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use web_sys;
use web_sys::{WebGl2RenderingContext};
use wasm_bindgen::JsCast;
use crate::shader::Shaders;
pub struct Canvas {
element: web_sys::HtmlCanvasElement,
ctx: WebGl2RenderingContext,
shaders: Shaders,
}
impl Canvas {
pub fn new(element: web_sys::Element) -> Option<Self> {
let element: web_sys::HtmlCanvasElement =
element.dyn_into::<web_sys::HtmlCanvasElement>()
.ok()?;
debug!("create webgl2 context");
let ctx = element.get_context("webgl2").ok()??
.dyn_into::<WebGl2RenderingContext>().ok()?;
info!("created webgl2 context successfully");
Some(Self {
element, ctx,
shaders: Shaders::new(),
})
}
pub fn init(&mut self) -> Result<(), ()> {
debug!("create program");
self.shaders.create_program(&self.ctx)
.map_err(|e| error!("webgl2 create program: {}", e))?;
debug!("create vertex shader");
self.shaders.create_vertex_shader(&self.ctx)
.map_err(|e| error!("webgl2 create vertex shader: {}", e))?;
debug!("create fragment shader");
self.shaders.create_fragment_shader(&self.ctx)
.map_err(|e| error!("webgl2 create fragment shader: {}", e))?;
debug!("compile shader program");
self.shaders.compile(&self.ctx)
.map_err(|e| error!("webgl2 shader: {}", e))
}
}
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