/*
 * Copyright 2011, Blender Foundation.
 *
 * This program 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 2
 * of the License, or (at your option) any later version.
 *
 * This program 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 this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */

#ifndef __OSL_SERVICES_H__
#define __OSL_SERVICES_H__

/* OSL Render Services
 *
 * Implementation of OSL render services, to retriever matrices, attributes,
 * textures and point clouds. In principle this should only be accessing
 * kernel data, but currently we also reach back into the Scene to retrieve
 * attributes.
 */

#include <OSL/oslexec.h>
#include <OSL/oslclosure.h>

#ifdef WITH_PARTIO
#include <Partio.h>
#endif

CCL_NAMESPACE_BEGIN

class Object;
class Scene;
class Shader;
class ShaderData;
class float3;
class KernelGlobals;

class OSLRenderServices : public OSL::RendererServices
{
public:
	OSLRenderServices();
	~OSLRenderServices();
	
	void thread_init(KernelGlobals *kernel_globals);

	bool get_matrix(OSL::Matrix44 &result, OSL::TransformationPtr xform, float time);
	bool get_inverse_matrix(OSL::Matrix44 &result, OSL::TransformationPtr xform, float time);
	bool get_matrix(OSL::Matrix44 &result, ustring from, float time);
	bool get_inverse_matrix(OSL::Matrix44 &result, ustring to, float time);

	bool get_array_attribute(void *renderstate, bool derivatives, 
		ustring object, TypeDesc type, ustring name,
		int index, void *val);
	bool get_attribute(void *renderstate, bool derivatives, ustring object,
		TypeDesc type, ustring name, void *val);

	bool get_userdata(bool derivatives, ustring name, TypeDesc type, 
		void *renderstate, void *val);
	bool has_userdata(ustring name, TypeDesc type, void *renderstate);

 	void *get_pointcloud_attr_query(ustring *attr_names,
		TypeDesc *attr_types, int nattrs);
	int pointcloud(ustring filename, const OSL::Vec3 &center, float radius,
		int max_points, void *attr_query, void **attr_outdata);

private:
	KernelGlobals *kernel_globals;

#ifdef WITH_PARTIO
	/* OSL gets pointers to this but its definition is private.
	   right now it only caches the types already converted to
	   Partio constants. this is what get_pointcloud_attr_query
	   returns */
	struct AttrQuery
	{
		/* names of the attributes to query */
		std::vector<ustring> attr_names;
		/* types as (enum Partio::ParticleAttributeType) of the
		   attributes in the query */
		std::vector<int> attr_partio_types;
		/* for sanity checks, capacity of the output arrays */
		int capacity;
	};

	Partio::ParticlesData *get_pointcloud(ustring filename);

	/* keep a list so adding elements doesn't invalidate pointers */
	std::list<AttrQuery> m_attr_queries;
#endif

	static ustring u_distance;
	static ustring u_index;
	static ustring u_camera;
	static ustring u_screen;
	static ustring u_raster;
	static ustring u_ndc;
	static ustring u_empty;
};

CCL_NAMESPACE_END

#endif /* __OSL_SERVICES_H__  */