source: trunk/VUT/chcdemo/Geometry.h @ 10

#ifndef NO_PRAGMA_ONCE
#pragma once
#endif

#ifndef GEOMETRY_H
#define GEOMETRY_H

extern "C"
{
        #include "MathStuff.h"
}

/** Represents a drawable geometry. It can draw simple objects (teapot,
        torus, shere. It also contains the object transformation and 
        the material .An AAB is used as bouning volume.
*/
class Geometry
{
public:
        Geometry();
        Geometry(Vector3 translation, float xRot, float yRot, float zRot, float scale, int objectType);
        //! renders this geometry
        void Render();
        
        //! sets rotations in degree : executed in the order x, y, and z rotation
        void SetRotations(float xRot, float yRot, float zRot);
        //! sets the rotation matrix
        void SetTranslation(Vector3 translation);
        //! a uniform scale
        void SetScale(float scale);
        //! returns current scale
        float GetScale();

        //! returns translation
        void GetTranslation(Vector3 translation);
        //! returns rotation
        void GetRotations(float &xRot, float &yRot, float &zRot);

        // --- material settings
        void SetAmbientColor(float ambientR,   float ambientG,  float ambientB);
        void SetDiffuseColor(float diffuseR,   float diffuseG,  float diffuseB);
        void SetSpecularColor(float specularR, float specularG, float specularB);

        const AABox& GetBoundingVolume();
                
        //! last visited flag, important for rendering each geometry only once
        void SetLastVisited(int lastVisited);
        //! returns lastvisited flag
        int GetLastVisited();

        // --- sets the object type to one of teapot, torus, sphere
        void SetObjectType(int type);

        enum{TEAPOT, TORUS, SPHERE, NUM_OBJECTS};
        
        static int sDisplayList[NUM_OBJECTS];
        
        //! cleans static members
        static void CleanUp();
        //! returns the triangle count of the specified object type
        static int CountTriangles(int objectType);
        //! initialises display lists
        static void ResetLists(); 

protected:
        //! generates the display list this a object
        void GenerateList();

        //! calculates accumulated transformation matrix
        void CalcTransform();
        //! applies tranformations
        void Transform();

        // --- statistics
        static int CountTorusTriangles();
        static int CountSphereTriangles();
        static int CountTeapotTriangles();

        //!
        static void CreateTorus(float innerRadius, float outerRadius, int precision);

        //! calculates the bounding volume of this geometry
        void CalcBoundingVolume();
        // the size of the bounging box is calculated using the radius of the sphere
        void CalcSphereBoundingVolume();
        // the standard bounding volume calculation having an array of vertices
        void CalcBoundingVolume(float *vertices, const int num_vertices);

        // initialises static members
        static bool Init();

        // --- drawing routines
        static void RenderTeapot();
        static void RenderSphere();
        static void RenderTorus();

        // --- transformations
        float mXRotation;
        float mYRotation;
        float mZRotation;
        
        float mScale;

        Vector3 mTranslation;
        
        //! accumulated transform matrix 
        Matrix4x4 mTransform;

        // --- material
        float mAmbientColor[3];
        float mDiffuseColor[3];
        float mSpecularColor[3];

        AABox mBoundingBox;
        //! type of the rendered object (teapot, sphere ...)
        int mObjectType;
        
        int mLastVisited;

        // --- static members

        static bool sIsInitialised;

        static float const sphere_radius;
        
        static int num_torus_indices;
        static int num_torus_vertices;
        static int num_torus_normals;

        static float *torus_vertices;
        static float *torus_normals;
        static int *torus_indices;

        static const int torus_precision;
        static const int sphere_precision;
        static const float torus_inner_radius;
        static const float torus_outer_radius;
};


#endif // GEOMETRY_H