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use fmt;
use os;
use sdl2::{event_type, window_flags, renderer_flags};
use sdl2;
use sdl2::image;
use strings;
type texture = struct {
tex: *sdl2::texture,
w: int,
h: int,
};
type state = struct {
window: *sdl2::window,
render: *sdl2::renderer,
hare: texture,
cat: texture,
hare_x: int,
hare_y: int,
hare_dx: int,
hare_dy: int,
cat_x: int,
cat_y: int,
};
export fn main() void = {
sdl2::init(sdl2::init_flags::VIDEO);
defer sdl2::quit();
let flags = image::init(image::init_flags::PNG | image::init_flags::JPG);
defer image::quit();
const title = strings::to_c("Hare SDL2 demo");
defer free(title);
const win = match (sdl2::create_window(title,
sdl2::WINDOWPOS_UNDEFINED, sdl2::WINDOWPOS_UNDEFINED,
640, 480, window_flags::NONE)) {
case let win: *sdl2::window =>
yield win;
case null =>
fmt::fatal("sdl2::create_window failed");
};
defer sdl2::destroy_window(win);
const render = match (sdl2::create_renderer(win, -1, renderer_flags::NONE)) {
case let rend: *sdl2::renderer =>
yield rend;
case null =>
fmt::fatal("sdl2::create_renderer failed");
};
defer sdl2::destroy_renderer(render);
let state = state {
window = win,
render = render,
hare = load_texture(render, "mascot.jpg"),
cat = load_texture(render, "cat.png"),
hare_x = 100,
hare_y = 100,
hare_dx = 2,
hare_dy = 2,
...
};
defer sdl2::destroy_texture(state.hare.tex);
defer sdl2::destroy_texture(state.cat.tex);
let ev = sdl2::event { ... };
for (true) {
if (sdl2::poll_event(&ev) == 1) switch (ev.event_type) {
case event_type::QUIT =>
break;
case => void;
};
update(&state);
draw(&state);
sdl2::delay(1000 / 60);
};
os::exit(0); // https://todo.sr.ht/~sircmpwn/hare/525
};
fn load_texture(render: *sdl2::renderer, path: str) texture = {
const path = strings::to_c(path);
defer free(path);
const tex = match (image::load_texture(render, path)) {
case let tex: *sdl2::texture =>
yield tex;
case null =>
fmt::fatal("sdl2::image::load_texture failed for cat.png");
};
let w = 0, h = 0;
sdl2::query_texture(tex, null, null, &w, &h);
return texture {
tex = tex,
w = w,
h = h,
};
};
fn update(state: *state) void = {
let width = 0, height = 0;
sdl2::get_window_size(state.window, &width, &height);
state.hare_x += state.hare_dx;
state.hare_y += state.hare_dy;
if (state.hare_x <= 0 || state.hare_x + state.hare.w >= width) {
state.hare_dx = -state.hare_dx;
};
if (state.hare_y <= 0 || state.hare_y + state.hare.h >= height) {
state.hare_dy = -state.hare_dy;
};
};
fn draw(state: *state) void = {
sdl2::set_render_draw_color(state.render, 50, 50, 50, 255);
sdl2::render_clear(state.render);
draw_tex(state, &state.hare, state.hare_x, state.hare_y);
draw_tex(state, &state.cat, state.cat_x, state.cat_y);
sdl2::render_present(state.render);
};
fn draw_tex(state: *state, tex: *texture, x: int, y: int) void = {
sdl2::render_copy(state.render, tex.tex, null, &sdl2::rect {
x = x,
y = y,
w = tex.w,
h = tex.h,
});
};
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