fix pixelated bug and introduce ball shader

frontend/src/App.tsx

@@ -83,6 +83,7 @@ function App() {
             <option value="default">Default Theme</option>
             <option value="blackhole">Blackhole Theme</option>
             <option value="star">Star Theme</option>
+            <option value="ball">Universe Ball Theme</option>
           </select>
         </div>
         {isShaderTheme && <ShaderBackground theme= {theme} />}

frontend/src/ShaderBackground.tsx

@@ -2,6 +2,7 @@ import { useEffect, useRef } from "react";
 
 import BLACKHOLE_SHADER_CODE from "./assets/blackhole.glsl?raw";
 import STAR_SHADER_CODE from "./assets/star.glsl?raw";
+import BALL_SHADER_CODE from "./assets/ball.glsl?raw";
 
 function buildProgram(
   ctx: WebGL2RenderingContext,
@@ -117,7 +118,9 @@ type ShaderBackgroundProps = {
   theme: string;
 };
 
-export const ShaderBackground: React.FC<ShaderBackgroundProps> = ({ theme }) => {
+export const ShaderBackground: React.FC<ShaderBackgroundProps> = ({
+  theme,
+}) => {
   const canvasRef = useRef<HTMLCanvasElement>(null);
 
   useEffect(() => {
@@ -139,6 +142,9 @@ export const ShaderBackground: React.FC<ShaderBackgroundProps> = ({ theme }) =>
       case "star":
         shader_code = STAR_SHADER_CODE;
         break;
+      case "ball":
+        shader_code = BALL_SHADER_CODE;
+        break;
       default:
         console.error("Unknown shader theme:", theme);
         return;
@@ -179,7 +185,13 @@ export const ShaderBackground: React.FC<ShaderBackgroundProps> = ({ theme }) =>
 
     function setResolution(program: WebGLProgram) {
       const loc = gl!.getUniformLocation(program, "iResolution");
-      if (loc) gl!.uniform3fv(loc, [canvas!.width, canvas!.height, 1]);
+      canvas!.width = window.visualViewport!.width;
+      canvas!.height = window.visualViewport!.height;
+      if (loc) gl!.uniform3fv(loc, [
+        window.visualViewport!.width,
+        window.visualViewport!.height,
+        1,
+      ]);
     }
 
     function setTime(program: WebGLProgram, now: number) {
@@ -191,7 +203,12 @@ export const ShaderBackground: React.FC<ShaderBackgroundProps> = ({ theme }) =>
 
     const ichannel1_texture = loadTexture(gl, "assets/small_noise.png");
 
-    gl!.viewport(0, 0, canvas!.width, canvas!.height);
+    gl!.viewport(
+      0,
+      0,
+      window.visualViewport!.width,
+      window.visualViewport!.height
+    );
 
     gl!.useProgram(finalProgram);
     setResolution(finalProgram!);
@@ -227,7 +244,6 @@ export const ShaderBackground: React.FC<ShaderBackgroundProps> = ({ theme }) =>
         top: 0,
         left: 0,
         zIndex: -1,
-        pointerEvents: "none",
       }}
     />
   );

frontend/src/assets/ball.glsl

@@ -0,0 +1,23 @@
+#version 300 es
+precision highp float;
+uniform vec3 iResolution;
+uniform float iTime;
+
+out vec4 FragColor;
+
+#define PALETTE vec3(9,4,0)
+
+void mainImage(out vec4 o, vec2 u) {
+    float n, i, s, t = iTime * .2, d, v;
+    vec3 q, p = iResolution, c;
+    u = (u + u - p.xy) / p.y;
+    vec2 l = u - (u.yx * .9 + .3 - vec2(-.35, .15));
+    for(; i++ < 5e1 && d < 5e1; d += s = min(q.y = .01 + .6 * abs(24. - length(q.xy)), v = max(s, dot(abs(fract(p) - .5), vec3(.04)))), c += (1. + cos(p.z + PALETTE)) / v + d * vec3(5, 2, 1) / q.y / 1e1 + 7. * vec3(3, 4, 1) / length(l)) for(q = p = vec3(u * d, d - 16.), s = length(p) - 8., p.xy *= mat2(cos(t + p.z * .6 + vec4(0, 33, 11, 0))), p += cos(t + p.zxy) + cos(t + p.yzx * s) / s / 4., p += .5 * cos(t + dot(cos(t + p), p) * p), n = .02; n < 2.; n *= 1.6) q.y -= abs(dot(sin(4. * t + .3 * q / n), q - q + n));
+
+    c = mix(c, c.yzx, smoothstep(2., .1, length(u) * 1.));
+    o.rgb = tanh(c * c / 6e7 / length(u - .3) + .1 * length(u));
+}
+
+void main() {
+    mainImage(FragColor, gl_FragCoord.xy);
+}

frontend/src/assets/react.svg

@@ -1 +0,0 @@
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