スライドショー３
attribute vec3 position;
attribute vec2 texcoord;
uniform mat4 modelViewMatrix;
uniform mat4 modelViewMatrixInverse;
uniform mat4 modelViewProjectionMatrix;
varying vec2 fragTexCoord;
void main()
{
fragTexCoord = vec2(texcoord.x, 1.0 - texcoord.y);
gl_Position = modelViewProjectionMatrix * vec4(position, 1.0);
}
#ifdef GL_FRAGMENT_PRECISION_HIGH
precision highp float;
#else
precision mediump float;
#endif
uniform sampler2D tex;
uniform float time;
uniform float calcSw;
varying vec2 fragTexCoord;
const int oct = 8;
const float per = 0.5;
const float PI = 3.1415926;
const float SQ = 1.4142136;
const float EX = 2.7182818;
const float SQ10 = 3.1622777;
const float eps = 0.000001;
// 補間関数
float interpolate(float a, float b, float x){
float f = (1.0 - cos(x * PI)) * 0.5;
return a * (1.0 - f) + b * f;
}
// 乱数生成
float rnd(vec2 p){
return fract(sin(dot(p ,vec2(12.9898,78.233))) * 43758.5453);
}
// 補間乱数
float irnd(vec2 p){
vec2 i = floor(p);
vec2 f = fract(p);
vec4 v = vec4(rnd(vec2(i.x, i.y )),
rnd(vec2(i.x + 1.0, i.y )),
rnd(vec2(i.x, i.y + 1.0)),
rnd(vec2(i.x + 1.0, i.y + 1.0)));
return interpolate(interpolate(v.x, v.y, f.x), interpolate(v.z, v.w, f.x), f.y);
}
// ノイズ生成
float noise(vec2 p){
float t = 0.0;
for(int i = 0; i < oct; i++){
float freq = pow(2.0, float(i));
float amp = pow(per, float(oct - i));
t += irnd(vec2(p.x / freq, p.y / freq)) * amp;
}
return t;
}
// シームレスノイズ生成
float snoise(vec2 p, vec2 q, vec2 r){
return noise(vec2(p.x, p.y )) * q.x * q.y +
noise(vec2(p.x, p.y + r.y)) * q.x * (1.0 - q.y) +
noise(vec2(p.x + r.x, p.y )) * (1.0 - q.x) * q.y +
noise(vec2(p.x + r.x, p.y + r.y)) * (1.0 - q.x) * (1.0 - q.y);
}
//星
void star(void){
vec2 q = vec2(fragTexCoord.x, 1.0 - fragTexCoord.y);
vec2 p = (q - 0.5) * 2.0;
float l = length(p);
float th = atan(p.y, p.x);
float f0 = cos((acos(sin(5.0 * th)) - 2.0 * PI) / 5.0);
if(abs(f0) < eps) { discard; }
float t = mod(time, 4.0) / 4.0;
float r = 1.0 / f0 / SQ10 * t * 3.0;
r = mix(r, SQ, t);
float inner = 0.0;
if(l <= r) { inner = 1.0; }
vec4 texCol = texture2D(tex, fragTexCoord);
texCol.a = inner;
gl_FragColor = texCol;
}
//円
void circle(void){
vec4 texCol = texture2D(tex, fragTexCoord);
float t = 1.0 - length((fragTexCoord - 0.5) * 2.0) / SQ;
//float t = length((fragTexCoord - 0.5) * 2.0) / SQ;
float spn = 32.0;
float rt = 4.0;
float pw = 32.0;
float m = pow(min(t * mod(time * rt, spn), 1.0), pw);
//float m = min(t * mod(time * rt, spn), 1.0);
texCol.a = texCol.a * m;
gl_FragColor = texCol;
}
//ランダムモザイク
void mosaic(void){
vec4 texCol = texture2D(tex, fragTexCoord);
// noise
//vec2 t = floor(gl_FragCoord.xy / 16.0);
vec2 t = floor(gl_FragCoord.xy / 16.0) + vec2(time * 10.0, time * 3.0);
//vec2 t = gl_FragCoord.xy + vec2(time * 10.0);
//float n = noise(t);
float n = rnd(t);
// seamless noise
//const float map = 256.0;
//vec2 t = mod(gl_FragCoord.xy + vec2(time * 10.0), map);
//float n = snoise(t, t / map, vec2(map));
//texCol.a = texCol.a * n;
float spn = 32.0;
float rt = 4.0;
float pw = 32.0;
//float m = min(floor(n * mod(time * rt, spn)), 1.0);
float m = pow(min(n * mod(time * rt, spn), 1.0), pw);
//float m = floor(n * 2.0);
texCol.a = texCol.a * m;
gl_FragColor = texCol;
//gl_FragColor = vec4(vec3(n), 1.0);
}
void main(void) {
//mosaic();
//circle();
//star();
if(0.0 <= calcSw && calcSw < 1.0) { mosaic(); }
else if(calcSw < 2.0) { circle(); }
else if(calcSw < 3.0) { star(); }
else { mosaic(); }
}
mosaic circle star
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