From 1b537be8d43c7b7a41f6eee31fb1db5175405175 Mon Sep 17 00:00:00 2001
From: Max Horn
Date: Sat, 13 Mar 2004 18:44:10 +0000
Subject: Patch #902111: Change remaining random function calls to use
 RandomSource

svn-id: r13262
---
 backends/midi/adlib.cpp | 20 ++++++--------------
 1 file changed, 6 insertions(+), 14 deletions(-)

(limited to 'backends')

diff --git a/backends/midi/adlib.cpp b/backends/midi/adlib.cpp
index 7fb0de39b1..6b6ebb3528 100644
--- a/backends/midi/adlib.cpp
+++ b/backends/midi/adlib.cpp
@@ -573,6 +573,8 @@ private:
 	bool _isOpen;
 	bool _game_SmallHeader;
 
+	static Common::RandomSource _rnd;
+
 	FM_OPL *_opl;
 	byte *_adlib_reg_cache;
 	SoundMixer *_mixer;
@@ -624,7 +626,6 @@ private:
 	void struct10_init(Struct10 * s10, InstrumentExtra * ie);
 	static byte struct10_ontimer(Struct10 * s10, Struct11 * s11);
 	static void struct10_setup(Struct10 * s10);
-	static int random_nr(int a);
 	void mc_key_on(AdlibVoice *voice, AdlibInstrument *instr, byte note, byte velocity);
 
 	static void premix_proc(void *param, int16 *buf, uint len);
@@ -1230,7 +1231,7 @@ void MidiDriver_ADLIB::struct10_setup(Struct10 *s10) {
 	t = s10->table_a[f];
 	e = num_steps_table[lookup_table[t & 0x7F][b]];
 	if (t & 0x80) {
-		e = random_nr(e);
+		e = _rnd.getRandomNumber(e);
 	}
 	if (e == 0)
 		e++;
@@ -1243,7 +1244,7 @@ void MidiDriver_ADLIB::struct10_setup(Struct10 *s10) {
 		t = s10->table_b[f];
 		d = lookup_volume(c, (t & 0x7F) - 31);
 		if (t & 0x80) {
-			d = random_nr(d);
+			d = _rnd.getRandomNumber(d);
 		}
 		if (d + g > c) {
 			h = c - g;
@@ -1305,17 +1306,6 @@ void MidiDriver_ADLIB::adlib_playnote(int channel, int note) {
 	adlib_write(channel + 0xB0, oct | 0x20);
 }
 
-int MidiDriver_ADLIB::random_nr(int a) {
-	static byte _rand_seed = 1;
-	if (_rand_seed & 1) {
-		_rand_seed >>= 1;
-		_rand_seed ^= 0xB8;
-	} else {
-		_rand_seed >>= 1;
-	}
-	return _rand_seed * a >> 8;
-}
-
 void MidiDriver_ADLIB::part_key_off(AdlibPart *part, byte note) {
 	AdlibVoice *voice;
 
@@ -1564,3 +1554,5 @@ void MidiDriver_ADLIB::adlib_note_on(int chan, byte note, int mod) {
 	curnote_table[chan] = code;
 	adlib_playnote(chan, (int16) channel_table_2[chan] + code);
 }
+
+Common::RandomSource MidiDriver_ADLIB::_rnd;
-- 
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