VertexBuffer.hpp

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#ifndef GALAXY_GRAPHICS_GL_VERTEXBUFFER_HPP_
#define GALAXY_GRAPHICS_GL_VERTEXBUFFER_HPP_
 
#include <span>
 
#include "galaxy/graphics/gl/Vertex.hpp"
 
namespace galaxy
{
    class VertexBuffer final
    {
    public:
        VertexBuffer();
 
        VertexBuffer(VertexBuffer&&) noexcept;
 
        VertexBuffer& operator=(VertexBuffer&&) noexcept;
 
        ~VertexBuffer();
 
        void buffer(std::span<Vertex> vertices, std::span<unsigned int> indices);
 
        void reserve(const int vertex_count, const int index_count);
 
        void sub_buffer(
            const unsigned int      vi,
            const int               vertex_size,
            const std::span<Vertex> vertices,
            const unsigned int      ei,
            const int               index_size,
            std::span<unsigned int> indices
        ) const;
 
        void sub_buffer_vertices(const unsigned int vi, const int vertex_size, const std::span<Vertex> vertices) const;
 
        void sub_buffer_indices(const unsigned int ei, const int index_size, std::span<unsigned int> indices) const;
 
        void erase(const unsigned int vi, const int vertex_count, const unsigned int ei, const int index_count) const;
 
        void clear() const;
 
        [[nodiscard]]
        int count() const noexcept;
 
        [[nodiscard]]
        void* offset() noexcept;
 
        [[nodiscard]]
        unsigned int id() const noexcept;
 
    private:
        VertexBuffer(const VertexBuffer&) = delete;
        VertexBuffer& operator=(const VertexBuffer&) = delete;
 
    private:
        unsigned int m_id;
 
        std::size_t m_offset;
 
        int m_count;
    };
} // namespace galaxy
 
#endif