d3dfont.cpp

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//-----------------------------------------------------------------------------
// File: D3DFont.cpp
//
// Desc: Texture-based font class
//-----------------------------------------------------------------------------
#define STRICT
#include <stdio.h>
#include <tchar.h>
#include <D3DX9.h>
#include "D3DFont.h"
#include "D3DUtil.h"
#include "DXUtil.h"




//-----------------------------------------------------------------------------
// Custom vertex types for rendering text
//-----------------------------------------------------------------------------
#define MAX_NUM_VERTICES 50*6

struct FONT2DVERTEX { D3DXVECTOR4 p;   DWORD color;     FLOAT tu, tv; };
struct FONT3DVERTEX { D3DXVECTOR3 p;   D3DXVECTOR3 n;   FLOAT tu, tv; };

#define D3DFVF_FONT2DVERTEX (D3DFVF_XYZRHW|D3DFVF_DIFFUSE|D3DFVF_TEX1)
#define D3DFVF_FONT3DVERTEX (D3DFVF_XYZ|D3DFVF_NORMAL|D3DFVF_TEX1)

inline FONT2DVERTEX InitFont2DVertex( const D3DXVECTOR4& p, D3DCOLOR color,
                                      FLOAT tu, FLOAT tv )
{
    FONT2DVERTEX v;   v.p = p;   v.color = color;   v.tu = tu;   v.tv = tv;
    return v;
}

inline FONT3DVERTEX InitFont3DVertex( const D3DXVECTOR3& p, const D3DXVECTOR3& n,
                                      FLOAT tu, FLOAT tv )
{
    FONT3DVERTEX v;   v.p = p;   v.n = n;   v.tu = tu;   v.tv = tv;
    return v;
}




//-----------------------------------------------------------------------------
// Name: CD3DFont()
// Desc: Font class constructor
//-----------------------------------------------------------------------------
CD3DFont::CD3DFont( const TCHAR* strFontName, DWORD dwHeight, DWORD dwFlags )
{
    _tcsncpy( m_strFontName, strFontName, sizeof(m_strFontName) / sizeof(TCHAR) );
    m_strFontName[sizeof(m_strFontName) / sizeof(TCHAR) - 1] = _T('\0');
    m_dwFontHeight         = dwHeight;
    m_dwFontFlags          = dwFlags;
    m_dwSpacing            = 0;

    m_pd3dDevice           = NULL;
    m_pTexture             = NULL;
    m_pVB                  = NULL;

    m_pStateBlockSaved     = NULL;
    m_pStateBlockDrawText  = NULL;
}




//-----------------------------------------------------------------------------
// Name: ~CD3DFont()
// Desc: Font class destructor
//-----------------------------------------------------------------------------
CD3DFont::~CD3DFont()
{
    InvalidateDeviceObjects();
    DeleteDeviceObjects();
}




//-----------------------------------------------------------------------------
// Name: InitDeviceObjects()
// Desc: Initializes device-dependent objects, including the vertex buffer used
//       for rendering text and the texture map which stores the font image.
//-----------------------------------------------------------------------------
HRESULT CD3DFont::InitDeviceObjects( LPDIRECT3DDEVICE9 pd3dDevice )
{
    HRESULT hr;

    // Keep a local copy of the device
    m_pd3dDevice = pd3dDevice;

    // Establish the font and texture size
    m_fTextScale  = 1.0f; // Draw fonts into texture without scaling

    // Large fonts need larger textures
    if( m_dwFontHeight > 60 )
        m_dwTexWidth = m_dwTexHeight = 2048;
    else if( m_dwFontHeight > 30 )
        m_dwTexWidth = m_dwTexHeight = 1024;
    else if( m_dwFontHeight > 15 )
        m_dwTexWidth = m_dwTexHeight = 512;
    else
        m_dwTexWidth  = m_dwTexHeight = 256;

    // If requested texture is too big, use a smaller texture and smaller font,
    // and scale up when rendering.
    D3DCAPS9 d3dCaps;
    m_pd3dDevice->GetDeviceCaps( &d3dCaps );

    if( m_dwTexWidth > d3dCaps.MaxTextureWidth )
    {
        m_fTextScale = (FLOAT)d3dCaps.MaxTextureWidth / (FLOAT)m_dwTexWidth;
        m_dwTexWidth = m_dwTexHeight = d3dCaps.MaxTextureWidth;
    }

    // Create a new texture for the font
    hr = m_pd3dDevice->CreateTexture( m_dwTexWidth, m_dwTexHeight, 1,
                                      0, D3DFMT_A4R4G4B4,
                                      D3DPOOL_MANAGED, &m_pTexture, NULL );
    if( FAILED(hr) )
        return hr;

    // Prepare to create a bitmap
    DWORD*      pBitmapBits;
    BITMAPINFO bmi;
    ZeroMemory( &bmi.bmiHeader,  sizeof(BITMAPINFOHEADER) );
    bmi.bmiHeader.biSize        = sizeof(BITMAPINFOHEADER);
    bmi.bmiHeader.biWidth       =  (int)m_dwTexWidth;
    bmi.bmiHeader.biHeight      = -(int)m_dwTexHeight;
    bmi.bmiHeader.biPlanes      = 1;
    bmi.bmiHeader.biCompression = BI_RGB;
    bmi.bmiHeader.biBitCount    = 32;

    // Create a DC and a bitmap for the font
    HDC     hDC       = CreateCompatibleDC( NULL );
    HBITMAP hbmBitmap = CreateDIBSection( hDC, &bmi, DIB_RGB_COLORS,
                                          (void**)&pBitmapBits, NULL, 0 );
    SetMapMode( hDC, MM_TEXT );

    // Create a font.  By specifying ANTIALIASED_QUALITY, we might get an
    // antialiased font, but this is not guaranteed.
    INT nHeight    = -MulDiv( m_dwFontHeight, 
        (INT)(GetDeviceCaps(hDC, LOGPIXELSY) * m_fTextScale), 72 );
    DWORD dwBold   = (m_dwFontFlags&D3DFONT_BOLD)   ? FW_BOLD : FW_NORMAL;
    DWORD dwItalic = (m_dwFontFlags&D3DFONT_ITALIC) ? TRUE    : FALSE;
    HFONT hFont    = CreateFont( nHeight, 0, 0, 0, dwBold, dwItalic,
                          FALSE, FALSE, DEFAULT_CHARSET, OUT_DEFAULT_PRECIS,
                          CLIP_DEFAULT_PRECIS, ANTIALIASED_QUALITY,
                          VARIABLE_PITCH, m_strFontName );
    if( NULL==hFont )
        return E_FAIL;

    HGDIOBJ hbmOld = SelectObject( hDC, hbmBitmap );
    HGDIOBJ hFontOld = SelectObject( hDC, hFont );

    // Set text properties
    SetTextColor( hDC, RGB(255,255,255) );
    SetBkColor(   hDC, 0x00000000 );
    SetTextAlign( hDC, TA_TOP );

    // Loop through all printable character and output them to the bitmap..
    // Meanwhile, keep track of the corresponding tex coords for each character.
    DWORD x = 0;
    DWORD y = 0;
    TCHAR str[2] = _T("x");
    SIZE size;

    // Calculate the spacing between characters based on line height
    GetTextExtentPoint32( hDC, TEXT(" "), 1, &size );
    x = m_dwSpacing = (DWORD) ceil(size.cy * 0.3f);

    for( TCHAR c=32; c<127; c++ )
    {
        str[0] = c;
        GetTextExtentPoint32( hDC, str, 1, &size );

        if( (DWORD)(x + size.cx + m_dwSpacing) > m_dwTexWidth )
        {
            x  = m_dwSpacing;
            y += size.cy+1;
        }

        ExtTextOut( hDC, x+0, y+0, ETO_OPAQUE, NULL, str, 1, NULL );

        m_fTexCoords[c-32][0] = ((FLOAT)(x + 0       - m_dwSpacing))/m_dwTexWidth;
        m_fTexCoords[c-32][1] = ((FLOAT)(y + 0       + 0          ))/m_dwTexHeight;
        m_fTexCoords[c-32][2] = ((FLOAT)(x + size.cx + m_dwSpacing))/m_dwTexWidth;
        m_fTexCoords[c-32][3] = ((FLOAT)(y + size.cy + 0          ))/m_dwTexHeight;

        x += size.cx + (2 * m_dwSpacing);
    }

    // Lock the surface and write the alpha values for the set pixels
    D3DLOCKED_RECT d3dlr;
    m_pTexture->LockRect( 0, &d3dlr, 0, 0 );
    BYTE* pDstRow = (BYTE*)d3dlr.pBits;
    WORD* pDst16;
    BYTE bAlpha; // 4-bit measure of pixel intensity

    for( y=0; y < m_dwTexHeight; y++ )
    {
        pDst16 = (WORD*)pDstRow;
        for( x=0; x < m_dwTexWidth; x++ )
        {
            bAlpha = (BYTE)((pBitmapBits[m_dwTexWidth*y + x] & 0xff) >> 4);
            if (bAlpha > 0)
            {
                *pDst16++ = (WORD) ((bAlpha << 12) | 0x0fff);
            }
            else
            {
                *pDst16++ = 0x0000;
            }
        }
        pDstRow += d3dlr.Pitch;
    }

    // Done updating texture, so clean up used objects
    m_pTexture->UnlockRect(0);
    SelectObject( hDC, hbmOld );
    SelectObject( hDC, hFontOld );
    DeleteObject( hbmBitmap );
    DeleteObject( hFont );
    DeleteDC( hDC );

    return S_OK;
}




//-----------------------------------------------------------------------------
// Name: RestoreDeviceObjects()
// Desc:
//-----------------------------------------------------------------------------
HRESULT CD3DFont::RestoreDeviceObjects()
{
    HRESULT hr;

    // Create vertex buffer for the letters
    int vertexSize = max( sizeof(FONT2DVERTEX), sizeof(FONT3DVERTEX ) );
    if( FAILED( hr = m_pd3dDevice->CreateVertexBuffer( MAX_NUM_VERTICES * vertexSize,
                                                       D3DUSAGE_WRITEONLY | D3DUSAGE_DYNAMIC, 0,
                                                       D3DPOOL_DEFAULT, &m_pVB, NULL ) ) )
    {
        return hr;
    }

    // Create the state blocks for rendering text
    for( UINT which=0; which<2; which++ )
    {
        m_pd3dDevice->BeginStateBlock();
        m_pd3dDevice->SetTexture( 0, m_pTexture );

        if ( D3DFONT_ZENABLE & m_dwFontFlags )
            m_pd3dDevice->SetRenderState( D3DRS_ZENABLE, TRUE );
        else
            m_pd3dDevice->SetRenderState( D3DRS_ZENABLE, FALSE );

        m_pd3dDevice->SetRenderState( D3DRS_ALPHABLENDENABLE, TRUE );
        m_pd3dDevice->SetRenderState( D3DRS_SRCBLEND,   D3DBLEND_SRCALPHA );
        m_pd3dDevice->SetRenderState( D3DRS_DESTBLEND,  D3DBLEND_INVSRCALPHA );
        m_pd3dDevice->SetRenderState( D3DRS_ALPHATESTENABLE,  TRUE );
        m_pd3dDevice->SetRenderState( D3DRS_ALPHAREF,         0x08 );
        m_pd3dDevice->SetRenderState( D3DRS_ALPHAFUNC,  D3DCMP_GREATEREQUAL );
        m_pd3dDevice->SetRenderState( D3DRS_FILLMODE,   D3DFILL_SOLID );
        m_pd3dDevice->SetRenderState( D3DRS_CULLMODE,   D3DCULL_CCW );
        m_pd3dDevice->SetRenderState( D3DRS_STENCILENABLE,    FALSE );
        m_pd3dDevice->SetRenderState( D3DRS_CLIPPING,         TRUE );
        m_pd3dDevice->SetRenderState( D3DRS_CLIPPLANEENABLE,  FALSE );
        m_pd3dDevice->SetRenderState( D3DRS_VERTEXBLEND,      D3DVBF_DISABLE );
        m_pd3dDevice->SetRenderState( D3DRS_INDEXEDVERTEXBLENDENABLE, FALSE );
        m_pd3dDevice->SetRenderState( D3DRS_FOGENABLE,        FALSE );
        m_pd3dDevice->SetRenderState( D3DRS_COLORWRITEENABLE,
            D3DCOLORWRITEENABLE_RED  | D3DCOLORWRITEENABLE_GREEN |
            D3DCOLORWRITEENABLE_BLUE | D3DCOLORWRITEENABLE_ALPHA );
        m_pd3dDevice->SetTextureStageState( 0, D3DTSS_COLOROP,   D3DTOP_MODULATE );
        m_pd3dDevice->SetTextureStageState( 0, D3DTSS_COLORARG1, D3DTA_TEXTURE );
        m_pd3dDevice->SetTextureStageState( 0, D3DTSS_COLORARG2, D3DTA_DIFFUSE );
        m_pd3dDevice->SetTextureStageState( 0, D3DTSS_ALPHAOP,   D3DTOP_MODULATE );
        m_pd3dDevice->SetTextureStageState( 0, D3DTSS_ALPHAARG1, D3DTA_TEXTURE );
        m_pd3dDevice->SetTextureStageState( 0, D3DTSS_ALPHAARG2, D3DTA_DIFFUSE );
        m_pd3dDevice->SetTextureStageState( 0, D3DTSS_TEXCOORDINDEX, 0 );
        m_pd3dDevice->SetTextureStageState( 0, D3DTSS_TEXTURETRANSFORMFLAGS, D3DTTFF_DISABLE );
        m_pd3dDevice->SetTextureStageState( 1, D3DTSS_COLOROP,   D3DTOP_DISABLE );
        m_pd3dDevice->SetTextureStageState( 1, D3DTSS_ALPHAOP,   D3DTOP_DISABLE );
        m_pd3dDevice->SetSamplerState( 0, D3DSAMP_MINFILTER, D3DTEXF_POINT );
        m_pd3dDevice->SetSamplerState( 0, D3DSAMP_MAGFILTER, D3DTEXF_POINT );
        m_pd3dDevice->SetSamplerState( 0, D3DSAMP_MIPFILTER, D3DTEXF_NONE );

        if( which==0 )
            m_pd3dDevice->EndStateBlock( &m_pStateBlockSaved );
        else
            m_pd3dDevice->EndStateBlock( &m_pStateBlockDrawText );
    }

    return S_OK;
}




//-----------------------------------------------------------------------------
// Name: InvalidateDeviceObjects()
// Desc: Destroys all device-dependent objects
//-----------------------------------------------------------------------------
HRESULT CD3DFont::InvalidateDeviceObjects()
{
    SAFE_RELEASE( m_pVB );
    SAFE_RELEASE( m_pStateBlockSaved );
    SAFE_RELEASE( m_pStateBlockDrawText );

    return S_OK;
}




//-----------------------------------------------------------------------------
// Name: DeleteDeviceObjects()
// Desc: Destroys all device-dependent objects
//-----------------------------------------------------------------------------
HRESULT CD3DFont::DeleteDeviceObjects()
{
    SAFE_RELEASE( m_pTexture );
    m_pd3dDevice = NULL;

    return S_OK;
}




//-----------------------------------------------------------------------------
// Name: GetTextExtent()
// Desc: Get the dimensions of a text string
//-----------------------------------------------------------------------------
HRESULT CD3DFont::GetTextExtent( const TCHAR* strText, SIZE* pSize )
{
    if( NULL==strText || NULL==pSize )
        return E_FAIL;

    FLOAT fRowWidth  = 0.0f;
    FLOAT fRowHeight = (m_fTexCoords[0][3]-m_fTexCoords[0][1])*m_dwTexHeight;
    FLOAT fWidth     = 0.0f;
    FLOAT fHeight    = fRowHeight;

    while( *strText )
    {
        TCHAR c = *strText++;

        if( c == _T('\n') )
        {
            fRowWidth = 0.0f;
            fHeight  += fRowHeight;
        }

        if( (c-32) < 0 || (c-32) >= 128-32 )
            continue;

        FLOAT tx1 = m_fTexCoords[c-32][0];
        FLOAT tx2 = m_fTexCoords[c-32][2];

        fRowWidth += (tx2-tx1)*m_dwTexWidth - 2*m_dwSpacing;

        if( fRowWidth > fWidth )
            fWidth = fRowWidth;
    }

    pSize->cx = (int)fWidth;
    pSize->cy = (int)fHeight;

    return S_OK;
}