shaders/gpos.h

   1 #ifndef SHADER_gpos_H
   2 #define SHADER_gpos_H
   3 static void shader_gpos_link(void);
   4 static void shader_gpos_register(void);
   5 static struct vg_shader _shader_gpos = {
   6    .name = "gpos",
   7    .link = shader_gpos_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/gpos.fs",
  39 .static_src =
  40 "out vec4 FragColor;\n"
  41 "\n"
  42 "uniform vec3 uCamera;\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 "#line       1        1 \n"
  50 "layout (std140) uniform ub_world_lighting\n"
  51 "{\n"
  52 "   vec3 g_directional;\n"
  53 "   vec3 g_sun_colour;\n"
  54 "   vec3 g_shadow_colour;\n"
  55 "   vec4 g_water_plane;\n"
  56 "   vec4 g_depth_bounds;\n"
  57 "   float g_water_fog;\n"
  58 "};\n"
  59 "\n"
  60 "uniform sampler2D g_world_depth;\n"
  61 "\n"
  62 "// Standard diffuse + spec models\n"
  63 "// ==============================\n"
  64 "\n"
  65 "vec3 do_light_diffuse( vec3 vfrag, vec3 wnormal )\n"
  66 "{\n"
  67 "   float flight = dot( g_directional, wnormal )*0.5+0.5;\n"
  68 "   return vfrag * mix( g_shadow_colour, g_sun_colour, flight );\n"
  69 "}\n"
  70 "\n"
  71 "vec3 do_light_spec( vec3 vfrag, vec3 wnormal, vec3 halfview, float fintensity )\n"
  72 "{\n"
  73 "   vec3 specdir = reflect( -g_directional, wnormal );\n"
  74 "   float spec = pow(max(dot( halfview, specdir ), 0.0), 10.0);\n"
  75 "   return vfrag + g_sun_colour*spec*fintensity;\n"
  76 "}\n"
  77 "\n"
  78 "float world_depth_sample( vec3 pos )\n"
  79 "{\n"
  80 "   vec2 depth_coord = (pos.xz - g_depth_bounds.xy) * g_depth_bounds.zw; \n"
  81 "   return texture( g_world_depth, depth_coord ).r;\n"
  82 "}\n"
  83 "\n"
  84 "float shadow_sample( vec3 vdir )\n"
  85 "{\n"
  86 "   vec3 sample_pos = aCo + vdir;\n"
  87 "   float height_sample = world_depth_sample( sample_pos );\n"
  88 "\n"
  89 "   float fdelta = height_sample - sample_pos.y;\n"
  90 "   return clamp( fdelta, 0.1, 0.2 )-0.1;\n"
  91 "}\n"
  92 "\n"
  93 "vec3 do_light_shadowing( vec3 vfrag )\n"
  94 "{\n"
  95 "   float faccum = 0.0;\n"
  96 "   faccum += shadow_sample( vec3( 0.0, 0.5, 0.0 ));\n"
  97 "   faccum += shadow_sample( vec3( 2.0, 0.3, 0.0 ));\n"
  98 "   faccum += shadow_sample( vec3( 3.0, 1.0, 0.0 ));\n"
  99 "   faccum += shadow_sample( vec3( 5.0, 1.0, 0.0 ));\n"
 100 "   faccum += shadow_sample( vec3( 0.0, 0.5, 0.0 )*1.5);\n"
 101 "   faccum += shadow_sample( vec3( 2.0, 0.3, 0.0 )*1.5);\n"
 102 "   faccum += shadow_sample( vec3( 3.0, 1.0, 0.0 )*1.5);\n"
 103 "   faccum += shadow_sample( vec3( 5.0, 1.0, 0.0 )*1.5);\n"
 104 "   return mix( vfrag, g_shadow_colour, faccum );\n"
 105 "}\n"
 106 "\n"
 107 "\n"
 108 "#line     11        0 \n"
 109 "\n"
 110 "// Water blending\n"
 111 "// ==============\n"
 112 "\n"
 113 "float water_depth( vec3 pos, vec3 halfview )\n"
 114 "{\n"
 115 "   vec3 pnorm = g_water_plane.xyz;\n"
 116 "   float pdist = g_water_plane.w;\n"
 117 "\n"
 118 "   float d = dot( pnorm, halfview );\n"
 119 "   float t = dot((pnorm*pdist - pos), pnorm) / d;\n"
 120 "   return t * g_water_fog;\n"
 121 "}\n"
 122 "\n"
 123 "void main()\n"
 124 "{\n"
 125 "   vec3 halfview = normalize( uCamera - aCo );\n"
 126 "   vec3 world_pos = vec3( aCo.y, aCo.x, aCo.z );\n"
 127 "   FragColor = vec4( world_pos, water_depth( aCo, halfview ) );\n"
 128 "}\n"
 129 ""},
 130 };
 131
 132 static GLuint _uniform_gpos_uPv;
 133 static GLuint _uniform_gpos_uMdl;
 134 static GLuint _uniform_gpos_uCamera;
 135 static GLuint _uniform_gpos_g_world_depth;
 136 static void shader_gpos_uPv(m4x4f m){
 137    glUniformMatrix4fv( _uniform_gpos_uPv, 1, GL_FALSE, (float *)m );
 138 }
 139 static void shader_gpos_uMdl(m4x3f m){
 140    glUniformMatrix4x3fv( _uniform_gpos_uMdl, 1, GL_FALSE, (float *)m );
 141 }
 142 static void shader_gpos_uCamera(v3f v){
 143    glUniform3fv( _uniform_gpos_uCamera, 1, v );
 144 }
 145 static void shader_gpos_g_world_depth(int i){
 146    glUniform1i( _uniform_gpos_g_world_depth, i );
 147 }
 148 static void shader_gpos_register(void){
 149    vg_shader_register( &_shader_gpos );
 150 }
 151 static void shader_gpos_use(void){ glUseProgram(_shader_gpos.id); }
 152 static void shader_gpos_link(void){
 153    _uniform_gpos_uPv = glGetUniformLocation( _shader_gpos.id, "uPv" );
 154    _uniform_gpos_uMdl = glGetUniformLocation( _shader_gpos.id, "uMdl" );
 155    _uniform_gpos_uCamera = glGetUniformLocation( _shader_gpos.id, "uCamera" );
 156    _uniform_gpos_g_world_depth = glGetUniformLocation( _shader_gpos.id, "g_world_depth" );
 157 }
 158 #endif /* SHADER_gpos_H */