Adds MapBufferSubData and MapTexSubImage2D....

gpu/command_buffer/client/mapped_memory.cc

+// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "gpu/command_buffer/client/mapped_memory.h"
+#include "gpu/command_buffer/client/cmd_buffer_helper.h"
+
+namespace gpu {
+
+MemoryChunk::MemoryChunk(
+    int32 shm_id, gpu::Buffer shm, CommandBufferHelper* helper)
+    : shm_id_(shm_id),
+      shm_(shm),
+      allocator_(shm.size, helper, shm.ptr) {
+}
+
+void* MappedMemoryManager::Alloc(
+    unsigned int size, int32* shm_id, unsigned int* shm_offset) {
+  DCHECK(shm_id);
+  DCHECK(shm_offset);
+  // See if any of the chucks can satisfy this request.
+  for (size_t ii = 0; ii < chunks_.size(); ++ii) {
+    MemoryChunk* chunk = chunks_[ii].get();
+    chunk->FreeUnused();
+    if (chunk->GetLargestFreeSizeWithoutWaiting() >= size) {
+      void* mem = chunk->Alloc(size);
+      DCHECK(mem);
+      *shm_id = chunk->shm_id();
+      *shm_offset = chunk->GetOffset(mem);
+      return mem;
+    }
+  }
+
+  // Make a new chunk to satisfy the request.
+  CommandBuffer* cmd_buf = helper_->command_buffer();
+  int32 id = cmd_buf->CreateTransferBuffer(size);
+  if (id == -1) {
+    return NULL;
+  }
+  gpu::Buffer shm = cmd_buf->GetTransferBuffer(id);
+  MemoryChunk::Ref mc(new MemoryChunk(id, shm, helper_));
+  chunks_.push_back(mc);
+  void* mem = mc->Alloc(size);
+  DCHECK(mem);
+  *shm_id = mc->shm_id();
+  *shm_offset = mc->GetOffset(mem);
+  return mem;
+}
+
+void MappedMemoryManager::Free(void* pointer) {
+  for (size_t ii = 0; ii < chunks_.size(); ++ii) {
+    MemoryChunk* chunk = chunks_[ii].get();
+    if (chunk->IsInChunk(pointer)) {
+      chunk->Free(pointer);
+      return;
+    }
+  }
+  NOTREACHED();
+}
+
+void MappedMemoryManager::FreePendingToken(void* pointer, int32 token) {
+  for (size_t ii = 0; ii < chunks_.size(); ++ii) {
+    MemoryChunk* chunk = chunks_[ii].get();
+    if (chunk->IsInChunk(pointer)) {
+      chunk->FreePendingToken(pointer, token);
+      return;
+    }
+  }
+  NOTREACHED();
+}
+
+}  // namespace gpu
+
+
+