source/programbuilder.h

   1 #ifndef MSP_GL_PROGRAMBUILDER_H_
   2 #define MSP_GL_PROGRAMBUILDER_H_
   3
   4 #include <map>
   5 #include <string>
   6 #include <vector>
   7 #include <msp/datafile/objectloader.h>
   8
   9 namespace Msp {
  10 namespace GL {
  11
  12 class Program;
  13
  14 class invalid_variable_definition: public std::invalid_argument
  15 {
  16 public:
  17         invalid_variable_definition(const std::string &w): std::invalid_argument(w) { }
  18         virtual ~invalid_variable_definition() throw() { }
  19 };
  20
  21 class ProgramBuilder
  22 {
  23 public:
  24         struct StandardFeatures
  25         {
  26                 class Loader: public DataFile::ObjectLoader<StandardFeatures>
  27                 {
  28                 public:
  29                         Loader(StandardFeatures &);
  30                 };
  31
  32                 bool texture;
  33                 bool material;
  34                 bool lighting;
  35                 bool specular;
  36                 bool normalmap;
  37                 bool shadow;
  38                 bool reflection;
  39                 bool legacy;
  40                 std::string custom;
  41
  42                 StandardFeatures();
  43
  44                 std::string create_flags() const;
  45         };
  46
  47 private:
  48         enum VariableScope
  49         {
  50                 NO_SCOPE,
  51                 UNIFORM,
  52                 ATTRIBUTE,
  53                 VERTEX,
  54                 FRAGMENT
  55         };
  56
  57         enum InterfaceFlags
  58         {
  59                 NO_INTERFACE = 0,
  60                 INPUT = 1,
  61                 OUTPUT = 2,
  62                 PASSTHROUGH = INPUT|OUTPUT,
  63                 GOAL = 4
  64         };
  65
  66         struct VariableDefinition
  67         {
  68                 VariableScope scope;
  69                 const char *name;
  70                 const char *type;
  71                 const char *expression;
  72                 const char *flags;
  73         };
  74
  75         struct ShaderVariable
  76         {
  77                 std::string name;
  78                 const VariableDefinition *variable;
  79                 std::string resolved_name;
  80                 bool fuzzy_space;
  81                 std::string resolved_space;
  82                 std::list<ShaderVariable *> referenced_vars;
  83                 std::list<ShaderVariable *> referenced_by;
  84                 bool inlined;
  85                 bool inline_parens;
  86
  87                 ShaderVariable(const std::string &);
  88
  89                 void resolve(const VariableDefinition &);
  90                 void resolve(ShaderVariable &);
  91                 void resolve_space(const std::string &);
  92                 void add_reference(ShaderVariable &);
  93                 void update_reference(ShaderVariable &, ShaderVariable &);
  94                 void check_inline(bool, bool);
  95                 bool is_referenced_from(VariableScope) const;
  96                 InterfaceFlags get_interface_flags(VariableScope) const;
  97                 std::string create_declaration(char = 0) const;
  98                 std::string create_replacement(VariableScope) const;
  99                 std::string create_expression() const;
 100         };
 101
 102         enum MatchLevel
 103         {
 104                 NO_MATCH,
 105                 EXACT,
 106                 FUZZY
 107         };
 108
 109         StandardFeatures features;
 110         std::list<VariableDefinition> custom_variables;
 111         std::string feature_flags;
 112         bool optimize;
 113
 114         static const VariableDefinition standard_variables[];
 115         static const char interfaces[];
 116
 117 public:
 118         ProgramBuilder(const StandardFeatures &);
 119
 120         void set_optimize(bool);
 121         Program *create_program() const;
 122         void add_shaders(Program &) const;
 123 private:
 124         std::string create_source(const std::list<ShaderVariable *> &, VariableScope) const;
 125         bool evaluate_flags(const char *) const;
 126         static MatchLevel name_match(const char *, const char *, const char ** = 0);
 127         static bool parse_identifier(const char *, unsigned &, unsigned &);
 128         static std::vector<std::string> extract_identifiers(const char *);
 129         static std::string replace_identifiers(const char *, const std::map<std::string, std::string> &);
 130 };
 131
 132 } // namespace GL
 133 } // namespace Msp
 134
 135 #endif