shaders/point_map.h

   1 #ifndef SHADER_point_map_H
   2 #define SHADER_point_map_H
   3 static void shader_point_map_link(void);
   4 static void shader_point_map_register(void);
   5 static struct vg_shader _shader_point_map = {
   6    .name = "point_map",
   7    .link = shader_point_map_link,
   8    .vs =
   9 {
  10 .orig_file = "shaders/cloud.vs",
  11 .static_src =
  12 "layout (location=0) in vec4 a_co;\n"
  13 "layout (location=1) in vec4 a_colour;\n"
  14 "\n"
  15 "#line       1        1 \n"
  16 "const float k_motion_lerp_amount = 0.01;\n"
  17 "\n"
  18 "#line      2        0 \n"
  19 "\n"
  20 "out vec3 aMotionVec0;\n"
  21 "out vec3 aMotionVec1;\n"
  22 "\n"
  23 "void vs_motion_out( vec4 vproj0, vec4 vproj1 )\n"
  24 "{\n"
  25 "   // This magically solves some artifacting errors!\n"
  26 "   //\n"
  27 "   vproj1 = vproj0*(1.0-k_motion_lerp_amount) + vproj1*k_motion_lerp_amount;\n"
  28 "\n"
  29 "   aMotionVec0 = vec3( vproj0.xy, vproj0.w );\n"
  30 "   aMotionVec1 = vec3( vproj1.xy, vproj1.w );\n"
  31 "}\n"
  32 "\n"
  33 "#line      5        0 \n"
  34 "\n"
  35 "uniform mat4x3 uMdl;\n"
  36 "uniform mat3 uNormMtx;\n"
  37 "uniform mat4 uPv;\n"
  38 "uniform mat4 uPvmPrev;\n"
  39 "uniform vec4 uAnim;\n"
  40 "\n"
  41 "out vec4 aColour;\n"
  42 "out vec3 aWorldCo;\n"
  43 "out vec3 aCo;\n"
  44 "\n"
  45 "vec2 rand_hash22( vec2 p )\n"
  46 "{\n"
  47 "   vec3 p3 = fract(vec3(p.xyx) * 213.8976123);\n"
  48 "   p3 += dot(p3, p3.yzx+19.19);\n"
  49 "   return fract(vec2((p3.x + p3.y)*p3.z, (p3.x+p3.z)*p3.y));\n"
  50 "}\n"
  51 "\n"
  52 "vec3 gridify( vec3 p, float s, float t )\n"
  53 "{\n"
  54 "   vec3 co = p*s;\n"
  55 "   vec2 r2 = rand_hash22(p.xz);\n"
  56 "   vec3 grid = (vec3(floor(co.x),co.y,floor(co.z))+vec3(0.5,0.0,0.5)) * (1.0/s);\n"
  57 "\n"
  58 "   float t1 = 1.0-t;\n"
  59 "         t1 = 1.0-t1*t1;\n"
  60 "   float t2 = t*t;\n"
  61 "\n"
  62 "   return mix( p, grid, t1 ) + t2*vec3(0.0,r2.y*r2.y*0.2,0.0);\n"
  63 "}\n"
  64 "\n"
  65 "void main()\n"
  66 "{\n"
  67 "   vec3 co = gridify( a_co.xyz, uAnim.x, uAnim.y );\n"
  68 "\n"
  69 "   vec3 world_pos0 = uMdl     * vec4( co, 1.0 );\n"
  70 "   vec4 vproj0     = uPv      * vec4( world_pos0, 1.0 );\n"
  71 "   vec4 vproj1     = uPvmPrev * vec4( co, 1.0 );\n"
  72 "\n"
  73 "   float scaler = smoothstep(0.6,0.58,length(co.xz));\n"
  74 "\n"
  75 "   vs_motion_out( vproj0, vproj1 );\n"
  76 "\n"
  77 "   gl_Position = vproj0;\n"
  78 "   gl_PointSize = (9.0*scaler) / (max( gl_Position.z, 2.0 ));\n"
  79 "   aWorldCo = world_pos0;\n"
  80 "   aColour = a_colour*scaler*(1.0-uAnim.y*uAnim.y);\n"
  81 "   aCo = co;\n"
  82 "}\n"
  83 ""},
  84    .fs =
  85 {
  86 .orig_file = "shaders/cloud.fs",
  87 .static_src =
  88 "out vec4 FragColor;\n"
  89 "\n"
  90 "#line       1        1 \n"
  91 "const float k_motion_lerp_amount = 0.01;\n"
  92 "\n"
  93 "#line      2        0 \n"
  94 "\n"
  95 "layout (location = 1) out vec2 oMotionVec;\n"
  96 "\n"
  97 "in vec3 aMotionVec0;\n"
  98 "in vec3 aMotionVec1;\n"
  99 "\n"
 100 "void compute_motion_vectors()\n"
 101 "{\n"
 102 "   // Write motion vectors\n"
 103 "   vec2 vmotion0 = aMotionVec0.xy / aMotionVec0.z;\n"
 104 "   vec2 vmotion1 = aMotionVec1.xy / aMotionVec1.z;\n"
 105 "\n"
 106 "   oMotionVec = (vmotion1-vmotion0) * (1.0/k_motion_lerp_amount);\n"
 107 "}\n"
 108 "\n"
 109 "#line      4        0 \n"
 110 "\n"
 111 "uniform vec3 uCamera;\n"
 112 "\n"
 113 "in vec4 aColour;\n"
 114 "in vec3 aCo;\n"
 115 "in vec3 aWorldCo;\n"
 116 "\n"
 117 "void main()\n"
 118 "{\n"
 119 "   vec2 ssuv = gl_FragCoord.xy;\n"
 120 "   vec3 vDither = vec3( dot( vec2( 171.0, 231.0 ), ssuv) );\n"
 121 "   float dither = fract( vDither.g / 71.0 ) - 0.5;\n"
 122 "\n"
 123 "   float diff = length(gl_PointCoord.xy-vec2(0.5));\n"
 124 "   if( diff+dither>0.5 )discard;\n"
 125 "\n"
 126 "   compute_motion_vectors();\n"
 127 "   FragColor = aColour;\n"
 128 "}\n"
 129 ""},
 130 };
 131
 132 static GLuint _uniform_point_map_uMdl;
 133 static GLuint _uniform_point_map_uNormMtx;
 134 static GLuint _uniform_point_map_uPv;
 135 static GLuint _uniform_point_map_uPvmPrev;
 136 static GLuint _uniform_point_map_uAnim;
 137 static GLuint _uniform_point_map_uCamera;
 138 static void shader_point_map_uMdl(m4x3f m){
 139    glUniformMatrix4x3fv(_uniform_point_map_uMdl,1,GL_FALSE,(float*)m);
 140 }
 141 static void shader_point_map_uNormMtx(m3x3f m){
 142    glUniformMatrix3fv(_uniform_point_map_uNormMtx,1,GL_FALSE,(float*)m);
 143 }
 144 static void shader_point_map_uPv(m4x4f m){
 145    glUniformMatrix4fv(_uniform_point_map_uPv,1,GL_FALSE,(float*)m);
 146 }
 147 static void shader_point_map_uPvmPrev(m4x4f m){
 148    glUniformMatrix4fv(_uniform_point_map_uPvmPrev,1,GL_FALSE,(float*)m);
 149 }
 150 static void shader_point_map_uAnim(v4f v){
 151    glUniform4fv(_uniform_point_map_uAnim,1,v);
 152 }
 153 static void shader_point_map_uCamera(v3f v){
 154    glUniform3fv(_uniform_point_map_uCamera,1,v);
 155 }
 156 static void shader_point_map_register(void){
 157    vg_shader_register( &_shader_point_map );
 158 }
 159 static void shader_point_map_use(void){ glUseProgram(_shader_point_map.id); }
 160 static void shader_point_map_link(void){
 161    _uniform_point_map_uMdl = glGetUniformLocation( _shader_point_map.id, "uMdl" );
 162    _uniform_point_map_uNormMtx = glGetUniformLocation( _shader_point_map.id, "uNormMtx" );
 163    _uniform_point_map_uPv = glGetUniformLocation( _shader_point_map.id, "uPv" );
 164    _uniform_point_map_uPvmPrev = glGetUniformLocation( _shader_point_map.id, "uPvmPrev" );
 165    _uniform_point_map_uAnim = glGetUniformLocation( _shader_point_map.id, "uAnim" );
 166    _uniform_point_map_uCamera = glGetUniformLocation( _shader_point_map.id, "uCamera" );
 167 }
 168 #endif /* SHADER_point_map_H */