genesis-3d_engine/Engine/addons/shadercompiler/ShaderAnalyzer.cc

/****************************************************************************
Copyright (c) 2011-2013,WebJet Business Division,CYOU
 
http://www.genesis-3d.com.cn

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****************************************************************************/
#include "stdneb.h"
#include "ShaderAnalyzer.h"
#include "ShaderElement.h"
#include "shadercompiler/Utility/ShaderCompilerUtil.h"
#include "exception/exceptions.h"

namespace ShaderProgramCompiler
{
ShaderAnalyzer::ShaderAnalyzer()
: m_pShaderElement(NULL)
{

}

ShaderAnalyzer::~ShaderAnalyzer()
{
	if (m_pShaderElement != NULL)
	{
		n_delete(m_pShaderElement);
	}
}

void ShaderAnalyzer::_Prepare(const Util::String& content)
{
	m_OriginalContent = content;

	Util::String sourceCode = content;

	//<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>S
	static Util::String sBegin = "CODEBEGIN";
	static Util::String sEnd   = "CODEEND";

	IndexT begin = sourceCode.FindStringIndex(sBegin, 0);
	IndexT end   = sourceCode.FindStringIndex(sEnd, begin);

	if (begin != InvalidIndex && end != InvalidIndex)
	{
		m_CodeSegment = sourceCode.ExtractRange(begin + sBegin.Length(), end - (begin + sBegin.Length()) );
	} 
	else
	{

		SYS_EXCEPT(Exceptions::ShaderException, 
			STRING_FORMAT("Can not find CODEBEGIN or CODEEND! \n.", ""),
			GET_FUNCTION_NAME()
			);

	}
	
	sourceCode = sourceCode.EraseRange(begin, (end + sEnd.Length()) - begin);
	
	//<2F><><EFBFBD><EFBFBD>Compiler
	Util::String compiler;
	IndexT compilerBegin, compilerEnd;
	compilerBegin = sourceCode.FindStringIndex("Compiler");
	compilerEnd   = sourceCode.FindCharIndex('}', compilerBegin);

	if (compilerBegin == InvalidIndex || compilerEnd == InvalidIndex)
	{
		SYS_EXCEPT(Exceptions::ShaderException, 
			STRING_FORMAT("Can not find Compiler when parse shader! \n.", ""),
			GET_FUNCTION_NAME()
			);
	
	} 

	compiler      = sourceCode.ExtractRange(compilerBegin, compilerEnd - compilerBegin + 1);

	sourceCode = sourceCode.EraseRange(compilerBegin,  (compilerEnd+1) - compilerBegin );
	Util::String sWithoutCodeAndCompiler = sourceCode;

	//<2F><><EFBFBD><EFBFBD>RenderState
	Util::String renderState;
	IndexT renderStateBegin, renderStateEnd;
	renderStateBegin = sourceCode.FindStringIndex("RenderSTATE");
	renderStateEnd   = sourceCode.FindCharIndex('}', renderStateBegin);

	if (renderStateBegin == InvalidIndex || renderStateEnd == InvalidIndex)
	{

		SYS_EXCEPT(Exceptions::ShaderException, 
			STRING_FORMAT("Can not find RenderState when parse shader! \n.", ""),
			GET_FUNCTION_NAME()
			);

	}

	renderState = sourceCode.ExtractRange(renderStateBegin, renderStateEnd - renderStateBegin + 1);

	sWithoutCodeAndCompiler = sWithoutCodeAndCompiler.InsertRange(renderStateEnd+1, "\n \n \n \n #CODE \n");

	sourceCode = sourceCode.EraseRange(renderStateBegin,  (renderStateEnd+1) - renderStateBegin );

	//<2F><><EFBFBD><EFBFBD>Pass
	Util::String sPass;
	IndexT passBegin, passEnd;
	passBegin = sourceCode.FindStringIndex("Pass");
	passEnd   = sourceCode.FindCharIndex('}', passBegin);

	if (passBegin == InvalidIndex || passEnd == InvalidIndex)
	{
		
		SYS_EXCEPT(Exceptions::ShaderException, 
			STRING_FORMAT("Can not find Pass in shader! \n.", ""),
			GET_FUNCTION_NAME()
			);

	} 

	sPass     = sourceCode.ExtractRange(passBegin, passEnd - passBegin + 1);

	sourceCode = sourceCode.EraseRange(passBegin,  (passEnd+1) - passBegin );

	//<2F><><EFBFBD><EFBFBD>Technique
	Util::String sTech;
	IndexT techBegin, techEnd;
	techBegin = sourceCode.FindStringIndex("Technique");
	techEnd   = sourceCode.FindCharIndex('}', techBegin);

	if (techBegin == InvalidIndex || techEnd == InvalidIndex)
	{
		SYS_EXCEPT(Exceptions::ShaderException, 
			STRING_FORMAT("Can not find Pass in shader! \n.", ""),
			GET_FUNCTION_NAME()
			);
	}

	sTech     = sourceCode.ExtractRange(techBegin, techEnd - techBegin + 1);

	m_pShaderElement = ShaderElement::Create();
	GPtr<ShaderTechnique> pTech = ShaderTechnique::Create();
	GPtr<ShaderPass>      pPass = ShaderPass::Create();


	pPass->SetRenderState(renderState);
	pPass->SetCompiler(compiler);
	pPass->SetCode(m_CodeSegment);


	pTech->AddShaderPass(pPass);
	pTech->SetRawTechSegment(sWithoutCodeAndCompiler);

	m_pShaderElement->AddShaderTechnique(pTech);

}

bool ShaderAnalyzer::Parse(const Util::String& content)
{
	_Prepare(content);

	m_pShaderElement->Parse();

	return true;
}

void ShaderAnalyzer::Compile(GpuProgramCompiler* pCompiler)
{
	m_pShaderElement->Compile(pCompiler);
}

void ShaderAnalyzer::Finish()
{
	m_pShaderElement->Finish();
}

Util::String ShaderAnalyzer::GetResult() const
{
	return m_pShaderElement->GetResult();
}

}