Imagination PowerVR SDK Blog

about the stencil buffer


#1

hi,

 

I want to know if there is the stencil buffer in the OpenGL ES 1.1. I have write the code:

GLint bit;
glGetIntegerv           (GL_STENCIL_BITS, &bit);

 

the bit == 0,  hope help me if it exist.

 

best regards

#2

PowerVR MBX does not support stencil so this query will always return 0 on platforms with MBX. If you tell us what you’re trying to achieve we might be able to suggest alternative methods.


#3

The shadow volumes will use the stencil buffer,  and now I have no idear  except use the shadow map technology.  But I want to use the shadow volumes,  it means must use the stencil buffer. How can I do?


#4

I’m afraid there’s not much you can do. The absence of subtractive blending means using blending to count front and back faces of shadow volumes is not a viable option either.