- extract MaterialHelper and move all of its members to aiMaterial in /include.

- pull in IOhannes' patch to set the gcc default visibility for all symbols to NO and to mark ASSIMP_API with __attribute__ ((visibility("default"))).
- drop unneeded ASSIMP_API from most internal classes in /code, we just need to keep some exports on Windows to keep AssimpView alive.

git-svn-id: https://assimp.svn.sourceforge.net/svnroot/assimp/trunk@1066 67173fc5-114c-0410-ac8e-9d2fd5bffc1f

code/ACLoader.cpp

@@ -375,7 +375,7 @@ void AC3DImporter::LoadObjectSection(std::vector<Object>& objects)
 // Convert a material from AC3DImporter::Material to aiMaterial
 void AC3DImporter::ConvertMaterial(const Object& object,
 	const Material& matSrc,
-	MaterialHelper& matDest)
+	aiMaterial& matDest)
 {
 	aiString s;
 
@@ -422,7 +422,7 @@ void AC3DImporter::ConvertMaterial(const Object& object,
 // Converts the loaded data to the internal verbose representation
 aiNode* AC3DImporter::ConvertObjectSection(Object& object,
 	std::vector<aiMesh*>& meshes,
-	std::vector<MaterialHelper*>& outMaterials,
+	std::vector<aiMaterial*>& outMaterials,
 	const std::vector<Material>& materials,
 	aiNode* parent)
 {
@@ -463,7 +463,7 @@ aiNode* AC3DImporter::ConvertObjectSection(Object& object,
 			// default material if all objects of the file contain points
 			// and no faces.
 			mesh->mMaterialIndex = 0;
-			outMaterials.push_back(new MaterialHelper());
+			outMaterials.push_back(new aiMaterial());
 			ConvertMaterial(object, materials[0], *outMaterials.back());
 		}
 		else
@@ -548,7 +548,7 @@ aiNode* AC3DImporter::ConvertObjectSection(Object& object,
 				meshes.push_back(mesh);
 
 				mesh->mMaterialIndex = (unsigned int)outMaterials.size();
-				outMaterials.push_back(new MaterialHelper());
+				outMaterials.push_back(new aiMaterial());
 				ConvertMaterial(object, materials[mat], *outMaterials.back());
 
 				// allocate storage for vertices and normals
@@ -811,7 +811,7 @@ void AC3DImporter::InternReadFile( const std::string& pFile,
 	std::vector<aiMesh*> meshes;
 	meshes.reserve(mNumMeshes);
 
-	std::vector<MaterialHelper*> omaterials;
+	std::vector<aiMaterial*> omaterials;
 	materials.reserve(mNumMeshes);
 
 	// generate a dummy root if there are multiple objects on the top layer