summaryrefslogtreecommitdiffstats
path: root/src/glsl/lower_named_interface_blocks.cpp
blob: 01bbdd0587e2db4413a38b31b8931ef9225a50d5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
/*
 * Copyright (c) 2013 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 lower_named_interface_blocks.cpp
 *
 * This lowering pass converts all interface blocks with instance names
 * into interface blocks without an instance name.
 *
 * For example, the following shader:
 *
 *   out block {
 *     float block_var;
 *   } inst_name;
 *
 *   main()
 *   {
 *     inst_name.block_var = 0.0;
 *   }
 *
 * Is rewritten to:
 *
 *   out block {
 *     float block_var;
 *   };
 *
 *   main()
 *   {
 *     block_var = 0.0;
 *   }
 *
 * This takes place after the shader code has already been verified with
 * the interface name in place.
 *
 * The linking phase will use the interface block name rather than the
 * interface's instance name when linking interfaces.
 *
 * This modification to the ir allows our currently existing dead code
 * elimination to work with interface blocks without changes.
 */

#include "glsl_symbol_table.h"
#include "ir.h"
#include "ir_optimization.h"
#include "ir_rvalue_visitor.h"
#include "program/hash_table.h"

namespace {

class flatten_named_interface_blocks_declarations : public ir_rvalue_visitor
{
public:
   void * const mem_ctx;
   hash_table *interface_namespace;

   flatten_named_interface_blocks_declarations(void *mem_ctx)
      : mem_ctx(mem_ctx),
        interface_namespace(NULL)
   {
   }

   void run(exec_list *instructions);

   virtual ir_visitor_status visit_leave(ir_assignment *);
   virtual void handle_rvalue(ir_rvalue **rvalue);
};

} /* anonymous namespace */

void
flatten_named_interface_blocks_declarations::run(exec_list *instructions)
{
   interface_namespace = hash_table_ctor(0, hash_table_string_hash,
                                         hash_table_string_compare);

   /* First pass: adjust instance block variables with an instance name
    * to not have an instance name.
    *
    * The interface block variables are stored in the interface_namespace
    * hash table so they can be used in the second pass.
    */
   foreach_in_list_safe(ir_instruction, node, instructions) {
      ir_variable *var = node->as_variable();
      if (!var || !var->is_interface_instance())
         continue;

      /* It should be possible to handle uniforms during this pass,
       * but, this will require changes to the other uniform block
       * support code.
       */
      if (var->data.mode == ir_var_uniform ||
          var->data.mode == ir_var_shader_storage)
         continue;

      const glsl_type * iface_t = var->type;
      const glsl_type * array_t = NULL;
      exec_node *insert_pos = var;

      if (iface_t->is_array()) {
         array_t = iface_t;
         iface_t = array_t->fields.array;
      }

      assert (iface_t->is_interface());

      for (unsigned i = 0; i < iface_t->length; i++) {
         const char * field_name = iface_t->fields.structure[i].name;
         char *iface_field_name =
            ralloc_asprintf(mem_ctx, "%s %s.%s.%s",
                            var->data.mode == ir_var_shader_in ? "in" : "out",
                            iface_t->name, var->name, field_name);

         ir_variable *found_var =
            (ir_variable *) hash_table_find(interface_namespace,
                                            iface_field_name);
         if (!found_var) {
            ir_variable *new_var;
            char *var_name =
               ralloc_strdup(mem_ctx, iface_t->fields.structure[i].name);
            if (array_t == NULL) {
               new_var =
                  new(mem_ctx) ir_variable(iface_t->fields.structure[i].type,
                                           var_name,
                                           (ir_variable_mode) var->data.mode);
               new_var->data.from_named_ifc_block_nonarray = 1;
            } else {
               const glsl_type *new_array_type =
                  glsl_type::get_array_instance(
                     iface_t->fields.structure[i].type,
                     array_t->length);
               new_var =
                  new(mem_ctx) ir_variable(new_array_type,
                                           var_name,
                                           (ir_variable_mode) var->data.mode);
               new_var->data.from_named_ifc_block_array = 1;
            }
            new_var->data.location = iface_t->fields.structure[i].location;
            new_var->data.explicit_location = (new_var->data.location >= 0);
            new_var->data.interpolation =
               iface_t->fields.structure[i].interpolation;
            new_var->data.centroid = iface_t->fields.structure[i].centroid;
            new_var->data.sample = iface_t->fields.structure[i].sample;
            new_var->data.patch = iface_t->fields.structure[i].patch;

            new_var->init_interface_type(iface_t);
            hash_table_insert(interface_namespace, new_var,
                              iface_field_name);
            insert_pos->insert_after(new_var);
            insert_pos = new_var;
         }
      }
      var->remove();
   }

   /* Second pass: visit all ir_dereference_record instances, and if they
    * reference an interface block, then flatten the refererence out.
    */
   visit_list_elements(this, instructions);
   hash_table_dtor(interface_namespace);
   interface_namespace = NULL;
}

ir_visitor_status
flatten_named_interface_blocks_declarations::visit_leave(ir_assignment *ir)
{
   ir_dereference_record *lhs_rec = ir->lhs->as_dereference_record();
   if (lhs_rec) {
      ir_rvalue *lhs_rec_tmp = lhs_rec;
      handle_rvalue(&lhs_rec_tmp);
      if (lhs_rec_tmp != lhs_rec) {
         ir->set_lhs(lhs_rec_tmp);
      }
   }
   return rvalue_visit(ir);
}

void
flatten_named_interface_blocks_declarations::handle_rvalue(ir_rvalue **rvalue)
{
   if (*rvalue == NULL)
      return;

   ir_dereference_record *ir = (*rvalue)->as_dereference_record();
   if (ir == NULL)
      return;

   ir_variable *var = ir->variable_referenced();
   if (var == NULL)
      return;

   if (!var->is_interface_instance())
      return;

   /* It should be possible to handle uniforms during this pass,
    * but, this will require changes to the other uniform block
    * support code.
    */
   if (var->data.mode == ir_var_uniform || var->data.mode == ir_var_shader_storage)
      return;

   if (var->get_interface_type() != NULL) {
      char *iface_field_name =
         ralloc_asprintf(mem_ctx, "%s %s.%s.%s",
                         var->data.mode == ir_var_shader_in ? "in" : "out",
                         var->get_interface_type()->name,
                         var->name, ir->field);
      /* Find the variable in the set of flattened interface blocks */
      ir_variable *found_var =
         (ir_variable *) hash_table_find(interface_namespace,
                                         iface_field_name);
      assert(found_var);

      ir_dereference_variable *deref_var =
         new(mem_ctx) ir_dereference_variable(found_var);

      ir_dereference_array *deref_array =
         ir->record->as_dereference_array();
      if (deref_array != NULL) {
         *rvalue =
            new(mem_ctx) ir_dereference_array(deref_var,
                                              deref_array->array_index);
      } else {
         *rvalue = deref_var;
      }
   }
}

void
lower_named_interface_blocks(void *mem_ctx, gl_shader *shader)
{
   flatten_named_interface_blocks_declarations v_decl(mem_ctx);
   v_decl.run(shader->ir);
}