1×1 Scissor Rect

The 1×1 Scissor Rect override mode cuts pixel processing from a pipeline: if the frame rate does not increase after enabling this override, then a complex geometry or vertex shader is a bottleneck. In this case you can use the Wireframe override mode to check whether the geometry is complex; if it is not, then the vertex shader is the bottleneck.

However, the implementation of this override mode is driver/graphics hardware vendor specific, therefore you should apply scissoring prior to or after the pixel shader stage.


On the Intel® GMA 4500/X4500/X4500HD/4500MHD devices, scissoring occurs prior to pixel shader stage, and only one pixel location will have pixel shader activity. This effectively removes all pixel shader compute time, texturing, and pixel fill rate overhead.

See Also

Override Modes Overview
Disable all overrides
Null Hardware

Disable Draw Calls
2×2 Texture
Simple Pixel Shader
Disable Texture Filtering
Disable Z-Test
Disable Z-Write

Cull None
Cull Clockwise
Cull Counter-Clockwise

Disable Alpha Blending
Disable Alpha Test
Overdraw Visualization
FPS Limit

1×1 Scissor Rect