Added OSD/Video.h to provide OSD-dependent video functionality. The static functions in here get called by Model3.cpp from within the render thread so that any OSD related rendering can also be run in parallel for a further speed increase.

Updated OSD/SDL/Main.cpp to provide the SDL implementations of the functions in OSD/Video.h.

Src/Model3/Model3.cpp

@@ -1932,9 +1932,8 @@ void CModel3::RunFrame(void)
 			SyncGPUs();
 		}
 
-		// Render frame if ready to do so
-		if (gpusReady)
-			RenderFrame();
+		// Render frame
+		RenderFrame();
 
 		// Enter notify wait critical section
 		if (!notifyLock->Lock())
@@ -2060,12 +2059,18 @@ void CModel3::RenderFrame(void)
 {
 	UINT32 start = CThread::GetTicks();
 
-	// Render frame
-	TileGen.BeginFrame();
-    GPU.BeginFrame();
-    GPU.RenderFrame();
-	GPU.EndFrame();
-	TileGen.EndFrame();
+	// Call OSD video callbacks
+	if (BeginFrameVideo() && gpusReady)
+	{
+		// Render frame
+		TileGen.BeginFrame();
+		GPU.BeginFrame();
+		GPU.RenderFrame();
+		GPU.EndFrame();
+		TileGen.EndFrame();
+	}
+
+	EndFrameVideo();
 
 	renderTicks = CThread::GetTicks() - start;
 }

Src/OSD/SDL/Main.cpp

@@ -320,7 +320,6 @@ static void PrintGLInfo(bool createScreen, bool infoLog, bool printExtensions)
 	else			printf("\n");
 }
 
-	
 /******************************************************************************
  Configuration
  
@@ -718,6 +717,29 @@ static void UpdateCrosshairs(CInputs *Inputs, unsigned showCrosshairs)
 	glEnd();		
 }
 
+	
+/******************************************************************************
+ Video Callbacks
+******************************************************************************/
+
+static CInputs *videoInputs = NULL;
+static unsigned videoShowCrosshairs = 0; // bit 1: player 1 crosshair, bit 0: player 2
+
+bool BeginFrameVideo()
+{
+	return true;
+}
+
+void EndFrameVideo()
+{
+	// Show crosshairs for light gun games
+	if (videoInputs)
+		UpdateCrosshairs(videoInputs, videoShowCrosshairs);
+
+	// Swap the buffers
+	SDL_GL_SwapBuffers();
+}
+
 
 /******************************************************************************
  Main Program Loop
@@ -737,7 +759,6 @@ int Supermodel(const char *zipFile, CInputs *Inputs, CINIFile *CmdLine)
 	CRender3D		*Render3D = new CRender3D();
 	unsigned		prevFPSTicks, currentFPSTicks, currentTicks, targetTicks, startTicks;
 	unsigned		fpsFramesElapsed, framesElapsed;
-	unsigned		showCrosshairs = 0;	// bit 1: player 1 crosshair, bit 0: player 2
 	bool			gameHasLightguns = false;
 	bool			quit = false;
 	bool            paused = false;
@@ -774,8 +795,14 @@ int Supermodel(const char *zipFile, CInputs *Inputs, CINIFile *CmdLine)
 	// Hide mouse if fullscreen, enable crosshairs for gun games
 	Inputs->GetInputSystem()->SetMouseVisibility(!g_Config.fullScreen);
 	gameHasLightguns = !!(Model3->GetGameInfo()->inputFlags & (GAME_INPUT_GUN1|GAME_INPUT_GUN2));
-	if (g_Config.fullScreen && gameHasLightguns)
-		showCrosshairs = 1;	// show player 1 cursor only by default (TODO: add an IsMapped() member to CInput to allow testing for both lightguns)
+	if (gameHasLightguns)
+	{
+		videoInputs = Inputs;
+		if (g_Config.fullScreen && gameHasLightguns)
+			videoShowCrosshairs = 1; // show player 1 cursor only by default (TODO: add an IsMapped() member to CInput to allow testing for both lightguns)
+	}
+	else
+		videoInputs = NULL;
 
 	// Attach the inputs to the emulator
 	Model3->AttachInputs(Inputs);
@@ -812,12 +839,6 @@ int Supermodel(const char *zipFile, CInputs *Inputs, CINIFile *CmdLine)
 		{
 			// If not, run one frame
 			Model3->RunFrame();
-			
-			// Show crosshairs for light gun games
-			UpdateCrosshairs(Inputs, showCrosshairs);
-			
-			// Swap the buffers
-			SDL_GL_SwapBuffers();
 		}
 		
 		// Poll the inputs
@@ -1016,8 +1037,8 @@ int Supermodel(const char *zipFile, CInputs *Inputs, CINIFile *CmdLine)
 		}
 		else if (Inputs->uiSelectCrosshairs->Pressed() && gameHasLightguns)
  		{
-			showCrosshairs++;
-			switch ((showCrosshairs&3))
+			videoShowCrosshairs++;
+			switch ((videoShowCrosshairs&3))
 			{
 			case 0:	puts("Crosshairs disabled."); 				break;
 			case 3:	puts("Crosshairs enabled.");				break;

Src/OSD/Video.h

@@ -0,0 +1,47 @@
+/**
+ ** Supermodel
+ ** A Sega Model 3 Arcade Emulator.
+ ** Copyright 2011 Bart Trzynadlowski, Nik Henson
+ **
+ ** This file is part of Supermodel.
+ **
+ ** Supermodel is free software: you can redistribute it and/or modify it under
+ ** the terms of the GNU General Public License as published by the Free 
+ ** Software Foundation, either version 3 of the License, or (at your option)
+ ** any later version.
+ **
+ ** Supermodel is distributed in the hope that it will be useful, but WITHOUT
+ ** ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ ** FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ ** more details.
+ **
+ ** You should have received a copy of the GNU General Public License along
+ ** with Supermodel.  If not, see <http://www.gnu.org/licenses/>.
+ **/
+ 
+/*
+ * Video.h
+ * 
+ * Header file for OS-dependent video functionality.
+ */
+
+#ifndef INCLUDED_VIDEO_H
+#define INCLUDED_VIDEO_H
+
+/*
+ * BeginFrameVideo()
+ *
+ * Called at beginning of rendering of video frame.  Can be used by OSD layer to prevent rendering to screen.
+ *
+ * Returns true if emulator should render frame to screen.
+ */
+extern bool BeginFrameVideo();
+
+/*
+ * EndFrameVideo()
+ *
+ * Called at end of rendering of video frame.  Can be used by OSD layer to overlay graphics on screen.
+ */
+extern void EndFrameVideo();
+
+#endif	// INCLUDED_VIDEO_H

Src/Supermodel.h

@@ -103,6 +103,7 @@
 // OSD Interfaces
 #include "OSD/Thread.h"
 #include "OSD/Audio.h"
+#include "OSD/Video.h"
 
 
 /******************************************************************************

VS2008/Supermodel.vcproj

@@ -1892,6 +1892,10 @@
 					RelativePath="..\Src\OSD\Thread.h"
 					>
 				</File>
+				<File
+					RelativePath="..\Src\OSD\Video.h"
+					>
+				</File>
 				<Filter
 					Name="SDL"
 					>