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#version 120
uniform float u_SpikeMult;
uniform float u_Scale;
uniform float u_ScaleSnapshot;
uniform vec3 u_ColorCore;
uniform vec3 u_ColorSpike;
uniform float u_Time;
uniform float u_TimeSnapshot;
varying vec3 v_Color;
/*
float wave ( vec3 input){
return (cos(input.x + u_Time*1.2)*cos(input.y + u_Time*1.3)*cos(input.z + u_Time*1.4));
}
*/
const float PI = 3.14159265358979323846;
float lazyHash(vec3 input){
vec3 v = fract(input*1.23456 + 3.1456);
v*=7;
return fract(v.y + v.x*(v.z+1));
}
float wave ( vec3 input){
float val = lazyHash(input);
float pulse = cos(val*2*PI + u_Time)*cos(u_Time*(1+val)); // Slow save
return pulse;
}
float trim (float val){
return clamp(val - .1,0,1)/.9;
}
float amp(float x){
float b = smoothstep(0.,1.,x);
float c = pow(b,.3);
return c;
}
float triangle(float x){
return 1.0 - abs(2.0 * (x - 0.5));
}
void main() {
//grab local position
vec3 pos = gl_Vertex.xyz;
//Grabs how far the vertex is for center
//Antimatter.model has spikes that are 2 unit away, and the 'core' is 1 unit away
float len = length(pos);
//Grabs distance that remains as spike
float spike = len-1;
//Spike
float extension = wave(pos);
extension = abs(extension);
float spikeSize = extension * u_SpikeMult;
//Scale
float timelerp = clamp(1,0,(u_Time-u_TimeSnapshot)/2.5);
float scale = mix(u_ScaleSnapshot,u_Scale,timelerp)*(1 + 0.5*spike*(spikeSize - 1));
vec3 currentCoreColor = mix(u_ColorCore,u_ColorSpike,triangle(mod((u_Time/4.0 + lazyHash(pos)/2),1.0)));
vec3 currentSpikeColor = mix(u_ColorCore,u_ColorSpike,triangle(mod((u_Time/2.0 + lazyHash(pos)),1.0)));
//v_Color = mix(u_ColorCore,u_ColorSpike,extension*spike);
v_Color = mix(currentCoreColor,currentSpikeColor,extension*spike);
mat4 mScale = mat4(
scale,0,0,0,
0,scale,0,0,
0,0,scale,0,
0,0,0,1);
gl_Position = gl_ModelViewProjectionMatrix * mScale * gl_Vertex;
}
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