source/programbuilder.cpp

   1 #include <algorithm>
   2 #include <cstring>
   3 #include <msp/strings/format.h>
   4 #include "extension.h"
   5 #include "program.h"
   6 #include "programbuilder.h"
   7 #include "shader.h"
   8 #include "vertexformat.h"
   9
  10 using namespace std;
  11
  12 namespace Msp {
  13 namespace GL {
  14
  15 /*
  16 Naming conventions:
  17   n_*        Normalized vector
  18   l_*        Lighting component
  19
  20   obj_*      Object space
  21   eye_*      Eye space
  22   tbn_*      Tangent-Binormal-Normal space
  23   shd_*      Shadow space
  24   env_*      Environment space
  25   *_dir      Direction vector
  26
  27   zzz_*      Wildcard space, resolved by the builder
  28              All wildcard spaces within an expression must match
  29
  30   xxx_yyy_*  Matrix that transforms between yyy to xxx
  31              The vector is on the side of its designated space, result will be
  32              in the other space
  33   *_matrix   A matrix (duh)
  34   *_rmatrix  A mat4 that works with a row vector
  35
  36   rgb_*      Color with rgb components only
  37   color_*    Color with rgba components
  38 */
  39
  40 /* The array are stored in reverse order, so that variables always come after
  41 anything that might need them. */
  42 const ProgramBuilder::VariableDefinition ProgramBuilder::standard_variables[] =
  43 {
  44         { FRAGMENT, "gl_FragColor", 0, "frag_color", "g" },
  45         { FRAGMENT, "frag_color", 0, "color_base", "!t" },
  46         { FRAGMENT, "frag_color", 0, "tex_sample", "!l!s!mt" },
  47         { FRAGMENT, "frag_color", 0, "tex_sample*color_base", "l|s|mt" },
  48         { FRAGMENT, "color_base", "vec4", "vec4(1.0)", "!l!s!m" },
  49         { FRAGMENT, "color_base", "vec4", "color", "!l!sm" },
  50         { FRAGMENT, "color_base", "vec4", "vec4(vec3(l_shadow), 1.0)", "!ls!m" },
  51         { FRAGMENT, "color_base", "vec4", "color*vec4(vec3(l_shadow), 1.0)", "!lsm" },
  52         { FRAGMENT, "color_base", "vec4", "vec4(rgb_light_env, 1.0)", "l!m" },
  53         { FRAGMENT, "color_base", "vec4", "vec4(rgb_light_env, material.diffuse.a)", "lm" },
  54         { FRAGMENT, "rgb_light_env", "vec3", "rgb_light_full+reflect_sample.rgb*reflectivity", "e" },
  55         { FRAGMENT, "rgb_light_env", "vec3", "rgb_light_full", "!e" },
  56         { FRAGMENT, "rgb_light_full", "vec3", "rgb_light_shadow+ambient_product_diffuse.rgb", "m" },
  57         { FRAGMENT, "ambient_product_diffuse", "vec4", "gl_FrontLightModelProduct.sceneColor", "g" },
  58         { FRAGMENT, "ambient_product_diffuse", "vec4", "ambient_color*material.diffuse", "!g" },
  59         { FRAGMENT, "rgb_light_full", "vec3", "rgb_light_shadow", "!m" },
  60         { FRAGMENT, "rgb_light_shadow", "vec3", "rgb_light*l_shadow", "s" },
  61         { FRAGMENT, "rgb_light_shadow", "vec3", "rgb_light", "!s" },
  62         { FRAGMENT, "rgb_light", "vec3", "vec3(l_diffuse)", "!m!p" },
  63         { FRAGMENT, "rgb_light", "vec3", "vec3(l_diffuse+l_specular)", "!mp" },
  64         { FRAGMENT, "rgb_light", "vec3", "l_diffuse*light_product_diffuse.rgb", "m!p" },
  65         { FRAGMENT, "rgb_light", "vec3", "l_diffuse*light_product_diffuse.rgb+l_specular*light_product_specular.rgb", "mp" },
  66         { FRAGMENT, "light_product_diffuse", "vec4", "gl_FrontLightProduct[0].diffuse", "g" },
  67         { FRAGMENT, "light_product_diffuse", "vec4", "light_sources[0].diffuse*material.diffuse", "!g" },
  68         { FRAGMENT, "light_product_specular", "vec4", "gl_FrontLightProduct[0].specular", "g" },
  69         { FRAGMENT, "light_product_specular", "vec4", "light_sources[0].specular*material.specular", "!g" },
  70         { FRAGMENT, "reflect_sample", "vec4", "textureCube(environment, env_reflect_dir)", 0 },
  71         { FRAGMENT, "env_reflect_dir", "vec3", "env_eye_matrix*eye_reflect_dir", 0 },
  72         { FRAGMENT, "eye_reflect_dir", "vec3", "eye_tbn_matrix*tbn_reflect_dir", "n" },
  73         { FRAGMENT, "zzz_reflect_dir", "vec3", "reflect(zzz_incident_dir, n_zzz_normal)", 0 },
  74         { FRAGMENT, "l_shadow", "float", "mix(1.0, shadow_sample, shadow_darkness)", 0 },
  75         { FRAGMENT, "shadow_sample", "float", "shadow2D(shadow, shd_vertex).r", 0 },
  76         { FRAGMENT, "l_diffuse", "float", "max(dot(n_zzz_normal, n_zzz_light_dir), 0.0)", 0 },
  77         { FRAGMENT, "l_specular", "float", "pow(max(dot(n_zzz_half_vec, n_zzz_normal), 0.0), material.shininess)", 0 },
  78         { FRAGMENT, "n_zzz_half_vec", "vec3", "normalize(zzz_light_dir-zzz_incident_dir)", 0 },
  79         { FRAGMENT, "n_zzz_light_dir", "vec3", "normalize(zzz_light_dir)", 0 },
  80         { FRAGMENT, "n_tbn_normal", "vec3", "normal_sample*2.0-1.0", "n" },
  81         { FRAGMENT, "n_eye_normal", "vec3", "normalize(eye_normal)", "!n" },
  82         { FRAGMENT, "normal_sample", "vec3", "texture2D(normalmap, texture_coord).xyz", 0 },
  83         { FRAGMENT, "tex_sample", "vec4", "texture2D(texture, texture_coord)", 0 },
  84
  85         { VERTEX, "gl_Position", 0, "projection_matrix*eye_vertex", 0 },
  86         { VERTEX, "shd_vertex", "vec3", "vec3(dot(eye_vertex, gl_EyePlaneS[shadow_unit]), dot(eye_vertex, gl_EyePlaneT[shadow_unit]), dot(eye_vertex, gl_EyePlaneR[shadow_unit]))", "g" },
  87         { VERTEX, "shd_vertex", "vec3", "(shd_eye_matrix*eye_vertex).xyz", "!g" },
  88         { VERTEX, "tbn_light_dir", "vec3", "eye_light_dir*eye_tbn_matrix", 0 },
  89         { VERTEX, "eye_light_dir", "vec3", "normalize(eye_light_position.xyz-eye_vertex.xyz*eye_light_position.w)", 0 },
  90         { VERTEX, "eye_light_position", "vec4", "light_sources[0].position", 0 },
  91         { VERTEX, "tbn_incident_dir", "vec3", "eye_incident_dir*eye_tbn_matrix", 0 },
  92         { VERTEX, "eye_incident_dir", "vec3", "normalize(eye_vertex.xyz)", 0 },
  93         { VERTEX, "eye_tbn_matrix", "mat3", "mat3(eye_tangent, eye_binormal, eye_normal)", 0 },
  94         { VERTEX, "eye_vertex", "vec4", "eye_obj_matrix*vertex", 0 },
  95         { VERTEX, "eye_normal", "vec3", "eye_obj_normal_matrix*normal", 0 },
  96         { VERTEX, "eye_tangent", "vec3", "eye_obj_normal_matrix*tangent", 0 },
  97         { VERTEX, "eye_binormal", "vec3", "eye_obj_normal_matrix*binormal", 0 },
  98         { VERTEX, "texture_coord", "vec2", "texcoord.xy", 0 },
  99
 100         { ATTRIBUTE, "vertex", "vec4", "gl_Vertex", 0 },
 101         { ATTRIBUTE, "texcoord", "vec4", "gl_MultiTexCoord0", 0 },
 102         { ATTRIBUTE, "color", "vec4", "gl_Color", 0 },
 103         { ATTRIBUTE, "normal", "vec3", "gl_Normal", 0 },
 104         { ATTRIBUTE, "tangent", "vec3", 0, 0 },
 105         { ATTRIBUTE, "binormal", "vec3", 0, 0 },
 106
 107         { UNIFORM, "shadow_unit", "int", 0, 0 },
 108         { UNIFORM, "texture", "sampler2D", 0, 0 },
 109         { UNIFORM, "shadow", "sampler2DShadow", 0, 0 },
 110         { UNIFORM, "shadow_darkness", "float", 0, 0 },
 111         { UNIFORM, "normalmap", "sampler2D", 0, 0 },
 112         { UNIFORM, "environment", "samplerCube", 0, 0 },
 113         { UNIFORM, "env_eye_matrix", "mat3", 0, 0 },
 114         { UNIFORM, "reflectivity", "float", 0, 0 },
 115         { UNIFORM, "eye_obj_matrix", "mat4", "gl_ModelViewMatrix", 0 },
 116         { UNIFORM, "eye_obj_normal_matrix", "mat3", "gl_NormalMatrix", 0 },
 117         { UNIFORM, "projection_matrix", "mat4", "gl_ProjectionMatrix", 0 },
 118         { UNIFORM, "shd_eye_matrix", "mat4", 0, "!g" },
 119         { UNIFORM, "light_sources", "struct { vec4 position; vec4 diffuse; vec4 specular; } %s[2]", "gl_LightSource", 0 },
 120         { UNIFORM, "ambient_color", "vec4", 0, 0 },
 121         { UNIFORM, "material", "struct { vec4 ambient; vec4 diffuse; vec4 specular; float shininess; }", "gl_FrontMaterial", 0 },
 122
 123         // Terminator entry
 124         { NO_SCOPE,  0, 0, 0, 0 }
 125 };
 126
 127 ProgramBuilder::ProgramBuilder(const StandardFeatures &f):
 128         features(f),
 129         feature_flags(features.create_flags()),
 130         optimize(true)
 131 {
 132         if(!features.custom.empty())
 133         {
 134                 const char *whitespace = " \t\n";
 135                 string::size_type start = 0;
 136                 while(1)
 137                 {
 138                         start = features.custom.find_first_not_of(whitespace, start);
 139                         if(start==string::npos)
 140                                 break;
 141
 142                         string::size_type semicolon = features.custom.find(';', start);
 143                         if(semicolon==start)
 144                         {
 145                                 ++start;
 146                                 continue;
 147                         }
 148                         else if(semicolon==string::npos)
 149                                 throw invalid_variable_definition(features.custom.substr(start));
 150
 151                         string::size_type equals = features.custom.find('=', start);
 152                         if(equals>semicolon)
 153                                 equals = string::npos;
 154
 155                         VariableDefinition var;
 156                         string::size_type decl_end = min(equals, semicolon);
 157                         for(unsigned i=0;; ++i)
 158                         {
 159                                 string::size_type word_end = features.custom.find_first_of(whitespace, start);
 160                                 word_end = min(word_end, decl_end);
 161                                 features.custom[word_end] = 0;
 162
 163                                 const char *word = &features.custom[start];
 164                                 if(i==0)
 165                                 {
 166                                         if(!strcmp(word, "uniform"))
 167                                                 var.scope = UNIFORM;
 168                                         else if(!strcmp(word, "attribute"))
 169                                                 var.scope = ATTRIBUTE;
 170                                         else if(!strcmp(word, "vertex"))
 171                                                 var.scope = VERTEX;
 172                                         else if(!strcmp(word, "fragment"))
 173                                                 var.scope = FRAGMENT;
 174                                         else
 175                                                 throw invalid_variable_definition(word);
 176                                 }
 177                                 else if(i==1)
 178                                         var.type = word;
 179                                 else if(i==2)
 180                                         var.name = word;
 181
 182                                 start = features.custom.find_first_not_of(whitespace, word_end+1);
 183                                 if(start>=decl_end)
 184                                         break;
 185                         }
 186
 187                         if(equals!=string::npos)
 188                         {
 189                                 start = features.custom.find_first_not_of(whitespace, equals+1);
 190                                 if(start>=semicolon)
 191                                         throw invalid_variable_definition("no expression");
 192                                 features.custom[semicolon] = 0;
 193                                 var.expression = &features.custom[start];
 194                         }
 195                         else
 196                                 var.expression = 0;
 197
 198                         var.flags = 0;
 199                         for(const VariableDefinition *j=standard_variables; j->name; ++j)
 200                                 if(!strcmp(var.name, j->name))
 201                                         var.flags = "o";
 202
 203                         custom_variables.push_front(var);
 204
 205                         start = semicolon+1;
 206                 }
 207         }
 208 }
 209
 210 void ProgramBuilder::set_optimize(bool o)
 211 {
 212         optimize = o;
 213 }
 214
 215 Program *ProgramBuilder::create_program() const
 216 {
 217         Program *prog = new Program;
 218         add_shaders(*prog);
 219         return prog;
 220 }
 221
 222 void ProgramBuilder::add_shaders(Program &prog) const
 223 {
 224         list<ShaderVariable> variables;
 225         list<ShaderVariable *> resolved_vars;
 226
 227         variables.push_front(ShaderVariable("gl_Position"));
 228         variables.push_front(ShaderVariable(features.legacy ? "gl_FragColor" : "frag_color"));
 229
 230         list<VariableDefinition>::const_iterator next_custom = custom_variables.begin();
 231         for(const VariableDefinition *i=standard_variables; i->name; )
 232         {
 233                 const VariableDefinition *def = 0;
 234                 if(next_custom!=custom_variables.end() && (!strcmp(next_custom->name, i->name) || !next_custom->flags))
 235                 {
 236                         def = &*next_custom;
 237                         ++next_custom;
 238                 }
 239                 else
 240                 {
 241                         def = i;
 242                         ++i;
 243
 244                         // Skip over anything that isn't used with the supplied flags
 245                         if(def->flags && !evaluate_flags(def->flags))
 246                                 continue;
 247                 }
 248
 249                 // See if this variable can satisfy any unresolved variables
 250                 ShaderVariable *last_resolved = 0;
 251                 for(list<ShaderVariable>::iterator j=variables.begin(); j!=variables.end(); ++j)
 252                 {
 253                         if(j->variable)
 254                                 continue;
 255
 256                         if(!name_match(def->name, j->resolved_name.c_str()))
 257                                 continue;
 258
 259                         if(last_resolved)
 260                         {
 261                                 /* We've already resolved a non-fuzzy variable in this iteration.
 262                                 If there are multiple variables that can be resolved, they refer
 263                                 to the same variable. */
 264                                 j->resolve(*last_resolved);
 265                                 continue;
 266                         }
 267
 268                         j->resolve(*def);
 269                         resolved_vars.push_front(&*j);
 270                         if(!j->fuzzy_space)
 271                                 last_resolved = &*j;
 272
 273                         if(!def->expression)
 274                                 continue;
 275
 276                         vector<string> identifiers = extract_identifiers(def->expression);
 277                         for(vector<string>::const_iterator k=identifiers.begin(); k!=identifiers.end(); ++k)
 278                         {
 279                                 // Use an existing variable if possible, but only if it's not fuzzy
 280                                 ShaderVariable *var = 0;
 281                                 for(list<ShaderVariable>::iterator l=variables.begin(); (!var && l!=variables.end()); ++l)
 282                                         if(!l->fuzzy_space && l->resolved_name==*k)
 283                                                 var = &*l;
 284
 285                                 if(!var)
 286                                 {
 287                                         variables.push_back(ShaderVariable(*k));
 288                                         var = &variables.back();
 289                                 }
 290                                 j->add_reference(*var);
 291                         }
 292                 }
 293         }
 294
 295         if(optimize)
 296         {
 297                 for(list<ShaderVariable *>::const_iterator i=resolved_vars.begin(); i!=resolved_vars.end(); ++i)
 298                         (*i)->check_inline(features.legacy);
 299         }
 300
 301         prog.attach_shader_owned(new VertexShader(create_source(resolved_vars, VERTEX)));
 302         prog.attach_shader_owned(new FragmentShader(create_source(resolved_vars, FRAGMENT)));
 303
 304         if(!features.legacy)
 305         {
 306                 prog.bind_fragment_data(0, "frag_color");
 307                 prog.bind_attribute(VERTEX4, "vertex");
 308                 if(features.lighting)
 309                         prog.bind_attribute(NORMAL3, "normal");
 310                 else if(features.material)
 311                         prog.bind_attribute(COLOR4_FLOAT, "color");
 312                 if(features.texture || features.normalmap)
 313                         prog.bind_attribute(TEXCOORD4, "texcoord");
 314         }
 315         if(features.normalmap)
 316         {
 317                 prog.bind_attribute(get_component_type(TANGENT3), "tangent");
 318                 prog.bind_attribute(get_component_type(BINORMAL3), "binormal");
 319         }
 320 }
 321
 322 string ProgramBuilder::create_source(const list<ShaderVariable *> &variables, VariableScope scope) const
 323 {
 324         string source;
 325
 326         if(!features.legacy)
 327                 source += "#version 130\n";
 328
 329         for(list<ShaderVariable *>::const_iterator i=variables.begin(); i!=variables.end(); ++i)
 330                 if((*i)->variable->scope==UNIFORM && (*i)->is_referenced_from(scope) && !(*i)->inlined)
 331                 {
 332                         if(strchr((*i)->variable->type, '%'))
 333                                 source += format("uniform %s;\n", format((*i)->variable->type, (*i)->resolved_name));
 334                         else
 335                                 source += format("uniform %s %s;\n", (*i)->variable->type, (*i)->resolved_name);
 336                 }
 337
 338         if(scope==VERTEX)
 339         {
 340                 const char *qualifier = (features.legacy ? "attribute" : "in");
 341                 for(list<ShaderVariable *>::const_iterator i=variables.begin(); i!=variables.end(); ++i)
 342                         if((*i)->variable->scope==ATTRIBUTE && !(*i)->inlined)
 343                                 source += format("%s %s %s;\n", qualifier, (*i)->variable->type, (*i)->resolved_name);
 344         }
 345
 346         /* Any variables defined in vertex scope but referenced from fragment scope
 347         should be exported as varyings over the interface. */
 348         list<ShaderVariable *> varyings;
 349         for(list<ShaderVariable *>::const_iterator i=variables.begin(); i!=variables.end(); ++i)
 350                 if(((*i)->variable->scope==VERTEX || (*i)->variable->scope==ATTRIBUTE) && (*i)->is_referenced_from(FRAGMENT))
 351                 {
 352                         varyings.push_back(*i);
 353                         const char *qualifier;
 354                         if(!features.legacy)
 355                                 qualifier = (scope==VERTEX ? "out" : "in");
 356                         else
 357                                 qualifier = "varying";
 358                         source += format("%s %s v_%s;\n", qualifier, (*i)->variable->type, (*i)->resolved_name);
 359                 }
 360
 361         if(scope==FRAGMENT && !features.legacy)
 362                 source += "out vec4 frag_color;\n";
 363
 364         source += "void main()\n{\n";
 365
 366         for(list<ShaderVariable *>::const_iterator i=variables.begin(); i!=variables.end(); ++i)
 367                 if((*i)->variable->scope==scope && !(*i)->inlined)
 368                 {
 369                         source += '\t';
 370                         if((*i)->variable->type)
 371                         {
 372                                 source += (*i)->variable->type;
 373                                 source += ' ';
 374                         }
 375                         source += format("%s = %s;\n", (*i)->resolved_name, (*i)->get_expression());
 376                 }
 377
 378         if(scope==VERTEX)
 379         {
 380                 for(list<ShaderVariable *>::const_iterator i=varyings.begin(); i!=varyings.end(); ++i)
 381                 {
 382                         if((*i)->inlined)
 383                                 source += format("\tv_%s = %s;\n", (*i)->resolved_name, (*i)->get_expression());
 384                         else
 385                                 source += format("\tv_%s = %s;\n", (*i)->resolved_name, (*i)->resolved_name);
 386                 }
 387         }
 388
 389         source += '}';
 390
 391         return source;
 392 }
 393
 394 bool ProgramBuilder::evaluate_flags(const char *flags) const
 395 {
 396         if(!flags)
 397                 return true;
 398
 399         bool cond = true;
 400         char oper = '&';
 401         for(const char *i=flags; *i; ++i)
 402         {
 403                 if(*i>='a' && *i<='z')
 404                 {
 405                         bool found = (feature_flags.find(*i)!=string::npos);
 406                         if(oper=='|')
 407                                 cond = (cond || found);
 408                         else if(oper=='!')
 409                                 cond = (cond && !found);
 410                         else if(oper=='&')
 411                                 cond = (cond && found);
 412                         oper = '&';
 413                 }
 414                 else
 415                         oper = *i;
 416         }
 417
 418         return cond;
 419 }
 420
 421 ProgramBuilder::MatchLevel ProgramBuilder::name_match(const char *n1, const char *n2, const char **space)
 422 {
 423         int i = 0;
 424         int zzz = -1;
 425         int zside = 0;
 426         while(*n1 && *n2)
 427         {
 428                 if(*n1==*n2 || *n1=='z' || *n2=='z')
 429                 {
 430                         if(*n1!=*n2)
 431                         {
 432                                 int side = (*n1=='z' ? 1 : 2);
 433                                 if(zzz<0)
 434                                 {
 435                                         zzz = i;
 436                                         zside = side;
 437                                         if(space)
 438                                         {
 439                                                 if(*n1=='z')
 440                                                         *space = n2;
 441                                                 else
 442                                                         *space = n1;
 443                                         }
 444                                 }
 445                                 else if(i>=zzz+3 || side!=zside)
 446                                         return NO_MATCH;
 447                         }
 448                 }
 449                 else
 450                         return NO_MATCH;
 451                 ++n1;
 452                 ++n2;
 453                 ++i;
 454         }
 455         return (!*n1 && !*n2) ? zzz>=0 ? FUZZY : EXACT : NO_MATCH;
 456 }
 457
 458 bool ProgramBuilder::parse_identifier(const char *ptr, unsigned &start, unsigned &length)
 459 {
 460         bool found = false;
 461         bool member = false;
 462         for(const char *i=ptr;; ++i)
 463         {
 464                 if(!found)
 465                 {
 466                         if(!*i)
 467                                 return false;
 468                         if(isalpha(*i) || *i=='_')
 469                         {
 470                                 if(!member)
 471                                 {
 472                                         start = i-ptr;
 473                                         found = true;
 474                                 }
 475                         }
 476                         else if(*i=='.')
 477                                 member = true;
 478                         else
 479                                 member = false;
 480                 }
 481                 else
 482                 {
 483                         if(!isalnum(*i) && *i!='_')
 484                         {
 485                                 length = i-(ptr+start);
 486                                 return true;
 487                         }
 488                 }
 489         }
 490 }
 491
 492 vector<string> ProgramBuilder::extract_identifiers(const char *expression)
 493 {
 494         vector<string> result;
 495         const char *ptr = expression;
 496         unsigned start = 0;
 497         unsigned length = 0;
 498         while(parse_identifier(ptr, start, length))
 499         {
 500                 result.push_back(string(ptr+start, length));
 501                 ptr += start+length;
 502         }
 503         return result;
 504 }
 505
 506 string ProgramBuilder::replace_identifiers(const char *expression, const map<string, string> &replace_map)
 507 {
 508         string result;
 509         const char *ptr = expression;
 510         unsigned start = 0;
 511         unsigned length = 0;
 512         while(parse_identifier(ptr, start, length))
 513         {
 514                 result.append(ptr, start);
 515                 string identifier(ptr+start, length);
 516                 map<string, string>::const_iterator i = replace_map.find(identifier);
 517                 if(i!=replace_map.end())
 518                         result += i->second;
 519                 else
 520                         result += identifier;
 521                 ptr += start+length;
 522         }
 523         result += ptr;
 524         return result;
 525 }
 526
 527
 528 ProgramBuilder::StandardFeatures::StandardFeatures():
 529         texture(false),
 530         material(false),
 531         lighting(false),
 532         specular(false),
 533         normalmap(false),
 534         shadow(false),
 535         reflection(false),
 536         legacy(!(get_glsl_version()>=Version(1, 30)))
 537 { }
 538
 539 string ProgramBuilder::StandardFeatures::create_flags() const
 540 {
 541         string flags;
 542         if(texture)
 543                 flags += 't';
 544         if(material)
 545                 flags += 'm';
 546         if(lighting)
 547         {
 548                 flags += 'l';
 549                 if(specular)
 550                         flags += 'p';
 551                 if(normalmap)
 552                         flags += 'n';
 553         }
 554         if(shadow)
 555                 flags += 's';
 556         if(reflection)
 557                 flags += 'e';
 558         if(legacy)
 559                 flags += 'g';
 560
 561         return flags;
 562 }
 563
 564
 565 ProgramBuilder::ShaderVariable::ShaderVariable(const std::string &n):
 566         name(n),
 567         variable(0),
 568         resolved_name(n),
 569         fuzzy_space(name.find("zzz")!=string::npos),
 570         inlined(false),
 571         inline_parens(false)
 572 { }
 573
 574 void ProgramBuilder::ShaderVariable::resolve(const VariableDefinition &var)
 575 {
 576         variable = &var;
 577         const char *space = 0;
 578         if(name_match(var.name, resolved_name.c_str(), &space)==FUZZY)
 579                 resolve_space(string(space, 3));
 580 }
 581
 582 void ProgramBuilder::ShaderVariable::resolve(ShaderVariable &var)
 583 {
 584         for(list<ShaderVariable *>::iterator i=referenced_by.begin(); i!=referenced_by.end(); ++i)
 585                 (*i)->update_reference(*this, var);
 586         var.referenced_by.insert(var.referenced_by.end(), referenced_by.begin(), referenced_by.end());
 587 }
 588
 589 void ProgramBuilder::ShaderVariable::resolve_space(const string &space)
 590 {
 591         if(fuzzy_space)
 592         {
 593                 resolved_space = space;
 594
 595                 string::size_type zzz = resolved_name.find("zzz");
 596                 resolved_name.replace(zzz, 3, resolved_space);
 597                 fuzzy_space = false;
 598
 599                 // Resolving the space could have affected other variables that use this one
 600                 for(list<ShaderVariable *>::iterator i=referenced_by.begin(); i!=referenced_by.end(); ++i)
 601                         (*i)->resolve_space(space);
 602         }
 603
 604         for(list<ShaderVariable *>::iterator i=referenced_vars.begin(); i!=referenced_vars.end(); ++i)
 605                 if((*i)->fuzzy_space)
 606                         (*i)->resolve_space(space);
 607 }
 608
 609 void ProgramBuilder::ShaderVariable::add_reference(ShaderVariable &var)
 610 {
 611         referenced_vars.push_back(&var);
 612         var.referenced_by.push_back(this);
 613         if(var.fuzzy_space && !resolved_space.empty())
 614                 var.resolve_space(resolved_space);
 615 }
 616
 617 void ProgramBuilder::ShaderVariable::update_reference(ShaderVariable &from, ShaderVariable &to)
 618 {
 619         replace(referenced_vars.begin(), referenced_vars.end(), &from, &to);
 620         replace(referenced_by.begin(), referenced_by.end(), &from, &to);
 621         if(from.fuzzy_space && !to.fuzzy_space && !to.resolved_space.empty())
 622                 resolve_space(to.resolved_space);
 623 }
 624
 625 void ProgramBuilder::ShaderVariable::check_inline(bool allow_legacy)
 626 {
 627         if(variable->expression)
 628         {
 629                 if(!allow_legacy && !strncmp(variable->expression, "gl_", 3))
 630                         return;
 631
 632                 unsigned total_refs = referenced_by.size();
 633                 unsigned in_scope_refs = 0;
 634                 for(list<ShaderVariable *>::const_iterator i=referenced_by.begin(); i!=referenced_by.end(); ++i)
 635                         if((*i)->variable->scope==variable->scope)
 636                                 ++in_scope_refs;
 637                 if(total_refs==1 || (total_refs>0 && in_scope_refs==0))
 638                 {
 639                         inlined = true;
 640                         unsigned level = 0;
 641                         for(const char *c=variable->expression; (!inline_parens && *c); ++c)
 642                         {
 643                                 if(*c=='(')
 644                                         ++level;
 645                                 else if(*c==')')
 646                                         --level;
 647                                 else if(level==0 && !isalnum(*c) && *c!='_' && *c!='.')
 648                                         inline_parens = true;
 649                         }
 650                 }
 651         }
 652 }
 653
 654 bool ProgramBuilder::ShaderVariable::is_referenced_from(VariableScope scope) const
 655 {
 656         for(list<ShaderVariable *>::const_iterator i=referenced_by.begin(); i!=referenced_by.end(); ++i)
 657                 if((*i)->variable->scope==scope)
 658                         return true;
 659         return false;
 660 }
 661
 662 string ProgramBuilder::ShaderVariable::get_expression() const
 663 {
 664         map<string, string> replace_map;
 665         for(list<ShaderVariable *>::const_iterator i=referenced_vars.begin(); i!=referenced_vars.end(); ++i)
 666                 if((*i)->variable)
 667                 {
 668                         string replacement = (*i)->resolved_name;
 669                         if(variable->scope==FRAGMENT && ((*i)->variable->scope==VERTEX || (*i)->variable->scope==ATTRIBUTE))
 670                                 replacement = "v_"+replacement;
 671                         else if((*i)->inlined)
 672                         {
 673                                 replacement = (*i)->get_expression();
 674                                 if((*i)->inline_parens)
 675                                         replacement = "("+replacement+")";
 676                         }
 677                         if(replacement!=(*i)->name)
 678                                 replace_map[(*i)->name] = replacement;
 679                 }
 680
 681         if(replace_map.empty())
 682                 return variable->expression;
 683         else
 684                 return replace_identifiers(variable->expression, replace_map);
 685 }
 686
 687
 688 ProgramBuilder::StandardFeatures::Loader::Loader(StandardFeatures &f):
 689         DataFile::ObjectLoader<StandardFeatures>(f)
 690 {
 691         add("custom",    &StandardFeatures::custom);
 692         add("lighting",  &StandardFeatures::lighting);
 693         add("material",  &StandardFeatures::material);
 694         add("normalmap", &StandardFeatures::normalmap);
 695         add("reflection", &StandardFeatures::reflection);
 696         add("shadow",    &StandardFeatures::shadow);
 697         add("specular",  &StandardFeatures::specular);
 698         add("texture",   &StandardFeatures::texture);
 699 }
 700
 701 } // namespace GL
 702 } // namespace Msp