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<!DOCTYPE html>
<html>
<head>
<title>Shader Startup Benchmark</title>
<meta http-equiv="content-type" content="text/html; charset=ISO-8859-1">
<script type="text/javascript" src="glMatrix-0.9.5.min.js"></script>
<script type="text/javascript" src="webgl-utils.js"></script>
<script type="text/javascript" src="webgl-helpers.js"></script>
<script type="text/javascript" src="httpAjax.js"></script>
<script id="shader-fs" type="x-shader/x-fragment">
precision mediump float;
uniform vec2 iResolution;
uniform float iGlobalTime;
void main(void) {
vec2 uv = gl_FragCoord.xy / iResolution.xy;
gl_FragColor = vec4(uv, 0.5 + 0.5 * sin(iGlobalTime), 1.0);
}
</script>
<script id="shader-vs" type="x-shader/x-vertex">
attribute vec3 aVertexPosition;
uniform mat4 uMVMatrix;
uniform mat4 uPMatrix;
varying vec4 vColor;
void main(void) {
gl_Position = uPMatrix * uMVMatrix * vec4(aVertexPosition, 1.0);
}
</script>
<script type="text/javascript">
function initShaders() {
var fragmentShader = getShader(gl, "shader-fs");
var vertexShader = getShader(gl, "shader-vs");
shaderProgram = gl.createProgram();
gl.attachShader(shaderProgram, vertexShader);
gl.attachShader(shaderProgram, fragmentShader);
gl.linkProgram(shaderProgram);
if (!gl.getProgramParameter(shaderProgram, gl.LINK_STATUS)) {
alert("Could not initialise shaders");
}
gl.useProgram(shaderProgram);
shaderProgram.vertexPositionAttribute = gl.getAttribLocation(shaderProgram, "aVertexPosition");
gl.enableVertexAttribArray(shaderProgram.vertexPositionAttribute);
shaderProgram.pMatrixUniform = gl.getUniformLocation(shaderProgram, "uPMatrix");
shaderProgram.mvMatrixUniform = gl.getUniformLocation(shaderProgram, "uMVMatrix");
shaderProgram.iResolutionUniform = gl.getUniformLocation(shaderProgram, "iResolution");
shaderProgram.iGlobalTimeUniform = gl.getUniformLocation(shaderProgram, "iGlobalTime");
}
var squareVertexPositionBuffer;
function initBuffers() {
squareVertexPositionBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, squareVertexPositionBuffer);
vertices = [
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.bufferData(gl.ARRAY_BUFFER, new Float32Array(vertices), gl.STATIC_DRAW);
squareVertexPositionBuffer.itemSize = 3;
squareVertexPositionBuffer.numItems = 4;
}
function drawScene() {
gl.uniform2f(shaderProgram.iResolutionUniform, gl.viewportWidth, gl.viewportHeight);
gl.uniform1f(shaderProgram.iGlobalTimeUniform, timecount);
gl.viewport(0, 0, gl.viewportWidth, gl.viewportHeight);
gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
mat4.ortho(-1, 1, -1, 1, -1, 1, pMatrix);
mat4.identity(mvMatrix);
gl.bindBuffer(gl.ARRAY_BUFFER, squareVertexPositionBuffer);
gl.vertexAttribPointer(shaderProgram.vertexPositionAttribute, squareVertexPositionBuffer.itemSize, gl.FLOAT, false, 0, 0);
gl.uniformMatrix4fv(shaderProgram.pMatrixUniform, false, pMatrix);
gl.uniformMatrix4fv(shaderProgram.mvMatrixUniform, false, mvMatrix);
gl.drawArrays(gl.TRIANGLE_STRIP, 0, squareVertexPositionBuffer.numItems);
}
var lastTime = 0;
function animate() {
var timeNow = new Date().getTime();
if (lastTime != 0) {
var elapsed = timeNow - lastTime;
}
lastTime = timeNow;
updatefps(elapsed, "fps");
sendbenchmark(8.0, "Startup Screenaligned");
}
function tick() {
requestAnimFrame(tick);
drawScene();
animate();
}
function webGLStart(canvas) {
var canvas = document.getElementById(canvas);
initGL(canvas);
initShaders();
initBuffers();
gl.clearColor(0.0, 0.0, 0.0, 1.0);
gl.enable(gl.DEPTH_TEST);
tick();
}
</script>
</head>
<body onload="genID('Startup Screenaligned'); webGLStart('canvas');">
<canvas id="canvas" style="border: none;" width="400" height="400"></canvas>
<div id="fps"></div>
</body>
</html>
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