message: Get DataType from internal format if there's no hint
  * dataType would never have been eGL_NONE previously, since it's either set to
  the hint or eGL_UNSIGNED_BYTE.
diff: @@ -552,7 +552,7 @@ void GLResourceManager::CreateTextureImage(GLuint tex, GLenum internalFormat,
  {
  baseFormat = GetBaseFormat(internalFormat);
  - if(dataType == eGL_NONE)
  + if(internalFormatHint == eGL_NONE)
  dataType = GetDataType(internalFormat);
  }
  