// compile with
// cl.exe -nologo main.c -link opengl32.lib user32.lib gdi32.lib && main.exe

#include <Windows.h>
#include <GL/GL.h>

LRESULT window_proc(HWND window, UINT msg, WPARAM wparam, LPARAM lparam)
{
	LRESULT result = 0;
	switch(msg) {
		case WM_CLOSE:
		case WM_DESTROY: {
			PostQuitMessage(0);
		} break;

		default: { result = DefWindowProc(window, msg, wparam, lparam); }

	}
	return result;
}

int main()
{
	WNDCLASSEX c = {0};
	c.cbSize = sizeof(c);
	c.lpfnWndProc = window_proc;
	c.style = CS_OWNDC | CS_VREDRAW | CS_HREDRAW;
	c.lpszClassName = "hi youtube";
	c.hInstance = GetModuleHandle(NULL);
	RegisterClassEx(&c);

	HWND window = CreateWindow("hi youtube", "subscribe", WS_OVERLAPPEDWINDOW | WS_VISIBLE, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, NULL, NULL, GetModuleHandle(NULL), NULL);
	HDC dc = GetDC(window);
	PIXELFORMATDESCRIPTOR pfd = {0};
	pfd.nSize = sizeof(pfd);
	pfd.nVersion = 1;
	pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;
	pfd.cColorBits = 32;
	pfd.cAlphaBits = 8;
	pfd.cDepthBits = 24;
	int format = ChoosePixelFormat(dc, &pfd);
	SetPixelFormat(dc, format, &pfd);
	HGLRC glrc = wglCreateContext(dc);
	wglMakeCurrent(dc, glrc);
	MSG msg;
	while(1) {
		while(PeekMessage(&msg, NULL, 0, 0, PM_REMOVE) > 0) {
			if(msg.message == WM_QUIT) { return 0; }
			TranslateMessage(&msg);
			DispatchMessage(&msg);
		}
		glClearColor(0.1f, 0, 0, 0);
		glClear(GL_COLOR_BUFFER_BIT);


		glBegin(GL_TRIANGLES);
		glColor3f(1, 0, 0);
		glVertex2f(0, 0.5f);
		glColor3f(0, 1, 0);
		glVertex2f(-0.25f, -0.5f);
		glColor3f(0, 0, 1);
		glVertex2f(0.25f, -0.5f);
		glEnd();
		SwapBuffers(dc);
	}
	return 0;
}