Create cpu_pause and implement (libretro#507)

src/cpuexec.c

@@ -452,6 +452,10 @@ static void watchdog_reset(void)
 	watchdog_counter = 3 * Machine->drv->frames_per_second;
 }
 
+WRITE_HANDLER( watchdog_disarm_w )
+{
+	watchdog_counter = -1;
+}
 
 WRITE_HANDLER( watchdog_reset_w )
 {

src/cpuexec.h

@@ -101,6 +101,9 @@ void mame_frame(void);
  *
  *************************************/
 
+/* Used to disarm the watchdog while cpu is paused */
+WRITE_HANDLER( watchdog_disarm_w );
+
 /* 8-bit watchdog read/write handlers */
 WRITE_HANDLER( watchdog_reset_w );
 READ_HANDLER( watchdog_reset_r );

src/drawgfx.c

@@ -3521,7 +3521,7 @@ void draw_crosshair(struct mame_bitmap *bitmap,int x,int y,const struct rectangl
 	unsigned long black,white;
 	int i;
 
-	if (!options.crosshair_enable)
+	if (!options.crosshair_enable || cpu_pause_state)
 		return;
 
 	black = Machine->uifont->colortable[0];

src/mame2003/mame2003.c

@@ -389,6 +389,30 @@ int16_t get_pointer_delta(int16_t coord, int16_t *prev_coord)
    return delta;
 }
 
+bool cpu_pause_state = false;
+
+void cpu_pause(bool pause)
+{
+  int cpunum;
+
+  for (cpunum = 0; cpunum < cpu_gettotalcpu(); cpunum++)
+  {
+    if (pause)
+      cpunum_suspend(cpunum, SUSPEND_REASON_DISABLE, 1);
+    else
+      cpunum_resume(cpunum, SUSPEND_ANY_REASON);
+  }
+
+  /* disarm watchdog to prevent reset */
+  if (pause) watchdog_disarm_w(0, 0);
+
+  /* update state */
+  if (pause)
+    cpu_pause_state = true;
+  else
+    cpu_pause_state = false;
+}
+
 void retro_run (void)
 {
 	int i;
@@ -668,35 +692,39 @@ int osd_start_audio_stream(int stereo)
 int osd_update_audio_stream(INT16 *buffer)
 {
 	int i,j;
-	if ( Machine->sample_rate !=0 && buffer )
+	if ( Machine->sample_rate !=0 && buffer)
 	{
-   		memcpy(samples_buffer, buffer, samples_per_frame * (usestereo ? 4 : 2));
+		if (cpu_pause_state)
+			memset(samples_buffer, 0,      samples_per_frame * (usestereo ? 4 : 2));
+		else
+			memcpy(samples_buffer, buffer, samples_per_frame * (usestereo ? 4 : 2));
 		if (usestereo)
 			audio_batch_cb(samples_buffer, samples_per_frame);
 		else
 		{
 			for (i = 0, j = 0; i < samples_per_frame; i++)
-        		{
+			{
 				conversion_buffer[j++] = samples_buffer[i];
 				conversion_buffer[j++] = samples_buffer[i];
-		        }
-         		audio_batch_cb(conversion_buffer,samples_per_frame);
+			}
+			audio_batch_cb(conversion_buffer,samples_per_frame);
 		}
+		if (cpu_pause_state)
+			return samples_per_frame;
 
-
-		//process next frame
+		/*process next frame */
 
 		if ( samples_per_frame  != orig_samples_per_frame ) samples_per_frame = orig_samples_per_frame;
 
-		// dont drop any sample frames some games like mk will drift with time
+		/* dont drop any sample frames some games like mk will drift with time */
 
 		delta_samples += (Machine->sample_rate / Machine->drv->frames_per_second) - orig_samples_per_frame;
 		if ( delta_samples >= 1.0f )
 		{
 
 			int integer_delta = (int)delta_samples;
 			if (integer_delta <= 16 )
-                        {
+			{
 				log_cb(RETRO_LOG_DEBUG,"sound: Delta added value %d added to frame\n",integer_delta);
 				samples_per_frame += integer_delta;
 			}
@@ -706,7 +734,7 @@ int osd_update_audio_stream(INT16 *buffer)
 
 		}
 	}
-        return samples_per_frame;
+	return samples_per_frame;
 }
 
 

src/mame2003/mame2003.h

@@ -227,6 +227,13 @@ int osd_skip_this_frame(void);
 void osd_update_video_and_audio(struct mame_display *display);
 
 
+/*
+  Pause or resume all active cpus, true->pause, false->resume.
+*/
+extern bool cpu_pause_state;
+extern void cpu_pause(bool pause);
+
+
 /******************************************************************************
 
 	Sound

src/usrintrf.c

@@ -1055,7 +1055,7 @@ static void showcharset(struct mame_bitmap *bitmap)
 	pen_t *colortable = NULL;
 	static const struct rectangle fullrect = { 0, 10000, 0, 10000 };
 
-  
+
 		/* mark the whole thing dirty */
 		ui_markdirty(&fullrect);
 
@@ -3274,6 +3274,8 @@ int handle_user_interface(struct mame_bitmap *bitmap)
       setup_via_menu = 1;
 	    setup_menu_init();      
     }
+
+      if (setup_active()) cpu_pause(true);
   }
 
 	if (setup_selected && setup_via_menu && !options.display_setup)
@@ -3326,11 +3328,16 @@ int handle_user_interface(struct mame_bitmap *bitmap)
 			skip_tmap = 0;
 			tilemap_xpos = 0;
 			tilemap_ypos = 0;
+
+			cpu_pause(true);
 		}
 	}
 
 	if(toggle_gfx) showcharset(bitmap);
 
+	if (!setup_active() && !toggle_gfx && cpu_pause_state)
+		cpu_pause(false);
+
 	return 0;
 }