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trex.html
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trex.html
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<!DOCTYPE HTML>
<html lang="en">
<head>
<title>gl.blendFuncSeparate()</title>
<meta charset="utf-8">
<link rel="stylesheet" href="styles/style.css">
<style type="text/css">
h1 { color: #fff; }
</style>
</head>
<body>
<!-- code adapted from http://mrdoob.com/lab/javascript/webgl/blending/blendfuncseparate.html
give all the credits to him ;) -->
<div class="uppertext" style="margin-top: -50px">Click to start animation</div>
<div id="effect"></div>
<div id="name" style="z-index: 1000000">By <a href="http://twitter.com/karlwestin">twitter.com/karlwestin</a></div>
<h1 id="start" >Screen</h1>
<script src="gl-matrix.js"></script>
<script id="vs" type="x-shader/x-vertex">
attribute vec3 position;
attribute vec2 aTextureCoord;
uniform mat4 uMVMatrix;
varying mediump vec2 vTextureCoord;
void main() {
gl_Position = uMVMatrix * vec4( position, 1.0 );
vTextureCoord = aTextureCoord;
}
</script>
<script id="fs" type="x-shader/x-fragment">
varying mediump vec2 vTextureCoord;
uniform sampler2D texture;
void main( void ) {
gl_FragColor = texture2D(texture, vec2(vTextureCoord.s, vTextureCoord.t)).rgba;
}
</script>
<script type="text/javascript">
window.requestAnimFrame = (function(){
return window.requestAnimationFrame ||
window.webkitRequestAnimationFrame ||
window.mozRequestAnimationFrame ||
window.oRequestAnimationFrame ||
window.msRequestAnimationFrame ||
function( callback ){
window.setTimeout(callback, 1000 / 60);
};
})();
var mvMatrixStack = [],
mvMatrix = mat4.create();
function mvPushMatrix() {
var copy = mat4.create();
mat4.set(mvMatrix, copy);
mvMatrixStack.push(copy);
}
function mvPopMatrix() {
if (mvMatrixStack.length == 0) {
throw "Invalid popMatrix!";
}
mvMatrix = mvMatrixStack.pop();
}
var effectDiv, sourceDiv, canvas, gl, buffer, textureBuffer,
vertex_shader, fragment_shader, currentProgram,
vertexPositionLocation, texture1, texture2, textureLocation,
parameters = { screenWidth: 0, screenHeight: 0 },
equations, functions;
init();
function init() {
vertex_shader = document.getElementById( 'vs' ).textContent;
fragment_shader = document.getElementById( 'fs' ).textContent;
effectDiv = document.getElementById( 'effect' );
canvas = document.createElement( 'canvas' );
effectDiv.appendChild( canvas );
// Initialise WebGL
function throwOnGLError(err, funcName, args) {
throw WebGLDebugUtils.glEnumToString(err) + " was caused by call to" + funcName;
};
try {
gl = canvas.getContext( 'experimental-webgl' );
//gl = WebGLDebugUtils.makeDebugContext(canvas.getContext("experimental-webgl"), throwOnGLError);
gl.enable( gl.DEPTH_TEST );
gl.depthFunc( gl.LEQUAL );
gl.enable( gl.BLEND );
gl.pixelStorei( gl.UNPACK_FLIP_Y_WEBGL, true );
} catch( error ) { }
if ( !gl ) {
alert("WebGL not supported");
throw "cannot create webgl context";
}
// Create Vertex buffer (2 triangles)
buffer = gl.createBuffer();
gl.bindBuffer( gl.ARRAY_BUFFER, buffer );
gl.bufferData( gl.ARRAY_BUFFER, new Float32Array( [
- 1.0, - 1.0, 1.0,
- 1.0, - 1.0, 1.0,
1.0, - 1.0, 1.0,
1.0, - 1.0, 1.0
] ), gl.STATIC_DRAW );
// Create Texture Buffer
textureBuffer = gl.createBuffer();
gl.bindBuffer( gl.ARRAY_BUFFER, textureBuffer );
gl.bufferData( gl.ARRAY_BUFFER, new Float32Array( [
1.0, 1.0,
0.0, 1.0,
1.0, 0.0,
0.0, 1.0,
0.0, 0.0,
1.0, 0.0
] ), gl.STATIC_DRAW );
// Create Program
currentProgram = createProgram( vertex_shader, fragment_shader );
texture1 = loadTexture( 'pics/trex.png' );
texture2 = loadTexture( 'pics/circle.png' );
onWindowResize();
window.addEventListener( 'resize', onWindowResize, false );
}
function onWindowResize( event ) {
canvas.width = 1300;
canvas.height = 1300;
parameters.screenWidth = canvas.width;
parameters.screenHeight = canvas.height;
gl.viewport( 0, 0, canvas.width, canvas.height );
}
function loadTexture( path ) {
var texture = gl.createTexture();
var image = new Image();
image.onload = function() {
gl.enable( gl.TEXTURE_2D );
gl.bindTexture( gl.TEXTURE_2D, texture );
gl.texImage2D( gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, image );
gl.texParameteri( gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR );
gl.texParameteri( gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR_MIPMAP_NEAREST );
gl.texParameteri( gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE );
gl.texParameteri( gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE );
gl.generateMipmap( gl.TEXTURE_2D );
gl.bindTexture( gl.TEXTURE_2D, null );
update();
};
image.src = path;
return texture;
}
function createProgram( vertex, fragment ) {
var program = gl.createProgram();
var vs = createShader( vertex, gl.VERTEX_SHADER );
var fs = createShader( '#ifdef GL_ES\nprecision highp float;\n#endif\n\n' + fragment, gl.FRAGMENT_SHADER );
if ( vs == null || fs == null ) return null;
gl.attachShader( program, vs );
gl.attachShader( program, fs );
gl.deleteShader( vs );
gl.deleteShader( fs );
gl.linkProgram( program );
if ( !gl.getProgramParameter( program, gl.LINK_STATUS ) ) {
alert( "ERROR:\n" +
"VALIDATE_STATUS: " + gl.getProgramParameter( program, gl.VALIDATE_STATUS ) + "\n" +
"ERROR: " + gl.getError() + "\n\n" +
"- Vertex Shader -\n" + vertex + "\n\n" +
"- Fragment Shader -\n" + fragment );
return null;
}
program.mvMatrix = gl.getUniformLocation(program, "uMVMatrix");
return program;
}
function createShader( src, type ) {
var shader = gl.createShader( type );
gl.shaderSource( shader, src );
gl.compileShader( shader );
if ( !gl.getShaderParameter( shader, gl.COMPILE_STATUS ) ) {
alert( ( type == gl.VERTEX_SHADER ? "VERTEX" : "FRAGMENT" ) + " SHADER:\n" + gl.getShaderInfoLog( shader ) );
return null;
}
return shader;
}
function update() {
render();
}
function render(val) {
val || (val = 0);
var factor = Math.sin(val);
if ( !currentProgram ) return;
gl.clear( gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT );
// Load program into GPU
gl.useProgram( currentProgram );
// Get var locations
vertexPositionLocation = gl.getAttribLocation( currentProgram, 'position' );
textureLocation = gl.getUniformLocation( currentProgram, 'texture' );
textureCoordAttribute = gl.getAttribLocation(currentProgram, 'aTextureCoord');
// Render geometry
gl.enableVertexAttribArray(textureCoordAttribute);
gl.enableVertexAttribArray( vertexPositionLocation );
gl.bindBuffer( gl.ARRAY_BUFFER, buffer );
gl.vertexAttribPointer( vertexPositionLocation, 2, gl.FLOAT, false, 0, 0 );
mat4.identity(mvMatrix);
mat4.scale(mvMatrix, [0.4, 0.4, 0.4]);
mvPushMatrix();
mat4.translate(mvMatrix, [factor*2,0,0])
gl.uniformMatrix4fv(currentProgram.mvMatrix, false, mvMatrix);
gl.bindBuffer( gl.ARRAY_BUFFER, textureBuffer);
gl.vertexAttribPointer(textureCoordAttribute, 2, gl.FLOAT, false, 0, 0);
//gl.disableVertexAttribArray( vertexPositionLocation );
gl.activeTexture( gl.TEXTURE0 );
gl.bindTexture( gl.TEXTURE_2D, texture1 );
gl.uniform1i( textureLocation, 0 );
gl.bindBuffer( gl.ARRAY_BUFFER, buffer );
gl.drawArrays( gl.TRIANGLES, 0, 6 );
gl.blendEquationSeparate( gl.FUNC_ADD, gl.FUNC_ADD );
gl.blendFuncSeparate( gl.SRC_ALPHA, gl.SRC_COLOR, gl.ONE_MINUS_CONSTANT_COLOR, gl.DST_COLOR );
gl.bindTexture( gl.TEXTURE_2D, texture2 );
// Render geometry
mvPopMatrix();
mvPushMatrix();
gl.uniformMatrix4fv(currentProgram.mvMatrix, false, mvMatrix);
gl.bindBuffer( gl.ARRAY_BUFFER, buffer );
gl.vertexAttribPointer( vertexPositionLocation, 2, gl.FLOAT, false, 0, 0 );
gl.enableVertexAttribArray( vertexPositionLocation );
gl.drawArrays( gl.TRIANGLES, 0, 6 );
gl.disableVertexAttribArray( vertexPositionLocation );
mvPopMatrix();
}
var r = 0;
function animloop() {
requestAnimFrame(animloop);
render(r+=0.01);
//setTimeout(animloop, 1000);
};
document.body.onclick = animloop;
</script>
</body>
</html>