///////////////////////////////////////////////////////////////////////////
//	File : RCKShaderCG.h												 //
//	Author : Florian Delizy												 //	
//																		 //	
//	Virtools SDK : Implementation of CG shaders							 //	
//  Provides backward compatibility from the CgFX 1.2.1 to CgFX 1.1		 //
//																		 // 
//	Copyright (c) Virtools 2003, All Rights Reserved.					 //
///////////////////////////////////////////////////////////////////////////


#include "CgFXCompat.h"



//
// CgFXEffectHelper : used to manage parameters using CgFX 1.1 (useless in 1.2)
//
// Constructor parse the params of the effect, should be recreated after 
// every compilation of the shader
// iEffect : the CgFX object to use

CgFXEffectHelper::CgFXEffectHelper(ICgFXEffect * iEffect)
{

	XASSERT(iEffect);
	m_Effect = iEffect;

	#ifndef	USE_CGFX_121
		_ParseParams();
	#endif
}


// 
// Destroy the data of the object
//

CgFXEffectHelper::~CgFXEffectHelper(void)
{
	
	m_Effect = NULL;

	#ifndef USE_CGFX_121
		m_names.Clear();
		m_semantics.Clear();
	#endif
}



#ifndef USE_CGFX_121 // This part is useless with CgFX 1.2.1

//
// Parse the parameters from the m_Effect var
//
void CgFXEffectHelper::_ParseParams(void)
{
	CgFXEFFECT_DESC desc;
	HRESULT hr;

	XASSERT(m_Effect);

	hr = m_Effect->GetDesc(&desc);
	XASSERT(hr);

	for (UINT i = 0; i < desc.Parameters; i++)
	{
		CgFXPARAMETER_DESC pdesc;
		
		hr = m_Effect->GetParameterDesc( (CGFXHANDLE) i, &pdesc);
		
		m_names.PushBack(Pair(XString(pdesc.Name), (CGFXHANDLE) i));

		if (pdesc.Semantic) m_semantics.PushBack(Pair(XString(pdesc.Semantic), (CGFXHANDLE) i));
	}
	
}

//
// Get the parameter by looking in the table 
//

CGFXHANDLE CgFXEffectHelper::GetParameterBySemantic(const XString & semantic)
{
	int nbs = m_semantics.Size();
	for (int i = 0; i < nbs; i++)
	{
		if (m_semantics[i].string == semantic) return m_semantics[i].handle;
	}
	return NULL;
}


// Get the parameter given its name (table lookup)

CGFXHANDLE CgFXEffectHelper::GetParameterByName( const XString name)
{
	int nbs = m_names.Size();
	for (int i = 0; i < nbs; i++)
	{
		if (m_names[i].string == name) return m_names[i].handle;
	}
	return NULL;
}



#endif // #ifndef USE_CGFX_121