/*
* 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.
*/
#include <string.h>
#include "main/imports.h"
#include "main/simple_list.h"
#include "ir.h"
#include "ir_visitor.h"
#include "glsl_types.h"
ir_assignment::ir_assignment(ir_rvalue *lhs, ir_rvalue *rhs,
ir_rvalue *condition)
{
this->lhs = lhs;
this->rhs = rhs;
this->condition = condition;
}
ir_expression::ir_expression(int op, const struct glsl_type *type,
ir_rvalue *op0, ir_rvalue *op1)
{
this->type = type;
this->operation = ir_expression_operation(op);
this->operands[0] = op0;
this->operands[1] = op1;
}
unsigned int
ir_expression::get_num_operands(void)
{
/* Update ir_print_visitor.cpp when updating this list. */
const int num_operands[] = {
1, /* ir_unop_bit_not */
1, /* ir_unop_logic_not */
1, /* ir_unop_neg */
1, /* ir_unop_abs */
1, /* ir_unop_rcp */
1, /* ir_unop_rsq */
1, /* ir_unop_sqrt */
1, /* ir_unop_exp */
1, /* ir_unop_log */
1, /* ir_unop_exp2 */
1, /* ir_unop_log2 */
1, /* ir_unop_f2i */
1, /* ir_unop_i2f */
1, /* ir_unop_f2b */
1, /* ir_unop_b2f */
1, /* ir_unop_i2b */
1, /* ir_unop_b2i */
1, /* ir_unop_u2f */
1, /* ir_unop_trunc */
1, /* ir_unop_ceil */
1, /* ir_unop_floor */
2, /* ir_binop_add */
2, /* ir_binop_sub */
2, /* ir_binop_mul */
2, /* ir_binop_div */
2, /* ir_binop_mod */
2, /* ir_binop_less */
2, /* ir_binop_greater */
2, /* ir_binop_lequal */
2, /* ir_binop_gequal */
2, /* ir_binop_equal */
2, /* ir_binop_nequal */
2, /* ir_binop_lshift */
2, /* ir_binop_rshift */
2, /* ir_binop_bit_and */
2, /* ir_binop_bit_xor */
2, /* ir_binop_bit_or */
2, /* ir_binop_logic_and */
2, /* ir_binop_logic_xor */
2, /* ir_binop_logic_or */
2, /* ir_binop_dot */
2, /* ir_binop_min */
2, /* ir_binop_max */
2, /* ir_binop_pow */
};
assert(sizeof(num_operands) / sizeof(num_operands[0]) == ir_binop_pow + 1);
return num_operands[this->operation];
}
ir_constant::ir_constant(const struct glsl_type *type, const void *data)
{
unsigned size = 0;
this->type = type;
switch (type->base_type) {
case GLSL_TYPE_UINT: size = sizeof(this->value.u[0]); break;
case GLSL_TYPE_INT: size = sizeof(this->value.i[0]); break;
case GLSL_TYPE_FLOAT: size = sizeof(this->value.f[0]); break;
case GLSL_TYPE_BOOL: size = sizeof(this->value.b[0]); break;
default:
/* FINISHME: What to do? Exceptions are not the answer.
*/
break;
}
memcpy(& this->value, data, size * type->components());
}
ir_constant::ir_constant(float f)
{
this->type = glsl_type::float_type;
this->value.f[0] = f;
}
ir_constant::ir_constant(unsigned int u)
{
this->type = glsl_type::uint_type;
this->value.u[0] = u;
}
ir_constant::ir_constant(int i)
{
this->type = glsl_type::int_type;
this->value.i[0] = i;
}
ir_constant::ir_constant(bool b)
{
this->type = glsl_type::bool_type;
this->value.b[0] = b;
}
ir_dereference::ir_dereference(ir_instruction *var)
{
this->mode = ir_reference_variable;
this->var = var;
this->type = (var != NULL) ? var->type : glsl_type::error_type;
}
ir_dereference::ir_dereference(ir_instruction *var,
ir_rvalue *array_index)
: mode(ir_reference_array), var(var)
{
type = glsl_type::error_type;
if (var != NULL) {
const glsl_type *const vt = var->type;
if (vt->is_array()) {
type = vt->element_type();
} else if (vt->is_matrix()) {
type = vt->column_type();
} else if (vt->is_vector()) {
type = vt->get_base_type();
}
}
this->selector.array_index = array_index;
}
bool
ir_dereference::is_lvalue()
{
if (var == NULL)
return false;
if (mode == ir_reference_variable) {
ir_variable *const as_var = var->as_variable();
if (as_var == NULL)
return false;
if (as_var->type->is_array() && !as_var->array_lvalue)
return false;
return !as_var->read_only;
} else if (mode == ir_reference_array) {
/* FINISHME: Walk up the dereference chain and figure out if
* FINISHME: the variable is read-only.
*/
}
return true;
}
ir_swizzle::ir_swizzle(ir_rvalue *val, unsigned x, unsigned y, unsigned z,
unsigned w, unsigned count)
: val(val)
{
assert((count >= 1) && (count <= 4));
const unsigned dup_mask = 0
| ((count > 1) ? ((1U << y) & ((1U << x) )) : 0)
| ((count > 2) ? ((1U << z) & ((1U << x) | (1U << y) )) : 0)
| ((count > 3) ? ((1U << w) & ((1U << x) | (1U << y) | (1U << z))) : 0);
assert(x <= 3);
assert(y <= 3);
assert(z <= 3);
assert(w <= 3);
mask.x = x;
mask.y = y;
mask.z = z;
mask.w = w;
mask.num_components = count;
mask.has_duplicates = dup_mask != 0;
/* Based on the number of elements in the swizzle and the base type
* (i.e., float, int, unsigned, or bool) of the vector being swizzled,
* generate the type of the resulting value.
*/
type = glsl_type::get_instance(val->type->base_type, mask.num_components, 1);
}
#define X 1
#define R 5
#define S 9
#define I 13
ir_swizzle *
ir_swizzle::create(ir_rvalue *val, const char *str, unsigned vector_length)
{
/* For each possible swizzle character, this table encodes the value in
* \c idx_map that represents the 0th element of the vector. For invalid
* swizzle characters (e.g., 'k'), a special value is used that will allow
* detection of errors.
*/
static const unsigned char base_idx[26] = {
/* a b c d e f g h i j k l m */
R, R, I, I, I, I, R, I, I, I, I, I, I,
/* n o p q r s t u v w x y z */
I, I, S, S, R, S, S, I, I, X, X, X, X
};
/* Each valid swizzle character has an entry in the previous table. This
* table encodes the base index encoded in the previous table plus the actual
* index of the swizzle character. When processing swizzles, the first
* character in the string is indexed in the previous table. Each character
* in the string is indexed in this table, and the value found there has the
* value form the first table subtracted. The result must be on the range
* [0,3].
*
* For example, the string "wzyx" will get X from the first table. Each of
* the charcaters will get X+3, X+2, X+1, and X+0 from this table. After
* subtraction, the swizzle values are { 3, 2, 1, 0 }.
*
* The string "wzrg" will get X from the first table. Each of the characters
* will get X+3, X+2, R+0, and R+1 from this table. After subtraction, the
* swizzle values are { 3, 2, 4, 5 }. Since 4 and 5 are outside the range
* [0,3], the error is detected.
*/
static const unsigned char idx_map[26] = {
/* a b c d e f g h i j k l m */
R+3, R+2, 0, 0, 0, 0, R+1, 0, 0, 0, 0, 0, 0,
/* n o p q r s t u v w x y z */
0, 0, S+2, S+3, R+0, S+0, S+1, 0, 0, X+3, X+0, X+1, X+2
};
int swiz_idx[4] = { 0, 0, 0, 0 };
unsigned i;
/* Validate the first character in the swizzle string and look up the base
* index value as described above.
*/
if ((str[0] < 'a') || (str[0] > 'z'))
return NULL;
const unsigned base = base_idx[str[0] - 'a'];
for (i = 0; (i < 4) && (str[i] != '\0'); i++) {
/* Validate the next character, and, as described above, convert it to a
* swizzle index.
*/
if ((str[i] < 'a') || (str[i] > 'z'))
return NULL;
swiz_idx[i] = idx_map[str[i] - 'a'] - base;
if ((swiz_idx[i] < 0) || (swiz_idx[i] >= (int) vector_length))
return NULL;
}
if (str[i] != '\0')
return NULL;
return new ir_swizzle(val, swiz_idx[0], swiz_idx[1], swiz_idx[2],
swiz_idx[3], i);
}
#undef X
#undef R
#undef S
#undef I
ir_variable::ir_variable(const struct glsl_type *type, const char *name)
: max_array_access(0), read_only(false), centroid(false), invariant(false),
mode(ir_var_auto), interpolation(ir_var_smooth)
{
this->type = type;
this->name = name;
this->constant_value = NULL;
if (type && type->base_type == GLSL_TYPE_SAMPLER)
this->read_only = true;
}
ir_function_signature::ir_function_signature(const glsl_type *return_type)
: return_type(return_type), is_defined(false)
{
/* empty */
}
ir_function::ir_function(const char *name)
: name(name)
{
/* empty */
}
ir_call *
ir_call::get_error_instruction()
{
ir_call *call = new ir_call;
call->type = glsl_type::error_type;
return call;
}
void
visit_exec_list(exec_list *list, ir_visitor *visitor)
{
foreach_iter(exec_list_iterator, iter, *list) {
((ir_instruction *)iter.get())->accept(visitor);
}
}