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<!--
SPDX-FileCopyrightText: syuilo and misskey-project
SPDX-License-Identifier: AGPL-3.0-only
-->
<template>
<canvas ref="canvasEl" style="display: block; width: 100%; height: 100%; pointer-events: none;"></canvas>
</template>
<script lang="ts" setup>
import { onMounted, onUnmounted, useTemplateRef } from 'vue';
import isChromatic from 'chromatic/isChromatic';
import { GLSL_LIB_SNOISE, initShaderProgram } from '@/utility/webgl.js';
const VERTEX_SHADER = `#version 300 es
in vec2 position;
out vec2 in_uv;
void main() {
in_uv = (position + 1.0) / 2.0;
gl_Position = vec4(position, 0.0, 1.0);
}
`;
const FRAGMENT_SHADER = `#version 300 es
precision mediump float;
const float PI = 3.141592653589793;
const float TWO_PI = 6.283185307179586;
const float HALF_PI = 1.5707963267948966;
${GLSL_LIB_SNOISE}
in vec2 in_uv;
uniform vec2 in_resolution;
uniform float u_scale;
uniform float u_time;
uniform float u_seed;
uniform float u_angle;
uniform float u_radius;
uniform vec3 u_color;
out vec4 out_color;
void main() {
float x_ratio = min(in_resolution.x / in_resolution.y, 1.0);
float y_ratio = min(in_resolution.y / in_resolution.x, 1.0);
float size = 1.0 / u_scale;
float size_half = size / 2.0;
float angle = -(u_angle * PI);
vec2 centeredUv = (in_uv - vec2(0.5, 0.5)) * vec2(x_ratio, y_ratio);
vec2 rotatedUV = vec2(
centeredUv.x * cos(angle) - centeredUv.y * sin(angle),
centeredUv.x * sin(angle) + centeredUv.y * cos(angle)
);
vec2 uv = rotatedUV;
float modX = mod(uv.x, size);
float modY = mod(uv.y, size);
vec2 pixelated_uv = vec2(
(size * (floor((uv.x - 0.5 - size) / size) + 0.5)),
(size * (floor((uv.y - 0.5 - size) / size) + 0.5))
) + vec2(0.5 + size, 0.5 + size);
float time = u_time * 0.00025;
float noiseAScale = 1.0;
float noiseAX = (pixelated_uv.x + u_seed) * (u_scale / noiseAScale);
float noiseAY = (pixelated_uv.y + u_seed) * (u_scale / noiseAScale);
float noiseA = snoise(vec3(noiseAX, noiseAY, time * 2.0));
float noiseBScale = 32.0;
float noiseBX = (pixelated_uv.x + u_seed) * (u_scale / noiseBScale);
float noiseBY = (pixelated_uv.y + u_seed) * (u_scale / noiseBScale);
float noiseB = snoise(vec3(noiseBX, noiseBY, time));
float strength = 0.0;
strength += noiseA * 0.2;
strength += noiseB * 0.8;
float opacity = min(max(strength, 0.0), 1.0);
float threshold = ((u_radius / 2.0) / u_scale);
if (length(vec2(modX - size_half, modY - size_half)) < threshold) {
out_color = vec4(u_color.r, u_color.g, u_color.b, opacity);
return;
}
out_color = vec4(0.0, 0.0, 0.0, 0.0);
}
`;
const canvasEl = useTemplateRef('canvasEl');
const props = withDefaults(defineProps<{
scale?: number;
}>(), {
scale: 48,
});
let handle: ReturnType<typeof window['requestAnimationFrame']> | null = null;
onMounted(() => {
const canvas = canvasEl.value!;
let width = canvas.offsetWidth;
let height = canvas.offsetHeight;
canvas.width = width;
canvas.height = height;
const maybeGl = canvas.getContext('webgl2', { preserveDrawingBuffer: false, alpha: true, premultipliedAlpha: false, antialias: true });
if (maybeGl == null) return;
const gl = maybeGl;
const VERTICES = new Float32Array([-1, -1, -1, 1, 1, 1, -1, -1, 1, 1, 1, -1]);
const vertexBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, vertexBuffer);
gl.bufferData(gl.ARRAY_BUFFER, VERTICES, gl.STATIC_DRAW);
//gl.clearColor(0.0, 0.0, 0.0, 0.0);
//gl.clear(gl.COLOR_BUFFER_BIT);
const shaderProgram = initShaderProgram(gl, VERTEX_SHADER, FRAGMENT_SHADER);
gl.useProgram(shaderProgram);
const positionLocation = gl.getAttribLocation(shaderProgram, 'position');
gl.vertexAttribPointer(positionLocation, 2, gl.FLOAT, false, 0, 0);
gl.enableVertexAttribArray(positionLocation);
const in_resolution = gl.getUniformLocation(shaderProgram, 'in_resolution');
gl.uniform2fv(in_resolution, [canvas.width, canvas.height]);
const u_time = gl.getUniformLocation(shaderProgram, 'u_time');
const u_seed = gl.getUniformLocation(shaderProgram, 'u_seed');
const u_scale = gl.getUniformLocation(shaderProgram, 'u_scale');
const u_angle = gl.getUniformLocation(shaderProgram, 'u_angle');
const u_radius = gl.getUniformLocation(shaderProgram, 'u_radius');
const u_color = gl.getUniformLocation(shaderProgram, 'u_color');
gl.uniform1f(u_seed, Math.random() * 1000);
gl.uniform1f(u_scale, props.scale);
gl.uniform1f(u_angle, 0.0);
gl.uniform1f(u_radius, 0.15);
gl.uniform3fv(u_color, [0.5, 1.0, 0]);
if (isChromatic()) {
gl.uniform1f(u_time, 0);
gl.drawArrays(gl.TRIANGLES, 0, 6);
} else {
function render(timeStamp: number) {
let sizeChanged = false;
if (Math.abs(height - canvas.offsetHeight) > 2) {
height = canvas.offsetHeight;
canvas.height = height;
sizeChanged = true;
}
if (Math.abs(width - canvas.offsetWidth) > 2) {
width = canvas.offsetWidth;
canvas.width = width;
sizeChanged = true;
}
if (sizeChanged && gl) {
gl.uniform2fv(in_resolution, [width, height]);
gl.viewport(0, 0, width, height);
}
gl.uniform1f(u_time, timeStamp);
gl.drawArrays(gl.TRIANGLES, 0, 6);
handle = window.requestAnimationFrame(render);
}
handle = window.requestAnimationFrame(render);
}
});
onUnmounted(() => {
if (handle) {
window.cancelAnimationFrame(handle);
}
// TODO: WebGLリソースの解放
});
</script>
<style lang="scss" module>
</style>
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