source: GTP/trunk/App/Demos/Illum/EnvMap/EnvMap.h @ 1488

/**
  \brief Data type to define fullscreen quad vertices.
*/
struct Vertex
{
        float x, y, z;
        float nx, ny, nz;
        float tu, tv;
};

/**
  \brief Most of application-specific logic is here. 
*/
class EnvMap {

        /// Callback function to evaluate reflectivity integral. See GenerateCosTexture() and eval().
        typedef float (*eval_fn)(float,float);

        IDirect3DDevice9*               pd3dDevice;             ///< THE D3D DEVICE
        ID3DXEffect*            g_pEffect;      ///< THE EFFECT FILE
        CModelViewerCamera*             camera;                 ///< Rotate/zoom camera, always looking to the origin
        HRESULT                                 hr;                             // return codes

        /// \brief Cubemap that stores the environment as seen from the reference point.
        /// \brief See method RenderCubeMap().
        IDirect3DCubeTexture9*  pCubeTexture;                           
        /// \brief Low-resolution (downsampled) cubemap, derived from #pCubeTexture.
        /// \brief See ReduceCubeMapSize().
        IDirect3DCubeTexture9*  pCubeTextureSmall;                      
        /// \brief Low-resolution cubemap that stores preconvolved data for diffuse/specular environment mapping.
        /// \brief See method PreConvolve().
        IDirect3DCubeTexture9*  pCubeTexturePreConvolved;
        /// Helper texture with precomputed geometric factor values
        IDirect3DTexture9*              pCosValuesTexture;
        /// Texture to be displayed on the walls of the cubic room.
        IDirect3DTexture9*              pRoomTexture;

        bool bCubeMapIsValid;   /// indicates that the cube map has to be re-generated
        bool bShininessIsValid; /// indicates that the reflectivity integral has to be re-calculated

        Cube* cube;                             /// Simple cube centralMesh for the room. See EnvMap::DrawEnvObjects().
        float roomSize;                 /// Size of the cubic room.

        Mesh* centralMesh;              /// The diffuse/glossy object to be shaded.
        Mesh* meshes[10];               /// Objects of the environment (fireballs, etc.).
        int meshCount;                  /// Number of objects in the environment.
        D3DXVECTOR3 reference_pos;

public:

        EnvMap() {
                bCubeMapIsValid = true;
                bShininessIsValid = false;
                pCubeTexture = NULL;
                pCubeTextureSmall = NULL;
                pCubeTexturePreConvolved = NULL;
                pCosValuesTexture = NULL;
                centralMesh = NULL;

                roomSize = 2.2;
                reference_pos = D3DXVECTOR3(0,0,0);
        }

        void SetCamera(CModelViewerCamera* camera) { this->camera = camera; }

        void InvalidateCubeMap() { bCubeMapIsValid = false; }
        void InvalidateShininess() { bShininessIsValid = false; }
        void InvalidateResolution();

        D3DXVECTOR3& GetReferencePos() { return reference_pos; } 

        void ChooseMesh(int whichMesh);
        void SetMeshSize(float d) { if (centralMesh != NULL) centralMesh->SetPreferredDiameter(d); }
        void SetMeshPosition(D3DXVECTOR3 pos) { centralMesh->SetMeshPosition(pos); }
        D3DXVECTOR3 GetMeshPosition() { return centralMesh->GetMeshPosition(); }

        void KeyboardProc( UINT nChar, bool bKeyDown, bool bAltDown );

        void DoRendering(D3DXMATRIXA16& mView, D3DXMATRIXA16& mProj);
        void DrawCenterObjects( D3DXMATRIXA16& mView, D3DXMATRIXA16& mProj );
        void DrawEnvObjects( D3DXMATRIXA16& mView, D3DXMATRIXA16& mProj );

        void SetWorldViewProj(D3DXMATRIXA16& mWorld, D3DXMATRIXA16& mView, D3DXMATRIXA16& mProj );
        D3DXMATRIXA16 ScaleAndOffset(float fScale, D3DXVECTOR3 vOffset);
        D3DXMATRIXA16 ScaleAndOffset(D3DXVECTOR3 vScale, D3DXVECTOR3 vOffset);

        void RenderCubeMap(IDirect3DCubeTexture9* pCubeTexture);
        //IDirect3DTexture9* GenerateCosTexture();
        IDirect3DTexture9* GenerateCosTexture( eval_fn evaluator );

        //void GenerateCosTextureIfNotFound();
        void GenerateCosTextureIfNotFound( wchar_t* fileName, eval_fn evaluator );

        void OnFrameRender( IDirect3DDevice9* pd3dDevice, D3DXMATRIXA16& mView, D3DXMATRIXA16& mProj );

        void OnCreateDevice( IDirect3DDevice9* pd3dDevice, ID3DXEffect* g_pEffect );
        void OnDestroyDevice();

        void OnResetDevice();
        void OnLostDevice();

        IDirect3DVertexBuffer9 *pVertexBuffer;
        void InitFullScreenQuad()
        {
                Vertex g_quadVertices[] = {     
                        {-1, 1, 0,  0, 0, 1,  0,0 },
                        { 1, 1, 0,  0, 0, 1,  1,0 },
                        {-1,-1, 0,  0, 0, 1,  0,1 },
                        { 1,-1, 0,  0, 0, 1,  1,1 }
                };

                pd3dDevice->CreateVertexBuffer( sizeof(g_quadVertices), D3DUSAGE_WRITEONLY, 
                                                                                D3DFVF_XYZ | D3DFVF_NORMAL | D3DFVF_TEX1, D3DPOOL_DEFAULT, 
                                                                                &pVertexBuffer, NULL );
                void *pVertices = NULL;

                pVertexBuffer->Lock( 0, sizeof(g_quadVertices), (void**)&pVertices, 0 ); 
                memcpy( pVertices, g_quadVertices, sizeof(g_quadVertices) );
                pVertexBuffer->Unlock();
        }

        void DrawFullScreenQuad()
        {
                // draw a square
                pd3dDevice->SetStreamSource( 0, pVertexBuffer, 0, sizeof(Vertex) );
                pd3dDevice->SetFVF( D3DFVF_XYZ | D3DFVF_NORMAL | D3DFVF_TEX1 );
                pd3dDevice->DrawPrimitive( D3DPT_TRIANGLESTRIP, 0, 2);
        }

        void ReduceCubeMapSize(IDirect3DCubeTexture9* pSourceCube, IDirect3DCubeTexture9* pDestCube);
        void PreConvolve(IDirect3DCubeTexture9* pSourceCube, IDirect3DCubeTexture9* pDestCube);
        //void RenderToCubeTexture(IDirect3DCubeTexture9* pDestCube);
        void SaveCubeMap(IDirect3DCubeTexture9* pCubeTexture, char* FileNamePrefix, char* FileNameSuffix = "");

        IDirect3DCubeTexture9* CreateCubeTexture( int size, D3DFORMAT Format )
        {
                HRESULT hr;
                IDirect3DCubeTexture9* pCubeTexture;

                if( FAILED(hr = D3DXCreateCubeTexture( pd3dDevice, 
                        size, 1,        // mipmap levels = 1
                        D3DUSAGE_RENDERTARGET, 
                        Format,
                        D3DPOOL_DEFAULT,
                        &pCubeTexture )))
                {
                        MessageBox(NULL, L"Cube texture creation failed!", L"Error", MB_OK|MB_TOPMOST);
                        exit(-1);
                }
                return pCubeTexture;
        }
};