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basic_texture.html
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basic_texture.html
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<!doctype html>
<html>
<head>
<title>Basic Texture</title>
<style>
body{ background-color: black; }
canvas{ background-color: white; }
</style>
<script src="http://code.jquery.com/jquery-1.7.1.min.js"></script>
<script src="D:\Documents\PENS\Semester 5\Pengantar Grafika Komputer\WebGL\beginningwebgl-master\lib\raf_polyfill.js"></script>
<script src="D:\Documents\PENS\Semester 5\Pengantar Grafika Komputer\WebGL\beginningwebgl-master\lib\gl-matrix-min.js"></script>
<script>
var gl = null,
canvas = null,
glProgram = null,
fragmentShader = null,
vertexShader = null;
var vertexPositionAttribute = null,
trianglesVerticeBuffer = null;
var texture = null,
textureImage = null;
function loadTexture()
{
textureImage = new Image();
textureImage.src = "smiley-128px.png";
function setupTexture()
{
texture = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, texture);
gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, true);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, textureImage);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
if( !gl.isTexture(texture) )
{
console.error("Error: Texture is invalid");
}
//gl.generateMipmap(gl.TEXTURE_2D);
glProgram.samplerUniform = gl.getUniformLocation(glProgram, "uSampler");
gl.uniform1i(glProgram.samplerUniform, 0);
}
function initWebGL()
{
canvas = document.getElementById("my-canvas");
try{
gl = canvas.getContext("webgl") || canvas.getContext("experimental-webgl");
}catch(e){
}
if(gl)
{
initShaders();
setupBuffers();
loadTexture();
textureImage.onload = function() {
setupTexture();
setupWebGL();
drawScene();
}
}else{
alert( "Error: Your browser does not appear to support WebGL.");
}
}
function setupWebGL()
{
//set the clear color to a shade of green
gl.clearColor(0.1, 0.5, 0.1, 1.0);
gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
gl.enable(gl.DEPTH_TEST);
gl.viewport(0, 0, canvas.height, canvas.height);
}
function initShaders()
{
//get shader sources with jQuery Ajax
$.ajax({
async: false,
url: './basic-texture.vs',
success: function (data) {
vs_source = data.firstChild.textContent;
},
dataType: 'xml'
});
$.ajax({
async: false,
url: './basic-texture.fs',
success: function (data) {
fs_source = data.firstChild.textContent;
},
dataType: 'xml'
});
//compile shaders
vertexShader = makeShader(vs_source, gl.VERTEX_SHADER);
fragmentShader = makeShader(fs_source, gl.FRAGMENT_SHADER);
//create program
glProgram = gl.createProgram();
//attach and link shaders to the program
gl.attachShader(glProgram, vertexShader);
gl.attachShader(glProgram, fragmentShader);
gl.linkProgram(glProgram);
if (!gl.getProgramParameter(glProgram, gl.LINK_STATUS)) {
alert("Unable to initialize the shader program.");
}
//use program
gl.useProgram(glProgram);
}
function makeShader(src, type)
{
//compile the vertex shader
var shader = gl.createShader(type);
gl.shaderSource(shader, src);
gl.compileShader(shader);
if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {
alert("Error compiling shader: " + gl.getShaderInfoLog(shader));
}
return shader;
}
function setupBuffers()
{
var triangleVertices = [
-0.5, -0.5, 0.0,
0.5, -0.5, 0.0,
0.5, 0.5, 0.0,
0.5, 0.5, 0.0,
-0.5, 0.5, 0.0,
-0.5, -0.5, 0.0
];
trianglesVerticeBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, trianglesVerticeBuffer);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(triangleVertices), gl.STATIC_DRAW);
}
function drawScene()
{
vertexPositionAttribute = gl.getAttribLocation(glProgram, "aVertexPosition");
gl.enableVertexAttribArray(vertexPositionAttribute);
gl.bindBuffer(gl.ARRAY_BUFFER, trianglesVerticeBuffer);
gl.vertexAttribPointer(vertexPositionAttribute, 3, gl.FLOAT, false, 0, 0);
gl.drawArrays(gl.TRIANGLES, 0, 2*3);
}
</script>
</head>
<body onload="initWebGL()">
<canvas id="my-canvas" width="400" height="300">
Your browser does not support the HTML5 canvas element.
</canvas>
</body>
</html>