Added savestate autoload/autosave feature

Author: hi-ban

dist/manual.txt

@@ -39,8 +39,11 @@ saving states.
 The default slot is always Slot 0.
 
 The default slot will always be selected when
-starting the emulator. Selected savestate slot 
-will not be saved on emulator exit.
+starting the emulator. The slot selection will
+not be saved on emulator exit.
+
+The default slot will be used by the savestate
+autosave/autoload feature when enabled.
 
 
 Emulator Options
@@ -74,9 +77,15 @@ Here is a list of the available config options:
     with the same name as the ROM file, and it
     will load the default border if it fails.
 
-- System:
-    Allows to select the system priority when
+- System Priority:
+    Allows to select the system to use when
     a ROM supports both DMG and GBC modes.
+    Default is "GBC".
+
+- Savestates:
+    Allows to set savestate related options,
+    like autoload on game boot and autosave
+    on game exit.
 
 - Boot Logos:
     Allows to use GB/GBC BIOS files to display
@@ -88,7 +97,8 @@ Here is a list of the available config options:
     Default is "DMG only".
 
 - Controls:
-    Allows the user to tune the controls.
+    Allows the user to tune the control related
+    settings.
 
 - Sound:
     Allows the user to select between Mono and

gambatte_sdl/builddate.h

@@ -1 +1 @@
-#define BUILDDATE "20210421-010751"
+#define BUILDDATE "20210731-123313"

gambatte_sdl/libmenu.cpp

@@ -56,7 +56,7 @@ Mix_Chunk *menusound_move = NULL;
 Mix_Chunk *menusound_ok = NULL;
 
 // Default config values
-int showfps = 0, ghosting = 1, biosenabled = 0, colorfilter = 0, gameiscgb = 0, buttonlayout = 0, stereosound = 1, prefercgb = 0, ffwhotkey = 1;
+int showfps = 0, ghosting = 1, biosenabled = 0, colorfilter = 0, gameiscgb = 0, buttonlayout = 0, stereosound = 1, prefercgb = 1, ffwhotkey = 1, stateautoload = 0, stateautosave = 0;
 uint32_t menupalblack = 0x000000, menupaldark = 0x505450, menupallight = 0xA8A8A8, menupalwhite = 0xF8FCF8;
 int filtervalue[12] = {135, 20, 0, 25, 0, 125, 20, 25, 0, 20, 105, 30};
 std::string selectedscaler= "No Scaling", dmgbordername = "DEFAULT", gbcbordername = "DEFAULT", palname = "DEFAULT", filtername = "NONE", currgamename = "default";
@@ -441,6 +441,60 @@ int textanim_reset(){
 	return 0;
 }
 
+void stateload_dms(int saveslot) {
+    gambatte_p->selectState_NoOsd(saveslot);
+    char overlaytext[20];
+    if(gambatte_p->loadState_NoOsd()){
+        can_reset = 1;//allow user to reset or save state once a savestate is loaded
+        sprintf(overlaytext, "State %d loaded", gambatte_p->currentState());
+        printOverlay(overlaytext);//print overlay text
+    } else {
+        sprintf(overlaytext, "State %d empty", gambatte_p->currentState());
+        printOverlay(overlaytext);//print overlay text
+    }
+}
+
+void statesave_dms(int saveslot) {
+    gambatte_p->selectState_NoOsd(saveslot);
+    if(can_reset == 1){//boot logo already ended, can save state safely
+        if(gameiscgb == 0){ //set palette to greyscale
+            Uint32 value;
+            for (int i = 0; i < 3; ++i) {
+                for (int k = 0; k < 4; ++k) {
+                    if(k == 0)
+                        value = 0xF8FCF8;
+                    if(k == 1)
+                        value = 0xA8A8A8;
+                    if(k == 2)
+                        value = 0x505450;
+                    if(k == 3)
+                        value = 0x000000;
+                    gambatte_p->setDmgPaletteColor(i, k, value);
+                }
+            }
+        } else { // disable color filter
+            gambatte_p->setColorFilter(0, filtervalue);
+        }
+        //run the emulator for 1 frame, so the screen buffer is updated without color palettes
+        std::size_t fakesamples = 35112;
+        Array<Uint32> const fakeBuf(35112 + 2064);
+        gambatte_p->runFor(blitter_p->inBuf().pixels, blitter_p->inBuf().pitch, fakeBuf, fakesamples);
+        //save state. the snapshot will now be in greyscale
+        gambatte_p->saveState_NoOsd(blitter_p->inBuf().pixels, blitter_p->inBuf().pitch);
+        if(gameiscgb == 0){
+            loadPalette(palname); //restore palette
+        } else {
+            loadFilter(filtername); //restore color filter
+        }
+
+        char overlaytext[14];
+        sprintf(overlaytext, "State %d saved", gambatte_p->currentState());
+        printOverlay(overlaytext);//print overlay text
+    } else if (can_reset == 0){//boot logo is still running, can't save state
+        printOverlay("Unable to save");//print overlay text
+    }
+}
+
 int menu_main(menu_t *menu) {
     SDL_Event event;
 	int dirty, loop, i;
@@ -2208,6 +2262,8 @@ void saveConfig(int pergame){
 		"DMGBORDERNAME %s\n"
 		"GBCBORDERNAME %s\n"
 		"PREFERCGB %d\n"
+		"STATEAUTOLOAD %d\n"
+		"STATEAUTOSAVE %d\n"
 		"BIOSENABLED %d\n"
 		"GHOSTING %d\n"
 		"BUTTONLAYOUT %d\n"
@@ -2220,6 +2276,8 @@ void saveConfig(int pergame){
 		dmgbordername.c_str(),
 		gbcbordername.c_str(),
 		prefercgb,
+		stateautoload,
+		stateautosave,
 		biosenabled,
 		ghosting,
 		buttonlayout,
@@ -2324,6 +2382,12 @@ void loadConfig(){
 		} else if (!strcmp(line, "PREFERCGB")) {
 			sscanf(arg, "%d", &value);
 			prefercgb = value;
+		} else if (!strcmp(line, "STATEAUTOLOAD")) {
+			sscanf(arg, "%d", &value);
+			stateautoload = value;
+		} else if (!strcmp(line, "STATEAUTOSAVE")) {
+			sscanf(arg, "%d", &value);
+			stateautosave = value;
 		} else if (!strcmp(line, "BIOSENABLED")) {
 			sscanf(arg, "%d", &value);
 			biosenabled = value;

gambatte_sdl/libmenu.h

@@ -109,7 +109,7 @@ extern SDL_Surface *menuscreen;
 extern SDL_Surface *surface_menuinout;
 extern SDL_Surface *textoverlay;
 extern SDL_Surface *textoverlaycolored;
-extern int showfps, ghosting, biosenabled, colorfilter, gameiscgb, buttonlayout, stereosound, prefercgb, ffwhotkey;
+extern int showfps, ghosting, biosenabled, colorfilter, gameiscgb, buttonlayout, stereosound, prefercgb, ffwhotkey, stateautoload, stateautosave;
 extern uint32_t menupalblack, menupaldark, menupallight, menupalwhite;
 extern int filtervalue[12];
 extern std::string selectedscaler, dmgbordername, gbcbordername, palname, filtername, currgamename, homedir, ipuscaling;
@@ -185,6 +185,9 @@ void apply_cfilter(SDL_Surface *surface);
 void printOverlay(const char *text);
 void clearAllCheats();
 
+void stateload_dms(int saveslot);
+void statesave_dms(int saveslot);
+
 #ifdef MIYOO_BATTERY_WARNING
 void checkBatt();
 #endif