twgl实现webgl方块翻转动画效果代码-html代码-BFW代码库

twgl实现webgl方块翻转动画效果代码

代码语言：html

所属分类：动画

代码描述：twgl实现webgl方块翻转动画效果代码

下面为部分代码预览，完整代码请点击下载或在bfwstudio webide中打开

<!DOCTYPE html>
<html lang="en" >

<head>
  <meta charset="UTF-8">
  

<style>
html {
  height: 100%;
}
body {
  background: #333;
  overflow: hidden;
  padding: 0;
  margin: 0;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
}
canvas {
  height: 100%;
  width: 100%;
}
</style>


</head>

<body translate="no">
  <canvas id="canvas"></canvas>
<!-- VertexShader code here -->
<script id="vertexShader" type="x-shader/x-vertex">#version 300 es
precision highp float;
  in vec4 position;
  void main() {
    gl_Position = vec4( position );
  }
</script>

<!-- FragmentShader code here -->
<script id="fragmentShader" type="x-shader/x-fragment">#version 300 es
#if __VERSION__ < 130
#define TEXTURE2D texture2D
#else
#define TEXTURE2D texture
#endif
precision highp float;
out vec4 fragColor;
uniform vec2 u_resolution;
uniform vec4 u_mouse;
uniform float u_time;
uniform sampler2D iChannel0;
uniform sampler2D iChannel1;
  
#define R   u_resolution
#define T   u_time
#define M   u_mouse

#define PI  3.1415926
#define PI2 6.2831853

#define MIN_DIST 1e-3
#define MAX_DIST 40.

#define eoc(t) (t=t-1.)*t*t+1.
#define eic(t) t*t*t


vec3 hit,hp;
mat2 mx,my,nx,ny,mz,mw,nz,nw;

mat2 rot (float a) { return mat2(cos(a),sin(a),-sin(a),cos(a)); }
float hash21( vec2 p ) { return fract(sin(dot(p,vec2(23.43,35.23))) *472.323); }

// timing functions
float lerp (float b, float e, float t) { return clamp((t - b) / (e - b), 0., 1.); }

float box(vec3 p, vec3 b){
    vec3 d = abs(p)-b;
    return length(max(d,0.))+min(max(d.x,max(d.y,d.z)),.0);
}

//globals
vec3 s_hit, g_hit;
vec2 s_id, g_id;
float tspeed=0., tmod=0., t1=0., t3=0., t4=0.;

//scales for all things
const float scale = .75;
const float scale_h = scale/2.;
const vec2 s = vec2(scale*2.2);

const vec2 pos = vec2(.5,-.5);
const vec2[4] ps4 = vec2[4](pos.yx,pos.xx,pos.xy,pos.yy);

float pattern(inout vec3 q, vec2 id) {
    float res = 1e5;
    float rnd = hash21(id);

    float ths =length(5.+5.*sin(id*.3));
    ths = (rnd*1.37)+fract(ths*4324.35);
    
    // turn based on mod time
    ths += rnd;
    float t1 = lerp(ths    ,ths+  .5,tmod);
    float t2 = lerp(ths+5. ,ths+ 5.5,tmod);
    float t3 = lerp(ths+10.,ths+10.5,tmod);
    float t4 = lerp(ths+15.,ths+15.5,tmod);  
    t1 = eoc(t1); t1 = eic(t1);
    t2 = eoc(t2); t2 = eic(t2);
    t3 = eoc(t3); t3 = eic(t3);
    t4 = eoc(t4); t4 = eic(t4);
    
    vec3 nq = q-vec3(0,((t2-t3)+(t1-t4))*scale,0);

    // messy first draft
    float rf = 1.5707;
    
    nx = rot(rf*(t1-t2));
    ny = rot(rf*(t3+t4));
    nq.zy *= nx;
    nq.xz *= ny;
    
    nz = rot(rf*(t1-t4));
    nw = rot(rf*(t2-t3));
    nq.zy *= nz;
    nq.xz *= nw;

    float d = box(nq,vec3(scale_h))-.0185;
    if(d<res) {
        res = d;
        q = nq;
    }
    return res;
}
// block map -v4 tap technique from @Shane
vec2 map(vec3 q3){
    vec2 res = vec2(1e5,0.), p, ip, ct = vec2(0);
    float t=1e5, y=1e5, m=1.;
    for(int i =0; i<4; i++){
    
        ct = ps4[i]/2. -  ps4[0]/2.;
        p = q3.xz - ct*s;
        ip.........完整代码请登录后点击上方下载按钮下载查看