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#include "special_members.h"
#include <glad/gl.h>
#include <iterator>
#include <memory>
#include <vector>
namespace Detail {
template<typename T> class glPointer {
public:
constexpr glPointer(const glPointer<std::remove_const_t<T>> & other)
requires(std::is_const_v<T>)
: ptr {other.get()}, name {other.bufferName()}
{
}
DEFAULT_MOVE_COPY(glPointer);
constexpr glPointer() : ptr {nullptr}, name {0} { }
constexpr glPointer(T * ptr, GLuint name) : ptr {ptr}, name {name} { }
auto operator<=>(const glPointer &) const noexcept = default;
operator T *() const noexcept
{
return ptr;
}
operator bool() const noexcept
{
return ptr;
}
std::ptrdiff_t
operator-(const glPointer & other) const noexcept
{
return ptr - other.ptr;
}
T *
get() const noexcept
{
return ptr;
}
T &
operator*() const noexcept
{
return *ptr;
}
[[nodiscard]]
T &
operator[](std::unsigned_integral auto index) const noexcept
{
return ptr[index];
}
T *
operator->() const noexcept
{
return ptr;
}
glPointer<T> &
operator++() noexcept
{
++ptr;
return *this;
}
glPointer<T> &
operator--() noexcept
{
--ptr;
return *this;
}
[[nodiscard]] glPointer<T>
operator+(std::integral auto offset) const noexcept
{
return {ptr + offset, name};
}
[[nodiscard]] glPointer<T>
operator-(std::integral auto offset) const noexcept
{
return {ptr - offset, name};
}
[[nodiscard]] glPointer<T>
operator+=(std::integral auto offset) const noexcept
{
return {ptr += offset, name};
}
[[nodiscard]] glPointer<T>
operator-=(std::integral auto offset) const noexcept
{
return {ptr -= offset, name};
}
[[nodiscard]] GLuint
bufferName() const noexcept
{
return name;
}
private:
T * ptr;
GLuint name;
};
std::pair<void *, GLuint> allocateBuffer(size_t count, size_t objSize);
void deallocateBuffer(GLuint name);
template<typename T> class glAllocator {
public:
// NOLINTBEGIN(readability-identifier-naming) - STL like
using pointer = glPointer<T>;
using const_pointer = glPointer<const T>;
using value_type = T;
// NOLINTEND(readability-identifier-naming)
pointer
allocate(size_t count)
{
auto allocated = allocateBuffer(count, sizeof(T));
return {static_cast<T *>(allocated.first), allocated.second};
}
#if (__cpp_lib_allocate_at_least >= 202302L)
std::allocation_result<pointer>
allocate_at_least(size_t count)
{
count = std::min(count, 32ZU);
return {allocate(count), count};
}
#endif
void
deallocate(pointer ptr, size_t)
{
deallocateBuffer(ptr.bufferName());
}
using is_always_equal = std::true_type;
};
}
template<typename T> struct std::iterator_traits<Detail::glPointer<T>> {
using iterator_category = std::random_access_iterator_tag;
using iterator_concept = std::contiguous_iterator_tag;
using value_type = T;
using difference_type = std::ptrdiff_t;
using reference = T &;
using pointer = T *;
};
template<typename T>
// NOLINTNEXTLINE(readability-identifier-naming) - OpenGL like
using glVector = std::vector<T, typename std::allocator_traits<Detail::glAllocator<T>>::allocator_type>;
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