assimp/code/MD3Loader.h

/*
Open Asset Import Library (assimp)
----------------------------------------------------------------------

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All rights reserved.

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  copyright notice, this list of conditions and the
  following disclaimer.

* Redistributions in binary form must reproduce the above
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*/

/** @file  Md3Loader.h
 *  @brief Declaration of the .MD3 importer class.
 */
#ifndef AI_MD3LOADER_H_INCLUDED
#define AI_MD3LOADER_H_INCLUDED

#include "BaseImporter.h"
#include "ByteSwapper.h"
#include "MD3FileData.h"
#include "StringComparison.h"
#include "../include/assimp/types.h"

#include <list>

struct aiMaterial;

namespace Assimp	{


using namespace MD3;
namespace Q3Shader {

// ---------------------------------------------------------------------------
/** @brief Tiny utility data structure to hold the data of a .skin file
 */
struct SkinData
{
	//! A single entryin texture list
	struct TextureEntry : public std::pair<std::string,std::string>
	{
		// did we resolve this texture entry?
		bool resolved;

		// for std::find()
		bool operator == (const std::string& f) const {
			return f == first;
		}
	};

	//! List of textures
	std::list<TextureEntry> textures;

	// rest is ignored for the moment
};

// ---------------------------------------------------------------------------
/** @brief Specifies cull modi for Quake shader files.
 */
enum ShaderCullMode
{
	CULL_NONE,
	CULL_CW,
	CULL_CCW
};

// ---------------------------------------------------------------------------
/** @brief Specifies alpha blend modi (src + dest) for Quake shader files
 */
enum BlendFunc
{
	BLEND_NONE,
	BLEND_GL_ONE,
	BLEND_GL_ZERO,
	BLEND_GL_DST_COLOR,
	BLEND_GL_ONE_MINUS_DST_COLOR,
	BLEND_GL_SRC_ALPHA,
	BLEND_GL_ONE_MINUS_SRC_ALPHA
};

// ---------------------------------------------------------------------------
/** @brief Specifies alpha test modi for Quake texture maps
 */
enum AlphaTestFunc
{
	AT_NONE,
	AT_GT0,
	AT_LT128,
	AT_GE128
};

// ---------------------------------------------------------------------------
/** @brief Tiny utility data structure to hold a .shader map data block
 */
struct ShaderMapBlock
{
	ShaderMapBlock()
		 :	blend_src	(BLEND_NONE)
		 ,	blend_dest	(BLEND_NONE)
		 ,	alpha_test	(AT_NONE)
	{}

	//! Name of referenced map
	std::string name;

	//! Blend and alpha test settings for texture
	BlendFunc blend_src,blend_dest;
	AlphaTestFunc alpha_test;


	//! For std::find()
	bool operator== (const std::string& o) const {
		return !ASSIMP_stricmp(o,name);
	}
};

// ---------------------------------------------------------------------------
/** @brief Tiny utility data structure to hold a .shader data block
 */
struct ShaderDataBlock
{
	ShaderDataBlock()
		:	cull	(CULL_CW)
	{}

	//! Name of referenced data element
	std::string name;

	//! Cull mode for the element
	ShaderCullMode cull;

	//! Maps defined in the shader
	std::list<ShaderMapBlock> maps;


	//! For std::find()
	bool operator== (const std::string& o) const {
		return !ASSIMP_stricmp(o,name);
	}
};

// ---------------------------------------------------------------------------
/** @brief Tiny utility data structure to hold the data of a .shader file
 */
struct ShaderData
{
	//! Shader data blocks
	std::list<ShaderDataBlock> blocks;
};

// ---------------------------------------------------------------------------
/** @brief Load a shader file
 *
 *  Generally, parsing is error tolerant. There's no failure.
 *  @param fill Receives output data
 *  @param file File to be read.
 *  @param io IOSystem to be used for reading
 *  @return false if file is not accessible
 */
bool LoadShader(ShaderData& fill, const std::string& file,IOSystem* io);


// ---------------------------------------------------------------------------
/** @brief Convert a Q3Shader to an aiMaterial
 *
 *  @param[out] out Material structure to be filled.
 *  @param[in] shader Input shader
 */
void ConvertShaderToMaterial(aiMaterial* out, const ShaderDataBlock& shader);

// ---------------------------------------------------------------------------
/** @brief Load a skin file
 *
 *  Generally, parsing is error tolerant. There's no failure.
 *  @param fill Receives output data
 *  @param file File to be read.
 *  @param io IOSystem to be used for reading
 *  @return false if file is not accessible
 */
bool LoadSkin(SkinData& fill, const std::string& file,IOSystem* io);

} // ! namespace Q3SHader

// ---------------------------------------------------------------------------
/** @brief Importer class to load MD3 files
*/
class MD3Importer : public BaseImporter
{
public:
	MD3Importer();
	~MD3Importer();


public:

	// -------------------------------------------------------------------
	/** Returns whether the class can handle the format of the given file.
	* See BaseImporter::CanRead() for details.	*/
	bool CanRead( const std::string& pFile, IOSystem* pIOHandler,
		bool checkSig) const;


	// -------------------------------------------------------------------
	/** Called prior to ReadFile().
	* The function is a request to the importer to update its configuration
	* basing on the Importer's configuration property list.
	*/
	void SetupProperties(const Importer* pImp);

protected:

	// -------------------------------------------------------------------
	/** Return importer meta information.
	 * See #BaseImporter::GetInfo for the details
	 */
	const aiImporterDesc* GetInfo () const;

	// -------------------------------------------------------------------
	/** Imports the given file into the given scene structure.
	 * See BaseImporter::InternReadFile() for details
	 */
	void InternReadFile( const std::string& pFile, aiScene* pScene,
		IOSystem* pIOHandler);

	// -------------------------------------------------------------------
	/** Validate offsets in the header
	 */
	void ValidateHeaderOffsets();
	void ValidateSurfaceHeaderOffsets(const MD3::Surface* pcSurfHeader);

	// -------------------------------------------------------------------
	/** Read a Q3 multipart file
	 *  @return true if multi part has been processed
	 */
	bool ReadMultipartFile();

	// -------------------------------------------------------------------
	/** Try to read the skin for a MD3 file
	 *  @param fill Receives output information
	 */
	void ReadSkin(Q3Shader::SkinData& fill) const;

	// -------------------------------------------------------------------
	/** Try to read the shader for a MD3 file
	 *  @param fill Receives output information
	 */
	void ReadShader(Q3Shader::ShaderData& fill) const;

	// -------------------------------------------------------------------
	/** Convert a texture path in a MD3 file to a proper value
	 *  @param[in] texture_name Path to be converted
	 *  @param[in] header_path Base path specified in MD3 header
	 *  @param[out] out Receives the converted output string
	 */
	void ConvertPath(const char* texture_name, const char* header_path,
		std::string& out) const;

protected:

	/** Configuration option: frame to be loaded */
	unsigned int configFrameID;

	/** Configuration option: process multi-part files */
	bool configHandleMP;

	/** Configuration option: name of skin file to be read */
	std::string configSkinFile;

	/** Configuration option: name or path of shader */
	std::string configShaderFile;

	/** Configuration option: speed flag was set? */
	bool configSpeedFlag;

	/** Header of the MD3 file */
	BE_NCONST MD3::Header* pcHeader;

	/** File buffer  */
	BE_NCONST unsigned char* mBuffer;

	/** Size of the file, in bytes */
	unsigned int fileSize;

	/** Current file name */
	std::string mFile;

	/** Current base directory  */
	std::string path;

	/** Pure file we're currently reading */
	std::string filename;

	/** Output scene to be filled */
	aiScene* mScene;

	/** IO system to be used to access the data*/
	IOSystem* mIOHandler;
	};

} // end of namespace Assimp

#endif // AI_3DSIMPORTER_H_INC