Cygwin fixes

simgear/screen/RenderTexture.cpp

@@ -254,7 +254,7 @@ void PrintExtensionError( char* strMsg, ... )
     char strBuffer[512];
     va_list args;
     va_start(args, strMsg);
-#ifdef _WIN32
+#if defined _WIN32 && !defined __CYGWIN__
     _vsnprintf( strBuffer, 512, strMsg, args );
 #else
     vsnprintf( strBuffer, 512, strMsg, args );
@@ -264,6 +264,7 @@ void PrintExtensionError( char* strMsg, ... )
     fprintf(stderr, strMsg);
 }
 
+
 //---------------------------------------------------------------------------
 // Function     	: RenderTexture::Initialize
 // Description	    : 
@@ -294,7 +295,7 @@ bool RenderTexture::Initialize(int width, int height,
     if (_bInitialized)
         _Invalidate();
 
-#if _WIN32
+#ifdef _WIN32
     // Get the current context.
     HDC hdc = wglGetCurrentDC();
     if (NULL == hdc)
@@ -582,7 +583,7 @@ bool RenderTexture::_Invalidate()
         glDeleteTextures(1, &_iDepthTextureID);
     }
     
-#if _WIN32
+#ifdef _WIN32
     if ( _hPBuffer )
     {
         // Check if we are currently rendering in the pbuffer
@@ -675,7 +676,7 @@ bool RenderTexture::Reset(const char *strMode, ...)
     va_list args;
     char strBuffer[256];
     va_start(args,strMode);
-#ifdef _WIN32
+#if defined _WIN32 && !defined __CYGWIN__
     _vsnprintf( strBuffer, 256, strMode, args );
 #else
     vsnprintf( strBuffer, 256, strMode, args );
@@ -953,7 +954,7 @@ bool RenderTexture::BindBuffer( int iBuffer )
     {
         glBindTexture(_iTextureTarget, _iTextureID);
         
-#if _WIN32
+#ifdef _WIN32
         if (RT_RENDER_TO_TEXTURE == _eUpdateMode && _bIsTexture &&
             (!_bIsBufferBound || _iCurrentBoundBuffer != iBuffer))
         {