c3c/resources/examples/emscripten/index.html-代码预览-c3c:基于C语法的演进型编程语言，支持泛型、模块和C ABI兼容

GGitHubWIP: Add `--target emscripten` (#3052)

<!DOCTYPE html>
<title>C3 WASM</title>
<style>
	body { background: #111; margin: 0; display: grid; height: 100vh; place-items: center; }
	canvas { background: #000; border: 2px solid #333; }
</style>
<canvas id="c" width="800" height="600"></canvas>
<script>
	const ctx = c.getContext('2d');
	let view, img, shared = false, ptr = 0;

	var Module = {
		onRuntimeInitialized: () => {
			ptr = Module._get_framebuffer();
			// Detect SharedArrayBuffer (from -pthread builds)
			shared = Module.HEAPU8.buffer instanceof SharedArrayBuffer;

			if (shared) {
				// We must use a local copy for ImageData on shared buffers
				view = new Uint8ClampedArray(800 * 600 * 4);
				img  = new ImageData(view, 800, 600);
			} else {
				// Direct mapping is OK for non-shared buffers
				view = new Uint8ClampedArray(Module.HEAPU8.buffer, ptr, 800 * 600 * 4);
				img  = new ImageData(view, 800, 600);
			}
			loop();
		}
	};

	function loop() {
		Module._update_and_render();

		if (shared) {
			// Sync shared memory to the local canvas view
			view.set(Module.HEAPU8.subarray(ptr, ptr + (800 * 600 * 4)));
		}

		ctx.putImageData(img, 0, 0);
		requestAnimationFrame(loop);
	}
</script>
<script src="build/index.js"></script>