Added method to alter the minimum vertex count required for a HW buffer to be created.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@2132 dfc29bdd-3216-0410-991c-e03cc46cb475

source/Irrlicht/CNullDriver.cpp

@@ -70,7 +70,8 @@ IImageWriter* createImageWriterPPM();
 //! constructor
 CNullDriver::CNullDriver(io::IFileSystem* io, const core::dimension2d<u32>& screenSize)
 : FileSystem(io), MeshManipulator(0), ViewPort(0,0,0,0), ScreenSize(screenSize),
-	PrimitivesDrawn(0), TextureCreationFlags(0), AllowZWriteOnTransparent(false)
+	PrimitivesDrawn(0), MinVertexCountForVBO(500), TextureCreationFlags(0),
+	AllowZWriteOnTransparent(false)
 {
 	#ifdef _DEBUG
 	setDebugName("CNullDriver");
@@ -1406,7 +1407,7 @@ bool CNullDriver::isHardwareBufferRecommend(const scene::IMeshBuffer* mb)
 	if (!mb || (mb->getHardwareMappingHint_Index()==scene::EHM_NEVER && mb->getHardwareMappingHint_Vertex()==scene::EHM_NEVER))
 		return false;
 
-	if (mb->getVertexCount()<500) //todo: tweak and make user definable
+	if (mb->getVertexCount()<MinVertexCountForVBO)
 		return false;
 
 	return true;
@@ -1941,9 +1942,6 @@ bool CNullDriver::setClipPlane(u32 index, const core::plane3df& plane, bool enab
 
 
 //! Enable/disable a clipping plane.
-//! There are at least 6 clipping planes available for the user to set at will.
-//! \param index: The plane index. Must be between 0 and MaxUserClipPlanes.
-//! \param enable: If true, enable the clipping plane else disable it.
 void CNullDriver::enableClipPlane(u32 index, bool enable)
 {
 	// not necessary
@@ -1959,5 +1957,11 @@ ITexture* CNullDriver::createRenderTargetTexture(const core::dimension2d<u32>& s
 	return tex;
 }
 
+
+void CNullDriver::setMinHardwareBufferVertexCount(u32 count)
+{
+	MinVertexCountForVBO = count;
+}
+
 } // end namespace
 } // end namespace

source/Irrlicht/CNullDriver.h

@@ -523,6 +523,10 @@ namespace video
 		//! Returns the graphics card vendor name.
 		virtual core::stringc getVendorInfo() {return "Not available on this driver.";}
 
+		//! Set the minimum number of vertices for which a hw buffer will be created
+		/** \param count Number of vertices to set as minimum. */
+		virtual void setMinHardwareBufferVertexCount(u32 count);
+
 		//! Only used by the engine internally.
 		virtual void setAllowZWriteOnTransparent(bool flag)
 		{ AllowZWriteOnTransparent=flag; }
@@ -633,6 +637,7 @@ namespace video
 		CFPSCounter FPSCounter;
 
 		u32 PrimitivesDrawn;
+		u32 MinVertexCountForVBO;
 
 		u32 TextureCreationFlags;
 
@@ -640,14 +645,13 @@ namespace video
 		f32 FogEnd;
 		f32 FogDensity;
 		SColor FogColor;
+		SExposedVideoData ExposedData;
+
 		bool LinearFog;
 		bool PixelFog;
 		bool RangeFog;
-
 		bool AllowZWriteOnTransparent;
 
-		SExposedVideoData ExposedData;
-
 		bool FeatureEnabled[video::EVDF_COUNT];
 	};