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/* -*- 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/.
*/
#version 140
#define M_PI 3.1415926535897932384626433832795
attribute vec3 a_position;
attribute vec3 a_normal;
uniform mat4 u_projectionMatrix;
uniform mat4 u_modelViewMatrix;
uniform mat4 u_sceneTransformMatrix;
uniform mat4 u_primitiveTransformMatrix;
uniform mat4 u_operationsTransformMatrix;
varying vec2 v_texturePosition;
varying vec3 v_normal;
attribute vec3 center;
uniform float time;
uniform ivec2 numTiles;
uniform sampler2D permTexture;
varying float angle;
float snoise(vec2 p)
{
return texture2D(permTexture, p).r;
}
mat4 translationMatrix(vec3 axis)
{
return mat4(1.0, 0.0, 0.0, 0.0,
0.0, 1.0, 0.0, 0.0,
0.0, 0.0, 1.0, 0.0,
axis.x, axis.y, axis.z, 1.0);
}
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);
}
void main( void )
{
vec2 pos = (center.xy + 1.0) / 2.0;
// 0..1 pseudo-random value used to randomize the tile’s start time.
float fuzz = snoise(pos);
float startTime = pos.x * 0.5 + fuzz * 0.25;
float endTime = startTime + 0.25;
// Scale the transition time to minimize the time a tile will stay black.
float transitionTime = clamp((time - startTime) / (endTime - startTime), 0.0, 1.0);
if (transitionTime < 0.5)
transitionTime = transitionTime * 0.3 / 0.5;
else
transitionTime = (transitionTime * 0.3 / 0.5) + 0.4;
angle = transitionTime * M_PI * 2.0;
mat4 modelViewMatrix = u_modelViewMatrix * u_operationsTransformMatrix * u_sceneTransformMatrix * u_primitiveTransformMatrix;
mat4 transformMatrix = translationMatrix(center) * rotationMatrix(vec3(0.0, 1.0, 0.0), angle) * translationMatrix(-center);
mat3 normalMatrix = mat3(transpose(inverse(transformMatrix)));
gl_Position = u_projectionMatrix * modelViewMatrix * transformMatrix * vec4(a_position, 1.0);
v_texturePosition = vec2((a_position.x + 1.0) / 2.0, (1.0 - a_position.y) / 2.0);
v_normal = normalize(normalMatrix * a_normal);
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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