1 files changed, 39 insertions, 0 deletions
diff --git a/WebInterface/wasm/asm-paint/src/canvas.rs b/WebInterface/wasm/asm-paint/src/canvas.rs
new file mode 100644
index 0000000..400e258
--- /dev/null
+++ b/WebInterface/wasm/asm-paint/src/canvas.rs
@@ -0,0 +1,39 @@
+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<(), ()> {
+        self.shaders.init(&self.ctx).map_err(|_|())?;
+        self.ctx.clear_color(1.0, 0.2, 1.0, 1.0);
+        self.ctx.clear(WebGl2RenderingContext::COLOR_BUFFER_BIT);
+        Ok(())
+    }
+}
+
+impl Drop for Canvas {
+    fn drop(&mut self) {
+        self.shaders.remove(&self.ctx);
+    }
+}