1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
|
/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/
#define M_PI 3.1415926535897932384626433832795
uniform float time;
uniform sampler2D permTexture;
attribute vec2 center;
attribute int tileXIndex;
attribute int tileYIndex;
attribute int vertexIndexInTile;
varying vec2 v_texturePosition;
float snoise(vec2 p)
{
return texture2D(permTexture, p).r;
}
mat4 rotationMatrix(vec3 axis, float angle)
{
axis = normalize(axis);
float s = sin(angle);
float c = cos(angle);
float oc = 1.0 - c;
return mat4(oc * axis.x * axis.x + c, oc * axis.x * axis.y - axis.z * s, oc * axis.z * axis.x + axis.y * s, 0.0,
oc * axis.x * axis.y + axis.z * s, oc * axis.y * axis.y + c, oc * axis.y * axis.z - axis.x * s, 0.0,
oc * axis.z * axis.x - axis.y * s, oc * axis.y * axis.z + axis.x * s, oc * axis.z * axis.z + c, 0.0,
0.0, 0.0, 0.0, 1.0);
}
mat4 translateMatrix(vec2 whereTo)
{
return mat4(1, 0, 0, whereTo.x,
0, 1, 0, whereTo.y,
0, 0, 1, 0,
0, 0, 0, 1);
}
void main( void )
{
vec4 v = gl_Vertex;
// Of course this is nothing like what it will eventually be; just
// experimenting to get at least something.
v -= vec4(center, 0, 0);
if (time <= 0.5)
v = rotationMatrix(vec3(0, 1, 0), time*M_PI) * v;
else
v = rotationMatrix(vec3(0, 1, 0), -(1-time)*M_PI) * v;
v += vec4(center, 0, 0);
// v.z += 10 * (snoise(vec2(tileXIndex, tileYIndex))-0.5) * (1 - abs(time-0.5)*2);
v.z += ((((tileXIndex << 3) ^ tileYIndex) % 10) - 5) * (1 - abs(time-0.5)*2) + 0*vertexIndexInTile;
gl_Position = gl_ProjectionMatrix * gl_ModelViewMatrix * v;
v_texturePosition = gl_MultiTexCoord0.xy;
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
|
