Wiring up register read/write from JIT -> GPU.

src/xenia/cpu/x64/x64_emitter.h

@@ -31,6 +31,8 @@ public:
   X64Emitter(xe_memory_ref memory);
   ~X64Emitter();
 
+  void SetupGpuPointers(void* gpu_this, void* gpu_read, void* gpu_write);
+
   void Lock();
   void Unlock();
 
@@ -55,6 +57,9 @@ public:
   int GenerateIndirectionBranch(uint32_t cia, AsmJit::GpVar& target,
                                 bool lk, bool likely_local);
 
+  AsmJit::GpVar read_gpu_register(uint32_t r);
+  void write_gpu_register(uint32_t r, AsmJit::GpVar& v);
+
   void FillRegisters();
   void SpillRegisters();
 
@@ -117,6 +122,10 @@ private:
   GlobalExports         global_exports_;
   xe_mutex_t*           lock_;
 
+  void*                 gpu_this_;
+  void*                 gpu_read_;
+  void*                 gpu_write_;
+
   AsmJit::Logger*       logger_;
   AsmJit::X86Assembler  assembler_;
   AsmJit::X86Compiler   compiler_;