Imagination PowerVR SDK Blog

Will the fragments out of the rect defined by glScissor() be processed by Pixel Shader ?


HI all

If I define a rect (x=0, y=0, w=300, h=300) using glScissor(), I want to know whether the clip operation executing before Pixel Shader or after it?

If a fragment represents the pixel(301, 301) on screen, it cannot be drawn on screen buffer surely. But I want to know if it is cut off before entering the Pixel Shader.

Thanks a lot!



Sorry for “Pixel Shader” , I means “Fragments Shader”.


Hi Chris,

The scissor is applied before fragment shaders execute. The only fragments that will be shaded are those that fall within the bounds of the scissor region.




Thank you, Joe.