Function GetUvScaleFromAnnotation

trinity/Shader/Tr2Effect.cpp:1320–1374

}

std::optional<float> GetUvScaleFromAnnotation( const char* paramName, const Tr2EffectParameterAnnotation& annotation, const Tr2ConstantEffectParameterStructureList& constParams )
{
	if( annotation.type == Tr2EffectParameterAnnotation::FLOAT )
	{
		return { annotation.floatValue };
	}
	else if( annotation.type == Tr2EffectParameterAnnotation::STRING )
	{
		std::string expr( annotation.stringValue );
		for( size_t i = 0; i < expr.length(); ++i )
		{
			auto& c = expr[i];
			if( c == '.' )
			{
				bool isId = false;
				for( size_t j = i; j > 0; --j )
				{
					auto pc = expr[j - 1];
					if( isdigit( pc ) )
					{
						continue;
					}
					if( isalpha( pc ) )
					{
						isId = true;
						break;
					}
					break;
				}
				if( isId )
				{
					c = '_';
				}
			}
		}

		VariableFactoryArguments factoryArgs = { &constParams, false };
		CcpParser::Externals externals;
		externals.variableFactory = { &GetParserVariable, &factoryArgs };
		CcpParser::Program program;
		auto parsed = CcpParser::Parse( expr.c_str(), externals, program );
		if( !parsed )
		{
			if( !factoryArgs.hasInvalidVariable )
			{
				CCP_LOGWARN( "Invalid LodUvScale annotation for effect parameter \"%s\": %s", paramName, ToString( parsed, expr.c_str() ).c_str() );
			}
			return std::nullopt;
		}
		void* buffers[] = { (void*)&constParams[0] };
		std::unique_ptr<uint8_t[]> tempArena( new uint8_t[program.GetTempArenaSize()] );
		return program.Eval( buffers, tempArena.get() );
	}
	return std::nullopt;
}

bool ExtractLodingAnnotations( std::array<float, ITriEffectTextureParameter::UV_SET_MAX_COUNT>& densityScale, const char* name, const Tr2EffectAnnotationMap& effectAnnotations, const Tr2ConstantEffectParameterStructureList& constParams )
{