IRRShared.cpp

/*
---------------------------------------------------------------------------
Open Asset Import Library (ASSIMP)
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Copyright (c) 2006-2008, ASSIMP Development Team

All rights reserved.

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* Redistributions of source code must retain the above
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  following disclaimer.

* Redistributions in binary form must reproduce the above
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  derived from this software without specific prior
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*/

/** @file  IRRShared.cpp
 *  @brief Shared utilities for the IRR and IRRMESH loaders
 */

#include "AssimpPCH.h"

#include "IRRShared.h"
#include "ParsingUtils.h"
#include "fast_atof.h"

using namespace Assimp;
using namespace irr;
using namespace irr::io;

// Transformation matrix to convert from Assimp to IRR space
const aiMatrix4x4 Assimp::AI_TO_IRR_MATRIX = aiMatrix4x4 ( 
	1.0f, 0.0f, 0.0f, 0.0f, 
	0.0f, 0.0f, 1.0f, 0.0f,
	0.0f, 1.0f, 0.0f, 0.0f, 
	0.0f, 0.0f, 0.0f, 1.0f);

// ------------------------------------------------------------------------------------------------
// read a property in hexadecimal format (i.e. ffffffff)
void IrrlichtBase::ReadHexProperty    (HexProperty&    out)
{
	for (int i = 0; i < reader->getAttributeCount();++i)
	{
		if (!ASSIMP_stricmp(reader->getAttributeName(i),"name"))
		{
			out.name = std::string( reader->getAttributeValue(i) );
		}
		else if (!ASSIMP_stricmp(reader->getAttributeName(i),"value"))
		{
			// parse the hexadecimal value
			out.value = strtol16(reader->getAttributeValue(i));
		}
	}
}

// ------------------------------------------------------------------------------------------------
// read a decimal property
void IrrlichtBase::ReadIntProperty    (IntProperty&    out)
{
	for (int i = 0; i < reader->getAttributeCount();++i)
	{
		if (!ASSIMP_stricmp(reader->getAttributeName(i),"name"))
		{
			out.name = std::string( reader->getAttributeValue(i) );
		}
		else if (!ASSIMP_stricmp(reader->getAttributeName(i),"value"))
		{
			// parse the ecimal value
			out.value = strtol10s(reader->getAttributeValue(i));
		}
	}
}

// ------------------------------------------------------------------------------------------------
// read a string property
void IrrlichtBase::ReadStringProperty (StringProperty& out)
{
	for (int i = 0; i < reader->getAttributeCount();++i)
	{
		if (!ASSIMP_stricmp(reader->getAttributeName(i),"name"))
		{
			out.name = std::string( reader->getAttributeValue(i) );
		}
		else if (!ASSIMP_stricmp(reader->getAttributeName(i),"value"))
		{
			// simple copy the string
			out.value = std::string (reader->getAttributeValue(i));
		}
	}
}

// ------------------------------------------------------------------------------------------------
// read a boolean property
void IrrlichtBase::ReadBoolProperty   (BoolProperty&   out)
{
	for (int i = 0; i < reader->getAttributeCount();++i)
	{
		if (!ASSIMP_stricmp(reader->getAttributeName(i),"name"))
		{
			out.name = std::string( reader->getAttributeValue(i) );
		}
		else if (!ASSIMP_stricmp(reader->getAttributeName(i),"value"))
		{
			// true or false, case insensitive
			out.value = (ASSIMP_stricmp( reader->getAttributeValue(i), 
				"true") ? false : true);
		}
	}
}

// ------------------------------------------------------------------------------------------------
// read a float property
void IrrlichtBase::ReadFloatProperty  (FloatProperty&  out)
{
	for (int i = 0; i < reader->getAttributeCount();++i)
	{
		if (!ASSIMP_stricmp(reader->getAttributeName(i),"name"))
		{
			out.name = std::string( reader->getAttributeValue(i) );
		}
		else if (!ASSIMP_stricmp(reader->getAttributeName(i),"value"))
		{
			// just parse the float
			out.value = fast_atof( reader->getAttributeValue(i) );
		}
	}
}

// ------------------------------------------------------------------------------------------------
// read a vector property
void IrrlichtBase::ReadVectorProperty  (VectorProperty&  out)
{
	for (int i = 0; i < reader->getAttributeCount();++i)
	{
		if (!ASSIMP_stricmp(reader->getAttributeName(i),"name"))
		{
			out.name = std::string( reader->getAttributeValue(i) );
		}
		else if (!ASSIMP_stricmp(reader->getAttributeName(i),"value"))
		{
			// three floats, separated with commas
			const char* ptr = reader->getAttributeValue(i);

			SkipSpaces(&ptr);
			ptr = fast_atof_move( ptr,(float&)out.value.x );
			SkipSpaces(&ptr);
			if (',' != *ptr)
			{
				DefaultLogger::get()->error("IRR(MESH): Expected comma in vector definition");
			}
			else SkipSpaces(ptr+1,&ptr);
			ptr = fast_atof_move( ptr,(float&)out.value.y );
			SkipSpaces(&ptr);
			if (',' != *ptr)
			{
				DefaultLogger::get()->error("IRR(MESH): Expected comma in vector definition");
			}
			else SkipSpaces(ptr+1,&ptr);
			ptr = fast_atof_move( ptr,(float&)out.value.z );
		}
	}
}

// ------------------------------------------------------------------------------------------------
// Convert a string to a proper aiMappingMode
int ConvertMappingMode(const std::string& mode)
{
	if (mode == "texture_clamp_repeat")
	{
		return aiTextureMapMode_Wrap;
	}
	else if (mode == "texture_clamp_mirror")
		return aiTextureMapMode_Mirror;

	return aiTextureMapMode_Clamp;
}

// ------------------------------------------------------------------------------------------------
// Parse a material from the XML file
aiMaterial* IrrlichtBase::ParseMaterial(unsigned int& matFlags)
{
	MaterialHelper* mat = new MaterialHelper();
	aiColor4D clr;
	aiString s;

	matFlags = 0; // zero output flags
	int cnt  = 0; // number of used texture channels
	unsigned int nd = 0;

	// Continue reading from the file
	while (reader->read())
	{
		switch (reader->getNodeType())
		{
		case EXN_ELEMENT:

			// Hex properties
			if (!ASSIMP_stricmp(reader->getNodeName(),"color"))
			{
				HexProperty prop;
				ReadHexProperty(prop);
				if (prop.name == "Diffuse")
				{
					ColorFromARGBPacked(prop.value,clr);
					mat->AddProperty(&clr,1,AI_MATKEY_COLOR_DIFFUSE);
				}
				else if (prop.name == "Ambient")
				{
					ColorFromARGBPacked(prop.value,clr);
					mat->AddProperty(&clr,1,AI_MATKEY_COLOR_AMBIENT);
				}
				else if (prop.name == "Specular")
				{
					ColorFromARGBPacked(prop.value,clr);
					mat->AddProperty(&clr,1,AI_MATKEY_COLOR_SPECULAR);
				}

				// NOTE: The 'emissive' property causes problems. It is
				// often != 0, even if there is obviously no light
				// emitted by the described surface. In fact I think
				// IRRLICHT ignores this property, too.
#if 0
				else if (prop.name == "Emissive")
				{
					ColorFromARGBPacked(prop.value,clr);
					mat->AddProperty(&clr,1,AI_MATKEY_COLOR_EMISSIVE);
				}
#endif
			}
			// Float properties
			else if (!ASSIMP_stricmp(reader->getNodeName(),"float"))
			{
				FloatProperty prop;
				ReadFloatProperty(prop);
				if (prop.name == "Shininess")
				{
					mat->AddProperty(&prop.value,1,AI_MATKEY_SHININESS);
				}
			}
			// Bool properties
			else if (!ASSIMP_stricmp(reader->getNodeName(),"bool"))
			{
				BoolProperty prop;
				ReadBoolProperty(prop);
				if (prop.name == "Wireframe")
				{
					int val = (prop.value ? true : false);
					mat->AddProperty(&val,1,AI_MATKEY_ENABLE_WIREFRAME);
				}
				else if (prop.name == "GouraudShading")
				{
					int val = (prop.value ? aiShadingMode_Gouraud 
						: aiShadingMode_NoShading);
					mat->AddProperty(&val,1,AI_MATKEY_SHADING_MODEL);
				}
				else if (prop.name == "BackfaceCulling")
				{
					int val = (!prop.value);
					mat->AddProperty(&val,1,AI_MATKEY_TWOSIDED);
				}
			}
			// String properties - textures and texture related properties
			else if (!ASSIMP_stricmp(reader->getNodeName(),"texture") ||
				     !ASSIMP_stricmp(reader->getNodeName(),"enum"))
			{
				StringProperty prop;
				ReadStringProperty(prop);
				if (prop.value.length())
				{
					// material type (shader)
					if (prop.name == "Type")
					{
						if (prop.value == "solid")
						{
							// default material ...
						}
						else if (prop.value == "trans_vertex_alpha")
						{
							matFlags = AI_IRRMESH_MAT_trans_vertex_alpha;
						}
						else if (prop.value == "lightmap")
						{
							matFlags = AI_IRRMESH_MAT_lightmap;
						}
						else if (prop.value == "solid_2layer")
						{
							matFlags = AI_IRRMESH_MAT_solid_2layer;
						}
						else if (prop.value == "lightmap_m2")
						{
							matFlags = AI_IRRMESH_MAT_lightmap_m2;
						}
						else if (prop.value == "lightmap_m4")
						{
							matFlags = AI_IRRMESH_MAT_lightmap_m4;
						}
						else if (prop.value == "lightmap_light")
						{
							matFlags = AI_IRRMESH_MAT_lightmap_light;
						}
						else if (prop.value == "lightmap_light_m2")
						{
							matFlags = AI_IRRMESH_MAT_lightmap_light_m2;
						}
						else if (prop.value == "lightmap_light_m4")
						{
							matFlags = AI_IRRMESH_MAT_lightmap_light_m4;
						}
						else if (prop.value == "lightmap_add")
						{
							matFlags = AI_IRRMESH_MAT_lightmap_add;
						}
						// Normal and parallax maps are treated equally
						else if (prop.value == "normalmap_solid" ||
							prop.value == "parallaxmap_solid")
						{
							matFlags = AI_IRRMESH_MAT_normalmap_solid;
						}
						else if (prop.value == "normalmap_trans_vertex_alpha" ||
							prop.value == "parallaxmap_trans_vertex_alpha")
						{
							matFlags = AI_IRRMESH_MAT_normalmap_tva;
						}
						else if (prop.value == "normalmap_trans_add" ||
							prop.value == "parallaxmap_trans_add")
						{
							matFlags = AI_IRRMESH_MAT_normalmap_ta;
						}
						else {
							DefaultLogger::get()->warn("IRRMat: Unrecognized material type: " + prop.value);
						}
					}

					// Up to 4 texture channels are supported
					if (prop.name == "Texture1")
					{
						// Always accept the primary texture channel
						++cnt;
						s.Set(prop.value);
						mat->AddProperty(&s,AI_MATKEY_TEXTURE_DIFFUSE(0));
					}
					else if (prop.name == "Texture2" && cnt == 1)
					{
						// 2-layer material lightmapped?
						if (matFlags & AI_IRRMESH_MAT_lightmap)	{
							++cnt;
							s.Set(prop.value);
							mat->AddProperty(&s,AI_MATKEY_TEXTURE_LIGHTMAP(0));

							// set the corresponding material flag
							matFlags |= AI_IRRMESH_EXTRA_2ND_TEXTURE;
						}
						// alternatively: normal or parallax mapping
						else if (matFlags & AI_IRRMESH_MAT_normalmap_solid)	{
							++cnt;
							s.Set(prop.value);
							mat->AddProperty(&s,AI_MATKEY_TEXTURE_NORMALS(0));

							// set the corresponding material flag
							matFlags |= AI_IRRMESH_EXTRA_2ND_TEXTURE;
						}
						// or just as second diffuse texture
						else if (matFlags & AI_IRRMESH_MAT_solid_2layer)	{
							++cnt;
							s.Set(prop.value);
							mat->AddProperty(&s,AI_MATKEY_TEXTURE_DIFFUSE(1));
							++nd;

							// set the corresponding material flag
							matFlags |= AI_IRRMESH_EXTRA_2ND_TEXTURE;
						}
						else DefaultLogger::get()->warn("IRRmat: Skipping second texture");
					}

					else if (prop.name == "Texture3" && cnt == 2)
					{
						// Irrlicht does not seem to use these channels.
						++cnt;
						s.Set(prop.value);
						mat->AddProperty(&s,AI_MATKEY_TEXTURE_DIFFUSE(nd+1));
					}
					else if (prop.name == "Texture4" && cnt == 3)
					{
						// Irrlicht does not seem to use these channels.
						++cnt;
						s.Set(prop.value);
						mat->AddProperty(&s,AI_MATKEY_TEXTURE_DIFFUSE(nd+2));
					}

					// Texture mapping options
					if (prop.name == "TextureWrap1" && cnt >= 1)
					{
						int map = ConvertMappingMode(prop.value);
						mat->AddProperty(&map,1,AI_MATKEY_MAPPINGMODE_U_DIFFUSE(0));
						mat->AddProperty(&map,1,AI_MATKEY_MAPPINGMODE_V_DIFFUSE(0));
					}
					else if (prop.name == "TextureWrap2" && cnt >= 2)
					{
						int map = ConvertMappingMode(prop.value);
						if (matFlags & AI_IRRMESH_MAT_lightmap) {
							mat->AddProperty(&map,1,AI_MATKEY_MAPPINGMODE_U_LIGHTMAP(0));
							mat->AddProperty(&map,1,AI_MATKEY_MAPPINGMODE_V_LIGHTMAP(0));	
						}
						else if (matFlags & (AI_IRRMESH_MAT_normalmap_solid)) {
							mat->AddProperty(&map,1,AI_MATKEY_MAPPINGMODE_U_NORMALS(0));
							mat->AddProperty(&map,1,AI_MATKEY_MAPPINGMODE_V_NORMALS(0));	
						}
						else if (matFlags & AI_IRRMESH_MAT_solid_2layer) {
							mat->AddProperty(&map,1,AI_MATKEY_MAPPINGMODE_U_DIFFUSE(1));
							mat->AddProperty(&map,1,AI_MATKEY_MAPPINGMODE_V_DIFFUSE(1));	
						}
					}
					else if (prop.name == "TextureWrap3" && cnt >= 3)
					{
						int map = ConvertMappingMode(prop.value);
						mat->AddProperty(&map,1,AI_MATKEY_MAPPINGMODE_U_DIFFUSE(nd+1));
						mat->AddProperty(&map,1,AI_MATKEY_MAPPINGMODE_V_DIFFUSE(nd+1));
					}
					else if (prop.name == "TextureWrap4" && cnt >= 4)
					{
						int map = ConvertMappingMode(prop.value);
						mat->AddProperty(&map,1,AI_MATKEY_MAPPINGMODE_U_DIFFUSE(nd+2));
						mat->AddProperty(&map,1,AI_MATKEY_MAPPINGMODE_V_DIFFUSE(nd+2));
					}
				}
			}
			break;
			case EXN_ELEMENT_END:

				/* Assume there are no further nested nodes in <material> elements
				 */
				if (/* IRRMESH */ !ASSIMP_stricmp(reader->getNodeName(),"material") ||
					/* IRR     */ !ASSIMP_stricmp(reader->getNodeName(),"attributes"))
				{
					// Now process lightmapping flags
					// We should have at least one textur to do that ..
					if (cnt && matFlags & AI_IRRMESH_MAT_lightmap)
					{
						float f = 1.f;
						unsigned int unmasked = matFlags&~AI_IRRMESH_MAT_lightmap;

						// Additive lightmap?
						int op = (unmasked & AI_IRRMESH_MAT_lightmap_add
							? aiTextureOp_Add : aiTextureOp_Multiply);

						// Handle Irrlicht's lightmapping scaling factor
						if (unmasked & AI_IRRMESH_MAT_lightmap_m2 ||
							unmasked & AI_IRRMESH_MAT_lightmap_light_m2)
						{
							f = 2.f;
						}
						else if (unmasked & AI_IRRMESH_MAT_lightmap_m4 ||
							unmasked & AI_IRRMESH_MAT_lightmap_light_m4)
						{
							f = 4.f;
						}
						mat->AddProperty( &f, 1, AI_MATKEY_TEXBLEND_LIGHTMAP(0));
						mat->AddProperty( &op,1, AI_MATKEY_TEXOP_LIGHTMAP(0));
					}

					return mat;
				}
			default:

				// GCC complains here ...
				break;
		}
	}
	DefaultLogger::get()->error("IRRMESH: Unexpected end of file. Material is not complete");
	return mat;
}