From 13d5c6d2b21565490fa5a43aee6fd9e373d90cd2 Mon Sep 17 00:00:00 2001
From: syuilo <4439005+syuilo@users.noreply.github.com>
Date: Mon, 22 Sep 2025 19:00:47 +0900
Subject: [PATCH] refactor MkAnimBg

---
 packages/frontend/src/components/MkAnimBg.vue | 76 +++++--------------
 1 file changed, 17 insertions(+), 59 deletions(-)

diff --git a/packages/frontend/src/components/MkAnimBg.vue b/packages/frontend/src/components/MkAnimBg.vue
index 19a21f6e24..0e1018dcbf 100644
--- a/packages/frontend/src/components/MkAnimBg.vue
+++ b/packages/frontend/src/components/MkAnimBg.vue
@@ -10,6 +10,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 <script lang="ts" setup>
 import { onMounted, onUnmounted, useTemplateRef } from 'vue';
 import isChromatic from 'chromatic/isChromatic';
+import { initShaderProgram } from '@/utility/webgl.js';
 
 const canvasEl = useTemplateRef('canvasEl');
 
@@ -21,47 +22,6 @@ const props = withDefaults(defineProps<{
 	focus: 1.0,
 });
 
-function loadShader(gl: WebGLRenderingContext, type: number, source: string) {
-	const shader = gl.createShader(type);
-	if (shader == null) return null;
-
-	gl.shaderSource(shader, source);
-	gl.compileShader(shader);
-
-	if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {
-		alert(
-			`falied to compile shader: ${gl.getShaderInfoLog(shader)}`,
-		);
-		gl.deleteShader(shader);
-		return null;
-	}
-
-	return shader;
-}
-
-function initShaderProgram(gl: WebGLRenderingContext, vsSource: string, fsSource: string) {
-	const vertexShader = loadShader(gl, gl.VERTEX_SHADER, vsSource);
-	const fragmentShader = loadShader(gl, gl.FRAGMENT_SHADER, fsSource);
-
-	const shaderProgram = gl.createProgram();
-	if (vertexShader == null || fragmentShader == null) return null;
-
-	gl.attachShader(shaderProgram, vertexShader);
-	gl.attachShader(shaderProgram, fragmentShader);
-	gl.linkProgram(shaderProgram);
-
-	if (!gl.getProgramParameter(shaderProgram, gl.LINK_STATUS)) {
-		alert(
-			`failed to init shader: ${gl.getProgramInfoLog(
-				shaderProgram,
-			)}`,
-		);
-		return null;
-	}
-
-	return shaderProgram;
-}
-
 let handle: ReturnType<typeof window['requestAnimationFrame']> | null = null;
 
 onMounted(() => {
@@ -71,7 +31,7 @@ onMounted(() => {
 	canvas.width = width;
 	canvas.height = height;
 
-	const maybeGl = canvas.getContext('webgl', { premultipliedAlpha: true });
+	const maybeGl = canvas.getContext('webgl2', { premultipliedAlpha: true });
 	if (maybeGl == null) return;
 
 	const gl = maybeGl;
@@ -82,18 +42,16 @@ onMounted(() => {
 	const positionBuffer = gl.createBuffer();
 	gl.bindBuffer(gl.ARRAY_BUFFER, positionBuffer);
 
-	const shaderProgram = initShaderProgram(gl, `
-		attribute vec2 vertex;
-
+	const shaderProgram = initShaderProgram(gl, `#version 300 es
+		in vec2 position;
 		uniform vec2 u_scale;
-
-		varying vec2 v_pos;
+		out vec2 in_uv;
 
 		void main() {
-			gl_Position = vec4(vertex, 0.0, 1.0);
-			v_pos = vertex / u_scale;
+			gl_Position = vec4(position, 0.0, 1.0);
+			in_uv = position / u_scale;
 		}
-	`, `
+	`, `#version 300 es
 		precision mediump float;
 
 		vec3 mod289(vec3 x) {
@@ -143,6 +101,7 @@ onMounted(() => {
 			return 130.0 * dot(m, g);
 		}
 
+		in vec2 in_uv;
 		uniform float u_time;
 		uniform vec2 u_resolution;
 		uniform float u_spread;
@@ -150,8 +109,7 @@ onMounted(() => {
 		uniform float u_warp;
 		uniform float u_focus;
 		uniform float u_itensity;
-
-		varying vec2 v_pos;
+		out vec4 out_color;
 
 		float circle( in vec2 _pos, in vec2 _origin, in float _radius ) {
 			float SPREAD = 0.7 * u_spread;
@@ -182,13 +140,13 @@ onMounted(() => {
 
 			float ratio = u_resolution.x / u_resolution.y;
 
-			vec2 uv = vec2( v_pos.x, v_pos.y / ratio ) * 0.5 + 0.5;
+			vec2 uv = vec2( in_uv.x, in_uv.y / ratio ) * 0.5 + 0.5;
 
 			vec3 color = vec3( 0.0 );
 
-			float greenMix = snoise( v_pos * 1.31 + u_time * 0.8 * 0.00017 ) * 0.5 + 0.5;
-			float purpleMix = snoise( v_pos * 1.26 + u_time * 0.8 * -0.0001 ) * 0.5 + 0.5;
-			float orangeMix = snoise( v_pos * 1.34 + u_time * 0.8 * 0.00015 ) * 0.5 + 0.5;
+			float greenMix = snoise( in_uv * 1.31 + u_time * 0.8 * 0.00017 ) * 0.5 + 0.5;
+			float purpleMix = snoise( in_uv * 1.26 + u_time * 0.8 * -0.0001 ) * 0.5 + 0.5;
+			float orangeMix = snoise( in_uv * 1.34 + u_time * 0.8 * 0.00015 ) * 0.5 + 0.5;
 
 			float alphaOne = 0.35 + 0.65 * pow( snoise( vec2( u_time * 0.00012, uv.x ) ) * 0.5 + 0.5, 1.2 );
 			float alphaTwo = 0.35 + 0.65 * pow( snoise( vec2( ( u_time + 1561.0 ) * 0.00014, uv.x ) ) * 0.5 + 0.5, 1.2 );
@@ -198,10 +156,10 @@ onMounted(() => {
 			color += vec3( circle( uv, vec2( 0.90 + cos( u_time * 0.000166 ) * 0.06, 0.42 + sin( u_time * 0.000138 ) * 0.06 ), 0.18 ) ) * alphaTwo * ( green * greenMix + purple * purpleMix );
 			color += vec3( circle( uv, vec2( 0.19 + sin( u_time * 0.000112 ) * 0.06, 0.25 + sin( u_time * 0.000192 ) * 0.06 ), 0.09 ) ) * alphaThree * ( orange * orangeMix );
 
-			color *= u_itensity + 1.0 * pow( snoise( vec2( v_pos.y + u_time * 0.00013, v_pos.x + u_time * -0.00009 ) ) * 0.5 + 0.5, 2.0 );
+			color *= u_itensity + 1.0 * pow( snoise( vec2( in_uv.y + u_time * 0.00013, in_uv.x + u_time * -0.00009 ) ) * 0.5 + 0.5, 2.0 );
 
 			vec3 inverted = vec3( 1.0 ) - color;
-			gl_FragColor = vec4( color, max(max(color.x, color.y), color.z) );
+			out_color = vec4(color, max(max(color.x, color.y), color.z));
 		}
 	`);
 	if (shaderProgram == null) return;
@@ -223,7 +181,7 @@ onMounted(() => {
 	gl.uniform1f(u_itensity, 0.5);
 	gl.uniform2fv(u_scale, [props.scale, props.scale]);
 
-	const vertex = gl.getAttribLocation(shaderProgram, 'vertex');
+	const vertex = gl.getAttribLocation(shaderProgram, 'position');
 	gl.enableVertexAttribArray(vertex);
 	gl.vertexAttribPointer(vertex, 2, gl.FLOAT, false, 0, 0);