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basic mechanics

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biglyderv 2025-03-04 05:04:38 -05:00
commit 2c842d5b0f
Signed by: biglyderv
GPG key ID: 0E2EB0B4CD7397B5
4 changed files with 216 additions and 0 deletions
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<title>WebGL Demo</title>
<script id="vertex-shader-2d" type="notjs">
// an attribute will receive data from a buffer
attribute vec4 a_position;
varying vec4 b_position;
uniform mat4 mat_thing;
// all shaders have a main function
void main() {
// gl_Position is a special variable a vertex shader
// is responsible for setting
gl_Position = a_position * mat_thing;
b_position = a_position;
}
</script>
<script id="fragment-shader-2d" type="notjs">
// fragment shaders don't have a default precision so we need
// to pick one. mediump is a good default
precision mediump float;
varying vec4 b_position;
uniform float size_thing;
uniform float dist_thing;
void main() {
// gl_FragColor is a special variable a fragment shader
// is responsible for setting
float dist = (log(distance(b_position.xy,vec2(0.0))) - size_thing) / log(2.0) * 0.1;
gl_FragColor = vec4((mod(dist,0.1) - 0.1 + 0.1 * dist_thing) * 50.0 * vec3(1,1,1),1); // return redish-purple
}
</script>
<script src="/js/twgl.min.js" type="module"></script>
<script src="/js/index.js" type="module"></script>
<link rel="stylesheet" href="main.css">
</head>
<body>
<canvas id="c" width="640" height="480"></canvas>
<div class='hud'>
hud
</div>
</body>
</html>

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'use strict';
var nothingness = 1, nGain = 0.01; //todo: outsource into another file
var canvas, gl, positionAttributeLocation, positionBuffer, matBuffer, sizeBuffer, distBuffer
function createShader(gl, type, source) {
var shader = gl.createShader(type);
gl.shaderSource(shader, source);
gl.compileShader(shader);
var success = gl.getShaderParameter(shader, gl.COMPILE_STATUS);
if (success) {
return shader;
}
console.log(gl.getShaderInfoLog(shader));
gl.deleteShader(shader);
}
function createProgram(gl, vertexShader, fragmentShader) {
var program = gl.createProgram();
gl.attachShader(program, vertexShader);
gl.attachShader(program, fragmentShader);
gl.linkProgram(program);
var success = gl.getProgramParameter(program, gl.LINK_STATUS);
if (success) {
return program;
}
console.log(gl.getProgramInfoLog(program));
gl.deleteProgram(program);
}
function main() {
// Get A WebGL context
canvas = document.querySelector("#c");
gl = canvas.getContext("webgl");
if (!gl) {
return;
}
var vertexShaderSource = document.querySelector("#vertex-shader-2d").text;
var fragmentShaderSource = document.querySelector("#fragment-shader-2d").text;
var vertexShader = createShader(gl, gl.VERTEX_SHADER, vertexShaderSource);
var fragmentShader = createShader(gl, gl.FRAGMENT_SHADER, fragmentShaderSource);
var program = createProgram(gl, vertexShader, fragmentShader);
positionAttributeLocation = gl.getAttribLocation(program, "a_position");
matBuffer = gl.getUniformLocation(program, "mat_thing");
sizeBuffer = gl.getUniformLocation(program, "size_thing");
distBuffer = gl.getUniformLocation(program, "dist_thing");
positionBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, positionBuffer);
gl.useProgram(program);
// Tell the attribute how to get data out of positionBuffer (ARRAY_BUFFER)
var size = 2; // 2 components per iteration
var type = gl.FLOAT; // the data is 32bit floats
var normalize = false; // don't normalize the data
var stride = 0; // 0 = move forward size * sizeof(type) each iteration to get the next position
var offset = 0; // start at the beginning of the buffer
gl.vertexAttribPointer(
positionAttributeLocation, size, type, normalize, stride, offset);
// draw
renderThing();
}
function renderThing() {
twgl.resizeCanvasToDisplaySize(gl.canvas);
gl.viewport(0, 0, gl.canvas.width, gl.canvas.height);
gl.clearColor(0, 0, 0, 0);
gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
var ratio = gl.canvas.width / gl.canvas.height;
var ratioA = Math.max(ratio, 1);
var ratioB = ratioA / ratio;
var positions = [
-1, -1,
-1, 1,
1, 1,
-1, -1,
1, -1,
1, 1
];
gl.enableVertexAttribArray(positionAttributeLocation);
gl.bindBuffer(gl.ARRAY_BUFFER, positionBuffer);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(positions), gl.STATIC_DRAW);
gl.uniformMatrix4fv(matBuffer, false, new Float32Array([
ratioB, 0, 0, 0,
0, ratioA, 0, 0,
0, 0, 1, 0,
0, 0, 0, 1
]));
hud.textContent = `${Math.floor(nothingness * 100) / 100} nothings; ${Math.floor(nGain * 60 * 100) / 100} nil/sec`
gl.uniform1f(sizeBuffer, -Math.log(nothingness));
gl.uniform1f(distBuffer, 0.1 + nGain / (nothingness+10));
var primitiveType = gl.TRIANGLES;
var offset = 0;
var count = 6;
gl.drawArrays(primitiveType, offset, count);
requestAnimationFrame(renderThing)
}
let hud = document.querySelector('.hud');
main();
requestAnimationFrame(renderThing)
let clicking = false;
document.body.onclick = async function() {
if (clicking) return;
clicking = true;
let oldNGain = nGain;
nGain += 0.05;
while (nGain > oldNGain) {
nGain -= 0.005;
nothingness += nGain;
await new Promise((res) => setTimeout(res,1000 / 60))
}
nGain = oldNGain;
clicking = false;
}

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canvas {
width: 100vw;
height: 100vh;
}
body, html {
margin: 0;
padding: 0;
}
.hud {
position: fixed;
top: 0;
left: 0;
background: rgba(255, 255, 255, 0.7);
color: rgb(0, 0, 0);
font-family: monospace;
padding: 10px;
min-width: 200px;
min-height: 50px;
font-size: 32px;
}