ir.cpp

   1 /*
   2  * Copyright © 2010 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21  * DEALINGS IN THE SOFTWARE.
  22  */
  23 #include <string.h>
  24 #include "main/imports.h"
  25 #include "main/simple_list.h"
  26 #include "ir.h"
  27 #include "glsl_types.h"
  28
  29 ir_assignment::ir_assignment(ir_instruction *lhs, ir_instruction *rhs,
  30                              ir_expression *condition)
  31    : ir_instruction(ir_op_assign)
  32 {
  33    this->lhs = (ir_dereference *) lhs;
  34    this->rhs = rhs;
  35    this->condition = condition;
  36 }
  37
  38
  39 ir_expression::ir_expression(int op, const struct glsl_type *type,
  40                              ir_instruction *op0, ir_instruction *op1)
  41    : ir_instruction(ir_op_expression)
  42 {
  43    this->type = type;
  44    this->operation = ir_expression_operation(op);
  45    this->operands[0] = op0;
  46    this->operands[1] = op1;
  47 }
  48
  49
  50 ir_label::ir_label(const char *label)
  51    : ir_instruction(ir_op_label), label(label)
  52 {
  53    /* empty */
  54 }
  55
  56
  57 ir_constant::ir_constant(const struct glsl_type *type, const void *data)
  58    : ir_instruction(ir_op_constant)
  59 {
  60    const unsigned elements =
  61       ((type->vector_elements == 0) ? 1 : type->vector_elements)
  62       * ((type->matrix_rows == 0) ? 1 : type->matrix_rows);
  63    unsigned size = 0;
  64
  65    this->type = type;
  66    switch (type->base_type) {
  67    case GLSL_TYPE_UINT:  size = sizeof(this->value.u[0]); break;
  68    case GLSL_TYPE_INT:   size = sizeof(this->value.i[0]); break;
  69    case GLSL_TYPE_FLOAT: size = sizeof(this->value.f[0]); break;
  70    case GLSL_TYPE_BOOL:  size = sizeof(this->value.b[0]); break;
  71    default:
  72       /* FINISHME: What to do?  Exceptions are not the answer.
  73        */
  74       break;
  75    }
  76
  77    memcpy(& this->value, data, size * elements);
  78 }
  79
  80
  81 ir_dereference::ir_dereference(ir_instruction *var)
  82    : ir_instruction(ir_op_dereference)
  83 {
  84    this->mode = ir_reference_variable;
  85    this->var = var;
  86    this->type = (var != NULL) ? var->type : glsl_error_type;
  87 }
  88
  89
  90 void
  91 ir_dereference::set_swizzle(unsigned x, unsigned y, unsigned z, unsigned w,
  92                             unsigned count)
  93 {
  94    assert((count >= 1) && (count <= 4));
  95
  96    const unsigned dup_mask = 0
  97       | ((count > 1) ? ((1U << y) & ((1U << x)                        )) : 0)
  98       | ((count > 2) ? ((1U << z) & ((1U << x) | (1U << y)            )) : 0)
  99       | ((count > 3) ? ((1U << w) & ((1U << x) | (1U << y) | (1U << z))) : 0);
 100
 101    assert(x <= 3);
 102    assert(y <= 3);
 103    assert(z <= 3);
 104    assert(w <= 3);
 105
 106    selector.swizzle.x = x;
 107    selector.swizzle.y = y;
 108    selector.swizzle.z = z;
 109    selector.swizzle.w = w;
 110    selector.swizzle.num_components = count;
 111    selector.swizzle.has_duplicates = dup_mask != 0;
 112 }
 113
 114
 115
 116 ir_variable::ir_variable(const struct glsl_type *type, const char *name)
 117    : ir_instruction(ir_op_var_decl), read_only(false), centroid(false),
 118      invariant(false), mode(ir_var_auto), interpolation(ir_var_smooth)
 119 {
 120    this->type = type;
 121    this->name = name;
 122 }
 123
 124
 125 ir_function_signature::ir_function_signature(const glsl_type *return_type)
 126    : ir_instruction(ir_op_func_sig), return_type(return_type), definition(NULL)
 127 {
 128    /* empty */
 129 }
 130
 131
 132 ir_function::ir_function(const char *name)
 133    : ir_instruction(ir_op_func), name(name)
 134 {
 135    /* empty */
 136 }
 137
 138
 139 ir_call *
 140 ir_call::get_error_instruction()
 141 {
 142    ir_call *call = new ir_call;
 143
 144    call->type = glsl_error_type;
 145    return call;
 146 }