Port of Duke Nukem 3D

This ports Fabien Sanglard's Chocolate Duke to run on a version of SDL
for Rockbox.

Change-Id: I8f2c4c78af19de10c1633ed7bb7a997b43256dd9

apps/plugins/sdl/src/thread/generic/SDL_syscond.c

@@ -0,0 +1,215 @@
+/*
+    SDL - Simple DirectMedia Layer
+    Copyright (C) 1997-2012 Sam Lantinga
+
+    This library 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 2.1 of the License, or (at your option) any later version.
+
+    This library 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 this library; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+    Sam Lantinga
+    slouken@libsdl.org
+*/
+#include "SDL_config.h"
+
+/* An implementation of condition variables using semaphores and mutexes */
+/*
+   This implementation borrows heavily from the BeOS condition variable
+   implementation, written by Christopher Tate and Owen Smith.  Thanks!
+ */
+
+#include "SDL_thread.h"
+
+struct SDL_cond
+{
+	SDL_mutex *lock;
+	int waiting;
+	int signals;
+	SDL_sem *wait_sem;
+	SDL_sem *wait_done;
+};
+
+/* Create a condition variable */
+SDL_cond * SDL_CreateCond(void)
+{
+	SDL_cond *cond;
+
+	cond = (SDL_cond *) SDL_malloc(sizeof(SDL_cond));
+	if ( cond ) {
+		cond->lock = SDL_CreateMutex();
+		cond->wait_sem = SDL_CreateSemaphore(0);
+		cond->wait_done = SDL_CreateSemaphore(0);
+		cond->waiting = cond->signals = 0;
+		if ( ! cond->lock || ! cond->wait_sem || ! cond->wait_done ) {
+			SDL_DestroyCond(cond);
+			cond = NULL;
+		}
+	} else {
+		SDL_OutOfMemory();
+	}
+	return(cond);
+}
+
+/* Destroy a condition variable */
+void SDL_DestroyCond(SDL_cond *cond)
+{
+	if ( cond ) {
+		if ( cond->wait_sem ) {
+			SDL_DestroySemaphore(cond->wait_sem);
+		}
+		if ( cond->wait_done ) {
+			SDL_DestroySemaphore(cond->wait_done);
+		}
+		if ( cond->lock ) {
+			SDL_DestroyMutex(cond->lock);
+		}
+		SDL_free(cond);
+	}
+}
+
+/* Restart one of the threads that are waiting on the condition variable */
+int SDL_CondSignal(SDL_cond *cond)
+{
+	if ( ! cond ) {
+		SDL_SetError("Passed a NULL condition variable");
+		return -1;
+	}
+
+	/* If there are waiting threads not already signalled, then
+	   signal the condition and wait for the thread to respond.
+	*/
+	SDL_LockMutex(cond->lock);
+	if ( cond->waiting > cond->signals ) {
+		++cond->signals;
+		SDL_SemPost(cond->wait_sem);
+		SDL_UnlockMutex(cond->lock);
+		SDL_SemWait(cond->wait_done);
+	} else {
+		SDL_UnlockMutex(cond->lock);
+	}
+
+	return 0;
+}
+
+/* Restart all threads that are waiting on the condition variable */
+int SDL_CondBroadcast(SDL_cond *cond)
+{
+	if ( ! cond ) {
+		SDL_SetError("Passed a NULL condition variable");
+		return -1;
+	}
+
+	/* If there are waiting threads not already signalled, then
+	   signal the condition and wait for the thread to respond.
+	*/
+	SDL_LockMutex(cond->lock);
+	if ( cond->waiting > cond->signals ) {
+		int i, num_waiting;
+
+		num_waiting = (cond->waiting - cond->signals);
+		cond->signals = cond->waiting;
+		for ( i=0; i<num_waiting; ++i ) {
+			SDL_SemPost(cond->wait_sem);
+		}
+		/* Now all released threads are blocked here, waiting for us.
+		   Collect them all (and win fabulous prizes!) :-)
+		 */
+		SDL_UnlockMutex(cond->lock);
+		for ( i=0; i<num_waiting; ++i ) {
+			SDL_SemWait(cond->wait_done);
+		}
+	} else {
+		SDL_UnlockMutex(cond->lock);
+	}
+
+	return 0;
+}
+
+/* Wait on the condition variable for at most 'ms' milliseconds.
+   The mutex must be locked before entering this function!
+   The mutex is unlocked during the wait, and locked again after the wait.
+
+Typical use:
+
+Thread A:
+	SDL_LockMutex(lock);
+	while ( ! condition ) {
+		SDL_CondWait(cond);
+	}
+	SDL_UnlockMutex(lock);
+
+Thread B:
+	SDL_LockMutex(lock);
+	...
+	condition = true;
+	...
+	SDL_UnlockMutex(lock);
+ */
+int SDL_CondWaitTimeout(SDL_cond *cond, SDL_mutex *mutex, Uint32 ms)
+{
+	int retval;
+
+	if ( ! cond ) {
+		SDL_SetError("Passed a NULL condition variable");
+		return -1;
+	}
+
+	/* Obtain the protection mutex, and increment the number of waiters.
+	   This allows the signal mechanism to only perform a signal if there
+	   are waiting threads.
+	 */
+	SDL_LockMutex(cond->lock);
+	++cond->waiting;
+	SDL_UnlockMutex(cond->lock);
+
+	/* Unlock the mutex, as is required by condition variable semantics */
+	SDL_UnlockMutex(mutex);
+
+	/* Wait for a signal */
+	if ( ms == SDL_MUTEX_MAXWAIT ) {
+		retval = SDL_SemWait(cond->wait_sem);
+	} else {
+		retval = SDL_SemWaitTimeout(cond->wait_sem, ms);
+	}
+
+	/* Let the signaler know we have completed the wait, otherwise
+           the signaler can race ahead and get the condition semaphore
+           if we are stopped between the mutex unlock and semaphore wait,
+           giving a deadlock.  See the following URL for details:
+        http://www-classic.be.com/aboutbe/benewsletter/volume_III/Issue40.html
+	*/
+	SDL_LockMutex(cond->lock);
+	if ( cond->signals > 0 ) {
+		/* If we timed out, we need to eat a condition signal */
+		if ( retval > 0 ) {
+			SDL_SemWait(cond->wait_sem);
+		}
+		/* We always notify the signal thread that we are done */
+		SDL_SemPost(cond->wait_done);
+
+		/* Signal handshake complete */
+		--cond->signals;
+	}
+	--cond->waiting;
+	SDL_UnlockMutex(cond->lock);
+
+	/* Lock the mutex, as is required by condition variable semantics */
+	SDL_LockMutex(mutex);
+
+	return retval;
+}
+
+/* Wait on the condition variable forever */
+int SDL_CondWait(SDL_cond *cond, SDL_mutex *mutex)
+{
+	return SDL_CondWaitTimeout(cond, mutex, SDL_MUTEX_MAXWAIT);
+}

apps/plugins/sdl/src/thread/generic/SDL_sysmutex.c

@@ -0,0 +1,129 @@
+/*
+    SDL - Simple DirectMedia Layer
+    Copyright (C) 1997-2012 Sam Lantinga
+
+    This library 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 2.1 of the License, or (at your option) any later version.
+
+    This library 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 this library; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+    Sam Lantinga
+    slouken@libsdl.org
+*/
+#include "SDL_config.h"
+
+/* An implementation of mutexes using semaphores */
+
+#include "SDL_thread.h"
+#include "SDL_systhread_c.h"
+
+
+struct SDL_mutex {
+	int recursive;
+	Uint32 owner;
+	SDL_sem *sem;
+};
+
+/* Create a mutex */
+SDL_mutex *SDL_CreateMutex(void)
+{
+	SDL_mutex *mutex;
+
+	/* Allocate mutex memory */
+	mutex = (SDL_mutex *)SDL_malloc(sizeof(*mutex));
+	if ( mutex ) {
+		/* Create the mutex semaphore, with initial value 1 */
+		mutex->sem = SDL_CreateSemaphore(1);
+		mutex->recursive = 0;
+		mutex->owner = 0;
+		if ( ! mutex->sem ) {
+			SDL_free(mutex);
+			mutex = NULL;
+		}
+	} else {
+		SDL_OutOfMemory();
+	}
+	return mutex;
+}
+
+/* Free the mutex */
+void SDL_DestroyMutex(SDL_mutex *mutex)
+{
+	if ( mutex ) {
+		if ( mutex->sem ) {
+			SDL_DestroySemaphore(mutex->sem);
+		}
+		SDL_free(mutex);
+	}
+}
+
+/* Lock the semaphore */
+int SDL_mutexP(SDL_mutex *mutex)
+{
+#if SDL_THREADS_DISABLED
+	return 0;
+#else
+	Uint32 this_thread;
+
+	if ( mutex == NULL ) {
+		SDL_SetError("Passed a NULL mutex");
+		return -1;
+	}
+
+	this_thread = SDL_ThreadID();
+	if ( mutex->owner == this_thread ) {
+		++mutex->recursive;
+	} else {
+		/* The order of operations is important.
+		   We set the locking thread id after we obtain the lock
+		   so unlocks from other threads will fail.
+		*/
+		SDL_SemWait(mutex->sem);
+		mutex->owner = this_thread;
+		mutex->recursive = 0;
+	}
+
+	return 0;
+#endif /* SDL_THREADS_DISABLED */
+}
+
+/* Unlock the mutex */
+int SDL_mutexV(SDL_mutex *mutex)
+{
+#if SDL_THREADS_DISABLED
+	return 0;
+#else
+	if ( mutex == NULL ) {
+		SDL_SetError("Passed a NULL mutex");
+		return -1;
+	}
+
+	/* If we don't own the mutex, we can't unlock it */
+	if ( SDL_ThreadID() != mutex->owner ) {
+		SDL_SetError("mutex not owned by this thread");
+		return -1;
+	}
+
+	if ( mutex->recursive ) {
+		--mutex->recursive;
+	} else {
+		/* The order of operations is important.
+		   First reset the owner so another thread doesn't lock
+		   the mutex and set the ownership before we reset it,
+		   then release the lock semaphore.
+		 */
+		mutex->owner = 0;
+		SDL_SemPost(mutex->sem);
+	}
+	return 0;
+#endif /* SDL_THREADS_DISABLED */
+}

apps/plugins/sdl/src/thread/generic/SDL_sysmutex_c.h

@@ -0,0 +1,23 @@
+/*
+    SDL - Simple DirectMedia Layer
+    Copyright (C) 1997-2012 Sam Lantinga
+
+    This library 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 2.1 of the License, or (at your option) any later version.
+
+    This library 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 this library; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+    Sam Lantinga
+    slouken@libsdl.org
+*/
+#include "SDL_config.h"
+

apps/plugins/sdl/src/thread/generic/SDL_syssem.c

@@ -0,0 +1,211 @@
+/*
+    SDL - Simple DirectMedia Layer
+    Copyright (C) 1997-2012 Sam Lantinga
+
+    This library 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 2.1 of the License, or (at your option) any later version.
+
+    This library 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 this library; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+    Sam Lantinga
+    slouken@libsdl.org
+*/
+#include "SDL_config.h"
+
+/* An implementation of semaphores using mutexes and condition variables */
+
+#include "SDL_timer.h"
+#include "SDL_thread.h"
+#include "SDL_systhread_c.h"
+
+
+#if SDL_THREADS_DISABLED
+
+SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
+{
+	SDL_SetError("SDL not configured with thread support");
+	return (SDL_sem *)0;
+}
+
+void SDL_DestroySemaphore(SDL_sem *sem)
+{
+	return;
+}
+
+int SDL_SemTryWait(SDL_sem *sem)
+{
+	SDL_SetError("SDL not configured with thread support");
+	return -1;
+}
+
+int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
+{
+	SDL_SetError("SDL not configured with thread support");
+	return -1;
+}
+
+int SDL_SemWait(SDL_sem *sem)
+{
+	SDL_SetError("SDL not configured with thread support");
+	return -1;
+}
+
+Uint32 SDL_SemValue(SDL_sem *sem)
+{
+	return 0;
+}
+
+int SDL_SemPost(SDL_sem *sem)
+{
+	SDL_SetError("SDL not configured with thread support");
+	return -1;
+}
+
+#else
+
+struct SDL_semaphore
+{
+	Uint32 count;
+	Uint32 waiters_count;
+	SDL_mutex *count_lock;
+	SDL_cond *count_nonzero;
+};
+
+SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
+{
+	SDL_sem *sem;
+
+	sem = (SDL_sem *)SDL_malloc(sizeof(*sem));
+	if ( ! sem ) {
+		SDL_OutOfMemory();
+		return NULL;
+	}
+	sem->count = initial_value;
+	sem->waiters_count = 0;
+
+	sem->count_lock = SDL_CreateMutex();
+	sem->count_nonzero = SDL_CreateCond();
+	if ( ! sem->count_lock || ! sem->count_nonzero ) {
+		SDL_DestroySemaphore(sem);
+		return NULL;
+	}
+
+	return sem;
+}
+
+/* WARNING:
+   You cannot call this function when another thread is using the semaphore.
+*/
+void SDL_DestroySemaphore(SDL_sem *sem)
+{
+	if ( sem ) {
+		sem->count = 0xFFFFFFFF;
+		while ( sem->waiters_count > 0) {
+			SDL_CondSignal(sem->count_nonzero);
+			SDL_Delay(10);
+		}
+		SDL_DestroyCond(sem->count_nonzero);
+		if ( sem->count_lock ) {
+			SDL_mutexP(sem->count_lock);
+			SDL_mutexV(sem->count_lock);
+			SDL_DestroyMutex(sem->count_lock);
+		}
+		SDL_free(sem);
+	}
+}
+
+int SDL_SemTryWait(SDL_sem *sem)
+{
+	int retval;
+
+	if ( ! sem ) {
+		SDL_SetError("Passed a NULL semaphore");
+		return -1;
+	}
+
+	retval = SDL_MUTEX_TIMEDOUT;
+	SDL_LockMutex(sem->count_lock);
+	if ( sem->count > 0 ) {
+		--sem->count;
+		retval = 0;
+	}
+	SDL_UnlockMutex(sem->count_lock);
+
+	return retval;
+}
+
+int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
+{
+	int retval;
+
+	if ( ! sem ) {
+		SDL_SetError("Passed a NULL semaphore");
+		return -1;
+	}
+
+	/* A timeout of 0 is an easy case */
+	if ( timeout == 0 ) {
+		return SDL_SemTryWait(sem);
+	}
+
+	SDL_LockMutex(sem->count_lock);
+	++sem->waiters_count;
+	retval = 0;
+	while ( (sem->count == 0) && (retval != SDL_MUTEX_TIMEDOUT) ) {
+		retval = SDL_CondWaitTimeout(sem->count_nonzero,
+		                             sem->count_lock, timeout);
+	}
+	--sem->waiters_count;
+	if (retval == 0) {
+		--sem->count;
+	}
+	SDL_UnlockMutex(sem->count_lock);
+
+	return retval;
+}
+
+int SDL_SemWait(SDL_sem *sem)
+{
+	return SDL_SemWaitTimeout(sem, SDL_MUTEX_MAXWAIT);
+}
+
+Uint32 SDL_SemValue(SDL_sem *sem)
+{
+	Uint32 value;
+	
+	value = 0;
+	if ( sem ) {
+		SDL_LockMutex(sem->count_lock);
+		value = sem->count;
+		SDL_UnlockMutex(sem->count_lock);
+	}
+	return value;
+}
+
+int SDL_SemPost(SDL_sem *sem)
+{
+	if ( ! sem ) {
+		SDL_SetError("Passed a NULL semaphore");
+		return -1;
+	}
+
+	SDL_LockMutex(sem->count_lock);
+	if ( sem->waiters_count > 0 ) {
+		SDL_CondSignal(sem->count_nonzero);
+	}
+	++sem->count;
+	SDL_UnlockMutex(sem->count_lock);
+
+	return 0;
+}
+
+#endif /* SDL_THREADS_DISABLED */

apps/plugins/sdl/src/thread/generic/SDL_systhread.c

@@ -0,0 +1,54 @@
+/*
+    SDL - Simple DirectMedia Layer
+    Copyright (C) 1997-2012 Sam Lantinga
+
+    This library 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 2.1 of the License, or (at your option) any later version.
+
+    This library 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 this library; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+    Sam Lantinga
+    slouken@libsdl.org
+*/
+#include "SDL_config.h"
+
+/* Thread management routines for SDL */
+
+#include "SDL_thread.h"
+#include "../SDL_systhread.h"
+
+int SDL_SYS_CreateThread(SDL_Thread *thread, void *args)
+{
+	SDL_SetError("Threads are not supported on this platform");
+	return(-1);
+}
+
+void SDL_SYS_SetupThread(void)
+{
+	return;
+}
+
+Uint32 SDL_ThreadID(void)
+{
+	return(0);
+}
+
+void SDL_SYS_WaitThread(SDL_Thread *thread)
+{
+	return;
+}
+
+void SDL_SYS_KillThread(SDL_Thread *thread)
+{
+	return;
+}
+

apps/plugins/sdl/src/thread/generic/SDL_systhread_c.h

@@ -0,0 +1,25 @@
+/*
+    SDL - Simple DirectMedia Layer
+    Copyright (C) 1997-2012 Sam Lantinga
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Library General Public
+    License as published by the Free Software Foundation; either
+    version 2 of the License, or (at your option) any later version.
+
+    This library 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
+    Library General Public License for more details.
+
+    You should have received a copy of the GNU Library General Public
+    License along with this library; if not, write to the Free
+    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+    Sam Lantinga
+    slouken@libsdl.org
+*/
+#include "SDL_config.h"
+
+/* Stub until we implement threads on this platform */
+typedef int SYS_ThreadHandle;