Method UpdateDirectionalShadowMaps

SDK/src/NDK/Systems/RenderSystem.cpp:272–314

	}

	void RenderSystem::UpdateDirectionalShadowMaps(const Nz::AbstractViewer& /*viewer*/)
	{
		if (!m_shadowRT.IsValid())
			m_shadowRT.Create();

		Nz::SceneData dummySceneData;
		dummySceneData.ambientColor = Nz::Color(0, 0, 0);
		dummySceneData.background = nullptr;
		dummySceneData.viewer = nullptr; //< Depth technique doesn't require any viewer

		for (const Ndk::EntityHandle& light : m_directionalLights)
		{
			LightComponent& lightComponent = light->GetComponent<LightComponent>();
			NodeComponent& lightNode = light->GetComponent<NodeComponent>();

			if (!lightComponent.IsShadowCastingEnabled())
				continue;

			Nz::Vector2ui shadowMapSize(lightComponent.GetShadowMap()->GetSize());

			m_shadowRT.AttachTexture(Nz::AttachmentPoint_Depth, 0, lightComponent.GetShadowMap());
			Nz::Renderer::SetTarget(&m_shadowRT);
			Nz::Renderer::SetViewport(Nz::Recti(0, 0, shadowMapSize.x, shadowMapSize.y));

			Nz::AbstractRenderQueue* renderQueue = m_shadowTechnique.GetRenderQueue();
			renderQueue->Clear();

			///TODO: Culling
			for (const Ndk::EntityHandle& drawable : m_drawables)
			{
				GraphicsComponent& graphicsComponent = drawable->GetComponent<GraphicsComponent>();

				graphicsComponent.AddToRenderQueue(renderQueue);
			}

			///TODO: Cache the matrices in the light?
			Nz::Renderer::SetMatrix(Nz::MatrixType_Projection, Nz::Matrix4f::Ortho(0.f, 100.f, 100.f, 0.f, 1.f, 100.f));
			Nz::Renderer::SetMatrix(Nz::MatrixType_View, Nz::Matrix4f::ViewMatrix(lightNode.GetRotation() * Nz::Vector3f::Forward() * 100.f, lightNode.GetRotation()));

			m_shadowTechnique.Clear(dummySceneData);
			m_shadowTechnique.Draw(dummySceneData);
		}
	}

	/*!
	* \brief Updates the point spot shadow maps