d3dfont.cpp

这个一个3D游戏源码,实现装入mesh,并渲染以及矩阵相乘

//-----------------------------------------------------------------------------
// Name: DrawTextScaled()
// Desc: Draws scaled 2D text.  Note that x and y are in viewport coordinates
//       (ranging from -1 to +1).  fXScale and fYScale are the size fraction 
//       relative to the entire viewport.  For example, a fXScale of 0.25 is
//       1/8th of the screen width.  This allows you to output text at a fixed
//       fraction of the viewport, even if the screen or window size changes.
//-----------------------------------------------------------------------------
HRESULT CD3DFont::DrawTextScaled( FLOAT x, FLOAT y, FLOAT z,
                                  FLOAT fXScale, FLOAT fYScale, DWORD dwColor,
                                  const TCHAR* strText, DWORD dwFlags )
{
    if( m_pd3dDevice == NULL )
        return E_FAIL;

    // Set up renderstate
    m_pStateBlockSaved->Capture();
    m_pStateBlockDrawText->Apply();
    m_pd3dDevice->SetFVF( D3DFVF_FONT2DVERTEX );
    m_pd3dDevice->SetPixelShader( NULL );
    m_pd3dDevice->SetStreamSource( 0, m_pVB, 0, sizeof(FONT2DVERTEX) );

    // Set filter states
    if( dwFlags & D3DFONT_FILTERED )
    {
        m_pd3dDevice->SetSamplerState( 0, D3DSAMP_MINFILTER, D3DTEXF_LINEAR );
        m_pd3dDevice->SetSamplerState( 0, D3DSAMP_MAGFILTER, D3DTEXF_LINEAR );
    }

    D3DVIEWPORT9 vp;
    m_pd3dDevice->GetViewport( &vp );
    FLOAT fLineHeight = ( m_fTexCoords[0][3] - m_fTexCoords[0][1] ) * m_dwTexHeight;

    // Center the text block in the viewport
    if( dwFlags & D3DFONT_CENTERED_X )
    {
        const TCHAR* strTextTmp = strText;
        float xFinal = 0.0f;

        while( *strTextTmp )
        {
            TCHAR c = *strTextTmp++;
    
            if( c == _T('\n') )
                break;  // Isn't supported.  
            if( (c-32) < 0 || (c-32) >= 128-32 )
                continue;

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

            FLOAT w = (tx2-tx1)*m_dwTexWidth;

            w *= (fXScale*vp.Height)/fLineHeight;

            xFinal += w - (2 * m_dwSpacing) * (fXScale*vp.Height)/fLineHeight;
        }

        x = -xFinal/vp.Width;
    }
    if( dwFlags & D3DFONT_CENTERED_Y )
    {
        y = -fLineHeight/vp.Height;
    }

    FLOAT sx  = (x+1.0f)*vp.Width/2;
    FLOAT sy  = (y+1.0f)*vp.Height/2;
    FLOAT sz  = z;
    FLOAT rhw = 1.0f;

    // Adjust for character spacing
    sx -= m_dwSpacing * (fXScale*vp.Height)/fLineHeight;
    FLOAT fStartX = sx;

    // Fill vertex buffer
    FONT2DVERTEX* pVertices;
    DWORD         dwNumTriangles = 0L;
    m_pVB->Lock( 0, 0, (void**)&pVertices, D3DLOCK_DISCARD );

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

        if( c == _T('\n') )
        {
            sx  = fStartX;
            sy += fYScale*vp.Height;
        }

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

        FLOAT tx1 = m_fTexCoords[c-32][0];
        FLOAT ty1 = m_fTexCoords[c-32][1];
        FLOAT tx2 = m_fTexCoords[c-32][2];
        FLOAT ty2 = m_fTexCoords[c-32][3];

        FLOAT w = (tx2-tx1)*m_dwTexWidth;
        FLOAT h = (ty2-ty1)*m_dwTexHeight;

        w *= (fXScale*vp.Height)/fLineHeight;
        h *= (fYScale*vp.Height)/fLineHeight;

        if( c != _T(' ') )
        {
            *pVertices++ = InitFont2DVertex( D3DXVECTOR4(sx+0-0.5f,sy+h-0.5f,sz,rhw), dwColor, tx1, ty2 );
            *pVertices++ = InitFont2DVertex( D3DXVECTOR4(sx+0-0.5f,sy+0-0.5f,sz,rhw), dwColor, tx1, ty1 );
            *pVertices++ = InitFont2DVertex( D3DXVECTOR4(sx+w-0.5f,sy+h-0.5f,sz,rhw), dwColor, tx2, ty2 );
            *pVertices++ = InitFont2DVertex( D3DXVECTOR4(sx+w-0.5f,sy+0-0.5f,sz,rhw), dwColor, tx2, ty1 );
            *pVertices++ = InitFont2DVertex( D3DXVECTOR4(sx+w-0.5f,sy+h-0.5f,sz,rhw), dwColor, tx2, ty2 );
            *pVertices++ = InitFont2DVertex( D3DXVECTOR4(sx+0-0.5f,sy+0-0.5f,sz,rhw), dwColor, tx1, ty1 );
            dwNumTriangles += 2;

            if( dwNumTriangles*3 > (MAX_NUM_VERTICES-6) )
            {
                // Unlock, render, and relock the vertex buffer
                m_pVB->Unlock();
                m_pd3dDevice->DrawPrimitive( D3DPT_TRIANGLELIST, 0, dwNumTriangles );
                m_pVB->Lock( 0, 0, (void**)&pVertices, D3DLOCK_DISCARD );
                dwNumTriangles = 0L;
            }
        }

        sx += w - (2 * m_dwSpacing) * (fXScale*vp.Height)/fLineHeight;
    }

    // Unlock and render the vertex buffer
    m_pVB->Unlock();
    if( dwNumTriangles > 0 )
        m_pd3dDevice->DrawPrimitive( D3DPT_TRIANGLELIST, 0, dwNumTriangles );

    // Restore the modified renderstates
    m_pStateBlockSaved->Apply();

    return S_OK;
}




//-----------------------------------------------------------------------------
// Name: DrawText()
// Desc: Draws 2D text. Note that sx and sy are in pixels
//-----------------------------------------------------------------------------
HRESULT CD3DFont::DrawText( FLOAT sx, FLOAT sy, DWORD dwColor,
                            const TCHAR* strText, DWORD dwFlags )
{
    if( m_pd3dDevice == NULL )
        return E_FAIL;

    // Setup renderstate
    m_pStateBlockSaved->Capture();
    m_pStateBlockDrawText->Apply();
    m_pd3dDevice->SetFVF( D3DFVF_FONT2DVERTEX );
    m_pd3dDevice->SetPixelShader( NULL );
    m_pd3dDevice->SetStreamSource( 0, m_pVB, 0, sizeof(FONT2DVERTEX) );

    // Set filter states
    if( dwFlags & D3DFONT_FILTERED )
    {
        m_pd3dDevice->SetSamplerState( 0, D3DSAMP_MINFILTER, D3DTEXF_LINEAR );
        m_pd3dDevice->SetSamplerState( 0, D3DSAMP_MAGFILTER, D3DTEXF_LINEAR );
    }

    // Center the text block in the viewport
    if( dwFlags & D3DFONT_CENTERED_X )
    {
        D3DVIEWPORT9 vp;
        m_pd3dDevice->GetViewport( &vp );
        const TCHAR* strTextTmp = strText;
        float xFinal = 0.0f;

        while( *strTextTmp )
        {
            TCHAR c = *strTextTmp++;
    
            if( c == _T('\n') )
                break;  // Isn't supported.  
            if( (c-32) < 0 || (c-32) >= 128-32 )
                continue;

            FLOAT tx1 = m_fTexCoords[c-32][0];
            FLOAT tx2 = m_fTexCoords[c-32][2];
    
            FLOAT w = (tx2-tx1) *  m_dwTexWidth / m_fTextScale;
    
            xFinal += w - (2 * m_dwSpacing);
        }

        sx = (vp.Width-xFinal)/2.0f;
    }
    if( dwFlags & D3DFONT_CENTERED_Y )
    {
        D3DVIEWPORT9 vp;
        m_pd3dDevice->GetViewport( &vp );
        float fLineHeight = ((m_fTexCoords[0][3]-m_fTexCoords[0][1])*m_dwTexHeight);
        sy = (vp.Height-fLineHeight)/2;
    }

    // Adjust for character spacing
    sx -= m_dwSpacing;
    FLOAT fStartX = sx;

    // Fill vertex buffer
    FONT2DVERTEX* pVertices = NULL;
    DWORD         dwNumTriangles = 0;
    m_pVB->Lock( 0, 0, (void**)&pVertices, D3DLOCK_DISCARD );

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

        if( c == _T('\n') )
        {
            sx = fStartX;
            sy += (m_fTexCoords[0][3]-m_fTexCoords[0][1])*m_dwTexHeight;
        }

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

        FLOAT tx1 = m_fTexCoords[c-32][0];
        FLOAT ty1 = m_fTexCoords[c-32][1];
        FLOAT tx2 = m_fTexCoords[c-32][2];
        FLOAT ty2 = m_fTexCoords[c-32][3];

        FLOAT w = (tx2-tx1) *  m_dwTexWidth / m_fTextScale;
        FLOAT h = (ty2-ty1) * m_dwTexHeight / m_fTextScale;

        if( c != _T(' ') )
        {
            *pVertices++ = InitFont2DVertex( D3DXVECTOR4(sx+0-0.5f,sy+h-0.5f,0.9f,1.0f), dwColor, tx1, ty2 );
            *pVertices++ = InitFont2DVertex( D3DXVECTOR4(sx+0-0.5f,sy+0-0.5f,0.9f,1.0f), dwColor, tx1, ty1 );
            *pVertices++ = InitFont2DVertex( D3DXVECTOR4(sx+w-0.5f,sy+h-0.5f,0.9f,1.0f), dwColor, tx2, ty2 );
            *pVertices++ = InitFont2DVertex( D3DXVECTOR4(sx+w-0.5f,sy+0-0.5f,0.9f,1.0f), dwColor, tx2, ty1 );
            *pVertices++ = InitFont2DVertex( D3DXVECTOR4(sx+w-0.5f,sy+h-0.5f,0.9f,1.0f), dwColor, tx2, ty2 );
            *pVertices++ = InitFont2DVertex( D3DXVECTOR4(sx+0-0.5f,sy+0-0.5f,0.9f,1.0f), dwColor, tx1, ty1 );
            dwNumTriangles += 2;

            if( dwNumTriangles*3 > (MAX_NUM_VERTICES-6) )
            {
                // Unlock, render, and relock the vertex buffer
                m_pVB->Unlock();
                m_pd3dDevice->DrawPrimitive( D3DPT_TRIANGLELIST, 0, dwNumTriangles );
                pVertices = NULL;
                m_pVB->Lock( 0, 0, (void**)&pVertices, D3DLOCK_DISCARD );
                dwNumTriangles = 0L;
            }
        }

        sx += w - (2 * m_dwSpacing);
    }

    // Unlock and render the vertex buffer
    m_pVB->Unlock();
    if( dwNumTriangles > 0 )
        m_pd3dDevice->DrawPrimitive( D3DPT_TRIANGLELIST, 0, dwNumTriangles );

    // Restore the modified renderstates
    m_pStateBlockSaved->Apply();

    return S_OK;
}




//-----------------------------------------------------------------------------
// Name: Render3DText()
// Desc: Renders 3D text
//-----------------------------------------------------------------------------
HRESULT CD3DFont::Render3DText( const TCHAR* strText, DWORD dwFlags )
{
    if( m_pd3dDevice == NULL )
        return E_FAIL;

    // Setup renderstate
    m_pStateBlockSaved->Capture();
    m_pStateBlockDrawText->Apply();
    m_pd3dDevice->SetFVF( D3DFVF_FONT3DVERTEX );
    m_pd3dDevice->SetPixelShader( NULL );
    m_pd3dDevice->SetStreamSource( 0, m_pVB, 0, sizeof(FONT3DVERTEX) );

    // Set filter states
    if( dwFlags & D3DFONT_FILTERED )
    {
        m_pd3dDevice->SetSamplerState( 0, D3DSAMP_MINFILTER, D3DTEXF_LINEAR );
        m_pd3dDevice->SetSamplerState( 0, D3DSAMP_MAGFILTER, D3DTEXF_LINEAR );
    }

    // Position for each text element
    FLOAT x = 0.0f;
    FLOAT y = 0.0f;

    // Center the text block at the origin (not the viewport)
    if( dwFlags & D3DFONT_CENTERED_X )
    {
        SIZE sz;
        GetTextExtent( strText, &sz );
        x = -(((FLOAT)sz.cx)/10.0f)/2.0f;
    }
    if( dwFlags & D3DFONT_CENTERED_Y )
    {
        SIZE sz;
        GetTextExtent( strText, &sz );
        y = -(((FLOAT)sz.cy)/10.0f)/2.0f;
    }

    // Turn off culling for two-sided text
    if( dwFlags & D3DFONT_TWOSIDED )
        m_pd3dDevice->SetRenderState( D3DRS_CULLMODE, D3DCULL_NONE );

    // Adjust for character spacing
    x -= m_dwSpacing / 10.0f;
    FLOAT fStartX = x;
    TCHAR c;

    // Fill vertex buffer
    FONT3DVERTEX* pVertices;
    DWORD         dwNumTriangles = 0L;
    m_pVB->Lock( 0, 0, (void**)&pVertices, D3DLOCK_DISCARD );

    while( (c = *strText++) != 0 )
    {
        if( c == '\n' )
        {
            x = fStartX;
            y -= (m_fTexCoords[0][3]-m_fTexCoords[0][1])*m_dwTexHeight/10.0f;
        }

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

        FLOAT tx1 = m_fTexCoords[c-32][0];
        FLOAT ty1 = m_fTexCoords[c-32][1];
        FLOAT tx2 = m_fTexCoords[c-32][2];
        FLOAT ty2 = m_fTexCoords[c-32][3];

        FLOAT w = (tx2-tx1) * m_dwTexWidth  / ( 10.0f * m_fTextScale );
        FLOAT h = (ty2-ty1) * m_dwTexHeight / ( 10.0f * m_fTextScale );

        if( c != _T(' ') )
        {
            *pVertices++ = InitFont3DVertex( D3DXVECTOR3(x+0,y+0,0), D3DXVECTOR3(0,0,-1), tx1, ty2 );
            *pVertices++ = InitFont3DVertex( D3DXVECTOR3(x+0,y+h,0), D3DXVECTOR3(0,0,-1), tx1, ty1 );
            *pVertices++ = InitFont3DVertex( D3DXVECTOR3(x+w,y+0,0), D3DXVECTOR3(0,0,-1), tx2, ty2 );
            *pVertices++ = InitFont3DVertex( D3DXVECTOR3(x+w,y+h,0), D3DXVECTOR3(0,0,-1), tx2, ty1 );
            *pVertices++ = InitFont3DVertex( D3DXVECTOR3(x+w,y+0,0), D3DXVECTOR3(0,0,-1), tx2, ty2 );
            *pVertices++ = InitFont3DVertex( D3DXVECTOR3(x+0,y+h,0), D3DXVECTOR3(0,0,-1), tx1, ty1 );
            dwNumTriangles += 2;

            if( dwNumTriangles*3 > (MAX_NUM_VERTICES-6) )
            {
                // Unlock, render, and relock the vertex buffer
                m_pVB->Unlock();
                m_pd3dDevice->DrawPrimitive( D3DPT_TRIANGLELIST, 0, dwNumTriangles );
                m_pVB->Lock( 0, 0, (void**)&pVertices, D3DLOCK_DISCARD );
                dwNumTriangles = 0L;
            }
        }

        x += w - (2 * m_dwSpacing) / 10.0f;
    }

    // Unlock and render the vertex buffer
    m_pVB->Unlock();
    if( dwNumTriangles > 0 )
        m_pd3dDevice->DrawPrimitive( D3DPT_TRIANGLELIST, 0, dwNumTriangles );

    // Restore the modified renderstates
    m_pStateBlockSaved->Apply();

    return S_OK;
}