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94:T347a,[V0_FILE]typescriptreact:file="TweetGLSLVisualization.tsx" isFixed="true" isQuickEdit="true" "use client" import type React from "react" import { useRef, useEffect } from "react" /** * TweetGLSLVisualization Component * * A React component that renders a WebGL visualization based on the つぶやきGLSL code * by Yohei Nishitsuji (https://x.com/YoheiNishitsuji/status/1898687974914904342) * * The visualization uses ray marching techniques to render a 3D Mandelbox-like fractal * with interactive mouse controls for rotation with inertia. */ const TweetGLSLVisualization: React.FC = () => { const canvasRef = useRef(null) useEffect(() => { let program: WebGLProgram | null = null let vertexShader: WebGLShader | null = null let fragmentShader: WebGLShader | null = null let positionBuffer: WebGLBuffer | null = null let gl: WebGL2RenderingContext | null = null const canvas = canvasRef.current if (!canvas) return // Get WebGL2 context gl = canvas.getContext("webgl2") if (!gl) { console.error("WebGL2 not supported") return } // Resize canvas to full screen const resizeCanvas = () => { canvas.width = window.innerWidth canvas.height = window.innerHeight gl.viewport(0, 0, canvas.width, canvas.height) } resizeCanvas() window.addEventListener("resize", resizeCanvas) // Vertex shader source - minimal pass-through shader const vertexShaderSource = `#version 300 es precision highp float; in vec4 a_position; void main() { gl_Position = a_position; } ` // Fragment shader source with detailed technical explanations const fragmentShaderSource = `#version 300 es precision highp float; out vec4 outColor; uniform vec2 u_resolution; // Screen resolution uniform vec2 u_mouse; // Mouse position uniform float u_time; // Time in seconds uniform float u_rotationX; // Rotation influence from mouse X with inertia uniform float u_rotationY; // Rotation intensity from mouse Y with inertia uniform float u_colorShift; // Color shift based on vertical mouse position // 2D rotation matrix function // Used for rotating points around the origin in the XZ plane mat2 rotate2D(float angle) { float s = sin(angle); float c = cos(angle); return mat2(c, -s, s, c); } // HSV to RGB color conversion // h: hue [0,1], s: saturation [0,1], v: value/brightness [0,1] // This is a common color space transformation used in computer graphics // to create smooth color gradients and transitions vec3 hsv(float h, float s, float v) { vec4 t = vec4(1.0, 2.0/3.0, 1.0/3.0, 3.0); vec3 p = abs(fract(vec3(h) + t.xyz) * 6.0 - vec3(t.w)); return v * mix(vec3(t.x), clamp(p - vec3(t.x), 0.0, 1.0), s); } void main() { // Initialize variables vec2 r = u_resolution; // Screen resolution vec2 FC = gl_FragCoord.xy; // Current fragment coordinates float t = u_time; // Time vec4 o = vec4(0, 0, 0, 1); // Output color (initially black) // Main rendering loop - this accumulates color contributions // This is a form of path tracing/ray marching where we accumulate // color values over multiple iterations (99 in this case) for(float i=0.,g=0.,e=0.,s=0.;++i<99.;){ // Create initial ray position // This transforms screen coordinates to 3D space coordinates // The division by r.x ensures aspect ratio correction // g is used as a depth accumulator that evolves through iterations vec3 p=vec3((FC.xy*2.-r)/r.x+vec2(0,.9),g-.5); // Apply rotation to the XZ plane // This creates the spinning/rotating effect in the visualization // Using inertia-based rotation values passed from JavaScript float rotationAngle = t * 0.2 + u_rotationX * u_rotationY; p.xz*=rotate2D(rotationAngle); // Initialize scale factor for the fractal s=1.; // Distance Estimated Fractal - This is a form of ray marching // This loop implements a 3D Mandelbox-like fractal with folding operations // The technique uses Distance Estimation (DE) for rendering complex fractals // by iteratively transforming the point and tracking how quickly it escapes for(int i=0;i++<16;p=vec3(3,9,2.5)-abs(abs(p)*e-vec3(5,2,3)/e)) // Scale factor accumulation // The dot product measures how quickly points escape in the fractal // This is similar to an escape-time fractal algorithm but with distance estimation // The dot product creates a spherical distance field that determines detail level s*=e=max(1.005,10./dot(p*.8,p)); // Accumulate distance field contribution // This creates the layered effect in the visualization // The modulo operation creates repeating patterns based on distance // This is not traditional FBM (Fractional Brownian Motion) noise, but rather // a distance-based pattern derived from the fractal iterations g+=mod(length(p.zx),p.y)/s; // Calculate color intensity based on logarithmic scale factor // This creates the glowing effect where the fractal boundaries are brightest // The logarithm compresses the high dynamic range of the scale factor s=log(s)/g; // Accumulate color using HSV color space // The negative values create complementary colors // The division by 5e3 (5000) scales the intensity to a visible range // This creates the characteristic glow and color banding of the visualization o.rgb+=hsv(-g + u_colorShift,-p.y*.2,s/5e3); } // Output final accumulated color outColor = o; } ` // Create and compile shaders const createShader = (gl: WebGL2RenderingContext, type: number, source: string) => { const shader = gl.createShader(type) if (!shader) { console.error("Failed to create shader") return null } gl.shaderSource(shader, source) gl.compileShader(shader) if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS)) { console.error("Shader compilation error:", gl.getShaderInfoLog(shader)) gl.deleteShader(shader) return null } return shader } let cleanup = () => {} try { vertexShader = createShader(gl, gl.VERTEX_SHADER, vertexShaderSource) fragmentShader = createShader(gl, gl.FRAGMENT_SHADER, fragmentShaderSource) if (!vertexShader || !fragmentShader) { cleanup = () => { window.removeEventListener("resize", resizeCanvas) } return } // Create program and link shaders program = gl.createProgram() if (!program) { console.error("Failed to create program") cleanup = () => { window.removeEventListener("resize", resizeCanvas) } return } gl.attachShader(program, vertexShader) gl.attachShader(program, fragmentShader) gl.linkProgram(program) if (!gl.getProgramParameter(program, gl.LINK_STATUS)) { console.error("Program linking error:", gl.getProgramInfoLog(program)) cleanup = () => { window.removeEventListener("resize", resizeCanvas) } return } // Set up position buffer (full screen quad) positionBuffer = gl.createBuffer() gl.bindBuffer(gl.ARRAY_BUFFER, positionBuffer) const positions = [-1, -1, 1, -1, -1, 1, -1, 1, 1, -1, 1, 1] gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(positions), gl.STATIC_DRAW) // Use program gl.useProgram(program) // Set up position attribute const positionAttributeLocation = gl.getAttribLocation(program, "a_position") gl.enableVertexAttribArray(positionAttributeLocation) gl.vertexAttribPointer(positionAttributeLocation, 2, gl.FLOAT, false, 0, 0) // Get uniform locations const resolutionUniformLocation = gl.getUniformLocation(program, "u_resolution") const mouseUniformLocation = gl.getUniformLocation(program, "u_mouse") const timeUniformLocation = gl.getUniformLocation(program, "u_time") const rotationXUniformLocation = gl.getUniformLocation(program, "u_rotationX") const rotationYUniformLocation = gl.getUniformLocation(program, "u_rotationY") const colorShiftUniformLocation = gl.getUniformLocation(program, "u_colorShift") // Mouse tracking with inertia let mouseX = 0 let mouseY = 0 let prevMouseX = 0 let prevMouseY = 0 let velocityX = 0 let velocityY = 0 let targetRotationX = 0 let currentRotationX = 0 let targetRotationY = 0.5 let currentRotationY = 0.5 let isMouseMoving = false let lastMouseMoveTime = 0 const inertiaFactor = 0.95 // How quickly the inertia decays (0-1) const mouseSensitivity = 0.003 // How sensitive the rotation is to mouse movement const handleMouseMove = (event: MouseEvent) => { prevMouseX = mouseX prevMouseY = mouseY mouseX = event.clientX mouseY = event.clientY // Calculate velocity based on mouse movement velocityX = (mouseX - prevMouseX) * mouseSensitivity velocityY = (mouseY - prevMouseY) * mouseSensitivity // Update target rotation based on normalized mouse position targetRotationX += velocityX targetRotationY = Math.max(0.1, Math.min(1.0, mouseY / canvas.height)) isMouseMoving = true lastMouseMoveTime = Date.now() } window.addEventListener("mousemove", handleMouseMove) // Render loop const startTime = Date.now() const render = () => { if (!gl || !program) return const currentTime = Date.now() const deltaTime = (currentTime - startTime) / 1000 // Check if mouse has stopped moving if (isMouseMoving && currentTime - lastMouseMoveTime > 100) { isMouseMoving = false } // Apply inertia to rotation if (!isMouseMoving) { // Gradually reduce velocity when mouse is not moving velocityX *= inertiaFactor // Apply velocity to target rotation targetRotationX += velocityX // Stop when velocity becomes very small if (Math.abs(velocityX) < 0.0001) { velocityX = 0 } } // Smooth interpolation for rotation values currentRotationX += (targetRotationX - currentRotationX) * 0.1 currentRotationY += (targetRotationY - currentRotationY) * 0.1 // Update time uniform gl.uniform1f(timeUniformLocation, deltaTime) // Update resolution uniform gl.uniform2f(resolutionUniformLocation, canvas.width, canvas.height) // Update mouse uniform gl.uniform2f(mouseUniformLocation, mouseX, canvas.height - mouseY) // Update rotation uniforms with inertia values gl.uniform1f(rotationXUniformLocation, currentRotationX) gl.uniform1f(rotationYUniformLocation, currentRotationY) // Update color shift uniform based on normalized mouse Y position gl.uniform1f(colorShiftUniformLocation, currentRotationY * 2.0) // Clear canvas and draw gl.clearColor(0, 0, 0, 1) gl.clear(gl.COLOR_BUFFER_BIT) gl.drawArrays(gl.TRIANGLES, 0, 6) requestAnimationFrame(render) } render() // Cleanup cleanup = () => { window.removeEventListener("resize", resizeCanvas) window.removeEventListener("mousemove", handleMouseMove) if (program) gl.deleteProgram(program) if (vertexShader) gl.deleteShader(vertexShader) if (fragmentShader) gl.deleteShader(fragmentShader) if (positionBuffer) gl.deleteBuffer(positionBuffer) } } catch (error) { console.error("Error during WebGL initialization or rendering:", error) cleanup = () => { window.removeEventListener("resize", resizeCanvas) } } return () => { cleanup() } }, []) return ( <>

Move mouse horizontally to control rotation with inertia
Move mouse vertically to change colors

@Yohei Nishitsuji

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