From b46caf3cc7d902895f9372b1a936f9113ece03ce Mon Sep 17 00:00:00 2001
From: stephena <stephena@8b62c5a3-ac7e-4cc8-8f21-d9a121418aba>
Date: Tue, 4 Jan 2005 21:04:20 +0000
Subject: [PATCH] Changed 'gl_fsmax' to mean "use desktop resolution in
 fullscreen OpenGL mode". For OS's that don't support it, use the maximum
 resolution possible.

git-svn-id: svn://svn.code.sf.net/p/stella/code/trunk@354 8b62c5a3-ac7e-4cc8-8f21-d9a121418aba
---
 stella/docs/stella.html             | 14 +++++++++-----
 stella/src/common/FrameBufferGL.cxx | 26 ++++++++++++++++++++++++--
 2 files changed, 33 insertions(+), 7 deletions(-)

diff --git a/stella/docs/stella.html b/stella/docs/stella.html
index d236da36e..447d99fa5 100644
--- a/stella/docs/stella.html
+++ b/stella/docs/stella.html
@@ -217,7 +217,11 @@
 	<ul>
 		<li>Updated the sound system.  All popping and cracking sounds that previously
 			occurred at program start/stop and when entering/exiting menu or pause mode
-			have been eliminated.</li>
+			has been eliminated.</li>
+
+		<li>Fixed the <b>gl_fsmax</b> argument to mean "switch to desktop resolution
+			on fullscreen OpenGL", instead of to the maximum possible resolution
+			(the two are not always the same).</li>
 
 		<li>Added <b>Alt [</b> and <b>Alt ]</b> keys to dynamically adjust the
 			sound volume during emulation.</li>
@@ -225,7 +229,7 @@
 		<li>Added <b>Control 0</b>, <b>Control 1</b>, <b>Control 2</b>, <b>Control 3</b>
 			keys to dynamically change which paddle the mouse should emulate.</li>
 
-		<li>Added <b>-video_driver</b> argument.  This accepts the different options
+		<li>Added <b>video_driver</b> argument.  This accepts the different options
 			that can be specified for SDL_VIDEODRIVER (see SDL homepage for more
 			information).  Basically, it eliminates the need to set the SDL_VIDEODRIVER
 			environment variable.</li>
@@ -554,9 +558,9 @@
 
 		<tr>
 			<td><pre>-gl_fsmax &lt;0|1&gt;</pre></td>
-			<td>Use the maximum possible resolution when switching to fullscreen OpenGL
-				mode.  Under Linux (and Windows on laptops), this is usually the current
-				desktop resolution, so a video-mode switch can be avoided.</td>
+			<td>Use the current desktop resolution when switching to fullscreen OpenGL
+				mode (so a video-mode switch can be avoided).  If not supported, then
+				use the maximum possible resolution available.</td>
 		</tr>
 
 		<tr>
diff --git a/stella/src/common/FrameBufferGL.cxx b/stella/src/common/FrameBufferGL.cxx
index 582889a10..bac53f342 100644
--- a/stella/src/common/FrameBufferGL.cxx
+++ b/stella/src/common/FrameBufferGL.cxx
@@ -13,7 +13,7 @@
 // See the file "license" for information on usage and redistribution of
 // this file, and for a DISCLAIMER OF ALL WARRANTIES.
 //
-// $Id: FrameBufferGL.cxx,v 1.9 2005-01-04 19:59:12 stephena Exp $
+// $Id: FrameBufferGL.cxx,v 1.10 2005-01-04 21:04:20 stephena Exp $
 //============================================================================
 
 #include <SDL.h>
@@ -519,9 +519,31 @@ void FrameBufferGL::viewport(uInt32* screenWidth, uInt32* screenHeight,
 /*    cerr << "original image width   = " << iwidth  << endl
          << "original image height  = " << iheight << endl
          << endl; */
+    uInt32 desktopWidth  = this->screenWidth();
+    uInt32 desktopHeight = this->screenHeight();
 
     if(myConsole->settings().getBool("gl_fsmax") &&
-       myScreenmode != (SDL_Rect**) -1)
+       desktopWidth != 0 && desktopHeight != 0)
+    {
+      // Use the largest available screen size
+      swidth  = desktopWidth;
+      sheight = desktopHeight;
+
+      scaleX = float(iwidth)  / swidth;
+      scaleY = float(iheight) / sheight;
+
+      // Figure out which dimension is closest to the 10% mark,
+      // and calculate the scaling required to bring it to exactly 10%
+      if(scaleX > scaleY)
+        scale = (swidth * 0.9) / iwidth;
+      else
+        scale = (sheight * 0.9) / iheight;
+
+      iwidth  = (Uint16) (scale * iwidth);
+      iheight = (Uint16) (scale * iheight);
+    }
+    else if(myConsole->settings().getBool("gl_fsmax") &&
+            myScreenmode != (SDL_Rect**) -1)
     {
       // Use the largest available screen size
       swidth  = myScreenmode[0]->w;