// Compile with c++ ./depth_stencil_unbind.cc -Wall $(pkg-config --cflags --libs glew sdl2 gl) -o depth_stencil_unbind

#include <GL/glew.h>
#include <SDL.h>
#include <SDL_video.h>
#include <iostream>
#include <cassert>

#define assert_gl_no_error assert(glGetError() == GL_NO_ERROR)

int main()
{
	SDL_Init(SDL_INIT_VIDEO);
	SDL_Window * const window = SDL_CreateWindow(
		"Repeated creation of program binaries",
		SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 256, 256,
		SDL_WINDOW_OPENGL);
	if (!window)
	{
		std::cerr << "Could not create window: "
		          << SDL_GetError() << '\n';
		return 1;
	}

	SDL_GLContext gl_context = SDL_GL_CreateContext(window);

	const GLenum glew_error = glewInit();
	if (glew_error != GLEW_OK)
	{
		std::cerr << "Could not initialise glew : "
		          << glewGetErrorString(glew_error)<< '\n';
		return 1;
	}

	GLuint renderbuffer;
	glGenRenderbuffers(1, &renderbuffer);
	assert(glGetError() == GL_NO_ERROR);
	
	glBindRenderbuffer(GL_RENDERBUFFER, renderbuffer);
	assert(glGetError() == GL_NO_ERROR);

	glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8, 256, 256);
	assert(glGetError() == GL_NO_ERROR);

	GLuint framebuffer;
	glGenFramebuffers(1, &framebuffer);
	assert(glGetError() == GL_NO_ERROR);
	
	glBindFramebuffer(GL_DRAW_FRAMEBUFFER, framebuffer);
	assert(glGetError() == GL_NO_ERROR);

	glFramebufferRenderbuffer(GL_DRAW_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT, GL_RENDERBUFFER, renderbuffer);
	assert(glGetError() == GL_NO_ERROR);

	glFramebufferRenderbuffer(GL_DRAW_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT, GL_RENDERBUFFER, 0);
	assert(glGetError() == GL_NO_ERROR);

	GLint attachment_type;
	glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, &attachment_type);
	assert(glGetError() == GL_NO_ERROR);
	assert(attachment_type == GL_NONE);

	SDL_GL_DeleteContext(gl_context);
	SDL_DestroyWindow(window);
	SDL_Quit();
}