#version 150
//OVE shader_name: Circle Crop
//OVE shader_description: by fkuteken (License: MIT)

//OVE name: Background color
//OVE type: COLOR
//OVE default: RGBA(0.1, 0.1, 0.2,  1)
//OVE description: 
uniform vec4 bgcolor; // = vec4(0.0, 0.0, 0.0, 1.0)

//OVE name: Aspect ratio
//OVE type: FLOAT
//OVE flag: NOT_CONNECTABLE
//OVE min: 0.1
//OVE max: 10.0
//OVE default: 1.0
//OVE description: 
uniform float aspect_ratio;

//OVE name: Smoothness
//OVE type: FLOAT
//OVE flag: NOT_CONNECTABLE
//OVE min: 0.0
//OVE max: 1.0
//OVE default: 0.1
//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;

uniform vec2 resolution_in;

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

in vec2 ove_texcoord;
out vec4 frag_color;

vec2 ratio2 = vec2(1.0, resolution_in.y/ resolution_in.x);


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;
  }
}


vec2 fix_as( vec2 point) {
  return vec2( point.x*aspect_ratio*resolution_in.x/resolution_in.y, point.y);
}

vec4 transition (vec2 uv, float progress) {
  float dist = length((vec2(uv) - 0.5) * ratio2);
  float s = pow(2.0 * abs(progress - 0.5), 3.0);
  return mix(
    progress < 0.5 ? getFromColor(uv) : getToColor(uv),
    bgcolor,
    smoothstep(s-smoothness, s+smoothness , dist)
  );
}


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