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", "vec4", "frag_color", "g" },
  45         { FRAGMENT, "frag_color", "vec4", "color_base", "!t" },
  46         { FRAGMENT, "frag_color", "vec4", "tex_sample", "!l!s!mt" },
  47         { FRAGMENT, "frag_color", "vec4", "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, "rgb_light_full", "vec3", "rgb_light_shadow", "!m" },
  58         { FRAGMENT, "ambient_product_diffuse", "vec4", "gl_FrontLightModelProduct.sceneColor", "g" },
  59         { FRAGMENT, "ambient_product_diffuse", "vec4", "ambient_color*material.diffuse", "!g" },
  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", "vec4", "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, 0 },
 119         { UNIFORM, "light_sources", "struct { vec4 position; vec4 diffuse; vec4 specular; }[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         for(list<ShaderVariable *>::const_iterator i=resolved_vars.begin(); i!=resolved_vars.end(); ++i)
 296                 (*i)->check_inline(features.legacy, !optimize);
 297
 298         prog.attach_shader_owned(new VertexShader(create_source(resolved_vars, VERTEX)));
 299         prog.attach_shader_owned(new FragmentShader(create_source(resolved_vars, FRAGMENT)));
 300
 301         if(!features.legacy)
 302         {
 303                 prog.bind_fragment_data(0, "frag_color");
 304                 prog.bind_attribute(VERTEX4, "vertex");
 305                 if(features.lighting)
 306                         prog.bind_attribute(NORMAL3, "normal");
 307                 else if(features.material)
 308                         prog.bind_attribute(COLOR4_FLOAT, "color");
 309                 if(features.texture || features.normalmap)
 310                         prog.bind_attribute(TEXCOORD4, "texcoord");
 311         }
 312         if(features.normalmap)
 313         {
 314                 prog.bind_attribute(get_component_type(TANGENT3), "tangent");
 315                 prog.bind_attribute(get_component_type(BINORMAL3), "binormal");
 316         }
 317 }
 318
 319 string ProgramBuilder::create_source(const list<ShaderVariable *> &variables, VariableScope scope) const
 320 {
 321         string source;
 322
 323         if(!features.legacy)
 324                 source += "#version 130\n";
 325
 326         for(list<ShaderVariable *>::const_iterator i=variables.begin(); i!=variables.end(); ++i)
 327                 if((*i)->variable->scope==UNIFORM && (*i)->is_referenced_from(scope) && !(*i)->inlined)
 328                         source += format("uniform %s;\n", (*i)->create_declaration());
 329
 330         if(scope==VERTEX)
 331         {
 332                 const char *qualifier = (features.legacy ? "attribute" : "in");
 333                 for(list<ShaderVariable *>::const_iterator i=variables.begin(); i!=variables.end(); ++i)
 334                         if((*i)->variable->scope==ATTRIBUTE && !(*i)->inlined)
 335                                 source += format("%s %s;\n", qualifier, (*i)->create_declaration());
 336         }
 337
 338         /* Any variables defined in vertex scope but referenced from fragment scope
 339         should be exported as varyings over the interface. */
 340         list<ShaderVariable *> varyings;
 341         for(list<ShaderVariable *>::const_iterator i=variables.begin(); i!=variables.end(); ++i)
 342                 if(((*i)->variable->scope==VERTEX || (*i)->variable->scope==ATTRIBUTE) && (*i)->is_referenced_from(FRAGMENT))
 343                 {
 344                         varyings.push_back(*i);
 345                         const char *qualifier;
 346                         if(!features.legacy)
 347                                 qualifier = (scope==VERTEX ? "out" : "in");
 348                         else
 349                                 qualifier = "varying";
 350                         source += format("%s %s;\n", qualifier, (*i)->create_declaration('v'));
 351                 }
 352
 353         for(list<ShaderVariable *>::const_iterator i=variables.begin(); i!=variables.end(); ++i)
 354                 if((*i)->referenced_by.empty() && (*i)->resolved_name.compare(0, 3, "gl_"))
 355                         source += format("out %s;\n", (*i)->create_declaration());
 356
 357         source += "void main()\n{\n";
 358
 359         for(list<ShaderVariable *>::const_iterator i=variables.begin(); i!=variables.end(); ++i)
 360                 if((*i)->variable->scope==scope && !(*i)->inlined)
 361                 {
 362                         source += '\t';
 363                         if((*i)->referenced_by.empty())
 364                                 source += (*i)->resolved_name;
 365                         else
 366                                 source += (*i)->create_declaration();
 367                         source += format(" = %s;\n", (*i)->create_expression());
 368                 }
 369
 370         if(scope==VERTEX)
 371         {
 372                 for(list<ShaderVariable *>::const_iterator i=varyings.begin(); i!=varyings.end(); ++i)
 373                 {
 374                         if((*i)->inlined)
 375                                 source += format("\tv_%s = %s;\n", (*i)->resolved_name, (*i)->create_expression());
 376                         else
 377                                 source += format("\tv_%s = %s;\n", (*i)->resolved_name, (*i)->resolved_name);
 378                 }
 379         }
 380
 381         source += '}';
 382
 383         return source;
 384 }
 385
 386 bool ProgramBuilder::evaluate_flags(const char *flags) const
 387 {
 388         if(!flags)
 389                 return true;
 390
 391         bool cond = true;
 392         char oper = '&';
 393         for(const char *i=flags; *i; ++i)
 394         {
 395                 if(*i>='a' && *i<='z')
 396                 {
 397                         bool found = (feature_flags.find(*i)!=string::npos);
 398                         if(oper=='|')
 399                                 cond = (cond || found);
 400                         else if(oper=='!')
 401                                 cond = (cond && !found);
 402                         else if(oper=='&')
 403                                 cond = (cond && found);
 404                         oper = '&';
 405                 }
 406                 else
 407                         oper = *i;
 408         }
 409
 410         return cond;
 411 }
 412
 413 ProgramBuilder::MatchLevel ProgramBuilder::name_match(const char *n1, const char *n2, const char **space)
 414 {
 415         int i = 0;
 416         int zzz = -1;
 417         int zside = 0;
 418         while(*n1 && *n2)
 419         {
 420                 if(*n1==*n2 || *n1=='z' || *n2=='z')
 421                 {
 422                         if(*n1!=*n2)
 423                         {
 424                                 int side = (*n1=='z' ? 1 : 2);
 425                                 if(zzz<0)
 426                                 {
 427                                         zzz = i;
 428                                         zside = side;
 429                                         if(space)
 430                                         {
 431                                                 if(*n1=='z')
 432                                                         *space = n2;
 433                                                 else
 434                                                         *space = n1;
 435                                         }
 436                                 }
 437                                 else if(i>=zzz+3 || side!=zside)
 438                                         return NO_MATCH;
 439                         }
 440                 }
 441                 else
 442                         return NO_MATCH;
 443                 ++n1;
 444                 ++n2;
 445                 ++i;
 446         }
 447         return (!*n1 && !*n2) ? zzz>=0 ? FUZZY : EXACT : NO_MATCH;
 448 }
 449
 450 bool ProgramBuilder::parse_identifier(const char *ptr, unsigned &start, unsigned &length)
 451 {
 452         bool found = false;
 453         bool member = false;
 454         for(const char *i=ptr;; ++i)
 455         {
 456                 if(!found)
 457                 {
 458                         if(!*i)
 459                                 return false;
 460                         if(isalpha(*i) || *i=='_')
 461                         {
 462                                 if(!member)
 463                                 {
 464                                         start = i-ptr;
 465                                         found = true;
 466                                 }
 467                         }
 468                         else if(*i=='.')
 469                                 member = true;
 470                         else
 471                                 member = false;
 472                 }
 473                 else
 474                 {
 475                         if(!isalnum(*i) && *i!='_')
 476                         {
 477                                 length = i-(ptr+start);
 478                                 return true;
 479                         }
 480                 }
 481         }
 482 }
 483
 484 vector<string> ProgramBuilder::extract_identifiers(const char *expression)
 485 {
 486         vector<string> result;
 487         const char *ptr = expression;
 488         unsigned start = 0;
 489         unsigned length = 0;
 490         while(parse_identifier(ptr, start, length))
 491         {
 492                 result.push_back(string(ptr+start, length));
 493                 ptr += start+length;
 494         }
 495         return result;
 496 }
 497
 498 string ProgramBuilder::replace_identifiers(const char *expression, const map<string, string> &replace_map)
 499 {
 500         string result;
 501         const char *ptr = expression;
 502         unsigned start = 0;
 503         unsigned length = 0;
 504         while(parse_identifier(ptr, start, length))
 505         {
 506                 result.append(ptr, start);
 507                 string identifier(ptr+start, length);
 508                 map<string, string>::const_iterator i = replace_map.find(identifier);
 509                 if(i!=replace_map.end())
 510                         result += i->second;
 511                 else
 512                         result += identifier;
 513                 ptr += start+length;
 514         }
 515         result += ptr;
 516         return result;
 517 }
 518
 519
 520 ProgramBuilder::StandardFeatures::StandardFeatures():
 521         texture(false),
 522         material(false),
 523         lighting(false),
 524         specular(false),
 525         normalmap(false),
 526         shadow(false),
 527         reflection(false),
 528         legacy(!(get_glsl_version()>=Version(1, 30)))
 529 { }
 530
 531 string ProgramBuilder::StandardFeatures::create_flags() const
 532 {
 533         string flags;
 534         if(texture)
 535                 flags += 't';
 536         if(material)
 537                 flags += 'm';
 538         if(lighting)
 539         {
 540                 flags += 'l';
 541                 if(specular)
 542                         flags += 'p';
 543                 if(normalmap)
 544                         flags += 'n';
 545         }
 546         if(shadow)
 547                 flags += 's';
 548         if(reflection)
 549                 flags += 'e';
 550         if(legacy)
 551                 flags += 'g';
 552
 553         return flags;
 554 }
 555
 556
 557 ProgramBuilder::ShaderVariable::ShaderVariable(const std::string &n):
 558         name(n),
 559         variable(0),
 560         resolved_name(n),
 561         fuzzy_space(name.find("zzz")!=string::npos),
 562         inlined(false),
 563         inline_parens(false)
 564 { }
 565
 566 void ProgramBuilder::ShaderVariable::resolve(const VariableDefinition &var)
 567 {
 568         variable = &var;
 569         const char *space = 0;
 570         if(name_match(var.name, resolved_name.c_str(), &space)==FUZZY)
 571                 resolve_space(string(space, 3));
 572
 573 }
 574
 575 void ProgramBuilder::ShaderVariable::resolve(ShaderVariable &var)
 576 {
 577         for(list<ShaderVariable *>::iterator i=referenced_by.begin(); i!=referenced_by.end(); ++i)
 578                 (*i)->update_reference(*this, var);
 579         var.referenced_by.insert(var.referenced_by.end(), referenced_by.begin(), referenced_by.end());
 580 }
 581
 582 void ProgramBuilder::ShaderVariable::resolve_space(const string &space)
 583 {
 584         if(fuzzy_space)
 585         {
 586                 resolved_space = space;
 587
 588                 string::size_type zzz = resolved_name.find("zzz");
 589                 resolved_name.replace(zzz, 3, resolved_space);
 590                 fuzzy_space = false;
 591
 592                 // Resolving the space could have affected other variables that use this one
 593                 for(list<ShaderVariable *>::iterator i=referenced_by.begin(); i!=referenced_by.end(); ++i)
 594                         (*i)->resolve_space(space);
 595         }
 596
 597         for(list<ShaderVariable *>::iterator i=referenced_vars.begin(); i!=referenced_vars.end(); ++i)
 598                 if((*i)->fuzzy_space)
 599                         (*i)->resolve_space(space);
 600 }
 601
 602 void ProgramBuilder::ShaderVariable::add_reference(ShaderVariable &var)
 603 {
 604         referenced_vars.push_back(&var);
 605         var.referenced_by.push_back(this);
 606         if(var.fuzzy_space && !resolved_space.empty())
 607                 var.resolve_space(resolved_space);
 608 }
 609
 610 void ProgramBuilder::ShaderVariable::update_reference(ShaderVariable &from, ShaderVariable &to)
 611 {
 612         replace(referenced_vars.begin(), referenced_vars.end(), &from, &to);
 613         replace(referenced_by.begin(), referenced_by.end(), &from, &to);
 614         if(from.fuzzy_space && !to.fuzzy_space && !to.resolved_space.empty())
 615                 resolve_space(to.resolved_space);
 616 }
 617
 618 void ProgramBuilder::ShaderVariable::check_inline(bool allow_legacy, bool trivial_only)
 619 {
 620         if(variable->expression)
 621         {
 622                 if(!allow_legacy && !strncmp(variable->expression, "gl_", 3))
 623                         return;
 624
 625                 // Never inline goal variables
 626                 unsigned total_refs = referenced_by.size();
 627                 if(!total_refs)
 628                         return;
 629
 630                 // Inline an expression consisting of a single identifier
 631                 unsigned start, length;
 632                 if(parse_identifier(variable->expression, start, length))
 633                         if(start==0 && variable->expression[length]==0)
 634                         {
 635                                 inlined = true;
 636                                 return;
 637                         }
 638
 639                 if(trivial_only)
 640                         return;
 641
 642                 unsigned in_scope_refs = 0;
 643                 for(list<ShaderVariable *>::const_iterator i=referenced_by.begin(); i!=referenced_by.end(); ++i)
 644                         if((*i)->variable->scope==variable->scope)
 645                                 ++in_scope_refs;
 646
 647                 /* Inline if there's only one ref, or if all refs are in other scopes.
 648                 In the latter case, the actual inlining will happen in the interface
 649                 variable assignment. */
 650                 if(total_refs==1 || in_scope_refs==0)
 651                 {
 652                         inlined = true;
 653                         unsigned level = 0;
 654                         for(const char *c=variable->expression; (!inline_parens && *c); ++c)
 655                         {
 656                                 if(*c=='(')
 657                                         ++level;
 658                                 else if(*c==')')
 659                                         --level;
 660                                 else if(level==0 && !isalnum(*c) && *c!='_' && *c!='.')
 661                                         inline_parens = true;
 662                         }
 663                 }
 664         }
 665 }
 666
 667 bool ProgramBuilder::ShaderVariable::is_referenced_from(VariableScope scope) const
 668 {
 669         for(list<ShaderVariable *>::const_iterator i=referenced_by.begin(); i!=referenced_by.end(); ++i)
 670                 if((*i)->variable->scope==scope)
 671                         return true;
 672         return false;
 673 }
 674
 675 string ProgramBuilder::ShaderVariable::create_declaration(char interface) const
 676 {
 677         if(variable->scope==UNIFORM)
 678         {
 679                 const char *bracket = strrchr(variable->type, '[');
 680                 if(bracket)
 681                         return format("%s %s%s", string(variable->type, bracket), resolved_name, bracket);
 682         }
 683
 684         if(interface)
 685                 return format("%s %c_%s", variable->type, interface, resolved_name);
 686         else
 687                 return format("%s %s", variable->type, resolved_name);
 688 }
 689
 690 string ProgramBuilder::ShaderVariable::create_replacement(VariableScope from_scope) const
 691 {
 692         string replacement = resolved_name;
 693         if(variable)
 694         {
 695                 if(from_scope==FRAGMENT && (variable->scope==VERTEX || variable->scope==ATTRIBUTE))
 696                         replacement = "v_"+replacement;
 697                 else if(inlined)
 698                 {
 699                         replacement = create_expression();
 700                         if(inline_parens)
 701                                 replacement = "("+replacement+")";
 702                 }
 703         }
 704
 705         return replacement;
 706 }
 707
 708 string ProgramBuilder::ShaderVariable::create_expression() const
 709 {
 710         map<string, string> replace_map;
 711         for(list<ShaderVariable *>::const_iterator i=referenced_vars.begin(); i!=referenced_vars.end(); ++i)
 712         {
 713                 string replacement = (*i)->create_replacement(variable->scope);
 714                 if(replacement!=(*i)->name)
 715                         replace_map[(*i)->name] = replacement;
 716         }
 717
 718         if(replace_map.empty())
 719                 return variable->expression;
 720         else
 721                 return replace_identifiers(variable->expression, replace_map);
 722 }
 723
 724
 725 ProgramBuilder::StandardFeatures::Loader::Loader(StandardFeatures &f):
 726         DataFile::ObjectLoader<StandardFeatures>(f)
 727 {
 728         add("custom",    &StandardFeatures::custom);
 729         add("lighting",  &StandardFeatures::lighting);
 730         add("material",  &StandardFeatures::material);
 731         add("normalmap", &StandardFeatures::normalmap);
 732         add("reflection", &StandardFeatures::reflection);
 733         add("shadow",    &StandardFeatures::shadow);
 734         add("specular",  &StandardFeatures::specular);
 735         add("texture",   &StandardFeatures::texture);
 736 }
 737
 738 } // namespace GL
 739 } // namespace Msp