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 ProgramBuilder
  15 {
  16 public:
  17         struct StandardFeatures
  18         {
  19                 class Loader: public DataFile::ObjectLoader<StandardFeatures>
  20                 {
  21                 public:
  22                         Loader(StandardFeatures &);
  23                 };
  24
  25                 bool texture;
  26                 bool material;
  27                 bool lighting;
  28                 bool specular;
  29                 bool normalmap;
  30                 bool shadow;
  31                 bool reflection;
  32                 bool transform;
  33
  34                 StandardFeatures();
  35
  36                 std::string create_flags() const;
  37         };
  38
  39         enum VariableScope
  40         {
  41                 NO_SCOPE,
  42                 UNIFORM,
  43                 ATTRIBUTE,
  44                 VERTEX,
  45                 FRAGMENT
  46         };
  47
  48 private:
  49         struct StandardVariable
  50         {
  51                 VariableScope scope;
  52                 const char *name;
  53                 const char *type;
  54                 const char *expression;
  55                 const char *flags;
  56         };
  57
  58         struct ShaderVariable
  59         {
  60                 std::string name;
  61                 const StandardVariable *variable;
  62                 std::string resolved_name;
  63                 bool fuzzy_space;
  64                 std::string resolved_space;
  65                 std::list<ShaderVariable *> referenced_vars;
  66                 std::list<ShaderVariable *> referenced_by;
  67                 bool inlined;
  68                 bool inline_parens;
  69
  70                 ShaderVariable(const std::string &);
  71
  72                 void resolve(const StandardVariable &);
  73                 void resolve(ShaderVariable &);
  74                 void resolve_space(const std::string &);
  75                 void add_reference(ShaderVariable &);
  76                 void update_reference(ShaderVariable &, ShaderVariable &);
  77                 void check_inline();
  78                 bool is_referenced_from(VariableScope) const;
  79                 std::string get_expression() const;
  80         };
  81
  82         enum MatchLevel
  83         {
  84                 NO_MATCH,
  85                 EXACT,
  86                 FUZZY
  87         };
  88
  89         StandardFeatures features;
  90         std::string feature_flags;
  91         bool optimize;
  92
  93         static const StandardVariable standard_variables[];
  94
  95 public:
  96         ProgramBuilder(const StandardFeatures &);
  97
  98         void set_optimize(bool);
  99         Program *create_program() const;
 100         void add_shaders(Program &) const;
 101 private:
 102         std::string create_source(const std::list<ShaderVariable *> &, VariableScope) const;
 103         bool evaluate_flags(const char *) const;
 104         static MatchLevel name_match(const char *, const char *, const char ** = 0);
 105         static bool parse_identifier(const char *, unsigned &, unsigned &);
 106         static std::vector<std::string> extract_identifiers(const char *);
 107         static std::string replace_identifiers(const char *, const std::map<std::string, std::string> &);
 108 };
 109
 110 } // namespace GL
 111 } // namespace Msp
 112
 113 #endif