src/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->NumUniformBlocks; i++) {
  52       if (!strcmp(shProg->UniformBlocks[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_FUNCTION:
  92       case GLSL_TYPE_VOID:
  93       case GLSL_TYPE_ERROR:
  94          /* All other types should have already been filtered by other
  95           * paths in the caller.
  96           */
  97          assert(!"Should not get here.");
  98          break;
  99       }
 100    }
 101 }
 102
 103 void
 104 set_sampler_binding(gl_shader_program *prog, const char *name, int binding)
 105 {
 106    struct gl_uniform_storage *const storage =
 107       get_storage(prog->UniformStorage, prog->NumUniformStorage, name);
 108
 109    if (storage == NULL) {
 110       assert(storage != NULL);
 111       return;
 112    }
 113
 114    const unsigned elements = MAX2(storage->array_elements, 1);
 115
 116    /* Section 4.4.4 (Opaque-Uniform Layout Qualifiers) of the GLSL 4.20 spec
 117     * says:
 118     *
 119     *     "If the binding identifier is used with an array, the first element
 120     *     of the array takes the specified unit and each subsequent element
 121     *     takes the next consecutive unit."
 122     */
 123    for (unsigned int i = 0; i < elements; i++) {
 124       storage->storage[i].i = binding + i;
 125    }
 126
 127    for (int sh = 0; sh < MESA_SHADER_STAGES; sh++) {
 128       gl_shader *shader = prog->_LinkedShaders[sh];
 129
 130       if (shader && storage->sampler[sh].active) {
 131          for (unsigned i = 0; i < elements; i++) {
 132             unsigned index = storage->sampler[sh].index + i;
 133
 134             shader->SamplerUnits[index] = storage->storage[i].i;
 135          }
 136       }
 137    }
 138
 139    storage->initialized = true;
 140 }
 141
 142 void
 143 set_block_binding(gl_shader_program *prog, const char *block_name, int binding)
 144 {
 145    const unsigned block_index = get_uniform_block_index(prog, block_name);
 146
 147    if (block_index == GL_INVALID_INDEX) {
 148       assert(block_index != GL_INVALID_INDEX);
 149       return;
 150    }
 151
 152       /* This is a field of a UBO.  val is the binding index. */
 153       for (int i = 0; i < MESA_SHADER_STAGES; i++) {
 154          int stage_index = prog->UniformBlockStageIndex[i][block_index];
 155
 156          if (stage_index != -1) {
 157             struct gl_shader *sh = prog->_LinkedShaders[i];
 158             sh->UniformBlocks[stage_index].Binding = binding;
 159          }
 160       }
 161 }
 162
 163 void
 164 set_uniform_initializer(void *mem_ctx, gl_shader_program *prog,
 165                         const char *name, const glsl_type *type,
 166                         ir_constant *val, unsigned int boolean_true)
 167 {
 168    if (type->is_record()) {
 169       ir_constant *field_constant;
 170
 171       field_constant = (ir_constant *)val->components.get_head();
 172
 173       for (unsigned int i = 0; i < type->length; i++) {
 174          const glsl_type *field_type = type->fields.structure[i].type;
 175          const char *field_name = ralloc_asprintf(mem_ctx, "%s.%s", name,
 176                                             type->fields.structure[i].name);
 177          set_uniform_initializer(mem_ctx, prog, field_name,
 178                                  field_type, field_constant, boolean_true);
 179          field_constant = (ir_constant *)field_constant->next;
 180       }
 181       return;
 182    } else if (type->is_array() && type->fields.array->is_record()) {
 183       const glsl_type *const element_type = type->fields.array;
 184
 185       for (unsigned int i = 0; i < type->length; i++) {
 186          const char *element_name = ralloc_asprintf(mem_ctx, "%s[%d]", name, i);
 187
 188          set_uniform_initializer(mem_ctx, prog, element_name,
 189                                  element_type, val->array_elements[i],
 190                                  boolean_true);
 191       }
 192       return;
 193    }
 194
 195    struct gl_uniform_storage *const storage =
 196       get_storage(prog->UniformStorage,
 197                   prog->NumUniformStorage,
 198                   name);
 199    if (storage == NULL) {
 200       assert(storage != NULL);
 201       return;
 202    }
 203
 204    if (val->type->is_array()) {
 205       const enum glsl_base_type base_type =
 206          val->array_elements[0]->type->base_type;
 207       const unsigned int elements = val->array_elements[0]->type->components();
 208       unsigned int idx = 0;
 209       unsigned dmul = (base_type == GLSL_TYPE_DOUBLE) ? 2 : 1;
 210
 211       assert(val->type->length >= storage->array_elements);
 212       for (unsigned int i = 0; i < storage->array_elements; i++) {
 213          copy_constant_to_storage(& storage->storage[idx],
 214                                   val->array_elements[i],
 215                                   base_type,
 216                                   elements,
 217                                   boolean_true);
 218
 219          idx += elements * dmul;
 220       }
 221    } else {
 222       copy_constant_to_storage(storage->storage,
 223                                val,
 224                                val->type->base_type,
 225                                val->type->components(),
 226                                boolean_true);
 227
 228       if (storage->type->is_sampler()) {
 229          for (int sh = 0; sh < MESA_SHADER_STAGES; sh++) {
 230             gl_shader *shader = prog->_LinkedShaders[sh];
 231
 232             if (shader && storage->sampler[sh].active) {
 233                unsigned index = storage->sampler[sh].index;
 234
 235                shader->SamplerUnits[index] = storage->storage[0].i;
 236             }
 237          }
 238       }
 239    }
 240
 241    storage->initialized = true;
 242 }
 243 }
 244
 245 void
 246 link_set_uniform_initializers(struct gl_shader_program *prog,
 247                               unsigned int boolean_true)
 248 {
 249    void *mem_ctx = NULL;
 250
 251    for (unsigned int i = 0; i < MESA_SHADER_STAGES; i++) {
 252       struct gl_shader *shader = prog->_LinkedShaders[i];
 253
 254       if (shader == NULL)
 255          continue;
 256
 257       foreach_in_list(ir_instruction, node, shader->ir) {
 258          ir_variable *const var = node->as_variable();
 259
 260          if (!var || var->data.mode != ir_var_uniform)
 261             continue;
 262
 263          if (!mem_ctx)
 264             mem_ctx = ralloc_context(NULL);
 265
 266          if (var->data.explicit_binding) {
 267             const glsl_type *const type = var->type;
 268
 269             if (type->without_array()->is_sampler()) {
 270                linker::set_sampler_binding(prog, var->name, var->data.binding);
 271             } else if (var->is_in_uniform_block()) {
 272                const glsl_type *const iface_type = var->get_interface_type();
 273
 274                /* If the variable is an array and it is an interface instance,
 275                 * we need to set the binding for each array element.  Just
 276                 * checking that the variable is an array is not sufficient.
 277                 * The variable could be an array element of a uniform block
 278                 * that lacks an instance name.  For example:
 279                 *
 280                 *     uniform U {
 281                 *         float f[4];
 282                 *     };
 283                 *
 284                 * In this case "f" would pass is_in_uniform_block (above) and
 285                 * type->is_array(), but it will fail is_interface_instance().
 286                 */
 287                if (var->is_interface_instance() && var->type->is_array()) {
 288                   for (unsigned i = 0; i < var->type->length; i++) {
 289                      const char *name =
 290                         ralloc_asprintf(mem_ctx, "%s[%u]", iface_type->name, i);
 291
 292                      /* Section 4.4.3 (Uniform Block Layout Qualifiers) of the
 293                       * GLSL 4.20 spec says:
 294                       *
 295                       *     "If the binding identifier is used with a uniform
 296                       *     block instanced as an array then the first element
 297                       *     of the array takes the specified block binding and
 298                       *     each subsequent element takes the next consecutive
 299                       *     uniform block binding point."
 300                       */
 301                      linker::set_block_binding(prog, name,
 302                                                var->data.binding + i);
 303                   }
 304                } else {
 305                   linker::set_block_binding(prog, iface_type->name,
 306                                             var->data.binding);
 307                }
 308             } else if (type->contains_atomic()) {
 309                /* we don't actually need to do anything. */
 310             } else {
 311                assert(!"Explicit binding not on a sampler, UBO or atomic.");
 312             }
 313          } else if (var->constant_value) {
 314             linker::set_uniform_initializer(mem_ctx, prog, var->name,
 315                                             var->type, var->constant_value,
 316                                             boolean_true);
 317          }
 318       }
 319    }
 320
 321    ralloc_free(mem_ctx);
 322 }