SDL/OPENGL: Add ability to switch between SDL and OpenGL graphics managers.

OSystem_SDL will create a merged list of all graphics modes from SDL and OpenGL. When the user changes the graphics mode in options and restarts ScummVM should switch to that graphics mode in the corresponding graphics manager.

svn-id: r51493

2 files changed, 126 insertions, 13 deletions

diff --git a/backends/platform/sdl/sdl.cpp b/backends/platform/sdl/sdl.cpp
index 3db6d047f8..cf6d44ebb7 100644
--- a/backends/platform/sdl/sdl.cpp
+++ b/backends/platform/sdl/sdl.cpp
@@ -43,6 +43,12 @@
 
 OSystem_SDL::OSystem_SDL()
 	:
+#ifdef USE_OPENGL
+	_graphicsModes(0),
+	_graphicsMode(0),
+	_sdlModesCount(0),
+	_glModesCount(0),
+#endif
 	_inited(false),
 	_initedSDL(false),
 	_mixerManager(0) {
@@ -87,26 +93,24 @@ void OSystem_SDL::initBackend() {
 
 	if (_graphicsManager == 0) {
 #ifdef USE_OPENGL
-		/*if (ConfMan.hasKey("gfx_mode")) {
-			Common::String gfxMode(ConfMan.get("gfx_mode"));
-
-			_openglGraphicsMode = OpenGLSdlGraphicsManager::getSupportedGraphicsModes();
+		// Setup a list with both SDL and OpenGL graphics modes
+		setupGraphicsModes();
 
+		if (ConfMan.hasKey("gfx_mode")) {
+			Common::String gfxMode(ConfMan.get("gfx_mode"));
 			bool use_opengl = false;
-
-			while (_openglGraphicsMode->name) {
-				if (scumm_stricmp(_openglGraphicsMode->name, gfxMode.c_str()) == 0)
+			const OSystem::GraphicsMode *mode = OpenGLSdlGraphicsManager::supportedGraphicsModes();
+			while (mode->name) {
+				if (scumm_stricmp(mode->name, gfxMode.c_str()) == 0)
 					use_opengl = true;
 
-				_openglGraphicsMode++;
+				mode++;
 			}
 
-			if (use_opengl) {
+			// If the gfx_mode is from OpenGL, create the OpenGL graphics manager
+			if (use_opengl)
 				_graphicsManager = new OpenGLSdlGraphicsManager();
-				((OpenGLSdlGraphicsManager *)_graphicsManager)->init();
-			}
-		}*/
-		_graphicsManager = new OpenGLSdlGraphicsManager();
+		}
 #endif
 		if (_graphicsManager == 0)
 			_graphicsManager = new SdlGraphicsManager();
@@ -202,6 +206,10 @@ void OSystem_SDL::deinit() {
 	delete _mutexManager;
 	_mutexManager = 0;
 
+#ifdef USE_OPENGL
+	free((void *)_graphicsModes),
+#endif
+
 	SDL_Quit();
 }
 
@@ -297,3 +305,91 @@ SdlMixerManager *OSystem_SDL::getMixerManager() {
 	assert(_mixerManager);
 	return _mixerManager;
 }
+
+#ifdef USE_OPENGL
+
+const OSystem::GraphicsMode *OSystem_SDL::getSupportedGraphicsModes() const {
+	return _graphicsModes;
+}
+
+int OSystem_SDL::getDefaultGraphicsMode() const {
+	if (_graphicsMode < _sdlModesCount)
+		return _graphicsManager->getDefaultGraphicsMode();
+	else
+		return _graphicsManager->getDefaultGraphicsMode() + _sdlModesCount;
+}
+
+bool OSystem_SDL::setGraphicsMode(int mode) {
+	const OSystem::GraphicsMode *srcMode;
+	int i;
+	if (mode < _sdlModesCount) {
+		srcMode = SdlGraphicsManager::supportedGraphicsModes();
+		i = 0;
+	} else {
+		srcMode = OpenGLSdlGraphicsManager::supportedGraphicsModes();
+		i = _sdlModesCount;
+	}
+	while (srcMode->name) {
+		if (i == mode) {
+			if (_graphicsMode >= _sdlModesCount && mode < _sdlModesCount) {
+				delete _graphicsManager;
+				_graphicsManager = new SdlGraphicsManager();
+				_graphicsManager->beginGFXTransaction();
+			} else if (_graphicsMode < _sdlModesCount && mode >= _sdlModesCount) {
+				delete _graphicsManager;
+				_graphicsManager = new OpenGLSdlGraphicsManager();
+				_graphicsManager->beginGFXTransaction();
+			}
+			_graphicsMode = mode;
+			return _graphicsManager->setGraphicsMode(srcMode->id);
+		}
+		i++;
+		srcMode++;
+	}
+	return false;
+}
+
+int OSystem_SDL::getGraphicsMode() const {
+	return _graphicsMode;
+}
+
+void OSystem_SDL::setupGraphicsModes() {
+	const OSystem::GraphicsMode *sdlGraphicsModes = SdlGraphicsManager::supportedGraphicsModes();
+	const OSystem::GraphicsMode *openglGraphicsModes = OpenGLSdlGraphicsManager::supportedGraphicsModes();
+	_sdlModesCount = 0;
+	_glModesCount = 0;
+
+	// Count the number of graphics modes
+	const OSystem::GraphicsMode *srcMode = sdlGraphicsModes;
+	while (srcMode->name) {
+		_sdlModesCount++;
+		srcMode++;
+	}
+	srcMode = openglGraphicsModes;
+	while (srcMode->name) {
+		_glModesCount ++;
+		srcMode++;
+	}
+
+	// Allocate enough space for merged array of modes
+	_graphicsModes = (OSystem::GraphicsMode *)malloc(sizeof(OSystem::GraphicsMode) * (_glModesCount  + _sdlModesCount + 1));
+
+	// Copy SDL graphics modes
+	memcpy((void *)_graphicsModes, sdlGraphicsModes, _sdlModesCount * sizeof(OSystem::GraphicsMode));
+
+	// Copy OpenGL graphics modes
+	memcpy((void *)(_graphicsModes + _sdlModesCount), openglGraphicsModes, _glModesCount  * sizeof(OSystem::GraphicsMode));
+
+	// Set a null mode at the end
+	memset((void *)(_graphicsModes + _sdlModesCount + _glModesCount), 0, sizeof(OSystem::GraphicsMode));
+
+	// Set new internal ids for all modes
+	int i = 0;
+	OSystem::GraphicsMode * mode = _graphicsModes;
+	while (mode->name) {
+		mode->id = i++;
+		mode++;
+	}
+}
+
+#endif
diff --git a/backends/platform/sdl/sdl.h b/backends/platform/sdl/sdl.h
index cf02438e91..17d4dc4ed9 100644
--- a/backends/platform/sdl/sdl.h
+++ b/backends/platform/sdl/sdl.h
@@ -103,6 +103,23 @@ protected:
 	 * of ScummVM will be saved.
 	 */
 	virtual Common::String getDefaultConfigFileName();
+
+#ifdef USE_OPENGL
+	OSystem::GraphicsMode *_graphicsModes;
+	int _graphicsMode;
+	int _sdlModesCount;
+	int _glModesCount;
+
+	/**
+	 * Creates the merged graphics modes list
+	 */
+	virtual void setupGraphicsModes();
+
+	virtual const OSystem::GraphicsMode *getSupportedGraphicsModes() const;
+	virtual int getDefaultGraphicsMode() const;
+	virtual bool setGraphicsMode(int mode);
+	virtual int getGraphicsMode() const;
+#endif
 };
 
 #endif