SDLOutputSurface.hh

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#ifndef SDLOUTPUTSURFACE_HH
#define SDLOUTPUTSURFACE_HH
 
#include "OutputSurface.hh"
#include <cassert>
#include <concepts>
#include <span>
#include <SDL.h>
 
namespace openmsx {
 
class SDLDirectPixelAccess
{
public:
        SDLDirectPixelAccess(SDL_Surface* surface_);
        ~SDLDirectPixelAccess();
 
        template<std::unsigned_integral Pixel>
        [[nodiscard]] std::span<Pixel> getLine(unsigned y) {
                return {reinterpret_cast<Pixel*>(static_cast<char*>(surface->pixels) + y * surface->pitch),
                        size_t(surface->w)};
        }
 
private:
        SDL_Surface* surface;
};
 
class SDLOutputSurface : public OutputSurface
{
public:
        SDLOutputSurface(const SDLOutputSurface&) = delete;
        SDLOutputSurface& operator=(const SDLOutputSurface&) = delete;
 
        [[nodiscard]] SDL_Surface*  getSDLSurface()  const { return surface; }
        [[nodiscard]] SDL_Renderer* getSDLRenderer() const { return renderer; }
 
        [[nodiscard]] SDLDirectPixelAccess getDirectPixelAccess()
        {
                return {getSDLSurface()};
        }
 
        virtual void flushFrameBuffer() {}
 
        virtual void clearScreen() {}
 
protected:
        SDLOutputSurface() = default;
 
        void setSDLPixelFormat(const SDL_PixelFormat& format);
        void setSDLSurface(SDL_Surface* surface_) { surface = surface_; }
        void setSDLRenderer(SDL_Renderer* r) { renderer = r; }
 
private:
        SDL_Surface* surface = nullptr;
        SDL_Renderer* renderer = nullptr;
};
 
} // namespace openmsx
 
#endif