mirror of
https://github.com/classilla/tenfourfox.git
synced 2024-09-28 20:56:36 +00:00
113 lines
3.3 KiB
HTML
113 lines
3.3 KiB
HTML
<!-- Any copyright is dedicated to the Public Domain.
|
|
http://creativecommons.org/publicdomain/zero/1.0/ -->
|
|
<!doctype html>
|
|
|
|
<html>
|
|
<head>
|
|
<meta charset="utf-8"/>
|
|
<title>WebGL editor test page</title>
|
|
|
|
<script id="shader-vs" type="x-shader/x-vertex">
|
|
precision lowp float;
|
|
attribute vec3 aVertexPosition;
|
|
|
|
void main(void) {
|
|
gl_Position = vec4(aVertexPosition, 1);
|
|
}
|
|
</script>
|
|
|
|
<script id="shader-fs" type="x-shader/x-fragment">
|
|
precision lowp float;
|
|
uniform vec3 uColor;
|
|
|
|
void main(void) {
|
|
gl_FragColor = vec4(uColor, 1);
|
|
}
|
|
</script>
|
|
</head>
|
|
|
|
<body>
|
|
<canvas id="canvas1" width="128" height="128"></canvas>
|
|
<canvas id="canvas2" width="128" height="128"></canvas>
|
|
|
|
<script type="text/javascript;version=1.8">
|
|
"use strict";
|
|
|
|
let canvas = [], gl = [];
|
|
let program = [];
|
|
let squareVerticesPositionBuffer = [];
|
|
let vertexPositionAttribute = [];
|
|
let colorUniform = [];
|
|
|
|
window.onload = function() {
|
|
for (let i = 0; i < 2; i++) {
|
|
canvas[i] = document.querySelector("#canvas" + (i + 1));
|
|
gl[i] = canvas[i].getContext("webgl", { preserveDrawingBuffer: true });
|
|
gl[i].clearColor(0.0, 0.0, 0.0, 1.0);
|
|
|
|
initProgram(i);
|
|
initBuffers(i);
|
|
drawScene(i);
|
|
}
|
|
}
|
|
|
|
function initProgram(i) {
|
|
let vertexShader = getShader(gl[i], "shader-vs");
|
|
let fragmentShader = getShader(gl[i], "shader-fs");
|
|
|
|
program[i] = gl[i].createProgram();
|
|
gl[i].attachShader(program[i], vertexShader);
|
|
gl[i].attachShader(program[i], fragmentShader);
|
|
gl[i].linkProgram(program[i]);
|
|
|
|
vertexPositionAttribute[i] = gl[i].getAttribLocation(program[i], "aVertexPosition");
|
|
gl[i].enableVertexAttribArray(vertexPositionAttribute[i]);
|
|
|
|
colorUniform[i] = gl[i].getUniformLocation(program[i], "uColor");
|
|
}
|
|
|
|
function getShader(gl, id) {
|
|
let script = document.getElementById(id);
|
|
let source = script.textContent;
|
|
let shader;
|
|
|
|
if (script.type == "x-shader/x-fragment") {
|
|
shader = gl.createShader(gl.FRAGMENT_SHADER);
|
|
} else if (script.type == "x-shader/x-vertex") {
|
|
shader = gl.createShader(gl.VERTEX_SHADER);
|
|
}
|
|
|
|
gl.shaderSource(shader, source);
|
|
gl.compileShader(shader);
|
|
|
|
return shader;
|
|
}
|
|
|
|
function initBuffers(i) {
|
|
squareVerticesPositionBuffer[i] = gl[i].createBuffer();
|
|
gl[i].bindBuffer(gl[i].ARRAY_BUFFER, squareVerticesPositionBuffer[i]);
|
|
gl[i].bufferData(gl[i].ARRAY_BUFFER, new Float32Array([
|
|
1.0, 1.0, 0.0,
|
|
-1.0, 1.0, 0.0,
|
|
1.0, -1.0, 0.0,
|
|
-1.0, -1.0, 0.0
|
|
]), gl[i].STATIC_DRAW);
|
|
}
|
|
|
|
function drawScene(i) {
|
|
gl[i].clear(gl[i].COLOR_BUFFER_BIT);
|
|
|
|
gl[i].bindBuffer(gl[i].ARRAY_BUFFER, squareVerticesPositionBuffer[i]);
|
|
gl[i].vertexAttribPointer(vertexPositionAttribute[i], 3, gl[i].FLOAT, false, 0, 0);
|
|
|
|
gl[i].useProgram(program[i]);
|
|
gl[i].uniform3fv(colorUniform[i], i == 0 ? [1, 1, 0] : [0, 1, 1]);
|
|
gl[i].drawArrays(gl[i].TRIANGLE_STRIP, 0, 4);
|
|
|
|
window.requestAnimationFrame(() => drawScene(i));
|
|
}
|
|
</script>
|
|
</body>
|
|
|
|
</html>
|