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#ifdef GL_ES
precision highp float;
#endif
uniform sampler2D u_tex0;
uniform float u_time;
uniform vec2 u_resolution;
const float PI = 3.1415926535897932;
//speed
const float speed = 0.2;
const float speed_x = 0.3;
const float speed_y = 0.3;
// geometry
const float intensity = 3.;
const int steps = 8;
const float frequency = 4.0;
const int angle = 7; // better when a prime
// reflection and emboss
const float delta = 20.;
const float intence = 400.;
const float emboss = 0.3;
//---------- crystals effect
float col(vec2 coord)
{
float delta_theta = 2.0 * PI / float(angle);
float col = 0.0;
float theta = 0.0;
for (int i = 0; i < steps; i++)
{
vec2 adjc = coord;
theta = delta_theta*float(i);
adjc.x += cos(theta)*u_time*speed + u_time * speed_x;
adjc.y -= sin(theta)*u_time*speed - u_time * speed_y;
col = col + cos( (adjc.x*cos(theta) - adjc.y*sin(theta))*frequency)*intensity;
}
return cos(col);
}
//---------- main
void main(void)
{
vec2 p = (gl_FragCoord.xy) / u_resolution.xy, c1 = p, c2 = p;
float cc1 = col(c1);
c2.x += u_resolution.x/delta;
float dx = emboss*(cc1-col(c2))/delta;
c2.x = p.x;
c2.y += u_resolution.y/delta;
float dy = emboss*(cc1-col(c2))/delta;
c1.x += dx;
c1.y = -(c1.y+dy);
float alpha = 1.+dot(dx,dy)*intence;
gl_FragColor = texture2D(u_tex0,c1)*(alpha);
// gl_FragColor = vec4(col(p),0,0,1);
}
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