added axis-aligned bounding box computation and retrieval function

git-svn-id: svn://anubis/misc/wfobj@40 bd8a9e45-a331-0410-811e-c64571078777

WFObj.cc

@@ -72,6 +72,7 @@ static string basePath(const string & str)
 void WFObj::clear()
 {
 	m_data = std::vector< std::vector<std::string> >();
+	m_loadedVertex = false;
 }
 
 int WFObj::filesize(const char * filename)
@@ -304,6 +305,32 @@ GLuint WFObj::render()
 	return list;
 }
 
+void WFObj::updateAABB(const float * const vertex)
+{
+    if (m_loadedVertex)
+    {
+        if (vertex[0] < m_aabb[0])
+            m_aabb[0] = vertex[0];
+        else if (vertex[0] > m_aabb[3])
+            m_aabb[3] = vertex[0];
+        if (vertex[1] < m_aabb[1])
+            m_aabb[1] = vertex[1];
+        else if (vertex[1] > m_aabb[4])
+            m_aabb[4] = vertex[1];
+        if (vertex[2] < m_aabb[2])
+            m_aabb[2] = vertex[2];
+        else if (vertex[2] > m_aabb[5])
+            m_aabb[5] = vertex[2];
+    }
+    else
+    {
+        m_aabb[0] = m_aabb[3] = vertex[0];
+        m_aabb[1] = m_aabb[4] = vertex[1];
+        m_aabb[2] = m_aabb[5] = vertex[2];
+        m_loadedVertex = true;
+    }
+}
+
 WFObj::Vertex WFObj::readVertex(const vector<string> & parts)
 {
 	int partslen = parts.size();

WFObj.hh

@@ -10,8 +10,9 @@ public:
 	typedef GLuint (*loadTextureFunc_t)(const char * texture);
 	bool load(const std::string & filename, loadTextureFunc_t loadTexture);
 	GLuint render();
+	const float * const getAABB() { return m_aabb; }
 
-private:
+protected:
 	/* types */
 	class Vertex
 	{
@@ -29,11 +30,14 @@ private:
 	void processInputLine(const std::string & input);
 	Vertex readVertex(const std::vector<std::string> & parts);
 	void parseVertexIndices(const std::string & vtxref, int * ret);
+	void updateAABB(const float * const vertex);
 
 	/* variables */
 	std::vector< std::vector<std::string> > m_data;
 	loadTextureFunc_t m_loadTexture;
 	std::string m_fileName;
+	float m_aabb[6];
+	bool m_loadedVertex;
 };
 
 
@@ -44,7 +48,7 @@ public:
 	void renderBegin(const std::string & mtlname);
 	void renderEnd(const std::string & mtlname);
 
-private:
+protected:
 	/* methods */
 	void clear();
 	int filesize(const char * filename);