Pong and snake now use rand(3).

games/pong.cpp

@@ -6,6 +6,8 @@
 #include <libmaxsi/sortix-vga.h>
 #include <libmaxsi/sortix-keyboard.h>
 #include <libmaxsi/sortix-sound.h>
+#include <stdio.h>
+#include <stdlib.h>
 
 using namespace Maxsi;
 using namespace Maxsi::Keyboard;
@@ -107,22 +109,26 @@ void Goal(nat player)
 {
 	frame->text[ballx + bally*width] = ' ' | (COLOR8_WHITE << 8);
 
+	int offset = (rand() % 4) - 2;
 	ballx = width/2;
-	bally = height/2;
+	bally = height/2 + offset;
 
 	if ( player == 1 )
 	{
 		ballvelx = 1;
-		ballvely = 1;
+		ballvely = (rand() % 2) * 2 - 1;
 		p1score++;
 	}
 	else if ( player == 2 )
 	{
 		ballvelx = -1;
-		ballvely = -1;
+		ballvely = (rand() % 2) * 2 - 1;
 		p2score++;
 	}
 
+	if ( ballvely > 0 ) { ballvely /= ballvely; }
+	if ( ballvely < 0 ) { ballvely /= -ballvely; }
+
 	System::Sound::SetFrequency(goalfreq);
 	soundleft = 50;
 
@@ -198,8 +204,30 @@ void ReadInput()
 	}
 }
 
+int usage(int argc, char* argv[])
+{
+	printf("usage: %s [OPTIONS]\n", argv[0]);
+	printf("Options:\n");
+	printf("  --speed <miliseconds>    How many miliseconds between updates\n");
+	printf("  --usage                  Display this screen\n");
+	printf("  --help                   Display this screen\n");
+
+	return 0;
+}
+
 int main(int argc, char* argv[])
 {
+	int sleepms = 50;
+	for ( int i = 1; i < argc; i++ )
+	{
+		if ( String::Compare(argv[i], "--help") == 0 ) { return usage(argc, argv); }
+		if ( String::Compare(argv[i], "--usage") == 0 ) { return usage(argc, argv); }
+		if ( String::Compare(argv[i], "--speed") == 0 && 1 < argc-i )
+		{
+			sleepms = String::ToInt(argv[++i]);
+		}
+	}
+
 	int result = Init();
 	if ( result != 0 ) { return result; }
 
@@ -208,7 +236,6 @@ int main(int argc, char* argv[])
 		ReadInput();
 		Update();
 		UpdateUI();
-		const unsigned sleepms = 50;
 		Thread::USleep(sleepms * 1000);
 		if ( soundleft < 0 ) { continue; }
 		if ( soundleft <= 50 )

games/snake.cpp

@@ -4,6 +4,7 @@
 #include <libmaxsi/keyboard.h>
 #include <libmaxsi/sortix-vga.h>
 #include <libmaxsi/sortix-keyboard.h>
+#include <stdlib.h>
 
 using namespace Maxsi;
 using namespace Maxsi::Keyboard;
@@ -36,15 +37,6 @@ const int speedincrease = -5;
 const int maxspeed = 40;
 volatile int speed;
 
-// HACK: Sortix has no random number generator yet!
-int random_seed=1337;
-int rand(int max) 
-{
-	int tmpmax=max;
-	random_seed = random_seed + 37 * 1103515245 + 12345;
-	return (unsigned int) (random_seed / 65536) % tmpmax; 
-}
-
 void Clear()
 {
 	// Reset the game data.
@@ -56,7 +48,7 @@ void Reset()
 	Clear();
 	tailx = posx = width/2;
 	taily = posy = height/2;
-	switch ( rand(4) )
+	switch ( rand() % 4 )
 	{
 		case 0: velx = -1; vely = 0; break;
 		case 1: velx = 1; vely = 0; break; 
@@ -64,8 +56,8 @@ void Reset()
 		case 3: velx = 0; vely = -1; break;
 	}
 
-	animalx = 2 + rand(width-4);
-	animaly = 2 + rand(height-4);
+	animalx = 2 + (rand() % width-4);
+	animaly = 2 + (rand() % height-4);
 
 	taillen = 0;
 	tailmax = 3;
@@ -149,8 +141,8 @@ void Update()
 	if ( newx == animalx && newy == animaly )
 	{
 		tailmax++;
-		animalx = 2 + rand(width-4);
-		animaly = 2 + rand(height-4);
+		animalx = 2 + (rand() % width-4);
+		animaly = 2 + (rand() % height-4);
 		if ( maxspeed < speed ) { speed += speedincrease; }
 	}
 

libmaxsi/Makefile

@@ -55,6 +55,7 @@ thread.o \
 io.o \
 init.o \
 start.o \
+random.o \
 
 HEADERS=\
 error.h \

libmaxsi/c/hsrc/stdlib.h

@@ -50,6 +50,7 @@ void exit(int);
 void _Exit(int status);
 void free(void*);
 void* malloc(size_t);
+int rand(void);
 
 /* TODO: These are not implemented in libmaxsi/sortix yet. */
 #ifndef SORTIX_UNIMPLEMENTED
@@ -90,7 +91,6 @@ int posix_openpt(int);
 char* ptsname(int);
 int putenv(char*);
 void qsort(void*, size_t, size_t, int (*)(const void*, const void*));
-int rand(void);
 long random(void);
 void* realloc(void*, size_t);
 char* realpath(const char* restrict, char* restrict);

libmaxsi/random.cpp

@@ -0,0 +1,39 @@
+/******************************************************************************
+
+	COPYRIGHT(C) JONAS 'SORTIE' TERMANSEN 2011.
+
+	This file is part of LibMaxsi.
+
+	LibMaxsi is free software: you can redistribute it and/or modify it under
+	the terms of the GNU Lesser General Public License as published by the Free
+	Software Foundation, either version 3 of the License, or (at your option)
+	any later version.
+
+	LibMaxsi 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 Lesser General Public License for
+	more details.
+
+	You should have received a copy of the GNU Lesser General Public License
+	along with LibMaxsi. If not, see <http://www.gnu.org/licenses/>.
+
+	random.cpp
+	Provides access to random numbers using various algorithms.
+
+******************************************************************************/
+
+#include "platform.h"
+
+namespace Maxsi
+{
+	namespace Random
+	{
+		int random_seed=1337;
+		extern "C" int rand() 
+		{
+			random_seed = random_seed + 37 * 1103515245 + 12345;
+			return random_seed / 65536; 
+		}
+	}
+}
+