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<!DOCTYPE html>
<html>
<head>
<title>Canvas3d example</title>
<script src="resources/CanvasMatrix.js"> </script>
<script src="resources/utils3d.js"> </script>
<script id="vshader" type="x-shader/x-vertex">
uniform mat4 u_modelViewMatrix;
uniform mat4 u_modelViewProjMatrix;
uniform mat4 u_normalMatrix;
uniform vec3 lightDir;
attribute vec3 vNormal;
attribute vec4 vTexCoord;
attribute vec4 vPosition;
varying float v_Dot;
varying vec2 v_texCoord;
void main()
{
gl_Position = u_modelViewProjMatrix * vPosition;
v_texCoord = vTexCoord.st;
vec4 transNormal = u_normalMatrix * vec4(vNormal,1);
v_Dot = max(dot(transNormal.xyz, lightDir), 0.0);
}
</script>
<script id="fshader" type="x-shader/x-fragment">
uniform sampler2D sampler2d;
varying float v_Dot;
varying vec2 v_texCoord;
void main()
{
vec4 color = texture2D(sampler2d,v_texCoord);
color += vec4(0.1,0.1,0.1,1);
gl_FragColor = vec4(color.xyz * v_Dot, color.a);
}
</script>
<script>
function init()
{
var gl = initWebGL("example", "vshader", "fshader",
[ "vNormal", "vTexCoord", "vPosition"],
[ 0, 0, 0, 1 ], 10000);
gl.uniform3f(gl.getUniformLocation(gl.program, "lightDir"), 0, 0, 1);
gl.uniform1i(gl.getUniformLocation(gl.program, "sampler2d"), 0);
gl.enable(gl.TEXTURE_2D);
gl.sphere = makeSphere(gl, 1, 30, 30);
// get the images
earthTexture = loadImageTexture(gl, "resources/earthmap1k.jpg");
marsTexture = loadImageTexture(gl, "resources/mars500x250.png");
return gl;
}
width = -1;
height = -1;
function reshape(ctx)
{
var canvas = document.getElementById('example');
if (canvas.clientWidth == width && canvas.clientHeight == height)
return;
width = canvas.clientWidth;
height = canvas.clientHeight;
ctx.viewport(0, 0, width, height);
ctx.perspectiveMatrix = new CanvasMatrix4();
ctx.perspectiveMatrix.lookat(0,0,6, 0, 0, 0, 0, 1, 0);
ctx.perspectiveMatrix.perspective(30, width/height, 1, 10000);
}
function drawOne(ctx, angle, x, y, z, scale, texture)
{
// setup VBOs
ctx.enableVertexAttribArray(0);
ctx.enableVertexAttribArray(1);
ctx.enableVertexAttribArray(2);
ctx.bindBuffer(ctx.ARRAY_BUFFER, ctx.sphere.vertexObject);
ctx.vertexAttribPointer(2, 3, ctx.FLOAT, false, 0, 0);
ctx.bindBuffer(ctx.ARRAY_BUFFER, ctx.sphere.normalObject);
ctx.vertexAttribPointer(0, 3, ctx.FLOAT, false, 0, 0);
ctx.bindBuffer(ctx.ARRAY_BUFFER, ctx.sphere.texCoordObject);
ctx.vertexAttribPointer(1, 2, ctx.FLOAT, false, 0, 0);
ctx.bindBuffer(ctx.ELEMENT_ARRAY_BUFFER, ctx.sphere.indexObject);
// generate the model-view matrix
var mvMatrix = new CanvasMatrix4();
mvMatrix.scale(scale, scale, scale);
mvMatrix.rotate(angle, 0,1,0);
mvMatrix.rotate(30, 1,0,0);
mvMatrix.translate(x,y,z);
ctx.uniformMatrix4fv(ctx.getUniformLocation(ctx.program, "u_modelViewMatrix"), false, mvMatrix.getAsCanvasFloatArray());
// construct the normal matrix from the model-view matrix
var normalMatrix = new CanvasMatrix4(mvMatrix);
normalMatrix.invert();
normalMatrix.transpose();
ctx.uniformMatrix4fv(ctx.getUniformLocation(ctx.program, "u_normalMatrix"), false, normalMatrix.getAsCanvasFloatArray());
// construct the model-view * projection matrix
var mvpMatrix = new CanvasMatrix4(mvMatrix);
mvpMatrix.multRight(ctx.perspectiveMatrix);
ctx.uniformMatrix4fv(ctx.getUniformLocation(ctx.program, "u_modelViewProjMatrix"), false, mvpMatrix.getAsCanvasFloatArray());
ctx.bindTexture(ctx.TEXTURE_2D, texture);
ctx.drawElements(ctx.TRIANGLES, ctx.sphere.numIndices, ctx.UNSIGNED_SHORT, 0);
}
function drawPicture(ctx)
{
reshape(ctx);
ctx.clear(ctx.COLOR_BUFFER_BIT | ctx.DEPTH_BUFFER_BIT);
drawOne(ctx, currentAngle, -1, 0, 0, 1, earthTexture);
drawOne(ctx, -currentAngle, 1, 0, 0, 0.6, marsTexture);
ctx.flush();
framerate.snapshot();
currentAngle += incAngle;
if (currentAngle > 360)
currentAngle -= 360;
}
function start()
{
var ctx = init();
currentAngle = 0;
incAngle = 0.2;
var f = function() { drawPicture(ctx) };
setInterval(f, 10);
framerate = new Framerate("framerate");
}
</script>
<style type="text/css">
canvas {
border: 2px solid black;
width:90%;
height:90%;
}
</style>
</head>
<body onload="start()">
<canvas id="example">
There is supposed to be an example drawing here, but it's not important.
</canvas>
<div id="framerate"></div>
<div id="console"></div>
</body>
</html>
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