source/programbuilder.cpp

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