src/graphics/buffer.hpp

   1 #ifndef TACOS_GRAPHICS_BUFFER_HPP_
   2 #define TACOS_GRAPHICS_BUFFER_HPP_
   3
   4 #include "../app/error.hpp"
   5
   6 #include <algorithm>
   7 #include <GL/glew.h>
   8
   9
  10 namespace tacos {
  11
  12 template<class T>
  13 class MappedBuffer {
  14
  15 public:
  16         MappedBuffer(GLenum target, GLenum access)
  17         : buf(reinterpret_cast<T *>(glMapBuffer(target, access)))
  18         , target(target) {
  19                 if (!buf) {
  20                         throw GLError("failed to map buffer");
  21                 }
  22         }
  23         MappedBuffer()
  24         : buf(nullptr)
  25         , target(0) {
  26         }
  27         ~MappedBuffer() noexcept {
  28                 if (buf) {
  29                         glUnmapBuffer(target);
  30                 }
  31         }
  32
  33         MappedBuffer(MappedBuffer<T> &&other) noexcept
  34         : buf(other.buf)
  35         , target(other.target) {
  36                 other.buf = nullptr;
  37         }
  38         MappedBuffer<T> &operator =(MappedBuffer<T> &&other) noexcept {
  39                 std::swap(buf, other.buf);
  40                 std::swap(target, other.target);
  41         }
  42
  43         MappedBuffer(const MappedBuffer<T> &) = delete;
  44         MappedBuffer<T> &operator =(const MappedBuffer<T> &) = delete;
  45
  46         explicit operator bool() const noexcept { return buf; }
  47
  48 public:
  49         T &operator [](std::size_t i) noexcept { return buf[i]; }
  50         const T &operator [](std::size_t i) const noexcept { return buf[i]; }
  51
  52 private:
  53         T *buf;
  54         GLenum target;
  55
  56 };
  57
  58 }
  59
  60 #endif