From 96ee00242f350b391dcc1cf4d72a442c969f565e Mon Sep 17 00:00:00 2001
From: Ilion Beyst <ilion.beyst@gmail.com>
Date: Wed, 22 Dec 2021 13:59:13 +0100
Subject: add pw-frontend

---
 web/pw-frontend/src/lib/visualizer/webgl/index.ts | 122 ++++++++++++++++++++++
 1 file changed, 122 insertions(+)
 create mode 100644 web/pw-frontend/src/lib/visualizer/webgl/index.ts

(limited to 'web/pw-frontend/src/lib/visualizer/webgl/index.ts')

diff --git a/web/pw-frontend/src/lib/visualizer/webgl/index.ts b/web/pw-frontend/src/lib/visualizer/webgl/index.ts
new file mode 100644
index 0000000..fdb7886
--- /dev/null
+++ b/web/pw-frontend/src/lib/visualizer/webgl/index.ts
@@ -0,0 +1,122 @@
+import { Uniform4f, Uniform1f, Uniform2f, ShaderFactory, UniformMatrix3fv, Uniform3f } from './shader';
+import { resizeCanvasToDisplaySize, FPSCounter, onload2promise, Resizer, url_to_mesh } from "./util";
+import { VertexBuffer, IndexBuffer } from './buffer';
+import { VertexArray, VertexBufferLayout } from './vertexBufferLayout';
+import { Renderer } from './renderer';
+import { Texture } from './texture';
+
+const URL = window.location.origin+window.location.pathname;
+const LOCATION = URL.substring(0, URL.lastIndexOf("/") + 1);
+
+async function create_texture_from_svg(gl: WebGLRenderingContext, name: string, path: string, width: number, height: number): Promise<Texture> {
+
+    const [mesh, factory] = await Promise.all([
+        url_to_mesh(path),
+        ShaderFactory.create_factory(LOCATION + "static/shaders/frag/static_color.glsl", LOCATION + "static/shaders/vert/svg.glsl")
+    ]);
+
+    const program = factory.create_shader(gl);
+    const renderer = new Renderer();
+
+    var positionBuffer = new VertexBuffer(gl, mesh.positions);
+    var layout = new VertexBufferLayout();
+    layout.push(gl.FLOAT, 3, 4, "a_position");
+
+    const vao = new VertexArray();
+    vao.addBuffer(positionBuffer, layout);
+
+    program.bind(gl);
+    vao.bind(gl, program);
+
+    var indexBuffer = new IndexBuffer(gl, mesh.cells);
+    indexBuffer.bind(gl);
+
+    renderer.addToDraw(indexBuffer, vao, program, {});
+
+    return Texture.fromRenderer(gl, name, width, height, renderer);
+}
+
+
+async function main() {
+
+    // Get A WebGL context
+    var canvas = <HTMLCanvasElement>document.getElementById("c");
+    const resolution = [canvas.width, canvas.height];
+
+    const resizer = new Resizer(canvas, [-10, -10, 20, 20], true);
+
+    var gl = canvas.getContext("webgl");
+    if (!gl) {
+        return;
+    }
+
+    const mesh = await url_to_mesh("static/res/images/earth.svg");
+    console.log(Math.max(...mesh.positions), Math.min(...mesh.positions));
+    const renderer = new Renderer();
+
+    const factory = await ShaderFactory.create_factory(LOCATION + "static/shaders/frag/static_color.glsl", LOCATION + "static/shaders/vert/simple.glsl");
+    const program = factory.create_shader(gl);
+
+    var positionBuffer = new VertexBuffer(gl, mesh.positions);
+    var layout = new VertexBufferLayout();
+    layout.push(gl.FLOAT, 3, 4, "a_position");
+    // layout.push(gl.FLOAT, 2, 4, "a_tex");
+
+    const vao = new VertexArray();
+    vao.addBuffer(positionBuffer, layout);
+
+    resizeCanvasToDisplaySize(<HTMLCanvasElement>gl.canvas);
+
+    // Tell WebGL how to convert from clip space to pixels
+    gl.viewport(0, 0, gl.canvas.width, gl.canvas.height);
+
+    // Clear the canvas
+    gl.clearColor(0, 0, 0, 0);
+    gl.clear(gl.COLOR_BUFFER_BIT);
+
+    gl.enable(gl.BLEND);
+    gl.blendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA);
+
+    program.bind(gl);
+    vao.bind(gl, program);
+
+    var indexBuffer = new IndexBuffer(gl, mesh.cells);
+    indexBuffer.bind(gl);
+
+    renderer.addToDraw(indexBuffer, vao, program, {});
+
+    const counter = new FPSCounter();
+
+    const step = function (time: number) {
+
+        // console.log(resizer.get_viewbox());
+
+        program.uniform(gl, "u_time", new Uniform1f(time * 0.001));
+        program.uniform(gl, "u_mouse", new Uniform2f(resizer.get_mouse_pos()));
+        program.uniform(gl, "u_viewbox", new Uniform4f(resizer.get_viewbox()));
+        program.uniform(gl, "u_resolution", new Uniform2f(resolution));
+        program.uniform(gl, "u_trans", new UniformMatrix3fv([1, 0, 0, 0, 1, 0, 0, 0, 1]));
+        program.uniform(gl, "u_color", new Uniform3f(1.0, 0.5, 0.0));
+
+        renderer.render(gl);
+
+        counter.frame(time);
+        requestAnimationFrame(step);
+    }
+
+    requestAnimationFrame(step);
+}
+
+
+main();
+
+document.getElementById("loader").classList.remove("loading");
+
+// const loader = document.getElementById("loader");
+// setInterval(() => {
+//     if (loader.classList.contains("loading")) {
+//         loader.classList.remove("loading")
+//     } else {
+//         loader.classList.add("loading");
+//     }
+// }, 2000);
-- 
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