puae: support region changes

by user at the start and by the game on the fly
todo: ntsc par (pal par is 1:1)

src/BizHawk.Emulation.Cores/Computers/Amiga/PUAE.ISettable.cs

@@ -60,6 +60,12 @@ public enum Chipset
 			Auto
 		}
 
+		public enum VideoStandard
+		{
+			PAL,
+			NTSC
+		}
+
 		public enum ChipMemory
 		{
 			[Display(Name = "512KB")]
@@ -224,6 +230,12 @@ private void CreateArguments(PUAESyncSettings settings)
 				AppendSetting("fastmem_size=" + settings.FastMemory);
 			}
 
+			if (settings.Region == VideoStandard.NTSC)
+			{
+				AppendSetting("ntsc=true");
+				VsyncNumerator = 60;
+			}
+
 			AppendSetting("input.mouse_speed=" + settings.MouseSpeed);
 			AppendSetting("sound_stereo_separation=" + settings.StereoSeparation / 10);
 		}
@@ -335,6 +347,11 @@ public class PUAESyncSettings
 			[TypeConverter(typeof(ConstrainedIntConverter))]
 			public int FloppyDrives { get; set; }
 
+			[DisplayName("Video standard")]
+			[Description("Determines resolution and framerate.")]
+			[DefaultValue(VideoStandard.PAL)]
+			public VideoStandard Region { get; set; }
+
 			public PUAESyncSettings()
 				=> SettingsUtil.SetDefaultValues(this);
 

src/BizHawk.Emulation.Cores/Computers/Amiga/PUAE.cs

@@ -313,6 +313,11 @@ protected override LibWaterboxCore.FrameInfo FrameAdvancePrep(IController contro
 			return fi;
 		}
 
+		protected override void FrameAdvancePost()
+		{
+			VsyncNumerator = BufferHeight == LibPUAE.NTSC_HEIGHT ? 60 : 50;
+		}
+
 		protected override void SaveStateBinaryInternal(BinaryWriter writer)
 		{
 			writer.Write(_ejectPressed);

waterbox/uae/bizhawk.c

@@ -25,8 +25,9 @@ ECL_EXPORT bool Init(int argc, char **argv)
 
 ECL_EXPORT void FrameAdvance(MyFrameInfo* f)
 {
-    f->base.Width = 720;
-    f->base.Height = 576;
+	bool is_ntsc = minfirstline == VBLANK_ENDLINE_NTSC;
+    f->base.Width = PUAE_VIDEO_WIDTH;
+    f->base.Height = is_ntsc ? PUAE_VIDEO_HEIGHT_NTSC : PUAE_VIDEO_HEIGHT_PAL;
 	sound_buffer = f->base.SoundBuffer;
 	thisframe_y_adjust = minfirstline;
 	visible_left_border = retro_max_diwlastword - retrow;