--- a/WhatsNew	Thu Apr 27 07:59:16 2006 +0000
+++ b/WhatsNew	Thu Apr 27 08:39:51 2006 +0000
@@ -6,6 +6,8 @@
 1.2.10:
 	Added SDL_GL_SWAP_CONTROL to wait for vsync in OpenGL applications.
 
+	Added SDL_GL_ACCELERATED_VISUAL to guarantee hardware acceleration.
+
 	Added current_w and current_h to the SDL_VideoInfo structure,
 	which is set to the desktop resolution during video intialization,
 	and then set to the current resolution when a video mode is set.

--- a/include/SDL_video.h	Thu Apr 27 07:59:16 2006 +0000
+++ b/include/SDL_video.h	Thu Apr 27 08:39:51 2006 +0000
@@ -214,6 +214,7 @@
     SDL_GL_STEREO,
     SDL_GL_MULTISAMPLEBUFFERS,
     SDL_GL_MULTISAMPLESAMPLES,
+    SDL_GL_ACCELERATED_VISUAL,
     SDL_GL_SWAP_CONTROL
 } SDL_GLattr;
 

--- a/src/video/SDL_sysvideo.h	Thu Apr 27 07:59:16 2006 +0000
+++ b/src/video/SDL_sysvideo.h	Thu Apr 27 08:39:51 2006 +0000
@@ -292,6 +292,7 @@
 		int stereo;
 		int multisamplebuffers;
 		int multisamplesamples;
+		int accelerated;
 		int swap_control;
 		int driver_loaded;
 		char driver_path[256];

--- a/src/video/SDL_video.c	Thu Apr 27 07:59:16 2006 +0000
+++ b/src/video/SDL_video.c	Thu Apr 27 08:39:51 2006 +0000
@@ -233,6 +233,7 @@
 	video->gl_config.stereo = 0;
 	video->gl_config.multisamplebuffers = 0;
 	video->gl_config.multisamplesamples = 0;
+	video->gl_config.accelerated = -1; /* not known, don't set */
 	video->gl_config.swap_control = -1; /* not known, don't set */
 	
 	/* Initialize the video subsystem */
@@ -1475,6 +1476,9 @@
 		case SDL_GL_MULTISAMPLESAMPLES:
 			video->gl_config.multisamplesamples = value;
 			break;
+		case SDL_GL_ACCELERATED_VISUAL:
+			video->gl_config.accelerated = value;
+			break;
 		case SDL_GL_SWAP_CONTROL:
 			video->gl_config.swap_control = value;
 			break;

--- a/src/video/maccommon/SDL_macgl.c	Thu Apr 27 07:59:16 2006 +0000
+++ b/src/video/maccommon/SDL_macgl.c	Thu Apr 27 08:39:51 2006 +0000
@@ -34,7 +34,7 @@
 #if SDL_VIDEO_OPENGL
 	AGLPixelFormat format;
    	int i = 0;
-	GLint attributes [ 24 ]; /* 24 is max possible in this setup */
+	GLint attributes [ 26 ]; /* 26 is max possible in this setup */
 	GLboolean noerr;
    
 	/* load the gl driver from a default path */
@@ -95,6 +95,11 @@
 		attributes[i++] = this->gl_config.multisamplesamples;
 	}	
 #endif
+	if ( this->gl_config.accelerated > 0 ) {
+		attributes[i++] = AGL_ACCELERATED;
+		attributes[i++] = AGL_NO_RECOVERY;
+	}
+
 	attributes[i++] = AGL_ALL_RENDERERS;
 	attributes[i]	= AGL_NONE;
 

--- a/src/video/quartz/SDL_QuartzGL.m	Thu Apr 27 07:59:16 2006 +0000
+++ b/src/video/quartz/SDL_QuartzGL.m	Thu Apr 27 08:39:51 2006 +0000
@@ -112,6 +112,10 @@
         attr[i++] = NSOpenGLPFANoRecovery;
     }
 
+    if ( this->gl_config.accelerated > 0 ) {
+        attr[i++] = NSOpenGLPFAAccelerated;
+    }
+
     attr[i++] = NSOpenGLPFAScreenMask;
     attr[i++] = CGDisplayIDToOpenGLDisplayMask (display_id);
     attr[i] = 0;
@@ -242,8 +246,22 @@
             glGetIntegerv (GL_ALPHA_BITS, &component); bits += component;
 
             *value = bits;
+            return 0;
         }
-        return 0;
+        case SDL_GL_ACCELERATED_VISUAL:
+        {
+            long val;
+            [fmt getValues: &val forAttribute: NSOpenGLPFAAccelerated attr forVirtualScreen: 0];
+            *value = val;
+            return 0;
+        }
+        case SDL_GL_SWAP_CONTROL:
+        {
+            long val;
+            [ gl_context getValues: &val forParameter: NSOpenGLCPSwapInterval ];
+            *value = val;
+            return 0;
+        }
     }
 
     glGetIntegerv (attr, (GLint *)value);

--- a/src/video/wincommon/SDL_wingl.c	Thu Apr 27 07:59:16 2006 +0000
+++ b/src/video/wincommon/SDL_wingl.c	Thu Apr 27 08:39:51 2006 +0000
@@ -290,6 +290,11 @@
 			*iAttr++ = this->gl_config.multisamplesamples;
 		}
 
+		if ( this->gl_config.accelerated >= 0 ) {
+			*iAttr++ = WGL_ACCELERATION_ARB;
+			*iAttr++ = (this->gl_config.accelerated ? WGL_GENERIC_ACCELERATION_ARB : WGL_NO_ACCELERATION_ARB);
+		}
+
 		*iAttr = 0;
 
 		/* Choose and set the closest available pixel format */
@@ -442,6 +447,16 @@
 		    case SDL_GL_MULTISAMPLESAMPLES:
 			wgl_attrib = WGL_SAMPLES_ARB;
 			break;
+		    case SDL_GL_ACCELERATED_VISUAL:
+			wgl_attrib = WGL_ACCELERATION_ARB;
+			this->gl_data->wglGetPixelFormatAttribivARB(GL_hdc, pixel_format, 0, 1, &wgl_attrib, value);
+			if ( *value == WGL_NO_ACCELERATION_ARB ) {
+				*value = SDL_FALSE;
+			} else {
+				*value = SDL_TRUE;
+			}
+			return 0;
+			break;
 		    case SDL_GL_SWAP_CONTROL:
 			if ( this->gl_data->wglGetSwapIntervalEXT ) {
 				return this->gl_data->wglGetSwapIntervalEXT();

--- a/src/video/x11/SDL_x11gl.c	Thu Apr 27 07:59:16 2006 +0000
+++ b/src/video/x11/SDL_x11gl.c	Thu Apr 27 08:39:51 2006 +0000
@@ -43,6 +43,47 @@
 #define GLX_SAMPLES_ARB                    100001
 #endif
 
+#ifndef GLX_EXT_visual_rating
+#define GLX_EXT_visual_rating
+#define GLX_VISUAL_CAVEAT_EXT              0x20
+#define GLX_SLOW_VISUAL_EXT                0x8001
+#define GLX_NON_CONFORMANT_VISUAL_EXT      0x800D
+#endif
+
+#if SDL_VIDEO_OPENGL_GLX
+static int glXExtensionSupported(_THIS, const char *extension)
+{
+	const char *extensions;
+	const char *start;
+	const char *where, *terminator;
+
+	/* Extension names should not have spaces. */
+	where = SDL_strchr(extension, ' ');
+	if ( where || *extension == '\0' ) {
+	      return 0;
+	}
+
+	extensions = this->gl_data->glXQueryExtensionsString(GFX_Display,SDL_Screen);
+	/* It takes a bit of care to be fool-proof about parsing the
+	 * OpenGL extensions string. Don't be fooled by sub-strings, etc.
+	 */
+	
+	start = extensions;
+	
+	for (;;) {
+		where = SDL_strstr(start, extension);
+		if (!where) break;
+		
+		terminator = where + strlen(extension);
+		if (where == start || *(where - 1) == ' ')
+	        if (*terminator == ' ' || *terminator == '\0') return 1;
+						  
+		start = terminator;
+	}
+	return 0;
+}
+#endif /* SDL_VIDEO_OPENGL_GLX */
+
 XVisualInfo *X11_GL_GetVisual(_THIS)
 {
 #if SDL_VIDEO_OPENGL_GLX
@@ -138,6 +179,12 @@
 		attribs[i++] = this->gl_config.multisamplesamples;
 	}
 
+	if( this->gl_config.accelerated >= 0 &&
+	    glXExtensionSupported(this, "GLX_EXT_visual_rating") ) {
+		attribs[i++] = GLX_VISUAL_CAVEAT_EXT;
+		attribs[i++] = this->gl_config.accelerated ? GLX_NONE : GLX_DONT_CARE;
+	}
+
 #ifdef GLX_DIRECT_COLOR /* Try for a DirectColor visual for gamma support */
 	if ( !SDL_getenv("SDL_VIDEO_X11_NODIRECTCOLOR") ) {
 		attribs[i++] = GLX_X_VISUAL_TYPE;
@@ -205,7 +252,6 @@
 {
 	int retval;
 #if SDL_VIDEO_OPENGL_GLX
-	const char *glXext;
 
 	/* We do this to create a clean separation between X and GLX errors. */
 	XSync( SDL_Display, False );
@@ -222,12 +268,10 @@
 	}
 	gl_active = 1;
 
-	/* The use of strstr here should be safe */
-	glXext = this->gl_data->glXQueryExtensionsString(GFX_Display, DefaultScreen(GFX_Display));
-	if ( !SDL_strstr(glXext, "SGI_swap_control") ) {
+	if ( !glXExtensionSupported(this, "SGI_swap_control") ) {
 		this->gl_data->glXSwapIntervalSGI = NULL;
 	}
-	if ( !SDL_strstr(glXext, "GLX_MESA_swap_control") ) {
+	if ( !glXExtensionSupported(this, "GLX_MESA_swap_control") ) {
 		this->gl_data->glXSwapIntervalMESA = NULL;
 		this->gl_data->glXGetSwapIntervalMESA = NULL;
 	}
@@ -340,11 +384,25 @@
  	    case SDL_GL_MULTISAMPLESAMPLES:
  		glx_attrib = GLX_SAMPLES_ARB;
  		break;
+ 	    case SDL_GL_ACCELERATED_VISUAL:
+		if ( glXExtensionSupported(this, "GLX_EXT_visual_rating") ) {
+			glx_attrib = GLX_VISUAL_CAVEAT_EXT;
+			retval = this->gl_data->glXGetConfig(GFX_Display, glx_visualinfo, glx_attrib, value);
+			if ( *value == GLX_SLOW_VISUAL_EXT ) {
+				*value = SDL_FALSE;
+			} else {
+				*value = SDL_TRUE;
+			}
+			return retval;
+		} else {
+			return(-1);
+		}
+		break;
 	    case SDL_GL_SWAP_CONTROL:
 		if ( this->gl_data->glXGetSwapIntervalMESA ) {
 			return this->gl_data->glXGetSwapIntervalMESA();
 		} else {
-			return -1 /*(this->gl_config.swap_control > 0)*/;
+			return(-1)/*(this->gl_config.swap_control > 0)*/;
 		}
 		break;
 	    default:

--- a/test/testgl.c	Thu Apr 27 07:59:16 2006 +0000
+++ b/test/testgl.c	Thu Apr 27 08:39:51 2006 +0000
@@ -445,7 +445,7 @@
 }
 
 int RunGLTest( int argc, char* argv[],
-               int logo, int logocursor, int slowly, int bpp, float gamma, int noframe, int fsaa, int sync )
+               int logo, int logocursor, int slowly, int bpp, float gamma, int noframe, int fsaa, int sync, int accel )
 {
 	int i;
 	int rgb_size[3];
@@ -531,6 +531,9 @@
 		SDL_GL_SetAttribute( SDL_GL_MULTISAMPLEBUFFERS, 1 );
 		SDL_GL_SetAttribute( SDL_GL_MULTISAMPLESAMPLES, fsaa );
 	}
+	if ( accel ) {
+		SDL_GL_SetAttribute( SDL_GL_ACCELERATED_VISUAL, 1 );
+	}
 	if ( sync ) {
 		SDL_GL_SetAttribute( SDL_GL_SWAP_CONTROL, 1 );
 	} else {
@@ -566,6 +569,10 @@
 		SDL_GL_GetAttribute( SDL_GL_MULTISAMPLESAMPLES, &value );
 		printf("SDL_GL_MULTISAMPLESAMPLES: requested %d, got %d\n", fsaa, value );
 	}
+	if ( accel ) {
+		SDL_GL_GetAttribute( SDL_GL_ACCELERATED_VISUAL, &value );
+		printf( "SDL_GL_ACCELERATED_VISUAL: requested 1, got %d\n", value );
+	}
 	if ( sync ) {
 		SDL_GL_GetAttribute( SDL_GL_SWAP_CONTROL, &value );
 		printf( "SDL_GL_SWAP_CONTROL: requested 1, got %d\n", value );
@@ -779,6 +786,7 @@
 	float gamma = 0.0;
 	int noframe = 0;
 	int fsaa = 0;
+	int accel = 0;
 	int sync = 0;
 
 	logo = 0;
@@ -814,6 +822,9 @@
 		if ( strcmp(argv[i], "-fsaa") == 0 ) {
  		       ++fsaa;
 		}
+		if ( strcmp(argv[i], "-accel") == 0 ) {
+ 		       ++accel;
+		}
 		if ( strcmp(argv[i], "-sync") == 0 ) {
  		       ++sync;
 		}
@@ -825,7 +836,7 @@
 		}
 	}
 	for ( i=0; i<numtests; ++i ) {
- 		RunGLTest(argc, argv, logo, logocursor, slowly, bpp, gamma, noframe, fsaa, sync);
+ 		RunGLTest(argc, argv, logo, logocursor, slowly, bpp, gamma, noframe, fsaa, sync, accel);
 	}
 	return 0;
 }