Method MapPassParameters

trinity/Shader/Tr2Effect.cpp:1722–2027

-------------------------------------------------------------------------------------- Description: Maps the parameters for a pass to indices in the constant mirror. --------------------------------------------------------------------------------------

//   Maps the parameters for a pass to indices in the constant mirror.
// --------------------------------------------------------------------------------------
void Tr2Effect::MapPassParameters(
	Tr2RenderContextEnum::ShaderType stage,
	Tr2MaterialStageInput& stageInput,
	PassParametersOwner& ppOwner,
	const Tr2EffectStageInput& stageInputDesc,
	const Tr2EffectDescription& descriptionDesc,
	Tr2RenderContext& renderContext )
{
	CCP_STATS_ZONE( __FUNCTION__ );

	static const size_t MAX_PARAMS = 128;

	Tr2EffectParamVector& pv = stageInput.m_shaderParameters;
	auto& constants = stageInputDesc.constants;
	Tr2VariableStore& variableStore = GetVariableStore();

	unsigned int perObjectStart = 0xffffffff;

	CCP_ASSERT( constants.size() < MAX_PARAMS );
	ITr2EffectValue* foundParams[MAX_PARAMS];
	unsigned constantSize = 0;
	unsigned index = 0;
	bool hasConstantParams = false;
	bool hasVariableParams = false;

	size_t constParamCount;
	auto constParams = GetConstParameters( constParamCount );
	uint32_t constIndexes[MAX_PARAMS];

	// First pass: determine the size of the constant buffer
	for( auto constantIx = constants.begin(); constantIx != constants.end(); ++constantIx )
	{
		constIndexes[index] = -1;
		bool foundConstant = false;
		for( size_t i = 0; i < constParamCount; ++i )
		{
			if( constantIx->name == constParams[i].name )
			{
				constIndexes[index] = uint32_t( i );
				foundConstant = true;
				hasConstantParams = true;
				break;
			}
		}
		ITr2EffectValue* paramAsEffectValue = NULL;
		if( !foundConstant )
		{
			// First search in effect parameter list and see if we have a match
			if( ITriEffectParameter* p = FindParameterByName( constantIx->name.c_str() ) )
			{
				paramAsEffectValue = p;
			}
			else if( auto r = GetResourceByName( constantIx->name.c_str() ) )
			{
				paramAsEffectValue = r;
				AddLoddable( r, constantIx->name.c_str() );
				ppOwner.AddUsedResource( r );
			}