1 files changed, 63 insertions, 0 deletions
diff --git a/samples/nv-control-screen.h b/samples/nv-control-screen.h
new file mode 100644
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--- /dev/null
+++ b/samples/nv-control-screen.h
@@ -0,0 +1,63 @@
+/*
+ * Copyright (c) 2010 NVIDIA Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+/*
+ * nv-control-screen.h - trivial helper for NV-CONTROL sample clients: use
+ * the default screen if it is an NVIDIA X screen.  If it isn't, then look
+ * for the first NVIDIA X screen.  Abort if no NVIDIA X screens are found.
+ */
+
+#ifndef __NV_CONTROL_SCREEN_H__
+#define __NV_CONTROL_SCREEN_H__
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <X11/Xlib.h>
+
+#include "NVCtrlLib.h"
+
+static inline int GetNvXScreen(Display *dpy)
+{
+    int defaultScreen, screen;
+
+    defaultScreen = DefaultScreen(dpy);
+
+    if (XNVCTRLIsNvScreen(dpy, defaultScreen)) {
+        return defaultScreen;
+    }
+
+    for (screen = 0; screen < ScreenCount(dpy); screen++) {
+        if (XNVCTRLIsNvScreen(dpy, screen)) {
+            printf("Default X screen %d is not an NVIDIA X screen.  "
+                   "Using X screen %d instead.\n",
+                   defaultScreen, screen);
+            return screen;
+        }
+    }
+
+    fprintf(stderr, "Unable to find any NVIDIA X screens; aborting.\n");
+
+    exit(1);
+}
+
+#endif /* __NV_CONTROL_SCREEN_H__ */