# HG changeset patch
# User Ryan C. Gordon <icculus@icculus.org>
# Date 1186425406 0
# Node ID 2b32a416d20246c94c75b23e7754cfaca045cacc
# Parent  98b219f9ff17e0d3bdc8000f82aa6be5d067eda6
Set an error message when SDL_GL_SetAttribute() fails because we can't support
 the attribute on X11.

diff -r 98b219f9ff17 -r 2b32a416d202 src/video/x11/SDL_x11gl.c
--- a/src/video/x11/SDL_x11gl.c	Sun Aug 05 03:21:18 2007 +0000
+++ b/src/video/x11/SDL_x11gl.c	Mon Aug 06 18:36:46 2007 +0000
@@ -338,7 +338,8 @@
 /* Get attribute data from glX. */
 int X11_GL_GetAttribute(_THIS, SDL_GLattr attrib, int* value)
 {
-	int retval;
+	int retval = -1;
+	int unsupported = 0;
 	int glx_attrib = None;
 
 	switch( attrib ) {
@@ -398,7 +399,7 @@
 			}
 			return retval;
 		} else {
-			return(-1);
+			unsupported = 1;
 		}
 		break;
 	    case SDL_GL_SWAP_CONTROL:
@@ -406,15 +407,19 @@
 			*value = this->gl_data->glXGetSwapIntervalMESA();
 			return(0);
 		} else {
-			return(-1);
+			unsupported = 1;
 		}
 		break;
 	    default:
-		return(-1);
+			unsupported = 1;
+			break;
 	}
 
-	retval = this->gl_data->glXGetConfig(GFX_Display, glx_visualinfo, glx_attrib, value);
-
+	if (unsupported) {
+		SDL_SetError("OpenGL attribute is unsupported on this system");
+	} else {
+		retval = this->gl_data->glXGetConfig(GFX_Display, glx_visualinfo, glx_attrib, value);
+	}
 	return retval;
 }