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diff src/video/windx5/SDL_dx5video.c @ 1295:c3e36ac8a94c

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Date: Sun, 6 Mar 2005 17:06:20 +0100 From: Per Inge Mathisen Subject: [SDL] Fullscreen refresh on win32 Windows has a terrible default for fullscreen 3D apps of 60mhz refresh rate. This can be fixed by the user by going into his driver's control panel and forcing the refresh rate higher. However, this not a very user friendly way about it, and in any case SDL contains no code that could figure out this that condition has afflicted the user. So the question is, could SDL fix this for the user? It is possible under Windows to request a higher refresh rate. The danger is of course that if the user has an old monitor, and you request a too high refresh rate, the monitor could be damaged. However, I believe there might be a way around that: Check before switching what refresh rate the user's desktop runs in, and if our fullscreen dimensions are equal or less than those of the desktop, use the higher refresh rate of 60 and the desktop rate. Since most users run their desktops in the same or higher resolution something sane, this should fix this problem for most users. Thoughts? An alternative is to add an SDL_GL_GetAttribute(SDL_GL_REFRESH_RATE) option so that programs can bitch at their users at their own convenience. - Per
author Sam Lantinga <slouken@libsdl.org>
date Mon, 30 Jan 2006 06:56:10 +0000
parents 31331c444ea2
children c9b51268668f
line wrap: on
line diff
--- a/src/video/windx5/SDL_dx5video.c	Sun Jan 29 23:14:04 2006 +0000
+++ b/src/video/windx5/SDL_dx5video.c	Mon Jan 30 06:56:10 2006 +0000
@@ -656,6 +656,14 @@
 	int bpp = desc->ddpfPixelFormat.dwRGBBitCount;
 	int refreshRate = desc->dwRefreshRate;
 #endif
+	int maxRefreshRate;
+
+	if ( desc->dwWidth <= SDL_desktop_mode.dmPelsWidth &&
+	     desc->dwHeight <= SDL_desktop_mode.dmPelsHeight ) {
+		maxRefreshRate = SDL_desktop_mode.dmDisplayFrequency;
+	} else {
+		maxRefreshRate = 85;	/* safe value? */
+	}
 
 	switch (bpp)  {
 		case 8:
@@ -667,7 +675,7 @@
 			     enumlists[bpp]->r.w == (Uint16)desc->dwWidth &&
 			     enumlists[bpp]->r.h == (Uint16)desc->dwHeight ) {
 				if ( refreshRate > enumlists[bpp]->refreshRate &&
-				     refreshRate <= 85 /* safe value? */ ) {
+				     refreshRate <= maxRefreshRate ) {
 					enumlists[bpp]->refreshRate = refreshRate;
 #ifdef DDRAW_DEBUG
  fprintf(stderr, "New refresh rate for %d bpp: %dx%d at %d Hz\n", (bpp+1)*8, (int)desc->dwWidth, (int)desc->dwHeight, refreshRate);
@@ -926,6 +934,11 @@
 					GetDeviceCaps(hdc,BITSPIXEL);
 	ReleaseDC(SDL_Window, hdc);
 
+#ifndef NO_CHANGEDISPLAYSETTINGS
+	/* Query for the desktop resolution */
+	EnumDisplaySettings(NULL, ENUM_CURRENT_SETTINGS, &SDL_desktop_mode);
+#endif
+
 	/* Enumerate the available fullscreen modes */
 	for ( i=0; i<NUM_MODELISTS; ++i )
 		enumlists[i] = NULL;
@@ -1093,6 +1106,7 @@
 		 */
 		if ( (flags & SDL_FULLSCREEN) == SDL_FULLSCREEN ) {
 			DEVMODE settings;
+			BOOL changed;
 
 			memset(&settings, 0, sizeof(DEVMODE));
 			settings.dmSize = sizeof(DEVMODE);
@@ -1100,7 +1114,16 @@
 			settings.dmPelsWidth = width;
 			settings.dmPelsHeight = height;
 			settings.dmFields = DM_PELSWIDTH | DM_PELSHEIGHT | DM_BITSPERPEL;
-			if ( ChangeDisplaySettings(&settings, CDS_FULLSCREEN) == DISP_CHANGE_SUCCESSFUL ) {
+			if ( width <= SDL_desktop_mode.dmPelsWidth && height <= SDL_desktop_mode.dmPelsHeight ) {
+				settings.dmDisplayFrequency = SDL_desktop_mode.dmDisplayFrequency;
+				settings.dmFields |= DM_DISPLAYFREQUENCY;
+			}
+			changed = (ChangeDisplaySettings(&settings, CDS_FULLSCREEN) == DISP_CHANGE_SUCCESSFUL);
+			if ( ! changed && (settings.dmFields & DM_DISPLAYFREQUENCY) ) {
+				settings.dmFields &= ~DM_DISPLAYFREQUENCY;
+				changed = (ChangeDisplaySettings(&settings, CDS_FULLSCREEN) == DISP_CHANGE_SUCCESSFUL);
+			}
+			if ( changed ) {
 				video->flags |= SDL_FULLSCREEN;
 				SDL_fullscreen_mode = settings;
 			}