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 "\n"
  20 "uniform mat4x3 uMdl;\n"
  21 "uniform mat4 uPv;\n"
  22 "\n"
  23 "out vec4 aColour;\n"
  24 "out vec2 aUv;\n"
  25 "out vec3 aNorm;\n"
  26 "out vec3 aCo;\n"
  27 "out vec3 aWorldCo;\n"
  28 "\n"
  29 "void main()\n"
  30 "{\n"
  31 "   vec3 world_pos = uMdl * vec4(a_co,1.0);\n"
  32 "   gl_Position = uPv * vec4( world_pos, 1.0 );\n"
  33 "   aColour = a_colour;\n"
  34 "   aUv = a_uv;\n"
  35 "   aNorm = mat3(uMdl) * a_norm;\n"
  36 "   aCo = a_co;\n"
  37 "   aWorldCo = world_pos;\n"
  38 "}\n"
  39 ""},
  40    .fs =
  41 {
  42 .static_src =
  43 "out vec4 FragColor;\n"
  44 "\n"
  45 "uniform vec4 uColour;\n"
  46 "uniform sampler2D uTexGarbage;\n"
  47 "uniform float uTime;\n"
  48 "\n"
  49 "in vec4 aColour;\n"
  50 "in vec2 aUv;\n"
  51 "in vec3 aNorm;\n"
  52 "in vec3 aCo;\n"
  53 "\n"
  54 "void main()\n"
  55 "{\n"
  56 "   float fintensity = 1.0-(abs(aNorm.y)*0.7);\n"
  57 "   float fblend = pow(fintensity,4.0);\n"
  58 "   vec3 horizon = vec3( 0.8, 0.9, 0.9 );\n"
  59 "   vec3 skycolour = vec3( 0.5, 0.6, 0.9 );\n"
  60 "   vec3 diffuse = mix( skycolour, horizon, fblend );\n"
  61 "\n"
  62 "   float fmove = uTime * 0.004;\n"
  63 "   vec2 cloudplane = (aNorm.xz / (aNorm.y*sign(aNorm.y))) * 0.05;\n"
  64 "   vec4 clouds1 = texture( uTexGarbage, cloudplane + vec2(0.1,0.4)*fmove*2.0 );\n"
  65 "   vec4 clouds2 = texture( uTexGarbage, cloudplane + vec2(0.3,0.1)*fmove );\n"
  66 "\n"
  67 "   float cloud_d = max(clouds1.b*clouds2.r -0.2 - clouds2.g*0.4,0.0);\n"
  68 "   float cloud_e = pow(cloud_d,1.5)*pow(abs(aNorm.y),0.3)*2.0;\n"
  69 "\n"
  70 "   vec3 colour_ocean = vec3( 0.61, 0.84, 0.9 );\n"
  71 "   float fhorizon = step( aNorm.y * 0.5 + 0.5, 0.5 );\n"
  72 "\n"
  73 "   vec3 skycomp = mix(diffuse, vec3(1.0,1.0,1.0), cloud_e);\n"
  74 "   FragColor = vec4(pow(skycomp, vec3(1.5)),1.0);\n"
  75 "}\n"
  76 ""},
  77 };
  78
  79 static GLuint _uniform_sky_uMdl;
  80 static GLuint _uniform_sky_uPv;
  81 static GLuint _uniform_sky_uColour;
  82 static GLuint _uniform_sky_uTexGarbage;
  83 static GLuint _uniform_sky_uTime;
  84 static void shader_sky_uMdl(m4x3f m){
  85    glUniformMatrix4x3fv(_uniform_sky_uMdl,1,GL_FALSE,(float*)m);
  86 }
  87 static void shader_sky_uPv(m4x4f m){
  88    glUniformMatrix4fv(_uniform_sky_uPv,1,GL_FALSE,(float*)m);
  89 }
  90 static void shader_sky_uColour(v4f v){
  91    glUniform4fv(_uniform_sky_uColour,1,v);
  92 }
  93 static void shader_sky_uTexGarbage(int i){
  94    glUniform1i(_uniform_sky_uTexGarbage,i);
  95 }
  96 static void shader_sky_uTime(float f){
  97    glUniform1f(_uniform_sky_uTime,f);
  98 }
  99 static void shader_sky_register(void){
 100    vg_shader_register( &_shader_sky );
 101 }
 102 static void shader_sky_use(void){ glUseProgram(_shader_sky.id); }
 103 static void shader_sky_link(void){
 104    _uniform_sky_uMdl = glGetUniformLocation( _shader_sky.id, "uMdl" );
 105    _uniform_sky_uPv = glGetUniformLocation( _shader_sky.id, "uPv" );
 106    _uniform_sky_uColour = glGetUniformLocation( _shader_sky.id, "uColour" );
 107    _uniform_sky_uTexGarbage = glGetUniformLocation( _shader_sky.id, "uTexGarbage" );
 108    _uniform_sky_uTime = glGetUniformLocation( _shader_sky.id, "uTime" );
 109 }
 110 #endif /* SHADER_sky_H */