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<!DOCTYPE html>
<head>
<meta charset="utf-8"/>
<title>Въртящи се кубове по ръбовете</title>
<script src="webgl-fmi.js"></script>
<script id="vshader" type="x-shader/x-vertex">
uniform mat4 uProjectionMatrix;
uniform mat4 uViewMatrix;
uniform mat4 uModelMatrix;
attribute vec3 aXYZ;
void main ()
{
gl_Position = uProjectionMatrix * uViewMatrix * uModelMatrix * vec4(aXYZ,1);
}
</script>
<script id="fshader" type="x-shader/x-fragment">
void main( )
{
gl_FragColor = vec4(1,0,0,1);
}
</script>
<script>
function start( )
{
var canvas = document.getElementById("picasso");
//canvas = WebGLDebugUtils.makeLostContextSimulatingCanvas(canvas);
canvas.addEventListener('webglcontextlost',function(event){event.preventDefault();},false);
canvas.addEventListener('webglcontextrestored',function(){init();},false);
init();
drawFrame();
}
function init()
{
gl = getContext("picasso",false);
glprog = getProgram("vshader","fshader");
aXYZ = gl.getAttribLocation(glprog,"aXYZ");
uProjectionMatrix = gl.getUniformLocation(glprog,"uProjectionMatrix");
uViewMatrix = gl.getUniformLocation(glprog,"uViewMatrix");
uModelMatrix = gl.getUniformLocation(glprog,"uModelMatrix");
gl.clearColor(1,1,1,1);
perspective(30,gl.canvas.width/gl.canvas.height,1,40000);
// куб 1x1x1
var data = [ 0.5,-0.5,0.5, // предна стена
0.5,0.5,0.5,
-0.5,0.5,0.5,
-0.5,-0.5,0.5,
0.5,-0.5,-0.5, // задна стена
0.5,0.5,-0.5,
-0.5,0.5,-0.5,
-0.5,-0.5,-0.5,
0.5,-0.5,0.5, // десни хоризонтални ръбове
0.5,-0.5,-0.5,
0.5,0.5,0.5,
0.5,0.5,-0.5,
-0.5,0.5,0.5, // леви хоризонтални ръбове
-0.5,0.5,-0.5,
-0.5,-0.5,0.5,
-0.5,-0.5,-0.5 ];
var buf = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER,buf);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(data), gl.STATIC_DRAW);
gl.enableVertexAttribArray(aXYZ);
gl.vertexAttribPointer(aXYZ,3,gl.FLOAT,false,0,0);
}
var frame = 0;
function drawCube()
{
useMatrix();
gl.drawArrays(gl.LINE_LOOP,0,4);
gl.drawArrays(gl.LINE_LOOP,4,4);
gl.drawArrays(gl.LINES,8,8);
}
function drawFrame()
{
frame++;
gl.clear(gl.COLOR_BUFFER_BIT);
lookAt([3*Math.cos(frame/100),3*Math.sin(frame/100),1], [0,0,-0.1], [0,0,1]);
// главен куб
identity();
drawCube(frame);
// кубчета по вертикалните ръбове
for (var i=0; i<4; i++)
{
pushMatrix();
zRotate(90*i);
translate([0.5,0.5,0]);
scale([0.1,0.1,0.1]);
drawCube();
popMatrix();
}
// кубчета по горните ръбове
for (var i=0; i<4; i++)
{
pushMatrix();
zRotate(90*i);
translate([0.5,0,0.5]);
scale([0.1,0.1,0.1]);
if (i % 2 == 0) {
yRotate(frame);
translate([(i == 0) ? 0.5 : -0.5, 0, (i == 0) ? 0.5 : -0.5]);
} else {
xRotate(frame);
translate([0, (i == 1) ? 0.5 : -0.5, (i == 1) ? 0.5 : -0.5]);
}
drawCube();
popMatrix();
}
// кубчета по долните ръбове
for (var i=0; i<4; i++)
{
pushMatrix();
zRotate(90*i);
translate([0.5,0,-0.5]);
scale([0.1,0.1,0.1]);
drawCube();
popMatrix();
}
requestAnimationFrame(drawFrame);
}
</script>
</head>
<body onload="start()">
<h2>Въртящи се кубове по ръбовете</h2>
<noscript>
Искаме JavaScript, но няма!
</noscript>
<canvas id="picasso" width="600" height="400" style="border: solid;">
Искаме canvas, но няма!
</canvas>
</body>
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