source/programbuilder.cpp

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