#version 150
//OVE shader_name: Random Squares
//OVE shader_description: by gre (Licence MIT)

//OVE name: Number
//OVE type: FLOAT
//OVE flag: NOT_CONNECTABLE
//OVE min: 0.1
//OVE max: 200.0
//OVE default: 10.0
//OVE description: 
uniform float size;

//OVE name: Smoothness
//OVE type: FLOAT
//OVE flag: NOT_CONNECTABLE
//OVE min: 0
//OVE max: 10
//OVE default: 0.5
//OVE description: 
uniform float smoothness;

//OVE end

#define LINEAR_CURVE 0
#define EXPONENTIAL_CURVE 1
#define LOGARITHMIC_CURVE 2

uniform sampler2D out_block_in;
uniform sampler2D in_block_in;
uniform bool out_block_in_enabled;
uniform bool in_block_in_enabled;
uniform int curve_in;

/* animated from 0 to 1 */
uniform float ove_tprog_all;

in vec2 ove_texcoord;
out vec4 frag_color;

float progress;

vec4 getFromColor( vec2 p)
{
   return texture( in_block_in, p);
}

vec4 getToColor( vec2 p)
{
   return texture( out_block_in, p);
}

float TransformCurve(float linear) {
    if (curve_in == EXPONENTIAL_CURVE) {
        return linear * linear;
    } else if (curve_in == LOGARITHMIC_CURVE) {
        return sqrt(linear);
    } else {
        return linear;
    }
}

 
float rand (vec2 co) {
  return fract(sin(dot(co.xy ,vec2(12.9898,78.233))) * 43758.5453);
}

vec4 transition(vec2 p) {
  float r = rand(floor(vec2(size) * p));
  float m = smoothstep(0.0, -smoothness, r - (progress * (1.0 + smoothness)));
  return mix(getFromColor(p), getToColor(p), m);
}



void main(void) {
    progress =  TransformCurve(1.0 - ove_tprog_all);
    frag_color = transition( ove_texcoord.xy);
}