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<!DOCTYPE html> | |
<html> | |
<head> | |
<meta charset="utf-8"> | |
<meta http-equiv="X-UA-Compatible" content="IE=edge"> | |
<meta name="viewport" content="width=device-width, initial-scale=1"> | |
<title></title> | |
</head> | |
<body> | |
<canvas width="512" height="512"></canvas> | |
<script type="x-shader/x-vertex" id="vertex-shader"> | |
#version 100 | |
void main() { | |
gl_Position = vec4(0.0, 0.0, 0.0, 1.0); | |
gl_PointSize = 64.0; | |
} | |
</script> | |
<script type="x-shader/x-fragment" id="fragment-shader"> | |
#version 100 | |
precision highp float; | |
void main() { | |
gl_FragColor = vec4(1.0, 0.54, 0.34, 1.0); | |
} | |
</script> | |
<script> | |
var gl = init_gl(document.querySelector("canvas")); | |
var vs_src = document.querySelector("#vertex-shader").innerHTML; | |
var vs = gl.createShader(gl.VERTEX_SHADER); | |
gl.shaderSource(vs, vs_src); | |
gl.compileShader(vs); | |
var fs_src = document.querySelector("#fragment-shader").innerHTML; | |
var fs = gl.createShader(gl.FRAGMENT_SHADER); | |
gl.shaderSource(fs, fs_src); | |
gl.compileShader(fs); | |
var program = gl.createProgram(); | |
gl.attachShader(program, vs); | |
gl.attachShader(program, fs); | |
gl.linkProgram(program); | |
gl.detachShader(program, vs); | |
gl.detachShader(program, fs); | |
gl.deleteShader(vs); | |
gl.deleteShader(fs); | |
if (!gl.getProgramParameter(program, gl.LINK_STATUS)) { | |
// Clean | |
gl.useProgram(null); | |
gl.deleteProgram(program); | |
console.log("Error: " + gl.getProgramInfoLog(program)); | |
//return; | |
} | |
gl.enableVertexAttribArray(0); | |
var buf = gl.createBuffer(); | |
gl.bindBuffer(gl.ARRAY_BUFFER, buf); | |
gl.vertexAttribPointer(0, 1, gl.FLOAT, false, 0, 0); | |
gl.useProgram(program); | |
gl.drawArrays(gl.POINTS, 0, 1); | |
// Clean | |
//gl.useProgram(null); | |
//gl.deleteBuffer(buf); | |
//gl.deleteProgram(program); | |
function init_gl(c) { | |
var gl = c.getContext("webgl"); | |
c.width = c.clientWidth; | |
c.height = c.clientHeight; | |
gl.viewport(0, 0, gl.drawingBufferWidth, gl.drawingBufferHeight); | |
gl.clearColor(0.0, 0.0, 0.0, 1.0); | |
gl.clear(gl.COLOR_BUFFER_BIT); | |
return gl; | |
} | |
</script> | |
</body> | |
</html> |
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