3 #include <msp/strings/format.h>
4 #include <msp/strings/utils.h>
7 #include "programbuilder.h"
9 #include "vertexformat.h"
19 l_* Lighting component
23 tbn_* Tangent-Binormal-Normal space
25 env_* Environment space
26 *_dir Direction vector
28 zzz_* Wildcard space, resolved by the builder
29 All wildcard spaces within an expression must match
31 xxx_yyy_* Matrix that transforms between yyy to xxx
32 The vector is on the side of its designated space, result will be
34 *_matrix A matrix (duh)
35 *_rmatrix A mat4 that works with a row vector
37 rgb_* Color with rgb components only
38 color_* Color with rgba components
41 /* The array is stored in reverse order, so that variables always come after
42 anything that might need them. */
43 const ProgramBuilder::VariableDefinition ProgramBuilder::standard_variables[] =
45 { FRAGMENT, "gl_FragColor", "vec4", "frag_color", "g" },
46 { FRAGMENT, "frag_color", "vec4", "basic_color", "!e!l" },
47 { FRAGMENT, "frag_color", "vec4", "vec4(rgb_surface, surface_alpha)", "!el" },
48 { FRAGMENT, "frag_color", "vec4", "vec4(rgb_surface+rgb_reflection, surface_alpha)", "e" },
50 { FRAGMENT, "rgb_reflection", "vec3", "reflect_sample.rgb*reflectivity", 0 },
51 { FRAGMENT, "reflect_sample", "vec4", "textureCube(environment, env_reflect_dir)", 0 },
52 { FRAGMENT, "env_reflect_dir", "vec3", "env_eye_matrix*eye_reflect_dir", 0 },
53 { FRAGMENT, "eye_reflect_dir", "vec3", "eye_tbn_matrix*tbn_reflect_dir", "n" },
55 { FRAGMENT, "rgb_surface", "vec3", "rgb_unlit_surface", "!l" },
56 { FRAGMENT, "rgb_surface", "vec3", "rgb_lit_surface", "l" },
57 { FRAGMENT, "rgb_unlit_surface", "vec3", "basic_color.rgb", "!s" },
58 { FRAGMENT, "rgb_unlit_surface", "vec3", "basic_color.rgb*l_shadow", "s" },
59 { FRAGMENT, "rgb_lit_surface", "vec3", "rgb_illumination_diffuse", "!m" },
60 { FRAGMENT, "rgb_lit_surface", "vec3", "rgb_surface_ambient+rgb_surface_diffuse", "m!p" },
61 { FRAGMENT, "rgb_lit_surface", "vec3", "rgb_surface_ambient+rgb_surface_diffuse+rgb_surface_specular", "mp" },
63 { FRAGMENT, "surface_alpha", "float", "basic_color.a", "!m" },
64 { FRAGMENT, "surface_alpha", "float", "basic_color.a", "m!l" },
65 { FRAGMENT, "surface_alpha", "float", "material.diffuse.a", "ml!t" },
66 { FRAGMENT, "surface_alpha", "float", "material.diffuse.a*tex_sample.a", "mlt" },
67 { FRAGMENT, "basic_color", "vec4", "vec4(1.0)", "!m!t" },
68 { FRAGMENT, "basic_color", "vec4", "tex_sample", "!mt" },
69 { FRAGMENT, "basic_color", "vec4", "color", "m!t" },
70 { FRAGMENT, "basic_color", "vec4", "color*tex_sample", "mt" },
72 { FRAGMENT, "rgb_surface_ambient", "vec3", "rgb_illumination_ambient*material.ambient.rgb", "!t" },
73 { FRAGMENT, "rgb_surface_ambient", "vec3", "rgb_illumination_ambient*material.ambient.rgb*tex_sample.rgb", "t" },
74 { FRAGMENT, "rgb_illumination_ambient", "vec3", "ambient_color.rgb", "!y" },
75 { FRAGMENT, "rgb_illumination_ambient", "vec3", "ambient_color.rgb+l_skylight*sky_color.rgb", "y" },
76 { FRAGMENT, "l_skylight", "float", "dot(n_zzz_normal, zzz_sky_dir)*0.5+0.5", 0 },
78 { FRAGMENT, "rgb_surface_specular", "vec3", "rgb_illumination_specular*material.specular.rgb", 0 },
79 { FRAGMENT, "rgb_illumination_specular", "vec3", "rgb_illumination_specular_direct", "!y|e" },
80 { FRAGMENT, "rgb_illumination_specular", "vec3", "rgb_illumination_specular_direct+l_sky_specular*sky_color.rgb", "y!e" },
81 { FRAGMENT, "rgb_illumination_specular_direct", "vec3", "rgb_light_specular", "!s" },
82 { FRAGMENT, "rgb_illumination_specular_direct", "vec3", "rgb_light_specular*l_shadow", "s" },
83 { FRAGMENT, "rgb_light_specular[i]", "vec3", "l_specular[i]*light_sources[i].specular.rgb", 0 },
84 { 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 },
85 { FRAGMENT, "l_specular[i]", "float", "pow(max(dot(n_zzz_half_vec[i], n_zzz_normal), 0.0), material.shininess)", 0 },
87 { FRAGMENT, "rgb_surface_diffuse", "vec3", "rgb_illumination_diffuse*material.diffuse.rgb", "!t" },
88 { FRAGMENT, "rgb_surface_diffuse", "vec3", "rgb_illumination_diffuse*material.diffuse.rgb*tex_sample.rgb", "t" },
89 { FRAGMENT, "rgb_illumination_diffuse", "vec3", "rgb_light_diffuse", "!s" },
90 { FRAGMENT, "rgb_illumination_diffuse", "vec3", "rgb_light_diffuse*l_shadow", "s" },
91 { FRAGMENT, "rgb_light_diffuse[i]", "vec3", "l_diffuse[i]*light_sources[i].diffuse.rgb", 0 },
92 { FRAGMENT, "l_diffuse[i]", "float", "max(dot(n_zzz_normal, n_zzz_light_dir[i]), 0.0)", 0 },
94 { FRAGMENT, "l_shadow", "float", "mix(1.0, shadow_sample, shadow_darkness)", 0 },
95 { FRAGMENT, "shadow_sample", "float", "shadow2D(shadow, shd_vertex).r", 0 },
97 { FRAGMENT, "zzz_reflect_dir", "vec3", "reflect(zzz_incident_dir, n_zzz_normal)", 0 },
98 { FRAGMENT, "n_zzz_half_vec[i]", "vec3", "normalize(zzz_light_dir[i]-zzz_incident_dir)", 0 },
99 { FRAGMENT, "n_zzz_light_dir[i]", "vec3", "normalize(zzz_light_dir[i])", 0 },
100 { FRAGMENT, "n_tbn_normal", "vec3", "normal_sample*2.0-1.0", "n" },
101 { FRAGMENT, "n_eye_normal", "vec3", "normalize(eye_normal)", "!n" },
102 { FRAGMENT, "normal_sample", "vec3", "texture2D(normalmap, texture_coord).xyz", 0 },
103 { FRAGMENT, "tex_sample", "vec4", "texture2D(texture, texture_coord)", 0 },
105 { VERTEX, "gl_Position", "vec4", "projection_matrix*eye_vertex", 0 },
106 { 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" },
107 { VERTEX, "shd_vertex", "vec3", "(shd_eye_matrix*eye_vertex).xyz", "!g" },
108 { VERTEX, "tbn_sky_dir", "vec3", "eye_sky_dir*eye_tbn_matrix", "n" },
109 { VERTEX, "tbn_light_dir[i]", "vec3", "eye_light_dir[i]*eye_tbn_matrix", 0 },
110 { VERTEX, "eye_light_dir[i]", "vec3", "normalize(eye_light_position[i].xyz-eye_vertex.xyz*eye_light_position[i].w)", 0 },
111 { VERTEX, "eye_light_position[i]", "vec4", "light_sources[i].position", 0 },
112 { VERTEX, "tbn_incident_dir", "vec3", "eye_incident_dir*eye_tbn_matrix", 0 },
113 { VERTEX, "eye_incident_dir", "vec3", "normalize(eye_vertex.xyz)", 0 },
114 { VERTEX, "eye_tbn_matrix", "mat3", "mat3(eye_tangent, eye_binormal, eye_normal)", 0 },
115 { VERTEX, "eye_vertex", "vec4", "eye_obj_matrix*vertex", 0 },
116 { VERTEX, "eye_normal", "vec3", "eye_obj_normal_matrix*normal", 0 },
117 { VERTEX, "eye_tangent", "vec3", "eye_obj_normal_matrix*tangent", 0 },
118 { VERTEX, "eye_binormal", "vec3", "eye_obj_normal_matrix*binormal", 0 },
119 { VERTEX, "texture_coord", "vec2", "texcoord.xy", 0 },
121 { ATTRIBUTE, "vertex", "vec4", "gl_Vertex", 0 },
122 { ATTRIBUTE, "texcoord", "vec4", "gl_MultiTexCoord0", 0 },
123 { ATTRIBUTE, "color", "vec4", "gl_Color", 0 },
124 { ATTRIBUTE, "normal", "vec3", "gl_Normal", 0 },
125 { ATTRIBUTE, "tangent", "vec3", 0, 0 },
126 { ATTRIBUTE, "binormal", "vec3", 0, 0 },
128 { UNIFORM, "shadow_unit", "int", 0, 0 },
129 { UNIFORM, "texture", "sampler2D", 0, 0 },
130 { UNIFORM, "shadow", "sampler2DShadow", 0, 0 },
131 { UNIFORM, "shadow_darkness", "float", 0, 0 },
132 { UNIFORM, "normalmap", "sampler2D", 0, 0 },
133 { UNIFORM, "environment", "samplerCube", 0, 0 },
134 { UNIFORM, "env_eye_matrix", "mat3", 0, 0 },
135 { UNIFORM, "reflectivity", "float", 0, 0 },
136 { UNIFORM, "eye_obj_matrix", "mat4", "gl_ModelViewMatrix", 0 },
137 { UNIFORM, "eye_obj_normal_matrix", "mat3", "gl_NormalMatrix", 0 },
138 { UNIFORM, "projection_matrix", "mat4", "gl_ProjectionMatrix", 0 },
139 { UNIFORM, "shd_eye_matrix", "mat4", 0, 0 },
140 { UNIFORM, "light_sources", "struct { vec4 position; vec4 diffuse; vec4 specular; }[MAX_LIGHTS]", "gl_LightSource[i]", 0 },
141 { UNIFORM, "ambient_color", "vec4", 0, 0 },
142 { UNIFORM, "sky_color", "vec4", 0, 0 },
143 { UNIFORM, "eye_sky_dir", "vec3", 0, 0 },
144 { UNIFORM, "horizon_limit", "float", 0, 0 },
145 { UNIFORM, "material", "struct { vec4 ambient; vec4 diffuse; vec4 specular; float shininess; }", "gl_FrontMaterial", 0 },
148 { NO_SCOPE, 0, 0, 0, 0 }
151 const char ProgramBuilder::interfaces[] = { 0, 0, 0, 'v', 0 };
153 ProgramBuilder::ProgramBuilder(const StandardFeatures &f):
155 feature_flags(features.create_flags()),
158 if(!features.custom.empty())
160 const char *whitespace = " \t\n";
161 string::size_type start = 0;
164 start = features.custom.find_first_not_of(whitespace, start);
165 if(start==string::npos)
168 string::size_type semicolon = features.custom.find(';', start);
174 else if(semicolon==string::npos)
175 throw invalid_variable_definition(features.custom.substr(start));
177 string::size_type equals = features.custom.find('=', start);
179 equals = string::npos;
181 VariableDefinition var;
182 string::size_type decl_end = min(equals, semicolon);
183 for(unsigned i=0;; ++i)
185 string::size_type word_end = features.custom.find_first_of(whitespace, start);
186 word_end = min(word_end, decl_end);
187 features.custom[word_end] = 0;
189 const char *word = &features.custom[start];
192 if(!strcmp(word, "uniform"))
194 else if(!strcmp(word, "attribute"))
195 var.scope = ATTRIBUTE;
196 else if(!strcmp(word, "vertex"))
198 else if(!strcmp(word, "fragment"))
199 var.scope = FRAGMENT;
201 throw invalid_variable_definition(word);
208 start = features.custom.find_first_not_of(whitespace, word_end+1);
213 if(equals!=string::npos)
215 start = features.custom.find_first_not_of(whitespace, equals+1);
217 throw invalid_variable_definition("no expression");
218 features.custom[semicolon] = 0;
219 var.expression = &features.custom[start];
225 for(const VariableDefinition *j=standard_variables; j->name; ++j)
226 if(!strcmp(var.name, j->name))
229 custom_variables.push_front(var);
236 void ProgramBuilder::set_optimize(bool o)
241 Program *ProgramBuilder::create_program() const
243 Program *prog = new Program;
248 void ProgramBuilder::add_shaders(Program &prog) const
250 list<ShaderVariable> variables;
251 list<ShaderVariable *> resolved_vars;
253 variables.push_front(ShaderVariable("gl_Position"));
254 variables.push_front(ShaderVariable(features.legacy ? "gl_FragColor" : "frag_color"));
256 list<VariableDefinition>::const_iterator next_custom = custom_variables.begin();
257 for(const VariableDefinition *i=standard_variables; i->name; )
259 const VariableDefinition *def = 0;
260 if(next_custom!=custom_variables.end() && (!strcmp(next_custom->name, i->name) || !next_custom->flags))
270 // Skip over anything that isn't used with the supplied flags
271 if(def->flags && !evaluate_flags(def->flags))
275 // See if this variable can satisfy any unresolved variables
276 ShaderVariable *last_resolved = 0;
277 for(list<ShaderVariable>::iterator j=variables.begin(); j!=variables.end(); ++j)
282 if(!name_match(def->name, j->resolved_name.c_str()))
287 /* We've already resolved a non-fuzzy variable in this iteration.
288 If there are multiple variables that can be resolved, they refer
289 to the same variable. */
290 j->resolve(*last_resolved);
295 resolved_vars.push_front(&*j);
302 vector<string> identifiers = extract_identifiers(def->expression);
303 for(vector<string>::const_iterator k=identifiers.begin(); k!=identifiers.end(); ++k)
305 // Use an existing variable if possible, but only if it's not fuzzy
306 ShaderVariable *var = 0;
307 for(list<ShaderVariable>::iterator l=variables.begin(); (!var && l!=variables.end()); ++l)
308 if(!l->fuzzy_space && l->resolved_name==*k)
313 variables.push_back(ShaderVariable(*k));
314 var = &variables.back();
316 j->add_reference(*var);
321 // Array sizes need to be resolved for inline processing
322 for(list<ShaderVariable>::iterator i=variables.end(); i!=variables.begin(); )
323 (--i)->resolve_array(features);
325 for(list<ShaderVariable *>::const_iterator i=resolved_vars.begin(); i!=resolved_vars.end(); ++i)
326 (*i)->check_inline(features.legacy, !optimize);
328 prog.attach_shader_owned(new VertexShader(create_source(resolved_vars, VERTEX)));
329 prog.attach_shader_owned(new FragmentShader(create_source(resolved_vars, FRAGMENT)));
333 prog.bind_fragment_data(0, "frag_color");
334 prog.bind_attribute(VERTEX4, "vertex");
335 if(features.lighting)
336 prog.bind_attribute(NORMAL3, "normal");
337 else if(features.material)
338 prog.bind_attribute(COLOR4_FLOAT, "color");
339 if(features.texture || features.normalmap)
340 prog.bind_attribute(TEXCOORD4, "texcoord");
342 if(features.normalmap)
344 prog.bind_attribute(get_component_type(TANGENT3), "tangent");
345 prog.bind_attribute(get_component_type(BINORMAL3), "binormal");
349 string ProgramBuilder::create_source(const list<ShaderVariable *> &variables, VariableScope scope) const
354 source += "#version 130\n";
356 for(list<ShaderVariable *>::const_iterator i=variables.begin(); i!=variables.end(); ++i)
357 if((*i)->variable->scope==UNIFORM && (*i)->is_referenced_from(scope) && !(*i)->inlined)
358 source += format("uniform %s;\n", (*i)->create_declaration());
360 /* Interface variables need to have global declarations. */
361 for(list<ShaderVariable *>::const_iterator i=variables.begin(); i!=variables.end(); ++i)
363 if(!(*i)->resolved_name.compare(0, 3, "gl_"))
366 InterfaceFlags interface = (*i)->get_interface_flags(scope);
370 const char *qualifier = (features.legacy ? scope==VERTEX ? "attribute" : "varying" : "in");
371 source += format("%s %s;\n", qualifier, (*i)->create_declaration(interfaces[scope-1]));
376 const char *qualifier = (features.legacy ? "varying" : "out");
377 source += format("%s %s;\n", qualifier, (*i)->create_declaration(interfaces[scope]));
381 source += "void main()\n{\n";
383 list<ShaderVariable *> loop_vars;
384 unsigned loop_size = 0;
385 for(list<ShaderVariable *>::const_iterator i=variables.begin(); i!=variables.end(); ++i)
387 if(!loop_vars.empty() && !loop_vars.back()->in_loop && (*i)->array_size!=loop_size)
389 /* Declare all variables that need to be visible outside the loop.
390 Output variables are already declared. */
391 for(list<ShaderVariable *>::const_iterator j=loop_vars.begin(); j!=loop_vars.end(); ++j)
393 InterfaceFlags interface = (*j)->get_interface_flags(scope);
394 if(!(*j)->in_loop && !(interface&OUTPUT))
395 source += format("\t%s;\n", (*j)->create_declaration());
398 source += format("\tfor(int i=0; i<%d; ++i)\n\t{\n", loop_size);
399 for(list<ShaderVariable *>::const_iterator j=loop_vars.begin(); j!=loop_vars.end(); ++j)
401 if((*j)->variable->scope==scope && !(*j)->inlined)
405 decl = (*j)->create_declaration(0, true);
408 decl = (*j)->resolved_name;
412 const char *oper = ((*j)->array_sum ? "+=" : "=");
413 source += format("\t\t%s %s %s;\n", decl, oper, (*j)->create_expression("i"));
416 InterfaceFlags interface = (*j)->get_interface_flags(scope);
419 string expr = ((*j)->inlined ? (*j)->create_expression("i") : (*j)->resolved_name+"[i]");
420 source += format("\t\t%c_%s[i] = %s;\n", interfaces[scope], (*j)->resolved_name, expr);
428 InterfaceFlags interface = (*i)->get_interface_flags(scope);
430 if((*i)->array_size>1)
432 if((*i)->variable->scope==scope || (interface&OUTPUT))
434 loop_size = (*i)->array_size;
435 loop_vars.push_back(*i);
440 if((*i)->variable->scope==scope && !(*i)->inlined)
442 string decl = ((interface&GOAL) ? (*i)->resolved_name : (*i)->create_declaration());
443 source += format("\t%s = %s;\n", decl, (*i)->create_expression());
446 if((interface&(OUTPUT|GOAL))==OUTPUT)
448 string expr = ((*i)->inlined ? (*i)->create_expression() : (*i)->resolved_name);
449 source += format("\t%c_%s = %s;\n", interfaces[scope], (*i)->resolved_name, expr);
458 bool ProgramBuilder::evaluate_flags(const char *flags) const
465 for(const char *i=flags; *i; ++i)
467 if(*i>='a' && *i<='z')
469 bool found = (feature_flags.find(*i)!=string::npos);
471 cond = (cond || found);
473 cond = (cond && !found);
475 cond = (cond && found);
485 ProgramBuilder::MatchType ProgramBuilder::name_match(const char *n1, const char *n2, const char **space)
492 if(*n1==*n2 || *n1=='z' || *n2=='z')
496 int side = (*n1=='z' ? 1 : 2);
509 else if(i>=zzz+3 || side!=zside)
519 return (!*n1 && !*n2) ? (zzz>=0 ? FUZZY : EXACT) : ((*n1=='[' || *n2=='[') ? ARRAY : NO_MATCH);
522 bool ProgramBuilder::parse_identifier(const char *ptr, unsigned &start, unsigned &length)
526 bool subscript = false;
527 for(const char *i=ptr;; ++i)
533 if(isalpha(*i) || *i=='_')
552 length = i+1-(ptr+start);
555 else if(!isalpha(*i) || i>ptr+start+length+1)
558 else if(!isalnum(*i) && *i!='_')
560 length = i-(ptr+start);
570 vector<string> ProgramBuilder::extract_identifiers(const char *expression)
572 vector<string> result;
573 const char *ptr = expression;
576 while(parse_identifier(ptr, start, length))
578 result.push_back(string(ptr+start, length));
584 string ProgramBuilder::replace_identifiers(const char *expression, const map<string, string> &replace_map)
587 const char *ptr = expression;
590 while(parse_identifier(ptr, start, length))
592 result.append(ptr, start);
593 string identifier(ptr+start, length);
594 map<string, string>::const_iterator i = replace_map.find(identifier);
595 if(i!=replace_map.end())
598 result += identifier;
606 ProgramBuilder::StandardFeatures::StandardFeatures():
615 legacy(!(get_glsl_version()>=Version(1, 30)))
618 string ProgramBuilder::StandardFeatures::create_flags() const
646 ProgramBuilder::ShaderVariable::ShaderVariable(const std::string &n):
650 fuzzy_space(name.find("zzz")!=string::npos),
654 inline_parens(false),
657 string::size_type bracket = name.find('[');
658 if(bracket!=string::npos)
659 array_subscript = name.substr(bracket+1, name.size()-bracket-2);
662 void ProgramBuilder::ShaderVariable::resolve(const VariableDefinition &var)
665 const char *space = 0;
666 MatchType match = name_match(var.name, resolved_name.c_str(), &space);
669 resolve_space(string(space, 3));
670 else if(match==ARRAY)
672 if(array_subscript.empty())
674 else if(var.scope==UNIFORM)
676 const char *bracket = strrchr(variable->type, '[');
678 array_subscript = string(bracket+1, strlen(bracket)-2);
683 void ProgramBuilder::ShaderVariable::resolve(ShaderVariable &var)
685 for(list<ShaderVariable *>::iterator i=referenced_by.begin(); i!=referenced_by.end(); ++i)
686 (*i)->update_reference(*this, var);
687 var.referenced_by.insert(var.referenced_by.end(), referenced_by.begin(), referenced_by.end());
690 void ProgramBuilder::ShaderVariable::resolve_space(const string &space)
694 resolved_space = space;
696 string::size_type zzz = resolved_name.find("zzz");
697 resolved_name.replace(zzz, 3, resolved_space);
700 // Resolving the space could have affected other variables that use this one
701 for(list<ShaderVariable *>::iterator i=referenced_by.begin(); i!=referenced_by.end(); ++i)
702 (*i)->resolve_space(space);
705 for(list<ShaderVariable *>::iterator i=referenced_vars.begin(); i!=referenced_vars.end(); ++i)
706 if((*i)->fuzzy_space)
707 (*i)->resolve_space(space);
710 void ProgramBuilder::ShaderVariable::resolve_array(const StandardFeatures &features, unsigned size_hint)
714 if(!array_sum && array_subscript.empty())
717 if(!array_subscript.empty())
719 string::size_type bracket = resolved_name.find('[');
720 if(bracket!=string::npos)
721 resolved_name = resolved_name.substr(0, bracket);
724 if(variable && variable->scope==UNIFORM)
726 if(array_subscript=="MAX_LIGHTS")
727 array_size = features.max_lights;
728 else if(isnumrc(array_subscript))
729 array_size = lexical_cast<unsigned>(array_subscript);
731 throw invalid_variable_definition("invalid array size");
736 for(list<ShaderVariable *>::const_iterator i=referenced_vars.begin(); i!=referenced_vars.end(); ++i)
739 array_size = (*i)->array_size;
744 if(!array_size && size_hint)
745 array_size = size_hint;
749 for(list<ShaderVariable *>::const_iterator i=referenced_vars.begin(); i!=referenced_vars.end(); ++i)
750 if(!(*i)->array_subscript.empty() && !(*i)->array_size)
751 (*i)->resolve_array(features, array_size);
755 void ProgramBuilder::ShaderVariable::add_reference(ShaderVariable &var)
757 referenced_vars.push_back(&var);
758 var.referenced_by.push_back(this);
759 if(var.fuzzy_space && !resolved_space.empty())
760 var.resolve_space(resolved_space);
763 void ProgramBuilder::ShaderVariable::update_reference(ShaderVariable &from, ShaderVariable &to)
765 replace(referenced_vars.begin(), referenced_vars.end(), &from, &to);
766 replace(referenced_by.begin(), referenced_by.end(), &from, &to);
767 if(from.fuzzy_space && !to.fuzzy_space && !to.resolved_space.empty())
768 resolve_space(to.resolved_space);
771 void ProgramBuilder::ShaderVariable::check_inline(bool allow_legacy, bool trivial_only)
773 if(variable->expression)
775 if(array_sum && array_size>1)
777 if(!allow_legacy && !strncmp(variable->expression, "gl_", 3))
780 // Never inline goal variables
781 if(referenced_by.empty())
784 // Inline an expression consisting of a single identifier
785 unsigned start, length;
786 if(parse_identifier(variable->expression, start, length))
787 if(start==0 && variable->expression[length]==0)
796 /* If all references to the variable come from arrays in the same scope
797 and of the same size, the variable can be embedded in the loop. */
798 in_loop = (array_size>1 && !array_sum);
799 for(list<ShaderVariable *>::const_iterator i=referenced_by.begin(); i!=referenced_by.end(); ++i)
800 if((*i)->variable->scope!=variable->scope || (*i)->array_size!=array_size)
803 /* Count all refs to this variable. Refs from array variables count once
804 per loop iteration. */
805 unsigned total_refs = 0;
806 unsigned in_scope_refs = 0;
807 for(list<ShaderVariable *>::const_iterator i=referenced_by.begin(); i!=referenced_by.end(); ++i)
809 unsigned count = max((*i)->array_size*!in_loop, 1U);
811 if((*i)->variable->scope==variable->scope)
812 in_scope_refs += count;
815 /* Inline if there's only one ref, or if all refs are in other scopes.
816 In the latter case, the actual inlining will happen in the interface
817 variable assignment. */
818 if(total_refs==1 || in_scope_refs==0)
822 for(const char *c=variable->expression; (!inline_parens && *c); ++c)
828 else if(level==0 && !isalnum(*c) && *c!='_' && *c!='.')
829 inline_parens = true;
835 bool ProgramBuilder::ShaderVariable::is_referenced_from(VariableScope scope) const
837 for(list<ShaderVariable *>::const_iterator i=referenced_by.begin(); i!=referenced_by.end(); ++i)
838 if((*i)->variable->scope==scope)
843 ProgramBuilder::InterfaceFlags ProgramBuilder::ShaderVariable::get_interface_flags(VariableScope scope) const
845 /* Uniforms are available to all stages and are not passed through
847 if(variable->scope==UNIFORM)
850 int flags = NO_INTERFACE;
852 for(list<ShaderVariable *>::const_iterator i=referenced_by.begin(); i!=referenced_by.end(); ++i)
854 /* Variables used in a later scope than they are declared in need to go
855 through the interface */
856 if((*i)->variable->scope>scope && variable->scope<=scope)
858 if((*i)->variable->scope>=scope && variable->scope<scope)
859 if(!inlined || variable->scope!=ATTRIBUTE || scope!=VERTEX)
863 // Variables without any references are goals and also outputs.
864 if(referenced_by.empty() && variable->scope==scope)
865 flags |= OUTPUT|GOAL;
867 return static_cast<InterfaceFlags>(flags);
870 string ProgramBuilder::ShaderVariable::create_declaration(char interface, bool loop) const
872 if(variable->scope==UNIFORM && !array_subscript.empty())
874 const char *bracket = strrchr(variable->type, '[');
876 return format("%s %s[%d]", string(variable->type, bracket), resolved_name, array_size);
880 if(!array_sum && array_size>1 && !loop)
881 array = format("[%d]", array_size);
884 return format("%s %c_%s%s", variable->type, interface, resolved_name, array);
886 return format("%s %s%s", variable->type, resolved_name, array);
889 string ProgramBuilder::ShaderVariable::create_replacement(VariableScope from_scope, const char *loop) const
891 string replacement = resolved_name;
892 InterfaceFlags interface = NO_INTERFACE;
895 interface = get_interface_flags(from_scope);
896 if((interface&INPUT) && interfaces[from_scope-1])
897 replacement = format("%c_%s", interfaces[from_scope-1], replacement);
900 replacement = create_expression(loop);
902 replacement = "("+replacement+")";
907 // Add an array subscript, unless the variable is embedded in a loop
908 if(!array_subscript.empty() && !in_loop)
911 return format("%s[%s]", replacement, loop);
912 else if(!variable || variable->scope==UNIFORM)
913 return replacement+"[0]";
919 string ProgramBuilder::ShaderVariable::create_expression(const char *loop) const
921 map<string, string> replace_map;
922 for(list<ShaderVariable *>::const_iterator i=referenced_vars.begin(); i!=referenced_vars.end(); ++i)
924 string replacement = (*i)->create_replacement(variable->scope, loop);
925 if(replacement!=(*i)->name)
926 replace_map[(*i)->name] = replacement;
929 if(replace_map.empty())
930 return variable->expression;
932 return replace_identifiers(variable->expression, replace_map);
936 ProgramBuilder::StandardFeatures::Loader::Loader(StandardFeatures &f):
937 DataFile::ObjectLoader<StandardFeatures>(f)
939 add("custom", &StandardFeatures::custom);
940 add("lighting", &StandardFeatures::lighting);
941 add("material", &StandardFeatures::material);
942 add("max_lights", &StandardFeatures::max_lights);
943 add("normalmap", &StandardFeatures::normalmap);
944 add("reflection", &StandardFeatures::reflection);
945 add("shadow", &StandardFeatures::shadow);
946 add("skylight", &StandardFeatures::skylight);
947 add("specular", &StandardFeatures::specular);
948 add("texture", &StandardFeatures::texture);