1.0.2 • Published 2 years ago
tc_glu v1.0.2
What is this?
WebGL utility functions.
Installation
npm i tc_glu --save
or
<script src="https://cdn.jsdelivr.net/npm/tc_glu@latest/gl_utilities.js"></script>index.html:
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<script src="https://cdn.jsdelivr.net/npm/tc_glu@latest/gl_utilities.js"></script>
<title>WebGl Shader Boilerplate</title>
<style>
*,
*::after,
*::before {
box-sizing: border-box;
padding: 0;
margin: 0;
}
body {
background-color: #373f36;
overflow: hidden;
}
#gl {
width: 100%;
height: 100vh;
}
</style>
</head>
<body>
<div id="gl"></div>
<script type="module" src="./app.js"></script>
</body>
</html>app.js:
import shaders from './shaders.js'
const container = document.querySelector('#gl')
const canvas = document.createElement('canvas')
canvas.width = window.innerWidth
canvas.height = window.innerHeight
container.appendChild(canvas)
const gl = canvas.getContext('webgl2')
const program = TC_GLU.createProgram(gl, shaders.vertex(), shaders.fragment())
TC_GLU.setUni(gl, program, 'resolution', [canvas.width, canvas.height])
TC_GLU.setUni(gl, program, 'ratio', devicePixelRatio)
TC_GLU.initVerts(gl)
TC_GLU.initAttrib(gl, program)
TC_GLU.draw(gl, program, canvas)shaders.js:
export default{
vertex(){
return`#version 300 es
#ifdef GL_ES
precision mediump float;
#endif
out vec2 vv;
in vec2 a_position;
void main(){
vv=a_position;
gl_Position=vec4(a_position*2.-1.,0,1);
}
`
},
fragment(){
return`#version 300 es
#ifdef GL_ES
precision mediump float;
#endif
uniform vec2 resolution;
uniform float ratio;
out vec4 color;
void main(){
vec2 uv=2.*(ratio*gl_FragCoord.xy-.5*resolution.xy)/resolution.y;
float c=smoothstep(.3,.29,length(uv));
color=vec4(vec3(c),c);
}`
},
}