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- //-----------------------------------------------------------------------------
- // File: D3DUtil.cpp
- //
- // Desc: Shortcut macros and functions for using DX objects
- //
- // Copyright (c) 2000-2001 Microsoft Corporation. All rights reserved
- //-----------------------------------------------------------------------------
- #include <streams.h>
-
- #define D3D_OVERLOADS
- #include <math.h>
- #include "D3DUtil.h"
-
- #ifndef _T
- #define _T TEXT
- #endif
-
- //-----------------------------------------------------------------------------
- // Name: D3DUtil_GetDXSDKMediaPath()
- // Desc: Returns the DirectX SDK media path, as stored in the system registry
- // during the SDK install.
- //-----------------------------------------------------------------------------
- const TCHAR* D3DUtil_GetDXSDKMediaPath()
- {
- static TCHAR strNull[2] = _T("");
- static TCHAR strPath[512];
- HKEY key;
- DWORD type, size = 512;
-
- // Open the appropriate registry key
- LONG result = RegOpenKeyEx( HKEY_LOCAL_MACHINE,
- _T("Software\\Microsoft\\DirectX"),
- 0, KEY_READ, &key );
- if( ERROR_SUCCESS != result )
- return strNull;
-
- result = RegQueryValueEx( key, _T("DX81SDK Samples Path"), NULL,
- &type, (BYTE*)strPath, &size );
- RegCloseKey( key );
-
- if( ERROR_SUCCESS != result )
- {
- result = RegQueryValueEx( key, _T("DX8SDK Samples Path"), NULL,
- &type, (BYTE*)strPath, &size );
- RegCloseKey( key );
-
- if( ERROR_SUCCESS != result )
- {
- result = RegQueryValueEx( key, _T("DXSDK Samples Path"), NULL,
- &type, (BYTE*)strPath, &size );
- RegCloseKey( key );
-
- if( ERROR_SUCCESS != result )
- return strNull;
- }
- }
-
- lstrcat( strPath, _T("\\D3DIM\\Media\\") );
-
- return strPath;
- }
-
-
- //-----------------------------------------------------------------------------
- // Name: D3DUtil_InitSurfaceDesc()
- // Desc: Helper function called to build a DDSURFACEDESC2 structure,
- // typically before calling CreateSurface() or GetSurfaceDesc()
- //-----------------------------------------------------------------------------
- VOID D3DUtil_InitSurfaceDesc( DDSURFACEDESC2& ddsd, DWORD dwFlags,
- DWORD dwCaps )
- {
- ZeroMemory( &ddsd, sizeof(ddsd) );
- ddsd.dwSize = sizeof(ddsd);
- ddsd.dwFlags = dwFlags;
- ddsd.ddsCaps.dwCaps = dwCaps;
- ddsd.ddpfPixelFormat.dwSize = sizeof(DDPIXELFORMAT);
- }
-
-
- //-----------------------------------------------------------------------------
- // Name: D3DUtil_InitMaterial()
- // Desc: Helper function called to build a D3DMATERIAL7 structure
- //-----------------------------------------------------------------------------
- VOID D3DUtil_InitMaterial( D3DMATERIAL7& mtrl, FLOAT r, FLOAT g, FLOAT b,
- FLOAT a )
- {
- ZeroMemory( &mtrl, sizeof(D3DMATERIAL7) );
- mtrl.dcvDiffuse.r = mtrl.dcvAmbient.r = r;
- mtrl.dcvDiffuse.g = mtrl.dcvAmbient.g = g;
- mtrl.dcvDiffuse.b = mtrl.dcvAmbient.b = b;
- mtrl.dcvDiffuse.a = mtrl.dcvAmbient.a = a;
- }
-
-
- //-----------------------------------------------------------------------------
- // Name: D3DUtil_InitLight()
- // Desc: Initializes a D3DLIGHT7 structure
- //-----------------------------------------------------------------------------
- VOID D3DUtil_InitLight( D3DLIGHT7& light, D3DLIGHTTYPE ltType,
- FLOAT x, FLOAT y, FLOAT z )
- {
- ZeroMemory( &light, sizeof(D3DLIGHT7) );
- light.dltType = ltType;
- light.dcvDiffuse.r = 1.0f;
- light.dcvDiffuse.g = 1.0f;
- light.dcvDiffuse.b = 1.0f;
- light.dcvSpecular = light.dcvDiffuse;
- light.dvPosition.x = light.dvDirection.x = x;
- light.dvPosition.y = light.dvDirection.y = y;
- light.dvPosition.z = light.dvDirection.z = z;
- light.dvAttenuation0 = 1.0f;
- light.dvRange = D3DLIGHT_RANGE_MAX;
- }
-
-
- //-----------------------------------------------------------------------------
- // Name: D3DUtil_SetViewMatrix()
- // Desc: Given an eye point, a lookat point, and an up vector, this
- // function builds a 4x4 view matrix.
- //-----------------------------------------------------------------------------
- HRESULT D3DUtil_SetViewMatrix( D3DMATRIX& mat, D3DVECTOR& vFrom,
- D3DVECTOR& vAt, D3DVECTOR& vWorldUp )
- {
- // Get the z basis vector, which points straight ahead. This is the
- // difference from the eyepoint to the lookat point.
- D3DVECTOR vView = vAt - vFrom;
-
- FLOAT fLength = Magnitude( vView );
- if( fLength < 1e-6f )
- return E_INVALIDARG;
-
- // Normalize the z basis vector
- vView /= fLength;
-
- // Get the dot product, and calculate the projection of the z basis
- // vector onto the up vector. The projection is the y basis vector.
- FLOAT fDotProduct = DotProduct( vWorldUp, vView );
-
- D3DVECTOR vUp = vWorldUp - fDotProduct * vView;
-
- // If this vector has near-zero length because the input specified a
- // bogus up vector, let's try a default up vector
- if( 1e-6f > ( fLength = Magnitude( vUp ) ) )
- {
- vUp = D3DVECTOR( 0.0f, 1.0f, 0.0f ) - vView.y * vView;
-
- // If we still have near-zero length, resort to a different axis.
- if( 1e-6f > ( fLength = Magnitude( vUp ) ) )
- {
- vUp = D3DVECTOR( 0.0f, 0.0f, 1.0f ) - vView.z * vView;
-
- if( 1e-6f > ( fLength = Magnitude( vUp ) ) )
- return E_INVALIDARG;
- }
- }
-
- // Normalize the y basis vector
- vUp /= fLength;
-
- // The x basis vector is found simply with the cross product of the y
- // and z basis vectors
- D3DVECTOR vRight = CrossProduct( vUp, vView );
-
- // Start building the matrix. The first three rows contains the basis
- // vectors used to rotate the view to point at the lookat point
- D3DUtil_SetIdentityMatrix( mat );
- mat._11 = vRight.x; mat._12 = vUp.x; mat._13 = vView.x;
- mat._21 = vRight.y; mat._22 = vUp.y; mat._23 = vView.y;
- mat._31 = vRight.z; mat._32 = vUp.z; mat._33 = vView.z;
-
- // Do the translation values (rotations are still about the eyepoint)
- mat._41 = - DotProduct( vFrom, vRight );
- mat._42 = - DotProduct( vFrom, vUp );
- mat._43 = - DotProduct( vFrom, vView );
-
- return S_OK;
- }
-
-
- //-----------------------------------------------------------------------------
- // Name: D3DUtil_SetProjectionMatrix()
- // Desc: Sets the passed in 4x4 matrix to a perpsective projection matrix built
- // from the field-of-view (fov, in y), aspect ratio, near plane (D),
- // and far plane (F). Note that the projection matrix is normalized for
- // element [3][4] to be 1.0. This is performed so that W-based range fog
- // will work correctly.
- //-----------------------------------------------------------------------------
- HRESULT D3DUtil_SetProjectionMatrix( D3DMATRIX& mat, FLOAT fFOV, FLOAT fAspect,
- FLOAT fNearPlane, FLOAT fFarPlane )
- {
- if( fabs(fFarPlane-fNearPlane) < 0.01f )
- return E_INVALIDARG;
- if( fabs(sin(fFOV/2)) < 0.01f )
- return E_INVALIDARG;
-
- FLOAT w = fAspect * ( cosf(fFOV/2)/sinf(fFOV/2) );
- FLOAT h = 1.0f * ( cosf(fFOV/2)/sinf(fFOV/2) );
- FLOAT Q = fFarPlane / ( fFarPlane - fNearPlane );
-
- ZeroMemory( &mat, sizeof(D3DMATRIX) );
- mat._11 = w;
- mat._22 = h;
- mat._33 = Q;
- mat._34 = 1.0f;
- mat._43 = -Q*fNearPlane;
-
- return S_OK;
- }
-
-
- //-----------------------------------------------------------------------------
- // Name: D3DUtil_SetRotateXMatrix()
- // Desc: Create Rotation matrix about X axis
- //-----------------------------------------------------------------------------
- VOID D3DUtil_SetRotateXMatrix( D3DMATRIX& mat, FLOAT fRads )
- {
- D3DUtil_SetIdentityMatrix( mat );
- mat._22 = cosf( fRads );
- mat._23 = sinf( fRads );
- mat._32 = -sinf( fRads );
- mat._33 = cosf( fRads );
- }
-
-
- //-----------------------------------------------------------------------------
- // Name: D3DUtil_SetRotateYMatrix()
- // Desc: Create Rotation matrix about Y axis
- //-----------------------------------------------------------------------------
- VOID D3DUtil_SetRotateYMatrix( D3DMATRIX& mat, FLOAT fRads )
- {
- D3DUtil_SetIdentityMatrix( mat );
- mat._11 = cosf( fRads );
- mat._13 = -sinf( fRads );
- mat._31 = sinf( fRads );
- mat._33 = cosf( fRads );
- }
-
-
- //-----------------------------------------------------------------------------
- // Name: D3DUtil_SetRotateZMatrix()
- // Desc: Create Rotation matrix about Z axis
- //-----------------------------------------------------------------------------
- VOID D3DUtil_SetRotateZMatrix( D3DMATRIX& mat, FLOAT fRads )
- {
- D3DUtil_SetIdentityMatrix( mat );
- mat._11 = cosf( fRads );
- mat._12 = sinf( fRads );
- mat._21 = -sinf( fRads );
- mat._22 = cosf( fRads );
- }
-
-
- //-----------------------------------------------------------------------------
- // Name: D3DUtil_SetRotationMatrix
- // Desc: Create a Rotation matrix about vector direction
- //-----------------------------------------------------------------------------
- VOID D3DUtil_SetRotationMatrix( D3DMATRIX& mat, D3DVECTOR& vDir, FLOAT fRads )
- {
- FLOAT fCos = cosf( fRads );
- FLOAT fSin = sinf( fRads );
- D3DVECTOR v = Normalize( vDir );
-
- mat._11 = ( v.x * v.x ) * ( 1.0f - fCos ) + fCos;
- mat._12 = ( v.x * v.y ) * ( 1.0f - fCos ) - (v.z * fSin);
- mat._13 = ( v.x * v.z ) * ( 1.0f - fCos ) + (v.y * fSin);
-
- mat._21 = ( v.y * v.x ) * ( 1.0f - fCos ) + (v.z * fSin);
- mat._22 = ( v.y * v.y ) * ( 1.0f - fCos ) + fCos ;
- mat._23 = ( v.y * v.z ) * ( 1.0f - fCos ) - (v.x * fSin);
-
- mat._31 = ( v.z * v.x ) * ( 1.0f - fCos ) - (v.y * fSin);
- mat._32 = ( v.z * v.y ) * ( 1.0f - fCos ) + (v.x * fSin);
- mat._33 = ( v.z * v.z ) * ( 1.0f - fCos ) + fCos;
-
- mat._14 = mat._24 = mat._34 = 0.0f;
- mat._41 = mat._42 = mat._43 = 0.0f;
- mat._44 = 1.0f;
- }
-
-
- //-----------------------------------------------------------------------------
- // Name: _DbgOut()
- // Desc: Outputs a message to the debug stream
- //-----------------------------------------------------------------------------
- HRESULT _DbgOut( CHAR* strFile, DWORD dwLine, HRESULT hr, TCHAR* strMsg )
- {
- TCHAR buffer[256];
- wsprintf( buffer, _T("%hs(%ld): "), strFile, dwLine );
- OutputDebugString( buffer );
- OutputDebugString( strMsg );
-
- if( hr )
- {
- wsprintf( buffer, _T("(hr=%08lx)\n"), hr );
- OutputDebugString( buffer );
- }
-
- OutputDebugString( _T("\n") );
-
- return hr;
- }
-
-