Re: [PyOpenGL-Users] Odd framebuffer error

[Mike C. F. <mcf...@vr...>]

On 10-11-30 02:40 PM, Derakon wrote:
...

> I made a test program that works fine (on my OSX laptop), but I'm
> running into an error when I try to adapt the code to the main program
> (on a considerably more powerful Windows 7 box). Each small texture is
> contained in a Tile class instance, and a single Tile can be placed
> and oriented arbitrarily. Meanwhile, the entire working area is tiled
> with MegaTile instances; Tiles are pre-rendered onto MegaTiles using
> framebuffers as needed. However, I'm getting a 1286 error when I call
> glEnd() after rendering a Tile. From what I can tell this means I
> didn't set up the framebuffer properly, but it looks fine to me. I
> must be missing something.
>   
Win32 has some funkiness relating to FBOs, from OpenGLContext's shadow
tutorial:

            fbo = glGenFramebuffers(1)
            '''It has to be bound to configure it.'''
            glBindFramebuffer(GL_FRAMEBUFFER, fbo )
            '''The texture itself is the same as the last tutorial.'''
            texture = glGenTextures( 1 )
            glBindTexture( GL_TEXTURE_2D, texture )
            glTexImage2D(
                GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT,
                shadowMapSize, shadowMapSize, 0,
                GL_DEPTH_COMPONENT, GL_FLOAT, None
            )
            '''We attach the texture to the FBO's depth attachment
point.  There
            is also a combined depth-stencil attachment point when certain
            extensions are available.  We don't actually need a stencil
buffer
            just now, so we can ignore that.

            The final argument is the "mip-map-level" of the texture,
            which currently always must be 0.
            '''
            glFramebufferTexture2D(
                GL_FRAMEBUFFER,
                GL_DEPTH_ATTACHMENT,
                GL_TEXTURE_2D,
                texture,
                0 #mip-map level...
            )
            if sys.platform == 'win32':
                color = glGenRenderbuffers(1)
                glBindRenderbuffer( GL_RENDERBUFFER, color )
                glRenderbufferStorage(
                    GL_RENDERBUFFER,
                    GL_RGBA,
                    shadowMapSize,
                    shadowMapSize,
                )
                glFramebufferRenderbuffer( GL_FRAMEBUFFER,
GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, color )
                glBindRenderbuffer( GL_RENDERBUFFER, 0 )
            holder = mode.cache.holder(
                light,(fbo,texture),key=key
            )

don't have time to track down why that was done this morning, but I'd
suspect that's likely where you're getting tripped up.

HTH,
Mike

-- 
________________________________________________
  Mike C. Fletcher
  Designer, VR Plumber, Coder
  http://www.vrplumber.com
  http://blog.vrplumber.com