Example #1
0
	void CPointLightNode::generateShadowMap(ICameraNode* viewCamera)
	{
		ITextureManager* tmgr = ITextureManager::getInstance();
		if (mCastShadow)
		{
			if (!mShadowMapTexture)
			{
				std::string name = "_point_shadow_map_";
				name += getId();

				mShadowMapTexture = tmgr->createTextureCube(name, mShadowMapWidth,
					ETBT_SHADER_RESOURCE | ETBT_RENDER_TARGET, nullptr, 1, EGF_R32_FLOAT);
			}

			ICameraNode* camera = mSceneManager->getActiveCameraNode();
			camera->setPerspectiveProjection(true);

			XMFLOAT3 pos = getAbsolutePosition();
			camera->setPosition(pos);
			camera->setFovAngle(XM_PIDIV2);
			camera->setNearZ(0.1f);
			camera->setFarZ(mLightData.Range);
			camera->setAspectRatio(1.0f);

			//const 
			const static XMFLOAT3 looks[] = {
				XMFLOAT3(1.0f, 0, 0),					//+x
				XMFLOAT3(-1.0f, 0, 0),					//-x
				XMFLOAT3(0, 1.0f, 0),					//+y
				XMFLOAT3(0, -1.0f, 0),					//-y
				XMFLOAT3(0, 0, 1.0f),					//+z
				XMFLOAT3(0, 0, -1.0f)					//-z
			};

			const static XMFLOAT3 ups[] = {
				XMFLOAT3(0.0f, 1.0f, 0.0f),  // +X
				XMFLOAT3(0.0f, 1.0f, 0.0f),  // -X
				XMFLOAT3(0.0f, 0.0f, -1.0f), // +Y
				XMFLOAT3(0.0f, 0.0f, +1.0f), // -Y
				XMFLOAT3(0.0f, 1.0f, 0.0f),	 // +Z
				XMFLOAT3(0.0f, 1.0f, 0.0f)	 // -Z
			};

			IVideoDriver* driver = mSceneManager->getVideoDriver();
			IDepthStencilSurface* pDepthStencilSurface = tmgr->getTempDepthStencilSurface(
				mShadowMapWidth, mShadowMapWidth, 32, 0);
			
			driver->setPipelineUsage(EPU_POINT_SHADOW_MAP);

			for (u32 i = 0; i < 6; i++)
			{
				camera->look(looks[i], ups[i]);
				camera->updateAbsoluteTransformation();
				IRenderTarget* pRenderTarget = mShadowMapTexture->getRenderTarget(i);
				driver->setRenderTargetAndDepthStencil(pRenderTarget, pDepthStencilSurface);
				
				const f32 clearColor[] = { 1000.0f, 1000.0f, 1000.0f, 1000.0f };
				pRenderTarget->clear(clearColor);
				driver->clearDepthStencil(1.0f, 0);
				mSceneManager->drawShadowMap(this);
			}

			tmgr->releaseTempDepthStencilSurface(pDepthStencilSurface);
		}
	}