4 #include <msp/gl/extensions/arb_uniform_buffer_object.h>
5 #include <msp/strings/format.h>
6 #include <msp/strings/utils.h>
9 #include "programbuilder.h"
11 #include "vertexformat.h"
21 l_* Lighting component
25 tbn_* Tangent-Binormal-Normal space
27 env_* Environment space
28 *_dir Direction vector
30 zzz_* Wildcard space, resolved by the builder
31 All wildcard spaces within an expression must match
33 xxx_yyy_* Matrix that transforms between yyy to xxx
34 The vector is on the side of its designated space, result will be
36 *_matrix A matrix (duh)
37 *_rmatrix A mat4 that works with a row vector
39 rgb_* Color with rgb components only
40 color_* Color with rgba components
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[] =
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" },
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" },
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" },
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" },
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 },
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 },
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 },
97 { FRAGMENT, "l_shadow", "float", "mix(1.0, shadow_sample, shadow_darkness)", 0 },
98 { FRAGMENT, "shadow_sample", "float", "shadow2D(shadow, shd_vertex).r", 0 },
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 },
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 },
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 },
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 },
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 },
152 { NO_SCOPE, 0, 0, 0, 0 }
155 const char ProgramBuilder::interfaces[] = { 0, 0, 0, 0, 'v', 0 };
157 ProgramBuilder::ProgramBuilder(const StandardFeatures &f):
159 feature_flags(features.create_flags()),
162 if(!features.custom.empty())
164 const char *whitespace = " \t\n";
165 string::size_type start = 0;
168 start = features.custom.find_first_not_of(whitespace, start);
169 if(start==string::npos)
172 string::size_type semicolon = features.custom.find(';', start);
178 else if(semicolon==string::npos)
179 throw invalid_variable_definition(features.custom.substr(start));
181 string::size_type equals = features.custom.find('=', start);
183 equals = string::npos;
185 VariableDefinition var;
186 string::size_type decl_end = min(equals, semicolon);
187 for(unsigned i=0;; ++i)
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;
193 const char *word = &features.custom[start];
196 if(!strcmp(word, "uniform"))
198 else if(!strcmp(word, "attribute"))
199 var.scope = ATTRIBUTE;
200 else if(!strcmp(word, "vertex"))
202 else if(!strcmp(word, "fragment"))
203 var.scope = FRAGMENT;
205 throw invalid_variable_definition(word);
212 start = features.custom.find_first_not_of(whitespace, word_end+1);
217 if(equals!=string::npos)
219 start = features.custom.find_first_not_of(whitespace, equals+1);
221 throw invalid_variable_definition("no expression");
222 features.custom[semicolon] = 0;
223 var.expression = &features.custom[start];
229 for(const VariableDefinition *j=standard_variables; j->name; ++j)
230 if(!strcmp(var.name, j->name))
233 custom_variables.push_front(var);
239 if((get_gl_api()==OPENGL && !features.legacy) || (get_gl_api()==OPENGL_ES2 && get_glsl_version()>=Version(3, 0)))
241 aliases["texture2D"] = "texture";
242 aliases["shadow2D"] = "texture";
246 void ProgramBuilder::set_optimize(bool o)
251 Program *ProgramBuilder::create_program() const
253 Program *prog = new Program;
258 void ProgramBuilder::add_shaders(Program &prog) const
260 list<ShaderVariable> variables;
261 list<ShaderVariable *> resolved_vars;
263 variables.push_front(ShaderVariable("gl_Position"));
264 variables.push_front(ShaderVariable(features.legacy ? "gl_FragColor" : "frag_color"));
266 list<VariableDefinition>::const_iterator next_custom = custom_variables.begin();
267 for(const VariableDefinition *i=standard_variables; i->name; )
269 const VariableDefinition *def = 0;
270 if(next_custom!=custom_variables.end() && (!strcmp(next_custom->name, i->name) || !next_custom->flags))
280 // Skip over anything that isn't used with the supplied flags
281 if(def->flags && !evaluate_flags(def->flags))
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);
294 const char *def_uq_name = unqualified_name(def->name);
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)
303 if(!name_match(def_uq_name, j->resolved_name.c_str()))
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);
316 resolved_vars.push_front(&*j);
323 vector<string> identifiers = extract_identifiers(def->expression);
324 for(vector<string>::const_iterator k=identifiers.begin(); k!=identifiers.end(); ++k)
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)
334 variables.push_back(ShaderVariable(*k));
335 var = &variables.back();
337 j->add_reference(*var);
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);
346 for(list<ShaderVariable *>::const_iterator i=resolved_vars.begin(); i!=resolved_vars.end(); ++i)
347 (*i)->check_inline(features.legacy, !optimize);
349 prog.attach_shader_owned(new VertexShader(create_source(resolved_vars, VERTEX)));
350 prog.attach_shader_owned(new FragmentShader(create_source(resolved_vars, FRAGMENT)));
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");
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");
366 if(features.normalmap)
368 prog.bind_attribute(get_component_type(TANGENT3), "tangent");
369 prog.bind_attribute(get_component_type(BINORMAL3), "binormal");
373 string ProgramBuilder::create_source(const list<ShaderVariable *> &variables, VariableScope scope) const
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;
382 if(get_gl_api()==OPENGL_ES2)
385 source += "#version 300 es\n";
389 source += "#version 130\n";
391 source += "#extension GL_ARB_uniform_buffer_object: require\n";
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)
400 if((*i)->type && !declared_types.count((*i)->type))
402 source += format("%s;\n", (*i)->create_type_declaration());
403 declared_types.insert((*i)->type);
406 if(!(*i)->resolved_block.empty() && use_blocks)
407 uniform_blocks.insert((*i)->resolved_block);
409 source += format("uniform %s;\n", (*i)->create_declaration());
412 for(set<string>::const_iterator i=uniform_blocks.begin(); i!=uniform_blocks.end(); ++i)
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());
421 /* Interface variables need to have global declarations. */
422 for(list<ShaderVariable *>::const_iterator i=variables.begin(); i!=variables.end(); ++i)
424 if(!(*i)->resolved_name.compare(0, 3, "gl_"))
427 InterfaceFlags interface = (*i)->get_interface_flags(scope);
431 const char *qualifier = (legacy_qualifiers ? scope==VERTEX ? "attribute" : "varying" : "in");
432 source += format("%s %s;\n", qualifier, (*i)->create_declaration(interfaces[scope-1]));
437 const char *qualifier = (legacy_qualifiers ? "varying" : "out");
438 source += format("%s %s;\n", qualifier, (*i)->create_declaration(interfaces[scope]));
442 source += "void main()\n{\n";
444 list<ShaderVariable *> loop_vars;
445 unsigned loop_size = 0;
446 for(list<ShaderVariable *>::const_iterator i=variables.begin(); i!=variables.end(); ++i)
448 if(!loop_vars.empty() && !loop_vars.back()->in_loop && (*i)->array_size!=loop_size)
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)
454 InterfaceFlags interface = (*j)->get_interface_flags(scope);
455 if(!(*j)->in_loop && !(interface&OUTPUT))
456 source += format("\t%s;\n", (*j)->create_declaration());
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)
462 if((*j)->variable->scope==scope && !(*j)->inlined)
466 decl = (*j)->create_declaration(0, true);
469 decl = (*j)->resolved_name;
473 const char *oper = ((*j)->array_sum ? "+=" : "=");
474 source += format("\t\t%s %s %s;\n", decl, oper, create_expression(**j, "i"));
477 InterfaceFlags interface = (*j)->get_interface_flags(scope);
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);
489 InterfaceFlags interface = (*i)->get_interface_flags(scope);
491 if((*i)->array_size>1)
493 if((*i)->variable->scope==scope || (interface&OUTPUT))
495 loop_size = (*i)->array_size;
496 loop_vars.push_back(*i);
501 if((*i)->variable->scope==scope && !(*i)->inlined)
503 string decl = ((interface&GOAL) ? (*i)->resolved_name : (*i)->create_declaration());
504 source += format("\t%s = %s;\n", decl, create_expression(**i));
507 if((interface&(OUTPUT|GOAL))==OUTPUT)
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);
519 bool ProgramBuilder::evaluate_flags(const char *flags) const
526 for(const char *i=flags; *i; ++i)
528 if(*i>='a' && *i<='z')
530 bool found = (feature_flags.find(*i)!=string::npos);
532 cond = (cond || found);
534 cond = (cond && !found);
536 cond = (cond && found);
546 const char *ProgramBuilder::unqualified_name(const char *name)
548 for(const char *p=name; *p; ++p)
549 if(*p==':' && *++p==':')
554 ProgramBuilder::MatchType ProgramBuilder::name_match(const char *n1, const char *n2, const char **space)
561 if(*n1==*n2 || *n1=='z' || *n2=='z')
565 int side = (*n1=='z' ? 1 : 2);
578 else if(i>=zzz+3 || side!=zside)
588 return (!*n1 && !*n2) ? (zzz>=0 ? FUZZY : EXACT) : ((*n1=='[' || *n2=='[') ? ARRAY : NO_MATCH);
591 bool ProgramBuilder::parse_identifier(const char *ptr, unsigned &start, unsigned &length)
595 bool subscript = false;
596 for(const char *i=ptr;; ++i)
602 if(isalpha(*i) || *i=='_')
621 length = i+1-(ptr+start);
624 else if(!isalpha(*i) || i>ptr+start+length+1)
627 else if(!isalnum(*i) && *i!='_')
629 length = i-(ptr+start);
639 vector<string> ProgramBuilder::extract_identifiers(const char *expression)
641 vector<string> result;
642 const char *ptr = expression;
645 while(parse_identifier(ptr, start, length))
647 result.push_back(string(ptr+start, length));
653 string ProgramBuilder::replace_identifiers(const char *expression, const map<string, string> &replace_map)
656 const char *ptr = expression;
659 while(parse_identifier(ptr, start, length))
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())
667 result += identifier;
674 string ProgramBuilder::create_expression(const ShaderVariable &var, const char *loop) const
676 string expr = var.create_expression(loop);
677 return replace_identifiers(expr.c_str(), aliases);
681 ProgramBuilder::StandardFeatures::StandardFeatures():
691 legacy(get_gl_api()==OPENGL && !(get_glsl_version()>=Version(1, 30)))
694 string ProgramBuilder::StandardFeatures::create_flags() const
722 ProgramBuilder::ShaderVariable::ShaderVariable(const std::string &n):
727 fuzzy_space(name.find("zzz")!=string::npos),
731 inline_parens(false),
734 string::size_type bracket = name.find('[');
735 if(bracket!=string::npos)
736 array_subscript = name.substr(bracket+1, name.size()-bracket-2);
739 void ProgramBuilder::ShaderVariable::resolve(const VariableDefinition &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);
746 if(var_uq_name!=variable->name)
747 resolved_block.assign(variable->name, var_uq_name-2);
750 resolve_space(string(space, 3));
751 else if(match==ARRAY)
753 if(array_subscript.empty())
755 else if(var.scope==UNIFORM)
757 const char *bracket = strrchr(variable->type, '[');
759 array_subscript = string(bracket+1, strlen(bracket)-2);
764 void ProgramBuilder::ShaderVariable::resolve(ShaderVariable &var)
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());
771 void ProgramBuilder::ShaderVariable::resolve_type(const VariableDefinition &var)
776 void ProgramBuilder::ShaderVariable::resolve_space(const string &space)
780 resolved_space = space;
782 string::size_type zzz = resolved_name.find("zzz");
783 resolved_name.replace(zzz, 3, resolved_space);
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);
791 for(list<ShaderVariable *>::iterator i=referenced_vars.begin(); i!=referenced_vars.end(); ++i)
792 if((*i)->fuzzy_space)
793 (*i)->resolve_space(space);
796 void ProgramBuilder::ShaderVariable::resolve_array(const StandardFeatures &features, unsigned size_hint)
800 if(!array_sum && array_subscript.empty())
803 if(!array_subscript.empty())
805 string::size_type bracket = resolved_name.find('[');
806 if(bracket!=string::npos)
807 resolved_name = resolved_name.substr(0, bracket);
810 if(variable && variable->scope==UNIFORM)
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);
817 throw invalid_variable_definition("invalid array size");
822 for(list<ShaderVariable *>::const_iterator i=referenced_vars.begin(); i!=referenced_vars.end(); ++i)
825 array_size = (*i)->array_size;
830 if(!array_size && size_hint)
831 array_size = size_hint;
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);
841 void ProgramBuilder::ShaderVariable::add_reference(ShaderVariable &var)
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);
849 void ProgramBuilder::ShaderVariable::update_reference(ShaderVariable &from, ShaderVariable &to)
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);
857 void ProgramBuilder::ShaderVariable::check_inline(bool allow_legacy, bool trivial_only)
859 if(variable->expression)
861 if(array_sum && array_size>1)
863 if(!allow_legacy && !strncmp(variable->expression, "gl_", 3))
866 // Never inline goal variables
867 if(referenced_by.empty())
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)
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)
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)
895 unsigned count = max((*i)->array_size*!in_loop, 1U);
897 if((*i)->variable->scope==variable->scope)
898 in_scope_refs += count;
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)
908 for(const char *c=variable->expression; (!inline_parens && *c); ++c)
914 else if(level==0 && !isalnum(*c) && *c!='_' && *c!='.')
915 inline_parens = true;
921 bool ProgramBuilder::ShaderVariable::is_referenced_from(VariableScope scope) const
923 for(list<ShaderVariable *>::const_iterator i=referenced_by.begin(); i!=referenced_by.end(); ++i)
924 if((*i)->variable->scope==scope)
929 ProgramBuilder::InterfaceFlags ProgramBuilder::ShaderVariable::get_interface_flags(VariableScope scope) const
931 /* Uniforms are available to all stages and are not passed through
933 if(variable->scope==UNIFORM)
936 int flags = NO_INTERFACE;
938 for(list<ShaderVariable *>::const_iterator i=referenced_by.begin(); i!=referenced_by.end(); ++i)
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)
944 if((*i)->variable->scope>=scope && variable->scope<scope)
945 if(!inlined || variable->scope!=ATTRIBUTE || scope!=VERTEX)
949 // Variables without any references are goals and also outputs.
950 if(referenced_by.empty() && variable->scope==scope)
951 flags |= OUTPUT|GOAL;
953 return static_cast<InterfaceFlags>(flags);
956 string ProgramBuilder::ShaderVariable::create_type_declaration() const
959 throw logic_error("no type");
961 if(!strncmp(type->type, "struct", 6))
963 const char *brace = strchr(type->type, '{');
965 return format("struct %s %s", type->name, brace);
968 throw invalid_variable_definition("invalid typedef");
971 string ProgramBuilder::ShaderVariable::create_declaration(char interface, bool loop) const
973 if(variable->scope==UNIFORM && !array_subscript.empty())
975 const char *bracket = strrchr(variable->type, '[');
977 return format("%s %s[%d]", string(variable->type, bracket), resolved_name, array_size);
981 if(!array_sum && array_size>1 && !loop)
982 array = format("[%d]", array_size);
985 return format("%s %c_%s%s", variable->type, interface, resolved_name, array);
987 return format("%s %s%s", variable->type, resolved_name, array);
990 string ProgramBuilder::ShaderVariable::create_replacement(VariableScope from_scope, const char *loop) const
992 string replacement = resolved_name;
993 InterfaceFlags interface = NO_INTERFACE;
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);
1001 replacement = create_expression(loop);
1003 replacement = "("+replacement+")";
1008 // Add an array subscript, unless the variable is embedded in a loop
1009 if(!array_subscript.empty() && !in_loop)
1012 return format("%s[%s]", replacement, loop);
1013 else if(!variable || variable->scope==UNIFORM)
1014 return replacement+"[0]";
1020 string ProgramBuilder::ShaderVariable::create_expression(const char *loop) const
1022 map<string, string> replace_map;
1023 for(list<ShaderVariable *>::const_iterator i=referenced_vars.begin(); i!=referenced_vars.end(); ++i)
1025 string replacement = (*i)->create_replacement(variable->scope, loop);
1026 if(replacement!=(*i)->name)
1027 replace_map[(*i)->name] = replacement;
1030 if(replace_map.empty())
1031 return variable->expression;
1033 return replace_identifiers(variable->expression, replace_map);
1037 ProgramBuilder::StandardFeatures::Loader::Loader(StandardFeatures &f):
1038 DataFile::ObjectLoader<StandardFeatures>(f)
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);