CODEWITHSUNDEEP
c++opengl
J J
J J

Reputation: 25

OpenGL get currently bound vertex buffer and index buffer

I'm currently working with OpenGL in C++, and I'm trying to debug by identifying what the currently bound vertex buffer and index buffer are. I have three functions.

GLint getBoundVAO()
{
    GLint id = 0;
    glGetIntegerv(GL_VERTEX_ARRAY_BINDING, &id);
    return id;
};

GLint getBoundVBO()
{
    GLint id = 0;
    // ???
    return id;
};

GLint getBoundIBO()
{
    GLint id = 0;
    // ???
    return id;
};

How would I go about getting the vertex buffer and index buffer in a similar way to how I am getting the VAO? I've looked at the OpenGL page https://www.khronos.org/registry/OpenGL-Refpages/gl4/html/glGet.xhtml and am not seeing a value which will allow me to get the index or vertex buffers.

Upvotes: 1

Views: 1974

Answers (1)

Yun
Yun

Reputation: 3812

See the "Parameters" section here. The symbolic constants used for binding the buffers match the ones used for glGet* (but with a _BINDING suffix).

For the vertex buffer object, use:

glGetIntegerv(GL_ARRAY_BUFFER_BINDING, &id);

For the index buffer, use:

glGetIntegerv(GL_ELEMENT_ARRAY_BUFFER_BINDING, &id);

Upvotes: 1

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