mirror of
https://github.com/Ttanasart-pt/Pixel-Composer.git
synced 2024-12-27 07:26:33 +01:00
160 lines
4.7 KiB
GLSL
160 lines
4.7 KiB
GLSL
// 2D Signed Distance equations by InigoQuilez
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varying vec2 v_vTexcoord;
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varying vec4 v_vColour;
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uniform int shape;
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uniform int bg;
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uniform int aa;
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uniform int sides;
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uniform int drawDF;
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uniform int tile;
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uniform float angle;
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uniform float inner;
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uniform float outer;
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uniform float corner;
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uniform float stRad;
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uniform float edRad;
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uniform vec2 angle_range;
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uniform vec2 dimension;
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uniform vec2 center;
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uniform vec2 scale;
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uniform vec4 bgColor;
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#define PI 3.14159265359
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#define TAU 6.283185307179586
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float sdRegularPolygon(in vec2 p, in float r, in int n, in float ang ) { #region
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// these 4 lines can be precomputed for a given shape
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float an = PI / float(n);
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vec2 acs = vec2(cos(an), sin(an));
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// reduce to first sector
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float bn = mod(atan(p.x, p.y) + PI - ang, 2.0 * an) - an;
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p = length(p) * vec2(cos(bn), abs(sin(bn)));
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// line sdf
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p -= r * acs;
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p.y += clamp( -p.y, 0.0, r * acs.y);
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return length(p) * sign(p.x);
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} #endregion
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// signed distance to a n-star polygon with external angle en
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float sdStar(in vec2 p, in float r, in int n, in float m, in float ang) { #region m=[2,n]
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// these 4 lines can be precomputed for a given shape
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float an = PI / float(n);
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float en = PI / m;
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vec2 acs = vec2(cos(an), sin(an));
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vec2 ecs = vec2(cos(en), sin(en)); // ecs=vec2(0,1) and simplify, for regular polygon,
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// reduce to first sector
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float bn = mod( atan(p.x, p.y) + PI - ang, 2.0 * an) - an;
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p = length(p) * vec2(cos(bn), abs(sin(bn)));
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// line sdf
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p -= r * acs;
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p += ecs * clamp( -dot(p, ecs), 0.0, r * acs.y / ecs.y);
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return length(p)*sign(p.x);
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} #endregion
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// sca is the sin/cos of the orientation
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// scb is the sin/cos of the aperture
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float sdArc( in vec2 p, in vec2 sca, in vec2 scb, in float ra, in float rb ) { #region
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p *= mat2(sca.x, sca.y, -sca.y, sca.x);
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p.x = abs(p.x);
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float k = (scb.y * p.x > scb.x * p.y) ? dot(p.xy,scb) : length(p);
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return sqrt( dot(p, p) + ra * ra - 2.0 * ra * k ) - rb;
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} #endregion
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float sdRoundBox( in vec2 p, in vec2 b, in vec4 r ) { #region
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r.xy = (p.x > 0.0)? r.xy : r.zw;
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r.x = (p.y > 0.0)? r.x : r.y;
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vec2 q = abs(p) - b + r.x;
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return min(max(q.x, q.y), 0.0) + length(max(q, 0.0)) - r.x;
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} #endregion
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float sdBox( in vec2 p, in vec2 b ) { #region
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vec2 d = abs(p) - b;
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return length(max(d, 0.0)) + min(max(d.x, d.y), 0.0);
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} #endregion
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float sdTearDrop( vec2 p, float r1, float r2, float h ) { #region
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p.x = abs(p.x);
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float b = (r1-r2)/h;
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float a = sqrt(1.0-b*b);
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float k = dot(p,vec2(-b,a));
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if( k < 0.0 ) return length(p) - r1;
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if( k > a*h ) return length(p-vec2(0.0,h)) - r2;
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return dot(p, vec2(a,b) ) - r1;
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} #endregion
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float sdCross( in vec2 p, in vec2 b, float r ) { #region
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p = abs(p); p = (p.y>p.x) ? p.yx : p.xy;
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vec2 q = p - b;
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float k = max(q.y,q.x);
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vec2 w = (k>0.0) ? q : vec2(b.y-p.x,-k);
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return sign(k)*length(max(w,0.0)) + r;
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} #endregion
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float sdVesica(vec2 p, float r, float d) { #region
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p = abs(p);
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float b = sqrt(r*r-d*d); // can delay this sqrt by rewriting the comparison
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return ((p.y-b)*d > p.x*b) ? length(p-vec2(0.0,b))*sign(d)
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: length(p-vec2(-d,0.0))-r;
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} #endregion
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float sdCrescent(vec2 p, float s, float c, float a) { #region
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float o = length(p) - 1.;
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float i = length(p - vec2(cos(a) * (1. - s * c), sin(a) * (1. - s * c))) / s - 1.;
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return max(o, -i);
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} #endregion
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float sdDonut(vec2 p, float s) { #region
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float o = length(p) - 1.;
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float i = length(p) / s - 1.;
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return max(o, -i);
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} #endregion
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void main() {
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float color = 0.;
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vec2 coord = (v_vTexcoord - center) / scale;
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vec2 ratio = dimension / dimension.y;
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float d;
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if(tile == 1) coord = mod(coord + 1., 2.) - 1.;
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if(shape == 0) {
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d = sdBox( (v_vTexcoord - center) * ratio, (scale * ratio - corner));
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d -= corner;
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} else if(shape == 1) {
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d = length(coord) - 1.;
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} else if(shape == 2) {
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d = sdRegularPolygon( coord, 0.9 - corner, sides, angle );
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d -= corner;
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} else if(shape == 3) {
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d = sdStar( coord, 0.9 - corner, sides, 2. + inner * (float(sides) - 2.), angle );
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d -= corner;
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} else if(shape == 4) d = sdArc( coord, vec2(sin(angle), cos(angle)), angle_range, 0.9 - inner, inner );
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else if(shape == 5) d = sdTearDrop( coord + vec2(0., 0.5), stRad, edRad, 1. );
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else if(shape == 6) d = sdCross( coord, vec2(1. + corner, outer), corner );
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else if(shape == 7) d = sdVesica( coord, inner, outer );
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else if(shape == 8) d = sdCrescent( coord, inner, outer, angle );
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else if(shape == 9) d = sdDonut( coord, inner );
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if(drawDF == 1)
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color = -d;
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else if(aa == 0)
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color = step(d, 0.0);
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else
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color = smoothstep(0.02, -0.02, d);
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gl_FragColor = mix(bgColor, v_vColour, color);
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}
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