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/// \file AMFImporter_Material.cpp
/// \brief Parsing data from material nodes.
/// \date 2016
/// \author smal.root@gmail.com

#ifndef ASSIMP_BUILD_NO_AMF_IMPORTER

#include "AMFImporter.hpp"
#include "AMFImporter_Macro.hpp"

namespace Assimp
{

// <color
// profile="" - The ICC color space used to interpret the three color channels <r>, <g> and <b>.
// >
// </color>
// A color definition.
// Multi elements - No.
// Parent element - <material>, <object>, <volume>, <vertex>, <triangle>.
//
// "profile" can be one of "sRGB", "AdobeRGB", "Wide-Gamut-RGB", "CIERGB", "CIELAB", or "CIEXYZ".
// Children elements:
//   <r>, <g>, <b>, <a>
//   Multi elements - No.
//   Red, Greed, Blue and Alpha (transparency) component of a color in sRGB space, values ranging from 0 to 1. The
//   values can be specified as constants, or as a formula depending on the coordinates.
void AMFImporter::ParseNode_Color()
{
std::string profile;
CAMFImporter_NodeElement* ne;

	// Read attributes for node <color>.
	MACRO_ATTRREAD_LOOPBEG;
		MACRO_ATTRREAD_CHECK_RET("profile", profile, mReader->getAttributeValue);
	MACRO_ATTRREAD_LOOPEND;

	// create new color object.
	ne = new CAMFImporter_NodeElement_Color(mNodeElement_Cur);

	CAMFImporter_NodeElement_Color& als = *((CAMFImporter_NodeElement_Color*)ne);// alias for convenience

	als.Profile = profile;
	// Check for child nodes
	if(!mReader->isEmptyElement())
	{
		bool read_flag[4] = { false, false, false, false };

		ParseHelper_Node_Enter(ne);
		MACRO_NODECHECK_LOOPBEGIN("color");
			MACRO_NODECHECK_READCOMP_F("r", read_flag[0], als.Color.r);
			MACRO_NODECHECK_READCOMP_F("g", read_flag[1], als.Color.g);
			MACRO_NODECHECK_READCOMP_F("b", read_flag[2], als.Color.b);
			MACRO_NODECHECK_READCOMP_F("a", read_flag[3], als.Color.a);
		MACRO_NODECHECK_LOOPEND("color");
		ParseHelper_Node_Exit();
		// check that all components was defined
		if(!(read_flag[0] && read_flag[1] && read_flag[2])) throw DeadlyImportError("Not all color components are defined.");
		// check if <a> is absent. Then manually add "a == 1".
		if(!read_flag[3]) als.Color.a = 1;

	}// if(!mReader->isEmptyElement())
	else
	{
		mNodeElement_Cur->Child.push_back(ne);// Add element to child list of current element
	}// if(!mReader->isEmptyElement()) else

	als.Composed = false;
	mNodeElement_List.push_back(ne);// and to node element list because its a new object in graph.
}

// <material
// id="" - A unique material id. material ID "0" is reserved to denote no material (void) or sacrificial material.
// >
// </material>
// An available material.
// Multi elements - Yes.
// Parent element - <amf>.
void AMFImporter::ParseNode_Material()
{
std::string id;
CAMFImporter_NodeElement* ne;

	// Read attributes for node <color>.
	MACRO_ATTRREAD_LOOPBEG;
		MACRO_ATTRREAD_CHECK_RET("id", id, mReader->getAttributeValue);
	MACRO_ATTRREAD_LOOPEND;

	// create new object.
	ne = new CAMFImporter_NodeElement_Material(mNodeElement_Cur);
	// and assign read data
	((CAMFImporter_NodeElement_Material*)ne)->ID = id;
	// Check for child nodes
	if(!mReader->isEmptyElement())
	{
		bool col_read = false;

		ParseHelper_Node_Enter(ne);
		MACRO_NODECHECK_LOOPBEGIN("material");
			if(XML_CheckNode_NameEqual("color"))
			{
				// Check if data already defined.
				if(col_read) Throw_MoreThanOnceDefined("color", "Only one color can be defined for <material>.");
				// read data and set flag about it
				ParseNode_Color();
				col_read = true;

				continue;
			}

			if(XML_CheckNode_NameEqual("metadata")) { ParseNode_Metadata(); continue; }
		MACRO_NODECHECK_LOOPEND("material");
		ParseHelper_Node_Exit();
	}// if(!mReader->isEmptyElement())
	else
	{
		mNodeElement_Cur->Child.push_back(ne);// Add element to child list of current element
	}// if(!mReader->isEmptyElement()) else

	mNodeElement_List.push_back(ne);// and to node element list because its a new object in graph.
}

// <texture
// id=""     - Assigns a unique texture id for the new texture.
// width=""  - Width (horizontal size, x) of the texture, in pixels.
// height="" - Height (lateral size, y) of the texture, in pixels.
// depth=""  - Depth (vertical size, z) of the texture, in pixels.
// type=""   - Encoding of the data in the texture. Currently allowed values are "grayscale" only. In grayscale mode, each pixel is represented by one byte
//   in the range of 0-255. When the texture is referenced using the tex function, these values are converted into a single floating point number in the
//   range of 0-1 (see Annex 2). A full color graphics will typically require three textures, one for each of the color channels. A graphic involving
//   transparency may require a fourth channel.
// tiled=""  - If true then texture repeated when UV-coordinates is greater than 1.
// >
// </triangle>
// Specifies an texture data to be used as a map. Lists a sequence of Base64 values specifying values for pixels from left to right then top to bottom,
// then layer by layer.
// Multi elements - Yes.
// Parent element - <amf>.
void AMFImporter::ParseNode_Texture()
{
std::string id;
uint32_t width = 0;
uint32_t height = 0;
uint32_t depth = 1;
std::string type;
bool tiled = false;
std::string enc64_data;
CAMFImporter_NodeElement* ne;

	// Read attributes for node <color>.
	MACRO_ATTRREAD_LOOPBEG;
		MACRO_ATTRREAD_CHECK_RET("id", id, mReader->getAttributeValue);
		MACRO_ATTRREAD_CHECK_RET("width", width, XML_ReadNode_GetAttrVal_AsU32);
		MACRO_ATTRREAD_CHECK_RET("height", height, XML_ReadNode_GetAttrVal_AsU32);
		MACRO_ATTRREAD_CHECK_RET("depth", depth, XML_ReadNode_GetAttrVal_AsU32);
		MACRO_ATTRREAD_CHECK_RET("type", type, mReader->getAttributeValue);
		MACRO_ATTRREAD_CHECK_RET("tiled", tiled, XML_ReadNode_GetAttrVal_AsBool);
	MACRO_ATTRREAD_LOOPEND;

	// create new texture object.
	ne = new CAMFImporter_NodeElement_Texture(mNodeElement_Cur);

	CAMFImporter_NodeElement_Texture& als = *((CAMFImporter_NodeElement_Texture*)ne);// alias for convenience

	// Check for child nodes
	if(!mReader->isEmptyElement()) XML_ReadNode_GetVal_AsString(enc64_data);

	// check that all components was defined
	if(id.empty()) throw DeadlyImportError("ID for texture must be defined.");
	if(width < 1) Throw_IncorrectAttrValue("width");
	if(height < 1) Throw_IncorrectAttrValue("height");
	if(depth < 1) Throw_IncorrectAttrValue("depth");
	if(type != "grayscale") Throw_IncorrectAttrValue("type");
	if(enc64_data.empty()) throw DeadlyImportError("Texture data not defined.");
	// copy data
	als.ID = id;
	als.Width = width;
	als.Height = height;
	als.Depth = depth;
	als.Tiled = tiled;
	ParseHelper_Decode_Base64(enc64_data, als.Data);
	// check data size
	if((width * height * depth) != als.Data.size()) throw DeadlyImportError("Texture has incorrect data size.");

	mNodeElement_Cur->Child.push_back(ne);// Add element to child list of current element
	mNodeElement_List.push_back(ne);// and to node element list because its a new object in graph.
}

// <texmap
// rtexid="" - Texture ID for red color component.
// gtexid="" - Texture ID for green color component.
// btexid="" - Texture ID for blue color component.
// atexid="" - Texture ID for alpha color component. Optional.
// >
// </texmap>, old name: <map>
// Specifies texture coordinates for triangle.
// Multi elements - No.
// Parent element - <triangle>.
// Children elements:
//   <utex1>, <utex2>, <utex3>, <vtex1>, <vtex2>, <vtex3>. Old name: <u1>, <u2>, <u3>, <v1>, <v2>, <v3>.
//   Multi elements - No.
//   Texture coordinates for every vertex of triangle.
void AMFImporter::ParseNode_TexMap(const bool pUseOldName)
{
std::string rtexid, gtexid, btexid, atexid;
CAMFImporter_NodeElement* ne;

	// Read attributes for node <color>.
	MACRO_ATTRREAD_LOOPBEG;
		MACRO_ATTRREAD_CHECK_RET("rtexid", rtexid, mReader->getAttributeValue);
		MACRO_ATTRREAD_CHECK_RET("gtexid", gtexid, mReader->getAttributeValue);
		MACRO_ATTRREAD_CHECK_RET("btexid", btexid, mReader->getAttributeValue);
		MACRO_ATTRREAD_CHECK_RET("atexid", atexid, mReader->getAttributeValue);
	MACRO_ATTRREAD_LOOPEND;

	// create new texture coordinates object.
	ne = new CAMFImporter_NodeElement_TexMap(mNodeElement_Cur);

	CAMFImporter_NodeElement_TexMap& als = *((CAMFImporter_NodeElement_TexMap*)ne);// alias for convenience
	// check data
	if(rtexid.empty() && gtexid.empty() && btexid.empty()) throw DeadlyImportError("ParseNode_TexMap. At least one texture ID must be defined.");
	// Check for children nodes
	XML_CheckNode_MustHaveChildren();
	// read children nodes
	bool read_flag[6] = { false, false, false, false, false, false };

	ParseHelper_Node_Enter(ne);
	if(!pUseOldName)
	{
		MACRO_NODECHECK_LOOPBEGIN("texmap");
			MACRO_NODECHECK_READCOMP_F("utex1", read_flag[0], als.TextureCoordinate[0].x);
			MACRO_NODECHECK_READCOMP_F("utex2", read_flag[1], als.TextureCoordinate[1].x);
			MACRO_NODECHECK_READCOMP_F("utex3", read_flag[2], als.TextureCoordinate[2].x);
			MACRO_NODECHECK_READCOMP_F("vtex1", read_flag[3], als.TextureCoordinate[0].y);
			MACRO_NODECHECK_READCOMP_F("vtex2", read_flag[4], als.TextureCoordinate[1].y);
			MACRO_NODECHECK_READCOMP_F("vtex3", read_flag[5], als.TextureCoordinate[2].y);
		MACRO_NODECHECK_LOOPEND("texmap");
	}
	else
	{
		MACRO_NODECHECK_LOOPBEGIN("map");
			MACRO_NODECHECK_READCOMP_F("u1", read_flag[0], als.TextureCoordinate[0].x);
			MACRO_NODECHECK_READCOMP_F("u2", read_flag[1], als.TextureCoordinate[1].x);
			MACRO_NODECHECK_READCOMP_F("u3", read_flag[2], als.TextureCoordinate[2].x);
			MACRO_NODECHECK_READCOMP_F("v1", read_flag[3], als.TextureCoordinate[0].y);
			MACRO_NODECHECK_READCOMP_F("v2", read_flag[4], als.TextureCoordinate[1].y);
			MACRO_NODECHECK_READCOMP_F("v3", read_flag[5], als.TextureCoordinate[2].y);
		MACRO_NODECHECK_LOOPEND("map");
	}// if(!pUseOldName) else

	ParseHelper_Node_Exit();

	// check that all components was defined
	if(!(read_flag[0] && read_flag[1] && read_flag[2] && read_flag[3] && read_flag[4] && read_flag[5]))
		throw DeadlyImportError("Not all texture coordinates are defined.");

	// copy attributes data
	als.TextureID_R = rtexid;
	als.TextureID_G = gtexid;
	als.TextureID_B = btexid;
	als.TextureID_A = atexid;

	mNodeElement_List.push_back(ne);// add to node element list because its a new object in graph.
}

}// namespace Assimp

#endif // !ASSIMP_BUILD_NO_AMF_IMPORTER