glScissor + glClear(depth|stencil) + render to shadow buffer == broken

OpenGL OpenGL: Advanced Coding
1

Im having some really weird issues trying to clear the depth in my shadow buffer. It seems that having calling glScissor(0,0,shadowwidth-1,shadowwidth-1) makes glClear not clear the depth at all, whereas glScissor(0,0,shadowwidth,shadowwidth) clears the entire depth buffer. my glClearDepth is 1. Does anyone have any idea why this behavior would be happening?

2

Hi Jello,

What GPU and drivers are you using?

Cass

3

GeForce3 4072 WHQL.

4

Do you think it might be a driver bug cass? Thanks for checking it out.

5

UPDATE: When i use just regular pbuffers and copytexsubimage the scissor technique appears to work fine.