From b277570daee54faf93804f5ae2d5e82e8fa11708 Mon Sep 17 00:00:00 2001
From: Nebuleon Fumika
Date: Wed, 6 Feb 2013 04:38:18 -0500
Subject: Quit saving the files so often for nothing; that uses up erase cycles
 on storage cards! Instead, save them once when the menu that contains the
 settings that the user changed is exited, IF the settings' values changed, OR
 once when updating the list of most-recently played games.

Automatically save the SRAM in most cases, including game changes.

This commit also makes it unnecessary to save the game config of the previous game when loading another, makes it load certain settings correctly, and MAY make it avoid creating a file for a game's settings if the user never changes them from the defaults.
---
 source/nds/gui.c | 58 +++++++++++++++++++++++++++-----------------------------
 1 file changed, 28 insertions(+), 30 deletions(-)

(limited to 'source')

diff --git a/source/nds/gui.c b/source/nds/gui.c
index 838b5b9..581c905 100644
--- a/source/nds/gui.c
+++ b/source/nds/gui.c
@@ -1718,6 +1718,9 @@ u32 menu(u16 *screen, bool8 FirstInvocation)
     u16 *bg_screenp;
     u32 bg_screenp_color;
 
+    GAME_CONFIG PreviousGameConfig;  // Compared with current settings to
+    EMU_CONFIG  PreviousEmuConfig;   // determine if they need to be saved
+
 	auto void choose_menu();
 	auto void menu_return();
 	auto void menu_exit();
@@ -1776,17 +1779,32 @@ u32 menu(u16 *screen, bool8 FirstInvocation)
 	void menu_exit()
 	{
 		HighFrequencyCPU(); // Crank it up, leave quickly
-        if(gamepak_name[0] != 0)
-        {
-            reorder_latest_file();
+		if(gamepak_name[0] != 0)
+		{
 			S9xAutoSaveSRAM ();
-			save_game_config_file();
 		}
-		save_emu_config_file();
 		quit();
 	}
 
+	void SaveConfigsIfNeeded()
+	{
+		if (memcmp(&PreviousGameConfig, &game_config, sizeof(GAME_CONFIG)) != 0)
+			save_game_config_file();
+		if (memcmp(&PreviousEmuConfig, &emu_config, sizeof(EMU_CONFIG)) != 0)
+			save_emu_config_file();
+	}
+
+	void PreserveConfigs()
+	{
+		memcpy(&PreviousGameConfig, &game_config, sizeof(GAME_CONFIG));
+		memcpy(&PreviousEmuConfig, &emu_config, sizeof(EMU_CONFIG));
+	}
+
   int LoadGameAndItsData(char *filename){
+    if (gamepak_name[0] != '\0') {
+      S9xAutoSaveSRAM();
+    }
+
     draw_message(down_screen_addr, bg_screenp, 28, 31, 227, 165, bg_screenp_color);
     draw_string_vcenter(down_screen_addr, 36, 100, 190, COLOR_MSSG, msg[MSG_PROGRESS_LOADING_GAME]);
     ds2_flipScreen(DOWN_SCREEN, DOWN_SCREEN_UPDATE_METHOD);
@@ -1819,6 +1837,8 @@ u32 menu(u16 *screen, bool8 FirstInvocation)
 
     first_load = 0;
     load_game_config_file();
+    PreserveConfigs(); // Make the emulator not save what we've JUST read
+    // but it will save the emulator configuration below for latest files
 
     return_value = 1;
     repeat = 0;
@@ -1834,12 +1854,6 @@ u32 menu(u16 *screen, bool8 FirstInvocation)
 	{
 		char *file_ext[] = { ".smc", ".sfc", ".zip", NULL };
 
-		if(gamepak_name[0] != 0)
-		{
-			S9xAutoSaveSRAM ();
-			save_game_config_file();
-		}
-
 		if(load_file(file_ext, tmp_filename, g_default_rom_dir) != -1)
 		{
 			strcpy(line_buffer, g_default_rom_dir);
@@ -2056,10 +2070,6 @@ u32 menu(u16 *screen, bool8 FirstInvocation)
 
 				ds2_flipScreen(DOWN_SCREEN, DOWN_SCREEN_UPDATE_METHOD);
 
-				//save game config
-				reorder_latest_file();
-				save_game_config_file();
-
 				SavedStateCacheInvalidate ();
 
 				mdelay(500); // let the progress message linger
@@ -2722,7 +2732,6 @@ u32 menu(u16 *screen, bool8 FirstInvocation)
 				ds2_flipScreen(UP_SCREEN, 1);
             }
 
-            save_emu_config_file();
             LowFrequencyCPU(); // and back down
             wait_Allkey_release(0);
         }
@@ -3459,12 +3468,6 @@ u32 menu(u16 *screen, bool8 FirstInvocation)
     {
 		char *ext_pos;
 
-		if(gamepak_name[0] != 0)
-		{
-			S9xAutoSaveSRAM ();
-			save_game_config_file();
-		}
-
 		if(bg_screenp != NULL) {
 			bg_screenp_color = COLOR16(43, 11, 11);
 		}
@@ -3521,11 +3524,13 @@ u32 menu(u16 *screen, bool8 FirstInvocation)
 		if(NULL != current_menu) {
 			if(current_menu->end_function)
 				current_menu->end_function();
+			SaveConfigsIfNeeded();
 		}
 
 		current_menu = new_menu;
 		current_option_num= current_menu -> focus_option;
 		current_option = new_menu->options + current_option_num;
+		PreserveConfigs();
 		if(current_menu->init_function)
 			current_menu->init_function();
 	}
@@ -4038,18 +4043,11 @@ u32 menu(u16 *screen, bool8 FirstInvocation)
 
 	if (current_menu && current_menu->end_function)
 		current_menu->end_function();
+	SaveConfigsIfNeeded();
 
 	destroy_dynamic_cheats();
 	if(bg_screenp != NULL) free((void*)bg_screenp);
 
-	if(gamepak_name[0] != 0)
-	{
-		reorder_latest_file();
-		S9xAutoSaveSRAM ();
-		save_game_config_file();
-	}
-	save_emu_config_file();
-
 	ds2_clearScreen(DOWN_SCREEN, 0);
 	ds2_flipScreen(DOWN_SCREEN, DOWN_SCREEN_UPDATE_METHOD);
 	copy_screen(up_screen_addr, (void*) screen, 0, 0, 256, 192);
-- 
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