da_square.c

// Reject modernity, return to wrinkly ass GL shit
#if !defined(_WIN32)
#error "Fuck you"
#endif

#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <GL/gl.h>

#pragma comment(lib, "opengl32.lib")
#pragma comment(lib, "gdi32.lib")
#pragma comment(lib, "user32.lib")

// no need for do while crap if it's an expression :p
// it's basically an assert but it doesn't get vaporized
#define CHECK(x) ((x) ? (void)0 : abort())

static LRESULT CALLBACK WindowProc(HWND wnd, UINT msg, WPARAM wparam, LPARAM lparam) {
	if (msg == WM_DESTROY) {
		PostQuitMessage(0);
		return 0;
	}

	return DefWindowProcW(wnd, msg, wparam, lparam);
}

int main() {
	WNDCLASSEXW wc = {
		.cbSize = sizeof(wc),
		.lpfnWndProc = WindowProc,
		.hInstance = GetModuleHandleA(NULL),
		.lpszClassName = L"MINE"
	};
	CHECK(RegisterClassExW(&wc));

	HWND window = CreateWindowExW(
		WS_EX_APPWINDOW, L"MINE", L"Da square", WS_OVERLAPPEDWINDOW,
		CW_USEDEFAULT, CW_USEDEFAULT, 1280, 720, NULL, NULL, wc.hInstance, NULL
	);
	CHECK(window);

	ShowWindow(window, SW_SHOW);
	SetFocus(window);

	// WGL shit
	HDC dc = GetDC(window);

	PIXELFORMATDESCRIPTOR pfd = {
		.nSize = sizeof(pfd),
		.nVersion = 1,
		.iPixelType = PFD_TYPE_RGBA,
		.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER,
		.cColorBits = 32,
		.cAlphaBits = 8,
		.iLayerType = PFD_MAIN_PLANE
	};

	int pixel_format;
	CHECK(pixel_format = ChoosePixelFormat(dc, &pfd));
	CHECK(SetPixelFormat(dc, pixel_format, &pfd));

	HGLRC glctx;
	CHECK(glctx = wglCreateContext(dc));
	CHECK(wglMakeCurrent(dc, glctx));

	for (;;) {
		// da pump
		MSG msg;
		while (PeekMessageW(&msg, NULL, 0, 0, PM_REMOVE)) {
			if (msg.message == WM_QUIT) goto exit;
			
			TranslateMessage(&msg);
			DispatchMessageW(&msg);
		}

		glClear(GL_COLOR_BUFFER_BIT);	
		glBegin(GL_TRIANGLE_FAN);
		{
			glColor3f(0.5f, 0.5f, 0.0f);	
			glVertex2f(-0.5f, -0.5f);

			glColor3f(1.0f, 0.5f, 0.0f);
			glVertex2f( 0.5f, -0.5f);

			glColor3f(1.0f, 1.0f, 0.0f);
			glVertex2f( 0.5f, 0.5f);

			glColor3f(0.5f, 1.0f, 0.0f);
			glVertex2f(-0.5f, 0.5f);
		}
		glEnd();

		SwapBuffers(dc);
	}

	exit:
	return 0;
}