UPBGE: Fix draw quad to screen without face culling.

Previously it appears to draw a screen quad with the last culling settings.
Culling is not an issue but the culling faces and the front face are
important and can cause the quad to not be draft.
THis was noticed in background render not displayed or with a very basic
scene: a negative scale cube in an empty scene caused the final off screen
to not be draft to the screen due to culling settings.

To fix this issue we simply disable face culling before render any quad for
background render, filters, stereo resolve and off screen copy.

source/gameengine/Ketsji/KX_WorldInfo.cpp

@@ -209,12 +209,14 @@ void KX_WorldInfo::RenderBackground(RAS_IRasterizer *rasty)
 			static float texcofac[4] = { 0.0f, 0.0f, 1.0f, 1.0f };
 			GPU_material_bind(gpumat, 0xFFFFFFFF, m_scene->lay, 1.0f, false, viewmat, invviewmat, texcofac, false);
 
+			rasty->Disable(RAS_IRasterizer::RAS_CULL_FACE);
 			rasty->Enable(RAS_IRasterizer::RAS_DEPTH_TEST);
 			rasty->SetDepthFunc(RAS_IRasterizer::RAS_ALWAYS);
 
 			rasty->DrawOverlayPlane();
 
 			rasty->SetDepthFunc(RAS_IRasterizer::RAS_LEQUAL);
+			rasty->Enable(RAS_IRasterizer::RAS_CULL_FACE);
 
 			GPU_material_unbind(gpumat);
 		}

source/gameengine/Rasterizer/RAS_2DFilterManager.cpp

@@ -92,6 +92,7 @@ void RAS_2DFilterManager::RenderFilters(RAS_IRasterizer *rasty, RAS_ICanvas *can
 	unsigned short colorfbo = rasty->GetCurrentOffScreenIndex();
 	unsigned short depthfbo = colorfbo;
 
+	rasty->Disable(RAS_IRasterizer::RAS_CULL_FACE);
 	rasty->SetDepthFunc(RAS_IRasterizer::RAS_ALWAYS);
 	rasty->Disable(RAS_IRasterizer::RAS_BLEND);
 	rasty->Disable(RAS_IRasterizer::RAS_ALPHA_TEST);
@@ -137,6 +138,7 @@ void RAS_2DFilterManager::RenderFilters(RAS_IRasterizer *rasty, RAS_ICanvas *can
 	}
 
 	rasty->SetDepthFunc(RAS_IRasterizer::RAS_LEQUAL);
+	rasty->Enable(RAS_IRasterizer::RAS_CULL_FACE);
 }
 
 RAS_2DFilter *RAS_2DFilterManager::CreateFilter(RAS_2DFilterData& filterData)

source/gameengine/Rasterizer/RAS_OpenGLRasterizer/RAS_OpenGLRasterizer.cpp

@@ -904,12 +904,14 @@ void RAS_OpenGLRasterizer::DrawOffScreen(RAS_ICanvas *canvas, unsigned short ind
 	SetViewport(viewport[0], viewport[1], viewport[2], viewport[3]);
 	SetScissor(viewport[0], viewport[1], viewport[2], viewport[3]);
 
+	Disable(RAS_CULL_FACE);
 	SetDepthFunc(RAS_ALWAYS);
 
 	m_offScreens.RestoreScreen();
 	DrawOffScreen(index, 0);
 
 	SetDepthFunc(RAS_LEQUAL);
+	Enable(RAS_CULL_FACE);
 }
 
 void RAS_OpenGLRasterizer::DrawStereoOffScreen(RAS_ICanvas *canvas, unsigned short lefteyeindex, unsigned short righteyeindex)
@@ -930,6 +932,7 @@ void RAS_OpenGLRasterizer::DrawStereoOffScreen(RAS_ICanvas *canvas, unsigned sho
 	SetViewport(viewport[0], viewport[1], viewport[2], viewport[3]);
 	SetScissor(viewport[0], viewport[1], viewport[2], viewport[3]);
 
+	Disable(RAS_CULL_FACE);
 	SetDepthFunc(RAS_ALWAYS);
 
 	m_offScreens.RestoreScreen();
@@ -975,6 +978,7 @@ void RAS_OpenGLRasterizer::DrawStereoOffScreen(RAS_ICanvas *canvas, unsigned sho
 	}
 
 	SetDepthFunc(RAS_LEQUAL);
+	Enable(RAS_CULL_FACE);
 }
 
 void RAS_OpenGLRasterizer::BindOffScreenTexture(unsigned short index, unsigned short slot, OffScreen type)

source/gameengine/VideoTexture/ImageRender.cpp

@@ -302,8 +302,6 @@ bool ImageRender::Render()
 	m_rasterizer->SetViewport(m_position[0], m_position[1], m_position[0] + m_capSize[0], m_position[1] + m_capSize[1]);
 	m_rasterizer->SetScissor(m_position[0], m_position[1], m_position[0] + m_capSize[0], m_position[1] + m_capSize[1]);
 
-	m_rasterizer->SetClearColor(0.247784f, 0.247784f, 0.247784f, 1.0f);
-	m_rasterizer->Clear(RAS_IRasterizer::RAS_COLOR_BUFFER_BIT | RAS_IRasterizer::RAS_DEPTH_BUFFER_BIT);
 	m_rasterizer->BeginFrame(m_engine->GetClockTime());
 	m_scene->GetWorldInfo()->UpdateWorldSettings(m_rasterizer);
 	m_rasterizer->SetAuxilaryClientInfo(m_scene);
@@ -394,7 +392,7 @@ bool ImageRender::Render()
 	}
 
 	// Render Background
-	if (m_scene->GetWorldInfo()->m_hasworld) {
+	if (m_scene->GetWorldInfo()) {
 		const MT_Vector3 hor = m_scene->GetWorldInfo()->m_horizoncolor;
 		const MT_Vector3 zen = m_scene->GetWorldInfo()->m_zenithcolor;
 		m_scene->GetWorldInfo()->setHorizonColor(MT_Vector3(m_horizon[0], m_horizon[1], m_horizon[2]));