Need help with FBO on Nvidia Card.

[lethep]

I wanna create a frame buffer object. and just attach one depth texture to fetch the depth value. but ,.........
we always got GL_FRAMEBUFFER_UNSUPPORTED_EXT when we check fbo status.
but when test on ATI 7900 Card. the fbo successful. (my card is Nvidia GF 6600)

below is my code. please help me ,what's wrong with them.

GLuint fbo,tex;

// create depth texture.
glGenTextures(1, &tex);
glBindTexture(GL_TEXTURE_2D, tex);
glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT24, 256, 256, 0, GL_DEPTH_COMPONENT, GL_UNSIGNED_BYTE, NULL);

 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);

// create fbo 
glGenFramebuffersEXT(1, &fbo);
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fbo);
// attach tex to depth buffer
glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, 
                              GL_TEXTURE_2D, tex, 0);

glDrawBuffer(GL_NONE);
glReadBuffer(GL_NONE);

// check status.
 GLenum status;
    status = (GLenum) glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
    switch(status) {
        case GL_FRAMEBUFFER_COMPLETE_EXT:
            break;
        case GL_FRAMEBUFFER_UNSUPPORTED_EXT:
            printf("Unsupported framebuffer format\n");
            break;
        case GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT_EXT:
            printf("Framebuffer incomplete, missing attachment\n");
            break;
        case GL_FRAMEBUFFER_INCOMPLETE_DUPLICATE_ATTACHMENT_EXT:
            printf("Framebuffer incomplete, duplicate attachment\n");
            break;
        case GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS_EXT:
            printf("Framebuffer incomplete, attached images must have same dimensions\n");
            break;
        case GL_FRAMEBUFFER_INCOMPLETE_FORMATS_EXT:
            printf("Framebuffer incomplete, attached images must have same format\n");
            break;
        case GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER_EXT:
            printf("Framebuffer incomplete, missing draw buffer\n");
            break;
        case GL_FRAMEBUFFER_INCOMPLETE_READ_BUFFER_EXT:
            printf("Framebuffer incomplete, missing read buffer\n");
            break;
        default:
            assert(0);
    }

 

[Rodéric]

try with DEPTH24_STENCIL8, try to change with GL_CLAMP, don't remember what combo of settings are supported, at least you have 2 params to toy with...