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 vec2 uTime;\n"
  40 "uniform vec4 uTransform;\n"
  41 "\n"
  42 "out vec4 aColour;\n"
  43 "out vec3 aWorldCo;\n"
  44 "out vec3 aCo;\n"
  45 "\n"
  46 "vec2 rand_hash22( vec2 p )\n"
  47 "{\n"
  48 "   vec3 p3 = fract(vec3(p.xyx) * 213.8976123);\n"
  49 "   p3 += dot(p3, p3.yzx+19.19);\n"
  50 "   return fract(vec2((p3.x + p3.y)*p3.z, (p3.x+p3.z)*p3.y));\n"
  51 "}\n"
  52 "\n"
  53 "vec3 mapP( vec3 p )\n"
  54 "{\n"
  55 "   return p;\n"
  56 "   float t = max(0.0,uTime.y);\n"
  57 "\n"
  58 "   vec3 lco = p * 20.0;\n"
  59 "   vec3 grid = vec3(floor(lco.x),lco.y,floor(lco.z));//fract(p);\n"
  60 "\n"
  61 "   return mix(p,grid * (1.0/20.0), t)*vec3(1.0+t,1.0-t,1.0+t);\n"
  62 "}\n"
  63 "\n"
  64 "void main()\n"
  65 "{\n"
  66 "   vec3 mco = a_co.xyz * uTransform.w + uTransform.xyz;\n"
  67 "\n"
  68 "\n"
  69 "   vec3 center = vec3(0.5);\n"
  70 "   vec3 lco = mapP(mco);\n"
  71 "\n"
  72 "   vec3 world_pos0 = uMdl     * vec4( mco, 1.0 );\n"
  73 "   vec4 vproj0     = uPv      * vec4( world_pos0, 1.0 );\n"
  74 "   vec4 vproj1     = uPvmPrev * vec4( mco, 1.0 );\n"
  75 "\n"
  76 "   float t = max(0.0,uTime.y);\n"
  77 "   float scaler = smoothstep(0.6,0.58,length(lco.xz));\n"
  78 "\n"
  79 "   vs_motion_out( vproj0, vproj1 );\n"
  80 "\n"
  81 "   gl_Position = vproj0;\n"
  82 "   gl_PointSize = (9.0*uTransform.w*scaler) / (gl_Position.z + 0.01);\n"
  83 "   aWorldCo = world_pos0;\n"
  84 "   aColour = a_colour*scaler;\n"
  85 "   aCo = mco;\n"
  86 "}\n"
  87 ""},
  88    .fs =
  89 {
  90 .orig_file = "shaders/cloud.fs",
  91 .static_src =
  92 "out vec4 FragColor;\n"
  93 "\n"
  94 "#line       1        1 \n"
  95 "const float k_motion_lerp_amount = 0.01;\n"
  96 "\n"
  97 "#line      2        0 \n"
  98 "\n"
  99 "layout (location = 1) out vec2 oMotionVec;\n"
 100 "\n"
 101 "in vec3 aMotionVec0;\n"
 102 "in vec3 aMotionVec1;\n"
 103 "\n"
 104 "void compute_motion_vectors()\n"
 105 "{\n"
 106 "   // Write motion vectors\n"
 107 "   vec2 vmotion0 = aMotionVec0.xy / aMotionVec0.z;\n"
 108 "   vec2 vmotion1 = aMotionVec1.xy / aMotionVec1.z;\n"
 109 "\n"
 110 "   oMotionVec = (vmotion1-vmotion0) * (1.0/k_motion_lerp_amount);\n"
 111 "}\n"
 112 "\n"
 113 "#line      4        0 \n"
 114 "\n"
 115 "uniform vec3 uCamera;\n"
 116 "\n"
 117 "in vec4 aColour;\n"
 118 "in vec3 aCo;\n"
 119 "in vec3 aWorldCo;\n"
 120 "\n"
 121 "void main()\n"
 122 "{\n"
 123 "   vec2 ssuv = gl_FragCoord.xy;\n"
 124 "   vec3 vDither = vec3( dot( vec2( 171.0, 231.0 ), ssuv) );\n"
 125 "   float dither = fract( vDither.g / 71.0 ) - 0.5;\n"
 126 "\n"
 127 "   float diff = length(gl_PointCoord.xy-vec2(0.5));\n"
 128 "   if( diff+dither>0.5 )discard;\n"
 129 "\n"
 130 "   compute_motion_vectors();\n"
 131 "   FragColor = aColour;\n"
 132 "}\n"
 133 ""},
 134 };
 135
 136 static GLuint _uniform_point_map_uMdl;
 137 static GLuint _uniform_point_map_uNormMtx;
 138 static GLuint _uniform_point_map_uPv;
 139 static GLuint _uniform_point_map_uPvmPrev;
 140 static GLuint _uniform_point_map_uTime;
 141 static GLuint _uniform_point_map_uTransform;
 142 static GLuint _uniform_point_map_uCamera;
 143 static void shader_point_map_uMdl(m4x3f m){
 144    glUniformMatrix4x3fv(_uniform_point_map_uMdl,1,GL_FALSE,(float*)m);
 145 }
 146 static void shader_point_map_uNormMtx(m3x3f m){
 147    glUniformMatrix3fv(_uniform_point_map_uNormMtx,1,GL_FALSE,(float*)m);
 148 }
 149 static void shader_point_map_uPv(m4x4f m){
 150    glUniformMatrix4fv(_uniform_point_map_uPv,1,GL_FALSE,(float*)m);
 151 }
 152 static void shader_point_map_uPvmPrev(m4x4f m){
 153    glUniformMatrix4fv(_uniform_point_map_uPvmPrev,1,GL_FALSE,(float*)m);
 154 }
 155 static void shader_point_map_uTime(v2f v){
 156    glUniform2fv(_uniform_point_map_uTime,1,v);
 157 }
 158 static void shader_point_map_uTransform(v4f v){
 159    glUniform4fv(_uniform_point_map_uTransform,1,v);
 160 }
 161 static void shader_point_map_uCamera(v3f v){
 162    glUniform3fv(_uniform_point_map_uCamera,1,v);
 163 }
 164 static void shader_point_map_register(void){
 165    vg_shader_register( &_shader_point_map );
 166 }
 167 static void shader_point_map_use(void){ glUseProgram(_shader_point_map.id); }
 168 static void shader_point_map_link(void){
 169    _uniform_point_map_uMdl = glGetUniformLocation( _shader_point_map.id, "uMdl" );
 170    _uniform_point_map_uNormMtx = glGetUniformLocation( _shader_point_map.id, "uNormMtx" );
 171    _uniform_point_map_uPv = glGetUniformLocation( _shader_point_map.id, "uPv" );
 172    _uniform_point_map_uPvmPrev = glGetUniformLocation( _shader_point_map.id, "uPvmPrev" );
 173    _uniform_point_map_uTime = glGetUniformLocation( _shader_point_map.id, "uTime" );
 174    _uniform_point_map_uTransform = glGetUniformLocation( _shader_point_map.id, "uTransform" );
 175    _uniform_point_map_uCamera = glGetUniformLocation( _shader_point_map.id, "uCamera" );
 176 }
 177 #endif /* SHADER_point_map_H */