//-----------------------------------------------------------------------------
// File: DotProduct3.cpp
//
// Desc: D3D sample showing how to do bumpmapping using the DotProduct3 
//       texture operation.
// 
// Copyright (c) 1998-2000 Microsoft Corporation. All rights reserved.
//-----------------------------------------------------------------------------
#define STRICT
#include <tchar.h>
#include <math.h>
#include <stdio.h>
#include <D3DX8.h>
#include "D3DApp.h"
#include "D3DFont.h"
#include "D3DUtil.h"
#include "DXUtil.h"
#include "resource.h"




//-----------------------------------------------------------------------------
// Name: 
// Desc: 
//-----------------------------------------------------------------------------
struct CUSTOMVERTEX
{
    D3DXVECTOR3 v;
    DWORD       diffuse;
    DWORD       specular;
    FLOAT       tu, tv;
};

#define CUSTOMVERTEX_FVF (D3DFVF_XYZ|D3DFVF_DIFFUSE|D3DFVF_SPECULAR|D3DFVF_TEX1)




//-----------------------------------------------------------------------------
// Name: class CMyD3DApplication
// Desc: Application class. The base class (CD3DApplication) provides the 
//       generic functionality needed in all Direct3D samples. CMyD3DApplication 
//       adds functionality specific to this sample program.
//-----------------------------------------------------------------------------
class CMyD3DApplication : public CD3DApplication
{
    CD3DFont*          m_pFont;
    CUSTOMVERTEX       m_QuadVertices[4];
    LPDIRECT3DTEXTURE8 m_pCustomNormalMap;
    LPDIRECT3DTEXTURE8 m_pFileBasedNormalMap;
    D3DXVECTOR3        m_vLight;

    BOOL               m_bUseFileBasedTexture;
    BOOL               m_bShowNormalMap;

    HRESULT CreateFileBasedNormalMap();
    HRESULT CreateCustomNormalMap();
    HRESULT ConfirmDevice( D3DCAPS8*, DWORD, D3DFORMAT );
    LRESULT MsgProc( HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam );

protected:
    HRESULT OneTimeSceneInit();
    HRESULT InitDeviceObjects();
    HRESULT RestoreDeviceObjects();
    HRESULT InvalidateDeviceObjects();
    HRESULT DeleteDeviceObjects();
    HRESULT Render();
    HRESULT FrameMove();
    HRESULT FinalCleanup();

public:
    CMyD3DApplication();
};




//-----------------------------------------------------------------------------
// Name: WinMain()
// Desc: Entry point to the program. Initializes everything, and goes into a
//       message-processing loop. Idle time is used to render the scene.
//-----------------------------------------------------------------------------
INT WINAPI WinMain( HINSTANCE hInst, HINSTANCE, LPSTR, INT )
{
    CMyD3DApplication d3dApp;

    if( FAILED( d3dApp.Create( hInst ) ) )
        return 0;

    return d3dApp.Run();
}




//-----------------------------------------------------------------------------
// Name: VectortoRGBA()
// Desc: Turns a normalized vector into RGBA form. Used to encode vectors into
//       a height map. 
//-----------------------------------------------------------------------------
DWORD VectortoRGBA( D3DXVECTOR3* v, FLOAT fHeight )
{
    DWORD r = (DWORD)( 127.0f * v->x + 128.0f );
    DWORD g = (DWORD)( 127.0f * v->y + 128.0f );
    DWORD b = (DWORD)( 127.0f * v->z + 128.0f );
    DWORD a = (DWORD)( 255.0f * fHeight );
    
    return( (a<<24L) + (r<<16L) + (g<<8L) + (b<<0L) );
}




//-----------------------------------------------------------------------------
// Name: InitVertex()
// Desc: Initializes a vertex
//-----------------------------------------------------------------------------
VOID InitVertex( CUSTOMVERTEX* vtx, FLOAT x, FLOAT y, FLOAT z, FLOAT tu, FLOAT tv )
{
    D3DXVECTOR3 v(1,1,1);
    D3DXVec3Normalize( &v, &v );
    vtx[0].v        = D3DXVECTOR3( x, y, z );
    vtx[0].diffuse  = VectortoRGBA( &v, 1.0f );
    vtx[0].specular = 0x40400000;
    vtx[0].tu       = tu;
    vtx[0].tv       = tv;
}
    



//-----------------------------------------------------------------------------
// Name: CMyD3DApplication()
// Desc: Application constructor. Sets attributes for the app.
//-----------------------------------------------------------------------------
CMyD3DApplication::CMyD3DApplication()
{
    m_strWindowTitle  = _T("DotProduct3: BumpMapping Technique");
    m_bUseDepthBuffer = FALSE;

    m_pFont                = new CD3DFont( _T("Arial"), 12, D3DFONT_BOLD );

    m_bUseFileBasedTexture = FALSE;
    m_bShowNormalMap       = FALSE;

    m_pCustomNormalMap     = NULL;
    m_pFileBasedNormalMap  = NULL;
}




//-----------------------------------------------------------------------------
// Name: OneTimeSceneInit()
// Desc: Called during initial app startup, this function performs all the
//       permanent initialization.
//-----------------------------------------------------------------------------
HRESULT CMyD3DApplication::OneTimeSceneInit()
{
    InitVertex( &m_QuadVertices[0],-1.0f,-1.0f,-1.0f, 0.0f, 0.0f );
    InitVertex( &m_QuadVertices[1], 1.0f,-1.0f,-1.0f, 1.0f, 0.0f );
    InitVertex( &m_QuadVertices[2],-1.0f, 1.0f,-1.0f, 0.0f, 1.0f );
    InitVertex( &m_QuadVertices[3], 1.0f, 1.0f,-1.0f, 1.0f, 1.0f );

    m_vLight = D3DXVECTOR3( 0.0f, 0.0f, 1.0f );

    return S_OK;
}




//-----------------------------------------------------------------------------
// Name: FrameMove()
// Desc: Called once per frame, the call is the entry point for animating
//       the scene.
//-----------------------------------------------------------------------------
HRESULT CMyD3DApplication::FrameMove()
{
    // Compute the light vector from the cursor position
    if( GetFocus() )
    {
        POINT pt;
        GetCursorPos( &pt );
        ScreenToClient( m_hWnd, &pt );

        m_vLight.x = -( ( ( 2.0f * pt.x ) / m_d3dsdBackBuffer.Width ) - 1 );
        m_vLight.y = -( ( ( 2.0f * pt.y ) / m_d3dsdBackBuffer.Height ) - 1 );
        m_vLight.z = 0.0f;

        if( D3DXVec3Length( &m_vLight ) > 1.0f )
            D3DXVec3Normalize( &m_vLight, &m_vLight );
        else
            m_vLight.z = sqrtf( 1.0f - m_vLight.x*m_vLight.x
                                     - m_vLight.y*m_vLight.y );
    }

    return S_OK;
}




//-----------------------------------------------------------------------------
// Name: Render()
// Desc: Called once per frame, the call is the entry point for 3d
//       rendering. This function sets up render states, clears the
//       viewport, and renders the scene.
//-----------------------------------------------------------------------------
HRESULT CMyD3DApplication::Render()
{
    // Clear the render target
    m_pd3dDevice->Clear( 0L, NULL, D3DCLEAR_TARGET, 0x00000000f, 1.0f, 0L );

    // Begin the scene
    if( SUCCEEDED( m_pd3dDevice->BeginScene() ) )
    {
        // Store the light vector, so it can be referenced in D3DTA_TFACTOR
        DWORD dwFactor = VectortoRGBA( &m_vLight, 0.0f );
        m_pd3dDevice->SetRenderState( D3DRS_TEXTUREFACTOR, dwFactor );

        // Modulate the texture (the normal map) with the light vector (stored
        // above in the texture factor)
        m_pd3dDevice->SetTextureStageState( 0, D3DTSS_COLORARG1, D3DTA_TEXTURE );
        m_pd3dDevice->SetTextureStageState( 0, D3DTSS_COLOROP,   D3DTOP_DOTPRODUCT3 );
        m_pd3dDevice->SetTextureStageState( 0, D3DTSS_COLORARG2, D3DTA_TFACTOR );

        // If user wants to see the normal map, override the above renderstates and
        // simply show the texture
        if( TRUE == m_bShowNormalMap )
            m_pd3dDevice->SetTextureStageState( 0, D3DTSS_COLOROP, D3DTOP_SELECTARG1 );

        // Select which normal map to use
        if( m_bUseFileBasedTexture )
            m_pd3dDevice->SetTexture( 0, m_pFileBasedNormalMap );
        else
            m_pd3dDevice->SetTexture( 0, m_pCustomNormalMap );

        // Draw the bumpmapped quad
        m_pd3dDevice->SetVertexShader( CUSTOMVERTEX_FVF );
        m_pd3dDevice->DrawPrimitiveUP( D3DPT_TRIANGLESTRIP, 2, m_QuadVertices, 
                                       sizeof(CUSTOMVERTEX) );

        // Output statistics
        m_pFont->DrawText( 2,  0, D3DCOLOR_ARGB(255,255,255,0), m_strFrameStats );
        m_pFont->DrawText( 2, 20, D3DCOLOR_ARGB(255,255,255,0), m_strDeviceStats );

        // End the scene.
        m_pd3dDevice->EndScene();
    }

    return S_OK;
}





//-----------------------------------------------------------------------------
// Name: 
// Desc: 
//-----------------------------------------------------------------------------
HRESULT CMyD3DApplication::CreateFileBasedNormalMap()
{
    HRESULT hr;

    // Load the texture from a file
    if( FAILED( hr = D3DUtil_CreateTexture( m_pd3dDevice, _T("EarthBump.bmp"), 
                                            &m_pFileBasedNormalMap, 
                                            D3DFMT_A8R8G8B8 ) ) )
        return D3DAPPERR_MEDIANOTFOUND;

    // Lock the texture
    D3DLOCKED_RECT  d3dlr;
    D3DSURFACE_DESC d3dsd;
    m_pFileBasedNormalMap->GetLevelDesc( 0, &d3dsd );
    m_pFileBasedNormalMap->LockRect( 0, &d3dlr, 0, 0 );
    DWORD* pPixel = (DWORD*)d3dlr.pBits;

    // For each pixel, generate a vector normal that represents the change
    // in thea height field at that pixel
    for( DWORD j=0; j<d3dsd.Height; j++  )
    {
        for( DWORD i=0; i<d3dsd.Width; i++ )
        {
            DWORD color00 = pPixel[0];
            DWORD color10 = pPixel[1];
            DWORD color01 = pPixel[d3dlr.Pitch/sizeof(DWORD)];

            FLOAT fHeight00 = (FLOAT)((color00&0x00ff0000)>>16)/255.0f;
            FLOAT fHeight10 = (FLOAT)((color10&0x00ff0000)>>16)/255.0f;
            FLOAT fHeight01 = (FLOAT)((color01&0x00ff0000)>>16)/255.0f;

            D3DXVECTOR3 vPoint00( i+0.0f, j+0.0f, fHeight00 );
            D3DXVECTOR3 vPoint10( i+1.0f, j+0.0f, fHeight10 );
            D3DXVECTOR3 vPoint01( i+0.0f, j+1.0f, fHeight01 );
            D3DXVECTOR3 v10 = vPoint10 - vPoint00;
            D3DXVECTOR3 v01 = vPoint01 - vPoint00;

            D3DXVECTOR3 vNormal;
            D3DXVec3Cross( &vNormal, &v10, &v01 );
            D3DXVec3Normalize( &vNormal, &vNormal );

            // Store the normal as an RGBA value in the normal map
            *pPixel++ = VectortoRGBA( &vNormal, fHeight00 );
        }
    }

    // Unlock the texture and return successful
    m_pFileBasedNormalMap->UnlockRect(0);

    return S_OK;
}




//-----------------------------------------------------------------------------
// Name: 
// Desc: 
//-----------------------------------------------------------------------------
HRESULT CMyD3DApplication::CreateCustomNormalMap()
{
    DWORD   dwWidth  = 512;
    DWORD   dwHeight = 512;
    HRESULT hr;

    // Create a 32-bit texture for the custom normal map
    hr = m_pd3dDevice->CreateTexture( dwWidth, dwHeight, 1, 
                                      0 /* Usage */, 
                                      D3DFMT_A8R8G8B8, D3DPOOL_MANAGED, 
                                      &m_pCustomNormalMap );
    if( FAILED(hr) )
        return hr;

    // Lock the texture to fill it with our custom image
    D3DLOCKED_RECT d3dlr;
    if( FAILED( m_pCustomNormalMap->LockRect( 0, &d3dlr, 0, 0 ) ) )
        return E_FAIL;
    DWORD* pPixel = (DWORD*)d3dlr.pBits;

    // Fill each pixel
    for( DWORD j=0; j<dwHeight; j++  )
    {
        for( DWORD i=0; i<dwWidth; i++ )
        {
            FLOAT xp = ( (5.0f*i) / (dwWidth-1)  );
            FLOAT yp = ( (5.0f*j) / (dwHeight-1) );
            FLOAT x  = 2*(xp-floorf(xp))-1;
            FLOAT y  = 2*(yp-floorf(yp))-1;
            FLOAT z  = sqrtf( 1.0f - x*x - y*y );

            // Make image of raised circle. Outside of circle is gray
            if( (x*x + y*y) <= 1.0f )
            {
                D3DXVECTOR3 vVector( x, y, z );
                *pPixel++ = VectortoRGBA( &vVector, 1.0f );
            }
            else
                *pPixel++ = 0x80808080;
        }
    }

    // Unlock the map and return successful
    m_pCustomNormalMap->UnlockRect(0);

    return S_OK;
}




//-----------------------------------------------------------------------------
// Name: InitDeviceObjects()
// Desc: Initialize scene objects.
//-----------------------------------------------------------------------------
HRESULT CMyD3DApplication::InitDeviceObjects()
{
    HRESULT hr;

    m_pFont->InitDeviceObjects( m_pd3dDevice );

    // Create the normal maps
    if( FAILED( hr = CreateFileBasedNormalMap() ) )
        return hr;
    if( FAILED( hr = CreateCustomNormalMap() ) )
        return hr;

    // Set menu states
    CheckMenuItem( GetMenu(m_hWnd), IDM_USEFILEBASEDTEXTURE,
                   m_bUseFileBasedTexture ? MF_CHECKED : MF_UNCHECKED );
    CheckMenuItem( GetMenu(m_hWnd), IDM_USECUSTOMTEXTURE,
                   m_bUseFileBasedTexture ? MF_UNCHECKED : MF_CHECKED );
    CheckMenuItem( GetMenu(m_hWnd), IDM_SHOWNORMALMAP,    
                   m_bShowNormalMap ? MF_CHECKED : MF_UNCHECKED );

    return S_OK;
}




//-----------------------------------------------------------------------------
// Name: RestoreDeviceObjects()
// Desc: Initialize scene objects.
//-----------------------------------------------------------------------------
HRESULT CMyD3DApplication::RestoreDeviceObjects()
{
    m_pFont->RestoreDeviceObjects();

    // Set the transform matrices
    D3DXVECTOR3 vEyePt    = D3DXVECTOR3( 0.0f, 0.0f, 2.0f );
    D3DXVECTOR3 vLookatPt = D3DXVECTOR3( 0.0f, 0.0f, 0.0f );
    D3DXVECTOR3 vUpVec    = D3DXVECTOR3( 0.0f, 1.0f, 0.0f );
    D3DXMATRIX  matWorld, matView, matProj;
    
    D3DXMatrixIdentity( &matWorld );
    D3DXMatrixLookAtLH( &matView, &vEyePt, &vLookatPt, &vUpVec );
    FLOAT fAspect = m_d3dsdBackBuffer.Width / (FLOAT)m_d3dsdBackBuffer.Height;
    D3DXMatrixPerspectiveFovLH( &matProj, D3DX_PI/4, fAspect, 1.0f, 500.0f );
    
    m_pd3dDevice->SetTransform( D3DTS_WORLD,      &matWorld );
    m_pd3dDevice->SetTransform( D3DTS_VIEW,       &matView );
    m_pd3dDevice->SetTransform( D3DTS_PROJECTION, &matProj );
    
    // Set misc render states
    m_pd3dDevice->SetTextureStageState( 0, D3DTSS_MINFILTER, D3DTEXF_LINEAR );
    m_pd3dDevice->SetTextureStageState( 0, D3DTSS_MAGFILTER, D3DTEXF_LINEAR );
    m_pd3dDevice->SetRenderState( D3DRS_LIGHTING, FALSE );

    return S_OK;
}




//-----------------------------------------------------------------------------
// Name: InvalidateDeviceObjects()
// Desc: Called when the app is exiting, or the device is being changed,
//       this function deletes any device dependent objects.
//-----------------------------------------------------------------------------
HRESULT CMyD3DApplication::InvalidateDeviceObjects()
{
    m_pFont->InvalidateDeviceObjects();
    return S_OK;
}




//-----------------------------------------------------------------------------
// Name: DeleteDeviceObjects()
// Desc: Called when the app is exiting, or the device is being changed,
//       this function deletes any device dependent objects.
//-----------------------------------------------------------------------------
HRESULT CMyD3DApplication::DeleteDeviceObjects()
{
    m_pFont->DeleteDeviceObjects();
    SAFE_RELEASE( m_pFileBasedNormalMap );
    SAFE_RELEASE( m_pCustomNormalMap );

    return S_OK;
}




//-----------------------------------------------------------------------------
// Name: FinalCleanup()
// Desc: Called before the app exits, this function gives the app the chance
//       to cleanup after itself.
//-----------------------------------------------------------------------------
HRESULT CMyD3DApplication::FinalCleanup()
{
    SAFE_DELETE( m_pFont );
    return S_OK;
}




//-----------------------------------------------------------------------------
// Name: ConfirmDevice()
// Desc: Called during device intialization, this code checks the device
//       for some minimum set of capabilities
//-----------------------------------------------------------------------------
HRESULT CMyD3DApplication::ConfirmDevice( D3DCAPS8* pCaps, DWORD dwBehavior, 
                                          D3DFORMAT Format )
{
    if( pCaps->TextureOpCaps & D3DTEXOPCAPS_DOTPRODUCT3 )
        return S_OK;
    
    return E_FAIL;
}




//-----------------------------------------------------------------------------
// Name: MsgProc()
// Desc: Message proc function to handle key and menu input
//-----------------------------------------------------------------------------
LRESULT CMyD3DApplication::MsgProc( HWND hWnd, UINT uMsg, WPARAM wParam,
                                    LPARAM lParam )
{
    if( uMsg == WM_COMMAND )
    {
        switch( LOWORD(wParam) )
        {
            case IDM_USEFILEBASEDTEXTURE:
                m_bUseFileBasedTexture = TRUE;
                CheckMenuItem( GetMenu(hWnd), IDM_USEFILEBASEDTEXTURE, MF_CHECKED );
                CheckMenuItem( GetMenu(hWnd), IDM_USECUSTOMTEXTURE,    MF_UNCHECKED );
                break;
            
            case IDM_USECUSTOMTEXTURE:
                m_bUseFileBasedTexture = FALSE;
                CheckMenuItem( GetMenu(hWnd), IDM_USEFILEBASEDTEXTURE, MF_UNCHECKED );
                CheckMenuItem( GetMenu(hWnd), IDM_USECUSTOMTEXTURE,    MF_CHECKED );
                break;
            
            case IDM_SHOWNORMALMAP:
                m_bShowNormalMap = !m_bShowNormalMap;
                CheckMenuItem( GetMenu(hWnd), IDM_SHOWNORMALMAP,    
                               m_bShowNormalMap ? MF_CHECKED : MF_UNCHECKED );
                break;
        }
    }

    return CD3DApplication::MsgProc( hWnd, uMsg, wParam, lParam );
}



