src/graphicsbuffer.h

   1 #ifndef _GRAPHICSBUFFER_H
   2 #define _GRAPHICSBUFFER_H
   3
   4 #include <SDL.h>
   5 #include "gl_core44.h"
   6
   7
   8 namespace IPDF
   9 {
  10         /*
  11          * Implementation of an OpenGL buffer, with some extra cleverness.
  12          */
  13         class GraphicsBuffer
  14         {
  15         public:
  16                 enum BufferType
  17                 {
  18                         BufferTypeVertex,               // A Vertex Buffer
  19                         BufferTypeIndex,                // An Index Buffer
  20                         BufferTypePixelPack,            // Pixel Pack buffer
  21                         BufferTypePixelUnpack,
  22                         BufferTypeUniform,              // Uniform/Constant buffer
  23                         BufferTypeDrawIndirect,
  24                 };
  25
  26                 enum BufferUsage
  27                 {
  28                         BufferUsageStaticDraw,
  29                         BufferUsageStaticRead,
  30                         BufferUsageStaticCopy,
  31                         BufferUsageDynamicDraw,
  32                         BufferUsageDynamicRead,
  33                         BufferUsageDynamicCopy,
  34                         BufferUsageStreamDraw,
  35                         BufferUsageStreamRead,
  36                         BufferUsageStreamCopy
  37                 };
  38
  39                 GraphicsBuffer();
  40                 ~GraphicsBuffer();
  41
  42                 void SetType(BufferType bufType);
  43                 void SetUsage(BufferUsage bufUsage);
  44
  45                 void *Map(bool read, bool write, bool invalidate);
  46                 void *MapRange(int offset, int length, bool read, bool write, bool invalidate);
  47
  48                 void UnMap();
  49
  50                 void Upload(size_t length, const void *data);
  51                 void UploadRange(size_t length, intptr_t offset, const void *data);
  52
  53                 void Resize(size_t length);
  54                 const size_t GetSize() const { return m_buffer_size; }
  55
  56                 void Invalidate();
  57
  58                 void Bind() const;
  59         private:
  60                 void RecreateBuffer();
  61                 GLuint m_buffer_handle;
  62                 BufferType m_buffer_type;
  63                 BufferUsage m_buffer_usage;
  64                 void *m_map_pointer;
  65                 size_t m_buffer_size;
  66                 bool m_invalidated;
  67                 bool m_buffer_shape_dirty;
  68         };
  69
  70 }
  71
  72 #endif // _SCREEN_H