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);
for (unsigned c = 0; c < ir->operands[0]->type->components(); c++) {
data.f[c] = sqrtf(op[0]->value.f[c]);
}
break;
case ir_unop_exp:
assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);
for (unsigned c = 0; c < ir->operands[0]->type->components(); c++) {
data.f[c] = expf(op[0]->value.f[c]);
}
break;
case ir_unop_exp2:
assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);
for (unsigned c = 0; c < ir->operands[0]->type->components(); c++) {
data.f[c] = exp2f(op[0]->value.f[c]);
}
break;
case ir_unop_log:
assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);
for (unsigned c = 0; c < ir->operands[0]->type->components(); c++) {
data.f[c] = logf(op[0]->value.f[c]);
}
break;
case ir_unop_log2:
assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);
for (unsigned c = 0; c < ir->operands[0]->type->components(); c++) {
data.f[c] = log2f(op[0]->value.f[c]);
}
break;
case ir_unop_dFdx:
case ir_unop_dFdy:
assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);
for (unsigned c = 0; c < ir->operands[0]->type->components(); c++) {
data.f[c] = 0.0;
}
break;
case ir_binop_dot:
assert(op[0]->type->is_vector() && op[1]->type->is_vector());
data.f[0] = 0;
for (unsigned c = 0; c < op[0]->type->components(); c++) {
switch (ir->operands[0]->type->base_type) {
case GLSL_TYPE_UINT:
data.u[0] += op[0]->value.u[c] * op[1]->value.u[c];
break;
case GLSL_TYPE_INT:
data.i[0] += op[0]->value.i[c] * op[1]->value.i[c];
break;
case GLSL_TYPE_FLOAT:
data.f[0] += op[0]->value.f[c] * op[1]->value.f[c];
break;
default:
assert(0);
}
}
break;
case ir_binop_add:
assert(op[0]->type == op[1]->type || op0_scalar || op1_scalar);
for (unsigned c = 0, c0 = 0, c1 = 0;
c < components;
c0 += c0_inc, c1 += c1_inc, c++) {
switch (ir->operands[0]->type->base_type) {
case GLSL_TYPE_UINT:
data.u[c] = op[0]->value.u[c0] + op[1]->value.u[c1];
break;
case GLSL_TYPE_INT:
data.i[c] = op[0]->value.i[c0] + op[1]->value.i[c1];
break;
case GLSL_TYPE_FLOAT:
data.f[c] = op[0]->value.f[c0] + op[1]->value.f[c1];
break;
default:
assert(0);
}
}
break;
case ir_binop_sub:
assert(op[0]->type == op[1]->type || op0_scalar || op1_scalar);
for (unsigned c = 0, c0 = 0, c1 = 0;
c < components;
c0 += c0_inc, c1 += c1_inc, c++) {
switch (ir->operands[0]->type->base_type) {
case GLSL_TYPE_UINT:
data.u[c] = op[0]->value.u[c0] - op[1]->value.u[c1];
break;
case GLSL_TYPE_INT:
data.i[c] = op[0]->value.i[c0] - op[1]->value.i[c1];
break;
case GLSL_TYPE_FLOAT:
data.f[c] = op[0]->value.f[c0] - op[1]->value.f[c1];
break;
default:
assert(0);
}
}
break;
case ir_binop_mul:
/* Check for equal types, or unequal types involving scalars */
if ((op[0]->type == op[1]->type && !op[0]->type->is_matrix())
|| op0_scalar || op1_scalar) {
for (unsigned c = 0, c0 = 0, c1 = 0;
c < components;
c0 += c0_inc, c1 += c1_inc, c++) {
switch (ir->operands[0]->type->base_type) {
case GLSL_TYPE_UINT:
data.u[c] = op[0]->value.u[c0] * op[1]->value.u[c1];
break;
case GLSL_TYPE_INT:
data.i[c] = op[0]->value.i[c0] * op[1]->value.i[c1];
break;
case GLSL_TYPE_FLOAT:
data.f[c] = op[0]->value.f[c0] * op[1]->value.f[c1];
break;
default:
assert(0);
}
}
} else {
assert(op[0]->type->is_matrix() || op[1]->type->is_matrix());
/* Multiply an N-by-M matrix with an M-by-P matrix. Since either
* matrix can be a GLSL vector, either N or P can be 1.
*
* For vec*mat, the vector is treated as a row vector. This
* means the vector is a 1-row x M-column matrix.
*
* For mat*vec, the vector is treated as a column vector. Since
* matrix_columns is 1 for vectors, this just works.
*/
const unsigned n = op[0]->type->is_vector()
? 1 : op[0]->type->vector_elements;
const unsigned m = op[1]->type->vector_elements;
const unsigned p = op[1]->type->matrix_columns;
for (unsigned j = 0; j < p; j++) {
for (unsigned i = 0; i < n; i++) {
for (unsigned k = 0; k < m; k++) {
data.f[i+n*j] += op[0]->value.f[i+n*k]*op[1]->value.f[k+m*j];
}
}
}
}
break;
case ir_binop_div:
assert(op[0]->type == op[1]->type || op0_scalar || op1_scalar);
for (unsigned c = 0, c0 = 0, c1 = 0;
c < components;
c0 += c0_inc, c1 += c1_inc, c++) {
switch (ir->operands[0]->type->base_type) {
case GLSL_TYPE_UINT:
data.u[c] = op[0]->value.u[c0] / op[1]->value.u[c1];
break;
case GLSL_TYPE_INT:
data.i[c] = op[0]->value.i[c0] / op[1]->value.i[c1];
break;
case GLSL_TYPE_FLOAT:
data.f[c] = op[0]->value.f[c0] / op[1]->value.f[c1];
break;
default:
assert(0);
}
}
break;
case ir_binop_logic_and:
assert(op[0]->type->base_type == GLSL_TYPE_BOOL);
for (unsigned c = 0; c < ir->operands[0]->type->components(); c++)
data.b[c] = op[0]->value.b[c] && op[1]->value.b[c];
break;
case ir_binop_logic_xor:
assert(op[0]->type->base_type == GLSL_TYPE_BOOL);
for (unsigned c = 0; c < ir->operands[0]->type->components(); c++)
data.b[c] = op[0]->value.b[c] ^ op[1]->value.b[c];
break;
case ir_binop_logic_or:
assert(op[0]->type->base_type == GLSL_TYPE_BOOL);
for (unsigned c = 0; c < ir->operands[0]->type->components(); c++)
data.b[c] = op[0]->value.b[c] || op[1]->value.b[c];
break;
case ir_binop_less:
switch (ir->operands[0]->type->base_type) {
case GLSL_TYPE_UINT:
data.b[0] = op[0]->value.u[0] < op[1]->value.u[0];
break;
case GLSL_TYPE_INT:
data.b[0] = op[0]->value.i[0] < op[1]->value.i[0];
break;
case GLSL_TYPE_FLOAT:
data.b[0] = op[0]->value.f[0] < op[1]->value.f[0];
break;
default:
assert(0);
}
break;
case ir_binop_greater:
switch (ir->operands[0]->type->base_type) {
case GLSL_TYPE_UINT:
data.b[0] = op[0]->value.u[0] > op[1]->value.u[0];
break;
case GLSL_TYPE_INT:
data.b[0] = op[0]->value.i[0] > op[1]->value.i[0];
break;
case GLSL_TYPE_FLOAT:
data.b[0] = op[0]->value.f[0] > op[1]->value.f[0];
break;
default:
assert(0);
}
break;
case ir_binop_lequal:
switch (ir->operands[0]->type->base_type) {
case GLSL_TYPE_UINT:
data.b[0] = op[0]->value.u[0] <= op[1]->value.u[0];
break;
case GLSL_TYPE_INT:
data.b[0] = op[0]->value.i[0] <= op[1]->value.i[0];
break;
case GLSL_TYPE_FLOAT:
data.b[0] = op[0]->value.f[0] <= op[1]->value.f[0];
break;
default:
assert(0);
}
break;
case ir_binop_gequal:
switch (ir->operands[0]->type->base_type) {
case GLSL_TYPE_UINT:
data.b[0] = op[0]->value.u[0] >= op[1]->value.u[0];
break;
case GLSL_TYPE_INT:
data.b[0] = op[0]->value.i[0] >= op[1]->value.i[0];
break;
case GLSL_TYPE_FLOAT:
data.b[0] = op[0]->value.f[0] >= op[1]->value.f[0];
break;
default:
assert(0);
}
break;
case ir_binop_equal:
data.b[0] = true;
for (unsigned c = 0; c < ir->operands[0]->type->components(); c++) {
switch (ir->operands[0]->type->base_type) {
case GLSL_TYPE_UINT:
data.b[0] = data.b[0] && op[0]->value.u[c] == op[1]->value.u[c];
break;
case GLSL_TYPE_INT:
data.b[0] = data.b[0] && op[0]->value.i[c] == op[1]->value.i[c];
break;
case GLSL_TYPE_FLOAT:
data.b[0] = data.b[0] && op[0]->value.f[c] == op[1]->value.f[c];
break;
case GLSL_TYPE_BOOL:
data.b[0] = data.b[0] && op[0]->value.b[c] == op[1]->value.b[c];
break;
default:
assert(0);
}
}
break;
case ir_binop_nequal:
data.b[0] = false;
for (unsigned c = 0; c < ir->operands[0]->type->components(); c++) {
switch (ir->operands[0]->type->base_type) {
case GLSL_TYPE_UINT:
data.b[0] = data.b[0] || op[0]->value.u[c] != op[1]->value.u[c];
break;
case GLSL_TYPE_INT:
data.b[0] = data.b[0] || op[0]->value.i[c] != op[1]->value.i[c];
break;
case GLSL_TYPE_FLOAT:
data.b[0] = data.b[0] || op[0]->value.f[c] != op[1]->value.f[c];
break;
case GLSL_TYPE_BOOL:
data.b[0] = data.b[0] || op[0]->value.b[c] != op[1]->value.b[c];
break;
default:
assert(0);
}
}
break;
default:
/* FINISHME: Should handle all expression types. */
return;
}
void *ctx = talloc_parent(ir);
this->value = new(ctx) ir_constant(ir->type, &data);
}
void
ir_constant_visitor::visit(ir_texture *ir)
{
// FINISHME: Do stuff with texture lookups
(void) ir;
value = NULL;
}
void
ir_constant_visitor::visit(ir_swizzle *ir)
{
ir_constant *v = ir->val->constant_expression_value();
this->value = NULL;
if (v != NULL) {
ir_constant_data data;
const unsigned swiz_idx[4] = {
ir->mask.x, ir->mask.y, ir->mask.z, ir->mask.w
};
for (unsigned i = 0; i < ir->mask.num_components; i++) {
switch (v->type->base_type) {
case GLSL_TYPE_UINT:
case GLSL_TYPE_INT: data.u[i] = v->value.u[swiz_idx[i]]; break;
case GLSL_TYPE_FLOAT: data.f[i] = v->value.f[swiz_idx[i]]; break;
case GLSL_TYPE_BOOL: data.b[i] = v->value.b[swiz_idx[i]]; break;
default: assert(!"Should not get here."); break;
}
}
void *ctx = talloc_parent(ir);
this->value = new(ctx) ir_constant(ir->type, &data);
}
}
void
ir_constant_visitor::visit(ir_dereference_variable *ir)
{
value = NULL;
ir_variable *var = ir->variable_referenced();
if (var && var->constant_value)
value = var->constant_value->clone(NULL);
}
void
ir_constant_visitor::visit(ir_dereference_array *ir)
{
void *ctx = talloc_parent(ir);
ir_constant *array = ir->array->constant_expression_value();
ir_constant *idx = ir->array_index->constant_expression_value();
this->value = NULL;
if ((array != NULL) && (idx != NULL)) {
if (array->type->is_matrix()) {
/* Array access of a matrix results in a vector.
*/
const unsigned column = idx->value.u[0];
const glsl_type *const column_type = array->type->column_type();
/* Offset in the constant matrix to the first element of the column
* to be extracted.
*/
const unsigned mat_idx = column * column_type->vector_elements;
ir_constant_data data;
switch (column_type->base_type) {
case GLSL_TYPE_UINT:
case GLSL_TYPE_INT:
for (unsigned i = 0; i < column_type->vector_elements; i++)
data.u[i] = array->value.u[mat_idx + i];
break;
case GLSL_TYPE_FLOAT:
for (unsigned i = 0; i < column_type->vector_elements; i++)
data.f[i] = array->value.f[mat_idx + i];
break;
default:
assert(!"Should not get here.");
break;
}
this->value = new(ctx) ir_constant(column_type, &data);
} else if (array->type->is_vector()) {
const unsigned component = idx->value.u[0];
this->value = new(ctx) ir_constant(array, component);
} else {
/* FINISHME: Handle access of constant arrays. */
}
}
}
void
ir_constant_visitor::visit(ir_dereference_record *ir)
{
ir_constant *v = ir->record->constant_expression_value();
this->value = (v != NULL) ? v->get_record_field(ir->field) : NULL;
}
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_discard *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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