//
// Simple passthrough vertex shader
//
attribute vec3 in_Position;                  // (x,y,z)
//attribute vec3 in_Normal;                  // (x,y,z)     unused in this shader.
attribute vec4 in_Colour;                    // (r,g,b,a)
attribute vec2 in_TextureCoord;              // (u,v)

varying vec2 v_vTexcoord;
varying vec4 v_vColour;

void main()
{
    vec4 object_space_pos = vec4( in_Position.x, in_Position.y, in_Position.z, 1.0);
    gl_Position = gm_Matrices[MATRIX_WORLD_VIEW_PROJECTION] * object_space_pos;
    
    v_vColour = in_Colour;
    v_vTexcoord = in_TextureCoord;
}

//######################_==_YOYO_SHADER_MARKER_==_######################@~
#define TAU 6.28318530718

varying vec2 v_vTexcoord;
varying vec4 v_vColour;

uniform vec2  dimension;
uniform float density;
uniform float seed;
uniform vec2  scale;
uniform vec2  alpha;
uniform int   mode;
uniform int   render;

uniform float thickness;

float random  (in vec2 st) { return fract(sin(dot(st.xy + vec2(1., 6.), vec2(2., 7.))) * (1. + seed / 100.)); }

void main() {
	vec2 ntx = v_vTexcoord * vec2(1., dimension.y / dimension.x);
	vec2 tx  = 1. / dimension;
	vec2 ps  = ntx;
	float w  = 0.;
	
	vec2 dim = dimension;
	vec2 pos = ps;
	
	float _t  = min(tx.x, tx.y) / 2.;
	float rp  = dim.x;
	int   amo = int(density * rp);
	
    for (int i = 0; i < amo; i++) {
		float _x = random(vec2(float(i), 1.));
		float _y = random(vec2(1., float(i)));
		
		float _s = mix(scale.x, scale.y, random(vec2(2., float(i))));
    	float _a = mix(alpha.x, alpha.y, random(vec2(float(i), 2.)));
		
		float dst = 1. - distance(pos, vec2(_x, _y));
		float st;
		
		     if(mode == 0) st = smoothstep(1. - max(_t, thickness), 1., 1. - abs(dst - (1. - _s))) * _a;
		else if(mode == 1) st = smoothstep(1. - _s - thickness, 1. - _s + thickness, max(0., dst)) * _a;
		
		     if(render == 0) w  = max(w, st);
		else if(render == 1) w += st;
    }
    
    gl_FragColor = vec4(vec3(w), 1.);
}