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<!DOCTYPE html>
<head>
<meta charset="utf-8"/>
<title>Пирамидите в Гиза</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);
// gl_Position = vec4(aXYZ, 1);
}
</script>
<script id="fshader" type="x-shader/x-fragment">
precision mediump float;
uniform vec3 uColor;
void main( )
{
gl_FragColor = vec4(uColor,1);
}
</script>
<script>
function pyramid(position, width)
{
identity();
translate(position); scale([width / 2, width / 2, width / 2]);
translate([0, 0, -1]); useMatrix();
gl.drawArrays(gl.LINE_LOOP, 0, 3);
translate([0, 0, 2]); yRotate(180); useMatrix();
gl.drawArrays(gl.LINE_LOOP, 0, 3);
translate([-1, 0, 1]); yRotate(90); useMatrix();
gl.drawArrays(gl.LINE_LOOP, 0, 3);
translate([0, 0, 2]); yRotate(180); useMatrix();
gl.drawArrays(gl.LINE_LOOP, 0, 3);
}
function start( )
{
gl = getContext("picasso");
glprog = getProgram("vshader","fshader");
aXYZ = gl.getAttribLocation(glprog,"aXYZ");
uColor = gl.getUniformLocation(glprog,"uColor");
uProjectionMatrix = gl.getUniformLocation(glprog,"uProjectionMatrix");
uViewMatrix = gl.getUniformLocation(glprog,"uViewMatrix");
uModelMatrix = gl.getUniformLocation(glprog,"uModelMatrix");
gl.clearColor(1,1,1,1);
gl.clear(gl.COLOR_BUFFER_BIT);
var proj = perspMatrix(30,gl.canvas.width/gl.canvas.height,1,40000);
gl.uniformMatrix4fv(uProjectionMatrix,false,proj);
var view = [ 0, 22, 1]; // отгоре
view = [-8, 9, 15]; // отстрани
view = viewMatrix(view, [0,0,0], [0,1,0]);
gl.uniformMatrix4fv(uViewMatrix,false,view);
// околна стена на пирамида
var data = [
-1, 0, 0,
1, 0, 0,
0, 1.5, 1,
];
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);
// черни пирамиди
gl.uniform3f(uColor,0,0,0);
// Долу ляво
pyramid([-3.84, 0, 3.54], 0.95);
pyramid([-4.41, 0, 4.50], 0.37);
pyramid([-3.94, 0, 4.50], 0.37);
pyramid([-3.47, 0, 4.50], 0.37);
// Център
pyramid([-1, 0, -0.36], 2.12);
pyramid([-1, 0, 1.07], 0.21);
// Горе дясно
pyramid([2.07, 0, -3.92], 2.3);
pyramid([3.99, 0, -3.54], 0.45);
pyramid([3.99, 0, -3.01], 0.45);
pyramid([3.99, 0, -2.48], 0.45);
pyramid([3.50, 0, -2.72], 0.23);
}
</script>
</head>
<body onload="start()">
<h2>Пирамидите в Гиза</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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