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diff --git a/src/state.h b/src/state.h
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+/**
+ * crt-calibrator – Calibration utility for CRT monitors
+ * Copyright © 2014  Mattias Andrée (maandree@member.fsf.org)
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef CRT_CALIBRATOR_STATE_H
+#define CRT_CALIBRATOR_STATE_H
+
+
+#include "framebuffer.h"
+#include "drmgamma.h"
+
+#include <stddef.h>
+
+
+/**
+ * The framebuffers on the system
+ */
+extern framebuffer_t* restrict framebuffers;
+
+/**
+ * The number of elements in `framebuffers`
+ */
+extern size_t framebuffer_count;
+
+/**
+ * The graphics cards on the system
+ */
+extern drm_card_t* restrict cards;
+
+/**
+ * The number of elements in `cards`
+ */
+extern size_t card_count;
+
+/**
+ * The connected CRT controllers on the system
+ */
+extern drm_crtc_t* restrict crtcs;
+
+/**
+ * The number of elements in `crtcs`
+ */
+extern size_t crtc_count;
+
+
+
+/**
+ * Acquire video control
+ * 
+ * @return  Zero on success, -1 on error
+ */
+int acquire_video(void);
+
+/**
+ * Release video control
+ */
+void release_video(void);
+
+
+#endif
+