OpenGL invalid operation: copy depth render buffer to default depth buffer

Question

I tried to follow Copying depth render buffer to the depth buffer but it does not work for me. Here is my complete example:

#include <GL/glew.h>
#include <GL/glfw.h>
#include <GL/glu.h>
#include <iostream>

typedef unsigned int uint;

int main()
{
    if (glfwInit() != 1)
    {
        return 1;
    }

    const uint width = 256;
    const uint height = 256;

    if (glfwOpenWindow(width, height, 8, 8, 8, 0, 24, 0, GLFW_WINDOW) != 1)
    {
        return 1;
    }

    GLenum err = glewInit();
    if (GLEW_OK != err)
    {
        std::cerr << glewGetErrorString(err) << std::endl;
        return 1;
    }

    GLuint r;
    glGenRenderbuffers(1, &r);
    glBindRenderbuffer(GL_RENDERBUFFER, r);
    glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT24, width, height);
    glBindRenderbuffer(GL_RENDERBUFFER, 0);

    GLuint r2;
    glGenRenderbuffers(1, &r2);
    glBindRenderbuffer(GL_RENDERBUFFER, r2);
    glRenderbufferStorage(GL_RENDERBUFFER, GL_RGBA4, width, height);
    glBindRenderbuffer(GL_RENDERBUFFER, 0);

    GLuint f;
    glGenFramebuffers(1, &f);
    glBindFramebuffer(GL_FRAMEBUFFER, f);
    glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, r);
    glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, r2);
    std::cout << (glCheckFramebufferStatus(GL_FRAMEBUFFER) == GL_FRAMEBUFFER_COMPLETE) << std::endl;
    glBindFramebuffer(GL_FRAMEBUFFER, 0);

    std::cout << gluErrorString(glGetError()) << std::endl;

    glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
    glBindFramebuffer(GL_READ_FRAMEBUFFER, f);
    glBlitFramebuffer(0, 0, width, height, 0, 0, width, height, GL_DEPTH_BUFFER_BIT, GL_NEAREST);

    std::cout << gluErrorString(glGetError()) << std::endl;

    return 0;
}

Output I get:

1
no error
invalid operation

The 24 in glfwOpenWindow is the number of depth bits. What am I doing wrong?

Why are you attaching a color renderbuffer when you are only using a depth buffer? — Nicol Bolas
– Nicol Bolas, Commented Jun 6, 2013 at 10:48
I wanted the framebuffer to be complete as I am not sure if it has any influence. — tauran
– tauran, Commented Jun 6, 2013 at 11:05
The code does not give an invalid operation for me. You could try with an 8-bit stencil (e.g. GL_DEPTH24_STENCIL8). — ThomasD
– ThomasD, Commented Jun 6, 2013 at 19:48

Tano · Accepted Answer · 2015-08-28 21:39:24Z

2

The parameters to glfwOpenWindow are specifying the desired values. However, it's entirely possible that your driver doesn't support the exact format you're asking for (24 bit color, 24 bit depth, no alpha, no stencil). GLFW will attempt to find the best match while meeting your minimums.

In this case it's probably giving you the most standard format of RGBA color (32 bit) and a 24/8 bit depth/stencil buffer, or it could be creating a 32 bit depth buffer. You'd actually need to call glfwGetWindowParam to query the depth and stencil bits for the default framebuffer, and then build your renderbuffers to match that.

answered Aug 28, 2015 at 21:39

Tano

29.4k8 gold badges66 silver badges92 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

tauran · Accepted Answer · 2015-08-31 14:21:05Z

0

As ThomasD suggested in the comments GL_DEPTH24_STENCIL8 worked.

answered Aug 31, 2015 at 14:21

tauran

8,0766 gold badges44 silver badges49 bronze badges

1 Comment

Tano Over a year ago

That's all well and good, but since the original code worked fine on his machine, it's more important people coming to look at this question in the future to understand why it failed on your machine and succeeded on his. Especially since someone else running different drivers / hardware might not be able to find success just by changing the stencil format in the same way.

Collectives™ on Stack Overflow

OpenGL invalid operation: copy depth render buffer to default depth buffer

2 Answers 2

Comments

1 Comment

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

1 Comment

Your Answer

Sign up or log in

Post as a guest

Linked

Related