Naive OpenGL Occlusion Query implementation (don't do this).

r_occlude_wrong.c

glBeginQuery(GL_ANY_SAMPLES_PASSED, query->name);
glDrawElements(GL_TRIANGLES, 36, GL_UNSIGNED_INT, query->elements); // draw the AABB
glEndQuery(GL_ANY_SAMPLES_PASSED);

glGetQueryObjectiv(query->name, GL_QUERY_RESULT, &query->result);
if (query->result) {
    // draw the object(s) the query was guarding
}