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engines/qdengine/qdcore/qd_rnd.h

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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * 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 QDENGINE_QDCORE_QD_RND_H
+#define QDENGINE_QDCORE_QD_RND_H
+
+#include "qdengine/qdengine.h"
+
+namespace QDEngine {
+
+/// Возвращает случайное значение в интервале [0, m-1].
+inline uint32 qd_rnd(uint32 m) {
+	if (!m)
+		return 0;
+
+	return g_engine->getRandomNumber(m - 1);
+}
+/// Возвращает случайное значение в интервале [-x, x].
+inline float qd_frnd(float x) {
+	return (float)(qd_rnd(0x7fff) * 2 - 0x7fff) * x / (float)0x7fff;
+}
+/// Возвращает случайное значение в интервале [0, x].
+inline float qd_fabs_rnd(float x) {
+	return (float)qd_rnd(0x7fff) * x / (float)0x7fff;
+}
+
+inline void qd_rnd_init(int seed = 83) {
+	g_engine->setSeed(seed);
+}
+
+
+} // namespace QDEngine
+
+#endif // QDENGINE_QDCORE_QD_RND_H