//-----------------------------------------------------------------------------
// File: D3DUtil.cpp
//
// Desc: Shortcut macros and functions for using DirectX objects
//
// Copyright (c) Microsoft Corporation. All rights reserved
//-----------------------------------------------------------------------------
#define STRICT
#include "stdafx.h"
#include <Windows.h>
#include <WindowsX.h>
#include <tchar.h>
#include <stdio.h>
#include "D3DUtil.h"
#include "DXUtil.h"
#include "D3DX9.h"
//-----------------------------------------------------------------------------
// Name: D3DUtil_InitMaterial()
// Desc: Initializes a D3DMATERIAL9 structure, setting the diffuse and ambient
// colors. It does not set emissive or specular colors.
//-----------------------------------------------------------------------------
VOID D3DUtil_InitMaterial( D3DMATERIAL9& mtrl, FLOAT r, FLOAT g, FLOAT b,
FLOAT a )
{
ZeroMemory( &mtrl, sizeof(D3DMATERIAL9) );
mtrl.Diffuse.r = mtrl.Ambient.r = r;
mtrl.Diffuse.g = mtrl.Ambient.g = g;
mtrl.Diffuse.b = mtrl.Ambient.b = b;
mtrl.Diffuse.a = mtrl.Ambient.a = a;
}
//-----------------------------------------------------------------------------
// Name: D3DUtil_InitLight()
// Desc: Initializes a D3DLIGHT structure, setting the light position. The
// diffuse color is set to white; specular and ambient are left as black.
//-----------------------------------------------------------------------------
VOID D3DUtil_InitLight( D3DLIGHT9& light, D3DLIGHTTYPE ltType,
FLOAT x, FLOAT y, FLOAT z )
{
D3DXVECTOR3 vecLightDirUnnormalized(x, y, z);
ZeroMemory( &light, sizeof(D3DLIGHT9) );
light.Type = ltType;
light.Diffuse.r = 1.0f;
light.Diffuse.g = 1.0f;
light.Diffuse.b = 1.0f;
D3DXVec3Normalize( (D3DXVECTOR3*)&light.Direction, &vecLightDirUnnormalized );
light.Position.x = x;
light.Position.y = y;
light.Position.z = z;
light.Range = 1000.0f;
}
//-----------------------------------------------------------------------------
// Name: D3DUtil_CreateTexture()
// Desc: Helper function to create a texture. It checks the root path first,
// then tries the DXSDK media path (as specified in the system registry).
//-----------------------------------------------------------------------------
HRESULT D3DUtil_CreateTexture( LPDIRECT3DDEVICE9 pd3dDevice, TCHAR* strTexture,
LPDIRECT3DTEXTURE9* ppTexture, D3DFORMAT d3dFormat )
{
HRESULT hr;
TCHAR strPath[MAX_PATH];
// Get the path to the texture
if( FAILED( hr = DXUtil_FindMediaFileCb( strPath, sizeof(strPath), strTexture ) ) )
return hr;
// Create the texture using D3DX
return D3DXCreateTextureFromFileEx( pd3dDevice, strPath,
D3DX_DEFAULT, D3DX_DEFAULT, D3DX_DEFAULT, 0, d3dFormat,
D3DPOOL_MANAGED, D3DX_FILTER_TRIANGLE|D3DX_FILTER_MIRROR,
D3DX_FILTER_TRIANGLE|D3DX_FILTER_MIRROR, 0, NULL, NULL, ppTexture );
}
//-----------------------------------------------------------------------------
// Name: D3DUtil_GetCubeMapViewMatrix()
// Desc: Returns a view matrix for rendering to a face of a cubemap.
//-----------------------------------------------------------------------------
D3DXMATRIX D3DUtil_GetCubeMapViewMatrix( DWORD dwFace )
{
D3DXVECTOR3 vEyePt = D3DXVECTOR3( 0.0f, 0.0f, 0.0f );
D3DXVECTOR3 vLookDir;
D3DXVECTOR3 vUpDir;
switch( dwFace )
{
case D3DCUBEMAP_FACE_POSITIVE_X:
vLookDir = D3DXVECTOR3( 1.0f, 0.0f, 0.0f );
vUpDir = D3DXVECTOR3( 0.0f, 1.0f, 0.0f );
break;
case D3DCUBEMAP_FACE_NEGATIVE_X:
vLookDir = D3DXVECTOR3(-1.0f, 0.0f, 0.0f );
vUpDir = D3DXVECTOR3( 0.0f, 1.0f, 0.0f );
break;
case D3DCUBEMAP_FACE_POSITIVE_Y:
vLookDir = D3DXVECTOR3( 0.0f, 1.0f, 0.0f );
vUpDir = D3DXVECTOR3( 0.0f, 0.0f,-1.0f );
break;
case D3DCUBEMAP_FACE_NEGATIVE_Y:
vLookDir = D3DXVECTOR3( 0.0f,-1.0f, 0.0f );
vUpDir = D3DXVECTOR3( 0.0f, 0.0f, 1.0f );
break;
case D3DCUBEMAP_FACE_POSITIVE_Z:
vLookDir = D3DXVECTOR3( 0.0f, 0.0f, 1.0f );
vUpDir = D3DXVECTOR3( 0.0f, 1.0f, 0.0f );
break;
case D3DCUBEMAP_FACE_NEGATIVE_Z:
vLookDir = D3DXVECTOR3( 0.0f, 0.0f,-1.0f );
vUpDir = D3DXVECTOR3( 0.0f, 1.0f, 0.0f );
break;
}
// Set the view transform for this cubemap surface
D3DXMATRIXA16 matView;
D3DXMatrixLookAtLH( &matView, &vEyePt, &vLookDir, &vUpDir );
return matView;
}
//-----------------------------------------------------------------------------
// Name: D3DUtil_GetRotationFromCursor()
// Desc: Returns a quaternion for the rotation implied by the window's cursor
// position.
//-----------------------------------------------------------------------------
D3DXQUATERNION D3DUtil_GetRotationFromCursor( HWND hWnd,
FLOAT fTrackBallRadius )
{
POINT pt;
RECT rc;
GetCursorPos( &pt );
GetClientRect( hWnd, &rc );
ScreenToClient( hWnd, &pt );
FLOAT sx = ( ( ( 2.0f * pt.x ) / (rc.right-rc.left) ) - 1 );
FLOAT sy = ( ( ( 2.0f * pt.y ) / (rc.bottom-rc.top) ) - 1 );
FLOAT sz;
if( sx == 0.0f && sy == 0.0f )
return D3DXQUATERNION( 0.0f, 0.0f, 0.0f, 1.0f );
FLOAT d2 = sqrtf( sx*sx + sy*sy );
if( d2 < fTrackBallRadius * 0.70710678118654752440 ) // Inside sphere
sz = sqrtf( fTrackBallRadius*fTrackBallRadius - d2*d2 );
else // On hyperbola
sz = (fTrackBallRadius*fTrackBallRadius) / (2.0f*d2);
// Get two points on trackball's sphere
D3DXVECTOR3 p1( sx, sy, sz );
D3DXVECTOR3 p2( 0.0f, 0.0f, fTrackBallRadius );
// Get axis of rotation, which is cross product of p1 and p2
D3DXVECTOR3 vAxis;
D3DXVec3Cross( &vAxis, &p1, &p2);
// Calculate angle for the rotation about that axis
D3DXVECTOR3 vecDiff = p2-p1;
FLOAT t = D3DXVec3Length( &vecDiff ) / ( 2.0f*fTrackBallRadius );
if( t > +1.0f) t = +1.0f;
if( t < -1.0f) t = -1.0f;
FLOAT fAngle = 2.0f * asinf( t );
// Convert axis to quaternion
D3DXQUATERNION quat;
D3DXQuaternionRotationAxis( &quat, &vAxis, fAngle );
return quat;
}
//-----------------------------------------------------------------------------
// Name: D3DUtil_SetDeviceCursor
// Desc: Gives the D3D device a cursor with image and hotspot from hCursor.
//-----------------------------------------------------------------------------
HRESULT D3DUtil_SetDeviceCursor( LPDIRECT3DDEVICE9 pd3dDevice, HCURSOR hCursor,
BOOL bAddWatermark )
{
HRESULT hr = E_FAIL;
ICONINFO iconinfo;
BOOL bBWCursor;
LPDIRECT3DSURFACE9 pCursorSurface = NULL;
HDC hdcColor = NULL;
HDC hdcMask = NULL;
HDC hdcScreen = NULL;
BITMAP bm;
DWORD dwWidth;
DWORD dwHeightSrc;
DWORD dwHeightDest;
COLORREF crColor;
COLORREF crMask;
UINT x;
UINT y;
BITMAPINFO bmi;
COLORREF* pcrArrayColor = NULL;
COLORREF* pcrArrayMask = NULL;
DWORD* pBitmap;
HGDIOBJ hgdiobjOld;
ZeroMemory( &iconinfo, sizeof(iconinfo) );
if( !GetIconInfo( hCursor, &iconinfo ) )
goto End;
if (0 == GetObject((HGDIOBJ)iconinfo.hbmMask, sizeof(BITMAP), (LPVOID)&bm))
goto End;
dwWidth = bm.bmWidth;
dwHeightSrc = bm.bmHeight;
if( iconinfo.hbmColor == NULL )
{
bBWCursor = TRUE;
dwHeightDest = dwHeightSrc / 2;
}
else
{
bBWCursor = FALSE;
dwHeightDest = dwHeightSrc;
}
// Create a surface for the fullscreen cursor
if( FAILED( hr = pd3dDevice->CreateOffscreenPlainSurface( dwWidth, dwHeightDest,
D3DFMT_A8R8G8B8, D3DPOOL_SCRATCH, &pCursorSurface, NULL ) ) )
{
goto End;
}
pcrArrayMask = new DWORD[dwWidth * dwHeightSrc];
ZeroMemory(&bmi, sizeof(bmi));
bmi.bmiHeader.biSize = sizeof(bmi.bmiHeader);
bmi.bmiHeader.biWidth = dwWidth;
bmi.bmiHeader.biHeight = dwHeightSrc;
bmi.bmiHeader.biPlanes = 1;
bmi.bmiHeader.biBitCount = 32;
bmi.bmiHeader.biCompression = BI_RGB;
hdcScreen = GetDC( NULL );
hdcMask = CreateCompatibleDC( hdcScreen );
if( hdcMask == NULL )
{
hr = E_FAIL;
goto End;
}
hgdiobjOld = SelectObject(hdcMask, iconinfo.hbmMask);
GetDIBits(hdcMask, iconinfo.hbmMask, 0, dwHeightSrc,
pcrArrayMask, &bmi, DIB_RGB_COLORS);
SelectObject(hdcMask, hgdiobjOld);
if (!bBWCursor)
{
pcrArrayColor = new DWORD[dwWidth * dwHeightDest];
hdcColor = CreateCompatibleDC( hdcScreen );
if( hdcColor == NULL )
{
hr = E_FAIL;
goto End;
}
SelectObject(hdcColor, iconinfo.hbmColor);
GetDIBits(hdcColor, iconinfo.hbmColor, 0, dwHeightDest,
pcrArrayColor, &bmi, DIB_RGB_COLORS);
}
// Transfer cursor image into the surface
D3DLOCKED_RECT lr;
pCursorSurface->LockRect( &lr, NULL, 0 );
pBitmap = (DWORD*)lr.pBits;
for( y = 0; y < dwHeightDest; y++ )
{
for( x = 0; x < dwWidth; x++ )
{
if (bBWCursor)
{
crColor = pcrArrayMask[dwWidth*(dwHeightDest-1-y) + x];
crMask = pcrArrayMask[dwWidth*(dwHeightSrc-1-y) + x];
}
else
{
crColor = pcrArrayColor[dwWidth*(dwHeightDest-1-y) + x];
crMask = pcrArrayMask[dwWidth*(dwHeightDest-1-y) + x];
}
if (crMask == 0)
pBitmap[dwWidth*y + x] = 0xff000000 | crColor;
else
pBitmap[dwWidth*y + x] = 0x00000000;
// It may be helpful to make the D3D cursor look slightly
// different from the Windows cursor so you can distinguish
// between the two when developing/testing code. When
// bAddWatermark is TRUE, the following code adds some
// small grey "D3D" characters to the upper-left corner of
// the D3D cursor image.
if( bAddWatermark && x < 12 && y < 5 )
{
// 11.. 11.. 11.. .... CCC0
// 1.1. ..1. 1.1. .... A2A0
// 1.1. .1.. 1.1. .... A4A0
// 1.1. ..1. 1.1. .... A2A0
// 11.. 11.. 11.. .... CCC0
const WORD wMask[5] = { 0xccc0, 0xa2a0, 0xa4a0, 0xa2a0, 0xccc0 };
if( wMask[y] & (1 << (15 - x)) )
{
pBitmap[dwWidth*y + x] |= 0xff808080;
}
}
}
}
pCursorSurface->UnlockRect();
// Set the device cursor
if( FAILED( hr = pd3dDevice->SetCursorProperties( iconinfo.xHotspot,
iconinfo.yHotspot, pCursorSurface ) ) )
{
goto End;
}
hr = S_OK;
End:
if( iconinfo.hbmMask != NULL )
DeleteObject( iconinfo.hbmMask );
if( iconinfo.hbmColor != NULL )
DeleteObject( iconinfo.hbmColor );
if( hdcScreen != NULL )
ReleaseDC( NULL, hdcScreen );
if( hdcColor != NULL )
DeleteDC( hdcColor );
if( hdcMask != NULL )
DeleteDC( hdcMask );
SAFE_DELETE_ARRAY( pcrArrayColor );
SAFE_DELETE_ARRAY( pcrArrayMask );
SAFE_RELEASE( pCursorSurface );
return hr;
}
//-----------------------------------------------------------------------------
// Name: D3DFormatToString
// Desc: Returns the string for the given D3DFORMAT.
//-----------------------------------------------------------------------------
TCHAR* D3DUtil_D3DFormatToString( D3DFORMAT format, bool bWithPrefix )
{
TCHAR* pstr = NULL;
switch( format )
{
case D3DFMT_UNKNOWN: pstr = TEXT("D3DFMT_UNKNOWN"); break;
case D3DFMT_R8G8B8: pstr = TEXT("D3DFMT_R8G8B8"); break;
case D3DFMT_A8R8G8B8: pstr = TEXT("D3DFMT_A8R8G8B8"); break;
case D3DFMT_X8R8G8B8: pstr = TEXT("D3DFMT_X8R8G8B8"); break;
case D3DFMT_R5G6B5: pstr = TEXT("D3DFMT_R5G6B5"); break;
case D3DFMT_X1R5G5B5: pstr = TEXT("D3DFMT_X1R5G5B5"); break;
case D3DFMT_A1R5G5B5: pstr = TEXT("D3DFMT_A1R5G5B5"); break;
case D3DFMT_A4R4G4B4: pstr = TEXT("D3DFMT_A4R4G4B4"); break;
case D3DFMT_R3G3B2: pstr = TEXT("D3DFMT_R3G3B2"); break;
case D3DFMT_A8: pstr = TEXT("D3DFMT_A8"); break;
case D3DFMT_A8R3G3B2: pstr = TEXT("D3DFMT_A8R3G3B2"); break;
case D3DFMT_X4R4G4B4: pstr = TEXT("D3DFMT_X4R4G4B4"); break;
case D3DFMT_A2B10G10R10: pstr = TEXT("D3DFMT_A2B10G10R10"); break;
case D3DFMT_A8B8G8R8: pstr = TEXT("D3DFMT_A8B8G8R8"); break;
case D3DFMT_X8B8G8R8: pstr = TEXT("D3DFMT_X8B8G8R8"); break;
case D3DFMT_G16R16: pstr = TEXT("D3DFMT_G16R16"); break;
case D3DFMT_A2R10G10B10: pstr = TEXT("D3DFMT_A2R10G10B10"); break;
case D3DFMT_A16B16G16R16: pstr = TEXT("D3DFMT_A16B16G16R16"); break;
case D3DFMT_A8P8: pstr = TEXT("D3DFMT_A8P8"); break;
case D3DFMT_P8: pstr = TEXT("D3DFMT_P8"); break;
case D3DFMT_L8: pstr = TEXT("D3DFMT_L8"); break;
case D3DFMT_A8L8: pstr = TEXT("D3DFMT_A8L8"); break;
case D3DFMT_A4L4: pstr = TEXT("D3DFMT_A4L4"); break;
case D3DFMT_V8U8: pstr = TEXT("D3DFMT_V8U8"); break;
case D3DFMT_L6V5U5: pstr = TEXT("D3DFMT_L6V5U5"); break;
case D3DFMT_X8L8V8U8: pstr = TEXT("D3DFMT_X8L8V8U8"); break;
case D3DFMT_Q8W8V8U8: pstr = TEXT("D3DFMT_Q8W8V8U8"); break;
case D3DFMT_V16U16: pstr = TEXT("D3DFMT_V16U16"); break;
case D3DFMT_A2W10V10U10: pstr = TEXT("D3DFMT_A2W10V10U10"); break;
case D3DFMT_UYVY: pstr = TEXT("D3DFMT_UYVY"); break;
case D3DFMT_YUY2: pstr = TEXT("D3DFMT_YUY2"); break;
case D3DFMT_DXT1: pstr = TEXT("D3DFMT_DXT1"); break;
case D3DFMT_DXT2: pstr = TEXT("D3DFMT_DXT2"); break;
case D3DFMT_DXT3: pstr = TEXT("D3DFMT_DXT3"); break;
case D3DFMT_DXT4: pstr = TEXT("D3DFMT_DXT4"); break;
case D3DFMT_DXT5: pstr = TEXT("D3DFMT_DXT5"); break;
case D3DFMT_D16_LOCKABLE: pstr = TEXT("D3DFMT_D16_LOCKABLE"); break;
case D3DFMT_D32: pstr = TEXT("D3DFMT_D32"); break;
case D3DFMT_D15S1: pstr = TEXT("D3DFMT_D15S1"); break;
case D3DFMT_D24S8: pstr = TEXT("D3DFMT_D24S8"); break;
case D3DFMT_D24X8: pstr = TEXT("D3DFMT_D24X8"); break;
case D3DFMT_D24X4S4: pstr = TEXT("D3DFMT_D24X4S4"); break;
case D3DFMT_D16: pstr = TEXT("D3DFMT_D16"); break;
case D3DFMT_L16: pstr = TEXT("D3DFMT_L16"); break;
case D3DFMT_VERTEXDATA: pstr = TEXT("D3DFMT_VERTEXDATA"); break;
case D3DFMT_INDEX16: pstr = TEXT("D3DFMT_INDEX16"); break;
case D3DFMT_INDEX32: pstr = TEXT("D3DFMT_INDEX32"); break;
case D3DFMT_Q16W16V16U16: pstr = TEXT("D3DFMT_Q16W16V16U16"); break;
case D3DFMT_MULTI2_ARGB8: pstr = TEXT("D3DFMT_MULTI2_ARGB8"); break;
case D3DFMT_R16F: pstr = TEXT("D3DFMT_R16F"); break;
case D3DFMT_G16R16F: pstr = TEXT("D3DFMT_G16R16F"); break;
case D3DFMT_A16B16G16R16F: pstr = TEXT("D3DFMT_A16B16G16R16F"); break;
case D3DFMT_R32F: pstr = TEXT("D3DFMT_R32F"); break;
case D3DFMT_G32R32F: pstr = TEXT("D3DFMT_G32R32F"); break;
case D3DFMT_A32B32G32R32F: pstr = TEXT("D3DFMT_A32B32G32R32F"); break;
case D3DFMT_CxV8U8: pstr = TEXT("D3DFMT_CxV8U8"); break;
default: pstr = TEXT("Unknown format"); break;
}
if( bWithPrefix || _tcsstr( pstr, TEXT("D3DFMT_") )== NULL )
return pstr;
else
return pstr + lstrlen( TEXT("D3DFMT_") );
}
//-----------------------------------------------------------------------------
// Name: D3DXQuaternionUnitAxisToUnitAxis2
// Desc: Axis to axis quaternion double angle (no normalization)
// Takes two points on unit sphere an angle THETA apart, returns
// quaternion that represents a rotation around cross product by 2*THETA.
//-----------------------------------------------------------------------------
inline D3DXQUATERNION* WINAPI D3DXQuaternionUnitAxisToUnitAxis2
( D3DXQUATERNION *pOut, const D3DXVECTOR3 *pvFrom, const D3DXVECTOR3 *pvTo)
{
D3DXVECTOR3 vAxis;
D3DXVec3Cross(&vAxis, pvFrom, pvTo); // proportional to sin(theta)
pOut->x = vAxis.x;
pOut->y = vAxis.y;
pOut->z = vAxis.z;
pOut->w = D3DXVec3Dot( pvFrom, pvTo );
return pOut;
}
//-----------------------------------------------------------------------------
// Name: D3DXQuaternionAxisToAxis
// Desc: Axis to axis quaternion
// Takes two points on unit sphere an angle THETA apart, returns
// quaternion that represents a rotation around cross product by theta.
//-----------------------------------------------------------------------------
inline D3DXQUATERNION* WINAPI D3DXQuaternionAxisToAxis
( D3DXQUATERNION *pOut, const D3DXVECTOR3 *pvFrom, const D3DXVECTOR3 *pvTo)
{
D3DXVECTOR3 vA, vB;
D3DXVec3Normalize(&vA, pvFrom);
D3DXVec3Normalize(&vB, pvTo);
D3DXVECTOR3 vHalf(vA + vB);
D3DXVec3Normalize(&vHalf, &vHalf);
return D3DXQuaternionUnitAxisToUnitAxis2(pOut, &vA, &vHalf);
}
//-----------------------------------------------------------------------------
// Name:
// Desc:
//-----------------------------------------------------------------------------
CD3DArcBall::CD3DArcBall()
{
Init();
}
//-----------------------------------------------------------------------------
// Name:
// Desc:
//-----------------------------------------------------------------------------
void CD3DArcBall::Init()
{
D3DXQuaternionIdentity( &m_qDown );
D3DXQuaternionIdentity( &m_qNow );
D3DXMatrixIdentity( &m_matRotation );
D3DXMatrixIdentity( &m_matRotationDelta );
D3DXMatrixIdentity( &m_matTranslation );
D3DXMatrixIdentity( &m_matTranslationDelta );
m_bDrag = FALSE;
m_fRadiusTranslation = 1.0f;
m_bRightHanded = FALSE;
}
//-----------------------------------------------------------------------------
// Name:
// Desc:
//-----------------------------------------------------------------------------
VOID CD3DArcBall::SetWindow( int iWidth, int iHeight, float fRadius )
{
// Set ArcBall info
m_iWidth = iWidth;
m_iHeight = iHeight;
m_fRadius = fRadius;
}
//-----------------------------------------------------------------------------
// Name:
// Desc:
//-----------------------------------------------------------------------------
D3DXVECTOR3 CD3DArcBall::ScreenToVector( int sx, int sy )
{
// Scale to screen
FLOAT x = -(sx - m_iWidth/2) / (m_fRadius*m_iWidth/2);
FLOAT y = (sy - m_iHeight/2) / (m_fRadius*m_iHeight/2);
if( m_bRightHanded )
{
x = -x;
y = -y;
}
FLOAT z = 0.0f;
FLOAT mag = x*x + y*y;
if( mag > 1.0f )
{
FLOAT scale = 1.0f/sqrtf(mag);
x *= scale;
y *= scale;
}
else
z = sqrtf( 1.0f - mag );
// Return vector
return D3DXVECTOR3( x, y, z );
}
//-----------------------------------------------------------------------------
// Name:
// Desc:
//-----------------------------------------------------------------------------
VOID CD3DArcBall::SetRadius( FLOAT fRadius )
{
m_fRadiusTranslation = fRadius;
}
//-----------------------------------------------------------------------------
// Name:
// Desc:
//-----------------------------------------------------------------------------
LRESULT CD3DArcBall::HandleMouseMessages( HWND hWnd, UINT uMsg, WPARAM wParam,
LPARAM lParam )
{
static int iCurMouseX; // Saved mouse position
static int iCurMouseY;
static D3DXVECTOR3 s_vDown; // Button down vector
// Current mouse position
int iMouseX = GET_X_LPARAM(lParam);
int iMouseY = GET_Y_LPARAM(lParam);
switch( uMsg )
{
case WM_RBUTTONDOWN:
case WM_MBUTTONDOWN:
// Store off the position of the cursor when the button is pressed
iCurMouseX = iMouseX;
iCurMouseY = iMouseY;
return TRUE;
case WM_LBUTTONDOWN:
// Start drag mode
m_bDrag = TRUE;
s_vDown = ScreenToVector( iMouseX, iMouseY );
m_qDown = m_qNow;
return TRUE;
case WM_LBUTTONUP:
// End drag mode
m_bDrag = FALSE;
return TRUE;
case WM_MOUSEMOVE:
// Drag object
if( MK_LBUTTON&wParam )
{
if( m_bDrag )
{
// recompute m_qNow
D3DXVECTOR3 vCur = ScreenToVector( iMouseX, iMouseY );
D3DXQUATERNION qAxisToAxis;
D3DXQuaternionAxisToAxis(&qAxisToAxis, &s_vDown, &vCur);
m_qNow = m_qDown;
m_qNow *= qAxisToAxis;
D3DXMatrixRotationQuaternion(&m_matRotationDelta, &qAxisToAxis);
}
else
D3DXMatrixIdentity(&m_matRotationDelta);
D3DXMatrixRotationQuaternion(&m_matRotation, &m_qNow);
m_bDrag = TRUE;
}
else if( (MK_RBUTTON&wParam) || (MK_MBUTTON&wParam) )
{
// Normalize based on size of window and bounding sphere radius
FLOAT fDeltaX = ( iCurMouseX-iMouseX ) * m_fRadiusTranslation / m_iWidth;
FLOAT fDeltaY = ( iCurMouseY-iMouseY ) * m_fRadiusTranslation / m_iHeight;
if( wParam & MK_RBUTTON )
{
D3DXMatrixTranslation( &m_matTranslationDelta, -2*fDeltaX, 2*fDeltaY, 0.0f );
D3DXMatrixMultiply( &m_matTranslation, &m_matTranslation, &m_matTranslationDelta );
}
else // wParam & MK_MBUTTON
{
D3DXMatrixTranslation( &m_matTranslationDelta, 0.0f, 0.0f, 5*fDeltaY );
D3DXMatrixMultiply( &m_matTranslation, &m_matTranslation, &m_matTranslationDelta );
}
// Store mouse coordinate
iCurMouseX = iMouseX;
iCurMouseY = iMouseY;
}
return TRUE;
}
return FALSE;
}
//-----------------------------------------------------------------------------
// Name:
// Desc:
//-----------------------------------------------------------------------------
CD3DCamera::CD3DCamera()
{
// Set attributes for the view matrix
D3DXVECTOR3 vEyePt(0.0f,0.0f,0.0f);
D3DXVECTOR3 vLookatPt(0.0f,0.0f,1.0f);
D3DXVECTOR3 vUpVec(0.0f,1.0f,0.0f);
SetViewParams( vEyePt, vLookatPt, vUpVec );
// Set attributes for the projection matrix
SetProjParams( D3DX_PI/4, 1.0f, 1.0f, 1000.0f );
}
//-----------------------------------------------------------------------------
// Name:
// Desc:
//-----------------------------------------------------------------------------
VOID CD3DCamera::SetViewParams( D3DXVECTOR3 &vEyePt, D3DXVECTOR3& vLookatPt,
D3DXVECTOR3& vUpVec )
{
// Set attributes for the view matrix
m_vEyePt = vEyePt;
m_vLookatPt = vLookatPt;
m_vUpVec = vUpVec;
D3DXVECTOR3 vDir = m_vLookatPt - m_vEyePt;
D3DXVec3Normalize( &m_vView, &vDir );
D3DXVec3Cross( &m_vCross, &m_vView, &m_vUpVec );
D3DXMatrixLookAtLH( &m_matView, &m_vEyePt, &m_vLookatPt, &m_vUpVec );
D3DXMatrixInverse( &m_matBillboard, NULL, &m_matView );
m_matBillboard._41 = 0.0f;
m_matBillboard._42 = 0.0f;
m_matBillboard._43 = 0.0f;
}
//-----------------------------------------------------------------------------
// Name:
// Desc:
//-----------------------------------------------------------------------------
VOID CD3DCamera::SetProjParams( FLOAT fFOV, FLOAT fAspect, FLOAT fNearPlane,
FLOAT fFarPlane )
{
// Set attributes for the projection matrix
m_fFOV = fFOV;
m_fAspect = fAspect;
m_fNearPlane = fNearPlane;
m_fFarPlane = fFarPlane;
D3DXMatrixPerspectiveFovLH( &m_matProj, fFOV, fAspect, fNearPlane, fFarPlane );
}