Adding GetStreamInfo functionality (and passing corresponding unit test).

command_buffer/client/cross/effect_helper.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.
@@ skipping 41 matching lines @@
   struct EffectParamDesc {
     ResourceID id;                     // The resource ID for the param.
     String name;                       // The name of the param.
     String semantic;                   // The semantic of the param.
     effect_param::DataType data_type;  // The data type of a param.
     unsigned int data_size;            // The size of the data for a param.
     unsigned int cmd_desc_size;        // The size of the effect_param::Desc
                                        // structure (counting strings) for a
                                        // param.
   };
+  struct EffectStreamDesc {
+    vertex_struct::Semantic semantic;  // The semantic enum type.
+    unsigned int semantic_index;
+  };
 
   EffectHelper(CommandBufferHelper *helper,
                FencedAllocatorWrapper *shm_allocator,
                unsigned int shm_id,
                IdAllocator *param_id_allocator)
       : helper_(helper),
         shm_allocator_(shm_allocator),
         shm_id_(shm_id),
         param_id_allocator_(param_id_allocator) {
     DCHECK(helper);
@@ skipping 40 matching lines @@
   //   - invalid parameter ResourceID,
   //   - not enough memory in the shm_allocator_.
   bool GetParamStrings(EffectParamDesc *desc);
 
   // Destroys all parameter resources referenced by the descriptions. The
   // ResourceID will be freed from the param_id_allocator.
   // Parameters:
   //   descs: the vector of descriptions containing the ResourceIDs of the
   //   parameters to destroy.
   void DestroyEffectParameters(const std::vector<EffectParamDesc> &descs);
+
+  // Gets all the input stream semantics and semantic indices in an
+  // array. These will be retrieved as many as possible at a time. At least
+  // sizeof(effect_param::Desc) must be available for this function to succeed.
+  // This function will call Finish(), hence will block.
+  //
+  // Parameters:
+  //   effect_id: the ResourceID of the effect.
+  //   descs:  A pointer to a vector containing the returned descriptions.
+  //   The pointed vector will be cleared.
+  // Returns:
+  //   true if successful. Reasons for failure are:
+  //   - invalid effect_id,
+  //   - not enough memory in the shm_allocator_.
+  bool GetEffectStreams(ResourceID effect_id,
+                        std::vector<EffectStreamDesc> *descs);
+
  private:
   CommandBufferHelper *helper_;
   FencedAllocatorWrapper *shm_allocator_;
   unsigned int shm_id_;
   IdAllocator *param_id_allocator_;
 
   DISALLOW_COPY_AND_ASSIGN(EffectHelper);
 };
 
 }  // namespace command_buffer
 }  // namespace o3d
 
 #endif  // O3D_COMMAND_BUFFER_CLIENT_CROSS_EFFECT_HELPER_H_