Eliminate the latency of button press recognition, which was bad enough to lose keys entirely sometimes, and could otherwise delay a button press or release by 200 ms.

This was the entire reason I created the fork, and I finally did it! It syncs the controls every scanline of a frame, which costs about 60,000 MIPS instructions per frame to deal with. Luckily, the processor runs at 396 MHz, which means the cost of checking the controls is 1% of the CPU's power.

3 files changed, 32 insertions, 31 deletions

diff --git a/source/nds/ds2_main.c b/source/nds/ds2_main.c
index 710215b..2d73313 100644
--- a/source/nds/ds2_main.c
+++ b/source/nds/ds2_main.c
@@ -15,19 +15,19 @@
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */

-

-#include <stdio.h>

-#include "console.h"

-#include "fs_api.h"

+ */
+
+#include <stdio.h>
+#include "console.h"
+#include "fs_api.h"
 #include "ds2io.h"
 #include "ds2_timer.h"
 #include "ds2_malloc.h"
-

-#define BLACK_COLOR		RGB15(0, 0, 0)

-#define WHITE_COLOR		RGB15(31, 31, 31)

-

-extern int sfc_main (int argc, char **argv);

+
+#define BLACK_COLOR		RGB15(0, 0, 0)
+#define WHITE_COLOR		RGB15(31, 31, 31)
+
+extern int sfc_main (int argc, char **argv);
 
 #if 0
 void ddump_mem(unsigned char* addr, unsigned int len)
@@ -42,24 +42,22 @@ void ddump_mem(unsigned char* addr, unsigned int len)
 }
 #endif
 
+void ds2_main(void)
+{
+	int err;
+ds2_setCPUclocklevel(13);
+	//Initial video and audio and other input and output
+	err = ds2io_initb(512, 22050, 0, 0);
+	if(err) goto _failure;
 
-

-void ds2_main(void)

-{

-	int err;

-ds2_setCPUclocklevel(13);

-	//Initial video and audio and other input and output

-	err = ds2io_initb(512, 22050, 0, 0);

-	if(err) goto _failure;

+	//Initial file system
+	err = fat_init();
+	if(err) goto _failure;
 
-	//Initial file system

-	err = fat_init();

-	if(err) goto _failure;

+	//go to user main funtion
+	sfc_main (0, 0);
 
-	//go to user main funtion

-	sfc_main (0, 0);

-

 _failure:
-	ds2_plug_exit();

-}

-

+	ds2_plug_exit();
+}
+
diff --git a/source/nds/entry.cpp b/source/nds/entry.cpp
index 24c0e03..467461b 100644
--- a/source/nds/entry.cpp
+++ b/source/nds/entry.cpp
@@ -90,6 +90,7 @@ void S9xParseDisplayArg (char **argv, int &ind, int)
 
 void S9xExit ()
 {
+  ds2_setCPUclocklevel(13); // Crank it up to exit quickly
   if(Settings.SPC7110)
     (*CleanUp7110)();
 
@@ -382,15 +383,15 @@ void init_sfc_setting(void)
     Settings.SixteenBit = TRUE;
 
     Settings.SupportHiRes = FALSE;
-    Settings.NetPlay = FALSE;
-    Settings.ServerName [0] = 0;
     Settings.ThreadSound = FALSE;
 	Settings.SoundSync = TRUE;
     Settings.AutoSaveDelay = 0;
 #ifdef _NETPLAY_SUPPORT
+    Settings.NetPlay = FALSE;
+    Settings.ServerName [0] = 0;
     Settings.Port = NP_DEFAULT_PORT;
 #endif
-    Settings.ApplyCheats =FALSE;
+    Settings.ApplyCheats = FALSE;
     Settings.TurboMode = FALSE;
     Settings.TurboSkipFrames = 40;
     Settings.StretchScreenshots = 1;
@@ -1009,7 +1010,8 @@ unsigned int S9xReadJoypad (int which1)
 			key |= (inputdata.key & (1<<i)) ? keymap[i] : 0;
 		}
 
-		return (key | 0x80000000);
+		// return (key | 0x80000000);
+		return key; // ??? [Neb]
 	}
 	else
 		return 0;
diff --git a/source/nds/gui.c b/source/nds/gui.c
index bf85b67..4a04efc 100644
--- a/source/nds/gui.c
+++ b/source/nds/gui.c
@@ -1714,6 +1714,7 @@ u32 menu(u16 *screen)
 
 	void menu_exit()
 	{
+		ds2_setCPUclocklevel(13); // Crank it up, leave quickly
         if(gamepak_name[0] != 0)
         {
 			game_config.clock_speed_number = clock_speed_number;