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import win32 "sys/windows.odin" when ODIN_OS == "windows";
import wgl "sys/wgl.odin" when ODIN_OS == "windows";
import "fmt.odin";
import "math.odin";
import "os.odin";
import gl "opengl.odin";
const TWO_HEARTS = '💕';
var win32_perf_count_freq = win32.get_query_performance_frequency();
proc time_now() -> f64 {
assert(win32_perf_count_freq != 0);
var counter: i64;
win32.query_performance_counter(&counter);
return f64(counter) / f64(win32_perf_count_freq);
}
proc win32_print_last_error() {
var err_code = win32.get_last_error();
if err_code != 0 {
fmt.println("get_last_error: ", err_code);
}
}
// Yuk!
proc to_c_string(s: string) -> []u8 {
var c_str = make([]u8, len(s)+1);
copy(c_str, []u8(s));
c_str[len(s)] = 0;
return c_str;
}
type Window struct {
width, height: int,
wc: win32.WndClassExA,
dc: win32.Hdc,
hwnd: win32.Hwnd,
opengl_context, rc: wgl.Hglrc,
c_title: []u8,
}
proc make_window(title: string, msg, height: int, window_proc: win32.WndProc) -> (Window, bool) {
using win32;
var w: Window;
w.width, w.height = msg, height;
var class_name = "Win32-Odin-Window\x00";
var c_class_name = &class_name[0];
if title[len(title)-1] != 0 {
w.c_title = to_c_string(title);
} else {
w.c_title = []u8(title);
}
var instance = get_module_handle_a(nil);
w.wc = WndClassExA{
size = size_of(WndClassExA),
style = CS_VREDRAW | CS_HREDRAW,
instance = Hinstance(instance),
class_name = c_class_name,
wnd_proc = window_proc,
};
if register_class_ex_a(&w.wc) == 0 {
win32_print_last_error();
return w, false;
}
w.hwnd = create_window_ex_a(0,
c_class_name, &w.c_title[0],
WS_VISIBLE | WS_OVERLAPPED | WS_CAPTION | WS_SYSMENU | WS_MINIMIZEBOX,
CW_USEDEFAULT, CW_USEDEFAULT,
i32(w.width), i32(w.height),
nil, nil, instance, nil);
if w.hwnd == nil {
win32_print_last_error();
return w, false;
}
w.dc = get_dc(w.hwnd);
{
var pfd = PixelFormatDescriptor{
size = size_of(PixelFormatDescriptor),
version = 1,
flags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER,
pixel_type = PFD_TYPE_RGBA,
color_bits = 32,
alpha_bits = 8,
depth_bits = 24,
stencil_bits = 8,
layer_type = PFD_MAIN_PLANE,
};
set_pixel_format(w.dc, choose_pixel_format(w.dc, &pfd), nil);
w.opengl_context = wgl.create_context(w.dc);
wgl.make_current(w.dc, w.opengl_context);
var attribs = [8]i32{
wgl.CONTEXT_MAJOR_VERSION_ARB, 2,
wgl.CONTEXT_MINOR_VERSION_ARB, 1,
wgl.CONTEXT_PROFILE_MASK_ARB, wgl.CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB,
0, // NOTE(bill): tells the proc that this is the end of attribs
};
var wgl_str = "wglCreateContextAttribsARB\x00";
var wglCreateContextAttribsARB = wgl.CreateContextAttribsARBType(wgl.get_proc_address(&wgl_str[0]));
w.rc = wglCreateContextAttribsARB(w.dc, nil, &attribs[0]);
wgl.make_current(w.dc, w.rc);
swap_buffers(w.dc);
}
return w, true;
}
proc destroy_window(w: ^Window) {
free(w.c_title);
}
proc display_window(w: ^Window) {
win32.swap_buffers(w.dc);
}
proc run() {
using math;
proc win32_proc(hwnd: win32.Hwnd, msg: u32, wparam: win32.Wparam, lparam: win32.Lparam) -> win32.Lresult #no_inline {
using win32;
if msg == WM_DESTROY || msg == WM_CLOSE || msg == WM_QUIT {
os.exit(0);
return 0;
}
return def_window_proc_a(hwnd, msg, wparam, lparam);
}
var window, window_success = make_window("Odin Language Demo", 854, 480, win32.WndProc(win32_proc));
if !window_success {
return;
}
defer destroy_window(&window);
gl.init();
using win32;
var prev_time = time_now();
var running = true;
var pos = Vec2{100, 100};
for running {
var curr_time = time_now();
var dt = f32(curr_time - prev_time);
prev_time = curr_time;
var msg: Msg;
for peek_message_a(&msg, nil, 0, 0, PM_REMOVE) > 0 {
if msg.message == WM_QUIT {
running = false;
}
translate_message(&msg);
dispatch_message_a(&msg);
}
if is_key_down(KeyCode.Escape) {
running = false;
}
{
const SPEED = 500;
var v: Vec2;
if is_key_down(KeyCode.Right) { v[0] += 1; }
if is_key_down(KeyCode.Left) { v[0] -= 1; }
if is_key_down(KeyCode.Up) { v[1] += 1; }
if is_key_down(KeyCode.Down) { v[1] -= 1; }
v = norm(v);
pos += v * Vec2{SPEED * dt};
}
gl.ClearColor(0.5, 0.7, 1.0, 1.0);
gl.Clear(gl.COLOR_BUFFER_BIT);
gl.LoadIdentity();
gl.Ortho(0, f64(window.width),
0, f64(window.height), 0, 1);
proc draw_rect(x, y, w, h: f32) {
gl.Begin(gl.TRIANGLES);
defer gl.End();
gl.Color3f(1, 0, 0); gl.Vertex3f(x, y, 0);
gl.Color3f(0, 1, 0); gl.Vertex3f(x+w, y, 0);
gl.Color3f(0, 0, 1); gl.Vertex3f(x+w, y+h, 0);
gl.Color3f(0, 0, 1); gl.Vertex3f(x+w, y+h, 0);
gl.Color3f(1, 1, 0); gl.Vertex3f(x, y+h, 0);
gl.Color3f(1, 0, 0); gl.Vertex3f(x, y, 0);
}
draw_rect(pos.x, pos.y, 50, 50);
display_window(&window);
var ms_to_sleep = i32(16 - 1000*dt);
if ms_to_sleep > 0 {
win32.sleep(ms_to_sleep);
}
}
}
proc main() {
run();
}
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