Add commands Jump, Call and Return...

gpu/command_buffer/service/common_decoder.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.
 
 #ifndef GPU_COMMAND_BUFFER_SERVICE_COMMON_DECODER_H_
 #define GPU_COMMAND_BUFFER_SERVICE_COMMON_DECODER_H_
 
 #include <map>
+#include <stack>
 #include "base/linked_ptr.h"
 #include "base/scoped_ptr.h"
 #include "gpu/command_buffer/service/cmd_parser.h"
 
 namespace gpu {
 
 class CommandBufferEngine;
 
 // This class is a helper base class for implementing the common parts of the
 // o3d/gl2 command buffer decoder.
 class CommonDecoder : public AsyncAPIInterface {
  public:
   typedef parse_error::ParseError ParseError;
 
+  static const unsigned int kMaxStackDepth = 32;
+
   // A bucket is a buffer to help collect memory across a command buffer. When
   // creating a command buffer implementation of an existing API, sometimes that
   // API has functions that take a pointer to data.  A good example is OpenGL's
   // glBufferData. Because the data is separated between client and service,
   // there are 2 ways to get this data across. 1 is to put all the data in
   // shared memory. The problem with this is the data can be arbitarily large
   // and the host OS may not support that much shared memory. Another solution
   // is to shuffle memory across a little bit at a time, collecting it on the
   // service side and when it is all there then call glBufferData. Buckets
   // implement this second solution. Using the common commands, SetBucketSize,
@@ skipping 103 matching lines @@
   // typesafe way.
   #define COMMON_COMMAND_BUFFER_CMD_OP(name)             \
      parse_error::ParseError Handle ## name(             \
        uint32 immediate_data_size,                       \
        const cmd::name& args);                           \
 
   COMMON_COMMAND_BUFFER_CMDS(COMMON_COMMAND_BUFFER_CMD_OP)
 
   #undef COMMON_COMMAND_BUFFER_CMD_OP
 
+  // Pushes an address on the call stack.
+  bool PushAddress(uint32 offset);
+
   CommandBufferEngine* engine_;
 
   typedef std::map<uint32, linked_ptr<Bucket> > BucketMap;
   BucketMap buckets_;
+
+  // The value put on the call stack.
+  struct CommandAddress {
+    explicit CommandAddress(uint32 _offset)
+        : offset(_offset) {
+    }
+
+    uint32 offset;
+  };
+  std::stack<CommandAddress> call_stack_;
 };
 
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_COMMON_DECODER_H_