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 .orig_file = "../shaders/standard.vs",
  11 .static_src =
  12 "layout (location=0) in vec3 a_co;\n"
  13 "layout (location=1) in vec3 a_norm;\n"
  14 "layout (location=2) in vec4 a_colour;\n"
  15 "layout (location=3) in vec2 a_uv;\n"
  16 "\n"
  17 "#line      2        0 \n"
  18 "\n"
  19 "uniform mat4 uPv;\n"
  20 "uniform mat4x3 uMdl;\n"
  21 "\n"
  22 "out vec4 aColour;\n"
  23 "out vec2 aUv;\n"
  24 "out vec3 aNorm;\n"
  25 "out vec3 aCo;\n"
  26 "\n"
  27 "void main()\n"
  28 "{\n"
  29 "   gl_Position = uPv * vec4( uMdl * vec4(a_co,1.0), 1.0 );\n"
  30 "   aColour = a_colour;\n"
  31 "   aUv = a_uv;\n"
  32 "   aNorm = mat3(uMdl) * a_norm;\n"
  33 "   aCo = a_co;\n"
  34 "}\n"
  35 ""},
  36    .fs =
  37 {
  38 .orig_file = "../shaders/sky.fs",
  39 .static_src =
  40 "out vec4 FragColor;\n"
  41 "\n"
  42 "uniform vec4 uColour;\n"
  43 "uniform sampler2D uTexGarbage;\n"
  44 "uniform float uTime;\n"
  45 "\n"
  46 "in vec4 aColour;\n"
  47 "in vec2 aUv;\n"
  48 "in vec3 aNorm;\n"
  49 "in vec3 aCo;\n"
  50 "\n"
  51 "void main()\n"
  52 "{\n"
  53 "   float fintensity = 1.0-(abs(aNorm.y)*0.7);\n"
  54 "   float fblend = pow(fintensity,6.0);\n"
  55 "   vec3 horizon = vec3( 0.61, 0.71, 0.86 )*1.5;\n"
  56 "   vec3 skycolour = vec3( 0.31, 0.56, 0.91 );\n"
  57 "   vec3 diffuse = mix( skycolour, horizon, fblend );\n"
  58 "\n"
  59 "   float fmove = uTime * 0.004;\n"
  60 "   vec2 cloudplane = (aCo.xz / (aCo.y*sign(aNorm.y))) * 0.03;\n"
  61 "   vec4 clouds1 = texture( uTexGarbage, cloudplane + vec2(0.1,0.4)*fmove*2.0 );\n"
  62 "   vec4 clouds2 = texture( uTexGarbage, cloudplane + vec2(0.3,0.1)*fmove );\n"
  63 "\n"
  64 "   float cloud_d = max(clouds1.b*clouds2.r -0.2 - clouds2.g*0.4,0.0);\n"
  65 "   float cloud_e = pow(cloud_d,1.5)*pow(abs(aNorm.y),0.3)*2.0;\n"
  66 "\n"
  67 "   vec3 colour_ocean = vec3( 0.61, 0.84, 0.9 );\n"
  68 "   float fhorizon = step( aNorm.y * 0.5 + 0.5, 0.5 );\n"
  69 "\n"
  70 "   vec3 skycomp = mix(diffuse, vec3(1.0,1.0,1.0), cloud_e);\n"
  71 "   skycomp = mix(mix(pow(colour_ocean,vec3(6.0))*0.6,skycomp, 0.7),skycomp,fhorizon);\n"
  72 "\n"
  73 "   FragColor = vec4(skycomp, 0.0);\n"
  74 "}\n"
  75 ""},
  76 };
  77
  78 static GLuint _uniform_sky_uPv;
  79 static GLuint _uniform_sky_uMdl;
  80 static GLuint _uniform_sky_uColour;
  81 static GLuint _uniform_sky_uTexGarbage;
  82 static GLuint _uniform_sky_uTime;
  83 static void shader_sky_uPv(m4x4f m){
  84    glUniformMatrix4fv( _uniform_sky_uPv, 1, GL_FALSE, (float *)m );
  85 }
  86 static void shader_sky_uMdl(m4x3f m){
  87    glUniformMatrix4x3fv( _uniform_sky_uMdl, 1, GL_FALSE, (float *)m );
  88 }
  89 static void shader_sky_uColour(v4f v){
  90    glUniform4fv( _uniform_sky_uColour, 1, v );
  91 }
  92 static void shader_sky_uTexGarbage(int i){
  93    glUniform1i( _uniform_sky_uTexGarbage, i );
  94 }
  95 static void shader_sky_uTime(float f){
  96    glUniform1f( _uniform_sky_uTime, f );
  97 }
  98 static void shader_sky_register(void){
  99    vg_shader_register( &_shader_sky );
 100 }
 101 static void shader_sky_use(void){ glUseProgram(_shader_sky.id); }
 102 static void shader_sky_link(void){
 103    _uniform_sky_uPv = glGetUniformLocation( _shader_sky.id, "uPv" );
 104    _uniform_sky_uMdl = glGetUniformLocation( _shader_sky.id, "uMdl" );
 105    _uniform_sky_uColour = glGetUniformLocation( _shader_sky.id, "uColour" );
 106    _uniform_sky_uTexGarbage = glGetUniformLocation( _shader_sky.id, "uTexGarbage" );
 107    _uniform_sky_uTime = glGetUniformLocation( _shader_sky.id, "uTime" );
 108 }
 109 #endif /* SHADER_sky_H */