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|
<!--Header-->
<head>
<title>Ma page WebGL</title>
<meta http-equiv="content-type" content="text/html; charset=windows-1252">
<script type="text/javascript" src="scripts/glMatrix-0.js"></script>
<script type="text/jscript" src="scripts/webgl-utils.js"></script>
<!--Style-->
<style type="text/css">
body
{
background-color: rgb(36,147,174);
}
</style>
<!--Shaders-->
<script id="shader-vs" type="x-shader/x-vertex">
attribute vec3 aVertexPosition;
attribute vec2 aTextureCoord;
uniform mat4 uMVMatrix;
uniform mat4 uPMatrix;
varying vec2 vTextureCoord;
void main (void) {
gl_Position = uPMatrix * uMVMatrix * vec4(aVertexPosition, 1.0);
vTextureCoord = aTextureCoord;
}
</script>
<script id="shader-fs" type="x-shader/x-fragment">
precision mediump float;
uniform sampler2D uSampler;
varying highp vec2 vTextureCoord;
void main(void) {
gl_FragColor = texture2D(uSampler, vTextureCoord);
}
</script>
<!--Scripts-->
<script type="text/javascript">
/*Variables*/
var gl;
var shaderProgram;
var mvMatrix = mat4.create();
var pMatrix = mat4.create();
var mvMatrixStack = [];
////////////////////////////////////
//Stack matrix function
function mvPushMatrix() {
var copy = mat4.create();
mat4.set(mvMatrix, copy);
mvMatrixStack.push(copy);
}
////////////////////////////////////
//Stack matrix function
function mvPopMatrix() {
if (mvMatrixStack.length == 0) {
throw "Invalid popMatrix!";
}
mvMatrix = mvMatrixStack.pop();
}
////////////////////////////////////
//WebGL initialisation
function initGL(canvas) {
gl = canvas.getContext("experimental-webgl");
gl.viewportWidth = canvas.width;
gl.viewportHeight = canvas.height;
if (!gl) {
alert("Couldn't initialise WebGL properly :(");
}
}
////////////////////////////////////
//Get shader function
function getShader(gl, id) {
var shaderScript = document.getElementById(id);
if (!shaderScript) {
return null;
}
var str = "";
var child = shaderScript.firstChild;
while (child) {
if (child.nodeType == 3) {
str += child.textContent;
}
child = child.nextSibling;
}
var shader;
if (shaderScript.type == "x-shader/x-vertex") {
shader = gl.createShader(gl.VERTEX_SHADER);
}
else if (shaderScript.type == "x-shader/x-fragment") {
shader = gl.createShader(gl.FRAGMENT_SHADER);
}
else {
return null;
}
gl.shaderSource(shader, str);
gl.compileShader(shader);
if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {
alert(gl.getShaderInfoLog(shader));
return null;
}
return shader;
}
////////////////////////////////////
//Shaders initialisation
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.textureCoordAttribute = gl.getAttribLocation(shaderProgram, "aTextureCoord");
gl.enableVertexAttribArray(shaderProgram.textureCoordAttribute);
shaderProgram.pMatrixUniform = gl.getUniformLocation(shaderProgram, "uPMatrix");
shaderProgram.mvMatrixUniform = gl.getUniformLocation(shaderProgram, "uMVMatrix");
shaderProgram.samplerUniform = gl.getUniformLocation(shaderProgram, "uSampler");
}
////////////////////////////////////
//Set matrix uniforms
function setMatrixUniforms() {
gl.uniformMatrix4fv(shaderProgram.pMatrixUniform, false, pMatrix);
gl.uniformMatrix4fv(shaderProgram.mvMatrixUniform, false, mvMatrix);
}
////////////////////////////////////
//Draw the scene
var cubeVertexPositionBuffer;
var cubeVertexTexCoordbuffer;
var cubeVertexIndexBuffer;
function initBuffers() {
////////////////////////////
//VERTEX
cubeVertexPositionBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, cubeVertexPositionBuffer);
var vertices = [
// Face avant
-1.0, -1.0, 1.0,
1.0, -1.0, 1.0,
1.0, 1.0, 1.0,
-1.0, 1.0, 1.0,
// Face arrière
-1.0, -1.0, -1.0,
-1.0, 1.0, -1.0,
1.0, 1.0, -1.0,
1.0, -1.0, -1.0,
// Face du dessus
-1.0, 1.0, -1.0,
-1.0, 1.0, 1.0,
1.0, 1.0, 1.0,
1.0, 1.0, -1.0,
// Face du dessous
-1.0, -1.0, -1.0,
1.0, -1.0, -1.0,
1.0, -1.0, 1.0,
-1.0, -1.0, 1.0,
// Face arrière
1.0, -1.0, -1.0,
1.0, 1.0, -1.0,
1.0, 1.0, 1.0,
1.0, -1.0, 1.0,
// Face gauche
-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.bufferData(gl.ARRAY_BUFFER, new Float32Array(vertices), gl.STATIC_DRAW);
cubeVertexPositionBuffer.itemSize = 3;
cubeVertexPositionBuffer.numItems = 24;
////////////////////////////
//COLOR
cubeVertexTexCoordbuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, cubeVertexTexCoordbuffer);
var texCoord = [
// Front face
0.0, 0.0,
1.0, 0.0,
1.0, 1.0,
0.0, 1.0,
// Back face
1.0, 0.0,
1.0, 1.0,
0.0, 1.0,
0.0, 0.0,
// Top face
0.0, 1.0,
0.0, 0.0,
1.0, 0.0,
1.0, 1.0,
// Bottom face
1.0, 1.0,
0.0, 1.0,
0.0, 0.0,
1.0, 0.0,
// Right face
1.0, 0.0,
1.0, 1.0,
0.0, 1.0,
0.0, 0.0,
// Left face
0.0, 0.0,
1.0, 0.0,
1.0, 1.0,
0.0, 1.0,
];
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(texCoord), gl.STATIC_DRAW);
cubeVertexTexCoordbuffer.itemSize = 2;
cubeVertexTexCoordbuffer.numImtems = 24;
////////////////////////////
//INDEX
cubeVertexIndexBuffer = gl.createBuffer();
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, cubeVertexIndexBuffer);
var cubeVertexIndices = [
0, 1, 2, 0, 2, 3, // Face avant
4, 5, 6, 4, 6, 7, // Face arrière
8, 9, 10, 8, 10, 11, // Face du dessus
12, 13, 14, 12, 14, 15, // Face du dessous
16, 17, 18, 16, 18, 19, // Face droite
20, 21, 22, 20, 22, 23 // Face gauche
]
gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, new Uint16Array(cubeVertexIndices), gl.STATIC_DRAW);
cubeVertexIndexBuffer.itemSize = 1;
cubeVertexIndexBuffer.numItems = 36;
}
////////////////////////////////////
//Draw the scene
var rotationTriangle = 0;
function drawScene() {
gl.viewport(0, 0, gl.viewportWidth, gl.viewportHeight);
gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
mat4.perspective(45, gl.viewportWidth / gl.viewportHeight, 0.1, 100.0, pMatrix);
mat4.identity(mvMatrix);
mat4.translate(mvMatrix, [0.0, 0.0, -5.0]);
mvPushMatrix();
mat4.rotate(mvMatrix, degToRad(rotationTriangle), [1, 1, 0]);
gl.bindBuffer(gl.ARRAY_BUFFER, cubeVertexPositionBuffer);
gl.vertexAttribPointer(shaderProgram.vertexPositionAttribute, cubeVertexPositionBuffer.itemSize, gl.FLOAT, false, 0, 0);
gl.bindBuffer(gl.ARRAY_BUFFER, cubeVertexTexCoordbuffer);
gl.vertexAttribPointer(shaderProgram.textureCoordAttribute, cubeVertexTexCoordbuffer.itemSize, gl.FLOAT, false, 0, 0);
gl.activeTexture(gl.TEXTURE0);
gl.bindTexture(gl.TEXTURE_2D, brickTexture);
gl.uniform1i(shaderProgram.samplerUniform, 0);
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, cubeVertexIndexBuffer);
setMatrixUniforms();
gl.drawElements(gl.TRIANGLES, cubeVertexIndexBuffer.numItems, gl.UNSIGNED_SHORT, 0);
mvPopMatrix();
}
////////////////////////////////////
//conversion function
function degToRad(degrees) {
return degrees * Math.PI / 180;
}
////////////////////////////////////
//upadte Animation
var lastTime = 0;
function updateAnimation() {
var timeNow = new Date().getTime();
if (lastTime != 0) {
var elapsed = timeNow - lastTime;
rotationTriangle += (90 * elapsed) / 1000.0;
}
lastTime = timeNow;
}
////////////////////////////////////
//tickfunction
function tick() {
requestAnimFrame(tick);
drawScene();
updateAnimation();
}
////////////////////////////////////
//Load the texture
var brickTexture;
function handleLoadtexture(image) {
brickTexture = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, brickTexture);
gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, true);
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.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, image);
}
////////////////////////////////////
//Init the texture
function initTextures() {
image = new Image();
image.src = "images/brick.jpg";
image.onload = function () {
handleLoadtexture(image)
}
}
////////////////////////////////////
//Entry point
function webGLStart() {
var canvas = document.getElementById("canvasWebGL");
initGL(canvas);
initShaders();
initBuffers();
initTextures();
gl.clearColor(0.14, 0.58, 0.68, 1.0);
gl.enable(gl.DEPTH_TEST);
tick();
}
</script>
</head> |
WebGL affichage de texture
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