Various game engine fixes:

* Fix issue with add transparency mode with blender materials.
* Possible fix at frontface flip in the game engine.
* Fix color buffering clearing for multiple viewports, it used
  to clear as if there was one.
* Fix for zoom level in user defined viewports, it was based on
  the full window before, now it is based on the viewport itself.
* For user defined viewports, always use Expose instead of
  Letterbox with bars, the latter doesn't make sense then.

source/blender/blenloader/intern/readfile.c

@@ -7762,7 +7762,7 @@ static void do_versions(FileData *fd, Library *lib, Main *main)
 		}
 	}
 
-	if(main->versionfile <= 246 && main->subversionfile < 1){
+	if(main->versionfile < 246 || (main->versionfile == 246 && main->subversionfile < 1)) {
 		Mesh *me;
 
 		for(me=main->mesh.first; me; me= me->id.next)

source/gameengine/Converter/BL_BlenderDataConversion.cpp

@@ -627,7 +627,7 @@ BL_Material* ConvertMaterial(
 		material->transp = TF_ALPHA;
 
   	// always zsort alpha + add
-	if((material->transp == TF_ALPHA || texalpha) && (material->transp != TF_CLIP)) {
+	if((material->transp == TF_ALPHA || material->transp == TF_ADD || texalpha) && (material->transp != TF_CLIP)) {
 		material->ras_mode |= ALPHA;
 		material->ras_mode |= (material->mode & TF_ALPHASORT)? ZSORT: 0;
 	}

source/gameengine/GamePlayer/ghost/GPG_ghost.cpp

@@ -629,7 +629,8 @@ int main(int argc, char** argv)
 				char pathname[160];
 
 				get_filename(argc, argv, filename);
-				make_absolute_filename(filename);
+				if(filename[0])
+					make_absolute_filename(filename);
 				
 				do
 				{

source/gameengine/Ketsji/KX_KetsjiEngine.cpp

@@ -276,30 +276,73 @@ void KX_KetsjiEngine::StartEngine(bool clearIpo)
 
 }
 
+void KX_KetsjiEngine::ClearFrame()
+{
+	// clear unless we're drawing overlapping stereo
+	if(m_rasterizer->InterlacedStereo() &&
+		m_rasterizer->GetEye() == RAS_IRasterizer::RAS_STEREO_RIGHTEYE)
+		return;
+
+	// clear the viewports with the background color of the first scene
+	bool doclear = false;
+	KX_SceneList::iterator sceneit;
+	RAS_Rect clearvp, area, viewport;
+
+	for (sceneit = m_scenes.begin(); sceneit != m_scenes.end(); sceneit++)
+	{
+		KX_Scene* scene = *sceneit;
+		//const RAS_FrameSettings &framesettings = scene->GetFramingType();
+		list<class KX_Camera*>* cameras = scene->GetCameras();
+
+		list<KX_Camera*>::iterator it;
+		for(it = cameras->begin(); it != cameras->end(); it++)
+		{
+			SetupViewport(scene, (*it), area, viewport);
+
+			if(!doclear) {
+				clearvp = viewport;
+				doclear = true;
+			}
+			else {
+				if(viewport.GetLeft() < clearvp.GetLeft())
+					clearvp.SetLeft(viewport.GetLeft());
+				if(viewport.GetBottom() < clearvp.GetBottom())
+					clearvp.SetBottom(viewport.GetBottom());
+				if(viewport.GetRight() > clearvp.GetRight())
+					clearvp.SetRight(viewport.GetRight());
+				if(viewport.GetTop() > clearvp.GetTop())
+					clearvp.SetTop(viewport.GetTop());
+
+			}
+		}
+	}
+
+	if(doclear) {
+		KX_Scene* firstscene = *m_scenes.begin();
+		SetBackGround(firstscene->GetWorldInfo());
+
+		m_canvas->SetViewPort(clearvp.GetLeft(), clearvp.GetBottom(),
+			clearvp.GetRight(), clearvp.GetTop());	
+		m_rasterizer->ClearColorBuffer();
+	}
+}
+
 bool KX_KetsjiEngine::BeginFrame()
 {
-	bool result = false;
-
-	RAS_Rect vp;
-	KX_Scene* firstscene = *m_scenes.begin();
-	const RAS_FrameSettings &framesettings = firstscene->GetFramingType();
-
-	// set the area used for rendering
+	// set the area used for rendering (stereo can assign only a subset)
 	m_rasterizer->SetRenderArea();
 
-	RAS_FramingManager::ComputeViewport(framesettings, m_canvas->GetDisplayArea(), vp);
-
 	if (m_canvas->BeginDraw())
 	{
-		result = true;
+		ClearFrame();
 
-		m_canvas->SetViewPort(vp.GetLeft(), vp.GetBottom(), vp.GetRight(), vp.GetTop());
-		SetBackGround( firstscene->GetWorldInfo() );
-		m_rasterizer->BeginFrame( m_drawingmode , m_kxsystem->GetTimeInSeconds());
-		m_rendertools->BeginFrame( m_rasterizer);
+		m_rasterizer->BeginFrame(m_drawingmode , m_kxsystem->GetTimeInSeconds());
+		m_rendertools->BeginFrame(m_rasterizer);
+
+		return true;
 	}
 	
-	return result;
+	return false;
 }		
 
 
@@ -606,7 +649,7 @@ void KX_KetsjiEngine::Render()
 				);
 		}
 		// clear the -whole- viewport
-		m_canvas->ClearBuffer(RAS_ICanvas::COLOR_BUFFER);
+		m_canvas->ClearBuffer(RAS_ICanvas::COLOR_BUFFER|RAS_ICanvas::DEPTH_BUFFER);
 	}
 
 	m_rasterizer->SetEye(RAS_IRasterizer::RAS_STEREO_LEFTEYE);
@@ -635,9 +678,6 @@ void KX_KetsjiEngine::Render()
 	
 			m_rendertools->SetAuxilaryClientInfo(scene);
 	
-			//Initialize scene viewport.
-			SetupRenderFrame(scene, cam);
-	
 			// do the rendering
 			RenderFrame(scene, cam);
 		}
@@ -655,9 +695,6 @@ void KX_KetsjiEngine::Render()
 		
 				m_rendertools->SetAuxilaryClientInfo(scene);
 		
-				//Initialize scene viewport.
-				SetupRenderFrame(scene, (*it));
-		
 				// do the rendering
 				RenderFrame(scene, (*it));
 			}
@@ -690,10 +727,6 @@ void KX_KetsjiEngine::Render()
 			//pass the scene, for picking and raycasting (shadows)
 			m_rendertools->SetAuxilaryClientInfo(scene);
 
-			//Initialize scene viewport.
-			//SetupRenderFrame(scene);
-			SetupRenderFrame(scene, cam);
-
 			// do the rendering
 			//RenderFrame(scene);
 			RenderFrame(scene, cam);
@@ -854,7 +887,7 @@ void KX_KetsjiEngine::SetCameraOverrideViewMatrix(const MT_CmMatrix4x4& mat)
 }
 
 	
-void KX_KetsjiEngine::SetupRenderFrame(KX_Scene *scene, KX_Camera* cam)
+void KX_KetsjiEngine::SetupViewport(KX_Scene *scene, KX_Camera* cam, RAS_Rect& area, RAS_Rect& viewport)
 {
 	// In this function we make sure the rasterizer settings are upto
 	// date. We compute the viewport so that logic
@@ -862,17 +895,26 @@ void KX_KetsjiEngine::SetupRenderFrame(KX_Scene *scene, KX_Camera* cam)
 
 	// Note we postpone computation of the projection matrix
 	// so that we are using the latest camera position.
-
-	RAS_Rect viewport;
-
-	if (!cam)
-		return;
-
 	if (cam->GetViewport()) {
-		viewport.SetLeft(cam->GetViewportLeft()); 
-		viewport.SetBottom(cam->GetViewportBottom());
-		viewport.SetRight(cam->GetViewportRight());
-		viewport.SetTop(cam->GetViewportTop());
+		RAS_Rect userviewport;
+
+		userviewport.SetLeft(cam->GetViewportLeft()); 
+		userviewport.SetBottom(cam->GetViewportBottom());
+		userviewport.SetRight(cam->GetViewportRight());
+		userviewport.SetTop(cam->GetViewportTop());
+
+		// Don't do bars on user specified viewport
+		RAS_FrameSettings settings = scene->GetFramingType();
+		if(settings.FrameType() == RAS_FrameSettings::e_frame_bars)
+			settings.SetFrameType(RAS_FrameSettings::e_frame_extend);
+
+		RAS_FramingManager::ComputeViewport(
+			scene->GetFramingType(),
+			userviewport,
+			viewport
+		);
+
+		area = userviewport;
 	}
 	else if ( m_overrideCam || (scene->GetName() != m_overrideSceneName) ||  m_overrideCamUseOrtho ) {
 		RAS_FramingManager::ComputeViewport(
@@ -880,24 +922,16 @@ void KX_KetsjiEngine::SetupRenderFrame(KX_Scene *scene, KX_Camera* cam)
 			m_canvas->GetDisplayArea(),
 			viewport
 		);
+
+		area = m_canvas->GetDisplayArea();
 	} else {
 		viewport.SetLeft(0); 
 		viewport.SetBottom(0);
 		viewport.SetRight(int(m_canvas->GetWidth()));
 		viewport.SetTop(int(m_canvas->GetHeight()));
+
+		area = m_canvas->GetDisplayArea();
 	}
-	// store the computed viewport in the scene
-
-	scene->SetSceneViewport(viewport);	
-
-	// set the viewport for this frame and scene
-	m_canvas->SetViewPort(
-		viewport.GetLeft(),
-		viewport.GetBottom(),
-		viewport.GetRight(),
-		viewport.GetTop()
-	);	
-
 }
 
 void KX_KetsjiEngine::RenderShadowBuffers(KX_Scene *scene)
@@ -951,6 +985,7 @@ void KX_KetsjiEngine::RenderShadowBuffers(KX_Scene *scene)
 // update graphics
 void KX_KetsjiEngine::RenderFrame(KX_Scene* scene, KX_Camera* cam)
 {
+	RAS_Rect viewport, area;
 	float left, right, bottom, top, nearfrust, farfrust, focallength;
 	const float ortho = 100.0;
 //	KX_Camera* cam = scene->GetActiveCamera();
@@ -958,6 +993,15 @@ void KX_KetsjiEngine::RenderFrame(KX_Scene* scene, KX_Camera* cam)
 	if (!cam)
 		return;
 
+	SetupViewport(scene, cam, area, viewport);
+
+	// store the computed viewport in the scene
+	scene->SetSceneViewport(viewport);	
+
+	// set the viewport for this frame and scene
+	m_canvas->SetViewPort(viewport.GetLeft(), viewport.GetBottom(),
+		viewport.GetRight(), viewport.GetTop());	
+	
 	// see KX_BlenderMaterial::Activate
 	//m_rasterizer->SetAmbient();
 	m_rasterizer->DisplayFog();
@@ -985,8 +1029,8 @@ void KX_KetsjiEngine::RenderFrame(KX_Scene* scene, KX_Camera* cam)
 		
 		RAS_FramingManager::ComputeFrustum(
 			scene->GetFramingType(),
-			m_canvas->GetDisplayArea(),
-			scene->GetSceneViewport(),
+			area,
+			viewport,
 			lens,
 			nearfrust,
 			farfrust,

source/gameengine/Ketsji/KX_KetsjiEngine.h

@@ -177,7 +177,7 @@ private:
 	/** Blue component of framing bar color. */
 	float					m_overrideFrameColorB;
 
-	void					SetupRenderFrame(KX_Scene *scene, KX_Camera* cam);
+	void					SetupViewport(KX_Scene *scene, KX_Camera* cam, RAS_Rect& area, RAS_Rect& viewport);
 	void					RenderFrame(KX_Scene* scene, KX_Camera* cam);
 	void					PostRenderFrame();
 	void					RenderDebugProperties();
@@ -355,6 +355,7 @@ protected:
 	KX_Scene*		CreateScene(const STR_String& scenename);
 	
 	bool			BeginFrame();
+	void			ClearFrame();
 	void			EndFrame();
 };
 

source/gameengine/Rasterizer/RAS_BucketManager.cpp

@@ -130,9 +130,6 @@ void RAS_BucketManager::OrderBuckets(const MT_Transform& cameratrans, BucketList
 		sort(slots.begin(), slots.end(), fronttoback());
 }
 
-//static int TOTASLOT = 0;
-//static int TOTSLOT = 0;
-
 void RAS_BucketManager::RenderAlphaBuckets(
 	const MT_Transform& cameratrans, RAS_IRasterizer* rasty, RAS_IRenderTools* rendertools)
 {
@@ -149,10 +146,8 @@ void RAS_BucketManager::RenderAlphaBuckets(
 	for(sit=slots.begin(); sit!=slots.end(); ++sit) {
 		rendertools->SetClientObject(rasty, sit->m_ms->m_clientObj);
 
-		while(sit->m_bucket->ActivateMaterial(cameratrans, rasty, rendertools)) {
+		while(sit->m_bucket->ActivateMaterial(cameratrans, rasty, rendertools))
 			sit->m_bucket->RenderMeshSlot(cameratrans, rasty, rendertools, *(sit->m_ms));
-			//TOTASLOT++;
-		}
 	}
 
 	rasty->SetDepthMask(RAS_IRasterizer::KX_DEPTHMASK_ENABLED);
@@ -173,13 +168,14 @@ void RAS_BucketManager::RenderSolidBuckets(
 
 			rendertools->SetClientObject(rasty, mit->m_clientObj);
 
-			while ((*bit)->ActivateMaterial(cameratrans, rasty, rendertools)) {
+			while ((*bit)->ActivateMaterial(cameratrans, rasty, rendertools))
 				(*bit)->RenderMeshSlot(cameratrans, rasty, rendertools, *mit);
-				//TOTSLOT++;
-			}
 		}
 	}
 	
+	/* this code draws meshes order front-to-back instead to reduce overdraw.
+	 * it turned out slower due to much material state switching, a more clever
+	 * algorithm might do better. */
 #if 0
 	vector<sortedmeshslot> slots;
 	vector<sortedmeshslot>::iterator sit;
@@ -198,17 +194,12 @@ void RAS_BucketManager::RenderSolidBuckets(
 void RAS_BucketManager::Renderbuckets(
 	const MT_Transform& cameratrans, RAS_IRasterizer* rasty, RAS_IRenderTools* rendertools)
 {
-	// beginning each frame, clear (texture/material) caching information
+	/* beginning each frame, clear (texture/material) caching information */
 	rasty->ClearCachingInfo();
 
-	//TOTASLOT = 0;
-	//TOTSLOT = 0;
-
 	RenderSolidBuckets(cameratrans, rasty, rendertools);	
 	RenderAlphaBuckets(cameratrans, rasty, rendertools);	
 
-	//printf("total slots = %d = %d + %d\n", TOTSLOT + TOTASLOT, TOTSLOT, TOTASLOT);
-
 	rendertools->SetClientObject(rasty, NULL);
 }
 

source/gameengine/Rasterizer/RAS_FramingManager.h

@@ -109,6 +109,13 @@ public :
 		return m_frame_type;
 	};
 
+		void
+	SetFrameType(
+		RAS_FrameType type
+	) {
+		m_frame_type = type;
+	};
+	
 		float
 	BarRed(
 	) const {
@@ -141,14 +148,6 @@ public :
 
 private :
 
-	/**
-	 * private to force use of public constructor
-	 */
-
-	RAS_FrameSettings(
-		const RAS_FrameSettings &
-	);
-
 	RAS_FrameType m_frame_type;
 	float m_bar_r;
 	float m_bar_g;

source/gameengine/Rasterizer/RAS_IRasterizer.h

@@ -168,6 +168,10 @@ public:
 	 * BeginFrame is called at the start of each frame.
 	 */
 	virtual bool	BeginFrame(int drawingmode, double time)=0;
+	/**
+	 * ClearColorBuffer clears the color buffer.
+	 */
+	virtual void	ClearColorBuffer()=0;
 	/**
 	 * ClearDepthBuffer clears the depth buffer.
 	 */
@@ -181,7 +185,8 @@ public:
 	 */
 	virtual void	EndFrame()=0;
 	/**
-	 * SetRenderArea sets the render area from the 2d canvas
+	 * SetRenderArea sets the render area from the 2d canvas.
+	 * Returns true if only of subset of the canvas is used.
 	 */
 	virtual void	SetRenderArea()=0;
 
@@ -195,6 +200,7 @@ public:
 	 * @return true if stereo mode is enabled.
 	 */
 	virtual bool	Stereo()=0;
+	virtual bool	InterlacedStereo()=0;
 	/**
 	 * Sets which eye buffer subsequent primitives will be rendered to.
 	 */

source/gameengine/Rasterizer/RAS_OpenGLRasterizer/RAS_OpenGLRasterizer.cpp

@@ -105,8 +105,12 @@ bool RAS_OpenGLRasterizer::Init()
 	m_ambg = 0.0f;
 	m_ambb = 0.0f;
 
-	SetBlendingMode(GPU_BLEND_SOLID);
-	SetFrontFace(true);
+	glDisable(GL_BLEND);
+	glDisable(GL_ALPHA_TEST);
+	m_last_blendmode = GPU_BLEND_SOLID;
+
+	glFrontFace(GL_CCW);
+	m_last_frontface = true;
 
 	glClearColor(m_redback,m_greenback,m_blueback,m_alphaback);
 	glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
@@ -250,22 +254,11 @@ void RAS_OpenGLRasterizer::Exit()
 	EndFrame();
 }
 
-bool RAS_OpenGLRasterizer::InterlacedStereo() const
-{
-	return m_stereomode == RAS_STEREO_VINTERLACE || m_stereomode == RAS_STEREO_INTERLACED;
-}
-
 bool RAS_OpenGLRasterizer::BeginFrame(int drawingmode, double time)
 {
 	m_time = time;
 	m_drawingmode = drawingmode;
 
-	if (!InterlacedStereo() || m_curreye == RAS_STEREO_LEFTEYE)
-	{
-		m_2DCanvas->ClearColor(m_redback,m_greenback,m_blueback,m_alphaback);
-		m_2DCanvas->ClearBuffer(RAS_ICanvas::COLOR_BUFFER);
-	}
-
 	// Blender camera routine destroys the settings
 	if (m_drawingmode < KX_SOLID)
 	{
@@ -278,8 +271,12 @@ bool RAS_OpenGLRasterizer::BeginFrame(int drawingmode, double time)
 		glEnable (GL_CULL_FACE);
 	}
 
-	SetBlendingMode(GPU_BLEND_SOLID);
-	SetFrontFace(true);
+	glDisable(GL_BLEND);
+	glDisable(GL_ALPHA_TEST);
+	m_last_blendmode = GPU_BLEND_SOLID;
+
+	glFrontFace(GL_CCW);
+	m_last_frontface = true;
 
 	glShadeModel(GL_SMOOTH);
 
@@ -310,6 +307,12 @@ void RAS_OpenGLRasterizer::SetDepthMask(DepthMask depthmask)
 }
 
 
+void RAS_OpenGLRasterizer::ClearColorBuffer()
+{
+	m_2DCanvas->ClearColor(m_redback,m_greenback,m_blueback,m_alphaback);
+	m_2DCanvas->ClearBuffer(RAS_ICanvas::COLOR_BUFFER);
+}
+
 
 void RAS_OpenGLRasterizer::ClearDepthBuffer()
 {
@@ -420,6 +423,10 @@ bool RAS_OpenGLRasterizer::Stereo()
 		return true;
 }
 
+bool RAS_OpenGLRasterizer::InterlacedStereo()
+{
+	return m_stereomode == RAS_STEREO_VINTERLACE || m_stereomode == RAS_STEREO_INTERLACED;
+}
 
 void RAS_OpenGLRasterizer::SetEye(const StereoEye eye)
 {

source/gameengine/Rasterizer/RAS_OpenGLRasterizer/RAS_OpenGLRasterizer.h

@@ -88,7 +88,6 @@ class RAS_OpenGLRasterizer : public RAS_IRasterizer
 	float			m_focallength;
 	bool			m_setfocallength;
 	int				m_noOfScanlines;
-	bool			InterlacedStereo() const;
 
 	//motion blur
 	int	m_motionblur;
@@ -131,6 +130,7 @@ public:
 	virtual bool	Init();
 	virtual void	Exit();
 	virtual bool	BeginFrame(int drawingmode, double time);
+	virtual void	ClearColorBuffer();
 	virtual void	ClearDepthBuffer();
 	virtual void	ClearCachingInfo(void);
 	virtual void	EndFrame();
@@ -138,6 +138,7 @@ public:
 
 	virtual void	SetStereoMode(const StereoMode stereomode);
 	virtual bool	Stereo();
+	virtual bool	InterlacedStereo();
 	virtual void	SetEye(const StereoEye eye);
 	virtual StereoEye	GetEye();
 	virtual void	SetEyeSeparation(const float eyeseparation);