GPU/HW: Use uniform blocks for batch rendering

src/common/gl_stream_buffer.cpp

@@ -24,7 +24,7 @@ void StreamBuffer::Unbind()
 
 StreamBuffer::MappingResult StreamBuffer::Map(u32 alignment, u32 min_size)
 {
-  return MappingResult{static_cast<void*>(m_cpu_buffer.data()), 0, m_size / alignment};
+  return MappingResult{static_cast<void*>(m_cpu_buffer.data()), 0, 0, m_size / alignment};
 }
 
 void StreamBuffer::Unmap(u32 used_size)

src/common/gl_stream_buffer.h

@@ -22,6 +22,7 @@ public:
   struct MappingResult
   {
     void* pointer;
+    u32 buffer_offset;
     u32 index_aligned; // offset / alignment, suitable for base vertex
     u32 space_aligned; // remaining space / alignment
   };