Simplification and cleanup of windows opengl initialization.

Removed r_colorbits, use desktop color depth as default value. Nevertheless if there are issues when looking
for corresponding pixel format it is still posible to obtain pixel format with color depth that is different
from desktop color.
No changes to game modules, which means that game UI can still set r_colorbits but it has no effect.

src/engine/client/cl_cin.c

@@ -52,7 +52,6 @@ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 
 #define MAX_VIDEO_HANDLES	16
 
-extern glconfig_t glConfig;
 extern	int		s_paintedtime;
 extern	int		s_rawend;
 

src/engine/platform/glw_win.h

@@ -35,14 +35,11 @@ typedef struct
 
 	HINSTANCE hinstOpenGL;	// HINSTANCE for the OpenGL library
 
-	qboolean allowdisplaydepthchange;
 	qboolean pixelFormatSet;
 
 	int		 desktopBitsPixel;
 	int		 desktopWidth, desktopHeight;
 
-	qboolean	cdsFullscreen;
-
 	FILE *log_fp;
 } glwstate_t;
 

src/engine/platform/win_qgl.c

@@ -3192,25 +3192,10 @@ void QGL_Shutdown( void )
 */
 qboolean QGL_Init( const char *dllname )
 {
-	char systemDir[1024];
-	char libName[1024];
-
-	GetSystemDirectory( systemDir, sizeof( systemDir ) );
-
 	assert( glw_state.hinstOpenGL == 0 );
 
 	ri.Printf( PRINT_ALL, "...initializing QGL\n" );
-
-	if ( dllname[0] != '!' )
-	{
-		Com_sprintf( libName, sizeof( libName ), "%s\\%s", systemDir, dllname );
-	}
-	else
-	{
-		Q_strncpyz( libName, dllname, sizeof( libName ) );
-	}
-
-	ri.Printf( PRINT_ALL, "...calling LoadLibrary( '%s.dll' ): ", libName );
+	ri.Printf( PRINT_ALL, "...calling LoadLibrary('%s'): ", dllname );
 
 	if ( ( glw_state.hinstOpenGL = LoadLibrary( dllname ) ) == 0 )
 	{

src/engine/platform/win_wndproc.c

@@ -38,45 +38,6 @@ extern cvar_t *r_fullscreen;
 
 LONG WINAPI MainWndProc( HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam );
 
-static qboolean s_alttab_disabled;
-
-static void WIN_DisableAltTab( void )
-{
-	if ( s_alttab_disabled )
-		return;
-
-	if ( !Q_stricmp( Cvar_VariableString( "arch" ), "winnt" ) )
-	{
-		RegisterHotKey( 0, 0, MOD_ALT, VK_TAB );
-	}
-	else
-	{
-		BOOL old;
-
-		SystemParametersInfo( SPI_SCREENSAVERRUNNING, 1, &old, 0 );
-	}
-	s_alttab_disabled = qtrue;
-}
-
-static void WIN_EnableAltTab( void )
-{
-	if ( s_alttab_disabled )
-	{
-		if ( !Q_stricmp( Cvar_VariableString( "arch" ), "winnt" ) )
-		{
-			UnregisterHotKey( 0, 0 );
-		}
-		else
-		{
-			BOOL old;
-
-			SystemParametersInfo( SPI_SCREENSAVERRUNNING, 0, &old, 0 );
-		}
-
-		s_alttab_disabled = qfalse;
-	}
-}
-
 /*
 ==================
 VID_AppActivate
@@ -287,15 +248,6 @@ LONG WINAPI MainWndProc (
 		vid_ypos = Cvar_Get ("vid_ypos", "22", CVAR_ARCHIVE);
 		r_fullscreen = Cvar_Get ("r_fullscreen", "1", CVAR_ARCHIVE | CVAR_LATCH );
 
-		if ( r_fullscreen->integer )
-		{
-			WIN_DisableAltTab();
-		}
-		else
-		{
-			WIN_EnableAltTab();
-		}
-
 		break;
 #if 0
 	case WM_DISPLAYCHANGE:
@@ -314,10 +266,6 @@ LONG WINAPI MainWndProc (
 	case WM_DESTROY:
 		// let sound and input know about this?
 		g_wv.hWnd = NULL;
-		if ( r_fullscreen->integer )
-		{
-			WIN_EnableAltTab();
-		}
 		break;
 
 	case WM_CLOSE:

src/engine/renderer/tr_init.c

@@ -86,7 +86,6 @@ cvar_t	*r_logFile;
 
 cvar_t	*r_stencilbits;
 cvar_t	*r_depthbits;
-cvar_t	*r_colorbits;
 cvar_t	*r_stereo;
 cvar_t	*r_primitives;
 cvar_t	*r_texturebits;
@@ -189,8 +188,6 @@ static void AssertCvarRange( cvar_t *cv, float minVal, float maxVal, qboolean sh
 */
 static void InitOpenGL( void )
 {
-	char renderer_buffer[1024];
-
 	//
 	// initialize OS specific portions of the renderer
 	//
@@ -198,21 +195,16 @@ static void InitOpenGL( void )
 	//		- r_fullscreen
 	//		- r_glDriver
 	//		- r_mode
-	//		- r_(color|depth|stencil)bits
+	//		- r_(depth|stencil)bits
 	//		- r_ignorehwgamma
 	//		- r_gamma
 	//
-	
 	if ( glConfig.vidWidth == 0 )
 	{
-		GLint		temp;
-		
 		GLimp_Init();
 
-		strcpy( renderer_buffer, glConfig.renderer_string );
-		Q_strlwr( renderer_buffer );
-
 		// OpenGL driver constants
+        GLint temp;
 		qglGetIntegerv( GL_MAX_TEXTURE_SIZE, &temp );
 		glConfig.maxTextureSize = temp;
 
@@ -859,7 +851,6 @@ void R_Register( void )
 	AssertCvarRange( r_picmip, 0, 16, qtrue );
 	r_detailTextures = ri.Cvar_Get( "r_detailtextures", "1", CVAR_ARCHIVE | CVAR_LATCH );
 	r_texturebits = ri.Cvar_Get( "r_texturebits", "0", CVAR_ARCHIVE | CVAR_LATCH );
-	r_colorbits = ri.Cvar_Get( "r_colorbits", "0", CVAR_ARCHIVE | CVAR_LATCH );
 	r_stereo = ri.Cvar_Get( "r_stereo", "0", CVAR_ARCHIVE | CVAR_LATCH );
 #ifdef __linux__
 	r_stencilbits = ri.Cvar_Get( "r_stencilbits", "0", CVAR_ARCHIVE | CVAR_LATCH );

src/engine/renderer/tr_local.h

@@ -987,7 +987,6 @@ extern cvar_t	*r_znear;				// near Z clip plane
 
 extern cvar_t	*r_stencilbits;			// number of desired stencil bits
 extern cvar_t	*r_depthbits;			// number of desired depth bits
-extern cvar_t	*r_colorbits;			// number of desired color bits, only relevant for fullscreen
 extern cvar_t	*r_stereo;				// desired pixelformat stereo flag
 extern cvar_t	*r_texturebits;			// number of desired texture bits
 										// 0 = use framebuffer depth