binaries/assimp-3.1.1/tools/assimp_view/MaterialManager.h

/*
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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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*/

#if (!defined AV_MATERIAL_H_INCLUDED)
#define AV_MATERIAL_H_INCLUDE

//-------------------------------------------------------------------------------
/* Helper class to create, access and destroy materials
*/
//-------------------------------------------------------------------------------
class CMaterialManager
{
private:

	friend class CDisplay;

	// default constructor
	CMaterialManager() 
		:	m_iShaderCount (0), sDefaultTexture() {}

	~CMaterialManager() {
		if (sDefaultTexture) {
			sDefaultTexture->Release();
		}
		Reset();
	}

public:

	//------------------------------------------------------------------
	// Singleton accessors
	static CMaterialManager s_cInstance;
	inline static CMaterialManager& Instance ()
		{
		return s_cInstance;
		}

	//------------------------------------------------------------------
	// Delete all resources of a given material
	//
	// Must be called before CreateMaterial() to prevent memory leaking
	void DeleteMaterial(AssetHelper::MeshHelper* pcIn);
	
	//------------------------------------------------------------------
	// Create the material for a mesh.
	//
	// The function checks whether an identical shader is already in use.
	// A shader is considered to be identical if it has the same input 
	// signature and takes the same number of texture channels.
	int CreateMaterial(AssetHelper::MeshHelper* pcMesh,
		const aiMesh* pcSource);

	//------------------------------------------------------------------
	// Setup the material for a given mesh
	// pcMesh Mesh to be rendered
	// pcProj Projection matrix
	// aiMe Current world matrix
	// pcCam Camera matrix
	// vPos Position of the camera
	// TODO: Extract camera position from matrix ...
	//
	int SetupMaterial (AssetHelper::MeshHelper* pcMesh,
		const aiMatrix4x4& pcProj,
		const aiMatrix4x4& aiMe,
		const aiMatrix4x4& pcCam,
		const aiVector3D& vPos);

	//------------------------------------------------------------------
	// End the material for a given mesh
	// Called after mesh rendering is complete
	// pcMesh Mesh object
	int EndMaterial (AssetHelper::MeshHelper* pcMesh);

	//------------------------------------------------------------------
	// Recreate all specular materials depending on the current 
	// specularity settings
	//
	// Diffuse-only materials are ignored.
	// Must be called after specular highlights have been toggled
	int UpdateSpecularMaterials();

	//------------------------------------------------------------------
	// find a valid path to a texture file
	//
	// Handle 8.3 syntax correctly, search the environment of the
	// executable and the asset for a texture with a name very similar 
	// to a given one
	int FindValidPath(aiString* p_szString);

	//------------------------------------------------------------------
	// Load a texture into memory and create a native D3D texture resource
	//
	// The function tries to find a valid path for a texture
	int LoadTexture(IDirect3DTexture9** p_ppiOut,aiString* szPath);


	//------------------------------------------------------------------
	// Getter for m_iShaderCount
	//
	inline unsigned int GetShaderCount()
	{
		return this->m_iShaderCount;
	}

	//------------------------------------------------------------------
	// Reset the state of the class
	// Called whenever a new asset is loaded
	inline void Reset()
	{
		this->m_iShaderCount = 0;
		for (TextureCache::iterator it = sCachedTextures.begin(); it != sCachedTextures.end(); ++it) {
			(*it).second->Release();
		}
		sCachedTextures.clear();
	}

private:

	//------------------------------------------------------------------
	// find a valid path to a texture file
	//
	// Handle 8.3 syntax correctly, search the environment of the
	// executable and the asset for a texture with a name very similar 
	// to a given one
	bool TryLongerPath(char* szTemp,aiString* p_szString);

	//------------------------------------------------------------------
	// Setup the default texture for a texture channel
	//
	// Generates a default checker pattern for a texture
	int SetDefaultTexture(IDirect3DTexture9** p_ppiOut);

	//------------------------------------------------------------------
	// Convert a height map to a normal map if necessary
	//
	// The function tries to detect the type of a texture automatically.
	// However, this wont work in every case.
	void HMtoNMIfNecessary(IDirect3DTexture9* piTexture,
		IDirect3DTexture9** piTextureOut,
		bool bWasOriginallyHM = true);

	//------------------------------------------------------------------
	// Search for non-opaque pixels in a texture
	//
	// A pixel is considered to be non-opaque if its alpha value is
	// less than 255
	//------------------------------------------------------------------
	bool HasAlphaPixels(IDirect3DTexture9* piTexture);

private:

	//
	// Specifies the number of different shaders generated for
	// the current asset. This number is incremented by CreateMaterial()
	// each time a shader isn't found in cache and needs to be created
	//
	unsigned int m_iShaderCount;
	IDirect3DTexture9* sDefaultTexture;

	typedef std::map<std::string,IDirect3DTexture9*> TextureCache;
	TextureCache sCachedTextures;
};

#endif //!! include guard