Couple of oddities with PVRFrame

This topic contains 1 reply, has 2 voices, and was last updated by  jacekc 7 years, 2 months ago.

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    I’ve been messing with setting up a framebuffer with a renderable texture as colorbuffer on gles 1.1 using the PVRFrame drivers for windows. (

    The main issue seem to be when I’m allocating the colorbuffer surface using glTexImage2D, with NULL as data argument.

    Sometimes it will generate a GL_INVALID_VALUE, and sometimes not. And it doesn’t really matter what resolutions I pass. I always pass GL_RGBA and GL_UNSIGNED_BYTE as format and type.

    But even when it generates a glError it’s still perfectly fine to bind and use as a framebuffer color attachment. I just want to know what the fudge is causing this error, which isn’t even constant. I can have for example 512×512 as resolution and the application will launch without generating an error, next time I launch it will generate an error.

    The next thing is that I can’t seem to be able to attach a stencil buffer to the frame buffer. Whenever I try, glCheckFramebufferStatusOES will always return GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT_OES.

    I setup the stencilbuffer like this:

    // my framebuffer is bound at this stage

    GLint stencilbuffer;

    glGenRenderbuffersOES(1, &stencilbuffer);

    glBindRenderbufferOES(GL_RENDERBUFFER, stencilbuffer);

    glRenderbufferStorageOES(GL_RENDERBUFFER, GL_STENCIL_INDEX8_OES, width, height);

    // I have GL_OES_stencil8 extension, if I pass GL_STENCIL_INDEX it will generate a glError saying unsupported internal format

    glFramebufferRenderbufferOES(GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_RENDERBUFFER, stencilbuffer);

    None of these commands generate any glError, but glCheckFramebufferStatus will always fail.

    And one last thing, which doesn’t really have anything to do with framebuffers, but odd/buggy non the less. glGetIntegerv(GL_TEXTURE_2D, &value); will generate GL_INVALID_ENUM and doesn’t return the enable state of GL_TEXTURE_2D, this should not be the case for gles 1.1, only gles 2.0.

    Note that all this only applies to the PVRframe driver for windows (libgles_cm.dll), It seems to work fine on devices with the PVR-chipset.

    polarpeder2010-10-19 13:45:38



    Many thanks for your input.  We will shortly look to that so next release has this issues(at 2.7 there were some wronly set error messages) sorted out.

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