stencil buffer

OpenGL OpenGL: Basic Coding
1

hello,

how can i check if my graphic card support a stencil buffer?

can i do this with:

glGetIntegerv(GL_STENCIL_BITS, &stencil);

because when i print the integer stencil the value is 0.

thanks

helda

2

How do you create your window? Your probably didn’t create a window that has a stencil buffer. If you’re using Win32, there’s a cStencilBits field in the PIXELFORMATDESCRIPTOR struct that you use. If you are using glut, you use GLUT_STENCIL for one of the options in the glutInitDisplayMode function.

[This message has been edited by Deiussum (edited 11-06-2002).]

3

o **** i’m so stupid, thank you for that tip.

4

hmmmm anyone have any idea why stencil buffer might be slow??I tried it with 16,8,4,2,1 bits but its always slow like hell.My comp is a p4 1.4 with a gforce 2mx 400 64 ram and 256 mgs of memory O_o.
And one thing i noticed is that it gets faster when the object that is rendered into the stencil buffer get away from the camera.

5

Are you asking for a stencil buffer in 16 bit color depth? If so, you’re not getting hardware accelerated rendering. Stencil buffers are only supported in 32 bit color depth on the earlier GeForce series.

6

So i need to set color depth to 32 and what about the stencil bit??Does that matter much?

7

Stencil should be 8 bits. And I suppose it matters much; software vs hardware renering.