message: Add check for glMap failing
diff: @@ -2307,7 +2307,10 @@ GLboolean WrappedOpenGL::glUnmapNamedBufferEXT(GLuint buffer)
  // We need to copy the data across to GL
  void *ptr = GL.glMapNamedBufferRangeEXT(buffer, (GLintptr)record->Map.offset,
  GLsizeiptr(record->Map.length), GL_MAP_WRITE_BIT);
  + if(ptr)
  memcpy(ptr, record->Map.ptr, record->Map.length);
  + else
  + RDCERR("Failed to map buffer for update");
  GL.glUnmapNamedBufferEXT(buffer);
  }
  