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 #include "util/string_to_uint_map.h"
  29
  30 /* These functions are put in a "private" namespace instead of being marked
  31  * static so that the unit tests can access them.  See
  32  * http://code.google.com/p/googletest/wiki/AdvancedGuide#Testing_Private_Code
  33  */
  34 namespace linker {
  35
  36 gl_uniform_storage *
  37 get_storage(struct gl_shader_program *prog, const char *name)
  38 {
  39    unsigned id;
  40    if (prog->UniformHash->get(id, name))
  41       return &prog->UniformStorage[id];
  42
  43    assert(!"No uniform storage found!");
  44    return NULL;
  45 }
  46
  47 void
  48 copy_constant_to_storage(union gl_constant_value *storage,
  49                          const ir_constant *val,
  50                          const enum glsl_base_type base_type,
  51                          const unsigned int elements,
  52                          unsigned int boolean_true)
  53 {
  54    for (unsigned int i = 0; i < elements; i++) {
  55       switch (base_type) {
  56       case GLSL_TYPE_UINT:
  57          storage[i].u = val->value.u[i];
  58          break;
  59       case GLSL_TYPE_INT:
  60       case GLSL_TYPE_SAMPLER:
  61          storage[i].i = val->value.i[i];
  62          break;
  63       case GLSL_TYPE_FLOAT:
  64          storage[i].f = val->value.f[i];
  65          break;
  66       case GLSL_TYPE_DOUBLE:
  67          /* XXX need to check on big-endian */
  68          memcpy(&storage[i * 2].u, &val->value.d[i], sizeof(double));
  69          break;
  70       case GLSL_TYPE_BOOL:
  71          storage[i].b = val->value.b[i] ? boolean_true : 0;
  72          break;
  73       case GLSL_TYPE_ARRAY:
  74       case GLSL_TYPE_STRUCT:
  75       case GLSL_TYPE_IMAGE:
  76       case GLSL_TYPE_ATOMIC_UINT:
  77       case GLSL_TYPE_INTERFACE:
  78       case GLSL_TYPE_VOID:
  79       case GLSL_TYPE_SUBROUTINE:
  80       case GLSL_TYPE_FUNCTION:
  81       case GLSL_TYPE_ERROR:
  82          /* All other types should have already been filtered by other
  83           * paths in the caller.
  84           */
  85          assert(!"Should not get here.");
  86          break;
  87       }
  88    }
  89 }
  90
  91 /**
  92  * Initialize an opaque uniform from the value of an explicit binding
  93  * qualifier specified in the shader.  Atomic counters are different because
  94  * they have no storage and should be handled elsewhere.
  95  */
  96 void
  97 set_opaque_binding(void *mem_ctx, gl_shader_program *prog,
  98                    const glsl_type *type, const char *name, int *binding)
  99 {
 100
 101    if (type->is_array() && type->fields.array->is_array()) {
 102       const glsl_type *const element_type = type->fields.array;
 103
 104       for (unsigned int i = 0; i < type->length; i++) {
 105          const char *element_name = ralloc_asprintf(mem_ctx, "%s[%d]", name, i);
 106
 107          set_opaque_binding(mem_ctx, prog, element_type,
 108                             element_name, binding);
 109       }
 110    } else {
 111       struct gl_uniform_storage *const storage = get_storage(prog, name);
 112
 113       if (!storage)
 114          return;
 115
 116       const unsigned elements = MAX2(storage->array_elements, 1);
 117
 118       /* Section 4.4.4 (Opaque-Uniform Layout Qualifiers) of the GLSL 4.20 spec
 119        * says:
 120        *
 121        *     "If the binding identifier is used with an array, the first element
 122        *     of the array takes the specified unit and each subsequent element
 123        *     takes the next consecutive unit."
 124        */
 125       for (unsigned int i = 0; i < elements; i++) {
 126          storage->storage[i].i = (*binding)++;
 127       }
 128
 129       for (int sh = 0; sh < MESA_SHADER_STAGES; sh++) {
 130         gl_linked_shader *shader = prog->_LinkedShaders[sh];
 131
 132          if (shader) {
 133             if (storage->type->base_type == GLSL_TYPE_SAMPLER &&
 134                 storage->opaque[sh].active) {
 135                for (unsigned i = 0; i < elements; i++) {
 136                   const unsigned index = storage->opaque[sh].index + i;
 137                   shader->SamplerUnits[index] = storage->storage[i].i;
 138                }
 139
 140             } else if (storage->type->base_type == GLSL_TYPE_IMAGE &&
 141                     storage->opaque[sh].active) {
 142                for (unsigned i = 0; i < elements; i++) {
 143                   const unsigned index = storage->opaque[sh].index + i;
 144                   if (index >= ARRAY_SIZE(shader->ImageUnits))
 145                      break;
 146                   shader->ImageUnits[index] = storage->storage[i].i;
 147                }
 148             }
 149          }
 150       }
 151    }
 152 }
 153
 154 void
 155 set_block_binding(gl_shader_program *prog, const char *block_name,
 156                   unsigned mode, int binding)
 157 {
 158    unsigned num_blocks = mode == ir_var_uniform ? prog->NumUniformBlocks :
 159       prog->NumShaderStorageBlocks;
 160    struct gl_uniform_block *blks = mode == ir_var_uniform ?
 161       prog->UniformBlocks : prog->ShaderStorageBlocks;
 162
 163    for (unsigned i = 0; i < num_blocks; i++) {
 164       if (!strcmp(blks[i].Name, block_name)) {
 165          blks[i].Binding = binding;
 166          return;
 167       }
 168    }
 169
 170    unreachable("Failed to initialize block binding");
 171 }
 172
 173 void
 174 set_uniform_initializer(void *mem_ctx, gl_shader_program *prog,
 175                         const char *name, const glsl_type *type,
 176                         ir_constant *val, unsigned int boolean_true)
 177 {
 178    const glsl_type *t_without_array = type->without_array();
 179    if (type->is_record()) {
 180       ir_constant *field_constant;
 181
 182       field_constant = (ir_constant *)val->components.get_head();
 183
 184       for (unsigned int i = 0; i < type->length; i++) {
 185          const glsl_type *field_type = type->fields.structure[i].type;
 186          const char *field_name = ralloc_asprintf(mem_ctx, "%s.%s", name,
 187                                             type->fields.structure[i].name);
 188          set_uniform_initializer(mem_ctx, prog, field_name,
 189                                  field_type, field_constant, boolean_true);
 190          field_constant = (ir_constant *)field_constant->next;
 191       }
 192       return;
 193    } else if (t_without_array->is_record() ||
 194               (type->is_array() && type->fields.array->is_array())) {
 195       const glsl_type *const element_type = type->fields.array;
 196
 197       for (unsigned int i = 0; i < type->length; i++) {
 198          const char *element_name = ralloc_asprintf(mem_ctx, "%s[%d]", name, i);
 199
 200          set_uniform_initializer(mem_ctx, prog, element_name,
 201                                  element_type, val->array_elements[i],
 202                                  boolean_true);
 203       }
 204       return;
 205    }
 206
 207    struct gl_uniform_storage *const storage = get_storage(prog, name);
 208
 209    if (!storage)
 210       return;
 211
 212    if (val->type->is_array()) {
 213       const enum glsl_base_type base_type =
 214          val->array_elements[0]->type->base_type;
 215       const unsigned int elements = val->array_elements[0]->type->components();
 216       unsigned int idx = 0;
 217       unsigned dmul = glsl_base_type_is_64bit(base_type) ? 2 : 1;
 218
 219       assert(val->type->length >= storage->array_elements);
 220       for (unsigned int i = 0; i < storage->array_elements; i++) {
 221          copy_constant_to_storage(& storage->storage[idx],
 222                                   val->array_elements[i],
 223                                   base_type,
 224                                   elements,
 225                                   boolean_true);
 226
 227          idx += elements * dmul;
 228       }
 229    } else {
 230       copy_constant_to_storage(storage->storage,
 231                                val,
 232                                val->type->base_type,
 233                                val->type->components(),
 234                                boolean_true);
 235
 236       if (storage->type->is_sampler()) {
 237          for (int sh = 0; sh < MESA_SHADER_STAGES; sh++) {
 238             gl_linked_shader *shader = prog->_LinkedShaders[sh];
 239
 240             if (shader && storage->opaque[sh].active) {
 241                unsigned index = storage->opaque[sh].index;
 242
 243                shader->SamplerUnits[index] = storage->storage[0].i;
 244             }
 245          }
 246       }
 247    }
 248 }
 249 }
 250
 251 void
 252 link_set_uniform_initializers(struct gl_shader_program *prog,
 253                               unsigned int boolean_true)
 254 {
 255    void *mem_ctx = NULL;
 256
 257    for (unsigned int i = 0; i < MESA_SHADER_STAGES; i++) {
 258       struct gl_linked_shader *shader = prog->_LinkedShaders[i];
 259
 260       if (shader == NULL)
 261          continue;
 262
 263       foreach_in_list(ir_instruction, node, shader->ir) {
 264          ir_variable *const var = node->as_variable();
 265
 266          if (!var || (var->data.mode != ir_var_uniform &&
 267              var->data.mode != ir_var_shader_storage))
 268             continue;
 269
 270          if (!mem_ctx)
 271             mem_ctx = ralloc_context(NULL);
 272
 273          if (var->data.explicit_binding) {
 274             const glsl_type *const type = var->type;
 275
 276             if (type->without_array()->is_sampler() ||
 277                 type->without_array()->is_image()) {
 278                int binding = var->data.binding;
 279                linker::set_opaque_binding(mem_ctx, prog, var->type,
 280                                           var->name, &binding);
 281             } else if (var->is_in_buffer_block()) {
 282                const glsl_type *const iface_type = var->get_interface_type();
 283
 284                /* If the variable is an array and it is an interface instance,
 285                 * we need to set the binding for each array element.  Just
 286                 * checking that the variable is an array is not sufficient.
 287                 * The variable could be an array element of a uniform block
 288                 * that lacks an instance name.  For example:
 289                 *
 290                 *     uniform U {
 291                 *         float f[4];
 292                 *     };
 293                 *
 294                 * In this case "f" would pass is_in_buffer_block (above) and
 295                 * type->is_array(), but it will fail is_interface_instance().
 296                 */
 297                if (var->is_interface_instance() && var->type->is_array()) {
 298                   for (unsigned i = 0; i < var->type->length; i++) {
 299                      const char *name =
 300                         ralloc_asprintf(mem_ctx, "%s[%u]", iface_type->name, i);
 301
 302                      /* Section 4.4.3 (Uniform Block Layout Qualifiers) of the
 303                       * GLSL 4.20 spec says:
 304                       *
 305                       *     "If the binding identifier is used with a uniform
 306                       *     block instanced as an array then the first element
 307                       *     of the array takes the specified block binding and
 308                       *     each subsequent element takes the next consecutive
 309                       *     uniform block binding point."
 310                       */
 311                      linker::set_block_binding(prog, name, var->data.mode,
 312                                                var->data.binding + i);
 313                   }
 314                } else {
 315                   linker::set_block_binding(prog, iface_type->name,
 316                                             var->data.mode,
 317                                             var->data.binding);
 318                }
 319             } else if (type->contains_atomic()) {
 320                /* we don't actually need to do anything. */
 321             } else {
 322                assert(!"Explicit binding not on a sampler, UBO or atomic.");
 323             }
 324          } else if (var->constant_initializer) {
 325             linker::set_uniform_initializer(mem_ctx, prog, var->name,
 326                                             var->type, var->constant_initializer,
 327                                             boolean_true);
 328          }
 329       }
 330    }
 331
 332    ralloc_free(mem_ctx);
 333 }