Lua: add gui functions

Note:
- bug: when "draw messages in image" is ON, Lua drawings are drawn to the SNES image. However, keep in mind that it has a sort of "1 frame delay" problem. You won't experience the problem when the option is OFF.
- font size is larger than older versions, at this moment.
- gui.gdscreenshot() and gui.getcolor() will return the SNES image without any Lua drawings.
- gui.gdscreenshot() stretches a screenshot just as Snes9x normally does. It stretches the image if it's hi-res one or interlaced one. (i.e. same as Settings.StretchScreenshots = 1)

gfx.cpp

@@ -186,7 +186,10 @@
 #include "screenshot.h"
 #include "font.h"
 #include "display.h"
+
+#ifdef HAVE_LUA
 #include "lua-engine.h"
+#endif
 
 extern struct SCheatData		Cheat;
 extern struct SLineData			LineData[240];
@@ -435,8 +438,10 @@ void S9xEndScreenRefresh (void)
 				S9xDisplayMessages(GFX.Screen, GFX.RealPPL, IPPU.RenderedScreenWidth, IPPU.RenderedScreenHeight, 1);
 
 #ifdef HAVE_LUA
-	CallRegisteredLuaFunctions(LUACALL_AFTEREMULATIONGUI);
+			if (Settings.AutoDisplayMessages)
+				DrawLuaGuiToScreen(GFX.Screen, IPPU.RenderedScreenWidth, IPPU.RenderedScreenHeight, 16, GFX.Pitch, false);
 #endif
+
 			S9xDeinitUpdate(IPPU.RenderedScreenWidth, IPPU.RenderedScreenHeight);
 		}
 	}

lua-engine.h

@@ -91,7 +91,8 @@ void RestartAllLuaScripts();
 void EnableStopAllLuaScripts(bool enable);
 void DontWorryLua();
 
-
+void DrawLuaGuiToScreen(void *s, int width, int height, int bpp, int pitch, bool clear = true);
+void ClearLuaGui(void);
 
 #endif
 

win32/CDirect3D.cpp

@@ -191,6 +191,10 @@
 #include "../filter/hq2x.h"
 #include "../filter/2xsai.h"
 
+#ifdef HAVE_LUA
+#include "../lua-engine.h"
+#endif
+
 #ifndef max
 #define max(a, b) (((a) > (b)) ? (a) : (b))
 #endif
@@ -714,6 +718,9 @@ void CDirect3D::Render(SSurface Src)
 		if(!Settings.AutoDisplayMessages) {
 			WinSetCustomDisplaySurface((void *)Dst.Surface, Dst.Pitch/2, dstRect.right-dstRect.left, dstRect.bottom-dstRect.top, GetFilterScale(CurrentScale));
 			S9xDisplayMessages ((uint16*)Dst.Surface, Dst.Pitch/2, dstRect.right-dstRect.left, dstRect.bottom-dstRect.top, GetFilterScale(CurrentScale));
+#ifdef HAVE_LUA
+			DrawLuaGuiToScreen(Dst.Surface, dstRect.right-dstRect.left, dstRect.bottom-dstRect.top, 16, Dst.Pitch);
+#endif
 		}
 
 		drawSurface->UnlockRect(0);

win32/CDirectDraw.cpp

@@ -191,6 +191,10 @@
 #include "../filter/hq2x.h"
 #include "../filter/2xsai.h"
 
+#ifdef HAVE_LUA
+#include "../lua-engine.h"
+#endif
+
 //////////////////////////////////////////////////////////////////////
 // Construction/Destruction
 //////////////////////////////////////////////////////////////////////
@@ -604,6 +608,9 @@ void CDirectDraw::Render(SSurface Src)
 	if(!Settings.AutoDisplayMessages) {
 		WinSetCustomDisplaySurface((void *)Dst.Surface, (Dst.Pitch*8/GUI.ScreenDepth), srcRect.right-srcRect.left, srcRect.bottom-srcRect.top, GetFilterScale(CurrentScale));
 		S9xDisplayMessages ((uint16*)Dst.Surface, Dst.Pitch/2, srcRect.right-srcRect.left, srcRect.bottom-srcRect.top, GetFilterScale(CurrentScale));
+#ifdef HAVE_LUA
+		DrawLuaGuiToScreen(Dst.Surface, srcRect.right-srcRect.left, srcRect.bottom-srcRect.top, GUI.ScreenDepth, Dst.Pitch);
+#endif
 	}
 
 	RECT lastRect = SizeHistory [GUI.FlipCounter % GUI.NumFlipFrames];

win32/COpenGL.cpp

@@ -188,6 +188,9 @@
 #include "../filter/hq2x.h"
 #include "../filter/2xsai.h"
 
+#ifdef HAVE_LUA
+#include "../lua-engine.h"
+#endif
 
 COpenGL::COpenGL(void)
 {
@@ -440,6 +443,7 @@ void COpenGL::Render(SSurface Src)
 	if(!Settings.AutoDisplayMessages) {
 		WinSetCustomDisplaySurface((void *)Dst.Surface, Dst.Pitch/2, dstRect.right-dstRect.left, dstRect.bottom-dstRect.top, GetFilterScale(CurrentScale));
 		S9xDisplayMessages ((uint16*)Dst.Surface, Dst.Pitch/2, dstRect.right-dstRect.left, dstRect.bottom-dstRect.top, GetFilterScale(CurrentScale));
+		DrawLuaGuiToScreen(Dst.Surface, dstRect.right-dstRect.left, dstRect.bottom-dstRect.top, 16, Dst.Pitch);
 	}
 
 	if(pboFunctionsLoaded)