source/programbuilder.cpp

   1 #include <algorithm>
   2 #include <cstring>
   3 #include <set>
   4 #include <msp/gl/extensions/arb_uniform_buffer_object.h>
   5 #include <msp/strings/format.h>
   6 #include <msp/strings/utils.h>
   7 #include "extension.h"
   8 #include "program.h"
   9 #include "programbuilder.h"
  10 #include "shader.h"
  11 #include "vertexformat.h"
  12
  13 using namespace std;
  14
  15 namespace Msp {
  16 namespace GL {
  17
  18 /*
  19 Naming conventions:
  20   n_*        Normalized vector
  21   l_*        Lighting component
  22
  23   obj_*      Object space
  24   eye_*      Eye space
  25   tbn_*      Tangent-Binormal-Normal space
  26   shd_*      Shadow space
  27   env_*      Environment space
  28   *_dir      Direction vector
  29
  30   zzz_*      Wildcard space, resolved by the builder
  31              All wildcard spaces within an expression must match
  32
  33   xxx_yyy_*  Matrix that transforms between yyy to xxx
  34              The vector is on the side of its designated space, result will be
  35              in the other space
  36   *_matrix   A matrix (duh)
  37   *_rmatrix  A mat4 that works with a row vector
  38
  39   rgb_*      Color with rgb components only
  40   color_*    Color with rgba components
  41 */
  42
  43 /* The array is stored in reverse order, so that variables always come after
  44 anything that might need them. */
  45 const ProgramBuilder::VariableDefinition ProgramBuilder::standard_variables[] =
  46 {
  47         { FRAGMENT, "gl_FragColor", "vec4", "frag_color", 0 },
  48         { FRAGMENT, "frag_color", "vec4", "incoming_color", "!f" },
  49         { FRAGMENT, "frag_color", "vec4", "vec4(mix(fog_color.rgb, incoming_color.rgb, fog_value), incoming_color.a)", "f" },
  50         { FRAGMENT, "fog_value", "float", "exp(-fog_coord*fog_density)", 0 },
  51
  52         { FRAGMENT, "incoming_color", "vec4", "basic_color", "!e!l" },
  53         { FRAGMENT, "incoming_color", "vec4", "vec4(rgb_surface, surface_alpha)", "!el" },
  54         { FRAGMENT, "incoming_color", "vec4", "vec4(rgb_surface+rgb_reflection, surface_alpha)", "e" },
  55
  56         { FRAGMENT, "rgb_reflection", "vec3", "reflect_sample.rgb*reflectivity", 0 },
  57         { FRAGMENT, "reflect_sample", "vec4", "textureCube(environment, env_reflect_dir)", 0 },
  58         { FRAGMENT, "env_reflect_dir", "vec3", "env_eye_matrix*eye_reflect_dir", 0 },
  59         { FRAGMENT, "eye_reflect_dir", "vec3", "eye_tbn_matrix*tbn_reflect_dir", "n" },
  60
  61         { FRAGMENT, "rgb_surface", "vec3", "rgb_unlit_surface", "!l" },
  62         { FRAGMENT, "rgb_surface", "vec3", "rgb_lit_surface", "l" },
  63         { FRAGMENT, "rgb_unlit_surface", "vec3", "basic_color.rgb", "!s" },
  64         { FRAGMENT, "rgb_unlit_surface", "vec3", "basic_color.rgb*l_shadow", "s" },
  65         { FRAGMENT, "rgb_lit_surface", "vec3", "rgb_illumination_diffuse", "!m!t" },
  66         { FRAGMENT, "rgb_lit_surface", "vec3", "rgb_illumination_diffuse*diffuse_sample.rgb", "!mt" },
  67         { FRAGMENT, "rgb_lit_surface", "vec3", "rgb_surface_ambient+rgb_surface_diffuse", "m!p" },
  68         { FRAGMENT, "rgb_lit_surface", "vec3", "rgb_surface_ambient+rgb_surface_diffuse+rgb_surface_specular", "mp" },
  69
  70         { FRAGMENT, "surface_alpha", "float", "basic_color.a", "!m" },
  71         { FRAGMENT, "surface_alpha", "float", "basic_color.a", "m!l" },
  72         { FRAGMENT, "surface_alpha", "float", "material.diffuse.a", "ml!t" },
  73         { FRAGMENT, "surface_alpha", "float", "material.diffuse.a*diffuse_sample.a", "mlt" },
  74         { FRAGMENT, "basic_color", "vec4", "vec4(1.0)", "!m!t" },
  75         { FRAGMENT, "basic_color", "vec4", "diffuse_sample", "!mt" },
  76         { FRAGMENT, "basic_color", "vec4", "color", "m!t" },
  77         { FRAGMENT, "basic_color", "vec4", "color*diffuse_sample", "mt" },
  78
  79         { FRAGMENT, "rgb_surface_ambient", "vec3", "rgb_illumination_ambient*material.ambient.rgb", "!t" },
  80         { FRAGMENT, "rgb_surface_ambient", "vec3", "rgb_illumination_ambient*material.ambient.rgb*diffuse_sample.rgb", "t" },
  81         { FRAGMENT, "rgb_illumination_ambient", "vec3", "ambient_color.rgb", "!y" },
  82         { FRAGMENT, "rgb_illumination_ambient", "vec3", "ambient_color.rgb+l_skylight*sky_color.rgb", "y" },
  83         { FRAGMENT, "l_skylight", "float", "dot(n_zzz_normal, zzz_sky_dir)*0.5+0.5", 0 },
  84
  85         { FRAGMENT, "rgb_surface_specular", "vec3", "rgb_illumination_specular*material.specular.rgb", 0 },
  86         { FRAGMENT, "rgb_illumination_specular", "vec3", "rgb_illumination_specular_direct", "!y|e" },
  87         { FRAGMENT, "rgb_illumination_specular", "vec3", "rgb_illumination_specular_direct+l_sky_specular*sky_color.rgb", "y!e" },
  88         { FRAGMENT, "rgb_illumination_specular_direct", "vec3", "rgb_light_specular", "!s" },
  89         { FRAGMENT, "rgb_illumination_specular_direct", "vec3", "rgb_light_specular*l_shadow", "s" },
  90         { FRAGMENT, "rgb_light_specular[i]", "vec3", "l_specular[i]*light_sources[i].specular.rgb", 0 },
  91         { FRAGMENT, "l_sky_specular", "float", "pow((1.0-pow(clamp(dot(zzz_reflect_dir, zzz_sky_dir)-horizon_limit, -1.0, 0.0), 2.0)), material.shininess/2.0)", 0 },
  92         { FRAGMENT, "l_specular[i]", "float", "pow(max(dot(n_zzz_half_vec[i], n_zzz_normal), 0.0), material.shininess)", 0 },
  93
  94         { FRAGMENT, "rgb_surface_diffuse", "vec3", "rgb_illumination_diffuse*material.diffuse.rgb", "!t" },
  95         { FRAGMENT, "rgb_surface_diffuse", "vec3", "rgb_illumination_diffuse*material.diffuse.rgb*diffuse_sample.rgb", "t" },
  96         { FRAGMENT, "rgb_illumination_diffuse", "vec3", "rgb_light_diffuse", "!s" },
  97         { FRAGMENT, "rgb_illumination_diffuse", "vec3", "rgb_light_diffuse*l_shadow", "s" },
  98         { FRAGMENT, "rgb_light_diffuse[i]", "vec3", "l_diffuse[i]*light_sources[i].diffuse.rgb", 0 },
  99         { FRAGMENT, "l_diffuse[i]", "float", "max(dot(n_zzz_normal, n_zzz_light_dir[i]), 0.0)", 0 },
 100
 101         { FRAGMENT, "l_shadow", "float", "mix(1.0, shadow_sample, shadow_darkness)", 0 },
 102         { FRAGMENT, "shadow_sample", "float", "shadow2D(shadow, shd_vertex)", 0 },
 103
 104         { FRAGMENT, "zzz_reflect_dir", "vec3", "reflect(zzz_incident_dir, n_zzz_normal)", 0 },
 105         { FRAGMENT, "n_zzz_half_vec[i]", "vec3", "normalize(zzz_light_dir[i]-zzz_incident_dir)", 0 },
 106         { FRAGMENT, "n_zzz_light_dir[i]", "vec3", "normalize(zzz_light_dir[i])", 0 },
 107         { FRAGMENT, "n_tbn_normal", "vec3", "normal_sample*2.0-1.0", "n" },
 108         { FRAGMENT, "n_eye_normal", "vec3", "normalize(eye_normal)", "!n" },
 109         { FRAGMENT, "normal_sample", "vec3", "texture2D(normalmap, texture_coord).xyz", 0 },
 110         { FRAGMENT, "diffuse_sample", "vec4", "texture2D(diffusemap, texture_coord)", 0 },
 111
 112         { VERTEX, "gl_Position", "vec4", "projection_matrix*eye_vertex", 0 },
 113         { VERTEX, "gl_ClipDistance[i]", "float", "dot(eye_vertex, clip_planes[i].equation)", "c" },
 114         { VERTEX, "fog_coord", "float", "-eye_vertex.z", 0 },
 115         { VERTEX, "shd_vertex", "vec3", "(shd_eye_matrix*eye_vertex).xyz", 0 },
 116         { VERTEX, "tbn_sky_dir", "vec3", "eye_sky_dir*eye_tbn_matrix", "n" },
 117         { VERTEX, "tbn_light_dir[i]", "vec3", "eye_light_dir[i]*eye_tbn_matrix", 0 },
 118         { VERTEX, "eye_light_dir[i]", "vec3", "normalize(eye_light_position[i].xyz-eye_vertex.xyz*eye_light_position[i].w)", 0 },
 119         { VERTEX, "eye_light_position[i]", "vec4", "light_sources[i].position", 0 },
 120         { VERTEX, "tbn_incident_dir", "vec3", "eye_incident_dir*eye_tbn_matrix", 0 },
 121         { VERTEX, "eye_incident_dir", "vec3", "normalize(eye_vertex.xyz)", 0 },
 122         { VERTEX, "eye_tbn_matrix", "mat3", "mat3(eye_tangent, eye_binormal, eye_normal)", 0 },
 123         { VERTEX, "eye_vertex", "vec4", "eye_obj_matrix*vertex", 0 },
 124         { VERTEX, "eye_normal", "vec3", "eye_obj_normal_matrix*normal", 0 },
 125         { VERTEX, "eye_tangent", "vec3", "eye_obj_normal_matrix*tangent", 0 },
 126         { VERTEX, "eye_binormal", "vec3", "eye_obj_normal_matrix*binormal", 0 },
 127         { VERTEX, "texture_coord", "vec2", "texcoord.xy", 0 },
 128
 129         { ATTRIBUTE, "vertex", "vec4", "gl_Vertex", 0 },
 130         { ATTRIBUTE, "texcoord", "vec4", "gl_MultiTexCoord0", 0 },
 131         { ATTRIBUTE, "color", "vec4", "gl_Color", 0 },
 132         { ATTRIBUTE, "normal", "vec3", "gl_Normal", 0 },
 133         { ATTRIBUTE, "tangent", "vec3", 0, 0 },
 134         { ATTRIBUTE, "binormal", "vec3", 0, 0 },
 135
 136         { UNIFORM, "diffusemap", "sampler2D", 0, 0 },
 137         { UNIFORM, "shadow", "sampler2DShadow", 0, 0 },
 138         { UNIFORM, "ShadowMap::shadow_darkness", "float", 0, 0 },
 139         { UNIFORM, "normalmap", "sampler2D", 0, 0 },
 140         { UNIFORM, "environment", "samplerCube", 0, 0 },
 141         { UNIFORM, "EnvMap::env_eye_matrix", "mat3", 0, 0 },
 142         { UNIFORM, "Material::reflectivity", "float", 0, 0 },
 143         { UNIFORM, "eye_obj_matrix", "mat4", "gl_ModelViewMatrix", 0 },
 144         { UNIFORM, "eye_obj_normal_matrix", "mat3", "gl_NormalMatrix", 0 },
 145         { UNIFORM, "Transform::projection_matrix", "mat4", "gl_ProjectionMatrix", 0 },
 146         { UNIFORM, "ShadowMap::shd_eye_matrix", "mat4", 0, 0 },
 147         { UNIFORM, "Lighting::light_sources", "LightSourceParameters[MAX_LIGHTS]", "gl_LightSource[i]", 0 },
 148         { UNIFORM, "Lighting::ambient_color", "vec4", "gl_LightModel.ambient", 0 },
 149         { UNIFORM, "Lighting::sky_color", "vec4", 0, 0 },
 150         { UNIFORM, "Lighting::eye_sky_dir", "vec3", 0, 0 },
 151         { UNIFORM, "Lighting::horizon_limit", "float", 0, 0 },
 152         { UNIFORM, "Lighting::fog_color", "vec4", "gl_Fog.color", 0 },
 153         { UNIFORM, "Lighting::fog_density", "float", "gl_Fog.density", 0 },
 154         { UNIFORM, "Material::material", "MaterialParameters", "gl_FrontMaterial", 0 },
 155         { UNIFORM, "Clipping::clip_planes", "ClipPlane[MAX_CLIP_PLANES]", 0, 0 },
 156
 157         { TYPE, "LightSourceParameters", "struct { vec4 position; vec4 diffuse; vec4 specular; }", "gl_LightSourceParameters", 0 },
 158         { TYPE, "MaterialParameters", "struct { vec4 ambient; vec4 diffuse; vec4 specular; float shininess; }", "gl_MaterialParameters", 0 },
 159         { TYPE, "ClipPlane", "struct { vec4 equation; }", 0, 0 },
 160
 161         // Terminator entry
 162         { NO_SCOPE, 0, 0, 0, 0 }
 163 };
 164
 165 const char ProgramBuilder::interfaces[] = { 0, 0, 0, 0, 0, 'v', 0 };
 166
 167 ProgramBuilder::ProgramBuilder(const StandardFeatures &f):
 168         features(f),
 169         feature_flags(features.create_flags()),
 170         optimize(true)
 171 {
 172         if(!features.custom.empty())
 173         {
 174                 const char *whitespace = " \t\n";
 175                 string::size_type start = 0;
 176                 while(1)
 177                 {
 178                         start = features.custom.find_first_not_of(whitespace, start);
 179                         if(start==string::npos)
 180                                 break;
 181
 182                         string::size_type semicolon = features.custom.find(';', start);
 183                         if(semicolon==start)
 184                         {
 185                                 ++start;
 186                                 continue;
 187                         }
 188                         else if(semicolon==string::npos)
 189                                 throw invalid_variable_definition(features.custom.substr(start));
 190
 191                         string::size_type equals = features.custom.find('=', start);
 192                         if(equals>semicolon)
 193                                 equals = string::npos;
 194
 195                         VariableDefinition var;
 196                         string::size_type decl_end = min(equals, semicolon);
 197                         for(unsigned i=0;; ++i)
 198                         {
 199                                 string::size_type word_end = features.custom.find_first_of(whitespace, start);
 200                                 word_end = min(word_end, decl_end);
 201                                 features.custom[word_end] = 0;
 202
 203                                 const char *word = &features.custom[start];
 204                                 if(i==0)
 205                                 {
 206                                         if(!strcmp(word, "uniform"))
 207                                                 var.scope = UNIFORM;
 208                                         else if(!strcmp(word, "attribute"))
 209                                                 var.scope = ATTRIBUTE;
 210                                         else if(!strcmp(word, "vertex"))
 211                                                 var.scope = VERTEX;
 212                                         else if(!strcmp(word, "fragment"))
 213                                                 var.scope = FRAGMENT;
 214                                         else if(!strcmp(word, "function"))
 215                                                 var.scope = FUNCTION;
 216                                         else
 217                                                 throw invalid_variable_definition(word);
 218                                 }
 219                                 else if(i==1)
 220                                         var.type = word;
 221                                 else if(i==2)
 222                                         var.name = word;
 223
 224                                 start = features.custom.find_first_not_of(whitespace, word_end+1);
 225                                 if(start>=decl_end || (var.scope==FUNCTION && features.custom[start]=='('))
 226                                         break;
 227                         }
 228
 229                         if(equals!=string::npos)
 230                         {
 231                                 if(var.scope==FUNCTION)
 232                                         throw invalid_variable_definition("function with expression");
 233                                 start = features.custom.find_first_not_of(whitespace, equals+1);
 234                                 if(start>=semicolon)
 235                                         throw invalid_variable_definition("no expression");
 236                                 features.custom[semicolon] = 0;
 237                                 var.expression = &features.custom[start];
 238                         }
 239                         else if(var.scope==FUNCTION)
 240                         {
 241                                 string::size_type left_paren = features.custom.find('(', start);
 242                                 string::size_type right_paren = features.custom.find(')', start);
 243                                 if(left_paren>semicolon || right_paren>semicolon)
 244                                         throw invalid_variable_definition("no argument list");
 245                                 features.custom[right_paren] = 0;
 246                                 var.expression = &features.custom[left_paren+1];
 247                         }
 248                         else
 249                                 var.expression = 0;
 250
 251                         var.flags = 0;
 252                         for(const VariableDefinition *j=standard_variables; j->name; ++j)
 253                                 if(!strcmp(var.name, j->name))
 254                                         var.flags = "o";
 255
 256                         custom_variables.push_front(var);
 257
 258                         start = semicolon+1;
 259                 }
 260         }
 261
 262         if(!features.legacy)
 263         {
 264                 aliases["texture1D"] = "texture";
 265                 aliases["texture2D"] = "texture";
 266                 aliases["texture3D"] = "texture";
 267                 aliases["textureCube"] = "texture";
 268                 aliases["shadow2D"] = "texture";
 269         }
 270         else
 271                 aliases["shadow2D"] = "shadow2D(...).r";
 272 }
 273
 274 void ProgramBuilder::set_optimize(bool o)
 275 {
 276         optimize = o;
 277 }
 278
 279 Program *ProgramBuilder::create_program() const
 280 {
 281         Program *prog = new Program;
 282         add_shaders(*prog);
 283         return prog;
 284 }
 285
 286 void ProgramBuilder::add_shaders(Program &prog) const
 287 {
 288         list<ShaderVariable> variables;
 289         list<ShaderVariable *> resolved_vars;
 290
 291         if(features.clipping)
 292                 variables.push_back(ShaderVariable("gl_ClipDistance[i]"));
 293         variables.push_front(ShaderVariable("gl_Position"));
 294         variables.push_front(ShaderVariable(features.legacy ? "gl_FragColor" : "frag_color"));
 295
 296         list<VariableDefinition>::const_iterator next_custom = custom_variables.begin();
 297         for(const VariableDefinition *i=standard_variables; i->name; )
 298         {
 299                 const VariableDefinition *def = 0;
 300                 if(next_custom!=custom_variables.end() && (!strcmp(next_custom->name, i->name) || !next_custom->flags))
 301                 {
 302                         def = &*next_custom;
 303                         ++next_custom;
 304                 }
 305                 else
 306                 {
 307                         def = i;
 308                         ++i;
 309
 310                         // Skip over anything that isn't used with the supplied flags
 311                         if(def->flags && !evaluate_flags(def->flags))
 312                                 continue;
 313                 }
 314
 315                 if(def->scope==TYPE)
 316                 {
 317                         for(list<ShaderVariable *>::iterator j=resolved_vars.begin(); j!=resolved_vars.end(); ++j)
 318                                 if(!(*j)->type && name_match(def->name, (*j)->variable->type))
 319                                         (*j)->resolve_type(*def);
 320
 321                         continue;
 322                 }
 323
 324                 const char *def_uq_name = unqualified_name(def->name);
 325
 326                 // See if this variable can satisfy any unresolved variables
 327                 ShaderVariable *last_resolved = 0;
 328                 for(list<ShaderVariable>::iterator j=variables.begin(); j!=variables.end(); ++j)
 329                 {
 330                         if(j->variable)
 331                                 continue;
 332
 333                         if(!name_match(def_uq_name, j->resolved_name.c_str()))
 334                                 continue;
 335
 336                         if(last_resolved)
 337                         {
 338                                 /* We've already resolved a non-fuzzy variable in this iteration.
 339                                 If there are multiple variables that can be resolved, they refer
 340                                 to the same variable. */
 341                                 j->resolve(*last_resolved);
 342                                 continue;
 343                         }
 344
 345                         j->resolve(*def);
 346                         resolved_vars.push_front(&*j);
 347                         if(!j->fuzzy_space)
 348                                 last_resolved = &*j;
 349
 350                         if(!def->expression)
 351                                 continue;
 352
 353                         vector<string> identifiers = extract_identifiers(def->expression);
 354                         for(vector<string>::const_iterator k=identifiers.begin(); k!=identifiers.end(); ++k)
 355                         {
 356                                 // Use an existing variable if possible, but only if it's not fuzzy
 357                                 ShaderVariable *var = 0;
 358                                 for(list<ShaderVariable>::iterator l=variables.begin(); (!var && l!=variables.end()); ++l)
 359                                         if(!l->fuzzy_space && l->resolved_name==*k)
 360                                                 var = &*l;
 361
 362                                 if(!var)
 363                                 {
 364                                         variables.push_back(ShaderVariable(*k));
 365                                         var = &variables.back();
 366                                 }
 367                                 j->add_reference(*var);
 368                         }
 369                 }
 370         }
 371
 372         // Array sizes need to be resolved for inline processing
 373         for(list<ShaderVariable>::iterator i=variables.end(); i!=variables.begin(); )
 374                 (--i)->resolve_array(features);
 375
 376         bool legacy_variables = evaluate_flags("g");
 377         for(list<ShaderVariable *>::const_iterator i=resolved_vars.begin(); i!=resolved_vars.end(); ++i)
 378                 (*i)->check_inline(legacy_variables, !optimize);
 379
 380         prog.attach_shader_owned(new VertexShader(create_source(resolved_vars, VERTEX)));
 381         prog.attach_shader_owned(new FragmentShader(create_source(resolved_vars, FRAGMENT)));
 382
 383         if(!features.legacy)
 384         {
 385                 // OpenGL ES does not support binding fragment shader outputs
 386                 if(get_gl_api()!=OPENGL_ES2)
 387                         prog.bind_fragment_data(0, "frag_color");
 388
 389                 prog.bind_attribute(VERTEX4, "vertex");
 390                 if(features.lighting)
 391                         prog.bind_attribute(NORMAL3, "normal");
 392                 else if(features.material)
 393                         prog.bind_attribute(COLOR4_FLOAT, "color");
 394                 if(features.texture || features.normalmap)
 395                         prog.bind_attribute(TEXCOORD4, "texcoord");
 396         }
 397         if(features.normalmap)
 398         {
 399                 prog.bind_attribute(get_component_type(TANGENT3), "tangent");
 400                 prog.bind_attribute(get_component_type(BINORMAL3), "binormal");
 401         }
 402 }
 403
 404 string ProgramBuilder::create_source(const list<ShaderVariable *> &variables, VariableScope scope) const
 405 {
 406         string source;
 407
 408         bool use_blocks = !features.legacy && ARB_uniform_buffer_object;
 409
 410         if(!features.legacy)
 411         {
 412                 if(get_gl_api()==OPENGL_ES2)
 413                 {
 414                         if(use_blocks)
 415                                 source += "#version 300 es\n";
 416                 }
 417                 else
 418                 {
 419                         source += "#version 130\n";
 420                         if(use_blocks)
 421                                 source += "#extension GL_ARB_uniform_buffer_object: require\n";
 422                 }
 423         }
 424
 425         if(get_gl_api()==OPENGL_ES2)
 426                 source += "precision mediump float;\n";
 427
 428         set<const VariableDefinition *> declared_types;
 429         set<string> uniform_blocks;
 430         for(list<ShaderVariable *>::const_iterator i=variables.begin(); i!=variables.end(); ++i)
 431         {
 432                 if(!(*i)->is_referenced_from(scope))
 433                         continue;
 434
 435                 if((*i)->variable->scope==FUNCTION)
 436                         source += format("%s;\n", (*i)->create_declaration());
 437                 else if((*i)->variable->scope==UNIFORM && !(*i)->inlined)
 438                 {
 439                         if((*i)->type && !declared_types.count((*i)->type))
 440                         {
 441                                 source += format("%s;\n", (*i)->create_type_declaration());
 442                                 declared_types.insert((*i)->type);
 443                         }
 444
 445                         if(!(*i)->resolved_block.empty() && use_blocks)
 446                                 uniform_blocks.insert((*i)->resolved_block);
 447                         else
 448                                 source += format("uniform %s;\n", (*i)->create_declaration());
 449                 }
 450         }
 451
 452         for(set<string>::const_iterator i=uniform_blocks.begin(); i!=uniform_blocks.end(); ++i)
 453         {
 454                 source += format("uniform %s\n{\n", *i);
 455                 for(list<ShaderVariable *>::const_iterator j=variables.begin(); j!=variables.end(); ++j)
 456                         if((*j)->resolved_block==*i)
 457                                 source += format("\t%s;\n", (*j)->create_declaration());
 458                 source += "};\n";
 459         }
 460
 461         /* Interface variables need to have global declarations. */
 462         for(list<ShaderVariable *>::const_iterator i=variables.begin(); i!=variables.end(); ++i)
 463         {
 464                 if(!(*i)->resolved_name.compare(0, 3, "gl_"))
 465                         continue;
 466
 467                 InterfaceFlags iface = (*i)->get_interface_flags(scope);
 468
 469                 if(iface&INPUT)
 470                 {
 471                         const char *qualifier = (features.legacy ? scope==VERTEX ? "attribute" : "varying" : "in");
 472                         source += format("%s %s;\n", qualifier, (*i)->create_declaration(interfaces[scope-1]));
 473                 }
 474
 475                 if(iface&OUTPUT)
 476                 {
 477                         const char *qualifier = (features.legacy ? "varying" : "out");
 478                         source += format("%s %s;\n", qualifier, (*i)->create_declaration(interfaces[scope]));
 479                 }
 480         }
 481
 482         // The clip distance array must be declared manually to give it a size
 483         if(scope==VERTEX && features.clipping)
 484                 source += format("out float gl_ClipDistance[%d];\n", features.max_clip_planes);
 485
 486         source += "void main()\n{\n";
 487
 488         list<ShaderVariable *> loop_vars;
 489         unsigned loop_size = 0;
 490         for(list<ShaderVariable *>::const_iterator i=variables.begin(); i!=variables.end(); ++i)
 491         {
 492                 if(!loop_vars.empty() && !loop_vars.back()->in_loop && (*i)->array_size!=loop_size)
 493                 {
 494                         /* Declare all variables that need to be visible outside the loop.
 495                         Output variables are already declared. */
 496                         for(list<ShaderVariable *>::const_iterator j=loop_vars.begin(); j!=loop_vars.end(); ++j)
 497                         {
 498                                 InterfaceFlags iface = (*j)->get_interface_flags(scope);
 499                                 if(!(*j)->in_loop && !(iface&OUTPUT))
 500                                         source += format("\t%s;\n", (*j)->create_declaration());
 501                         }
 502
 503                         source += format("\tfor(int i=0; i<%d; ++i)\n\t{\n", loop_size);
 504                         for(list<ShaderVariable *>::const_iterator j=loop_vars.begin(); j!=loop_vars.end(); ++j)
 505                         {
 506                                 if((*j)->variable->scope==scope && !(*j)->inlined)
 507                                 {
 508                                         string decl;
 509                                         if((*j)->in_loop)
 510                                                 decl = (*j)->create_declaration(0, true);
 511                                         else
 512                                         {
 513                                                 decl = (*j)->resolved_name;
 514                                                 if(!(*j)->array_sum)
 515                                                         decl += "[i]";
 516                                         }
 517                                         const char *oper = ((*j)->array_sum ? "+=" : "=");
 518                                         source += format("\t\t%s %s %s;\n", decl, oper, create_expression(**j, "i"));
 519                                 }
 520
 521                                 InterfaceFlags iface = (*j)->get_interface_flags(scope);
 522                                 if((iface&(OUTPUT|GOAL))==OUTPUT)
 523                                 {
 524                                         string expr = ((*j)->inlined ? create_expression(**j, "i") : (*j)->resolved_name+"[i]");
 525                                         source += format("\t\t%c_%s[i] = %s;\n", interfaces[scope], (*j)->resolved_name, expr);
 526                                 }
 527                         }
 528                         source += "\t}\n";
 529
 530                         loop_vars.clear();
 531                 }
 532
 533                 InterfaceFlags iface = (*i)->get_interface_flags(scope);
 534
 535                 if((*i)->array_size>1 || ((*i)->array_size==1 && (iface&GOAL)))
 536                 {
 537                         if((*i)->variable->scope==scope || (iface&OUTPUT))
 538                         {
 539                                 loop_size = (*i)->array_size;
 540                                 loop_vars.push_back(*i);
 541                         }
 542                         continue;
 543                 }
 544
 545                 if((*i)->variable->scope==scope && !(*i)->inlined)
 546                 {
 547                         string decl = ((iface&GOAL) ? (*i)->resolved_name : (*i)->create_declaration());
 548                         source += format("\t%s = %s;\n", decl, create_expression(**i));
 549                 }
 550
 551                 if((iface&(OUTPUT|GOAL))==OUTPUT)
 552                 {
 553                         string expr = ((*i)->inlined ? create_expression(**i) : (*i)->resolved_name);
 554                         source += format("\t%c_%s = %s;\n", interfaces[scope], (*i)->resolved_name, expr);
 555                 }
 556         }
 557
 558         source += '}';
 559
 560         return source;
 561 }
 562
 563 bool ProgramBuilder::evaluate_flags(const char *flags) const
 564 {
 565         if(!flags)
 566                 return true;
 567
 568         bool cond = true;
 569         char oper = '&';
 570         for(const char *i=flags; *i; ++i)
 571         {
 572                 if(*i>='a' && *i<='z')
 573                 {
 574                         bool found = (feature_flags.find(*i)!=string::npos);
 575                         if(oper=='|')
 576                                 cond = (cond || found);
 577                         else if(oper=='!')
 578                                 cond = (cond && !found);
 579                         else if(oper=='&')
 580                                 cond = (cond && found);
 581                         oper = '&';
 582                 }
 583                 else
 584                         oper = *i;
 585         }
 586
 587         return cond;
 588 }
 589
 590 const char *ProgramBuilder::unqualified_name(const char *name)
 591 {
 592         for(const char *p=name; *p; ++p)
 593                 if(*p==':' && *++p==':')
 594                         name = p+1;
 595         return name;
 596 }
 597
 598 ProgramBuilder::MatchType ProgramBuilder::name_match(const char *n1, const char *n2, const char **space)
 599 {
 600         int i = 0;
 601         int zzz = -1;
 602         int zside = 0;
 603         while(*n1 && *n2)
 604         {
 605                 if(*n1==*n2 || *n1=='z' || *n2=='z')
 606                 {
 607                         if(*n1!=*n2)
 608                         {
 609                                 int side = (*n1=='z' ? 1 : 2);
 610                                 if(zzz<0)
 611                                 {
 612                                         zzz = i;
 613                                         zside = side;
 614                                         if(space)
 615                                         {
 616                                                 if(*n1=='z')
 617                                                         *space = n2;
 618                                                 else
 619                                                         *space = n1;
 620                                         }
 621                                 }
 622                                 else if(i>=zzz+3 || side!=zside)
 623                                         return NO_MATCH;
 624                         }
 625                 }
 626                 else
 627                         return NO_MATCH;
 628                 ++n1;
 629                 ++n2;
 630                 ++i;
 631         }
 632         return (!*n1 && !*n2) ? (zzz>=0 ? FUZZY : EXACT) : ((*n1=='[' || *n2=='[') ? ARRAY : NO_MATCH);
 633 }
 634
 635 bool ProgramBuilder::parse_identifier(const char *ptr, unsigned &start, unsigned &length)
 636 {
 637         bool found = false;
 638         bool member = false;
 639         bool subscript = false;
 640         for(const char *i=ptr;; ++i)
 641         {
 642                 if(!found)
 643                 {
 644                         if(!*i)
 645                                 return false;
 646                         if(isalpha(*i) || *i=='_')
 647                         {
 648                                 if(!member)
 649                                 {
 650                                         start = i-ptr;
 651                                         found = true;
 652                                 }
 653                         }
 654                         else if(*i=='.')
 655                                 member = true;
 656                         else
 657                                 member = false;
 658                 }
 659                 else
 660                 {
 661                         if(subscript)
 662                         {
 663                                 if(*i==']')
 664                                 {
 665                                         length = i+1-(ptr+start);
 666                                         return true;
 667                                 }
 668                                 else if(!isalpha(*i) || i>ptr+start+length+1)
 669                                         return true;
 670                         }
 671                         else if(!isalnum(*i) && *i!='_')
 672                         {
 673                                 length = i-(ptr+start);
 674                                 if(*i=='[')
 675                                         subscript = true;
 676                                 else
 677                                         return true;
 678                         }
 679                 }
 680         }
 681 }
 682
 683 vector<string> ProgramBuilder::extract_identifiers(const char *expression)
 684 {
 685         vector<string> result;
 686         const char *ptr = expression;
 687         unsigned start = 0;
 688         unsigned length = 0;
 689         while(parse_identifier(ptr, start, length))
 690         {
 691                 result.push_back(string(ptr+start, length));
 692                 ptr += start+length;
 693         }
 694         return result;
 695 }
 696
 697 string ProgramBuilder::replace_identifiers(const char *expression, const map<string, string> &replace_map, bool with_functions)
 698 {
 699         string result;
 700         const char *ptr = expression;
 701         unsigned start = 0;
 702         unsigned length = 0;
 703         while(parse_identifier(ptr, start, length))
 704         {
 705                 result.append(ptr, start);
 706                 string identifier(ptr+start, length);
 707                 map<string, string>::const_iterator i = replace_map.find(identifier);
 708                 if(i!=replace_map.end())
 709                 {
 710                         if(with_functions && ptr[start+length]=='(')
 711                         {
 712                                 string::size_type lparen = i->second.find('(');
 713                                 string::size_type rparen = i->second.rfind(')');
 714                                 if(lparen!=string::npos && rparen!=string::npos)
 715                                 {
 716                                         unsigned level = 1;
 717                                         unsigned j;
 718                                         for(j=start+length+1; (ptr[j] && level); ++j)
 719                                         {
 720                                                 level += (ptr[j]=='(');
 721                                                 level -= (ptr[j]==')');
 722                                         }
 723
 724                                         if(!level)
 725                                         {
 726                                                 string subexpr(ptr+start+length, ptr+j);
 727                                                 result += i->second.substr(0, lparen);
 728                                                 result += replace_identifiers(subexpr.c_str(), replace_map, with_functions);
 729                                                 result += i->second.substr(rparen+1);
 730                                                 ptr += j;
 731                                                 continue;
 732                                         }
 733                                 }
 734                         }
 735
 736                         result += i->second;
 737                 }
 738                 else
 739                         result += identifier;
 740                 ptr += start+length;
 741         }
 742         result += ptr;
 743         return result;
 744 }
 745
 746 string ProgramBuilder::create_expression(const ShaderVariable &var, const char *loop) const
 747 {
 748         string expr = var.create_expression(loop);
 749         return replace_identifiers(expr.c_str(), aliases, true);
 750 }
 751
 752
 753 ProgramBuilder::StandardFeatures::StandardFeatures():
 754         texture(false),
 755         material(false),
 756         lighting(false),
 757         max_lights(1),
 758         skylight(false),
 759         fog(false),
 760         specular(false),
 761         normalmap(false),
 762         shadow(false),
 763         reflection(false),
 764         clipping(false),
 765         max_clip_planes(1)
 766 {
 767         if(get_gl_api()==OPENGL_ES2)
 768                 legacy = !(get_glsl_version()>=Version(3, 0));
 769         else
 770                 legacy = !(get_glsl_version()>=Version(1, 30));
 771 }
 772
 773 string ProgramBuilder::StandardFeatures::create_flags() const
 774 {
 775         string flags;
 776         if(texture)
 777                 flags += 't';
 778         if(material)
 779                 flags += 'm';
 780         if(lighting)
 781         {
 782                 flags += 'l';
 783                 if(skylight)
 784                         flags += 'y';
 785                 if(specular)
 786                         flags += 'p';
 787                 if(normalmap)
 788                         flags += 'n';
 789         }
 790         if(fog)
 791                 flags += 'f';
 792         if(shadow)
 793                 flags += 's';
 794         if(reflection)
 795                 flags += 'e';
 796         if(clipping)
 797                 flags += 'c';
 798         if(legacy && get_gl_api()==OPENGL)
 799                 flags += 'g';
 800
 801         return flags;
 802 }
 803
 804
 805 ProgramBuilder::ShaderVariable::ShaderVariable(const std::string &n):
 806         name(n),
 807         variable(0),
 808         type(0),
 809         resolved_name(n),
 810         fuzzy_space(name.find("zzz")!=string::npos),
 811         array_sum(false),
 812         array_size(0),
 813         inlined(false),
 814         inline_parens(false),
 815         in_loop(false)
 816 {
 817         string::size_type bracket = name.find('[');
 818         if(bracket!=string::npos)
 819                 array_subscript = name.substr(bracket+1, name.size()-bracket-2);
 820 }
 821
 822 void ProgramBuilder::ShaderVariable::resolve(const VariableDefinition &var)
 823 {
 824         variable = &var;
 825         const char *space = 0;
 826         const char *var_uq_name = unqualified_name(variable->name);
 827         MatchType match = name_match(var_uq_name, resolved_name.c_str(), &space);
 828
 829         if(var_uq_name!=variable->name)
 830                 resolved_block.assign(variable->name, var_uq_name-2);
 831
 832         if(match==FUZZY)
 833                 resolve_space(string(space, 3));
 834         else if(match==ARRAY)
 835         {
 836                 if(array_subscript.empty())
 837                         array_sum = true;
 838                 else if(var.scope==UNIFORM)
 839                 {
 840                         const char *bracket = strrchr(variable->type, '[');
 841                         if(bracket)
 842                                 array_subscript = string(bracket+1, strlen(bracket)-2);
 843                 }
 844         }
 845 }
 846
 847 void ProgramBuilder::ShaderVariable::resolve(ShaderVariable &var)
 848 {
 849         for(list<ShaderVariable *>::iterator i=referenced_by.begin(); i!=referenced_by.end(); ++i)
 850                 (*i)->update_reference(*this, var);
 851         var.referenced_by.insert(var.referenced_by.end(), referenced_by.begin(), referenced_by.end());
 852 }
 853
 854 void ProgramBuilder::ShaderVariable::resolve_type(const VariableDefinition &var)
 855 {
 856         type = &var;
 857 }
 858
 859 void ProgramBuilder::ShaderVariable::resolve_space(const string &space)
 860 {
 861         if(fuzzy_space)
 862         {
 863                 resolved_space = space;
 864
 865                 string::size_type zzz = resolved_name.find("zzz");
 866                 resolved_name.replace(zzz, 3, resolved_space);
 867                 fuzzy_space = false;
 868
 869                 // Resolving the space could have affected other variables that use this one
 870                 for(list<ShaderVariable *>::iterator i=referenced_by.begin(); i!=referenced_by.end(); ++i)
 871                         (*i)->resolve_space(space);
 872         }
 873
 874         for(list<ShaderVariable *>::iterator i=referenced_vars.begin(); i!=referenced_vars.end(); ++i)
 875                 if((*i)->fuzzy_space)
 876                         (*i)->resolve_space(space);
 877 }
 878
 879 void ProgramBuilder::ShaderVariable::resolve_array(const StandardFeatures &features, unsigned size_hint)
 880 {
 881         if(array_size)
 882                 return;
 883         if(!array_sum && array_subscript.empty())
 884                 return;
 885
 886         if(!array_subscript.empty())
 887         {
 888                 string::size_type bracket = resolved_name.find('[');
 889                 if(bracket!=string::npos)
 890                         resolved_name = resolved_name.substr(0, bracket);
 891         }
 892
 893         if(variable && variable->scope==UNIFORM)
 894         {
 895                 if(array_subscript=="MAX_LIGHTS")
 896                         array_size = features.max_lights;
 897                 else if(array_subscript=="MAX_CLIP_PLANES")
 898                         array_size = features.max_clip_planes;
 899                 else if(isnumrc(array_subscript))
 900                         array_size = lexical_cast<unsigned>(array_subscript);
 901                 else
 902                         throw invalid_variable_definition("invalid array size");
 903         }
 904
 905         if(!array_size)
 906         {
 907                 for(list<ShaderVariable *>::const_iterator i=referenced_vars.begin(); i!=referenced_vars.end(); ++i)
 908                         if((*i)->array_size)
 909                         {
 910                                 array_size = (*i)->array_size;
 911                                 break;
 912                         }
 913         }
 914
 915         if(!array_size && size_hint)
 916                 array_size = size_hint;
 917
 918         if(array_size)
 919         {
 920                 for(list<ShaderVariable *>::const_iterator i=referenced_vars.begin(); i!=referenced_vars.end(); ++i)
 921                         if(!(*i)->array_subscript.empty() && !(*i)->array_size)
 922                                 (*i)->resolve_array(features, array_size);
 923         }
 924 }
 925
 926 void ProgramBuilder::ShaderVariable::add_reference(ShaderVariable &var)
 927 {
 928         referenced_vars.push_back(&var);
 929         var.referenced_by.push_back(this);
 930         if(var.fuzzy_space && !resolved_space.empty())
 931                 var.resolve_space(resolved_space);
 932 }
 933
 934 void ProgramBuilder::ShaderVariable::update_reference(ShaderVariable &from, ShaderVariable &to)
 935 {
 936         replace(referenced_vars.begin(), referenced_vars.end(), &from, &to);
 937         replace(referenced_by.begin(), referenced_by.end(), &from, &to);
 938         if(from.fuzzy_space && !to.fuzzy_space && !to.resolved_space.empty())
 939                 resolve_space(to.resolved_space);
 940 }
 941
 942 void ProgramBuilder::ShaderVariable::check_inline(bool allow_legacy, bool trivial_only)
 943 {
 944         if(variable->expression && variable->scope>=UNIFORM)
 945         {
 946                 if(array_sum && array_size>1)
 947                         return;
 948                 if(!allow_legacy && !strncmp(variable->expression, "gl_", 3))
 949                         return;
 950
 951                 // Never inline goal variables
 952                 if(referenced_by.empty())
 953                         return;
 954
 955                 // Inline an expression consisting of a single identifier
 956                 unsigned start, length;
 957                 if(parse_identifier(variable->expression, start, length))
 958                         if(start==0 && variable->expression[length]==0)
 959                         {
 960                                 inlined = true;
 961                                 return;
 962                         }
 963
 964                 if(trivial_only)
 965                         return;
 966
 967                 /* If all references to the variable come from arrays in the same scope
 968                 and of the same size, the variable can be embedded in the loop. */
 969                 in_loop = (array_size>1 && !array_sum);
 970                 for(list<ShaderVariable *>::const_iterator i=referenced_by.begin(); i!=referenced_by.end(); ++i)
 971                         if((*i)->variable->scope!=variable->scope || (*i)->array_size!=array_size)
 972                                 in_loop = false;
 973
 974                 /* Count all refs to this variable.  Refs from array variables count once
 975                 per loop iteration. */
 976                 unsigned total_refs = 0;
 977                 unsigned in_scope_refs = 0;
 978                 for(list<ShaderVariable *>::const_iterator i=referenced_by.begin(); i!=referenced_by.end(); ++i)
 979                 {
 980                         unsigned count = max((*i)->array_size*!in_loop, 1U);
 981                         total_refs += count;
 982                         if((*i)->variable->scope==variable->scope)
 983                                 in_scope_refs += count;
 984                 }
 985
 986                 /* Inline if there's only one ref, or if all refs are in other scopes.
 987                 In the latter case, the actual inlining will happen in the interface
 988                 variable assignment. */
 989                 if(total_refs==1 || in_scope_refs==0)
 990                 {
 991                         inlined = true;
 992                         unsigned level = 0;
 993                         for(const char *c=variable->expression; (!inline_parens && *c); ++c)
 994                         {
 995                                 if(*c=='(')
 996                                         ++level;
 997                                 else if(*c==')')
 998                                         --level;
 999                                 else if(level==0 && !isalnum(*c) && *c!='_' && *c!='.')
1000                                         inline_parens = true;
1001                         }
1002                 }
1003         }
1004 }
1005
1006 bool ProgramBuilder::ShaderVariable::is_referenced_from(VariableScope scope) const
1007 {
1008         for(list<ShaderVariable *>::const_iterator i=referenced_by.begin(); i!=referenced_by.end(); ++i)
1009                 if((*i)->variable->scope==scope)
1010                         return true;
1011         return false;
1012 }
1013
1014 ProgramBuilder::InterfaceFlags ProgramBuilder::ShaderVariable::get_interface_flags(VariableScope scope) const
1015 {
1016         /* Uniforms are available to all stages and are not passed through
1017         interfaces */
1018         if(variable->scope<=UNIFORM)
1019                 return NO_INTERFACE;
1020
1021         int flags = NO_INTERFACE;
1022
1023         for(list<ShaderVariable *>::const_iterator i=referenced_by.begin(); i!=referenced_by.end(); ++i)
1024         {
1025                 /* Variables used in a later scope than they are declared in need to go
1026                 through the interface */
1027                 if((*i)->variable->scope>scope && variable->scope<=scope)
1028                         flags |= OUTPUT;
1029                 if((*i)->variable->scope>=scope && variable->scope<scope)
1030                         if(!inlined || variable->scope!=ATTRIBUTE || scope!=VERTEX)
1031                                 flags |= INPUT;
1032         }
1033
1034         // Variables without any references are goals and also outputs.
1035         if(referenced_by.empty() && variable->scope==scope)
1036                 flags |= OUTPUT|GOAL;
1037
1038         return static_cast<InterfaceFlags>(flags);
1039 }
1040
1041 string ProgramBuilder::ShaderVariable::create_type_declaration() const
1042 {
1043         if(!type)
1044                 throw logic_error("no type");
1045
1046         if(!strncmp(type->type, "struct", 6))
1047         {
1048                 const char *brace = strchr(type->type, '{');
1049                 if(brace)
1050                         return format("struct %s %s", type->name, brace);
1051         }
1052
1053         throw invalid_variable_definition("invalid typedef");
1054 }
1055
1056 string ProgramBuilder::ShaderVariable::create_declaration(char iface, bool loop) const
1057 {
1058         if(variable->scope==FUNCTION)
1059                 return format("%s %s(%s)", variable->type, resolved_name, variable->expression);
1060
1061         if(variable->scope==UNIFORM && !array_subscript.empty())
1062         {
1063                 const char *bracket = strrchr(variable->type, '[');
1064                 if(bracket)
1065                         return format("%s %s[%d]", string(variable->type, bracket), resolved_name, array_size);
1066         }
1067
1068         string array;
1069         if(!array_sum && array_size>1 && !loop)
1070                 array = format("[%d]", array_size);
1071
1072         if(iface)
1073                 return format("%s %c_%s%s", variable->type, iface, resolved_name, array);
1074         else
1075                 return format("%s %s%s", variable->type, resolved_name, array);
1076 }
1077
1078 string ProgramBuilder::ShaderVariable::create_replacement(VariableScope from_scope, const char *loop) const
1079 {
1080         string replacement = resolved_name;
1081         InterfaceFlags iface = NO_INTERFACE;
1082         if(variable)
1083         {
1084                 iface = get_interface_flags(from_scope);
1085                 if((iface&INPUT) && interfaces[from_scope-1])
1086                         replacement = format("%c_%s", interfaces[from_scope-1], replacement);
1087                 else if(inlined)
1088                 {
1089                         replacement = create_expression(loop);
1090                         if(inline_parens)
1091                                 replacement = "("+replacement+")";
1092                         return replacement;
1093                 }
1094         }
1095
1096         // Add an array subscript, unless the variable is embedded in a loop
1097         if(!array_subscript.empty() && !in_loop)
1098         {
1099                 if(loop)
1100                         return format("%s[%s]", replacement, loop);
1101                 else if(!variable || variable->scope==UNIFORM)
1102                         return replacement+"[0]";
1103         }
1104
1105         return replacement;
1106 }
1107
1108 string ProgramBuilder::ShaderVariable::create_expression(const char *loop) const
1109 {
1110         map<string, string> replace_map;
1111         for(list<ShaderVariable *>::const_iterator i=referenced_vars.begin(); i!=referenced_vars.end(); ++i)
1112         {
1113                 string replacement = (*i)->create_replacement(variable->scope, loop);
1114                 if(replacement!=(*i)->name)
1115                         replace_map[(*i)->name] = replacement;
1116         }
1117
1118         if(replace_map.empty())
1119                 return variable->expression;
1120         else
1121                 return replace_identifiers(variable->expression, replace_map);
1122 }
1123
1124
1125 ProgramBuilder::StandardFeatures::Loader::Loader(StandardFeatures &f):
1126         DataFile::ObjectLoader<StandardFeatures>(f)
1127 {
1128         add("clipping",  &StandardFeatures::clipping);
1129         add("custom",    &StandardFeatures::custom);
1130         add("fog",       &StandardFeatures::fog);
1131         add("lighting",  &StandardFeatures::lighting);
1132         add("material",  &StandardFeatures::material);
1133         add("max_clip_planes", &StandardFeatures::max_clip_planes);
1134         add("max_lights", &StandardFeatures::max_lights);
1135         add("normalmap", &StandardFeatures::normalmap);
1136         add("reflection", &StandardFeatures::reflection);
1137         add("shadow",    &StandardFeatures::shadow);
1138         add("skylight",  &StandardFeatures::skylight);
1139         add("specular",  &StandardFeatures::specular);
1140         add("texture",   &StandardFeatures::texture);
1141 }
1142
1143 } // namespace GL
1144 } // namespace Msp