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<!DOCTYPE html>
<head>
<meta charset="utf-8"/>
<title>Мрежа</title>
<script src="webgl-fmi.js"></script>
<script id="vshader" type="x-shader/x-vertex">
attribute vec2 aXY;
void main ()
{
gl_Position = vec4(aXY,0,1);
gl_PointSize = 10.0;
}
</script>
<script id="fshader" type="x-shader/x-fragment">
void main( )
{
gl_FragColor = vec4(0,0,0,1);
}
</script>
<script>
function start( )
{
gl = getContext("picasso");
glprog = getProgram("vshader","fshader");
aXY = gl.getAttribLocation(glprog,"aXY");
gl.clearColor(1,1,1,1);
gl.clear(gl.COLOR_BUFFER_BIT);
var n = 18;
var m = 15;
const vSpacing = 2 / m;
const hSpacing = 2 / n;
var points = [];
for (var row = 1; row <= m; row++) {
var evenRowOffset = (row % 2 == 0) ? -hSpacing / 2 : 0;
for (var col = 1 + (1 - row % 2); col <= n; col++)
points.push(col * hSpacing - 1 - hSpacing / 2 + evenRowOffset, row * vSpacing - 1 - vSpacing / 2);
}
var vertexBuf = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, vertexBuf);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(points), gl.STATIC_DRAW);
gl.vertexAttribPointer(aXY, 2, gl.FLOAT, false, 0, 0);
gl.enableVertexAttribArray(aXY);
gl.drawArrays(gl.POINTS, 0, n * m - Math.floor(m / 2));
}
</script>
</head>
<body onload="start()">
<h2>Мрежа</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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