BansheeEngine/CamelotRenderer/Include/CmHighLevelGpuProgramManager.h

/*
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*/
#ifndef __HighLevelGpuProgramManager_H__
#define __HighLevelGpuProgramManager_H__

#include "CmPrerequisites.h"
#include "CmModule.h"
#include "CmException.h"
#include "CmHighLevelGpuProgram.h"

namespace CamelotEngine {

	/** \addtogroup Core
	*  @{
	*/
	/** \addtogroup Resources
	*  @{
	*/
	/** Interface definition for factories of HighLevelGpuProgram. */
	class CM_EXPORT HighLevelGpuProgramFactory
	{
	public:
        HighLevelGpuProgramFactory() {}
        virtual ~HighLevelGpuProgramFactory();
		/// Get the name of the language this factory creates programs for
		virtual const String& getLanguage(void) const = 0;
        virtual HighLevelGpuProgram* create(const String& source, const String& entryPoint, GpuProgramType gptype, GpuProgramProfile profile) = 0;
		virtual HighLevelGpuProgram* create() = 0;

		void destroy(HighLevelGpuProgram* prog);
		virtual void destroy_internal(HighLevelGpuProgram* prog) = 0;
	};
	/** This ResourceManager manages high-level vertex and fragment programs. 
	@remarks
		High-level vertex and fragment programs can be used instead of assembler programs
		as managed by GpuProgramManager; however they typically result in a GpuProgram
		being created as a derivative of the high-level program. High-level programs are
		easier to write, and can often be API-independent, unlike assembler programs. 
	@par
		This class not only manages the programs themselves, it also manages the factory
		classes which allow the creation of high-level programs using a variety of high-level
		syntaxes. Plugins can be created which register themselves as high-level program
		factories and as such the engine can be extended to accept virtually any kind of
		program provided a plugin is written.
	*/
	class CM_EXPORT HighLevelGpuProgramManager : public Module<HighLevelGpuProgramManager>
	{
	public:
		typedef map<String, HighLevelGpuProgramFactory*>::type FactoryMap;
	protected:
		/// Factories capable of creating HighLevelGpuProgram instances
		FactoryMap mFactories;

		/// Factory for dealing with programs for languages we can't create
		HighLevelGpuProgramFactory* mNullFactory;

		HighLevelGpuProgramFactory* getFactory(const String& language);
	public:
		HighLevelGpuProgramManager();
		~HighLevelGpuProgramManager();
		/** Add a new factory object for high-level programs of a given language. */
		void addFactory(HighLevelGpuProgramFactory* factory);
		/** Remove a factory object for high-level programs of a given language. */
		void removeFactory(HighLevelGpuProgramFactory* factory);

		/** Returns whether a given high-level language is supported. */
		bool isLanguageSupported(const String& lang);


        /** Create a new HighLevelGpuProgram. 
		@par
			This method creates a new program of the type specified as the second and third parameters.
		@param name The identifying name of the program
        @param groupName The name of the resource group which this program is
            to be a member of
		@param language Code of the language to use (e.g. "cg")
		@param gptype The type of program to create
		*/
		HighLevelGpuProgramPtr create(const String& source, const String& entryPoint, const String& language, GpuProgramType gptype, GpuProgramProfile profile);

		/** Create a new HighLevelGpuProgram. 
		@par
			This method creates a new program of the specified language. You need to set other 
			properties like source, entry point, type, profile manually.
		@param language Code of the language to use (e.g. "cg")
		*/
		HighLevelGpuProgramPtr create(const String& language);

		/**
		 * @brief	Creates a completely empty and uninitialized HighLevelGpuProgram.
		 * 			Should only be used for VERY specific purposes, like deserialization,
		 * 			as it requires additional manual initialization that is not required normally.
		 */
		HighLevelGpuProgramPtr createEmpty(const String& language);
	};
	/** @} */
	/** @} */

}

#endif