no loading between levels, many improvements in code

platform/sdl/BGraph2.cpp

@@ -89,13 +89,13 @@ int DxGetResY() {
 void setvesa_displaystart(int x,int y){
 
 }
-void StripBlt(void *data, unsigned int startline, uint32_t width) {
+void StripBlt(const void *data, unsigned int startline, uint32_t width) {
 
     unsigned short *start=startline*GetScreenPitch()+GetScreenAdr();
     while (width--)
     {
       memcpy(start,data,640*2);
-      data=(void *)(reinterpret_cast<short *>(data)+GetScreenPitch());
+      data=(void *)(reinterpret_cast<const short *>(data)+GetScreenPitch());
       start=start+GetScreenPitch();
     }
 
@@ -214,6 +214,12 @@ void DxDoneTurn(void *handle) {
     sdl.swap_display_buffers(); //present hidden buffer
 
 }
-void DxTurnLeftRight(char right, float phase, int border, int ypos, int *last) {
 
+
+char  game_display_is_quit_requested() {
+    return get_sdl_global_context().is_quit_requested()?1:0;
+}
+
+void game_display_cancel_quit_request() {
+    return get_sdl_global_context().cancel_quit_request();
 }

platform/sdl/BGraph2.h

@@ -21,8 +21,8 @@ void RedirectScreenBufferSecond(void);
 char game_display_init(const INI_CONFIG_SECTION *display_section, const char *title);
 void game_display_close(void);
 void game_display_update_rect(unsigned short x,unsigned short y,unsigned short xs,unsigned short ys);
-
-
+char game_display_is_quit_requested();
+void game_display_cancel_quit_request();
 
 void *DxPrepareWalk(int ypos);
 void DxZoomWalk(void *handle, int ypos, int *points,float phase, void *lodka);
@@ -49,7 +49,7 @@ void DXMouseTransform(unsigned short *x, unsigned short *y);
 //HWND GetGameWindow();
 //void DxLockBuffers(BOOL lock);
 
-void StripBlt(void *data, unsigned int startline, uint32_t width);
+void StripBlt(const void *data, unsigned int startline, uint32_t width);
 
 
 #ifdef __cplusplus

platform/sdl/keyboard_map.h

@@ -125,7 +125,8 @@ constexpr auto  sdl_keycode_map =  KeyCodeMap({
     {SDL_SCANCODE_KP_8,0x4838,0x4800,0x8D00},
     {SDL_SCANCODE_KP_9,0x4939,0x4900,0x8400},
     {SDL_SCANCODE_KP_0,0x5230,0x5200,0x9200},
-    {SDL_SCANCODE_KP_PERIOD,0x532E,0x5300,0x9300}
+    {SDL_SCANCODE_KP_PERIOD,0x532E,0x5300,0x9300},
+    {SDL_SCANCODE_KP_ENTER,0x1C0D,0x1C0D,0x1C0D}
 });
 
 

platform/sdl/sdl_context.cpp

@@ -186,16 +186,13 @@ void SDLContext::event_loop(std::stop_token stp) {
     SDL_Event e;
     while (SDL_WaitEvent(&e)) {
         if (e.type == SDL_QUIT) {
-            return;
-        }
-        if (e.type == exit_loop_event) {
-            return;
-        }
-        if (e.type == _update_request_event) {
+            _quit_requested = true;
+            if (_quit_callback) _quit_callback();
+        } else if (e.type == exit_loop_event) {
+            break;
+        } else if (e.type == _update_request_event) {
             update_screen();
-        }
-
-         if (e.type == SDL_WINDOWEVENT) {
+        } else if (e.type == SDL_WINDOWEVENT) {
                 if (e.window.event == SDL_WINDOWEVENT_SIZE_CHANGED) {
                     _crt_effect.reset();
                 }
@@ -501,7 +498,7 @@ SDL_Rect SDLContext::to_window_rect(const SDL_Rect &winrc, const SDL_Rect &sourc
     SDL_Point wpt1(to_window_point(winrc, pt1));
     SDL_Point wpt2(to_window_point(winrc, pt2));
     return {wpt1.x, wpt1.y, wpt2.x - wpt1.x, wpt2.y - wpt1.y};
-
-
-
+}
+void SDLContext::set_quit_callback(std::function<void()> fn) {
+    _quit_callback = std::move(fn);
 }

platform/sdl/sdl_context.h

@@ -6,6 +6,7 @@
 #include <thread>
 #include <vector>
 #include <libs/mouse.h>
+#include <functional>
 
 #include <queue>
 
@@ -38,6 +39,7 @@ public:
     void show_slide_transition(const SDL_Rect &visible_from, const SDL_Rect &visible_where,
                                const SDL_Rect &hidden_from, const SDL_Rect &hidden_where);
 
+    void set_quit_callback(std::function<void()> fn);
     MS_EVENT getMsEvent()  {
         std::lock_guard _(_mx);
         MS_EVENT out = ms_event;
@@ -58,6 +60,12 @@ public:
     bool is_keyboard_ready() const;
     std::uint16_t pop_keyboard_code() ;
 
+    bool is_quit_requested() const {
+        return _quit_requested;
+    }
+    void cancel_quit_request() {
+        _quit_requested = false;
+    }
 
 protected:
 
@@ -97,6 +105,7 @@ protected:
     int aspect_x = 4;
     int aspect_y = 3;
     bool crt_filter_enabled = false;
+    std::function<void()> _quit_callback;
 
     std::unique_ptr<SDL_Window, SDL_Deleter> _window;
     std::unique_ptr<SDL_Renderer, SDL_Deleter> _renderer;
@@ -108,12 +117,12 @@ protected:
 
     std::jthread _render_thread;
 
-    bool _quit_requested = false;
     bool _fullscreen_mode = false;
     bool _present = false;
     std::atomic<bool> _key_control = false;
     std::atomic<bool> _key_shift = false;
     std::atomic<bool> _key_capslock = false;
+    std::atomic<bool> _quit_requested = false;
 
 
     std::vector<char> _display_update_queue;

platform/sdl/sound.cpp

@@ -11,7 +11,7 @@ char start_mixing() {
 void stop_mixing() {
 
 }
-void play_sample(int channel,void *sample,int32_t size,int32_t lstart,int32_t sfreq,int type) {
+void play_sample(int channel,const void *sample,int32_t size,int32_t lstart,int32_t sfreq,int type) {
 
 }
 void set_channel_volume(int channel,int left,int right) {
@@ -50,7 +50,7 @@ void mute_channel(int channel) {
 void chan_break_loop(int channel) {
 
 }
-void chan_break_ext(int channel,void *org_sample,int32_t size_sample) {
+void chan_break_ext(int channel,const void *org_sample,int32_t size_sample) {
 
 }
 
@@ -67,7 +67,7 @@ int  get_snd_effect(int funct) {
 void *PrepareVideoSound(int mixfreq, int buffsize) {
     return 0;
 }
-char LoadNextVideoFrame(void *buffer, char *data, int size, short *xlat, short *accnums, int32_t *writepos) {
+char LoadNextVideoFrame(void *buffer, const char *data, int size, const short *xlat, short *accnums, int32_t *writepos) {
     std::this_thread::sleep_for(std::chrono::milliseconds(20));
     return 1;