shaders/terrain.h

   1 #ifndef SHADER_terrain_H
   2 #define SHADER_terrain_H
   3 static void shader_terrain_link(void);
   4 static void shader_terrain_register(void);
   5 static struct vg_shader _shader_terrain = {
   6    .name = "terrain",
   7    .link = shader_terrain_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 "uniform sampler2D uTexGarbage;\n"
  69 "uniform sampler2D uTexGradients;\n"
  70 "uniform vec3 uCamera;\n"
  71 "uniform vec3 uSandColour;\n"
  72 "uniform vec2 uBlendOffset;\n"
  73 "uniform vec3 uBoard0;\n"
  74 "uniform vec3 uBoard1;\n"
  75 "\n"
  76 "in vec4 aColour;\n"
  77 "in vec2 aUv;\n"
  78 "in vec3 aNorm;\n"
  79 "in vec3 aCo;\n"
  80 "in vec3 aWorldCo;\n"
  81 "\n"
  82 "#line       1        1 \n"
  83 "layout (location = 0) out vec4 oColour;\n"
  84 "\n"
  85 "layout (std140) uniform ub_world_lighting\n"
  86 "{\n"
  87 "   vec4 g_light_colours[3];\n"
  88 "   vec4 g_light_directions[3];\n"
  89 "   vec4 g_ambient_colour;\n"
  90 "\n"
  91 "   vec4 g_water_plane;\n"
  92 "   vec4 g_depth_bounds;\n"
  93 "   float g_water_fog;\n"
  94 "   int g_light_count;\n"
  95 "   int g_light_preview;\n"
  96 "   int g_shadow_samples;\n"
  97 "};\n"
  98 "\n"
  99 "uniform sampler2D g_world_depth;\n"
 100 "\n"
 101 "// Standard diffuse + spec models\n"
 102 "// ==============================\n"
 103 "\n"
 104 "vec3 do_light_diffuse( vec3 vfrag, vec3 wnormal )\n"
 105 "{\n"
 106 "   vec3 vtotal = g_ambient_colour.rgb;\n"
 107 "\n"
 108 "   for( int i=0; i<g_light_count; i++ )\n"
 109 "   {\n"
 110 "      vec3 vcolour = g_light_colours[i].rgb;\n"
 111 "      vec3 vdir = g_light_directions[i].xyz;\n"
 112 "\n"
 113 "      float flight = max(dot( vdir, wnormal )*0.75+0.25,0.0);\n"
 114 "      vtotal += vcolour*flight;\n"
 115 "   }\n"
 116 "\n"
 117 "   return vfrag * vtotal;\n"
 118 "}\n"
 119 "\n"
 120 "vec3 do_light_spec( vec3 vfrag, vec3 wnormal, vec3 halfview, float fintensity )\n"
 121 "{\n"
 122 "   vec3 vcolour = g_light_colours[0].rgb;\n"
 123 "   vec3 vdir = g_light_directions[0].xyz;\n"
 124 "\n"
 125 "   vec3 specdir = reflect( -vdir, wnormal );\n"
 126 "   float spec = pow(max(dot( halfview, specdir ), 0.0), 10.0);\n"
 127 "   return vfrag + vcolour*spec*fintensity;\n"
 128 "}\n"
 129 "\n"
 130 "float world_depth_sample( vec3 pos )\n"
 131 "{\n"
 132 "   vec2 depth_coord = (pos.xz - g_depth_bounds.xy) * g_depth_bounds.zw; \n"
 133 "   return texture( g_world_depth, depth_coord ).r;\n"
 134 "}\n"
 135 "\n"
 136 "float shadow_sample( vec3 vdir )\n"
 137 "{\n"
 138 "   vec3 sample_pos = aWorldCo + vdir;\n"
 139 "   float height_sample = world_depth_sample( sample_pos );\n"
 140 "\n"
 141 "   float fdelta = height_sample - sample_pos.y;\n"
 142 "   return clamp( fdelta, 0.1, 0.2 )-0.1;\n"
 143 "}\n"
 144 "\n"
 145 "vec3 do_light_shadowing_old( vec3 vfrag )\n"
 146 "{\n"
 147 "   float faccum = 0.0;\n"
 148 "   faccum += shadow_sample( vec3( 0.0, 0.5, 0.0 ));\n"
 149 "   faccum += shadow_sample( vec3( 2.0, 0.3, 0.0 ));\n"
 150 "   faccum += shadow_sample( vec3( 3.0, 1.0, 0.0 ));\n"
 151 "   faccum += shadow_sample( vec3( 5.0, 1.0, 0.0 ));\n"
 152 "   faccum += shadow_sample( vec3( 0.0, 0.5, 0.0 )*1.5);\n"
 153 "   faccum += shadow_sample( vec3( 2.0, 0.3, 0.0 )*1.5);\n"
 154 "   faccum += shadow_sample( vec3( 3.0, 1.0, 0.0 )*1.5);\n"
 155 "   faccum += shadow_sample( vec3( 5.0, 1.0, 0.0 )*1.5);\n"
 156 "   return mix( vfrag, g_ambient_colour.rgb, faccum );\n"
 157 "}\n"
 158 "\n"
 159 "float sdLine( vec3 p, vec3 a, vec3 b )\n"
 160 "{\n"
 161 "  vec3 pa = p - a;\n"
 162 "  vec3 ba = b - a;\n"
 163 "\n"
 164 "  float h = clamp( dot(pa,ba)/dot(ba,ba), 0.0, 1.0 );\n"
 165 "  return length( pa - ba*h );\n"
 166 "}\n"
 167 "\n"
 168 "vec3 do_light_shadowing( vec3 vfrag )\n"
 169 "{\n"
 170 "   if( g_shadow_samples == 0 )\n"
 171 "   {\n"
 172 "      return vfrag;\n"
 173 "   }\n"
 174 "\n"
 175 "   float fspread = g_light_colours[0].w;\n"
 176 "   vec3  vdir = g_light_directions[0].xyz;\n"
 177 "   float flength = g_light_directions[0].w;\n"
 178 "\n"
 179 "   float famt = 0.0;\n"
 180 "   famt+=shadow_sample((vdir+vec3(-0.563, 0.550, 0.307)*fspread)*flength*0.1);\n"
 181 "   famt+=shadow_sample((vdir+vec3( 0.808, 0.686, 0.346)*fspread)*flength*0.2);\n"
 182 "   famt+=shadow_sample((vdir+vec3( 0.787, 0.074,-0.065)*fspread)*flength*0.3);\n"
 183 "   famt+=shadow_sample((vdir+vec3(-0.593, 0.071,-0.425)*fspread)*flength*0.4);\n"
 184 "   famt+=shadow_sample((vdir+vec3(-0.790,-0.933,-0.875)*fspread)*flength*0.5);\n"
 185 "   famt+=shadow_sample((vdir+vec3( 0.807,-0.690, 0.472)*fspread)*flength*0.6);\n"
 186 "   famt+=shadow_sample((vdir+vec3( 0.522,-0.379, 0.350)*fspread)*flength*0.7);\n"
 187 "   famt+=shadow_sample((vdir+vec3( 0.483, 0.201, 0.306)*fspread)*flength*0.8);\n"
 188 "\n"
 189 "   // player shadow\n"
 190 "   float dist_to_player = max( 0.0, sdLine( aWorldCo, uBoard0, uBoard1 )-0.1 );\n"
 191 "   float player_shadow = max( 1.0-dist_to_player*2.7, 0.0 );\n"
 192 "   player_shadow *= player_shadow*player_shadow*player_shadow;\n"
 193 "\n"
 194 "   famt = max( player_shadow*0.8, famt );\n"
 195 "   return mix( vfrag, g_ambient_colour.rgb, famt );\n"
 196 "}\n"
 197 "\n"
 198 "vec3 apply_fog( vec3 vfrag, float fdist )\n"
 199 "{\n"
 200 "   float dist = pow(fdist*0.0008,1.2);\n"
 201 "   return mix( vfrag, vec3(0.55,0.76,1.0), min( 1.0, dist ) );\n"
 202 "}\n"
 203 "\n"
 204 "#line     16        0 \n"
 205 "#line       1        2 \n"
 206 "const float k_motion_lerp_amount = 0.01;\n"
 207 "\n"
 208 "#line      2        0 \n"
 209 "\n"
 210 "layout (location = 1) out vec2 oMotionVec;\n"
 211 "\n"
 212 "in vec3 aMotionVec0;\n"
 213 "in vec3 aMotionVec1;\n"
 214 "\n"
 215 "void compute_motion_vectors()\n"
 216 "{\n"
 217 "   // Write motion vectors\n"
 218 "   vec2 vmotion0 = aMotionVec0.xy / aMotionVec0.z;\n"
 219 "   vec2 vmotion1 = aMotionVec1.xy / aMotionVec1.z;\n"
 220 "\n"
 221 "   oMotionVec = (vmotion1-vmotion0) * (1.0/k_motion_lerp_amount);\n"
 222 "}\n"
 223 "\n"
 224 "#line     17        0 \n"
 225 "\n"
 226 "void main()\n"
 227 "{\n"
 228 "   compute_motion_vectors();\n"
 229 "\n"
 230 "   // Colour\n"
 231 "   // ------\n"
 232 "   vec3 vfrag = vec3(0.5,0.5,0.5);\n"
 233 "\n"
 234 "   // ws modulation\n"
 235 "   vec4 wgarbage = texture( uTexGarbage, aCo.xz * 0.015 );\n"
 236 "   \n"
 237 "   // Creating normal patches\n"
 238 "   vec3 modnorm = (wgarbage.rgb-0.4) * 1.4;\n"
 239 "   vec3 qnorm = normalize(floor(aNorm*4.0+modnorm)*0.25) + vec3(0.001,0.0,0.0);\n"
 240 "   vec2 dir = normalize(qnorm.xz);\n"
 241 "   vec2 uvdiffuse = aCo.xz * 0.02;\n"
 242 "   uvdiffuse = mat2(dir.y, dir.x, -dir.x, dir.y) * uvdiffuse;\n"
 243 "   \n"
 244 "   // Patch local noise\n"
 245 "   vec4 rgarbage = texture( uTexGarbage, uvdiffuse );\n"
 246 "\n"
 247 "   // Colour blending\n"
 248 "   float amtgrass = step(qnorm.y,0.6);\n"
 249 "   float amtsand = min(max((aCo.y - 10.0) * -0.1,0.0)*qnorm.y,1.0);\n"
 250 "   vec2 uvgradients = aUv + vec2( amtgrass + rgarbage.a*0.8 )*uBlendOffset;\n"
 251 "   vfrag = texture( uTexGradients, uvgradients ).rgb;\n"
 252 "   vfrag = mix( vfrag, uSandColour, amtsand );\n"
 253 "\n"
 254 "   qnorm = mix( qnorm, aNorm, amtsand );\n"
 255 "   \n"
 256 "   if( g_light_preview == 1 )\n"
 257 "   {\n"
 258 "      vfrag = vec3(0.5);\n"
 259 "   }\n"
 260 "\n"
 261 "   // Lighting\n"
 262 "   vec3 halfview = uCamera - aCo;\n"
 263 "   float fdist = length( halfview );\n"
 264 "   halfview /= fdist;\n"
 265 "\n"
 266 "   vfrag = do_light_diffuse( vfrag, qnorm );\n"
 267 "   vfrag = do_light_spec( vfrag, qnorm, halfview, 0.1 );\n"
 268 "   vfrag = do_light_shadowing( vfrag );\n"
 269 "   vfrag = apply_fog( vfrag, fdist );\n"
 270 "\n"
 271 "   oColour = vec4(vfrag, 1.0 );\n"
 272 "}\n"
 273 ""},
 274 };
 275
 276 static GLuint _uniform_terrain_uMdl;
 277 static GLuint _uniform_terrain_uPv;
 278 static GLuint _uniform_terrain_uPvmPrev;
 279 static GLuint _uniform_terrain_uTexGarbage;
 280 static GLuint _uniform_terrain_uTexGradients;
 281 static GLuint _uniform_terrain_uCamera;
 282 static GLuint _uniform_terrain_uSandColour;
 283 static GLuint _uniform_terrain_uBlendOffset;
 284 static GLuint _uniform_terrain_uBoard0;
 285 static GLuint _uniform_terrain_uBoard1;
 286 static GLuint _uniform_terrain_g_world_depth;
 287 static void shader_terrain_uMdl(m4x3f m){
 288    glUniformMatrix4x3fv(_uniform_terrain_uMdl,1,GL_FALSE,(float*)m);
 289 }
 290 static void shader_terrain_uPv(m4x4f m){
 291    glUniformMatrix4fv(_uniform_terrain_uPv,1,GL_FALSE,(float*)m);
 292 }
 293 static void shader_terrain_uPvmPrev(m4x4f m){
 294    glUniformMatrix4fv(_uniform_terrain_uPvmPrev,1,GL_FALSE,(float*)m);
 295 }
 296 static void shader_terrain_uTexGarbage(int i){
 297    glUniform1i(_uniform_terrain_uTexGarbage,i);
 298 }
 299 static void shader_terrain_uTexGradients(int i){
 300    glUniform1i(_uniform_terrain_uTexGradients,i);
 301 }
 302 static void shader_terrain_uCamera(v3f v){
 303    glUniform3fv(_uniform_terrain_uCamera,1,v);
 304 }
 305 static void shader_terrain_uSandColour(v3f v){
 306    glUniform3fv(_uniform_terrain_uSandColour,1,v);
 307 }
 308 static void shader_terrain_uBlendOffset(v2f v){
 309    glUniform2fv(_uniform_terrain_uBlendOffset,1,v);
 310 }
 311 static void shader_terrain_uBoard0(v3f v){
 312    glUniform3fv(_uniform_terrain_uBoard0,1,v);
 313 }
 314 static void shader_terrain_uBoard1(v3f v){
 315    glUniform3fv(_uniform_terrain_uBoard1,1,v);
 316 }
 317 static void shader_terrain_g_world_depth(int i){
 318    glUniform1i(_uniform_terrain_g_world_depth,i);
 319 }
 320 static void shader_terrain_register(void){
 321    vg_shader_register( &_shader_terrain );
 322 }
 323 static void shader_terrain_use(void){ glUseProgram(_shader_terrain.id); }
 324 static void shader_terrain_link(void){
 325    _uniform_terrain_uMdl = glGetUniformLocation( _shader_terrain.id, "uMdl" );
 326    _uniform_terrain_uPv = glGetUniformLocation( _shader_terrain.id, "uPv" );
 327    _uniform_terrain_uPvmPrev = glGetUniformLocation( _shader_terrain.id, "uPvmPrev" );
 328    _uniform_terrain_uTexGarbage = glGetUniformLocation( _shader_terrain.id, "uTexGarbage" );
 329    _uniform_terrain_uTexGradients = glGetUniformLocation( _shader_terrain.id, "uTexGradients" );
 330    _uniform_terrain_uCamera = glGetUniformLocation( _shader_terrain.id, "uCamera" );
 331    _uniform_terrain_uSandColour = glGetUniformLocation( _shader_terrain.id, "uSandColour" );
 332    _uniform_terrain_uBlendOffset = glGetUniformLocation( _shader_terrain.id, "uBlendOffset" );
 333    _uniform_terrain_uBoard0 = glGetUniformLocation( _shader_terrain.id, "uBoard0" );
 334    _uniform_terrain_uBoard1 = glGetUniformLocation( _shader_terrain.id, "uBoard1" );
 335    _uniform_terrain_g_world_depth = glGetUniformLocation( _shader_terrain.id, "g_world_depth" );
 336 }
 337 #endif /* SHADER_terrain_H */