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 "   vec4 g_light_colours[3];\n"
  53 "   vec4 g_light_directions[3];\n"
  54 "   vec4 g_ambient_colour;\n"
  55 "\n"
  56 "   vec4 g_water_plane;\n"
  57 "   vec4 g_depth_bounds;\n"
  58 "   float g_water_fog;\n"
  59 "   int g_light_count;\n"
  60 "   int g_light_preview;\n"
  61 "};\n"
  62 "\n"
  63 "uniform sampler2D g_world_depth;\n"
  64 "\n"
  65 "// Standard diffuse + spec models\n"
  66 "// ==============================\n"
  67 "\n"
  68 "vec3 do_light_diffuse( vec3 vfrag, vec3 wnormal )\n"
  69 "{\n"
  70 "   vec3 vtotal = g_ambient_colour.rgb;\n"
  71 "\n"
  72 "   for( int i=0; i<g_light_count; i++ )\n"
  73 "   {\n"
  74 "      vec3 vcolour = g_light_colours[i].rgb;\n"
  75 "      vec3 vdir = g_light_directions[i].xyz;\n"
  76 "\n"
  77 "      float flight = max(dot( vdir, wnormal )*0.75+0.25,0.0);\n"
  78 "      vtotal += vcolour*flight;\n"
  79 "   }\n"
  80 "\n"
  81 "   return vfrag * vtotal;\n"
  82 "}\n"
  83 "\n"
  84 "vec3 do_light_spec( vec3 vfrag, vec3 wnormal, vec3 halfview, float fintensity )\n"
  85 "{\n"
  86 "   vec3 vcolour = g_light_colours[0].rgb;\n"
  87 "   vec3 vdir = g_light_directions[0].xyz;\n"
  88 "\n"
  89 "   vec3 specdir = reflect( -vdir, wnormal );\n"
  90 "   float spec = pow(max(dot( halfview, specdir ), 0.0), 10.0);\n"
  91 "   return vfrag + vcolour*spec*fintensity;\n"
  92 "}\n"
  93 "\n"
  94 "float world_depth_sample( vec3 pos )\n"
  95 "{\n"
  96 "   vec2 depth_coord = (pos.xz - g_depth_bounds.xy) * g_depth_bounds.zw; \n"
  97 "   return texture( g_world_depth, depth_coord ).r;\n"
  98 "}\n"
  99 "\n"
 100 "float shadow_sample( vec3 vdir )\n"
 101 "{\n"
 102 "   vec3 sample_pos = aCo + vdir;\n"
 103 "   float height_sample = world_depth_sample( sample_pos );\n"
 104 "\n"
 105 "   float fdelta = height_sample - sample_pos.y;\n"
 106 "   return clamp( fdelta, 0.1, 0.2 )-0.1;\n"
 107 "}\n"
 108 "\n"
 109 "vec3 do_light_shadowing_old( vec3 vfrag )\n"
 110 "{\n"
 111 "   float faccum = 0.0;\n"
 112 "   faccum += shadow_sample( vec3( 0.0, 0.5, 0.0 ));\n"
 113 "   faccum += shadow_sample( vec3( 2.0, 0.3, 0.0 ));\n"
 114 "   faccum += shadow_sample( vec3( 3.0, 1.0, 0.0 ));\n"
 115 "   faccum += shadow_sample( vec3( 5.0, 1.0, 0.0 ));\n"
 116 "   faccum += shadow_sample( vec3( 0.0, 0.5, 0.0 )*1.5);\n"
 117 "   faccum += shadow_sample( vec3( 2.0, 0.3, 0.0 )*1.5);\n"
 118 "   faccum += shadow_sample( vec3( 3.0, 1.0, 0.0 )*1.5);\n"
 119 "   faccum += shadow_sample( vec3( 5.0, 1.0, 0.0 )*1.5);\n"
 120 "   return mix( vfrag, g_ambient_colour.rgb, faccum );\n"
 121 "}\n"
 122 "\n"
 123 "vec3 do_light_shadowing( vec3 vfrag )\n"
 124 "{\n"
 125 "   float fspread = g_light_colours[0].w;\n"
 126 "   vec3  vdir = g_light_directions[0].xyz;\n"
 127 "   float flength = g_light_directions[0].w;\n"
 128 "\n"
 129 "   float famt = 0.0;\n"
 130 "   famt+=shadow_sample((vdir+vec3(-0.563, 0.550, 0.307)*fspread)*flength*0.1);\n"
 131 "   famt+=shadow_sample((vdir+vec3( 0.808, 0.686, 0.346)*fspread)*flength*0.2);\n"
 132 "   famt+=shadow_sample((vdir+vec3( 0.787, 0.074,-0.065)*fspread)*flength*0.3);\n"
 133 "   famt+=shadow_sample((vdir+vec3(-0.593, 0.071,-0.425)*fspread)*flength*0.4);\n"
 134 "   famt+=shadow_sample((vdir+vec3(-0.790,-0.933,-0.875)*fspread)*flength*0.5);\n"
 135 "   famt+=shadow_sample((vdir+vec3( 0.807,-0.690, 0.472)*fspread)*flength*0.6);\n"
 136 "   famt+=shadow_sample((vdir+vec3( 0.522,-0.379, 0.350)*fspread)*flength*0.7);\n"
 137 "   famt+=shadow_sample((vdir+vec3( 0.483, 0.201, 0.306)*fspread)*flength*0.8);\n"
 138 "   return mix( vfrag, g_ambient_colour.rgb, famt );\n"
 139 "}\n"
 140 "\n"
 141 "vec3 apply_fog( vec3 vfrag, float fdist )\n"
 142 "{\n"
 143 "   float dist = pow(fdist*0.0008,1.2);\n"
 144 "   return mix( vfrag, vec3(0.55,0.76,1.0), min( 1.0, dist ) );\n"
 145 "}\n"
 146 "\n"
 147 "#line     11        0 \n"
 148 "\n"
 149 "// Water blending\n"
 150 "// ==============\n"
 151 "\n"
 152 "float water_depth( vec3 pos, vec3 halfview )\n"
 153 "{\n"
 154 "   vec3 pnorm = g_water_plane.xyz;\n"
 155 "   float pdist = g_water_plane.w;\n"
 156 "\n"
 157 "   float d = dot( pnorm, halfview );\n"
 158 "   float t = dot((pnorm*pdist - pos), pnorm) / d;\n"
 159 "   return t * g_water_fog;\n"
 160 "}\n"
 161 "\n"
 162 "void main()\n"
 163 "{\n"
 164 "   vec3 halfview = normalize( uCamera - aCo );\n"
 165 "   vec3 world_pos = vec3( aCo.y, aCo.x, aCo.z );\n"
 166 "   FragColor = vec4( world_pos, water_depth( aCo, halfview ) );\n"
 167 "}\n"
 168 ""},
 169 };
 170
 171 static GLuint _uniform_gpos_uPv;
 172 static GLuint _uniform_gpos_uMdl;
 173 static GLuint _uniform_gpos_uCamera;
 174 static GLuint _uniform_gpos_g_world_depth;
 175 static void shader_gpos_uPv(m4x4f m){
 176    glUniformMatrix4fv( _uniform_gpos_uPv, 1, GL_FALSE, (float *)m );
 177 }
 178 static void shader_gpos_uMdl(m4x3f m){
 179    glUniformMatrix4x3fv( _uniform_gpos_uMdl, 1, GL_FALSE, (float *)m );
 180 }
 181 static void shader_gpos_uCamera(v3f v){
 182    glUniform3fv( _uniform_gpos_uCamera, 1, v );
 183 }
 184 static void shader_gpos_g_world_depth(int i){
 185    glUniform1i( _uniform_gpos_g_world_depth, i );
 186 }
 187 static void shader_gpos_register(void){
 188    vg_shader_register( &_shader_gpos );
 189 }
 190 static void shader_gpos_use(void){ glUseProgram(_shader_gpos.id); }
 191 static void shader_gpos_link(void){
 192    _uniform_gpos_uPv = glGetUniformLocation( _shader_gpos.id, "uPv" );
 193    _uniform_gpos_uMdl = glGetUniformLocation( _shader_gpos.id, "uMdl" );
 194    _uniform_gpos_uCamera = glGetUniformLocation( _shader_gpos.id, "uCamera" );
 195    _uniform_gpos_g_world_depth = glGetUniformLocation( _shader_gpos.id, "g_world_depth" );
 196 }
 197 #endif /* SHADER_gpos_H */