/*
 Copyright (c) 2013 yvt
 
 This file is part of OpenSpades.
 
 OpenSpades is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.
 
 OpenSpades is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.
 
 You should have received a copy of the GNU General Public License
 along with OpenSpades.  If not, see <http://www.gnu.org/licenses/>.
 
 */

#include <stdint.h>
#include "IGLShadowMapRenderer.h"
#include "IGLDevice.h"

namespace spades {
	namespace draw {
		class GLRenderer;
		class GLShadowShader;
		class GLSparseShadowMapRenderer: public IGLShadowMapRenderer {
			friend class GLShadowMapShader;
			friend class GLShadowShader;
			
			struct ModelRenderer;
			struct Internal;
			
			enum {Tiles = 64};
			
			IGLDevice *device;
			
			int textureSize;
			int minLod;
			int maxLod;
			
			uint32_t pagetable[Tiles][Tiles];
			
			IGLDevice::UInteger framebuffer;
			IGLDevice::UInteger texture;
			IGLDevice::UInteger pagetableTexture;
			
			// not used, but required
			IGLDevice::UInteger colorTexture;
			
			Matrix4 matrix;
			OBB3 obb;
			float vpWidth, vpHeight; // used for culling
			
			void BuildMatrix(float near, float far);
		protected:
			virtual void RenderShadowMapPass();
		public:
			
			GLSparseShadowMapRenderer(GLRenderer *);
			virtual ~GLSparseShadowMapRenderer();
			virtual void Render();
			
			virtual bool Cull(const AABB3&);
			virtual bool SphereCull(const Vector3& center, float rad);
		};
	}
}