shithub: cstory

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Add a replication of MSVC2003's rand() algorithm

This actually affects how the game sounds. Seriously, listen to the
dialogue boxes. Now it matches the original.

--- a/Makefile

+++ b/Makefile

@@ -115,6 +115,7 @@

 	src/Organya \

 	src/PixTone \

 	src/Profile \

+	src/Random \

 	src/Resource \

 	src/SelStage \

 	src/Shoot \

--- a/src/Game.cpp

+++ b/src/Game.cpp

@@ -37,6 +37,7 @@

 #include "NpcHit.h"

 #include "NpcTbl.h"

 #include "Profile.h"

+#include "Random.h"

 #include "SelStage.h"

 #include "Shoot.h"

 #include "Sound.h"

@@ -54,7 +55,7 @@

 int Random(int min, int max)

 {

 	const int range = max - min + 1;

-	return min + rand() % range;

+	return min + msvc_rand() % range;

 }

 void PutNumber4(int x, int y, int value, BOOL bZero)

--- a/src/PixTone.cpp

+++ b/src/PixTone.cpp

@@ -6,6 +6,8 @@

 #include "WindowsWrapper.h"

+#include "Random.h"

+

 static signed char gWaveModelTable[6][256];

 void MakeWaveTables(void)

@@ -54,9 +56,9 @@

 		gWaveModelTable[4][i] = -0x40;

 	// White noise wave

-	srand(0);

+	msvc_srand(0);

 	for (i = 0; i < 256; ++i)

-		gWaveModelTable[5][i] = (signed char)(rand() & 0xFF) / 2;

+		gWaveModelTable[5][i] = (signed char)(msvc_rand() & 0xFF) / 2;

 }

 BOOL MakePixelWaveData(const PIXTONEPARAMETER *ptp, unsigned char *pData)

--- /dev/null

+++ b/src/Random.cpp

@@ -1,0 +1,15 @@

+#include "Random.h"

+

+// A replication of MSVC's rand algorithm

+static unsigned long next = 1;

+

+int msvc_rand(void)

+{

+	next = ((next) * 214013 + 2531011);

+	return ((next) >> 16) & 0x7FFF;

+}

+

+void msvc_srand(unsigned int seed)

+{

+	next = seed;

+}

--- /dev/null

+++ b/src/Random.h

@@ -1,0 +1,4 @@

+#pragma once

+

+int msvc_rand(void);

+void msvc_srand(unsigned int seed);

-- 

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