src/compiler/glsl/link_uniform_initializers.cpp

   1 /*
   2  * Copyright © 2012 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
  24 #include "main/core.h"
  25 #include "ir.h"
  26 #include "linker.h"
  27 #include "ir_uniform.h"
  28
  29 /* These functions are put in a "private" namespace instead of being marked
  30  * static so that the unit tests can access them.  See
  31  * http://code.google.com/p/googletest/wiki/AdvancedGuide#Testing_Private_Code
  32  */
  33 namespace linker {
  34
  35 gl_uniform_storage *
  36 get_storage(gl_uniform_storage *storage, unsigned num_storage,
  37             const char *name)
  38 {
  39    for (unsigned int i = 0; i < num_storage; i++) {
  40       if (strcmp(name, storage[i].name) == 0)
  41          return &storage[i];
  42    }
  43
  44    return NULL;
  45 }
  46
  47 static unsigned
  48 get_uniform_block_index(const gl_shader_program *shProg,
  49                         const char *uniformBlockName)
  50 {
  51    for (unsigned i = 0; i < shProg->NumBufferInterfaceBlocks; i++) {
  52       if (!strcmp(shProg->BufferInterfaceBlocks[i].Name, uniformBlockName))
  53          return i;
  54    }
  55
  56    return GL_INVALID_INDEX;
  57 }
  58
  59 void
  60 copy_constant_to_storage(union gl_constant_value *storage,
  61                          const ir_constant *val,
  62                          const enum glsl_base_type base_type,
  63                          const unsigned int elements,
  64                          unsigned int boolean_true)
  65 {
  66    for (unsigned int i = 0; i < elements; i++) {
  67       switch (base_type) {
  68       case GLSL_TYPE_UINT:
  69          storage[i].u = val->value.u[i];
  70          break;
  71       case GLSL_TYPE_INT:
  72       case GLSL_TYPE_SAMPLER:
  73          storage[i].i = val->value.i[i];
  74          break;
  75       case GLSL_TYPE_FLOAT:
  76          storage[i].f = val->value.f[i];
  77          break;
  78       case GLSL_TYPE_DOUBLE:
  79          /* XXX need to check on big-endian */
  80          storage[i * 2].u = *(uint32_t *)&val->value.d[i];
  81          storage[i * 2 + 1].u = *(((uint32_t *)&val->value.d[i]) + 1);
  82          break;
  83       case GLSL_TYPE_BOOL:
  84          storage[i].b = val->value.b[i] ? boolean_true : 0;
  85          break;
  86       case GLSL_TYPE_ARRAY:
  87       case GLSL_TYPE_STRUCT:
  88       case GLSL_TYPE_IMAGE:
  89       case GLSL_TYPE_ATOMIC_UINT:
  90       case GLSL_TYPE_INTERFACE:
  91       case GLSL_TYPE_VOID:
  92       case GLSL_TYPE_SUBROUTINE:
  93       case GLSL_TYPE_FUNCTION:
  94       case GLSL_TYPE_ERROR:
  95          /* All other types should have already been filtered by other
  96           * paths in the caller.
  97           */
  98          assert(!"Should not get here.");
  99          break;
 100       }
 101    }
 102 }
 103
 104 /**
 105  * Initialize an opaque uniform from the value of an explicit binding
 106  * qualifier specified in the shader.  Atomic counters are different because
 107  * they have no storage and should be handled elsewhere.
 108  */
 109 void
 110 set_opaque_binding(void *mem_ctx, gl_shader_program *prog,
 111                    const glsl_type *type, const char *name, int *binding)
 112 {
 113
 114    if (type->is_array() && type->fields.array->is_array()) {
 115       const glsl_type *const element_type = type->fields.array;
 116
 117       for (unsigned int i = 0; i < type->length; i++) {
 118          const char *element_name = ralloc_asprintf(mem_ctx, "%s[%d]", name, i);
 119
 120          set_opaque_binding(mem_ctx, prog, element_type,
 121                             element_name, binding);
 122       }
 123    } else {
 124       struct gl_uniform_storage *const storage =
 125          get_storage(prog->UniformStorage, prog->NumUniformStorage, name);
 126
 127       if (storage == NULL) {
 128          assert(storage != NULL);
 129          return;
 130       }
 131
 132       const unsigned elements = MAX2(storage->array_elements, 1);
 133
 134       /* Section 4.4.4 (Opaque-Uniform Layout Qualifiers) of the GLSL 4.20 spec
 135        * says:
 136        *
 137        *     "If the binding identifier is used with an array, the first element
 138        *     of the array takes the specified unit and each subsequent element
 139        *     takes the next consecutive unit."
 140        */
 141       for (unsigned int i = 0; i < elements; i++) {
 142          storage->storage[i].i = (*binding)++;
 143       }
 144
 145       for (int sh = 0; sh < MESA_SHADER_STAGES; sh++) {
 146         gl_shader *shader = prog->_LinkedShaders[sh];
 147
 148          if (shader) {
 149             if (storage->type->base_type == GLSL_TYPE_SAMPLER &&
 150                 storage->opaque[sh].active) {
 151                for (unsigned i = 0; i < elements; i++) {
 152                   const unsigned index = storage->opaque[sh].index + i;
 153                   shader->SamplerUnits[index] = storage->storage[i].i;
 154                }
 155
 156             } else if (storage->type->base_type == GLSL_TYPE_IMAGE &&
 157                     storage->opaque[sh].active) {
 158                for (unsigned i = 0; i < elements; i++) {
 159                   const unsigned index = storage->opaque[sh].index + i;
 160                   shader->ImageUnits[index] = storage->storage[i].i;
 161                }
 162             }
 163          }
 164       }
 165    }
 166 }
 167
 168 void
 169 set_block_binding(gl_shader_program *prog, const char *block_name, int binding)
 170 {
 171    const unsigned block_index = get_uniform_block_index(prog, block_name);
 172
 173    if (block_index == GL_INVALID_INDEX) {
 174       assert(block_index != GL_INVALID_INDEX);
 175       return;
 176    }
 177
 178       /* This is a field of a UBO.  val is the binding index. */
 179       for (int i = 0; i < MESA_SHADER_STAGES; i++) {
 180          int stage_index = prog->InterfaceBlockStageIndex[i][block_index];
 181
 182          if (stage_index != -1) {
 183             struct gl_shader *sh = prog->_LinkedShaders[i];
 184             sh->BufferInterfaceBlocks[stage_index]->Binding = binding;
 185          }
 186       }
 187 }
 188
 189 void
 190 set_uniform_initializer(void *mem_ctx, gl_shader_program *prog,
 191                         const char *name, const glsl_type *type,
 192                         ir_constant *val, unsigned int boolean_true)
 193 {
 194    const glsl_type *t_without_array = type->without_array();
 195    if (type->is_record()) {
 196       ir_constant *field_constant;
 197
 198       field_constant = (ir_constant *)val->components.get_head();
 199
 200       for (unsigned int i = 0; i < type->length; i++) {
 201          const glsl_type *field_type = type->fields.structure[i].type;
 202          const char *field_name = ralloc_asprintf(mem_ctx, "%s.%s", name,
 203                                             type->fields.structure[i].name);
 204          set_uniform_initializer(mem_ctx, prog, field_name,
 205                                  field_type, field_constant, boolean_true);
 206          field_constant = (ir_constant *)field_constant->next;
 207       }
 208       return;
 209    } else if (t_without_array->is_record() ||
 210               (type->is_array() && type->fields.array->is_array())) {
 211       const glsl_type *const element_type = type->fields.array;
 212
 213       for (unsigned int i = 0; i < type->length; i++) {
 214          const char *element_name = ralloc_asprintf(mem_ctx, "%s[%d]", name, i);
 215
 216          set_uniform_initializer(mem_ctx, prog, element_name,
 217                                  element_type, val->array_elements[i],
 218                                  boolean_true);
 219       }
 220       return;
 221    }
 222
 223    struct gl_uniform_storage *const storage =
 224       get_storage(prog->UniformStorage,
 225                   prog->NumUniformStorage,
 226                   name);
 227    if (storage == NULL) {
 228       assert(storage != NULL);
 229       return;
 230    }
 231
 232    if (val->type->is_array()) {
 233       const enum glsl_base_type base_type =
 234          val->array_elements[0]->type->base_type;
 235       const unsigned int elements = val->array_elements[0]->type->components();
 236       unsigned int idx = 0;
 237       unsigned dmul = (base_type == GLSL_TYPE_DOUBLE) ? 2 : 1;
 238
 239       assert(val->type->length >= storage->array_elements);
 240       for (unsigned int i = 0; i < storage->array_elements; i++) {
 241          copy_constant_to_storage(& storage->storage[idx],
 242                                   val->array_elements[i],
 243                                   base_type,
 244                                   elements,
 245                                   boolean_true);
 246
 247          idx += elements * dmul;
 248       }
 249    } else {
 250       copy_constant_to_storage(storage->storage,
 251                                val,
 252                                val->type->base_type,
 253                                val->type->components(),
 254                                boolean_true);
 255
 256       if (storage->type->is_sampler()) {
 257          for (int sh = 0; sh < MESA_SHADER_STAGES; sh++) {
 258             gl_shader *shader = prog->_LinkedShaders[sh];
 259
 260             if (shader && storage->opaque[sh].active) {
 261                unsigned index = storage->opaque[sh].index;
 262
 263                shader->SamplerUnits[index] = storage->storage[0].i;
 264             }
 265          }
 266       }
 267    }
 268 }
 269 }
 270
 271 void
 272 link_set_uniform_initializers(struct gl_shader_program *prog,
 273                               unsigned int boolean_true)
 274 {
 275    void *mem_ctx = NULL;
 276
 277    for (unsigned int i = 0; i < MESA_SHADER_STAGES; i++) {
 278       struct gl_shader *shader = prog->_LinkedShaders[i];
 279
 280       if (shader == NULL)
 281          continue;
 282
 283       foreach_in_list(ir_instruction, node, shader->ir) {
 284          ir_variable *const var = node->as_variable();
 285
 286          if (!var || (var->data.mode != ir_var_uniform &&
 287              var->data.mode != ir_var_shader_storage))
 288             continue;
 289
 290          if (!mem_ctx)
 291             mem_ctx = ralloc_context(NULL);
 292
 293          if (var->data.explicit_binding) {
 294             const glsl_type *const type = var->type;
 295
 296             if (type->without_array()->is_sampler() ||
 297                 type->without_array()->is_image()) {
 298                int binding = var->data.binding;
 299                linker::set_opaque_binding(mem_ctx, prog, var->type,
 300                                           var->name, &binding);
 301             } else if (var->is_in_buffer_block()) {
 302                const glsl_type *const iface_type = var->get_interface_type();
 303
 304                /* If the variable is an array and it is an interface instance,
 305                 * we need to set the binding for each array element.  Just
 306                 * checking that the variable is an array is not sufficient.
 307                 * The variable could be an array element of a uniform block
 308                 * that lacks an instance name.  For example:
 309                 *
 310                 *     uniform U {
 311                 *         float f[4];
 312                 *     };
 313                 *
 314                 * In this case "f" would pass is_in_buffer_block (above) and
 315                 * type->is_array(), but it will fail is_interface_instance().
 316                 */
 317                if (var->is_interface_instance() && var->type->is_array()) {
 318                   for (unsigned i = 0; i < var->type->length; i++) {
 319                      const char *name =
 320                         ralloc_asprintf(mem_ctx, "%s[%u]", iface_type->name, i);
 321
 322                      /* Section 4.4.3 (Uniform Block Layout Qualifiers) of the
 323                       * GLSL 4.20 spec says:
 324                       *
 325                       *     "If the binding identifier is used with a uniform
 326                       *     block instanced as an array then the first element
 327                       *     of the array takes the specified block binding and
 328                       *     each subsequent element takes the next consecutive
 329                       *     uniform block binding point."
 330                       */
 331                      linker::set_block_binding(prog, name,
 332                                                var->data.binding + i);
 333                   }
 334                } else {
 335                   linker::set_block_binding(prog, iface_type->name,
 336                                             var->data.binding);
 337                }
 338             } else if (type->contains_atomic()) {
 339                /* we don't actually need to do anything. */
 340             } else {
 341                assert(!"Explicit binding not on a sampler, UBO or atomic.");
 342             }
 343          } else if (var->constant_initializer) {
 344             linker::set_uniform_initializer(mem_ctx, prog, var->name,
 345                                             var->type, var->constant_initializer,
 346                                             boolean_true);
 347          }
 348       }
 349    }
 350
 351    ralloc_free(mem_ctx);
 352 }