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|
use glow::HasContext;
#[cfg(target_arch = "wasm32")]
use winit::platform::web::WindowExtWebSys;
#[cfg(target_arch = "wasm32")]
#[link(wasm_import_module = "./helpers.js")]
extern {
fn js_track_resized_setup();
fn js_poll_resized() -> bool;
}
pub const RENDER_WIDTH: f32 = 240.0;
pub const RENDER_HEIGHT: f32 = 160.0;
pub fn compute_upscale(windoww: u32, windowh: u32) -> u32 {
let mut ratio = 1;
loop {
if (RENDER_WIDTH as u32) * ratio > windoww
|| (RENDER_HEIGHT as u32) * ratio > windowh
{
break;
}
ratio += 1;
}
(ratio - 1).max(1)
}
pub struct Context {
pub window: winit::window::Window,
pub gl: glow::Context,
pub emptyvao: glow::VertexArray,
#[cfg(target_arch = "wasm32")]
pub performance: web_sys::Performance,
}
impl Context {
pub fn new(window: winit::window::Window, gl: glow::Context) -> Self {
unsafe {
gl.clear_color(0.1, 0.1, 0.1, 1.0);
gl.clear_depth_f32(1.0);
gl.enable(glow::DEPTH_TEST);
gl.depth_func(glow::LEQUAL);
gl.enable(glow::BLEND);
gl.blend_func(glow::SRC_ALPHA, glow::ONE_MINUS_SRC_ALPHA);
gl.enable(glow::STENCIL_TEST);
gl.cull_face(glow::FRONT);
}
let emptyvao = unsafe {
gl.create_vertex_array().expect("failed to initialize vao")
};
#[cfg(target_arch = "wasm32")]
unsafe { js_track_resized_setup(); }
Self {
window,
gl,
emptyvao,
#[cfg(target_arch = "wasm32")]
performance: web_sys::window().expect("failed to find window")
.performance().expect("failed to get performance"),
}
}
#[cfg(target_arch = "wasm32")]
pub fn maximize_canvas(&self) {
web_sys::window()
.and_then(|win| win.document())
.and_then(|doc| {
let inner_size = {
let browser_window = doc.default_view()
.or_else(web_sys::window)
.unwrap();
winit::dpi::PhysicalSize::new(
browser_window.inner_width().unwrap().as_f64().unwrap(),
browser_window.inner_height().unwrap().as_f64().unwrap(),
)
};
self.window.canvas().unwrap().set_width(inner_size.width as _);
self.window.canvas().unwrap().set_height(inner_size.height as _);
let _ = self.window.request_inner_size(inner_size);
Some(())
})
.expect("failed to resize canvas");
}
#[cfg(target_arch = "wasm32")]
pub fn resize_necessary(&self) -> bool {
unsafe {
js_poll_resized()
}
}
#[cfg(not(target_arch = "wasm32"))]
pub fn resize_necessary(&self) -> bool {
false
}
pub fn clear_color(&self, color: glam::Vec4) {
unsafe {
self.gl.clear_color(color.x, color.y, color.z, color.w);
}
}
pub fn clear_depth(&self) {
unsafe {
self.gl.clear(glow::DEPTH_BUFFER_BIT);
}
}
pub fn clear(&self) {
unsafe {
self.gl.stencil_mask(0xff);
self.gl.clear(glow::COLOR_BUFFER_BIT | glow::DEPTH_BUFFER_BIT | glow::STENCIL_BUFFER_BIT);
}
}
pub fn begin_stencil(&self) {
unsafe {
self.gl.stencil_func(glow::ALWAYS, 1, 0xff);
self.gl.stencil_op(glow::KEEP, glow::KEEP, glow::REPLACE);
}
}
pub fn use_stencil(&self) {
unsafe {
self.gl.stencil_func(glow::EQUAL, 1, 0xff);
self.gl.stencil_op(glow::KEEP, glow::KEEP, glow::KEEP);
}
}
pub fn end_stencil(&self) {
unsafe {
self.gl.stencil_func(glow::ALWAYS, 1, 0xff);
self.gl.stencil_op(glow::KEEP, glow::KEEP, glow::KEEP);
}
}
pub fn render_no_geometry(&self) {
unsafe {
self.gl.bind_vertex_array(Some(self.emptyvao));
self.gl.draw_arrays(glow::TRIANGLE_STRIP, 0, 4);
}
}
pub fn reset_blend(&self) {
unsafe {
self.gl.blend_func(glow::SRC_ALPHA, glow::ONE_MINUS_SRC_ALPHA);
}
}
pub fn inverse_blend(&self) {
unsafe {
self.gl.blend_func(
glow::ONE_MINUS_DST_COLOR,
glow::ZERO,
);
}
}
pub fn enable_culling(&self) {
unsafe {
self.gl.enable(glow::CULL_FACE);
}
}
pub fn disable_culling(&self) {
unsafe {
self.gl.disable(glow::CULL_FACE);
}
}
}
|
