shaders/viewchar.h

   1 #ifndef SHADER_viewchar_H
   2 #define SHADER_viewchar_H
   3 static void shader_viewchar_link(void);
   4 static void shader_viewchar_register(void);
   5 static struct vg_shader _shader_viewchar = {
   6    .name = "viewchar",
   7    .link = shader_viewchar_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 mat4 uPv;\n"
  40 "\n"
  41 "// TODO: Send a previous transform matrix stack\n"
  42 "//\n"
  43 "uniform mat4x3 uTransforms[32];\n"
  44 "\n"
  45 "out vec4 aColour;\n"
  46 "out vec2 aUv;\n"
  47 "out vec3 aNorm;\n"
  48 "out vec3 aCo;\n"
  49 "out vec3 aWorldCo;\n"
  50 "\n"
  51 "void main()\n"
  52 "{\n"
  53 "   vec4 co_local = vec4( a_co, 1.0 );\n"
  54 "   vec3 co0 = uTransforms[ a_groups[0] ] * co_local;\n"
  55 "   vec3 co1 = uTransforms[ a_groups[1] ] * co_local;\n"
  56 "   vec3 co2 = uTransforms[ a_groups[2] ] * co_local;\n"
  57 "   vec3 n0  = mat3(uTransforms[ a_groups[0] ]) * a_norm;\n"
  58 "   vec3 n1  = mat3(uTransforms[ a_groups[1] ]) * a_norm;\n"
  59 "   vec3 n2  = mat3(uTransforms[ a_groups[2] ]) * a_norm;\n"
  60 "\n"
  61 "   vec3 world_pos = co0*a_weights[0] + co1*a_weights[1] + co2*a_weights[2];\n"
  62 "   vec3 world_normal = n0*a_weights[0] + n1*a_weights[1] + n2*a_weights[2];\n"
  63 "   \n"
  64 "   gl_Position = uPv * vec4( world_pos, 1.0 );\n"
  65 "   aColour = a_colour;\n"
  66 "   aUv = a_uv;\n"
  67 "   aNorm = world_normal;\n"
  68 "   aCo = a_co;\n"
  69 "   aWorldCo = world_pos;\n"
  70 "\n"
  71 "   // TODO:\n"
  72 "   aMotionVec0 = vec3(1.0);\n"
  73 "   aMotionVec1 = vec3(1.0);\n"
  74 "}\n"
  75 ""},
  76    .fs =
  77 {
  78 .static_src =
  79 "uniform sampler2D uTexMain;\n"
  80 "uniform vec3 uCamera;\n"
  81 "uniform vec3 uBoard0;\n"
  82 "uniform vec3 uBoard1;\n"
  83 "\n"
  84 "in vec4 aColour;\n"
  85 "in vec2 aUv;\n"
  86 "in vec3 aNorm;\n"
  87 "in vec3 aCo;\n"
  88 "in vec3 aWorldCo;\n"
  89 "\n"
  90 "#line       1        1 \n"
  91 "layout (location = 0) out vec4 oColour;\n"
  92 "\n"
  93 "layout (std140) uniform ub_world_lighting\n"
  94 "{\n"
  95 "   vec4 g_light_colours[3];\n"
  96 "   vec4 g_light_directions[3];\n"
  97 "   vec4 g_ambient_colour;\n"
  98 "\n"
  99 "   vec4 g_water_plane;\n"
 100 "   vec4 g_depth_bounds;\n"
 101 "   float g_water_fog;\n"
 102 "   int g_light_count;\n"
 103 "   int g_light_preview;\n"
 104 "   int g_shadow_samples;\n"
 105 "};\n"
 106 "\n"
 107 "uniform sampler2D g_world_depth;\n"
 108 "\n"
 109 "// Standard diffuse + spec models\n"
 110 "// ==============================\n"
 111 "\n"
 112 "vec3 do_light_diffuse( vec3 vfrag, vec3 wnormal )\n"
 113 "{\n"
 114 "   vec3 vtotal = g_ambient_colour.rgb;\n"
 115 "\n"
 116 "   for( int i=0; i<g_light_count; i++ )\n"
 117 "   {\n"
 118 "      vec3 vcolour = g_light_colours[i].rgb;\n"
 119 "      vec3 vdir = g_light_directions[i].xyz;\n"
 120 "\n"
 121 "      float flight = max(dot( vdir, wnormal )*0.75+0.25,0.0);\n"
 122 "      vtotal += vcolour*flight;\n"
 123 "   }\n"
 124 "\n"
 125 "   return vfrag * vtotal;\n"
 126 "}\n"
 127 "\n"
 128 "vec3 do_light_spec( vec3 vfrag, vec3 wnormal, vec3 halfview, float fintensity )\n"
 129 "{\n"
 130 "   vec3 vcolour = g_light_colours[0].rgb;\n"
 131 "   vec3 vdir = g_light_directions[0].xyz;\n"
 132 "\n"
 133 "   vec3 specdir = reflect( -vdir, wnormal );\n"
 134 "   float spec = pow(max(dot( halfview, specdir ), 0.0), 10.0);\n"
 135 "   return vfrag + vcolour*spec*fintensity;\n"
 136 "}\n"
 137 "\n"
 138 "float world_depth_sample( vec3 pos )\n"
 139 "{\n"
 140 "   vec2 depth_coord = (pos.xz - g_depth_bounds.xy) * g_depth_bounds.zw; \n"
 141 "   return texture( g_world_depth, depth_coord ).r;\n"
 142 "}\n"
 143 "\n"
 144 "float shadow_sample( vec3 vdir )\n"
 145 "{\n"
 146 "   vec3 sample_pos = aWorldCo + vdir;\n"
 147 "   float height_sample = world_depth_sample( sample_pos );\n"
 148 "\n"
 149 "   float fdelta = height_sample - sample_pos.y;\n"
 150 "   return clamp( fdelta, 0.1, 0.2 )-0.1;\n"
 151 "}\n"
 152 "\n"
 153 "vec3 do_light_shadowing_old( vec3 vfrag )\n"
 154 "{\n"
 155 "   float faccum = 0.0;\n"
 156 "   faccum += shadow_sample( vec3( 0.0, 0.5, 0.0 ));\n"
 157 "   faccum += shadow_sample( vec3( 2.0, 0.3, 0.0 ));\n"
 158 "   faccum += shadow_sample( vec3( 3.0, 1.0, 0.0 ));\n"
 159 "   faccum += shadow_sample( vec3( 5.0, 1.0, 0.0 ));\n"
 160 "   faccum += shadow_sample( vec3( 0.0, 0.5, 0.0 )*1.5);\n"
 161 "   faccum += shadow_sample( vec3( 2.0, 0.3, 0.0 )*1.5);\n"
 162 "   faccum += shadow_sample( vec3( 3.0, 1.0, 0.0 )*1.5);\n"
 163 "   faccum += shadow_sample( vec3( 5.0, 1.0, 0.0 )*1.5);\n"
 164 "   return mix( vfrag, g_ambient_colour.rgb, faccum );\n"
 165 "}\n"
 166 "\n"
 167 "// FIXME\n"
 168 "float sdLine( vec3 p, vec3 a, vec3 b )\n"
 169 "{\n"
 170 "  vec3 pa = p - a;\n"
 171 "  vec3 ba = b - a;\n"
 172 "\n"
 173 "  float h = clamp( dot(pa,ba)/dot(ba,ba), 0.0, 1.0 );\n"
 174 "  return length( pa - ba*h );\n"
 175 "}\n"
 176 "\n"
 177 "vec3 do_light_shadowing( vec3 vfrag )\n"
 178 "{\n"
 179 "   if( g_shadow_samples == 0 )\n"
 180 "   {\n"
 181 "      return vfrag;\n"
 182 "   }\n"
 183 "\n"
 184 "   float fspread = g_light_colours[0].w;\n"
 185 "   vec3  vdir = g_light_directions[0].xyz;\n"
 186 "   float flength = g_light_directions[0].w;\n"
 187 "\n"
 188 "   float famt = 0.0;\n"
 189 "   famt+=shadow_sample((vdir+vec3(-0.563, 0.550, 0.307)*fspread)*flength*0.1);\n"
 190 "   famt+=shadow_sample((vdir+vec3( 0.808, 0.686, 0.346)*fspread)*flength*0.2);\n"
 191 "   famt+=shadow_sample((vdir+vec3( 0.787, 0.074,-0.065)*fspread)*flength*0.3);\n"
 192 "   famt+=shadow_sample((vdir+vec3(-0.593, 0.071,-0.425)*fspread)*flength*0.4);\n"
 193 "   famt+=shadow_sample((vdir+vec3(-0.790,-0.933,-0.875)*fspread)*flength*0.5);\n"
 194 "   famt+=shadow_sample((vdir+vec3( 0.807,-0.690, 0.472)*fspread)*flength*0.6);\n"
 195 "   famt+=shadow_sample((vdir+vec3( 0.522,-0.379, 0.350)*fspread)*flength*0.7);\n"
 196 "   famt+=shadow_sample((vdir+vec3( 0.483, 0.201, 0.306)*fspread)*flength*0.8);\n"
 197 "\n"
 198 "   // player shadow\n"
 199 "   float dist_to_player = max( 0.0, sdLine( aWorldCo, uBoard0, uBoard1 )-0.03 );\n"
 200 "   float player_shadow = max( 1.0-dist_to_player*1.7, 0.0 );\n"
 201 "   player_shadow *= player_shadow*player_shadow*player_shadow;\n"
 202 "\n"
 203 "   famt = max( player_shadow*0.6, famt );\n"
 204 "   return mix( vfrag, g_ambient_colour.rgb, famt );\n"
 205 "}\n"
 206 "\n"
 207 "vec3 apply_fog( vec3 vfrag, float fdist )\n"
 208 "{\n"
 209 "   float dist = pow(fdist*0.0008,1.2);\n"
 210 "   return mix( vfrag, vec3(0.55,0.76,1.0), min( 1.0, dist ) );\n"
 211 "}\n"
 212 "\n"
 213 "#line     13        0 \n"
 214 "#line       1        2 \n"
 215 "const float k_motion_lerp_amount = 0.01;\n"
 216 "\n"
 217 "#line      2        0 \n"
 218 "\n"
 219 "layout (location = 1) out vec2 oMotionVec;\n"
 220 "\n"
 221 "in vec3 aMotionVec0;\n"
 222 "in vec3 aMotionVec1;\n"
 223 "\n"
 224 "void compute_motion_vectors()\n"
 225 "{\n"
 226 "   // Write motion vectors\n"
 227 "   vec2 vmotion0 = aMotionVec0.xy / aMotionVec0.z;\n"
 228 "   vec2 vmotion1 = aMotionVec1.xy / aMotionVec1.z;\n"
 229 "\n"
 230 "   oMotionVec = (vmotion1-vmotion0) * (1.0/k_motion_lerp_amount);\n"
 231 "}\n"
 232 "\n"
 233 "#line     14        0 \n"
 234 "\n"
 235 "void main()\n"
 236 "{\n"
 237 "   compute_motion_vectors();\n"
 238 "\n"
 239 "   vec3 vfrag = texture( uTexMain, aUv ).rgb;\n"
 240 "\n"
 241 "   // Lighting\n"
 242 "   vec3 halfview = uCamera - aWorldCo;\n"
 243 "   float fdist = length( halfview );\n"
 244 "   halfview /= fdist;\n"
 245 "   fdist -= 0.08;\n"
 246 "\n"
 247 "   vec3 qnorm = normalize(floor(aNorm*2.0)*0.5) + vec3(0.001,0.0,0.0);\n"
 248 "\n"
 249 "   vfrag = mix( vfrag, do_light_diffuse( vfrag, qnorm ), 0.5 );\n"
 250 "   //vfrag = do_light_spec( vfrag, qnorm, halfview, 0.1 );\n"
 251 "   vfrag = do_light_shadowing( vfrag );\n"
 252 "   vfrag = apply_fog( vfrag, fdist );\n"
 253 "\n"
 254 "   float opacity = clamp( fdist*fdist, 0.0, 1.0 );\n"
 255 "   oColour = vec4(vfrag,opacity);\n"
 256 "}\n"
 257 ""},
 258 };
 259
 260 static GLuint _uniform_viewchar_uPv;
 261 static GLuint _uniform_viewchar_uTransforms;
 262 static GLuint _uniform_viewchar_uTexMain;
 263 static GLuint _uniform_viewchar_uCamera;
 264 static GLuint _uniform_viewchar_uBoard0;
 265 static GLuint _uniform_viewchar_uBoard1;
 266 static GLuint _uniform_viewchar_g_world_depth;
 267 static void shader_viewchar_uPv(m4x4f m){
 268    glUniformMatrix4fv(_uniform_viewchar_uPv,1,GL_FALSE,(float*)m);
 269 }
 270 static void shader_viewchar_uTexMain(int i){
 271    glUniform1i(_uniform_viewchar_uTexMain,i);
 272 }
 273 static void shader_viewchar_uCamera(v3f v){
 274    glUniform3fv(_uniform_viewchar_uCamera,1,v);
 275 }
 276 static void shader_viewchar_uBoard0(v3f v){
 277    glUniform3fv(_uniform_viewchar_uBoard0,1,v);
 278 }
 279 static void shader_viewchar_uBoard1(v3f v){
 280    glUniform3fv(_uniform_viewchar_uBoard1,1,v);
 281 }
 282 static void shader_viewchar_g_world_depth(int i){
 283    glUniform1i(_uniform_viewchar_g_world_depth,i);
 284 }
 285 static void shader_viewchar_register(void){
 286    vg_shader_register( &_shader_viewchar );
 287 }
 288 static void shader_viewchar_use(void){ glUseProgram(_shader_viewchar.id); }
 289 static void shader_viewchar_link(void){
 290    _uniform_viewchar_uPv = glGetUniformLocation( _shader_viewchar.id, "uPv" );
 291    _uniform_viewchar_uTransforms = glGetUniformLocation( _shader_viewchar.id, "uTransforms" );
 292    _uniform_viewchar_uTexMain = glGetUniformLocation( _shader_viewchar.id, "uTexMain" );
 293    _uniform_viewchar_uCamera = glGetUniformLocation( _shader_viewchar.id, "uCamera" );
 294    _uniform_viewchar_uBoard0 = glGetUniformLocation( _shader_viewchar.id, "uBoard0" );
 295    _uniform_viewchar_uBoard1 = glGetUniformLocation( _shader_viewchar.id, "uBoard1" );
 296    _uniform_viewchar_g_world_depth = glGetUniformLocation( _shader_viewchar.id, "g_world_depth" );
 297 }
 298 #endif /* SHADER_viewchar_H */