Many game render pipelines will draw the scene a dozen times; here's an article about the pipeline from GTA V, for example: http://www.adriancourreges.com/blog/

Many game render pipelines will draw the scene a dozen times; here's an article about the pipeline from GTA V, for example: http://www.adriancourreges.com/blog/2015/11/02/gta-v-graphics-study/ http://www.adriancourreges.com/blog/2015/11/02/gta-v-graphic... Adding one more draw call for mouse interaction, especially one that requires no shading at all, is a pretty minimal additional cost.