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