shaders/cloud.vs

   1 layout (location=0) in vec4 a_co;
   2 layout (location=1) in vec4 a_colour;
   3
   4 #include "motion_vectors_vs.glsl"
   5
   6 uniform mat4x3 uMdl;
   7 uniform mat3 uNormMtx;
   8 uniform mat4 uPv;
   9 uniform mat4 uPvmPrev;
  10 uniform vec4 uAnim;
  11
  12 out vec4 aColour;
  13 out vec3 aWorldCo;
  14 out vec3 aCo;
  15
  16 vec2 rand_hash22( vec2 p )
  17 {
  18    vec3 p3 = fract(vec3(p.xyx) * 213.8976123);
  19    p3 += dot(p3, p3.yzx+19.19);
  20    return fract(vec2((p3.x + p3.y)*p3.z, (p3.x+p3.z)*p3.y));
  21 }
  22
  23 vec3 gridify( vec3 p, float s, float t )
  24 {
  25    vec3 co = p*s;
  26    vec2 r2 = rand_hash22(p.xz);
  27    vec3 grid = (vec3(floor(co.x),co.y,floor(co.z))+vec3(0.5,0.0,0.5)) * (1.0/s);
  28
  29    float t1 = 1.0-t;
  30          t1 = 1.0-t1*t1;
  31    float t2 = t*t;
  32
  33    return mix( p, grid, t1 ) + t2*vec3(0.0,r2.y*r2.y*0.2,0.0);
  34 }
  35
  36 void main()
  37 {
  38    vec3 co = gridify( a_co.xyz, uAnim.x, uAnim.y );
  39
  40    vec3 world_pos0 = uMdl     * vec4( co, 1.0 );
  41    vec4 vproj0     = uPv      * vec4( world_pos0, 1.0 );
  42    vec4 vproj1     = uPvmPrev * vec4( co, 1.0 );
  43
  44    float scaler = smoothstep(0.6,0.58,length(co.xz));
  45
  46    vs_motion_out( vproj0, vproj1 );
  47
  48    gl_Position = vproj0;
  49    gl_PointSize = (9.0*scaler) / (max( gl_Position.z, 2.0 ));
  50    aWorldCo = world_pos0;
  51    aColour = a_colour*scaler*(1.0-uAnim.y*uAnim.y);
  52    aCo = co;
  53 }