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.

2 files changed, 24 insertions, 16 deletions

diff --git a/source/gameengine/Rasterizer/RAS_OpenGLRasterizer/RAS_OpenGLRasterizer.cpp b/source/gameengine/Rasterizer/RAS_OpenGLRasterizer/RAS_OpenGLRasterizer.cpp
index 62ee2edb731..4f31ae7fcbc 100644
--- a/source/gameengine/Rasterizer/RAS_OpenGLRasterizer/RAS_OpenGLRasterizer.cpp
+++ b/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);
@@ -250,21 +254,10 @@ 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)
 {
diff --git a/source/gameengine/Rasterizer/RAS_OpenGLRasterizer/RAS_OpenGLRasterizer.h b/source/gameengine/Rasterizer/RAS_OpenGLRasterizer/RAS_OpenGLRasterizer.h
index 368bd4312ac..0717cce0ce8 100644
--- a/source/gameengine/Rasterizer/RAS_OpenGLRasterizer/RAS_OpenGLRasterizer.h
+++ b/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);