// Compatibility #ifdefs needed for parameters
#ifdef GL_ES
#define COMPAT_PRECISION mediump
#else
#define COMPAT_PRECISION
#endif

// Parameter lines go here:
#pragma parameter RETRO_PIXEL_SIZE "Retro Pixel Size" 0.84 0.0 1.0 0.01
#ifdef PARAMETER_UNIFORM
// All parameter floats need to have COMPAT_PRECISION in front of them
uniform COMPAT_PRECISION float RETRO_PIXEL_SIZE;
#else
#define RETRO_PIXEL_SIZE 0.84
#endif

#if defined(VERTEX)

#if __VERSION__ >= 130
#define COMPAT_VARYING out
#define COMPAT_ATTRIBUTE in
#define COMPAT_TEXTURE texture
#else
#define COMPAT_VARYING varying 
#define COMPAT_ATTRIBUTE attribute 
#define COMPAT_TEXTURE texture2D
#endif

#ifdef GL_ES
#define COMPAT_PRECISION mediump
#else
#define COMPAT_PRECISION
#endif

COMPAT_ATTRIBUTE vec4 VertexCoord;
COMPAT_ATTRIBUTE vec4 COLOR;
COMPAT_ATTRIBUTE vec4 TexCoord;
COMPAT_VARYING vec4 COL0;
COMPAT_VARYING vec4 TEX0;
// out variables go here as COMPAT_VARYING whatever

vec4 _oPosition1; 
uniform mat4 MVPMatrix;
uniform COMPAT_PRECISION int FrameDirection;
uniform COMPAT_PRECISION int FrameCount;
uniform COMPAT_PRECISION vec2 OutputSize;
uniform COMPAT_PRECISION vec2 TextureSize;
uniform COMPAT_PRECISION vec2 InputSize;

// compatibility #defines
#define vTexCoord TEX0.xy
#define SourceSize vec4(TextureSize, 1.0 / TextureSize) //either TextureSize or InputSize
#define OutSize vec4(OutputSize, 1.0 / OutputSize)

void main()
{
    gl_Position = MVPMatrix * VertexCoord;
    TEX0.xy = VertexCoord.xy;
// Paste vertex contents here:
}

#elif defined(FRAGMENT)

#if __VERSION__ >= 130
#define COMPAT_VARYING in
#define COMPAT_TEXTURE texture
out vec4 FragColor;
#else
#define COMPAT_VARYING varying
#define FragColor gl_FragColor
#define COMPAT_TEXTURE texture2D
#endif

#ifdef GL_ES
#ifdef GL_FRAGMENT_PRECISION_HIGH
precision highp float;
#else
precision mediump float;
#endif
#define COMPAT_PRECISION mediump
#else
#define COMPAT_PRECISION
#endif

uniform COMPAT_PRECISION int FrameDirection;
uniform COMPAT_PRECISION int FrameCount;
uniform COMPAT_PRECISION vec2 OutputSize;
uniform COMPAT_PRECISION vec2 TextureSize;
uniform COMPAT_PRECISION vec2 InputSize;
uniform sampler2D Texture;
COMPAT_VARYING vec4 TEX0;
// in variables go here as COMPAT_VARYING whatever

// compatibility #defines
#define Source Texture
#define vTexCoord TEX0.xy

#define SourceSize vec4(TextureSize, 1.0 / TextureSize) //either TextureSize or InputSize
#define OutSize vec4(OutputSize, 1.0 / OutputSize)

// delete all 'params.' or 'registers.' or whatever in the fragment
float iGlobalTime = float(FrameCount)*0.025;
vec2 iResolution = OutputSize.xy;

// Created by inigo quilez - iq/2013
// License Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.

// Tutorial here: 
//
// * https://www.youtube.com/watch?v=-z8zLVFCJv4
//
// * http://iquilezles.org/live/index.htm


void mainImage( out vec4 fragColor, in vec2 fragCoord )
{
	vec2 q = 0.6 * (2.0*fragCoord-iResolution.xy)/min(iResolution.y,iResolution.x);

    float a = atan( q.x, q.y );
    float r = length( q );
    float s = 0.50001 + 0.5*sin( 3.0*a + iGlobalTime );
    float g = sin( 1.57+3.0*a+iGlobalTime );
    float d = 0.15 + 0.3*sqrt(s) + 0.15*g*g;
    float h = clamp( r/d, 0.0, 1.0 );
    float f = 1.0-smoothstep( 0.95, 1.0, h );
    
    h *= 1.0-0.5*(1.0-h)*smoothstep( 0.95+0.05*h, 1.0, sin(3.0*a+iGlobalTime) );
	
	vec3 bcol = vec3(0.9+0.1*q.y, 1.0, 0.9-0.1*q.y);
	bcol *= 1.0 - 0.5*r;
    vec3 col = mix( bcol, 1.2*vec3(0.65*h, 0.25+0.5*h, 0.0), f );

    fragColor = vec4( col, 1.0 );
}

 void main(void)
{
  //just some shit to wrap shadertoy's stuff
  vec2 FragCoord = vTexCoord.xy*OutputSize.xy;
  mainImage(FragColor,FragCoord);
}
#endif