blob: b94441dce4fa02db5513c99186d187af2bf9520e (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
|
use log::*;
use crate::error::WasmError;
use wasm_bindgen::JsCast;
use web_sys::WebGl2RenderingContext as Gl;
pub struct GraphicsContext {
gl: Gl,
frame_nr: u64,
}
impl GraphicsContext {
pub fn from_canvas(canvas: web_sys::OffscreenCanvas) -> Result<Self, WasmError> {
let context = canvas.get_context("webgl2")
.map_err(|_| WasmError::WebGl2ContextCreation(
format!("context cration failed: getContext returned an exception")))?
.ok_or_else(|| WasmError::WebGl2ContextCreation(
format!("context cration failed: getContext returned nothing")))?;
let context = context
.dyn_into::<Gl>()
.map_err(|_| WasmError::WebGl2ContextCreation(
format!("context object is not a context")))?;
Ok(Self {
gl: context,
frame_nr: 0,
})
}
pub fn update(&mut self) -> Result<(), WasmError> {
let light = 0.5;
let a = (self.frame_nr as f32) / 60.0;
let a = f32::abs(f32::sin(a));
let b = f32::abs(f32::cos(a));
let (a, b) = (a * light, b * light);
self.gl.clear_color(a, light - a, b, 1.0);
self.gl.clear(Gl::COLOR_BUFFER_BIT);
self.frame_nr += 1;
Ok(())
}
}
|
