src/graphics/buffer.hpp

   1 #ifndef BLOBS_GRAPHICS_BUFFER_HPP_
   2 #define BLOBS_GRAPHICS_BUFFER_HPP_
   3
   4 #include "../app/error.hpp"
   5
   6 #include <algorithm>
   7 #include <GL/glew.h>
   8
   9
  10 namespace blobs {
  11 namespace graphics {
  12
  13 template<class T>
  14 class MappedBuffer {
  15
  16 public:
  17         MappedBuffer(GLenum target, GLenum access)
  18         : buf(reinterpret_cast<T *>(glMapBuffer(target, access)))
  19         , target(target) {
  20                 if (!buf) {
  21                         throw app::GLError("failed to map buffer");
  22                 }
  23         }
  24         MappedBuffer()
  25         : buf(nullptr)
  26         , target(0) {
  27         }
  28         ~MappedBuffer() noexcept {
  29                 if (buf) {
  30                         glUnmapBuffer(target);
  31                 }
  32         }
  33
  34         MappedBuffer(MappedBuffer<T> &&other) noexcept
  35         : buf(other.buf)
  36         , target(other.target) {
  37                 other.buf = nullptr;
  38         }
  39         MappedBuffer<T> &operator =(MappedBuffer<T> &&other) noexcept {
  40                 std::swap(buf, other.buf);
  41                 std::swap(target, other.target);
  42         }
  43
  44         MappedBuffer(const MappedBuffer<T> &) = delete;
  45         MappedBuffer<T> &operator =(const MappedBuffer<T> &) = delete;
  46
  47         explicit operator bool() const noexcept { return buf; }
  48
  49 public:
  50         T &operator [](std::size_t i) noexcept { return buf[i]; }
  51         const T &operator [](std::size_t i) const noexcept { return buf[i]; }
  52
  53 private:
  54         T *buf;
  55         GLenum target;
  56
  57 };
  58
  59 }
  60 }
  61
  62 #endif