Adding GetStreamInfo functionality (and passing corresponding unit test).

command_buffer/common/cross/gapi_interface.h

 /*
  * Copyright 2009, Google Inc.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
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   //   passed, such as invalid parameter ID, or unsufficient data size,
   //   BufferSyncInterface::PARSE_NO_ERROR otherwise. Note that
   //   BufferSyncInterface::PARSE_NO_ERROR will be returned if the structure
   //   itself fits, not necessarily the names. To make sure all the information
   //   is available, the caller should compare the returned size member of the
   //   effect_param::Desc structure to the size parameter passed in.
   virtual ParseError GetParamDesc(ResourceID id,
                                   unsigned int size,
                                   void *data) = 0;
 
+  // Gets the number of input streams for an effect, returning it in a memory
+  // buffer as a Uint32.
+  // Parameters:
+  //   id: the resource ID of the effect.
+  //   size: the size of the data buffer. Must be at least 4 (the size of the
+  //   Uint32).
+  //   data: the buffer receiving the data.
+  // Returns:
+  //   BufferSyncInterface::PARSE_INVALID_ARGUMENTS if invalid arguments are
+  //   passed, BufferSyncInterface::PARSE_NO_ERROR otherwise.
+  virtual ParseError GetStreamCount(ResourceID id,
+                                    unsigned int size,
+                                    void *data) = 0;
+
+  // Gets the stream semantics, storing them in the data buffer. The stream
+  // is described by an effect_stream::Desc structure which contains a
+  // semantic type and a semantic index.
+  // Parameters:
+  //   id: the resource ID of the effect.
+  //   index: which stream semantic to get
+  //   size: the size of the data buffer. Must be at least 8 (the size of two
+  //   Uint32).
+  //   data: the buffer receiving the data.
+  virtual ParseError GetStreamDesc(ResourceID id,
+                                   unsigned int index,
+                                   unsigned int size,
+                                   void *data) = 0;
+
   // Creates a 2D texture resource.
   // Parameters:
   //   id: the resource ID of the texture.
   //   width: the texture width. Must be positive.
   //   height: the texture height. Must be positive.
   //   levels: the number of mipmap levels in the texture, or 0 to use the
   //     maximum.
   //   format: the format of the texels in the texture.
   //   flags: the texture flags, as a combination of texture::Flags.
   // Returns:
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                            BlendFunc alpha_dst_func) = 0;
 
   // Sets the blending color.
   virtual void SetBlendingColor(const RGBA &color) = 0;
 };
 
 }  // namespace command_buffer
 }  // namespace o3d
 
 #endif  // O3D_COMMAND_BUFFER_COMMON_CROSS_GAPI_INTERFACE_H__