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DXUT源码分析 ---- 媒体文件查找函数

DXUT中涉及到媒体文件查找的函数有3个:DXUTFindMediaSearchTypicalDirs()、DXUTFindMediaSearchParentDirs()、DXUTFindDXSDKMediaFileCch(),都位于DXUTmisc.cpp文件中。

 

DXUTFindMediaSearchTypicalDirs()分析:

DXUTFindMediaSearchTypicalDirs()这个函数用于在特定的搜索路径中查找媒体文件,主要供DXUTFindDXSDKMediaFileCch()调用以查找媒体文件。

参数分析:

strSearchPath: 函数调用完后将媒体文件的路径返回给该字符串(可能是当前工作目录路径,也可能是全路径)
cchSearch: strSearchPath的长度
strLeaf:指定要查找的媒体文件名
strExePath:当前进程执行文件所在的目录(全路径名)
strExeName:当前进程执行文件名(不包含扩展名)

//--------------------------------------------------------------------------------------
// Search a set of typical directories
//--------------------------------------------------------------------------------------
bool DXUTFindMediaSearchTypicalDirs( WCHAR* strSearchPath, int cchSearch, LPCWSTR strLeaf,
WCHAR* strExePath, WCHAR* strExeName )
{
// Typical directories:
// .\
// ..\
// ..\..\
// %EXE_DIR%\
// %EXE_DIR%\..\
// %EXE_DIR%\..\..\
// %EXE_DIR%\..\%EXE_NAME%
// %EXE_DIR%\..\..\%EXE_NAME%
// DXSDK media path
    // Search in .\  
StringCchCopy( strSearchPath, cchSearch, strLeaf );
if( GetFileAttributes( strSearchPath ) != 0xFFFFFFFF )
return true;
    // Search in ..\  
StringCchPrintf( strSearchPath, cchSearch, L"..\\%s", strLeaf );
if( GetFileAttributes( strSearchPath ) != 0xFFFFFFFF )
return true;
    // Search in ..\..\ 
StringCchPrintf( strSearchPath, cchSearch, L"..\\..\\%s", strLeaf );
if( GetFileAttributes( strSearchPath ) != 0xFFFFFFFF )
return true;
    // Search in the %EXE_DIR%\ 
StringCchPrintf( strSearchPath, cchSearch, L"%s\\%s", strExePath, strLeaf );
if( GetFileAttributes( strSearchPath ) != 0xFFFFFFFF )
return true;
    // Search in the %EXE_DIR%\..\ 
StringCchPrintf( strSearchPath, cchSearch, L"%s\\..\\%s", strExePath, strLeaf );
if( GetFileAttributes( strSearchPath ) != 0xFFFFFFFF )
return true;
    // Search in the %EXE_DIR%\..\..\ 
StringCchPrintf( strSearchPath, cchSearch, L"%s\\..\\..\\%s", strExePath, strLeaf );
if( GetFileAttributes( strSearchPath ) != 0xFFFFFFFF )
return true;
    // Search in "%EXE_DIR%\..\%EXE_NAME%\".  This matches the DirectX SDK layout
StringCchPrintf( strSearchPath, cchSearch, L"%s\\..\\%s\\%s", strExePath, strExeName, strLeaf );
if( GetFileAttributes( strSearchPath ) != 0xFFFFFFFF )
return true;
    // Search in "%EXE_DIR%\..\..\%EXE_NAME%\".  This matches the DirectX SDK layout
StringCchPrintf( strSearchPath, cchSearch, L"%s\\..\\..\\%s\\%s", strExePath, strExeName, strLeaf );
if( GetFileAttributes( strSearchPath ) != 0xFFFFFFFF )
return true;
    // Search in media search dir 
    WCHAR* s_strSearchPath = DXUTMediaSearchPath();
    if( s_strSearchPath[0] != 0 )
{
StringCchPrintf( strSearchPath, cchSearch, L"%s%s", s_strSearchPath, strLeaf );
        if( GetFileAttributes( strSearchPath ) != 0xFFFFFFFF )
return true;
}
    return false;
}

函数首先在当前工作目录(.\)查找,它首先调用

StringCchCopy( strSearchPath, cchSearch, strLeaf );

将要查找的媒体文件名复制到字符串strSearchPath中,该函数声明如下:

StringCchCopy is a replacement for strcpy. The size, in characters, of the destination buffer is provided to the function to ensure that StringCchCopy does not write past the end of this buffer.

Syntax

HRESULT StringCchCopy(      

    LPTSTR pszDest,
    size_t cchDest,
    LPCTSTR pszSrc
);

Parameters

pszDest
[out] Pointer to a buffer which receives the copied string.
cchDest
[in] Size of the destination buffer, in characters. This value must equal the length of pszSrc plus 1 to account for the copied source string and the terminating null character. The maximum number of characters allowed is STRSAFE_MAX_CCH.
pszSrc
[in] Pointer to a buffer containing the source string. This source string must be null-terminated.

Return Value

Note that this function returns an HRESULT as opposed to strcpy, which returns a pointer. It is strongly recommended that you use the SUCCEEDED and FAILED macros to test the return value of this function.

S_OK Source data was present, fully copied without truncation, and the resultant destination buffer is null-terminated.
STRSAFE_E_INVALID_PARAMETER The value in cchDest is either 0 or larger than STRSAFE_MAX_CCH.
STRSAFE_E_INSUFFICIENT_BUFFER The copy operation failed due to insufficient buffer space. The destination buffer contains a truncated, null-terminated version of the intended result. In situations where truncation is acceptable, this may not necessarily be seen as a failure condition.

Remarks

StringCchCopy provides additional processing for proper buffer handling in your code. Poor buffer handling is implicated in many security issues that involve buffer overruns. StringCchCopy always null-terminates a non-zero-length destination buffer.

StringCchCopy can be used in its generic form, or specifically as StringCchCopyA (for ANSI strings) or StringCchCopyW (for Unicode strings). The form to use is determined by your data.

String Data Type String Literal Function
char "string" StringCchCopyA
TCHAR TEXT("string") StringCchCopy
WCHAR L"string" StringCchCopyW
 

接着调用

if( GetFileAttributes( strSearchPath ) != 0xFFFFFFFF )
        return true;

判断要查找的媒体文件是否存在,该函数声明如下:

The GetFileAttributes function retrieves a set of FAT file system attributes for a specified file or directory.

To get more attribute information, use the GetFileAttributesEx function.

DWORD GetFileAttributes(
LPCTSTR lpFileName
);

Parameters

lpFileName
[in] A pointer to a null-terminated string that specifies the name of a file or directory.

In the ANSI version of this function, the name is limited to MAX_PATH characters. To extend this limit to 32,767 wide characters, call the Unicode version of the function and prepend "\\?\" to the path. For more information, see Naming a File.

Windows Me/98/95:  This string must not exceed MAX_PATH characters.

Return Values

If the function succeeds, the return value contains the attributes of the specified file or directory.

If the function fails, the return value is INVALID_FILE_ATTRIBUTES. To get extended error information, call GetLastError.

The attributes can be one or more of the following values.

Attribute Meaning
FILE_ATTRIBUTE_ARCHIVE A file or directory that is an archive file or directory.

Applications use this attribute to mark files for backup or removal.

FILE_ATTRIBUTE_COMPRESSED A file or directory that is compressed.

For a file, all of the data in the file is compressed.

For a directory, compression is the default for newly created files and subdirectories.

FILE_ATTRIBUTE_DEVICE Reserved; do not use.
FILE_ATTRIBUTE_DIRECTORY The handle that identifies a directory.
FILE_ATTRIBUTE_ENCRYPTED A file or directory that is encrypted.

For a file, all data streams in the file are encrypted.

For a directory, encryption is the default for newly created files and subdirectories.

FILE_ATTRIBUTE_HIDDEN The file or directory is hidden. It is not included in an ordinary directory listing.
FILE_ATTRIBUTE_NORMAL A file or directory that does not have other attributes set.

This attribute is valid only when used alone.

FILE_ATTRIBUTE_NOT_CONTENT_INDEXED The file is not be indexed by the content indexing service.
FILE_ATTRIBUTE_OFFLINE The data of a file is not available immediately.

This attribute indicates that the file data is physically moved to offline storage. This attribute is used by Remote Storage, which is the hierarchical storage management software. Applications should not arbitrarily change this attribute.

FILE_ATTRIBUTE_READONLY A file or directory that is read-only.

For a file, applications can read the file, but cannot write to it or delete it.

For a directory, applications cannot delete it.

FILE_ATTRIBUTE_REPARSE_POINT A file or directory that has an associated reparse point.
FILE_ATTRIBUTE_SPARSE_FILE A file that is a sparse file.
FILE_ATTRIBUTE_SYSTEM A file or directory that the operating system uses a part of, or uses exclusively.
FILE_ATTRIBUTE_TEMPORARY A file that is being used for temporary storage.

File systems avoid writing data back to mass storage if sufficient cache memory is available, because typically, an application deletes a temporary file after the handle is closed. In that scenario, the system can entirely avoid writing the data. Otherwise, the data is written after the handle is closed.

Remarks

When GetFileAttributes is called on a directory that contains a volume mount point, the file attributes returned are those of the directory where the volume mount point is set, not those of the root directory in a target mounted volume. To obtain the file attributes of a mounted volume, call GetVolumeNameForVolumeMountPoint to obtain the name of the target volume. Then use the resulting name in a call to GetFileAttributes. The results are the attributes of the root directory on the target volume.

接着按以下路径搜索媒体文件:

    //      ..\
    //      ..\..\
    //      %EXE_DIR%\
    //      %EXE_DIR%\..\
    //      %EXE_DIR%\..\..\
    //      %EXE_DIR%\..\%EXE_NAME%
    //      %EXE_DIR%\..\..\%EXE_NAME%

最后在DirectX SDK媒体文件目录中搜索媒体文件,当然该目录必须首先在程序中设置才会被搜索:

    // Search in media search dir 
    WCHAR* s_strSearchPath = DXUTMediaSearchPath();
    if( s_strSearchPath[0] != 0 )
{
StringCchPrintf( strSearchPath, cchSearch, L"%s%s", s_strSearchPath, strLeaf );
        if( GetFileAttributes( strSearchPath ) != 0xFFFFFFFF )
return true;
}

函数DXUTMediaSearchPath()返回设置的媒体文件搜索路径:

//--------------------------------------------------------------------------------------
// Returns pointer to static media search buffer
//--------------------------------------------------------------------------------------
WCHAR* DXUTMediaSearchPath()
{
static WCHAR s_strMediaSearchPath[MAX_PATH] = {0};
return s_strMediaSearchPath;
}

 

DXUTFindMediaSearchParentDirs()分析

DXUTFindMediaSearchParentDirs()用于在指定搜索路径的父目录中查找媒体文件,主要供DXUTFindDXSDKMediaFileCch()调用。

参数分析:

strSearchPath:当找到媒体文件时,将媒体文件的全路径名返回给这个字符串。
cchSearch:strSearchPath的长度
strStartAt:指定开始搜索的路径
strLeafName:媒体文件名(包含扩展名)

//--------------------------------------------------------------------------------------
// Search parent directories starting at strStartAt, and appending strLeafName
// at each parent directory. It stops at the root directory.
//--------------------------------------------------------------------------------------
bool DXUTFindMediaSearchParentDirs( WCHAR* strSearchPath, int cchSearch, WCHAR* strStartAt, WCHAR* strLeafName )
{
WCHAR strFullPath[MAX_PATH] = {0};
WCHAR strFullFileName[MAX_PATH] = {0};
WCHAR strSearch[MAX_PATH] = {0};
WCHAR* strFilePart = NULL;
    GetFullPathName( strStartAt, MAX_PATH, strFullPath, &strFilePart );
if( strFilePart == NULL )
return false;
    while( strFilePart != NULL && *strFilePart != '\0' )
{
StringCchPrintf( strFullFileName, MAX_PATH, L"%s\\%s", strFullPath, strLeafName );

if( GetFileAttributes( strFullFileName ) != 0xFFFFFFFF )
{
StringCchCopy( strSearchPath, cchSearch, strFullFileName );
return true;
}
        StringCchPrintf( strSearch, MAX_PATH, L"%s\\..", strFullPath ); 
GetFullPathName( strSearch, MAX_PATH, strFullPath, &strFilePart );
}
    return false;
}

函数首先调用

    GetFullPathName( strStartAt, MAX_PATH, strFullPath, &strFilePart );
    if( strFilePart == NULL )
        return false;

获取开始搜索的路径全名和文件名,注意如果strStartAt指定的是一个目录,则strFillPart返回的是最后一个目录的名称,而不是文件名。

该函数声明如下:

The GetFullPathName function retrieves the full path and file name of a specified file.
DWORD GetFullPathName(
LPCTSTR lpFileName,
DWORD nBufferLength,
LPTSTR lpBuffer,
LPTSTR* lpFilePart
);

Parameters

lpFileName
[in] A pointer to a null-terminated string that specifies a valid file name.

This string can use short (the 8.3 form) or long file names.

nBufferLength
[in] The size of the buffer to receive the null-terminated string for the drive and path, in TCHARs.
lpBuffer
[out] A pointer to a buffer that receives the null-terminated string for the drive and path.
lpFilePart
[out] A pointer to a buffer that receives the address (in lpBuffer) of the final file name component in the path.

If lpBuffer points to a directory and not a file, lpFilePart receives 0 (zero).

Return Values

If the function succeeds, the return value is the length of the string copied to lpBuffer, not including the terminating null character, in TCHARs.

If the lpBuffer buffer is too small to contain the path, the return value is the size of the buffer that is required to hold the path and the terminating null character, in TCHARs. Therefore, if the return value is greater than nBufferLength, call the function again with a buffer that is large enough to hold the path.

If the function fails for any other reason, the return value is 0 (zero). To get extended error information, call GetLastError.

Remarks

GetFullPathName merges the name of the current drive and directory with a specified file name to determine the full path and file name of the specified file. It also calculates the address of the file name portion of the full path and file name. This function does not verify that the resulting path and file name are valid, or that they see an existing file on the associated volume.

GetFullPathName does not convert the specified file name, lpFileName. If the specified file name exists, you can use GetLongPathName and GetShortPathName to convert to long and short path names, respectively.

函数接着不断的上溯目录层查找直到到达分区的根目录为止,如果找到就将strSearchPath置为媒体文件所在的路径全名,并返回true,否则返回false。

    while( strFilePart != NULL && *strFilePart != '\0' )
{
StringCchPrintf( strFullFileName, MAX_PATH, L"%s\\%s", strFullPath, strLeafName );

if( GetFileAttributes( strFullFileName ) != 0xFFFFFFFF )
{
StringCchCopy( strSearchPath, cchSearch, strFullFileName );
return true;
}
        StringCchPrintf( strSearch, MAX_PATH, L"%s\\..", strFullPath ); 
GetFullPathName( strSearch, MAX_PATH, strFullPath, &strFilePart );
}

 

DXUTFindDXSDKMediaFileCch()分析

该函数主要用于查找媒体文件。

参数分析:

strDestPath:函数调用成功后将返回媒体文件的全路径名(若在当前工作目录找到该文件则仅返回媒体文件名),若调用失败则返回媒体文件名。

cchDest:strDestPath的长度。

strFilename:要查找的媒体文件名。

//--------------------------------------------------------------------------------------
// Tries to find the location of a SDK media file.
//
// cchDest is the size in WCHARs of strDestPath.
// Be careful not to pass in sizeof(strDest) on UNICODE builds.
//--------------------------------------------------------------------------------------
HRESULT DXUTFindDXSDKMediaFileCch( WCHAR* strDestPath, int cchDest, LPCWSTR strFilename )
{
bool bFound;
WCHAR strSearchFor[MAX_PATH];
    if( NULL==strFilename || strFilename[0] == 0 || NULL==strDestPath || cchDest < 10 )
return E_INVALIDARG;
    // Get the exe name, and exe path
    WCHAR strExePath[MAX_PATH] = {0};
WCHAR strExeName[MAX_PATH] = {0};
WCHAR* strLastSlash = NULL;
    GetModuleFileName(NULL, strExePath, MAX_PATH);
strExePath[MAX_PATH-1] = 0;
    strLastSlash = wcsrchr( strExePath, TEXT('\\') );
    if( strLastSlash )
{
StringCchCopy( strExeName, MAX_PATH, &strLastSlash[1] );
        // Chop the exe name from the exe path
*strLastSlash = 0;
        // Chop the .exe from the exe name
strLastSlash = wcsrchr( strExeName, TEXT('.') );
if( strLastSlash )
*strLastSlash = 0;
}
    // Typical directories:
// .\
// ..\
// ..\..\
// %EXE_DIR%\
// %EXE_DIR%\..\
// %EXE_DIR%\..\..\
// %EXE_DIR%\..\%EXE_NAME%
// %EXE_DIR%\..\..\%EXE_NAME%
    // Typical directory search
bFound = DXUTFindMediaSearchTypicalDirs( strDestPath, cchDest, strFilename, strExePath, strExeName );
if( bFound )
return S_OK;
    // Typical directory search again, but also look in a subdir called "\media\" 
StringCchPrintf( strSearchFor, MAX_PATH, L"media\\%s", strFilename );
bFound = DXUTFindMediaSearchTypicalDirs( strDestPath, cchDest, strSearchFor, strExePath, strExeName );
if( bFound )
return S_OK;
    WCHAR strLeafName[MAX_PATH] = {0};
    // Search all parent directories starting at .\ and using strFilename as the leaf name
StringCchCopy( strLeafName, MAX_PATH, strFilename );
bFound = DXUTFindMediaSearchParentDirs( strDestPath, cchDest, L".", strLeafName );
if( bFound )
return S_OK;
    // Search all parent directories starting at the exe's dir and using strFilename as the leaf name
bFound = DXUTFindMediaSearchParentDirs( strDestPath, cchDest, strExePath, strLeafName );
if( bFound )
return S_OK;
    // Search all parent directories starting at .\ and using "media\strFilename" as the leaf name
StringCchPrintf( strLeafName, MAX_PATH, L"media\\%s", strFilename );
bFound = DXUTFindMediaSearchParentDirs( strDestPath, cchDest, L".", strLeafName );
if( bFound )
return S_OK;
    // Search all parent directories starting at the exe's dir and using "media\strFilename" as the leaf name
bFound = DXUTFindMediaSearchParentDirs( strDestPath, cchDest, strExePath, strLeafName );
if( bFound )
return S_OK;
    // On failure, return the file as the path but also return an error code
StringCchCopy( strDestPath, cchDest, strFilename );
    return DXUTERR_MEDIANOTFOUND;
}

函数首先对参数的合法性进行检查,接着调用GetModuleName()取得进程的全路径名:

    // Get the exe name, and exe path
WCHAR strExePath[MAX_PATH] = {0};
WCHAR strExeName[MAX_PATH] = {0};
WCHAR* strLastSlash = NULL;

GetModuleFileName(NULL, strExePath, MAX_PATH);
strExePath[MAX_PATH-1] = 0;

该函数声明如下:

The GetModuleFileName function retrieves the fully-qualified path for the file that contains the specified module that the current process owns.

GetModuleFileName operates only on modules that the current process owns. To specify modules that belong to another process, use the GetModuleFileNameEx function.

DWORD GetModuleFileName(
HMODULE hModule,
LPTSTR lpFilename,
DWORD nSize
);

Parameters

hModule
[in] Handle to the module whose path is being requested. If this parameter is NULL, GetModuleFileName retrieves the path of the executable file of the current process.
lpFilename
[out] Pointer to a buffer that receives a null-terminated string that specifies the fully-qualified path of the module. If the length of the path exceeds the size that the nSize parameter specifies, the function succeeds, and the string is truncated to nSize characters and cannot be null terminated.

The string returned will use the same format that was specified when the module was loaded. Therefore, the path can be a long or short file name, and can use the prefix "\\?\". For more information, see Naming a File.

To separate the path from the file name and extension, use the PathRemoveFileSpec function. Note that this function does not support paths with the "\\?\" prefix.

nSize
[in] Size of the lpFilename buffer, in TCHARs.

Return Values

If the function succeeds, the return value is the length of the string that is copied to the buffer, in TCHARs. If the buffer is too small to hold the module name, the string is truncated to nSize, and the function returns nSize.

If the function fails, the return value is 0 (zero). To get extended error information, call GetLastError.

Remarks

If a DLL is loaded in two processes, its file name in one process may differ in case from its file name in the other process.

For the ANSI version of the function, the number of TCHARs is the number of bytes; for the Unicode version, it is the number of characters.

The global variable _pgmptr is automatically initialized to the full path of the executable file, and can be used to retrieve the full path name of an executable file.

Windows Me/98/95:  This function retrieves long file names when an application version number is greater than or equal to 4.00 and the long file name is available. Otherwise, it returns only 8.3 format file names.

接着将当前进程执行文件的路径存储在strExePath,将进程执行文件名存储在strExeName:

    strLastSlash = wcsrchr( strExePath, TEXT('\\') );
    if( strLastSlash )
{
StringCchCopy( strExeName, MAX_PATH, &strLastSlash[1] );
        // Chop the exe name from the exe path
*strLastSlash = 0;
        // Chop the .exe from the exe name
strLastSlash = wcsrchr( strExeName, TEXT('.') );
if( strLastSlash )
*strLastSlash = 0;
}

函数接着按下面的路径查找顺序查找媒体文件:

// Typical directories:
// .\
// ..\
// ..\..\
// %EXE_DIR%\
// %EXE_DIR%\..\
// %EXE_DIR%\..\..\
// %EXE_DIR%\..\%EXE_NAME%
// %EXE_DIR%\..\..\%EXE_NAME%

    // Typical directory search
bFound = DXUTFindMediaSearchTypicalDirs( strDestPath, cchDest, strFilename, strExePath, strExeName );
if( bFound )
return S_OK;

如果没有找到,则在上面指定的路径中增加一级目录media查找,即:

// Typical directories:
// .\media
// ..\media
// ..\..\media
// %EXE_DIR%\media
// %EXE_DIR%\..\media
// %EXE_DIR%\..\..\media
// %EXE_DIR%\..\%EXE_NAME%\media
// %EXE_DIR%\..\..\%EXE_NAME%\media

    // Typical directory search again, but also look in a subdir called "\media\" 
StringCchPrintf( strSearchFor, MAX_PATH, L"media\\%s", strFilename );
bFound = DXUTFindMediaSearchTypicalDirs( strDestPath, cchDest, strSearchFor, strExePath, strExeName );
if( bFound )
return S_OK;

若还没找到,则在当前工作目录的所有父目录中查找:

    // Search all parent directories starting at .\ and using strFilename as the leaf name
StringCchCopy( strLeafName, MAX_PATH, strFilename );
bFound = DXUTFindMediaSearchParentDirs( strDestPath, cchDest, L".", strLeafName );
if( bFound )
return S_OK;

若还没找到,则在可执行文件的所有父目录中查找:

    // Search all parent directories starting at the exe's dir and using strFilename as the leaf name
bFound = DXUTFindMediaSearchParentDirs( strDestPath, cchDest, strExePath, strLeafName );
if( bFound )
return S_OK;

若还没找到,则在当前工作目录的所有父目录中增加一层目录media中(相当于文件名变为media\filename)查找:

    // Search all parent directories starting at .\ and using "media\strFilename" as the leaf name
StringCchPrintf( strLeafName, MAX_PATH, L"media\\%s", strFilename );
bFound = DXUTFindMediaSearchParentDirs( strDestPath, cchDest, L".", strLeafName );
if( bFound )
return S_OK;

若还没找到,则在可执行文件的所有父目录中增加一层目录media中(相当于文件名变为media\filename)查找:

    // Search all parent directories starting at the exe's dir and using "media\strFilename" as the leaf name
bFound = DXUTFindMediaSearchParentDirs( strDestPath, cchDest, strExePath, strLeafName );
if( bFound )
return S_OK;

若都没找到,则返回文件名为参数strDestPath,并返回错误值。

     // On failure, return the file as the path but also return an error code
StringCchCopy( strDestPath, cchDest, strFilename );
    return DXUTERR_MEDIANOTFOUND;

posted on 2008-05-28 16:33 lovedday 阅读(1917) 评论(2)  编辑 收藏 引用 所属分类: ■ DXUT Research

评论

# re: DXUT源码分析 ---- 媒体文件查找函数 2008-05-29 09:19 安晓辉

你好,看你的博客,你正在分析DXUT。我目前也在做这方面的工作,主要是做一个GUI库,以DXUTGUI为基础。我的博客:http://blog.csdn.net/foruok

看你贴的D3D的文章,有一些与《精通DIRECTX 3D图形与动画程序设计》一样,你是该书的作者吗?我买了本。

我刚开始接触D3D,很多问题似是而非。

有个问题请教一下:

你知道,DXUTGUI内嵌了一个512X512的纹理,按钮等元素的纹理都放在了这个纹理中。我修改DXUTGUI时改变了按钮、窗口、组合框等的绘制方式,使其可以支持纹理定制。以窗口为例,我添加了背景,把窗口背景分成9部分,当窗口尺寸变化时,我重复纹理贴图,保证边框不变形,中间部分用一个小纹理填充。这样可以得到一个比较好的效果。现在的问题是:当我想要用重叠纹理寻址模式时,不能利用512X512纹理的部分区域,只能用一个新的小纹理。有没有办法可以打破这种局限?

目前我自己根据目标矩形和用于填充的纹理的尺寸进行计算,每次平移目标矩形,然后重复调用ID3DXSprite的draw函数,可以实现,但是效率很低下。有没有别的更好的方法呢?

希望可以得到你的回复。  回复  更多评论   

# re: DXUT源码分析 ---- 媒体文件查找函数 2008-05-30 18:25 lovedday

首先我做几点说明,我不是《精通DIRECTX 3D图形与动画程序设计》的作者,和你一样,我也只是D3D的初学者,那些文章可算是我的看书笔记,方便自己查阅。由于个人能力和时间所限,尚无法对DXUT的源码进行系统完整的分析,也没研究过里面的UI设计源码。

我不知道怎么打破你说的哪种情况,似乎用一个新的小纹理是一种比较好的解决方案。

PS:我看过你写的"DXUTGUI控件的定制",很不错,感谢 :)  回复  更多评论   


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