shaders/model_sky_space.fs

   1 uniform sampler2D uTexGarbage;
   2
   3 in vec4 aColour;
   4 in vec2 aUv;
   5 in vec3 aNorm;
   6 in vec3 aCo;
   7 in vec3 aWorldCo;
   8
   9 // Spooky!
  10 const vec3 uCamera = vec3(0.0);
  11
  12 #include "common_world.glsl"
  13 #include "motion_vectors_fs.glsl"
  14
  15 float stars1( vec3 rd, float rr, float size ){
  16    vec3 co = rd * rr;
  17
  18    float a = atan(co.y, length(co.xz)) + 4.0 * PI;
  19
  20    float spaces = 1.0 / rr;
  21    size = (rr * 0.0015) * fwidth(a) * 1000.0 * size;
  22    a -= mod(a, spaces) - spaces * 0.5;
  23
  24    float count = floor(sqrt(pow(rr, 2.0) * (1.0 - pow(sin(a), 2.0))) * 3.0);
  25
  26    float plane = atan(co.z, co.x) + 4.0 * PI;
  27    plane = plane - mod(plane, PI / count);
  28
  29    vec2 delta = rand33(vec3(plane, a, 0.0)).xy;
  30
  31    float level = sin(a + spaces * (delta.y - 0.5) * (1.0 - size)) * rr;
  32    float ydist = sqrt(rr * rr - level * level);
  33    float angle = plane + (PI * (delta.x * (1.0-size) + size * 0.5) / count);
  34    vec3 center = vec3(cos(angle) * ydist, level, sin(angle) * ydist);
  35    float star = smoothstep(size, 0.0, distance(center, co));
  36    return star;
  37 }
  38
  39 void main(){
  40    compute_motion_vectors();
  41
  42    vec3 rd = -normalize(aNorm);
  43
  44    float star = 0.0;
  45    for( float j = 1.0; j <= 4.1; j += 1.0 ){
  46       float m = mix(0.6, 0.9, smoothstep(1.0, 2.0, j));
  47       star += stars( rd, 1.94 * pow( 1.64, j ), m ) * (1.0 / pow(4.0, j));
  48    }
  49
  50    oColour = vec4( vec3(star*20.0), 1.0);
  51 }