frame_buffer.h

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#pragma once
 
#include "graphics.h"
#include "texture.h"
#include <memory>
#include <vector>
 
namespace gfx
{
struct fbo_attachment
{
    std::shared_ptr<gfx::texture> texture;
    std::uint16_t mip = 0;
    std::uint16_t layer = 0;
 
    bool generate_mips{true};
};
 
struct frame_buffer : public handle_impl<frame_buffer, frame_buffer_handle>
{
    //-----------------------------------------------------------------------------
    //  Name : frame_buffer ()
    //-----------------------------------------------------------------------------
    frame_buffer() = default;
    //-----------------------------------------------------------------------------
    //  Name : frame_buffer ()
    //-----------------------------------------------------------------------------
    frame_buffer(std::uint16_t _width,
                 std::uint16_t _height,
                 texture_format _format,
                 std::uint32_t _texture_flags = BGFX_SAMPLER_U_CLAMP | BGFX_SAMPLER_V_CLAMP);
 
    //-----------------------------------------------------------------------------
    //  Name : frame_buffer ()
    //-----------------------------------------------------------------------------
    frame_buffer(const std::vector<texture::ptr>& textures);
 
    //-----------------------------------------------------------------------------
    //  Name : frame_buffer ()
    //-----------------------------------------------------------------------------
    frame_buffer(const std::vector<fbo_attachment>& textures);
 
    //-----------------------------------------------------------------------------
    //  Name : frame_buffer ()
    //-----------------------------------------------------------------------------
    frame_buffer(void* _nwh,
                 std::uint16_t _width,
                 std::uint16_t _height,
                 texture_format _format = texture_format::Count,
                 texture_format _depth_format = texture_format::Count);
 
    //-----------------------------------------------------------------------------
    //  Name : populate ()
    //-----------------------------------------------------------------------------
    void populate(const std::vector<texture::ptr>& textures);
    void populate(const std::vector<fbo_attachment>& textures);
 
    //-----------------------------------------------------------------------------
    //  Name : get_size ()
    //-----------------------------------------------------------------------------
    [[nodiscard]] auto get_size() const -> usize32_t;
 
    //-----------------------------------------------------------------------------
    //  Name : get_attachment ()
    //-----------------------------------------------------------------------------
    [[nodiscard]] auto get_attachment(std::uint32_t index = 0) const -> const fbo_attachment&;
    [[nodiscard]] auto get_attachments() const -> const std::vector<fbo_attachment>&;
    //-----------------------------------------------------------------------------
    //  Name : get_attachment ()
    //-----------------------------------------------------------------------------
    [[nodiscard]] auto get_texture(std::uint32_t index = 0) const -> const gfx::texture::ptr&;
 
    //-----------------------------------------------------------------------------
    //  Name : get_attachment_count ()
    //-----------------------------------------------------------------------------
    [[nodiscard]] auto get_attachment_count() const -> size_t;
 
private:
    usize32_t cached_size_ = {0, 0};
    std::vector<fbo_attachment> textures_;
};
 
 
inline auto needs_recreate(const gfx::frame_buffer::ptr& fbo, const usize32_t& size) -> bool
{
    return !fbo || (fbo && fbo->get_size() != size);
}
} // namespace gfx