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 .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 "#line       1        2 \n"
  20 "const float k_motion_lerp_amount = 0.01;\n"
  21 "\n"
  22 "#line      2        0 \n"
  23 "\n"
  24 "out vec3 aMotionVec0;\n"
  25 "out vec3 aMotionVec1;\n"
  26 "\n"
  27 "void vs_motion_out( vec4 vproj0, vec4 vproj1 )\n"
  28 "{\n"
  29 "   // This magically solves some artifacting errors!\n"
  30 "   //\n"
  31 "   vproj1 = vproj0*(1.0-k_motion_lerp_amount) + vproj1*k_motion_lerp_amount;\n"
  32 "\n"
  33 "   aMotionVec0 = vec3( vproj0.xy, vproj0.w );\n"
  34 "   aMotionVec1 = vec3( vproj1.xy, vproj1.w );\n"
  35 "}\n"
  36 "\n"
  37 "#line      3        0 \n"
  38 "\n"
  39 "uniform mat4x3 uMdl;\n"
  40 "uniform mat4 uPv;\n"
  41 "uniform mat4 uPvmPrev;\n"
  42 "\n"
  43 "out vec4 aColour;\n"
  44 "out vec2 aUv;\n"
  45 "out vec3 aNorm;\n"
  46 "out vec3 aCo;\n"
  47 "out vec3 aWorldCo;\n"
  48 "\n"
  49 "void main()\n"
  50 "{\n"
  51 "   vec3 world_pos0 = uMdl     * vec4( a_co, 1.0 );\n"
  52 "   vec4 vproj0     = uPv      * vec4( world_pos0, 1.0 );\n"
  53 "   vec4 vproj1     = uPvmPrev * vec4( a_co, 1.0 );\n"
  54 "\n"
  55 "   vs_motion_out( vproj0, vproj1 );\n"
  56 "\n"
  57 "   gl_Position = vproj0;\n"
  58 "   aWorldCo = world_pos0;\n"
  59 "   aColour = a_colour;\n"
  60 "   aUv = a_uv;\n"
  61 "   aNorm = mat3(uMdl) * a_norm;\n"
  62 "   aCo = a_co;\n"
  63 "}\n"
  64 ""},
  65    .fs =
  66 {
  67 .static_src =
  68 "out vec4 FragColor;\n"
  69 "\n"
  70 "uniform vec3 uCamera;\n"
  71 "uniform vec3 uBoard0;\n"
  72 "uniform vec3 uBoard1;\n"
  73 "\n"
  74 "in vec4 aColour;\n"
  75 "in vec2 aUv;\n"
  76 "in vec3 aNorm;\n"
  77 "in vec3 aCo;\n"
  78 "in vec3 aWorldCo;\n"
  79 "\n"
  80 "#line       1        1 \n"
  81 "layout (location = 0) out vec4 oColour;\n"
  82 "\n"
  83 "layout (std140) uniform ub_world_lighting\n"
  84 "{\n"
  85 "   vec4 g_light_colours[3];\n"
  86 "   vec4 g_light_directions[3];\n"
  87 "   vec4 g_ambient_colour;\n"
  88 "\n"
  89 "   vec4 g_water_plane;\n"
  90 "   vec4 g_depth_bounds;\n"
  91 "   float g_water_fog;\n"
  92 "   int g_light_count;\n"
  93 "   int g_light_preview;\n"
  94 "   int g_shadow_samples;\n"
  95 "};\n"
  96 "\n"
  97 "uniform sampler2D g_world_depth;\n"
  98 "\n"
  99 "// Standard diffuse + spec models\n"
 100 "// ==============================\n"
 101 "\n"
 102 "vec3 do_light_diffuse( vec3 vfrag, vec3 wnormal )\n"
 103 "{\n"
 104 "   vec3 vtotal = g_ambient_colour.rgb;\n"
 105 "\n"
 106 "   for( int i=0; i<g_light_count; i++ )\n"
 107 "   {\n"
 108 "      vec3 vcolour = g_light_colours[i].rgb;\n"
 109 "      vec3 vdir = g_light_directions[i].xyz;\n"
 110 "\n"
 111 "      float flight = max(dot( vdir, wnormal )*0.75+0.25,0.0);\n"
 112 "      vtotal += vcolour*flight;\n"
 113 "   }\n"
 114 "\n"
 115 "   return vfrag * vtotal;\n"
 116 "}\n"
 117 "\n"
 118 "vec3 do_light_spec( vec3 vfrag, vec3 wnormal, vec3 halfview, float fintensity )\n"
 119 "{\n"
 120 "   vec3 vcolour = g_light_colours[0].rgb;\n"
 121 "   vec3 vdir = g_light_directions[0].xyz;\n"
 122 "\n"
 123 "   vec3 specdir = reflect( -vdir, wnormal );\n"
 124 "   float spec = pow(max(dot( halfview, specdir ), 0.0), 10.0);\n"
 125 "   return vfrag + vcolour*spec*fintensity;\n"
 126 "}\n"
 127 "\n"
 128 "float world_depth_sample( vec3 pos )\n"
 129 "{\n"
 130 "   vec2 depth_coord = (pos.xz - g_depth_bounds.xy) * g_depth_bounds.zw; \n"
 131 "   return texture( g_world_depth, depth_coord ).r;\n"
 132 "}\n"
 133 "\n"
 134 "float shadow_sample( vec3 vdir )\n"
 135 "{\n"
 136 "   vec3 sample_pos = aWorldCo + vdir;\n"
 137 "   float height_sample = world_depth_sample( sample_pos );\n"
 138 "\n"
 139 "   float fdelta = height_sample - sample_pos.y;\n"
 140 "   return clamp( fdelta, 0.1, 0.2 )-0.1;\n"
 141 "}\n"
 142 "\n"
 143 "vec3 do_light_shadowing_old( vec3 vfrag )\n"
 144 "{\n"
 145 "   float faccum = 0.0;\n"
 146 "   faccum += shadow_sample( vec3( 0.0, 0.5, 0.0 ));\n"
 147 "   faccum += shadow_sample( vec3( 2.0, 0.3, 0.0 ));\n"
 148 "   faccum += shadow_sample( vec3( 3.0, 1.0, 0.0 ));\n"
 149 "   faccum += shadow_sample( vec3( 5.0, 1.0, 0.0 ));\n"
 150 "   faccum += shadow_sample( vec3( 0.0, 0.5, 0.0 )*1.5);\n"
 151 "   faccum += shadow_sample( vec3( 2.0, 0.3, 0.0 )*1.5);\n"
 152 "   faccum += shadow_sample( vec3( 3.0, 1.0, 0.0 )*1.5);\n"
 153 "   faccum += shadow_sample( vec3( 5.0, 1.0, 0.0 )*1.5);\n"
 154 "   return mix( vfrag, g_ambient_colour.rgb, faccum );\n"
 155 "}\n"
 156 "\n"
 157 "// FIXME\n"
 158 "float sdLine( vec3 p, vec3 a, vec3 b )\n"
 159 "{\n"
 160 "  vec3 pa = p - a;\n"
 161 "  vec3 ba = b - a;\n"
 162 "\n"
 163 "  float h = clamp( dot(pa,ba)/dot(ba,ba), 0.0, 1.0 );\n"
 164 "  return length( pa - ba*h );\n"
 165 "}\n"
 166 "\n"
 167 "vec3 do_light_shadowing( vec3 vfrag )\n"
 168 "{\n"
 169 "   if( g_shadow_samples == 0 )\n"
 170 "   {\n"
 171 "      return vfrag;\n"
 172 "   }\n"
 173 "\n"
 174 "   float fspread = g_light_colours[0].w;\n"
 175 "   vec3  vdir = g_light_directions[0].xyz;\n"
 176 "   float flength = g_light_directions[0].w;\n"
 177 "\n"
 178 "   float famt = 0.0;\n"
 179 "   famt+=shadow_sample((vdir+vec3(-0.563, 0.550, 0.307)*fspread)*flength*0.1);\n"
 180 "   famt+=shadow_sample((vdir+vec3( 0.808, 0.686, 0.346)*fspread)*flength*0.2);\n"
 181 "   famt+=shadow_sample((vdir+vec3( 0.787, 0.074,-0.065)*fspread)*flength*0.3);\n"
 182 "   famt+=shadow_sample((vdir+vec3(-0.593, 0.071,-0.425)*fspread)*flength*0.4);\n"
 183 "   famt+=shadow_sample((vdir+vec3(-0.790,-0.933,-0.875)*fspread)*flength*0.5);\n"
 184 "   famt+=shadow_sample((vdir+vec3( 0.807,-0.690, 0.472)*fspread)*flength*0.6);\n"
 185 "   famt+=shadow_sample((vdir+vec3( 0.522,-0.379, 0.350)*fspread)*flength*0.7);\n"
 186 "   famt+=shadow_sample((vdir+vec3( 0.483, 0.201, 0.306)*fspread)*flength*0.8);\n"
 187 "\n"
 188 "   // player shadow\n"
 189 "   float dist_to_player = max( 0.0, sdLine( aWorldCo, uBoard0, uBoard1 )-0.03 );\n"
 190 "   float player_shadow = max( 1.0-dist_to_player*1.7, 0.0 );\n"
 191 "   player_shadow *= player_shadow*player_shadow*player_shadow;\n"
 192 "\n"
 193 "   famt = max( player_shadow*0.6, famt );\n"
 194 "   return mix( vfrag, g_ambient_colour.rgb, famt );\n"
 195 "}\n"
 196 "\n"
 197 "vec3 apply_fog( vec3 vfrag, float fdist )\n"
 198 "{\n"
 199 "   float dist = pow(fdist*0.0008,1.2);\n"
 200 "   return mix( vfrag, vec3(0.55,0.76,1.0), min( 1.0, dist ) );\n"
 201 "}\n"
 202 "\n"
 203 "#line     14        0 \n"
 204 "\n"
 205 "// Water blending\n"
 206 "// ==============\n"
 207 "\n"
 208 "float water_depth( vec3 pos, vec3 halfview )\n"
 209 "{\n"
 210 "   vec3 pnorm = g_water_plane.xyz;\n"
 211 "   float pdist = g_water_plane.w;\n"
 212 "\n"
 213 "   float d = dot( pnorm, halfview );\n"
 214 "   float t = dot((pnorm*pdist - pos), pnorm) / d;\n"
 215 "   return t * g_water_fog;\n"
 216 "}\n"
 217 "\n"
 218 "void main()\n"
 219 "{\n"
 220 "   vec3 halfview = normalize( uCamera - aCo );\n"
 221 "   vec3 world_pos = vec3( aCo.y, aCo.x, aCo.z );\n"
 222 "   FragColor = vec4( world_pos, water_depth( aCo, halfview ) );\n"
 223 "}\n"
 224 ""},
 225 };
 226
 227 static GLuint _uniform_gpos_uMdl;
 228 static GLuint _uniform_gpos_uPv;
 229 static GLuint _uniform_gpos_uPvmPrev;
 230 static GLuint _uniform_gpos_uCamera;
 231 static GLuint _uniform_gpos_uBoard0;
 232 static GLuint _uniform_gpos_uBoard1;
 233 static GLuint _uniform_gpos_g_world_depth;
 234 static void shader_gpos_uMdl(m4x3f m){
 235    glUniformMatrix4x3fv(_uniform_gpos_uMdl,1,GL_FALSE,(float*)m);
 236 }
 237 static void shader_gpos_uPv(m4x4f m){
 238    glUniformMatrix4fv(_uniform_gpos_uPv,1,GL_FALSE,(float*)m);
 239 }
 240 static void shader_gpos_uPvmPrev(m4x4f m){
 241    glUniformMatrix4fv(_uniform_gpos_uPvmPrev,1,GL_FALSE,(float*)m);
 242 }
 243 static void shader_gpos_uCamera(v3f v){
 244    glUniform3fv(_uniform_gpos_uCamera,1,v);
 245 }
 246 static void shader_gpos_uBoard0(v3f v){
 247    glUniform3fv(_uniform_gpos_uBoard0,1,v);
 248 }
 249 static void shader_gpos_uBoard1(v3f v){
 250    glUniform3fv(_uniform_gpos_uBoard1,1,v);
 251 }
 252 static void shader_gpos_g_world_depth(int i){
 253    glUniform1i(_uniform_gpos_g_world_depth,i);
 254 }
 255 static void shader_gpos_register(void){
 256    vg_shader_register( &_shader_gpos );
 257 }
 258 static void shader_gpos_use(void){ glUseProgram(_shader_gpos.id); }
 259 static void shader_gpos_link(void){
 260    _uniform_gpos_uMdl = glGetUniformLocation( _shader_gpos.id, "uMdl" );
 261    _uniform_gpos_uPv = glGetUniformLocation( _shader_gpos.id, "uPv" );
 262    _uniform_gpos_uPvmPrev = glGetUniformLocation( _shader_gpos.id, "uPvmPrev" );
 263    _uniform_gpos_uCamera = glGetUniformLocation( _shader_gpos.id, "uCamera" );
 264    _uniform_gpos_uBoard0 = glGetUniformLocation( _shader_gpos.id, "uBoard0" );
 265    _uniform_gpos_uBoard1 = glGetUniformLocation( _shader_gpos.id, "uBoard1" );
 266    _uniform_gpos_g_world_depth = glGetUniformLocation( _shader_gpos.id, "g_world_depth" );
 267 }
 268 #endif /* SHADER_gpos_H */