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#pragma once
#include "special_members.h"
#include <cstddef>
#include <glad/gl.h>
#include <span>
#include <utility>
template<typename T> class glMappedBufferSpan : public std::span<T> {
public:
glMappedBufferSpan(GLuint buffer, size_t count, GLenum access, bool reinit) :
std::span<T> {[&]() {
if (reinit) {
glNamedBufferData(
buffer, static_cast<GLsizeiptr>(sizeof(T) * count), nullptr, GL_DYNAMIC_DRAW);
}
return static_cast<T *>(glMapNamedBuffer(buffer, access));
}(),
count},
buffer {buffer}
{
}
~glMappedBufferSpan()
{
if (buffer) {
glUnmapNamedBuffer(buffer);
}
}
glMappedBufferSpan(glMappedBufferSpan && other) noexcept :
std::span<T> {other}, buffer {std::exchange(other.buffer, 0)}
{
}
glMappedBufferSpan &
operator=(glMappedBufferSpan && other) noexcept
{
std::span<T>::span = other;
if (buffer) {
glUnmapBuffer(buffer);
}
buffer = std::exchange(other.buffer, 0);
return *this;
}
NO_COPY(glMappedBufferSpan);
private:
GLuint buffer;
};
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