shaders/scene_depth.h

   1 #ifndef SHADER_scene_depth_H
   2 #define SHADER_scene_depth_H
   3 static void shader_scene_depth_link(void);
   4 static void shader_scene_depth_register(void);
   5 static struct vg_shader _shader_scene_depth = {
   6    .name = "scene_depth",
   7    .link = shader_scene_depth_link,
   8    .vs =
   9 {
  10 .static_src =
  11 "layout (location=0) in vec3  a_co;\n"
  12 "layout (location=1) in vec4  a_norm;\n"
  13 "layout (location=2) in vec2  a_uv;\n"
  14 "layout (location=3) in ivec4 a_lights;\n"
  15 "\n"
  16 "#line       1        1 \n"
  17 "const float k_motion_lerp_amount = 0.01;\n"
  18 "\n"
  19 "#line      2        0 \n"
  20 "\n"
  21 "out vec3 aMotionVec0;\n"
  22 "out vec3 aMotionVec1;\n"
  23 "\n"
  24 "void vs_motion_out( vec4 vproj0, vec4 vproj1 )\n"
  25 "{\n"
  26 "   // This magically solves some artifacting errors!\n"
  27 "   //\n"
  28 "   vproj1 = vproj0*(1.0-k_motion_lerp_amount) + vproj1*k_motion_lerp_amount;\n"
  29 "\n"
  30 "   aMotionVec0 = vec3( vproj0.xy, vproj0.w );\n"
  31 "   aMotionVec1 = vec3( vproj1.xy, vproj1.w );\n"
  32 "}\n"
  33 "\n"
  34 "#line      7        0 \n"
  35 "\n"
  36 "uniform mat4x3 uMdl;\n"
  37 "uniform mat4   uPv;\n"
  38 "uniform mat4   uPvmPrev;\n"
  39 "\n"
  40 "out vec2 aUv;\n"
  41 "out vec4 aNorm;\n"
  42 "out vec3 aCo;\n"
  43 "out vec3 aWorldCo;\n"
  44 "flat out ivec4 aLights;\n"
  45 "\n"
  46 "void main()\n"
  47 "{\n"
  48 "   vec3 world_pos0 = uMdl     * vec4( a_co, 1.0 );\n"
  49 "   vec4 vproj0     = uPv      * vec4( world_pos0, 1.0 );\n"
  50 "   vec4 vproj1     = uPvmPrev * vec4( a_co, 1.0 );\n"
  51 "\n"
  52 "   vs_motion_out( vproj0, vproj1 );\n"
  53 "\n"
  54 "   gl_Position = vproj0;\n"
  55 "\n"
  56 "   aUv = a_uv;\n"
  57 "   aNorm = vec4( mat3(uMdl) * a_norm.xyz, a_norm.w );\n"
  58 "   aCo = a_co;\n"
  59 "   aWorldCo = world_pos0;\n"
  60 "   aLights = a_lights;\n"
  61 "}\n"
  62 ""},
  63    .fs =
  64 {
  65 .static_src =
  66 "out vec4 FragColor;\n"
  67 "\n"
  68 "uniform vec3 uCamera;\n"
  69 "uniform vec3 uBoard0;\n"
  70 "uniform vec3 uBoard1;\n"
  71 "\n"
  72 "in vec2 aUv;\n"
  73 "in vec4 aNorm;\n"
  74 "in vec3 aCo;\n"
  75 "in vec3 aWorldCo;\n"
  76 "flat in ivec4 aLights;\n"
  77 "\n"
  78 "#line       1        1 \n"
  79 "layout (location = 0) out vec4 oColour;\n"
  80 "\n"
  81 "layout (std140) uniform ub_world_lighting\n"
  82 "{\n"
  83 "   vec4 g_light_colours[3];\n"
  84 "   vec4 g_light_directions[3];\n"
  85 "   vec4 g_ambient_colour;\n"
  86 "\n"
  87 "   vec4 g_water_plane;\n"
  88 "   vec4 g_depth_bounds;\n"
  89 "   float g_water_fog;\n"
  90 "   int g_light_count;\n"
  91 "   int g_light_preview;\n"
  92 "   int g_shadow_samples;\n"
  93 "\n"
  94 "   vec4 g_point_light_positions[32];\n"
  95 "   vec4 g_point_light_colours[32];\n"
  96 "};\n"
  97 "\n"
  98 "uniform sampler2D g_world_depth;\n"
  99 "\n"
 100 "float world_depth_sample( vec3 pos )\n"
 101 "{\n"
 102 "   vec2 depth_coord = (pos.xz - g_depth_bounds.xy) * g_depth_bounds.zw; \n"
 103 "   return texture( g_world_depth, depth_coord ).r;\n"
 104 "}\n"
 105 "\n"
 106 "float shadow_sample( vec3 vdir )\n"
 107 "{\n"
 108 "   vec3 sample_pos = aWorldCo + vdir;\n"
 109 "   float height_sample = world_depth_sample( sample_pos );\n"
 110 "\n"
 111 "   float fdelta = height_sample - sample_pos.y;\n"
 112 "   return clamp( fdelta, 0.1, 0.2 )-0.1;\n"
 113 "}\n"
 114 "\n"
 115 "float sdLine( vec3 p, vec3 a, vec3 b )\n"
 116 "{\n"
 117 "  vec3 pa = p - a;\n"
 118 "  vec3 ba = b - a;\n"
 119 "\n"
 120 "  float h = clamp( dot(pa,ba)/dot(ba,ba), 0.0, 1.0 );\n"
 121 "  return length( pa - ba*h );\n"
 122 "}\n"
 123 "\n"
 124 "vec3 apply_fog( vec3 vfrag, float fdist )\n"
 125 "{\n"
 126 "   float dist = pow(fdist*0.0008,1.2);\n"
 127 "   return mix( vfrag, vec3(0.55,0.76,1.0), min( 1.0, dist ) );\n"
 128 "}\n"
 129 "\n"
 130 "\n"
 131 "// New lighting model\n"
 132 "\n"
 133 "vec3 newlight_compute_ambient()\n"
 134 "{\n"
 135 "   return g_ambient_colour.rgb;\n"
 136 "}\n"
 137 "\n"
 138 "float newlight_compute_sun_shadow()\n"
 139 "{\n"
 140 "   if( g_shadow_samples == 0 )\n"
 141 "   {\n"
 142 "      return 1.0;\n"
 143 "   }\n"
 144 "\n"
 145 "   float fspread = g_light_colours[0].w;\n"
 146 "   vec3  vdir = g_light_directions[0].xyz;\n"
 147 "   float flength = g_light_directions[0].w;\n"
 148 "\n"
 149 "   float famt = 0.0;\n"
 150 "   famt+=shadow_sample((vdir+vec3(-0.563, 0.550, 0.307)*fspread)*flength*0.1);\n"
 151 "   famt+=shadow_sample((vdir+vec3( 0.808, 0.686, 0.346)*fspread)*flength*0.2);\n"
 152 "   famt+=shadow_sample((vdir+vec3( 0.787, 0.074,-0.065)*fspread)*flength*0.3);\n"
 153 "   famt+=shadow_sample((vdir+vec3(-0.593, 0.071,-0.425)*fspread)*flength*0.4);\n"
 154 "   famt+=shadow_sample((vdir+vec3(-0.790,-0.933,-0.875)*fspread)*flength*0.5);\n"
 155 "   famt+=shadow_sample((vdir+vec3( 0.807,-0.690, 0.472)*fspread)*flength*0.6);\n"
 156 "   famt+=shadow_sample((vdir+vec3( 0.522,-0.379, 0.350)*fspread)*flength*0.7);\n"
 157 "   famt+=shadow_sample((vdir+vec3( 0.483, 0.201, 0.306)*fspread)*flength*0.8);\n"
 158 "\n"
 159 "   // player shadow\n"
 160 "   float dist_to_player = max( 0.0, sdLine( aWorldCo, uBoard0, uBoard1 )-0.1 );\n"
 161 "   float player_shadow = max( 1.0-dist_to_player*2.7, 0.0 );\n"
 162 "   player_shadow *= player_shadow*player_shadow*player_shadow;\n"
 163 "\n"
 164 "   return 1.0 - max( player_shadow*0.8, famt );\n"
 165 "}\n"
 166 "\n"
 167 "vec3 newlight_compute_world_diffuse( vec3 wnormal )\n"
 168 "{\n"
 169 "   vec3 vtotal = g_ambient_colour.rgb;\n"
 170 "\n"
 171 "   for( int i=0; i<g_light_count; i++ )\n"
 172 "   {\n"
 173 "      vec3 vcolour = g_light_colours[i].rgb;\n"
 174 "      vec3 vdir = g_light_directions[i].xyz;\n"
 175 "\n"
 176 "      float flight = max(dot( vdir, wnormal )*0.75+0.25,0.0);\n"
 177 "      vtotal += vcolour*flight;\n"
 178 "   }\n"
 179 "\n"
 180 "   return vtotal;\n"
 181 "}\n"
 182 "\n"
 183 "vec3 newlight_compute_sun_spec( vec3 wnormal, vec3 halfview, float fintensity )\n"
 184 "{\n"
 185 "   vec3 vcolour = g_light_colours[0].rgb;\n"
 186 "   vec3 vdir = g_light_directions[0].xyz;\n"
 187 "\n"
 188 "   vec3 specdir = reflect( -vdir, wnormal );\n"
 189 "   float spec = pow(max(dot( halfview, specdir ), 0.0), 10.0);\n"
 190 "   return vcolour*spec*fintensity;\n"
 191 "}\n"
 192 "\n"
 193 "vec3 newlight_compute_quadratic( vec3 wnormal, vec3 halfview, \n"
 194 "                                 vec3 light_pos, vec3 light_colour )\n"
 195 "{\n"
 196 "   vec3 light_delta = (light_pos-aWorldCo) * 10.0;\n"
 197 "\n"
 198 "   float quadratic = dot(light_delta,light_delta);\n"
 199 "   float attenuation = 1.0f/( 1.0f + quadratic );\n"
 200 "   attenuation *= max( 0.0, dot( normalize(light_delta), wnormal ) );\n"
 201 "\n"
 202 "   return light_colour*attenuation;\n"
 203 "}\n"
 204 "\n"
 205 "#line     14        0 \n"
 206 "\n"
 207 "// Water blending\n"
 208 "// ==============\n"
 209 "\n"
 210 "float water_depth( vec3 pos, vec3 halfview )\n"
 211 "{\n"
 212 "   vec3 pnorm = g_water_plane.xyz;\n"
 213 "   float pdist = g_water_plane.w;\n"
 214 "\n"
 215 "   float d = dot( pnorm, halfview );\n"
 216 "   float t = dot((pnorm*pdist - pos), pnorm) / d;\n"
 217 "   return t * g_water_fog;\n"
 218 "}\n"
 219 "\n"
 220 "void main()\n"
 221 "{\n"
 222 "   vec3 halfview = normalize( uCamera - aCo );\n"
 223 "   vec3 world_pos = vec3( aCo.y, aCo.x, aCo.z );\n"
 224 "   FragColor = vec4( world_pos, water_depth( aCo, halfview ) );\n"
 225 "}\n"
 226 ""},
 227 };
 228
 229 static GLuint _uniform_scene_depth_uMdl;
 230 static GLuint _uniform_scene_depth_uPv;
 231 static GLuint _uniform_scene_depth_uPvmPrev;
 232 static GLuint _uniform_scene_depth_uCamera;
 233 static GLuint _uniform_scene_depth_uBoard0;
 234 static GLuint _uniform_scene_depth_uBoard1;
 235 static GLuint _uniform_scene_depth_g_world_depth;
 236 static void shader_scene_depth_uMdl(m4x3f m){
 237    glUniformMatrix4x3fv(_uniform_scene_depth_uMdl,1,GL_FALSE,(float*)m);
 238 }
 239 static void shader_scene_depth_uPv(m4x4f m){
 240    glUniformMatrix4fv(_uniform_scene_depth_uPv,1,GL_FALSE,(float*)m);
 241 }
 242 static void shader_scene_depth_uPvmPrev(m4x4f m){
 243    glUniformMatrix4fv(_uniform_scene_depth_uPvmPrev,1,GL_FALSE,(float*)m);
 244 }
 245 static void shader_scene_depth_uCamera(v3f v){
 246    glUniform3fv(_uniform_scene_depth_uCamera,1,v);
 247 }
 248 static void shader_scene_depth_uBoard0(v3f v){
 249    glUniform3fv(_uniform_scene_depth_uBoard0,1,v);
 250 }
 251 static void shader_scene_depth_uBoard1(v3f v){
 252    glUniform3fv(_uniform_scene_depth_uBoard1,1,v);
 253 }
 254 static void shader_scene_depth_g_world_depth(int i){
 255    glUniform1i(_uniform_scene_depth_g_world_depth,i);
 256 }
 257 static void shader_scene_depth_register(void){
 258    vg_shader_register( &_shader_scene_depth );
 259 }
 260 static void shader_scene_depth_use(void){ glUseProgram(_shader_scene_depth.id); }
 261 static void shader_scene_depth_link(void){
 262    _uniform_scene_depth_uMdl = glGetUniformLocation( _shader_scene_depth.id, "uMdl" );
 263    _uniform_scene_depth_uPv = glGetUniformLocation( _shader_scene_depth.id, "uPv" );
 264    _uniform_scene_depth_uPvmPrev = glGetUniformLocation( _shader_scene_depth.id, "uPvmPrev" );
 265    _uniform_scene_depth_uCamera = glGetUniformLocation( _shader_scene_depth.id, "uCamera" );
 266    _uniform_scene_depth_uBoard0 = glGetUniformLocation( _shader_scene_depth.id, "uBoard0" );
 267    _uniform_scene_depth_uBoard1 = glGetUniformLocation( _shader_scene_depth.id, "uBoard1" );
 268    _uniform_scene_depth_g_world_depth = glGetUniformLocation( _shader_scene_depth.id, "g_world_depth" );
 269 }
 270 #endif /* SHADER_scene_depth_H */