gpu/command_buffer/client/share_group.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "gpu/command_buffer/client/share_group.h"
   6
   7 #include <stack>
   8 #include <vector>
   9 #include "base/basictypes.h"
  10 #include "base/logging.h"
  11 #include "base/synchronization/lock.h"
  12 #include "gpu/command_buffer/client/gles2_cmd_helper.h"
  13 #include "gpu/command_buffer/client/gles2_implementation.h"
  14 #include "gpu/command_buffer/client/program_info_manager.h"
  15 #include "gpu/command_buffer/common/id_allocator.h"
  16
  17 namespace gpu {
  18 namespace gles2 {
  19
  20 ShareGroupContextData::IdHandlerData::IdHandlerData() : flush_generation_(0) {}
  21 ShareGroupContextData::IdHandlerData::~IdHandlerData() {}
  22
  23 static_assert(gpu::kInvalidResource == 0,
  24               "GL expects kInvalidResource to be 0");
  25
  26 // The standard id handler.
  27 class IdHandler : public IdHandlerInterface {
  28  public:
  29   IdHandler() { }
  30   ~IdHandler() override {}
  31
  32   // Overridden from IdHandlerInterface.
  33   void MakeIds(GLES2Implementation* /* gl_impl */,
  34                GLuint id_offset,
  35                GLsizei n,
  36                GLuint* ids) override {
  37     base::AutoLock auto_lock(lock_);
  38     if (id_offset == 0) {
  39       for (GLsizei ii = 0; ii < n; ++ii) {
  40         ids[ii] = id_allocator_.AllocateID();
  41       }
  42     } else {
  43       for (GLsizei ii = 0; ii < n; ++ii) {
  44         ids[ii] = id_allocator_.AllocateIDAtOrAbove(id_offset);
  45         id_offset = ids[ii] + 1;
  46       }
  47     }
  48   }
  49
  50   // Overridden from IdHandlerInterface.
  51   bool FreeIds(GLES2Implementation* gl_impl,
  52                GLsizei n,
  53                const GLuint* ids,
  54                DeleteFn delete_fn) override {
  55     base::AutoLock auto_lock(lock_);
  56
  57     for (GLsizei ii = 0; ii < n; ++ii) {
  58       id_allocator_.FreeID(ids[ii]);
  59     }
  60
  61     (gl_impl->*delete_fn)(n, ids);
  62     // We need to ensure that the delete call is evaluated on the service side
  63     // before any other contexts issue commands using these client ids.
  64     gl_impl->helper()->CommandBufferHelper::OrderingBarrier();
  65     return true;
  66   }
  67
  68   // Overridden from IdHandlerInterface.
  69   bool MarkAsUsedForBind(GLES2Implementation* gl_impl,
  70                          GLenum target,
  71                          GLuint id,
  72                          BindFn bind_fn) override {
  73     base::AutoLock auto_lock(lock_);
  74     bool result = id ? id_allocator_.MarkAsUsed(id) : true;
  75     (gl_impl->*bind_fn)(target, id);
  76     return result;
  77   }
  78   bool MarkAsUsedForBind(GLES2Implementation* gl_impl,
  79                          GLenum target,
  80                          GLuint index,
  81                          GLuint id,
  82                          BindIndexedFn bind_fn) override {
  83     base::AutoLock auto_lock(lock_);
  84     bool result = id ? id_allocator_.MarkAsUsed(id) : true;
  85     (gl_impl->*bind_fn)(target, index, id);
  86     return result;
  87   }
  88   bool MarkAsUsedForBind(GLES2Implementation* gl_impl,
  89                          GLenum target,
  90                          GLuint index,
  91                          GLuint id,
  92                          GLintptr offset,
  93                          GLsizeiptr size,
  94                          BindIndexedRangeFn bind_fn) override {
  95     base::AutoLock auto_lock(lock_);
  96     bool result = id ? id_allocator_.MarkAsUsed(id) : true;
  97     (gl_impl->*bind_fn)(target, index, id, offset, size);
  98     return result;
  99   }
 100
 101   void FreeContext(GLES2Implementation* gl_impl) override {}
 102
 103  private:
 104   base::Lock lock_;
 105   IdAllocator id_allocator_;
 106 };
 107
 108 // An id handler that requires Gen before Bind.
 109 class StrictIdHandler : public IdHandlerInterface {
 110  public:
 111   explicit StrictIdHandler(int id_namespace) : id_namespace_(id_namespace) {}
 112   ~StrictIdHandler() override {}
 113
 114   // Overridden from IdHandler.
 115   void MakeIds(GLES2Implementation* gl_impl,
 116                GLuint /* id_offset */,
 117                GLsizei n,
 118                GLuint* ids) override {
 119     base::AutoLock auto_lock(lock_);
 120
 121     // Collect pending FreeIds from other flush_generation.
 122     CollectPendingFreeIds(gl_impl);
 123
 124     for (GLsizei ii = 0; ii < n; ++ii) {
 125       if (!free_ids_.empty()) {
 126         // Allocate a previously freed Id.
 127         ids[ii] = free_ids_.top();
 128         free_ids_.pop();
 129
 130         // Record kIdInUse state.
 131         DCHECK(id_states_[ids[ii] - 1] == kIdFree);
 132         id_states_[ids[ii] - 1] = kIdInUse;
 133       } else {
 134         // Allocate a new Id.
 135         id_states_.push_back(kIdInUse);
 136         ids[ii] = id_states_.size();
 137       }
 138     }
 139   }
 140
 141   // Overridden from IdHandler.
 142   bool FreeIds(GLES2Implementation* gl_impl,
 143                GLsizei n,
 144                const GLuint* ids,
 145                DeleteFn delete_fn) override {
 146     // Delete stub must run before CollectPendingFreeIds.
 147     (gl_impl->*delete_fn)(n, ids);
 148
 149     {
 150       base::AutoLock auto_lock(lock_);
 151
 152       // Collect pending FreeIds from other flush_generation.
 153       CollectPendingFreeIds(gl_impl);
 154
 155       // Save Ids to free in a later flush_generation.
 156       ShareGroupContextData::IdHandlerData* ctxt_data =
 157           gl_impl->share_group_context_data()->id_handler_data(id_namespace_);
 158
 159       for (GLsizei ii = 0; ii < n; ++ii) {
 160         GLuint id = ids[ii];
 161         if (id != 0) {
 162           // Save freed Id for later.
 163           DCHECK(id_states_[id - 1] == kIdInUse);
 164           id_states_[id - 1] = kIdPendingFree;
 165           ctxt_data->freed_ids_.push_back(id);
 166         }
 167       }
 168     }
 169
 170     return true;
 171   }
 172
 173   // Overridden from IdHandler.
 174   bool MarkAsUsedForBind(GLES2Implementation* gl_impl,
 175                          GLenum target,
 176                          GLuint id,
 177                          BindFn bind_fn) override {
 178 #ifndef NDEBUG
 179     if (id != 0) {
 180       base::AutoLock auto_lock(lock_);
 181       DCHECK(id_states_[id - 1] == kIdInUse);
 182     }
 183 #endif
 184     // StrictIdHandler is used if |bind_generates_resource| is false. In that
 185     // case, |bind_fn| will not use Flush() after helper->Bind*(), so it is OK
 186     // to call |bind_fn| without holding the lock.
 187     (gl_impl->*bind_fn)(target, id);
 188     return true;
 189   }
 190   bool MarkAsUsedForBind(GLES2Implementation* gl_impl,
 191                          GLenum target,
 192                          GLuint index,
 193                          GLuint id,
 194                          BindIndexedFn bind_fn) override {
 195 #ifndef NDEBUG
 196     if (id != 0) {
 197       base::AutoLock auto_lock(lock_);
 198       DCHECK(id_states_[id - 1] == kIdInUse);
 199     }
 200 #endif
 201     // StrictIdHandler is used if |bind_generates_resource| is false. In that
 202     // case, |bind_fn| will not use Flush() after helper->Bind*(), so it is OK
 203     // to call |bind_fn| without holding the lock.
 204     (gl_impl->*bind_fn)(target, index, id);
 205     return true;
 206   }
 207   bool MarkAsUsedForBind(GLES2Implementation* gl_impl,
 208                          GLenum target,
 209                          GLuint index,
 210                          GLuint id,
 211                          GLintptr offset,
 212                          GLsizeiptr size,
 213                          BindIndexedRangeFn bind_fn) override {
 214 #ifndef NDEBUG
 215     if (id != 0) {
 216       base::AutoLock auto_lock(lock_);
 217       DCHECK(id_states_[id - 1] == kIdInUse);
 218     }
 219 #endif
 220     // StrictIdHandler is used if |bind_generates_resource| is false. In that
 221     // case, |bind_fn| will not use Flush() after helper->Bind*(), so it is OK
 222     // to call |bind_fn| without holding the lock.
 223     (gl_impl->*bind_fn)(target, index, id, offset, size);
 224     return true;
 225   }
 226
 227   // Overridden from IdHandlerInterface.
 228   void FreeContext(GLES2Implementation* gl_impl) override {
 229     base::AutoLock auto_lock(lock_);
 230     CollectPendingFreeIds(gl_impl);
 231   }
 232
 233  private:
 234   enum IdState { kIdFree, kIdPendingFree, kIdInUse };
 235
 236   void CollectPendingFreeIds(GLES2Implementation* gl_impl) {
 237     uint32 flush_generation = gl_impl->helper()->flush_generation();
 238     ShareGroupContextData::IdHandlerData* ctxt_data =
 239         gl_impl->share_group_context_data()->id_handler_data(id_namespace_);
 240
 241     if (ctxt_data->flush_generation_ != flush_generation) {
 242       ctxt_data->flush_generation_ = flush_generation;
 243       for (uint32 ii = 0; ii < ctxt_data->freed_ids_.size(); ++ii) {
 244         const GLuint id = ctxt_data->freed_ids_[ii];
 245         DCHECK(id_states_[id - 1] == kIdPendingFree);
 246         id_states_[id - 1] = kIdFree;
 247         free_ids_.push(id);
 248       }
 249       ctxt_data->freed_ids_.clear();
 250     }
 251   }
 252
 253   int id_namespace_;
 254
 255   base::Lock lock_;
 256   std::vector<uint8> id_states_;
 257   std::stack<uint32> free_ids_;
 258 };
 259
 260 // An id handler for ids that are never reused.
 261 class NonReusedIdHandler : public IdHandlerInterface {
 262  public:
 263   NonReusedIdHandler() : last_id_(0) {}
 264   ~NonReusedIdHandler() override {}
 265
 266   // Overridden from IdHandlerInterface.
 267   void MakeIds(GLES2Implementation* /* gl_impl */,
 268                GLuint id_offset,
 269                GLsizei n,
 270                GLuint* ids) override {
 271     base::AutoLock auto_lock(lock_);
 272     for (GLsizei ii = 0; ii < n; ++ii) {
 273       ids[ii] = ++last_id_ + id_offset;
 274     }
 275   }
 276
 277   // Overridden from IdHandlerInterface.
 278   bool FreeIds(GLES2Implementation* gl_impl,
 279                GLsizei n,
 280                const GLuint* ids,
 281                DeleteFn delete_fn) override {
 282     // Ids are never freed.
 283     (gl_impl->*delete_fn)(n, ids);
 284     return true;
 285   }
 286
 287   // Overridden from IdHandlerInterface.
 288   bool MarkAsUsedForBind(GLES2Implementation* /* gl_impl */,
 289                          GLenum /* target */,
 290                          GLuint /* id */,
 291                          BindFn /* bind_fn */) override {
 292     // This is only used for Shaders and Programs which have no bind.
 293     return false;
 294   }
 295   bool MarkAsUsedForBind(GLES2Implementation* /* gl_impl */,
 296                          GLenum /* target */,
 297                          GLuint /* index */,
 298                          GLuint /* id */,
 299                          BindIndexedFn /* bind_fn */) override {
 300     // This is only used for Shaders and Programs which have no bind.
 301     return false;
 302   }
 303   bool MarkAsUsedForBind(GLES2Implementation* /* gl_impl */,
 304                          GLenum /* target */,
 305                          GLuint /* index */,
 306                          GLuint /* id */,
 307                          GLintptr /* offset */,
 308                          GLsizeiptr /* size */,
 309                          BindIndexedRangeFn /* bind_fn */) override {
 310     // This is only used for Shaders and Programs which have no bind.
 311     return false;
 312   }
 313
 314   void FreeContext(GLES2Implementation* gl_impl) override {}
 315
 316  private:
 317   base::Lock lock_;
 318   GLuint last_id_;
 319 };
 320
 321 class RangeIdHandler : public RangeIdHandlerInterface {
 322  public:
 323   RangeIdHandler() {}
 324
 325   void MakeIdRange(GLES2Implementation* /*gl_impl*/,
 326                    GLsizei n,
 327                    GLuint* first_id) override {
 328     base::AutoLock auto_lock(lock_);
 329     *first_id = id_allocator_.AllocateIDRange(n);
 330   }
 331
 332   void FreeIdRange(GLES2Implementation* gl_impl,
 333                    const GLuint first_id,
 334                    GLsizei range,
 335                    DeleteRangeFn delete_fn) override {
 336     base::AutoLock auto_lock(lock_);
 337     DCHECK(range > 0);
 338     id_allocator_.FreeIDRange(first_id, range);
 339     (gl_impl->*delete_fn)(first_id, range);
 340     gl_impl->helper()->CommandBufferHelper::OrderingBarrier();
 341   }
 342
 343   void FreeContext(GLES2Implementation* gl_impl) override {}
 344
 345  private:
 346   base::Lock lock_;
 347   IdAllocator id_allocator_;
 348 };
 349
 350 ShareGroup::ShareGroup(bool bind_generates_resource)
 351     : bind_generates_resource_(bind_generates_resource) {
 352   if (bind_generates_resource) {
 353     for (int i = 0; i < id_namespaces::kNumIdNamespaces; ++i) {
 354       if (i == id_namespaces::kProgramsAndShaders) {
 355         id_handlers_[i].reset(new NonReusedIdHandler());
 356       } else {
 357         id_handlers_[i].reset(new IdHandler());
 358       }
 359     }
 360   } else {
 361     for (int i = 0; i < id_namespaces::kNumIdNamespaces; ++i) {
 362       if (i == id_namespaces::kProgramsAndShaders) {
 363         id_handlers_[i].reset(new NonReusedIdHandler());
 364       } else {
 365         id_handlers_[i].reset(new StrictIdHandler(i));
 366       }
 367     }
 368   }
 369   program_info_manager_.reset(new ProgramInfoManager);
 370   for (auto& range_id_handler : range_id_handlers_) {
 371     range_id_handler.reset(new RangeIdHandler());
 372   }
 373 }
 374
 375 void ShareGroup::set_program_info_manager(ProgramInfoManager* manager) {
 376   program_info_manager_.reset(manager);
 377 }
 378
 379 ShareGroup::~ShareGroup() {}
 380
 381 }  // namespace gles2
 382 }  // namespace gpu