Implements glGetVertexAttribPointerv

gpu/command_buffer/common/gles2_cmd_format.h

 // 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.
 
 // This file defines the GLES2 command buffer commands.
 
 #ifndef GPU_COMMAND_BUFFER_COMMON_GLES2_CMD_FORMAT_H_
 #define GPU_COMMAND_BUFFER_COMMON_GLES2_CMD_FORMAT_H_
 
 // This is here because service side code must include the system's version of
@@ skipping 14 matching lines @@
 #include "gpu/command_buffer/common/types.h"
 #include "gpu/command_buffer/common/bitfield_helpers.h"
 #include "gpu/command_buffer/common/cmd_buffer_common.h"
 #include "gpu/command_buffer/common/gles2_cmd_ids.h"
 
 namespace gpu {
 namespace gles2 {
 
 #pragma pack(push, 1)
 
+// Used for some glGetXXX commands that return a result through a pointer. We
+// need to know if the command succeeded or not and the size of the result. If
+// the command failed its result size will 0.
+struct SizedResult {
+  template <typename T>
+  T GetDataAs() {
+    return static_cast<T>(static_cast<void*>(&data));
+  }
+  uint32 size;  // in bytes.
+  int32 data;  // this is just here to get an offset.
+};
+
 #include "gpu/command_buffer/common/gles2_cmd_format_autogen.h"
 
 // These are hand written commands.
 // TODO(gman): Attempt to make these auto-generated.
 
 struct GetAttribLocation {
   typedef GetAttribLocation ValueType;
   static const CommandId kCmdId = kGetAttribLocation;
   static const cmd::ArgFlags kArgFlags = cmd::kFixed;
 
@@ skipping 233 matching lines @@
 COMPILE_ASSERT(offsetof(GetUniformLocationImmediate, data_size) == 16,
                OffsetOf_GetUniformLocationImmediate_data_size_not_16);
 
 #pragma pack(pop)
 
 }  // namespace gles2
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_COMMON_GLES2_CMD_FORMAT_H_