text: /*
  -----------------------------------------------------------------------------
  This source file is part of OGRE
      (Object-oriented Graphics Rendering Engine)
  For the latest info, see http://www.ogre3d.org/
  
  Copyright (c) 2000-2014 Torus Knot Software Ltd
  
  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to deal
  in the Software without restriction, including without limitation the rights
  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  copies of the Software, and to permit persons to whom the Software is
  furnished to do so, subject to the following conditions:
  
  The above copyright notice and this permission notice shall be included in
  all copies or substantial portions of the Software.
  
  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  THE SOFTWARE.
  -----------------------------------------------------------------------------
  */
  #ifndef __HighLevelGpuProgram_H__
  #define __HighLevelGpuProgram_H__
  
  #include "OgrePrerequisites.h"
  #include "OgreGpuProgram.h"
  #include "OgreHeaderPrefix.h"
  
  namespace Ogre {
  
      /** \addtogroup Core
      *  @{
      */
      /** \addtogroup Resources
      *  @{
      */
      /** Abstract base class representing a high-level program (a vertex or
          fragment program).
      @remarks
          High-level programs are vertex and fragment programs written in a high-level
          language such as Cg or HLSL, and as such do not require you to write assembler code
          like GpuProgram does. However, the high-level program does eventually 
          get converted (compiled) into assembler and then eventually microcode which is
          what runs on the GPU. As well as the convenience, some high-level languages like Cg allow
          you to write a program which will operate under both Direct3D and OpenGL, something
          which you cannot do with just GpuProgram (which requires you to write 2 programs and
          use each in a Technique to provide cross-API compatibility). Ogre will be creating
          a GpuProgram for you based on the high-level program, which is compiled specifically 
          for the API being used at the time, but this process is transparent.
      @par
          You cannot create high-level programs direct - use HighLevelGpuProgramManager instead.
          Plugins can register new implementations of HighLevelGpuProgramFactory in order to add
          support for new languages without requiring changes to the core Ogre API. To allow 
          custom parameters to be set, this class extends StringInterface - the application
          can query on the available custom parameters and get/set them without having to 
          link specifically with it.
      */
      class _OgreExport HighLevelGpuProgram : public GpuProgram
      {
      protected:
          /// Whether the high-level program (and it's parameter defs) is loaded
          bool mHighLevelLoaded;
          /// Have we built the name->index parameter map yet?
          bool mConstantDefsBuilt;
          /// The underlying assembler program
          GpuProgramPtr mAssemblerProgram;
          /// Preprocessor options
          String mPreprocessorDefines;
  
          /// in-situ parsing of defines
          static std::vector<std::pair<const char*, const char*>> parseDefines(String& defines);
  
          String appendBuiltinDefines(String defines);
  
          /// Internal load high-level portion if not loaded
          virtual void loadHighLevel(void);
          /// Internal unload high-level portion if loaded
          virtual void unloadHighLevel(void);
          /** Internal method for creating an appropriate low-level program from this
          high-level program, must be implemented by subclasses. */
          virtual void createLowLevelImpl(void) = 0;
          /// Internal unload implementation, must be implemented by subclasses
          virtual void unloadHighLevelImpl(void) = 0;
          /// Populate the passed parameters with name->index map
          void populateParameterNames(GpuProgramParametersSharedPtr params);
          /** Build the constant definition map, must be overridden.
          @note The implementation must fill in the (inherited) mConstantDefs field at a minimum, 
              and if the program requires that parameters are bound using logical 
              parameter indexes then the mLogicalToPhysical and mIntLogicalToPhysical
              maps must also be populated.
          */
          virtual void buildConstantDefinitions() = 0;
  
          /** @copydoc Resource::loadImpl */
          void loadImpl();
          /** @copydoc Resource::unloadImpl */
          void unloadImpl();
  
          void setupBaseParamDictionary();
      public:
          /** Constructor, should be used only by factory classes. */
          HighLevelGpuProgram(ResourceManager* creator, const String& name, ResourceHandle handle,
              const String& group, bool isManual = false, ManualResourceLoader* loader = 0);
          ~HighLevelGpuProgram();
  
  
          /** Creates a new parameters object compatible with this program definition. 
          @remarks
              Unlike low-level assembly programs, parameters objects are specific to the
              program and therefore must be created from it rather than by the 
              HighLevelGpuProgramManager. This method creates a new instance of a parameters
              object containing the definition of the parameters this program understands.
          */
          GpuProgramParametersSharedPtr createParameters(void);
          /** @copydoc GpuProgram::_getBindingDelegate */
          GpuProgram* _getBindingDelegate(void) { return mAssemblerProgram.get(); }
  
          /** Get the full list of GpuConstantDefinition instances.
          @note
          Only available if this parameters object has named parameters.
          */
          const GpuNamedConstants& getConstantDefinitions() override;
  
          virtual size_t calculateSize(void) const;
  
          /** Sets the preprocessor defines used to compile the program. */
          void setPreprocessorDefines(const String& defines) { mPreprocessorDefines = defines; }
          /** Gets the preprocessor defines used to compile the program. */
          const String& getPreprocessorDefines(void) const { return mPreprocessorDefines; }
  
          /// Scan the source for \#include and replace with contents from OGRE resources
          static String _resolveIncludes(const String& source, Resource* resourceBeingLoaded, const String& fileName, bool supportsFilename = false);
      };
      /** @} */
      /** @} */
  
  }
  
  #include "OgreHeaderSuffix.h"
  
  #endif
  