gpupaper/shaders/cloudninja.frag

#ifdef GL_ES
precision highp float; 
#endif

vec2 uv;

uniform float time;
uniform vec2 resolution;

const vec2 ch_size  = vec2(1.0, 2.0) * 0.6;              // character size (X,Y)
const vec2 ch_space = ch_size + vec2(1.0, 1.0);    // character distance Vector(X,Y)
const vec2 ch_start = vec2 (ch_space.x * -5., 1.); // start position
      vec2 ch_pos   = vec2 (0.0, 0.0);             // character position(X,Y)
//      vec3 ch_color = vec3 (1.5, 0.75, 0.5);        // character color (R,G,B)
//const vec3 bg_color = vec3 (0.2, 0.2, 0.2);        // background color (R,G,B)

#define REPEAT_SIGN false // True/False; True=Multiple, False=Single

/* 16 segment display...Akin to LED Display.

Segment bit positions: 


 binary to hex -> 0x119F
*/

#define n0 ddigit(0x22FF);
#define n1 ddigit(0x0281);
#define n2 ddigit(0x1177);
#define n3 ddigit(0x11E7);
#define n4 ddigit(0x5508);
#define n5 ddigit(0x11EE);
#define n6 ddigit(0x11FE);
#define n7 ddigit(0x2206);
#define n8 ddigit(0x11FF);
#define n9 ddigit(0x11EF);

#define A ddigit(0x119F);
#define B ddigit(0x927E);
#define C ddigit(0x007E);
#define D ddigit(0x44E7);
#define E ddigit(0x107E);
#define F ddigit(0x101E);
#define G ddigit(0x807E);
#define H ddigit(0x1199);
#define I ddigit(0x4466);
#define J ddigit(0x4436);
#define K ddigit(0x9218);
#define L ddigit(0x0078);
#define M ddigit(0x0A99);
#define N ddigit(0x8899);
#define O ddigit(0x00FF);
#define P ddigit(0x111F);
#define Q ddigit(0x80FF);
#define R ddigit(0x911F);
#define S ddigit(0x8866);
#define T ddigit(0x4406);
#define U ddigit(0x00F9);
#define V ddigit(0x2218);
#define W ddigit(0xA099);
#define X ddigit(0xAA00);
#define Y ddigit(0x4A00);
#define Z ddigit(0x2266);
#define _ ch_pos.x += ch_space.x;
#define s_dot     ddigit(0);
#define s_minus   ddigit(0x1100);
#define s_plus    ddigit(0x5500);
#define s_greater ddigit(0x2800);
#define s_less    ddigit(0x8200);
#define s_sqrt    ddigit(0x0C02);
#define nl1 ch_pos = ch_start;  ch_pos.y -= 3.0;
#define nl2 ch_pos = ch_start;  ch_pos.y -= 6.0;
#define nl3 ch_pos = ch_start;	ch_pos.y -= 9.0;

float dseg(vec2 p0, vec2 p1)
{
	vec2 dir = normalize(p1 - p0);
	vec2 cp = (uv - ch_pos - p0) * mat2(dir.x, dir.y,-dir.y, dir.x);
	return distance(cp, clamp(cp, vec2(0), vec2(distance(p0, p1), 0)));   
}

bool bit(int n, int b)
{
	return mod(floor(float(n) / exp2(floor(float(b)))), 2.0) != 0.0;
}

float d = 1e6;

void ddigit(int n)
{
	float v = 1e6;	
	vec2 cp = uv - ch_pos;
	if (n == 0)     v = min(v, dseg(vec2(-0.405, -1.000), vec2(-0.500, -1.000)));
	if (bit(n,  0)) v = min(v, dseg(vec2( 0.500,  0.063), vec2( 0.500,  0.937)));
	if (bit(n,  1)) v = min(v, dseg(vec2( 0.438,  1.000), vec2( 0.063,  1.000000000)));
	if (bit(n,  2)) v = min(v, dseg(vec2(-0.063,  1.000), vec2(-0.438,  1.000)));
	if (bit(n,  3)) v = min(v, dseg(vec2(-0.500,  0.937), vec2(-0.500,  0.062)));
	if (bit(n,  4)) v = min(v, dseg(vec2(-0.500, -0.063), vec2(-0.500, -0.938)));
	if (bit(n,  5)) v = min(v, dseg(vec2(-0.438, -1.000), vec2(-0.063, -1.000)));
	if (bit(n,  6)) v = min(v, dseg(vec2( 0.063, -1.000), vec2( 0.438, -1.000)));
	if (bit(n,  7)) v = min(v, dseg(vec2( 0.500, -0.938), vec2( 0.500, -0.063)));
	if (bit(n,  8)) v = min(v, dseg(vec2( 0.063,  0.000), vec2( 0.438, -0.000)));
	if (bit(n,  9)) v = min(v, dseg(vec2( 0.063,  0.063), vec2( 0.438,  0.938)));
	if (bit(n, 10)) v = min(v, dseg(vec2( 0.000,  0.063), vec2( 0.000,  0.937)));
	if (bit(n, 11)) v = min(v, dseg(vec2(-0.063,  0.063), vec2(-0.438,  0.938)));
	if (bit(n, 12)) v = min(v, dseg(vec2(-0.438,  0.000), vec2(-0.063, -0.000)));
	if (bit(n, 13)) v = min(v, dseg(vec2(-0.063, -0.063), vec2(-0.438, -0.938)));
	if (bit(n, 14)) v = min(v, dseg(vec2( 0.000, -0.938), vec2( 0.000, -0.063)));
	if (bit(n, 15)) v = min(v, dseg(vec2( 0.063, -0.063), vec2( 0.438, -0.938)));
	ch_pos.x += ch_space.x;
	d = min(d, v);
}
mat2 rotate(float a)
{
	float c = cos(a);
	float s = sin(a);
	return mat2(c, s, -s, c);
}
vec3 hsv2rgb_smooth( in vec3 c )
{
    vec3 rgb = clamp( abs(mod(c.x*6.0+vec3(0.0,4.0,2.0),6.0)-3.0)-1.0, 0.0, 1.0 );

	rgb = rgb*rgb*(3.0-2.0*rgb); // cubic smoothing	

	return c.z * mix( vec3(1.0), rgb, c.y);
}
void main( void ) 
{
	
	vec2 aspect = resolution.xy / resolution.y;
	uv = ( gl_FragCoord.xy / resolution.y ) - aspect / 2.0;
	float _d =  1.0-length(uv);
	uv *= 18.0 ;
	uv.y -= 3.;
	//uv *= rotate(time+uv.x*0.05);

	
	
	vec3 ch_color = hsv2rgb_smooth(vec3(time*0.4+uv.y*0.1,0.5,1.0));

	vec3 bg_color = vec3(_d*0.4, _d*0.2, _d*0.1);
	
	

	
	uv.x += -1.+sin(time+uv.y*0.7)*0.5;
	ch_pos = ch_start;

	           _ C L O U D  N I N J A 
			 
		
	vec3 color = mix(ch_color, bg_color, 1.0- (0.08 / d*2.0));  // shading
	gl_FragColor = vec4(color, 1.0);
}