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 "\n"
  44 "in vec4 aColour;\n"
  45 "in vec2 aUv;\n"
  46 "in vec3 aNorm;\n"
  47 "in vec3 aCo;\n"
  48 "\n"
  49 "void main()\n"
  50 "{\n"
  51 "   float fintensity = 1.0-(abs(aNorm.y)*0.7);\n"
  52 "   float angle = -dot(vec3(0.95,0.0,-0.3),aNorm)*0.5+0.5;\n"
  53 "   float fblend = pow(fintensity,6.0) * angle;\n"
  54 "   vec3 horizon = vec3(0.9,0.9,0.8);\n"
  55 "   vec3 skycolour = vec3(0.4,0.5,0.8);\n"
  56 "   vec3 diffuse = mix( skycolour, horizon, fblend );\n"
  57 "\n"
  58 "   FragColor = vec4(diffuse,1.0);\n"
  59 "}\n"
  60 ""},
  61 };
  62
  63 static GLuint _uniform_sky_uPv;
  64 static GLuint _uniform_sky_uMdl;
  65 static GLuint _uniform_sky_uColour;
  66 static void shader_sky_uPv(m4x4f m){
  67    glUniformMatrix4fv( _uniform_sky_uPv, 1, GL_FALSE, (float *)m );
  68 }
  69 static void shader_sky_uMdl(m4x3f m){
  70    glUniformMatrix4x3fv( _uniform_sky_uMdl, 1, GL_FALSE, (float *)m );
  71 }
  72 static void shader_sky_uColour(v4f v){
  73    glUniform4fv( _uniform_sky_uColour, 1, v );
  74 }
  75 static void shader_sky_register(void){
  76    vg_shader_register( &_shader_sky );
  77 }
  78 static void shader_sky_use(void){ glUseProgram(_shader_sky.id); }
  79 static void shader_sky_link(void){
  80    _uniform_sky_uPv = glGetUniformLocation( _shader_sky.id, "uPv" );
  81    _uniform_sky_uMdl = glGetUniformLocation( _shader_sky.id, "uMdl" );
  82    _uniform_sky_uColour = glGetUniformLocation( _shader_sky.id, "uColour" );
  83 }
  84 #endif /* SHADER_sky_H */