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engines/m4/core/imath.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 M4_CORE_IMATH_H
+#define M4_CORE_IMATH_H
+
+#include "common/endian.h"
+#include "m4/m4_types.h"
+
+namespace M4 {
+
+#define FRAC16(a,b) ((a<<16) + (b))
+
+#define Atan2F16(x1, x2) ArcTan(x1, x2)
+#define MulSF16(x1, x2) FixedMul(x1, x2)
+#define DivSF16(x1, x2) FixedDiv(x1, x2)
+#define RecipUF16(x) FixedDiv(1, x)
+#define SquareSF16(x) FixedMul(x, x)
+
+#define SWAP_INT16(x)	((((x)>>8)&0x00ff) + (((x)&0x00ff)<<8))
+#define SWAP_INT32(x)	((((int32)(x)&0x000000ff)<<24) + (((int32)(x)&0x0000ff00)<<8) + \
+		(((int32)(x)&0x00ff0000)>>8) + (((int32)(x)>>24)&0x000000ff))
+
+
+frac16 FixedMul(frac16 Multiplicand, frac16 Multiplier);
+frac16 FixedDiv(frac16 Dividend, frac16 Divisor);
+
+unsigned long sqrtul(unsigned long v);
+
+int32 imath_max(int32 a, int32 b);
+int32 imath_min(int32 a, int32 b);
+int32 imath_abs(int32 a);
+
+void imath_seed(int32 seedNum);
+uint32 imath_random();
+int32 imath_ranged_rand(int32 a, int32 b);
+frac16 imath_ranged_rand16(frac16 a, frac16 b);
+bool imath_rand_bool(int max);
+
+frac16 dist2d(int32 x1, int32 y1, int32 x2, int32 y2);
+frac16 SqrtF16(frac16 n);
+frac16 ArcTan(frac16 x, frac16 y);
+
+uint16 HighWord(uint32 n);
+uint16 LowWord(uint32 n);
+
+uint32 convert_intel32(uint32 a);
+uint16 convert_intel16(uint16 a);
+
+//
+//	I N L I N E S
+//
+
+inline short abs(short a) {
+	return (a >= 0) ? a : -a;
+}
+
+inline long abs(long a) {
+	return (a >= 0) ? a : -a;
+}
+
+inline int16 convert_intel16(void *src) {
+	return READ_LE_INT16(src);
+}
+
+} // namespace M4
+
+#endif