Black Hole (WebGL Shader)

Developer
Darryl Huffman
Size
5,663 Kb
Views
18,216
  1. Black Hole (WebGL Shader) Previews
  2. Black Hole (WebGL Shader) HTML Codes
  3. Black Hole (WebGL Shader) CSS Codes
  4. Black Hole (WebGL Shader) JS Codes

How do I make an black hole (webgl shader)?

Really glad to finally have this working as I'd like. This is a remake of one of my previous pens: https://codepen.io/darrylhuffman/pen/EWOJMW but this one is far more interactive. I hope you all enjoy!. What is a black hole (webgl shader)? How do you make a black hole (webgl shader)? This script and codes were developed by Darryl Huffman on 01 January 2023, Sunday.

Black Hole (WebGL Shader) Previews
IQ Test

Black Hole (WebGL Shader) - Script Codes HTML Codes

<!DOCTYPE html>
<html >
<head> <meta charset="UTF-8"> <title>Black Hole (WebGL Shader)</title> <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/meyer-reset/2.0/reset.min.css"> <link rel="stylesheet" href="css/style.css">
</head>
<body> <script id="2d-fragment-shader" type="x-shader/x-fragment">// <![CDATA[
// Look below at line 23 for realism.
#ifdef GL_ES
precision mediump float;
#endif
#define PI 3.14159265359
uniform sampler2D u_image;
varying vec2 v_texCoord;
uniform vec2 u_resolution;
uniform vec2 u_mouse;
uniform float u_mass;
uniform float u_time;
uniform float u_clickedTime;
vec2 rotate(vec2 mt, vec2 st, float angle){	float cos = cos((angle + u_clickedTime) * 1.0); // try replacing * 1.0 with * PI	float sin = sin(angle * 0.0); // try removing the * 0.0	// there are so many different cool effects that can be achieved by just messing with the cos and sin	// Uncomment these two lines for realism	//float cos = cos(angle) * (u_time * 0.3);	//float sin = sin(angle) * (u_time * 0.3);	float nx = (cos * (st.x - mt.x)) + (sin * (st.y - mt.y)) + mt.x;	float ny = (cos * (st.y - mt.y)) - (sin * (st.x - mt.x)) + mt.y;	return vec2(nx, ny);
}
void main() { vec2 st = gl_FragCoord.xy/u_resolution;	vec2 mt = u_mouse.xy/u_resolution;	float dx = st.x - mt.x;	float dy = st.y - mt.y;	float dist = sqrt(dx * dx + dy * dy);	float pull = u_mass / (dist * dist); vec3 color = vec3(0.0);	vec2 r = rotate(mt,st,pull);	vec4 imgcolor = texture2D(u_image, r);	color = vec3(	(imgcolor.x - (pull * 0.25)),	(imgcolor.y - (pull * 0.25)),	(imgcolor.z - (pull * 0.25))	); gl_FragColor = vec4(color,1.);
}
// ]]></script>
<script id="2d-vertex-shader" type="x-shader/x-vertex">// <![CDATA[	attribute vec2 a_position;	attribute vec2 a_texCoord;	varying vec2 v_texCoord;	void main() {	gl_Position = vec4(a_position, 0, 1);	v_texCoord = a_texCoord;	}	// ]]></script>
<canvas id="glscreen"></canvas> <script src='https://cdnjs.cloudflare.com/ajax/libs/jquery/3.1.1/jquery.min.js'></script>
<script src='https://darrylhuffman.com/bin/js/anim/images.js'></script> <script src="js/index.js"></script>
</body>
</html>

Black Hole (WebGL Shader) - Script Codes CSS Codes

html, body { position: absolute; top: 0px; left: 0px; right: 0px; bottom: 0px; padding: 0px; cursor: none; margin: 0px; overflow: hidden; display: flex; height: 100%; width: 100%; background-color: #000;
}
canvas { margin: auto auto;
}

Black Hole (WebGL Shader) - Script Codes JS Codes

// set up global javascript variables
var blackholeMass = 2000;
var curblackholeMass = 0;
var canvas, gl; // canvas and webgl context
var shaderScript;
var shaderSource;
var vertexShader; // Vertex shader. Not much happens in that shader, it just creates the vertex's to be drawn on
var fragmentShader; // this shader is where the magic happens. Fragment = pixel. Vertex = kind of like "faces" on a 3d model.
var buffer;
/* Variables holding the location of uniform variables in the WebGL. We use this to send info to the WebGL script. */
var locationOfTime;
var locationOfResolution;
var locationOfMouse;
var locationOfMass;
var locationOfclickedTime;
var originY = window.innerHeight, originX = window.innerWidth;
var mouse;
var startTime = new Date().getTime(); // Get start time for animating
var currentTime = 0;
var clicked = false, clickedTime = 0;
$(document).mousedown(function(){	clicked = true;
});
$(document).mouseup(function(){	clicked = false;
});
function init(image) {	// standard canvas setup here, except get webgl context	canvas = document.getElementById('glscreen');	gl = canvas.getContext('webgl') || canvas.getContext('experimental-webgl');	canvas.width = window.innerWidth >= window.innerHeight ? window.innerWidth : window.innerHeight;	canvas.height = window.innerWidth >= window.innerHeight ? window.innerWidth : window.innerHeight;	mouse = {x: originX/2, y: -(originY/2) + canvas.height, moved: false};	$(document).mousemove(function(e) {	mouse.x = e.pageX;	mouse.y = -e.pageY + canvas.height;	mouse.moved = true;	});	// give WebGL it's viewport	gl.viewport(0, 0, gl.drawingBufferWidth, gl.drawingBufferHeight);	// kind of back-end stuff	buffer = gl.createBuffer();	gl.bindBuffer(gl.ARRAY_BUFFER, buffer);	gl.bufferData(	gl.ARRAY_BUFFER,	new Float32Array([	-1.0, -1.0,	1.0, -1.0,	-1.0, 1.0,	-1.0, 1.0,	1.0, -1.0,	1.0, 1.0]),	gl.STATIC_DRAW	); // ^^ That up there sets up the vertex's used to draw onto. I think at least, I haven't payed much attention to vertex's yet, for all I know I'm wrong.	shaderScript = document.getElementById("2d-vertex-shader");	shaderSource = shaderScript.text;	vertexShader = gl.createShader(gl.VERTEX_SHADER); //create the vertex shader from script	gl.shaderSource(vertexShader, shaderSource);	gl.compileShader(vertexShader);	shaderScript = document.getElementById("2d-fragment-shader");	shaderSource = shaderScript.text;	fragmentShader = gl.createShader(gl.FRAGMENT_SHADER); //create the fragment from script	gl.shaderSource(fragmentShader, shaderSource);	gl.compileShader(fragmentShader);	program = gl.createProgram(); // create the WebGL program. This variable will be used to inject our javascript variables into the program.	gl.attachShader(program, vertexShader); // add the shaders to the program	gl.attachShader(program, fragmentShader); // ^^	gl.linkProgram(program); // Tell our WebGL application to use the program	gl.useProgram(program); // ^^ yep, but now literally use it.	/*	Alright, so here we're attatching javascript variables to the WebGL code. First we get the location of the uniform variable inside the program.	We use the gl.getUniformLocation function to do this, and pass thru the program variable we created above, as well as the name of the uniform variable in our shader.	*/	locationOfResolution = gl.getUniformLocation(program, "u_resolution");	locationOfMouse = gl.getUniformLocation(program, "u_mouse");	locationOfMass = gl.getUniformLocation(program, "u_mass");	locationOfTime = gl.getUniformLocation(program, "u_time");	locationOfclickedTime = gl.getUniformLocation(program, "u_clickedTime");	/*	Then we simply apply our javascript variables to the program.	Notice, it gets a bit tricky doing this. If you're editing a float value, gl.uniformf works.	But if we want to send over an array of floats, for example, we'd use gl.uniform2f. We're specifying that we are sending 2 floats at the end.	You can also send it over to the program as a vector, by using gl.uniform2fv.	To read up on all of the different gl.uniform** stuff, to send any variable you want, I'd recommend using the table (found on this site, but you need to scroll down about 300px)	https://webglfundamentals.org/webgl/lessons/webgl-shaders-and-glsl.html#uniforms	*/	gl.uniform2f(locationOfResolution, canvas.width, canvas.height);	gl.uniform2f(locationOfMouse, mouse.x, mouse.y);	gl.uniform1f(locationOfMass, curblackholeMass*0.00001);	gl.uniform1f(locationOfTime, currentTime);	gl.uniform1f(locationOfclickedTime, clickedTime);	var texCoordLocation = gl.getAttribLocation(program, "a_texCoord");	// provide texture coordinates for the rectangle.	var texCoordBuffer = gl.createBuffer();	gl.bindBuffer(gl.ARRAY_BUFFER, texCoordBuffer);	gl.bufferData(gl.ARRAY_BUFFER,	new Float32Array([	-1.0, -1.0,	1.0, -1.0,	-1.0, 1.0,	-1.0, 1.0,	1.0, -1.0,	1.0, 1.0]), gl.STATIC_DRAW);	gl.enableVertexAttribArray(texCoordLocation);	gl.vertexAttribPointer(texCoordLocation, 2, gl.FLOAT, false, 0, 0);	// Create a texture.	var texture = gl.createTexture();	gl.bindTexture(gl.TEXTURE_2D, texture);	// Set the parameters so we can render any size image.	gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);	gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);	gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);	gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);	// Upload the image into the texture.	gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, image);	render();
}
function render() {	var now = new Date().getTime();	currentTime = (now - startTime) / 1000; // update the current time for animations	if(curblackholeMass < blackholeMass - 50){	curblackholeMass += (blackholeMass-curblackholeMass) * 0.03;	}	if(clicked){	clickedTime += 0.03;	} else if(clickedTime > 0 && clicked == false) {	clickedTime += -(clickedTime*0.015);	}	if(mouse.moved == false){	mouse.y = (-(originY/2) + Math.sin(currentTime * 0.7) * ((originY * 0.25))) + canvas.height;	mouse.x = (originX/2) + Math.sin(currentTime * 0.6) * -(originX * 0.35);	}	gl.uniform1f(locationOfMass, curblackholeMass*0.00001);	gl.uniform2f(locationOfMouse, mouse.x, mouse.y);	gl.uniform1f(locationOfTime, currentTime); // update the time uniform in our shader	gl.uniform1f(locationOfclickedTime, clickedTime);	window.requestAnimationFrame(render, canvas); // request the next frame	positionLocation = gl.getAttribLocation(program, "a_position"); // do stuff for those vertex's	gl.enableVertexAttribArray(positionLocation);	gl.vertexAttribPointer(positionLocation, 2, gl.FLOAT, false, 0, 0);	gl.drawArrays(gl.TRIANGLES, 0, 6);
}
window.addEventListener('load', function(event){	var image = new Image();	image.src = spaceImage;	image.onload = function() {	init(image);	}
});
window.addEventListener('resize', function(event){	// just re-doing some stuff in the init here, to enable resizing.	canvas.width = window.innerWidth >= window.innerHeight ? window.innerWidth : window.innerHeight;	canvas.height = window.innerWidth >= window.innerHeight ? window.innerWidth : window.innerHeight;	gl.viewport(0, 0, canvas.width, canvas.height);	locationOfResolution = gl.getUniformLocation(program, "u_resolution");
});
Black Hole (WebGL Shader) - Script Codes
Black Hole (WebGL Shader) - Script Codes
Home Page Home
Developer Darryl Huffman
Username darrylhuffman
Uploaded January 01, 2023
Rating 4.5
Size 5,663 Kb
Views 18,216
Do you need developer help for Black Hole (WebGL Shader)?

Find the perfect freelance services for your business! Fiverr's mission is to change how the world works together. Fiverr connects businesses with freelancers offering digital services in 500+ categories. Find Developer!

Darryl Huffman (darrylhuffman) Script Codes
Name
Hot Arrrr Balloon.
A Different Clock
Spilled Galaxy
Orbit
Red Oak
Fur
BLACKHOLE - A Canvas Experiment
Followers Solar System
LightBulb
A Perfect Orbit
Create amazing SEO content with AI!

Jasper is the AI Content Generator that helps you and your team break through creative blocks to create amazing, original content 10X faster. Discover all the ways the Jasper AI Content Platform can help streamline your creative workflows. Start For Free!