gpu/command_buffer/common/mailbox.h

   1 // Copyright 2013 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 #ifndef GPU_COMMAND_BUFFER_MAILBOX_H_
   6 #define GPU_COMMAND_BUFFER_MAILBOX_H_
   7
   8 #include <stdint.h>
   9 #include <string.h>
  10
  11 #include "gpu/gpu_export.h"
  12
  13 // From gl2/gl2ext.h.
  14 #ifndef GL_MAILBOX_SIZE_CHROMIUM
  15 #define GL_MAILBOX_SIZE_CHROMIUM 64
  16 #endif
  17
  18 namespace gpu {
  19
  20 struct GPU_EXPORT Mailbox {
  21   using Name = int8_t[GL_MAILBOX_SIZE_CHROMIUM];
  22
  23   Mailbox();
  24   bool IsZero() const;
  25   void SetZero();
  26   void SetName(const int8_t* name);
  27
  28   // Generate a unique unguessable mailbox name.
  29   static Mailbox Generate();
  30
  31   // Verify that the mailbox was created through Mailbox::Generate. This only
  32   // works in Debug (always returns true in Release). This is not a secure
  33   // check, only to catch bugs where clients forgot to call Mailbox::Generate.
  34   bool Verify() const;
  35
  36   Name name;
  37
  38   bool operator<(const Mailbox& other) const {
  39     return memcmp(this, &other, sizeof other) < 0;
  40   }
  41   bool operator==(const Mailbox& other) const {
  42     return memcmp(this, &other, sizeof other) == 0;
  43   }
  44   bool operator!=(const Mailbox& other) const {
  45     return !operator==(other);
  46   }
  47 };
  48
  49 }  // namespace gpu
  50
  51 #endif  // GPU_COMMAND_BUFFER_MAILBOX_H_
  52