shaders/sky.h

   1 #ifndef SHADER_sky_H
   2 #define SHADER_sky_H
   3 static void shader_sky_link(void);
   4 static void shader_sky_register(void);
   5 static struct vg_shader _shader_sky = {
   6    .name = "sky",
   7    .link = shader_sky_link,
   8    .vs =
   9 {
  10 .static_src =
  11 "layout (location=0) in vec3 a_co;\n"
  12 "layout (location=1) in vec3 a_norm;\n"
  13 "layout (location=2) in vec2 a_uv;\n"
  14 "layout (location=3) in vec4 a_colour;\n"
  15 "layout (location=4) in vec4 a_weights;\n"
  16 "layout (location=5) in ivec4 a_groups;\n"
  17 "\n"
  18 "#line      2        0 \n"
  19 "#line       1        2 \n"
  20 "const float k_motion_lerp_amount = 0.01;\n"
  21 "\n"
  22 "#line      2        0 \n"
  23 "\n"
  24 "out vec3 aMotionVec0;\n"
  25 "out vec3 aMotionVec1;\n"
  26 "\n"
  27 "void vs_motion_out( vec4 vproj0, vec4 vproj1 )\n"
  28 "{\n"
  29 "   // This magically solves some artifacting errors!\n"
  30 "   //\n"
  31 "   vproj1 = vproj0*(1.0-k_motion_lerp_amount) + vproj1*k_motion_lerp_amount;\n"
  32 "\n"
  33 "   aMotionVec0 = vec3( vproj0.xy, vproj0.w );\n"
  34 "   aMotionVec1 = vec3( vproj1.xy, vproj1.w );\n"
  35 "}\n"
  36 "\n"
  37 "#line      3        0 \n"
  38 "\n"
  39 "uniform mat4x3 uMdl;\n"
  40 "uniform mat4 uPv;\n"
  41 "uniform mat4 uPvmPrev;\n"
  42 "\n"
  43 "out vec4 aColour;\n"
  44 "out vec2 aUv;\n"
  45 "out vec3 aNorm;\n"
  46 "out vec3 aCo;\n"
  47 "out vec3 aWorldCo;\n"
  48 "\n"
  49 "void main()\n"
  50 "{\n"
  51 "   vec3 world_pos0 = uMdl     * vec4( a_co, 1.0 );\n"
  52 "   vec4 vproj0     = uPv      * vec4( world_pos0, 1.0 );\n"
  53 "   vec4 vproj1     = uPvmPrev * vec4( a_co, 1.0 );\n"
  54 "\n"
  55 "   vs_motion_out( vproj0, vproj1 );\n"
  56 "\n"
  57 "   gl_Position = vproj0;\n"
  58 "   aWorldCo = world_pos0;\n"
  59 "   aColour = a_colour;\n"
  60 "   aUv = a_uv;\n"
  61 "   aNorm = mat3(uMdl) * a_norm;\n"
  62 "   aCo = a_co;\n"
  63 "}\n"
  64 ""},
  65    .fs =
  66 {
  67 .static_src =
  68 "layout (location = 0) out vec4 oColour;\n"
  69 "\n"
  70 "uniform vec4 uColour;\n"
  71 "uniform sampler2D uTexGarbage;\n"
  72 "uniform float uTime;\n"
  73 "\n"
  74 "in vec4 aColour;\n"
  75 "in vec2 aUv;\n"
  76 "in vec3 aNorm;\n"
  77 "in vec3 aCo;\n"
  78 "\n"
  79 "#line       1        1 \n"
  80 "const float k_motion_lerp_amount = 0.01;\n"
  81 "\n"
  82 "#line      2        0 \n"
  83 "\n"
  84 "layout (location = 1) out vec2 oMotionVec;\n"
  85 "\n"
  86 "in vec3 aMotionVec0;\n"
  87 "in vec3 aMotionVec1;\n"
  88 "\n"
  89 "void compute_motion_vectors()\n"
  90 "{\n"
  91 "   // Write motion vectors\n"
  92 "   vec2 vmotion0 = aMotionVec0.xy / aMotionVec0.z;\n"
  93 "   vec2 vmotion1 = aMotionVec1.xy / aMotionVec1.z;\n"
  94 "\n"
  95 "   oMotionVec = (vmotion1-vmotion0) * (1.0/k_motion_lerp_amount);\n"
  96 "}\n"
  97 "\n"
  98 "#line     13        0 \n"
  99 "\n"
 100 "void main()\n"
 101 "{\n"
 102 "   compute_motion_vectors();\n"
 103 "\n"
 104 "   float fintensity = 1.0-(abs(aNorm.y)*0.7);\n"
 105 "   float fblend = pow(fintensity,4.0);\n"
 106 "   vec3 horizon = vec3( 0.8, 0.9, 0.9 );\n"
 107 "   vec3 skycolour = vec3( 0.5, 0.6, 0.9 );\n"
 108 "   vec3 diffuse = mix( skycolour, horizon, fblend );\n"
 109 "\n"
 110 "   float fmove = uTime * 0.004;\n"
 111 "   vec2 cloudplane = (aNorm.xz / (aNorm.y*sign(aNorm.y))) * 0.05;\n"
 112 "   vec4 clouds1 = texture( uTexGarbage, cloudplane + vec2(0.1,0.4)*fmove*2.0 );\n"
 113 "   vec4 clouds2 = texture( uTexGarbage, cloudplane + vec2(0.3,0.1)*fmove );\n"
 114 "\n"
 115 "   float cloud_d = max(clouds1.b*clouds2.r -0.2 - clouds2.g*0.4,0.0);\n"
 116 "   float cloud_e = pow(cloud_d,1.5)*pow(abs(aNorm.y),0.3)*2.0;\n"
 117 "\n"
 118 "   vec3 colour_ocean = vec3( 0.61, 0.84, 0.9 );\n"
 119 "   float fhorizon = step( aNorm.y * 0.5 + 0.5, 0.5 );\n"
 120 "\n"
 121 "   vec3 skycomp = mix(diffuse, vec3(1.0,1.0,1.0), cloud_e);\n"
 122 "   oColour = vec4(pow(skycomp, vec3(1.5)),1.0);\n"
 123 "}\n"
 124 ""},
 125 };
 126
 127 static GLuint _uniform_sky_uMdl;
 128 static GLuint _uniform_sky_uPv;
 129 static GLuint _uniform_sky_uPvmPrev;
 130 static GLuint _uniform_sky_uColour;
 131 static GLuint _uniform_sky_uTexGarbage;
 132 static GLuint _uniform_sky_uTime;
 133 static void shader_sky_uMdl(m4x3f m){
 134    glUniformMatrix4x3fv(_uniform_sky_uMdl,1,GL_FALSE,(float*)m);
 135 }
 136 static void shader_sky_uPv(m4x4f m){
 137    glUniformMatrix4fv(_uniform_sky_uPv,1,GL_FALSE,(float*)m);
 138 }
 139 static void shader_sky_uPvmPrev(m4x4f m){
 140    glUniformMatrix4fv(_uniform_sky_uPvmPrev,1,GL_FALSE,(float*)m);
 141 }
 142 static void shader_sky_uColour(v4f v){
 143    glUniform4fv(_uniform_sky_uColour,1,v);
 144 }
 145 static void shader_sky_uTexGarbage(int i){
 146    glUniform1i(_uniform_sky_uTexGarbage,i);
 147 }
 148 static void shader_sky_uTime(float f){
 149    glUniform1f(_uniform_sky_uTime,f);
 150 }
 151 static void shader_sky_register(void){
 152    vg_shader_register( &_shader_sky );
 153 }
 154 static void shader_sky_use(void){ glUseProgram(_shader_sky.id); }
 155 static void shader_sky_link(void){
 156    _uniform_sky_uMdl = glGetUniformLocation( _shader_sky.id, "uMdl" );
 157    _uniform_sky_uPv = glGetUniformLocation( _shader_sky.id, "uPv" );
 158    _uniform_sky_uPvmPrev = glGetUniformLocation( _shader_sky.id, "uPvmPrev" );
 159    _uniform_sky_uColour = glGetUniformLocation( _shader_sky.id, "uColour" );
 160    _uniform_sky_uTexGarbage = glGetUniformLocation( _shader_sky.id, "uTexGarbage" );
 161    _uniform_sky_uTime = glGetUniformLocation( _shader_sky.id, "uTime" );
 162 }
 163 #endif /* SHADER_sky_H */