iPod Linux framebuffer support.

--ryan.


Date: Sun, 19 Jun 2005 15:53:22 -0700
From: Joshua Oreman <oremanj@gmail.com>
To: sdl@libsdl.org
Subject: [SDL] [PATCH] iPod framebuffer video driver

Hi SDL-list,

I've been working on a port of SDL to iPodLinux
(http://www.ipodlinux.org).  I've created a patch for both the
standard 2-bit iPod screen (using an unchangeable palette) and the
16-bit iPod photo.  The patch is attached, against version 1.2.8.

I've created two pages on the iPodLinux wiki about this patch:
http://www.ipodlinux.org/Building_SDL and
http://www.ipodlinux.org/SDL_Programming. See those pages if you're
curious.

Comments? Questions? Is this something that might be able to get into SDL 1.2.9?

Thanks for your feedback!
-- Josh

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%401143

configure.in

@@ -549,6 +549,20 @@ CheckNASM()
     fi
 }
 
+dnl Do the iPod thing
+CheckIPod()
+{
+    AC_ARG_ENABLE(ipod,
+[  --enable-ipod          configure SDL to work with iPodLinux [default=yes on arm-elf]],
+	, enable_ipod=yes)
+
+    if test x$enable_ipod = xyes; then
+	CFLAGS="$CFLAGS -DENABLE_IPOD -DIPOD"
+	VIDEO_SUBDIRS="$VIDEO_SUBDIRS ipod"
+	VIDEO_DRIVERS="$VIDEO_DRIVERS ipod/libvideo_ipod.la"
+    fi
+}	
+
 dnl Find the nanox include and library directories
 CheckNANOX()
 {
@@ -1306,7 +1320,7 @@ CheckPTHREAD()
             pthread_lib="-lpthread"
             ;;
     esac
-    if test x$enable_threads = xyes -a x$enable_pthreads = xyes; then
+    if test x$enable_threads = xyes -a x$enable_pthreads = xyes -a x$enable_ipod != xyes; then
         # Save the original compiler flags and libraries
         ac_save_cflags="$CFLAGS"; ac_save_libs="$LIBS"
         # Add the pthread compiler flags and libraries
@@ -1932,6 +1946,15 @@ CheckRPATH()
 }
 
 case "$target" in
+    arm-*-elf*)
+	ARCH=linux
+	CheckDummyVideo
+	CheckIPod
+	# Set up files for the timer library
+        if test x$enable_timers = xyes; then
+            COPY_ARCH_SRC(src/timer, linux, SDL_systimer.c)
+        fi
+	;;
     *-*-linux*|*-*-gnu*|*-*-k*bsd*-gnu)
         case "$target" in
           *-*-linux*) ARCH=linux ;;
@@ -2810,6 +2833,7 @@ AM_CONDITIONAL(TARGET_MACOS, test $ARCH = macos)
 AM_CONDITIONAL(TARGET_MACOSX, test $ARCH = macosx)
 AM_CONDITIONAL(TARGET_QNX, test $ARCH = qnx)
 AM_CONDITIONAL(TARGET_MINT, test $ARCH = mint)
+AM_CONDITIONAL(TARGET_IPOD, test x$enable_ipod = xyes)
 
 # More automake conditionals
 AM_CONDITIONAL(USE_DIRECTX, test x$use_directx = xyes)
@@ -2989,6 +3013,7 @@ src/video/epoc/Makefile
 src/video/fbcon/Makefile
 src/video/gem/Makefile
 src/video/ggi/Makefile
+src/video/ipod/Makefile
 src/video/maccommon/Makefile
 src/video/macdsp/Makefile
 src/video/macrom/Makefile

src/events/SDL_events.c

@@ -181,7 +181,9 @@ static void SDL_StopEventThread(void)
 		SDL_EventThread = NULL;
 		SDL_DestroyMutex(SDL_EventLock.lock);
 	}
+#ifndef IPOD
 	SDL_DestroyMutex(SDL_EventQ.lock);
+#endif
 }
 
 Uint32 SDL_EventThreadID(void)

src/events/SDL_sysevents.h

@@ -37,6 +37,10 @@ static char rcsid =
 #define CANT_THREAD_EVENTS
 #endif
 
+#ifdef IPOD			/* iPod doesn't support threading at all */
+#define CANT_THREAD_EVENTS
+#endif
+
 #ifdef macintosh	/* MacOS 7/8 don't support preemptive multi-tasking */
 #define CANT_THREAD_EVENTS
 #endif

src/video/SDL_cursor.c

@@ -74,7 +74,9 @@ void SDL_CursorQuit(void)
 int SDL_CursorInit(Uint32 multithreaded)
 {
 	/* We don't have mouse focus, and the cursor isn't drawn yet */
+#ifndef IPOD
 	SDL_cursorstate = CURSOR_VISIBLE;
+#endif
 
 	/* Create the default cursor */
 	if ( SDL_defcursor == NULL ) {

src/video/SDL_sysvideo.h

@@ -341,6 +341,9 @@ extern VideoBootStrap DGA_bootstrap;
 #ifdef ENABLE_NANOX
 extern VideoBootStrap NX_bootstrap;
 #endif
+#ifdef ENABLE_IPOD
+extern VideoBootStrap iPod_bootstrap;
+#endif
 #ifdef ENABLE_FBCON
 extern VideoBootStrap FBCON_bootstrap;
 #endif

src/video/SDL_video.c

@@ -57,6 +57,9 @@ static VideoBootStrap *bootstrap[] = {
 #ifdef ENABLE_NANOX
 	&NX_bootstrap,
 #endif
+#ifdef ENABLE_IPOD
+	&iPod_bootstrap,
+#endif
 #ifdef ENABLE_QTOPIA
 	&Qtopia_bootstrap,
 #endif

src/video/ipod/Makefile.am

@@ -0,0 +1,5 @@
+
+## Makefile.am for SDL using the iPod framebuffer driver
+
+noinst_LTLIBRARIES = libvideo_ipod.la
+libvideo_ipod_la_SOURCES = SDL_ipodvideo.c SDL_ipodvideo.h

src/video/ipod/SDL_ipodvideo.c

@@ -0,0 +1,710 @@
+#include <sys/types.h>
+#include <sys/ioctl.h>
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <string.h>
+#include <termios.h>
+#include <ctype.h>
+
+#include <linux/vt.h>
+#include <linux/kd.h>
+#include <linux/keyboard.h>
+#include <linux/fb.h>
+
+#include "SDL.h"
+#include "SDL_error.h"
+#include "SDL_video.h"
+#include "SDL_mouse.h"
+#include "SDL_sysvideo.h"
+#include "SDL_pixels_c.h"
+#include "SDL_events_c.h"
+#include "SDL_sysevents.h"
+#include "SDL_ipodvideo.h"
+
+#define _THIS SDL_VideoDevice *this
+
+static int iPod_VideoInit (_THIS, SDL_PixelFormat *vformat);
+static SDL_Rect **iPod_ListModes (_THIS, SDL_PixelFormat *format, Uint32 flags);
+static SDL_Surface *iPod_SetVideoMode (_THIS, SDL_Surface *current, int width, int height, int bpp, Uint32 flags);
+static int iPod_SetColors (_THIS, int firstcolor, int ncolors, SDL_Color *colors);
+static void iPod_UpdateRects (_THIS, int nrects, SDL_Rect *rects);
+static void iPod_VideoQuit (_THIS);
+static void iPod_PumpEvents (_THIS);
+
+static long iPod_GetGeneration();
+
+static int initd = 0;
+static int kbfd = -1;
+static int fbfd = -1;
+static int oldvt = -1;
+static int curvt = -1;
+static int old_kbmode = -1;
+static long generation = 0;
+static struct termios old_termios, cur_termios;
+
+FILE *dbgout;
+
+#define LCD_DATA          0x10
+#define LCD_CMD           0x08
+#define IPOD_OLD_LCD_BASE 0xc0001000
+#define IPOD_OLD_LCD_RTC  0xcf001110
+#define IPOD_NEW_LCD_BASE 0x70003000
+#define IPOD_NEW_LCD_RTC  0x60005010
+
+static unsigned long lcd_base, lcd_rtc, lcd_width, lcd_height;
+
+static long iPod_GetGeneration() 
+{
+    int i;
+    char cpuinfo[256];
+    char *ptr;
+    FILE *file;
+    
+    if ((file = fopen("/proc/cpuinfo", "r")) != NULL) {
+	while (fgets(cpuinfo, sizeof(cpuinfo), file) != NULL)
+	    if (strncmp(cpuinfo, "Revision", 8) == 0)
+		break;
+	fclose(file);
+    }
+    for (i = 0; !isspace(cpuinfo[i]); i++);
+    for (; isspace(cpuinfo[i]); i++);
+    ptr = cpuinfo + i + 2;
+    
+    return strtol(ptr, NULL, 10);
+}
+
+static int iPod_Available() 
+{
+    return 1;
+}
+
+static void iPod_DeleteDevice (SDL_VideoDevice *device)
+{
+    free (device->hidden);
+    free (device);
+}
+
+void iPod_InitOSKeymap (_THIS) {}
+
+static SDL_VideoDevice *iPod_CreateDevice (int devindex)
+{
+    SDL_VideoDevice *this;
+    
+    this = (SDL_VideoDevice *)malloc (sizeof(SDL_VideoDevice));
+    if (this) {
+	memset (this, 0, sizeof *this);
+	this->hidden = (struct SDL_PrivateVideoData *) malloc (sizeof(struct SDL_PrivateVideoData));
+    }
+    if (!this || !this->hidden) {
+	SDL_OutOfMemory();
+	if (this)
+	    free (this);
+	return 0;
+    }
+    memset (this->hidden, 0, sizeof(struct SDL_PrivateVideoData));
+    
+    generation = iPod_GetGeneration();
+
+    this->VideoInit = iPod_VideoInit;
+    this->ListModes = iPod_ListModes;
+    this->SetVideoMode = iPod_SetVideoMode;
+    this->SetColors = iPod_SetColors;
+    this->UpdateRects = iPod_UpdateRects;
+    this->VideoQuit = iPod_VideoQuit;
+    this->AllocHWSurface = 0;
+    this->CheckHWBlit = 0;
+    this->FillHWRect = 0;
+    this->SetHWColorKey = 0;
+    this->SetHWAlpha = 0;
+    this->LockHWSurface = 0;
+    this->UnlockHWSurface = 0;
+    this->FlipHWSurface = 0;
+    this->FreeHWSurface = 0;
+    this->SetCaption = 0;
+    this->SetIcon = 0;
+    this->IconifyWindow = 0;
+    this->GrabInput = 0;
+    this->GetWMInfo = 0;
+    this->InitOSKeymap = iPod_InitOSKeymap;
+    this->PumpEvents = iPod_PumpEvents;
+    this->free = iPod_DeleteDevice;
+
+    return this;
+}
+
+VideoBootStrap iPod_bootstrap = {
+    "ipod", "iPod Framebuffer Driver",
+    iPod_Available, iPod_CreateDevice
+};
+
+//--//
+
+static int iPod_VideoInit (_THIS, SDL_PixelFormat *vformat)
+{
+    if (!initd) {
+	/*** Code adapted/copied from SDL fbcon driver. ***/
+
+	static const char * const tty0[] = { "/dev/tty0", "/dev/vc/0", 0 };
+	static const char * const vcs[] = { "/dev/vc/%d", "/dev/tty%d", 0 };
+	int i, tty0_fd;
+
+	dbgout = fdopen (open ("/etc/sdlpod.log", O_WRONLY | O_SYNC | O_APPEND), "a");
+	if (dbgout) {
+	    setbuf (dbgout, 0);
+	    fprintf (dbgout, "--> Started SDL <--\n");
+	}
+
+	// Try to query for a free VT
+	tty0_fd = -1;
+	for ( i=0; tty0[i] && (tty0_fd < 0); ++i ) {
+	    tty0_fd = open(tty0[i], O_WRONLY, 0);
+	}
+	if ( tty0_fd < 0 ) {
+	    tty0_fd = dup(0); /* Maybe stdin is a VT? */
+	}
+	ioctl(tty0_fd, VT_OPENQRY, &curvt);
+	close(tty0_fd);
+
+	tty0_fd = open("/dev/tty", O_RDWR, 0);
+	if ( tty0_fd >= 0 ) {
+	    ioctl(tty0_fd, TIOCNOTTY, 0);
+	    close(tty0_fd);
+	}
+
+	if ( (geteuid() == 0) && (curvt > 0) ) {
+	    for ( i=0; vcs[i] && (kbfd < 0); ++i ) {
+		char vtpath[12];
+		
+		sprintf(vtpath, vcs[i], curvt);
+		kbfd = open(vtpath, O_RDWR);
+	    }
+	}
+	if ( kbfd < 0 ) {
+	    if (dbgout) fprintf (dbgout, "Couldn't open any VC\n");
+	    return -1;
+	}
+	if (dbgout) fprintf (stderr, "Current VT: %d\n", curvt);
+
+	if (kbfd >= 0) {
+	    /* Switch to the correct virtual terminal */
+	    if ( curvt > 0 ) {
+		struct vt_stat vtstate;
+		
+		if ( ioctl(kbfd, VT_GETSTATE, &vtstate) == 0 ) {
+		    oldvt = vtstate.v_active;
+		}
+		if ( ioctl(kbfd, VT_ACTIVATE, curvt) == 0 ) {
+		    if (dbgout) fprintf (dbgout, "Waiting for switch to this VT... ");
+		    ioctl(kbfd, VT_WAITACTIVE, curvt);
+		    if (dbgout) fprintf (dbgout, "done!\n");
+		}
+	    }
+
+	    // Set terminal input mode
+	    if (tcgetattr (kbfd, &old_termios) < 0) {
+		if (dbgout) fprintf (dbgout, "Can't get termios\n");
+		return -1;
+	    }
+	    cur_termios = old_termios;
+	    //	    cur_termios.c_iflag &= ~(ICRNL | INPCK | ISTRIP | IXON);
+	    //	    cur_termios.c_iflag |= (BRKINT);
+	    //	    cur_termios.c_lflag &= ~(ICANON | ECHO | ISIG | IEXTEN);
+	    //	    cur_termios.c_oflag &= ~(OPOST);
+	    //	    cur_termios.c_oflag |= (ONOCR | ONLRET);
+	    cur_termios.c_lflag &= ~(ICANON | ECHO | ISIG);
+	    cur_termios.c_iflag &= ~(ISTRIP | IGNCR | ICRNL | INLCR | IXOFF | IXON);
+	    cur_termios.c_cc[VMIN] = 0;
+	    cur_termios.c_cc[VTIME] = 0;
+	    
+	    if (tcsetattr (kbfd, TCSAFLUSH, &cur_termios) < 0) {
+		if (dbgout) fprintf (dbgout, "Can't set termios\n");
+		return -1;
+	    }
+	    if (ioctl (kbfd, KDSKBMODE, K_MEDIUMRAW) < 0) {
+		if (dbgout) fprintf (dbgout, "Can't set medium-raw mode\n");
+		return -1;
+	    }
+	    if (ioctl (kbfd, KDSETMODE, KD_GRAPHICS) < 0) {
+		if (dbgout) fprintf (dbgout, "Can't set graphics\n");
+		return -1;
+	    }
+	}
+
+	// Open the framebuffer
+	if ((fbfd = open ("/dev/fb0", O_RDWR)) < 0) {
+	    if (dbgout) fprintf (dbgout, "Can't open framebuffer\n");
+	    return -1;
+	} else {
+	    struct fb_var_screeninfo vinfo;
+
+	    if (dbgout) fprintf (dbgout, "Generation: %ld\n", generation);
+
+	    if (generation >= 40000) {
+		lcd_base = IPOD_NEW_LCD_BASE;
+	    } else {
+		lcd_base = IPOD_OLD_LCD_BASE;
+	    }
+	    
+	    ioctl (fbfd, FBIOGET_VSCREENINFO, &vinfo);
+	    close (fbfd);
+
+	    if (lcd_base == IPOD_OLD_LCD_BASE)
+		lcd_rtc = IPOD_OLD_LCD_RTC;
+	    else if (lcd_base == IPOD_NEW_LCD_BASE)
+		lcd_rtc = IPOD_NEW_LCD_RTC;
+	    else {
+		SDL_SetError ("Unknown iPod version");
+		return -1;
+	    }
+
+	    lcd_width = vinfo.xres;
+	    lcd_height = vinfo.yres;
+
+	    if (dbgout) fprintf (dbgout, "LCD is %dx%d\n", lcd_width, lcd_height);
+	}
+
+	fcntl (kbfd, F_SETFL, O_RDWR | O_NONBLOCK);
+
+	if ((generation >= 60000) && (generation < 70000)) {
+	    vformat->BitsPerPixel = 16;
+	    vformat->Rmask = 0xF800;
+	    vformat->Gmask = 0x07E0;
+	    vformat->Bmask = 0x001F;
+	} else {
+	    vformat->BitsPerPixel = 8;
+	    vformat->Rmask = vformat->Gmask = vformat->Bmask = 0;
+	}
+
+	initd = 1;
+	if (dbgout) fprintf (dbgout, "Initialized.\n\n");
+    }
+    return 0;
+}
+
+static SDL_Rect **iPod_ListModes (_THIS, SDL_PixelFormat *format, Uint32 flags)
+{
+    int width, height, fd;
+    static SDL_Rect r;
+    static SDL_Rect *rs[2] = { &r, 0 };
+
+    if ((fd = open ("/dev/fb0", O_RDWR)) < 0) {
+	return 0;
+    } else {
+	struct fb_var_screeninfo vinfo;
+	
+	ioctl (fbfd, FBIOGET_VSCREENINFO, &vinfo);
+	close (fbfd);
+	
+	width = vinfo.xres;
+	height = vinfo.yres;
+    }
+    r.x = r.y = 0;
+    r.w = width;
+    r.h = height;
+    return rs;
+}
+
+
+static SDL_Surface *iPod_SetVideoMode (_THIS, SDL_Surface *current, int width, int height, int bpp,
+				       Uint32 flags)
+{
+    Uint32 Rmask, Gmask, Bmask;
+    if (bpp > 8) {
+	Rmask = 0xF800;
+	Gmask = 0x07E0;
+	Bmask = 0x001F;	
+    } else {
+	Rmask = Gmask = Bmask = 0;
+    }
+
+    if (this->hidden->buffer) free (this->hidden->buffer);
+    this->hidden->buffer = malloc (width * height * (bpp / 8));
+    if (!this->hidden->buffer) {
+	SDL_SetError ("Couldn't allocate buffer for requested mode");
+	return 0;
+    }
+
+    memset (this->hidden->buffer, 0, width * height * (bpp / 8));
+
+    if (!SDL_ReallocFormat (current, bpp, Rmask, Gmask, Bmask, 0)) {
+	SDL_SetError ("Couldn't allocate new pixel format");
+	free (this->hidden->buffer);
+	this->hidden->buffer = 0;
+	return 0;
+    }
+
+    if (bpp <= 8) {
+	int i, j;
+	for (i = 0; i < 256; i += 4) {
+	    for (j = 0; j < 4; j++) {
+		current->format->palette->colors[i+j].r = 85 * j;
+		current->format->palette->colors[i+j].g = 85 * j;
+		current->format->palette->colors[i+j].b = 85 * j;
+	    }
+	}
+    }
+
+    current->flags = flags & SDL_FULLSCREEN;
+    this->hidden->w = current->w = width;
+    this->hidden->h = current->h = height;
+    current->pitch = current->w * (bpp / 8);
+    current->pixels = this->hidden->buffer;
+
+    return current;
+}
+
+static int iPod_SetColors (_THIS, int firstcolor, int ncolors, SDL_Color *colors)
+{
+    if (SDL_VideoSurface && SDL_VideoSurface->format && SDL_VideoSurface->format->palette) {
+	int i, j;
+	for (i = 0; i < 256; i += 4) {
+	    for (j = 0; j < 4; j++) {
+		SDL_VideoSurface->format->palette->colors[i+j].r = 85 * j;
+		SDL_VideoSurface->format->palette->colors[i+j].g = 85 * j;
+		SDL_VideoSurface->format->palette->colors[i+j].b = 85 * j;
+	    }
+	}
+    }
+    return 0;
+}
+
+static void iPod_VideoQuit (_THIS)
+{
+    ioctl (kbfd, KDSETMODE, KD_TEXT);
+    tcsetattr (kbfd, TCSAFLUSH, &old_termios);
+    old_kbmode = -1;
+
+    if (oldvt > 0)
+	ioctl (kbfd, VT_ACTIVATE, oldvt);
+    
+    if (kbfd > 0)
+	close (kbfd);
+
+    if (dbgout) {
+	fprintf (dbgout, "<-- Ended SDL -->\n");
+	fclose (dbgout);
+    }
+    
+    kbfd = -1;
+}
+
+static char iPod_SC_keymap[] = {
+    0,				/* 0 - no key */
+    '[' - 0x40,			/* ESC (Ctrl+[) */
+    '1', '2', '3', '4', '5', '6', '7', '8', '9',
+    '-', '=',
+    '\b', '\t',			/* Backspace, Tab (Ctrl+H,Ctrl+I) */
+    'q', 'w', 'e', 'r', 't', 'y', 'u', 'i', 'o', 'p', '[', ']',
+    '\n', 0,			/* Enter, Left CTRL */
+    'a', 's', 'd', 'f', 'g', 'h', 'j', 'k', 'l', ';', '\'', '`',
+    0, '\\',			/* left shift, backslash */
+    'z', 'x', 'c', 'v', 'b', 'n', 'm', ',', '.', '/',
+    0, '*', 0, ' ', 0,		/* right shift, KP mul, left alt, space, capslock */
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* F1-10 */
+    0, 0,			/* numlock, scrollock */
+    '7', '8', '9', '-', '4', '5', '6', '+', '1', '2', '3', '0', '.', /* numeric keypad */
+    0, 0,			/* padding */
+    0, 0, 0,			/* "less" (?), F11, F12 */
+    0, 0, 0, 0, 0, 0, 0,	/* padding */
+    '\n', 0, '/', 0, 0,	/* KP enter, Rctrl, Ctrl, KP div, PrtSc, RAlt */
+    0, 0, 0, 0, 0, 0, 0, 0, 0,	/* Break, Home, Up, PgUp, Left, Right, End, Down, PgDn */
+    0, 0,			/* Ins, Del */
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* padding */
+    0, 0,			/* RWin, LWin */
+    0				/* no key */
+};
+    
+
+static void iPod_keyboard() 
+{
+    unsigned char keybuf[128];
+    int i, nread;
+    SDL_keysym keysym;
+    SDL_Event ev;
+
+    keysym.mod = 0;
+    keysym.scancode = 0xff;
+    memset (&ev, 0, sizeof(SDL_Event));
+
+    nread = read (kbfd, keybuf, 128);
+    for (i = 0; i < nread; i++) {
+	char ascii = iPod_SC_keymap[keybuf[i] & 0x7f];
+
+	if (dbgout) fprintf (dbgout, "Key! %02x is %c %s", keybuf[i], ascii, (keybuf[i] & 0x80)? "up" : "down");
+
+	keysym.sym = keysym.unicode = ascii;
+	ev.type = (keybuf[i] & 0x80)? SDL_KEYUP : SDL_KEYDOWN;
+	ev.key.state = 0;
+	ev.key.keysym = keysym;
+	SDL_PushEvent (&ev);
+    }
+}
+
+static void iPod_PumpEvents (_THIS) 
+{
+    fd_set fdset;
+    int max_fd = 0;
+    static struct timeval zero;
+    int posted;
+
+    do {
+	posted = 0;
+
+	FD_ZERO (&fdset);
+	if (kbfd >= 0) {
+	    FD_SET (kbfd, &fdset);
+	    max_fd = kbfd;
+	}
+	if (dbgout) fprintf (dbgout, "Selecting");
+	if (select (max_fd + 1, &fdset, 0, 0, &zero) > 0) {
+	    if (dbgout) fprintf (dbgout, " -> match!\n");
+	    iPod_keyboard();
+	    posted++;
+	}
+	if (dbgout) fprintf (dbgout, "\n");
+    } while (posted);
+}
+
+// enough space for 160x128x2
+static char ipod_scr[160 * (128/4)];
+
+#define outl(datum,addr) (*(volatile unsigned long *)(addr) = (datum))
+#define inl(addr) (*(volatile unsigned long *)(addr))
+
+/*** The following LCD code is taken from Linux kernel uclinux-2.4.24-uc0-ipod2,
+     file arch/armnommu/mach-ipod/fb.c. A few modifications have been made. ***/
+
+/* get current usec counter */
+static int M_timer_get_current(void)
+{
+	return inl(lcd_rtc);
+}
+
+/* check if number of useconds has past */
+static int M_timer_check(int clock_start, int usecs)
+{
+	unsigned long clock;
+	clock = inl(lcd_rtc);
+	
+	if ( (clock - clock_start) >= usecs ) {
+		return 1;
+	} else {
+		return 0;
+	}
+}
+
+/* wait for LCD with timeout */
+static void M_lcd_wait_write(void)
+{
+	if ( (inl(lcd_base) & 0x8000) != 0 ) {
+		int start = M_timer_get_current();
+			
+		do {
+			if ( (inl(lcd_base) & (unsigned int)0x8000) == 0 ) 
+				break;
+		} while ( M_timer_check(start, 1000) == 0 );
+	}
+}
+
+
+/* send LCD data */
+static void M_lcd_send_data(int data_lo, int data_hi)
+{
+	M_lcd_wait_write();
+	
+	outl(data_lo, lcd_base + LCD_DATA);
+		
+	M_lcd_wait_write();
+	
+	outl(data_hi, lcd_base + LCD_DATA);
+
+}
+
+/* send LCD command */
+static void
+M_lcd_prepare_cmd(int cmd)
+{
+	M_lcd_wait_write();
+
+	outl(0x0, lcd_base + LCD_CMD);
+
+	M_lcd_wait_write();
+	
+	outl(cmd, lcd_base + LCD_CMD);
+	
+}
+
+/* send LCD command and data */
+static void M_lcd_cmd_and_data(int cmd, int data_lo, int data_hi)
+{
+	M_lcd_prepare_cmd(cmd);
+
+	M_lcd_send_data(data_lo, data_hi);
+}
+
+// Copied from uW
+static void M_update_display(int sx, int sy, int mx, int my)
+{
+	int y;
+	unsigned short cursor_pos;
+
+	sx >>= 3;
+	mx >>= 3;
+
+	cursor_pos = sx + (sy << 5);
+
+	for ( y = sy; y <= my; y++ ) {
+		unsigned char *img_data;
+		int x;
+
+		/* move the cursor */
+		M_lcd_cmd_and_data(0x11, cursor_pos >> 8, cursor_pos & 0xff);
+
+		/* setup for printing */
+		M_lcd_prepare_cmd(0x12);
+
+		img_data = ipod_scr + (sx << 1) + (y * (lcd_width/4));
+
+		/* loops up to 160 times */
+		for ( x = sx; x <= mx; x++ ) {
+		        /* display eight pixels */
+			M_lcd_send_data(*(img_data + 1), *img_data);
+
+			img_data += 2;
+		}
+
+		/* update cursor pos counter */
+		cursor_pos += 0x20;
+	}
+}
+
+/* get current usec counter */
+static int C_timer_get_current(void)
+{
+	return inl(0x60005010);
+}
+
+/* check if number of useconds has past */
+static int C_timer_check(int clock_start, int usecs)
+{
+	unsigned long clock;
+	clock = inl(0x60005010);
+	
+	if ( (clock - clock_start) >= usecs ) {
+		return 1;
+	} else {
+		return 0;
+	}
+}
+
+/* wait for LCD with timeout */
+static void C_lcd_wait_write(void)
+{
+	if ((inl(0x70008A0C) & 0x80000000) != 0) {
+		int start = C_timer_get_current();
+			
+		do {
+			if ((inl(0x70008A0C) & 0x80000000) == 0) 
+				break;
+		} while (C_timer_check(start, 1000) == 0);
+	}
+}
+static void C_lcd_cmd_data(int cmd, int data)
+{
+	C_lcd_wait_write();
+	outl(cmd | 0x80000000, 0x70008A0C);
+
+	C_lcd_wait_write();
+	outl(data | 0x80000000, 0x70008A0C);
+}
+
+static void C_update_display(int sx, int sy, int mx, int my)
+{
+	int height = (my - sy) + 1;
+	int width = (mx - sx) + 1;
+
+	char *addr = SDL_VideoSurface->pixels;
+
+	if (width & 1) width++;
+
+	/* start X and Y */
+	C_lcd_cmd_data(0x12, (sy & 0xff));
+	C_lcd_cmd_data(0x13, (((SDL_VideoSurface->w - 1) - sx) & 0xff));
+
+	/* max X and Y */
+	C_lcd_cmd_data(0x15, (((sy + height) - 1) & 0xff));
+	C_lcd_cmd_data(0x16, (((((SDL_VideoSurface->w - 1) - sx) - width) + 1) & 0xff));
+
+	addr += sx + sy * SDL_VideoSurface->pitch;
+
+	while (height > 0) {
+		int h, x, y, pixels_to_write;
+
+		pixels_to_write = (width * height) * 2;
+
+		/* calculate how much we can do in one go */
+		h = height;
+		if (pixels_to_write > 64000) {
+			h = (64000/2) / width;
+			pixels_to_write = (width * h) * 2;
+		}
+
+		outl(0x10000080, 0x70008A20);
+		outl((pixels_to_write - 1) | 0xC0010000, 0x70008A24);
+		outl(0x34000000, 0x70008A20);
+
+		/* for each row */
+		for (x = 0; x < h; x++)
+		{
+			/* for each column */
+			for (y = 0; y < width; y += 2) {
+				unsigned two_pixels;
+
+				two_pixels = addr[0] | (addr[1] << 16);
+				addr += 2;
+
+				while ((inl(0x70008A20) & 0x1000000) == 0);
+
+				/* output 2 pixels */
+				outl(two_pixels, 0x70008B00);
+			}
+
+			addr += SDL_VideoSurface->w - width;
+		}
+
+		while ((inl(0x70008A20) & 0x4000000) == 0);
+
+		outl(0x0, 0x70008A24);
+
+		height = height - h;
+	}
+}
+
+// Should work with photo. However, I don't have one, so I'm not sure.
+static void iPod_UpdateRects (_THIS, int nrects, SDL_Rect *rects) 
+{
+    if (SDL_VideoSurface->format->BitsPerPixel == 16) {
+	C_update_display (0, 0, lcd_width, lcd_height);
+    } else {
+	int i, y, x;
+	for (i = 0; i < nrects; i++) {
+	    SDL_Rect *r = rects + i;
+	    if (!r) {
+		continue;
+	    }
+	    
+	    for (y = r->y; (y < r->y + r->h) && y < lcd_height; y++) {
+		for (x = r->x; (x < r->x + r->w) && x < lcd_width; x++) {
+		    ipod_scr[y*(lcd_width/4) + x/4] &= ~(3 << (2 * (x%4)));
+		    ipod_scr[y*(lcd_width/4) + x/4] |=
+			(((Uint8*)(SDL_VideoSurface->pixels))[ y*SDL_VideoSurface->pitch + x ] & 3) << (2 * (x%4));
+		}
+	    }
+	}
+	
+	M_update_display (0, 0, lcd_width, lcd_height);
+    }
+}

src/video/ipod/SDL_ipodvideo.h

@@ -0,0 +1,42 @@
+/*
+    SDL - Simple DirectMedia Layer
+    Copyright (C) 1997-2004 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
+*/
+
+/* iPod SDL framebuffer driver
+ * Joshua Oreman
+ * Main header file
+ */
+
+#ifdef SAVE_RCSID
+static char rcsid =
+ "@(#) $Id$";
+#endif
+
+#ifndef _SDL_ipodvideo_h
+#define _SDL_ipodvideo_h
+
+struct SDL_PrivateVideoData {
+    char *buffer;
+    int w, h;
+};
+
+
+#endif