Create planet_and_spaceship.frag

planet_and_spaceship.frag

@@ -0,0 +1,116 @@
+vec4 read(vec2 p) {
+    return texture2D(backbuffer, p);
+}
+
+
+const mat3 gauss = mat3(1.0, 2.0, 1.0, 
+                        2.0,-12.0, 2.0, 
+                        1.0, 2.0, 1.0) / 8.0;   
+
+
+const mat3 idm = mat3(1., 0., 0.,
+                      0., 1., 0., 
+                      0., 0., 1.);
+
+
+mat2 rot(float a) {
+    return mat2(cos(a), -sin(a), 
+                sin(a),  cos(a));
+}
+
+
+vec3 conv (ivec2 xy, mat3 filter, mat3 m) {
+
+    vec3 l = vec3(0.0);
+
+    filter *= m;
+
+    for (int y=0; y<3; ++y)
+        for (int x=0; x<3; ++x) {
+            ivec2 p = xy + ivec2(x-1, y-1);
+            vec4 v = read(vec2(p) / (resolution.xy - vec2(.5) ));
+            l += filter[x][y] * v.xyz;
+        }
+
+    return l;  
+}  
+
+
+float circle(vec2 p, float r) {
+    return length(p) - pow(r, 2.);
+}
+
+
+void main () {
+
+  float paint = 1.;
+
+
+  vec2 data = ((mouse.xy / resolution.xy) - vec2(1.)) * vec2(2., 1.);
+//   data = vec2(0.);
+  vec3 color = vec3(0.);
+
+  vec4 val = read(uvN());
+  float a = val.x;
+  float b = val.z;
+
+  float ship = val.w;
+
+
+  vec2 uvr = uv() * rot(time/ .3) / 2. ;
+
+
+
+  float rate_a = .9 - pow((uvr.y), 2.) ;
+  float rate_b = .5 - pow((uvr.x), 2.) ;
+  float feed = .8 * - circle(uv(), (.75 + sin(time ) / 8.));// + data.y / 10.;
+  float kill =  .4 * circle(uv(), (.5 + sin(time / 5.) / 12.)); // + data.x / 10.; 
+  float speed = 1.;
+
+
+  // spaceship
+  vec2 uvm = uv() * rot(time / 2.) + vec2(.2 + sin(time / 1.62) / 3., + sin(time / 1.62 * .3));
+//   vec2 uvf = (uv() * rot(time ) + vec2(1. + sin(time / 1.62) / 3., 0.1 + sin(time / 1.62) / 3.));
+
+
+  float sr = .2;
+  ship += - circle(uvm, sr) ;
+  color.z += circle(uvm, sr + .08) < 0. ?  ship * 10. : 0.;
+
+  color.x += sin(circle(uvm , sr) * (400. + sin(time) * 130.)) < 0. ? color.z * 4.: 0.;
+
+  rate_b += circle(uvm, sr) < 0. ? 49. : 0.; 
+  rate_a -= circle(uvm, sr) < 0. ? 38. : 0.; 
+
+  kill = circle(uvm, .3 ) < 0. ? 0. : kill;
+
+
+
+
+
+  mat3 m = mat3(val.x, 0.,             0.,
+                0.,    -val.x + val.z, 0.,
+                0.,    0.,             val.x);
+
+  ivec2 coord = ivec2(gl_FragCoord.xy);
+  float da =   rate_a * conv(coord, gauss, m ).x  - a*b*b + conv(coord, gauss, idm).x * feed * (1.-a);
+  float db =  rate_b * conv(coord, gauss, m).z + a*b*b - kill * b;
+
+  color += val.xyz + vec3(da, 0, db) * speed;
+
+  vec2 uvp = vec2(uv().x - data.x, -uv().y - (data.y) )  - vec2(.1);
+
+  // planet core
+  uvp = uv();
+  vec3 core = vec3(0.);
+  core += paint * ( circle(uvp, .2 + sin(time * .6) / 4.) < 0. ? (sin(circle(uvp, .3 + sin(time * 6.) / 10.) * (10. + 5. * sin(time * 9.))) < 0. ?  vec3(sin(time), 0., 0.) : vec3(0.)) : vec3(0.));
+  core += paint * (circle(uvp, .2 + sin(time * .16) / 6.) < 0. ? (sin(circle(uvp, .3 + sin(time * 16.) / 60.) * (300. + 100. * sin(time * 30.))) < 0. ?  vec3(0., 0., sin(time*5.)) : vec3(0.)) : vec3(0.));
+  color += core * circle(uvp, .4);
+
+
+//   color.y = - circle(uv(), (.7 + sin(time / .5) / 15.)) * 10.;
+//   color = smoothstep(0., .5, color);
+;
+  gl_FragColor = vec4(color, ship) ;
+
+}