source/program.h

   1 #ifndef MSP_GL_PROGRAM_H_
   2 #define MSP_GL_PROGRAM_H_
   3
   4 #include <string>
   5 #include <vector>
   6 #include <msp/datafile/objectloader.h>
   7 #include "bindable.h"
   8 #include "gl.h"
   9 #include "programbuilder.h"
  10 #include "vertexformat.h"
  11
  12 namespace Msp {
  13 namespace GL {
  14
  15 class Shader;
  16
  17 /**
  18 A complete shader program.  Programs can be assembled of individual Shaders or
  19 generated with a set of standard features.
  20 */
  21 class Program: public Bindable<Program>
  22 {
  23 public:
  24         class Loader: public DataFile::ObjectLoader<Program>
  25         {
  26         public:
  27                 Loader(Program &);
  28
  29         private:
  30                 virtual void finish();
  31
  32                 void attribute(unsigned, const std::string &);
  33                 void fragment_shader(const std::string &);
  34                 void geometry_shader(const std::string &);
  35                 void standard();
  36                 void vertex_shader(const std::string &);
  37         };
  38
  39         typedef unsigned LayoutHash;
  40         struct UniformBlockInfo;
  41
  42         struct UniformInfo
  43         {
  44                 std::string name;
  45                 const UniformBlockInfo *block;
  46                 unsigned location;
  47                 unsigned size;
  48                 unsigned array_stride;
  49                 unsigned matrix_stride;
  50                 GLenum type;
  51         };
  52
  53         struct UniformBlockInfo
  54         {
  55                 std::string name;
  56                 unsigned data_size;
  57                 int bind_point;
  58                 std::vector<const UniformInfo *> uniforms;
  59                 LayoutHash layout_hash;
  60         };
  61
  62         typedef std::vector<Shader *> ShaderList;
  63         typedef std::map<std::string, UniformInfo> UniformMap;
  64         typedef std::map<std::string, UniformBlockInfo> UniformBlockMap;
  65
  66 private:
  67         unsigned id;
  68         ShaderList shaders;
  69         ShaderList owned_data;
  70         bool linked;
  71         UniformBlockMap uniform_blocks;
  72         UniformMap uniforms;
  73         LayoutHash uniform_layout_hash;
  74         bool legacy_vars;
  75
  76 public:
  77         /// Constructs an empty Program with no Shaders attached.
  78         Program();
  79
  80         /// Constructs a Program with standard features.
  81         Program(const ProgramBuilder::StandardFeatures &);
  82
  83         /// Constructs a Program from unified source code using ProgramCompiler.
  84         Program(const std::string &);
  85
  86         /// Constructs a Program from vertex and fragment shader source code.
  87         Program(const std::string &, const std::string &);
  88
  89 private:
  90         void init();
  91 public:
  92         virtual ~Program();
  93
  94         void attach_shader(Shader &shader);
  95         void attach_shader_owned(Shader *shader);
  96         void detach_shader(Shader &shader);
  97         const ShaderList &get_attached_shaders() const { return shaders; }
  98
  99         void bind_attribute(unsigned, const std::string &);
 100         void bind_attribute(VertexComponent, const std::string &);
 101         void bind_fragment_data(unsigned, const std::string &);
 102
 103         void link();
 104 private:
 105         static LayoutHash compute_layout_hash(const std::vector<const UniformInfo *> &);
 106         static bool uniform_location_compare(const UniformInfo *, const UniformInfo *);
 107 public:
 108         bool is_linked() const { return linked; }
 109         std::string get_info_log() const;
 110
 111         LayoutHash get_uniform_layout_hash() const { return uniform_layout_hash; }
 112         const UniformBlockMap &get_uniform_blocks() const { return uniform_blocks; }
 113         const UniformBlockInfo &get_uniform_block_info(const std::string &) const;
 114         const UniformMap &get_uniforms() const { return uniforms; }
 115         const UniformInfo &get_uniform_info(const std::string &) const;
 116         int get_uniform_location(const std::string &) const;
 117
 118         bool uses_legacy_variables() const { return legacy_vars; }
 119
 120         void bind() const;
 121         static void unbind();
 122 };
 123
 124 } // namespace GL
 125 } // namespace Msp
 126
 127 #endif