#version 430 core

///////////////////////////////////////////////////////////////////////////////
// shader inputs/outputs
///////////////////////////////////////////////////////////////////////////////
uniform float iGlobalTime; // in seconds
uniform vec2 iResolution; // viewport resolution (in pixels) (1080p or 720p)
uniform mat4 iMidiPad; // 16 buttons of midi controller
uniform float iMidiPadValue; // sum of all elements in iMidiPad/16

// all samplers have linear filtering applied, wraping set to repeat
//
uniform sampler1D iFFTTexture; // 1024
uniform float iFFT[8]; // latest frame
uniform float iFFTs[8]; // smoothed latest frame
uniform sampler2D iFFTsHistory; // smoothed fft history, 8x1024, x coord = bin, y coord n-frames earlier, y=0 is latest frame

// predefined textures
//
uniform sampler2D iTex1;
uniform sampler2D iTex2;
uniform sampler2D iTex3;
uniform sampler2D iTex4;
uniform sampler2D iNoise;
uniform sampler2D iChecker;

// out_color must be written in order to see anything
//
layout(location = 0) out vec4 out_color;
///////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////


float hash(float n)

{

	return fract ( sin(n) * 45612.2134);

}





float h(vec3 p)

{

	p.z += 5 * iGlobalTime;

	p.y += sin(p.z + iFFTs[3]) ;

	p = mod(p-5, 10) - 5;

 	return -length(p.xy) + 3 - iFFTs[0] * 3 ;

}


void main(void)
{

	float aspect = iResolution.x/iResolution.y;

	vec3 rd = normalize(vec3 (aspect*(gl_FragCoord.x / iResolution.x - .5), gl_FragCoord.y/iResolution.y - .5,1 + (20*iFFTs[1] - iFFTs[5]))), p=vec3(0);

	float d;

	for(int i = 0; i< 256; i++)

	{

		d = h(p);

		if(d<.001)

			break;

		p += rd* d / 8;

	}
	vec2 uv = vec2( gl_FragCoord.xy ) / iResolution;
	float f = texture( iFFTTexture, uv.x  ).r * 100;
	out_color = vec4(.7,.2,.4,1) * vec4(h(p - vec3(.01) ) * 10) ;
}