Add setRenderTarget interface taking an ITexture back in as wrapper.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@5073 dfc29bdd-3216-0410-991c-e03cc46cb475

include/IVideoDriver.h

@@ -556,6 +556,42 @@ namespace video
 			return setRenderTarget(target, idArray, clearBackBuffer, clearDepthBuffer, clearStencilBuffer, clearColor);
 		}
 
+		//! Sets a new render target.
+		/** This will only work if the driver supports the
+		EVDF_RENDER_TO_TARGET feature, which can be queried with
+		queryFeature(). Usually, rendering to textures is done in this
+		way:
+		\code
+		// create render target
+		ITexture* target = driver->addRenderTargetTexture(core::dimension2d<u32>(128,128), "rtt1");
+
+		// ...
+
+		driver->setRenderTarget(target); // set render target
+		// .. draw stuff here
+		driver->setRenderTarget(0); // set previous render target
+		\endcode
+		Please note that you cannot render 3D or 2D geometry with a
+		render target as texture on it when you are rendering the scene
+		into this render target at the same time. It is usually only
+		possible to render into a texture between the
+		IVideoDriver::beginScene() and endScene() method calls.
+		\param texture New render target. Must be a texture created with
+		IVideoDriver::addRenderTargetTexture(). If set to 0, it sets
+		the previous render target which was set before the last
+		setRenderTarget() call.
+		\param clearBackBuffer Clears the backbuffer of the render
+		target with the color parameter
+		\param clearZBuffer Clears the zBuffer of the rendertarget.
+		Note that because the frame buffer may share the zbuffer with
+		the rendertarget, its zbuffer might be partially cleared too
+		by this.
+		\param color The background color for the render target.
+		\return True if sucessful and false if not. */
+		virtual bool setRenderTarget(video::ITexture* texture,
+			bool clearBackBuffer = true, bool clearZBuffer = true,
+			SColor color = video::SColor(0, 0, 0, 0)) = 0;
+
 		//! Sets a new viewport.
 		/** Every rendering operation is done into this new area.
 		\param area: Rectangle defining the new area of rendering

source/Irrlicht/CD3D9Driver.cpp

@@ -2133,7 +2133,7 @@ void CD3D9Driver::setBasicRenderStates(const SMaterial& material, const SMateria
 //	if (resetAllRenderstates || (lastmaterial.ZWriteEnable != material.ZWriteEnable))
 	{
 		if (material.ZWriteEnable && (AllowZWriteOnTransparent || (!material.isTransparent() &&
-			!MaterialRenderers[material.MaterialType].Renderer->isTransparent())))
+ 			!MaterialRenderers[material.MaterialType].Renderer->isTransparent())))
 		{
 			pID3DDevice->SetRenderState( D3DRS_ZWRITEENABLE, TRUE);
 		}

source/Irrlicht/CNullDriver.cpp

@@ -83,7 +83,7 @@ IImageWriter* createImageWriterPPM();
 
 //! constructor
 CNullDriver::CNullDriver(io::IFileSystem* io, const core::dimension2d<u32>& screenSize)
-	: CurrentRenderTarget(0), CurrentRenderTargetSize(0, 0), FileSystem(io), MeshManipulator(0),
+	: TextureRenderTarget(0), CurrentRenderTarget(0), CurrentRenderTargetSize(0, 0), FileSystem(io), MeshManipulator(0),
 	ViewPort(0, 0, 0, 0), ScreenSize(screenSize), PrimitivesDrawn(0), MinVertexCountForVBO(500),
 	TextureCreationFlags(0), OverrideMaterial2DEnabled(false), AllowZWriteOnTransparent(false)
 {
@@ -213,6 +213,9 @@ CNullDriver::~CNullDriver()
 	if (MeshManipulator)
 		MeshManipulator->drop();
 
+	if (TextureRenderTarget)
+		TextureRenderTarget->drop();
+
 	removeAllRenderTargets();
 
 	deleteAllTextures();
@@ -624,6 +627,25 @@ bool CNullDriver::setRenderTarget(IRenderTarget* target, core::array<u32> active
 	return false;
 }
 
+bool CNullDriver::setRenderTarget(video::ITexture* texture, bool clearBackBuffer, bool clearZBuffer, SColor color)
+{
+	if (texture)
+	{
+		if (!TextureRenderTarget)
+		{
+			// (there's no createRenderTarget)
+			TextureRenderTarget = addRenderTarget();
+			TextureRenderTarget->grab();
+			removeRenderTarget(TextureRenderTarget);
+		}
+
+		return setRenderTarget(TextureRenderTarget, 0, clearBackBuffer, clearZBuffer, clearZBuffer, color);
+	}
+	else
+	{
+		return setRenderTarget(NULL, 0, clearBackBuffer, clearZBuffer, clearZBuffer, color);
+	}
+}
 
 //! sets a viewport
 void CNullDriver::setViewPort(const core::rect<s32>& area)

source/Irrlicht/CNullDriver.h

@@ -104,6 +104,11 @@ namespace video
 		virtual bool setRenderTarget(IRenderTarget* target, core::array<u32> activeTextureID, bool clearBackBuffer,
 			bool clearDepthBuffer, bool clearStencilBuffer, SColor clearColor) _IRR_OVERRIDE_;
 
+		//! set a render target
+		virtual bool setRenderTarget(video::ITexture* texture,
+			bool clearBackBuffer = true, bool clearZBuffer = true,
+			SColor color = video::SColor(0, 0, 0, 0)) _IRR_OVERRIDE_;
+
 		//! sets a viewport
 		virtual void setViewPort(const core::rect<s32>& area) _IRR_OVERRIDE_;
 
@@ -804,6 +809,7 @@ namespace video
 		core::array<SOccQuery> OcclusionQueries;
 
 		core::array<IRenderTarget*> RenderTargets;
+		IRenderTarget* TextureRenderTarget;	// A default rendertarget for rendering to single textures.
 
 		IRenderTarget* CurrentRenderTarget;
 		core::dimension2d<u32> CurrentRenderTargetSize;