The bitmap ordering is defined such that the numbering refers to the pixel index from left to right, and the number position refers to the bit position in the byte.
SDL_BITMAPORDER_4321 is the fourth pixel at the high bit and the first pixel at the low bit (LSBFirst)
SDL_BITMAPORDER_1234 is the first pixel at the high bit and the fourth pixel at the low bit (MSBFirst)
Frank Zago to SDL
For those interested, here's a snapshot of the current port. I did away with
most of the previous attempt which was based of the sprite engine, because the
support is limited to 128 64x64 sprites. Instead I'm using the gl engine.
The drawback is that either the frame buffer or the gl engine can be used
because there's not that much video memory on a DS.
With minimal changes to their code, it can now run the following tests: ,
testspriteminimal, testscale and testsprite2. The last 2 only run under the
emulator for some reason. The tests are not included in this patch for size
reason.
In 16 bits mode, the 16th bit indicated transparency/opacity. If 0, the color
is not displayed. So I had to patch a few core file to set that bit to 1. See
patch for src/video/SDL_RLEaccel.c and src/video/SDL_blit.h. Is that ok, or is
there a better way ?
The nds also doesn't support windowed mode, so I force the fullscreen in
src/video/SDL_video.c. Is that ok, or is there a better way ?
To get a smaller library, I also tried to not compile the software renderer
when the hardware renderer is compiled in, and define SDL_NO_COMPAT; however
the compilation eventually fails in SDL_surface.c because SDL_SRCCOLORKEY is
defined in SDL_compat.h. Is SDL_NO_COMPAT only for application and not SDL
itself ?
Edgar Simo 2011-02-20 10:27:52 PST
Adding patch that adds a simplified API for the haptic subsystem built ontop of
the "real one" for those who want simple rumble without jumping through hoops.
Adds 4 functions:
- extern DECLSPEC int SDLCALL SDL_HapticRumbleSupported(SDL_Haptic * haptic);
- extern DECLSPEC int SDLCALL SDL_HapticRumbleInit(SDL_Haptic * haptic);
- extern DECLSPEC int SDLCALL SDL_HapticRumblePlay(SDL_Haptic * haptic, float
strength, Uint32 length );
- extern DECLSPEC int SDLCALL SDL_HapticRumbleStop(SDL_Haptic * haptic);
Also provided is test/testrumble.c which does test this.
This has all been tested on linux and has worked, but due to being built ontop
of the other haptic API it should work on all OS the same.
Even if we're blitting between two different surfaces their pixels might still overlap, because of SDL_CreateRGBSurfaceFrom(), so always use SDL_BlitCopy() and check for overlap in that function.
When handling overlapping surfaces, don't assume that memcpy() iterates forward, instead use memmove() correctly, and provide a fallback implementation of SDL_memmove() that handles the different cases.
Fixed a bug with SDL_memset() not completely filling lengths that aren't a multiple of 4.
Optimized SDL_memcpy() a bit using the same technique as SDL_memset().
The trick is that if you're using configure and you don't want to have SDL_config.h and SDL_revision.h to show up as modified, you need to configure and build from a separate directory.
You also need to include SDL_revision.h directly if you want to use the SDL_REVISION constant, as a side effect of these changes.
The render viewport is automatically re-centered when the window changes size, so applications that don't care will not have to handle recalculating their rendering coordinates.
Fixed API for drawing and filling multiple rectangles - the parameter should be an array of rects, not an array of pointers to rects.
Fixed API for updating window rects for consistency with other APIs - the order is pointer to array followed by count in array.
Fixed creating render texture framebuffer.
Removed the need for palette watch, added surface format caching.
Added an SDL_DONTFREE flag so you can't free the window and 1.2 shadow surfaces.
There's a new event that's always sent when the window changes size, and that event is what the renderers listen for to determine if they need to rebind their context.
tag: tip
user: Martin Decky <martin@decky.cz>
date: Sat Feb 12 20:53:06 2011 +0100
summary: improve header files compatibility with SDL 1.2 applications (namely QEMU)
The following patch fixes some of the bitrot for the Nintendo DS port.
The support is still basic at the moment, but it allows to run the "general"
test under the current head of tree (parent: 5269:11bd1585efb5 tip).
Most of the patch is mine, but I integrated a couple changes that John
Magnotti posted on Feb 1st.
attached is a working directfb driver diff which works with the current
changes. There are a number of changes around it as well, e.g.
configure.in.
The directfb renderdriver right now still depends on a some "includes"
from src/video/directfb. That's why it is not yet moved to the new
render folder.
The software renderer has been re-routed to use the framebuffer interface, which makes it possible to have software rendering available even on simple ports.
The new timer model is formalized as using a separate thread to handle timer callbacks. This was the case on almost every platform before, but it's now a requirement, and simplifies the implementation and makes it perform consistently across platforms.
Goals:
* Minimize timer thread blocking
* Dispatch timers as accurately as possible
* SDL_AddTimer() and SDL_RemoveTimer() are completely threadsafe
* SDL_RemoveTimer() doesn't crash with a timer that's expired or removed
CREATE_SUBDIRS helps a lot if browsing HTML documentation in a file browser.
ALWAYS_DETAILED_SEC makes sure everything has at least the automatic
documentation like function prototype and source references.
STRIP_FROM_PATH allows you to include only the relevant portions of the files'
paths, cleaning up both the file list and directory tree, though you need to
change the path listed here to match wherever you put SDL.
ALIASES avoids some warnings generated by
C:\source\svn.libsdl.org\trunk\SDL\src\joystick\darwin\10.3.9-FIX\IOHIDLib.h.
It seems Apple uses a few commands which are not normally supported by Doxygen.
BUILTIN_STL_SUPPORT adds support for parsing code which makes use of the
standard template library. There isn't a lot of C++ in SDL (some in bwindow at
least), but this still seems like a good idea.
TYPEDEF_HIDES_STRUCT means that for code like this:
typedef struct A {int B;} C;
C is documented as a structure containing B instead of a typedef mapped to A.
EXTRACT_ALL, EXTRACT_PRIVATE, EXTRACT_STATIC, EXTRACT_LOCAL_METHODS,
EXTRACT_ANON_NSPACES and INTERNAL_DOCS make sure that _everything_ is
documented.
CASE_SENSE_NAMES = NO avoids potential conflicts when building documentation on
case insensitive file systems like NTFS and FAT32.
WARN_NO_PARAMDOC lets you know when you have documented some, but not all, of
the parameters of a function. This is useful when you're working on adding
such documentation since it makes partially documented functions easier to
spot.
WARN_LOGFILE writes warnings to a seperate file instead of mixing them in with
stdout. When not running in quiet mode, these warnings can be hard to spot
without this flag.
I added *.h.in and *.h.default to FILE_PATTERNS to generate documentation for
config.h.in and config.h.default.
RECURSIVE tells doxygen to look not only in the input directory, but also in
subfolders.
EXCLUDE avoids documenting things like test programs, examples and templates
which need to be documented separately.
I've used EXCLUDE_PATTERNS to exclude non-source subdirectories that often find
their way into source folders (such as obj or .svn).
EXAMPLE_PATH lists directories doxygen will search to find included example
code. So far, SDL doesn't really use this feature, but I've listed some likely
locations.
SOURCE_BROWSER adds syntax highlighted source code to the HTML output.
USE_HTAGS is nice, but not available on Windows.
INLINE_SOURCES adds the body of a function to it's documentation so you can
quickly see exactly what it does.
ALPHABETICAL_INDEX generates an alphabetical list of all structures, functions,
etc., which makes it much easier to find what you're looking for.
IGNORE_PREFIX skips the SDL_ prefix when deciding which index page to place an
item on so you don't have everything show up under "S".
HTML_DYNAMIC_SECTIONS hides the includes/included by diagrams by default and
adds JavaScript to allow the user to show and hide them by clicking a link.
ENUM_VALUES_PER_LINE = 1 makes enums easier to read by placing each value on
it's own line.
GENERATE_TREEVIEW produces a two frame index page with a navigation tree on the
left.
I have LaTeX and man pages turned off to speed up doxygen, you may want to turn
them back on yourself.
I added _WIN32=1 to PREDEFINED to cause SDL to output documentation related to
Win32 builds of SDL. Normally, doxygen gets confused since there are multiple
definitions for various structures and formats that vary by platform. Without
this doxygen can produce broken documentation or, if you're lucky, output
documentation only for the dummy drivers, which isn't very useful. You need to
pick a platform.
GENERATE_TAGFILE produces a file which can be used to link other doxygen
documentation to the SDL documentation.
CLASS_DIAGRAMS turns on class diagrams even when dot is not available.
HAVE_DOT tells doxygen to try to use dot to generate diagrams.
TEMPLATE_RELATIONS and INCLUDE_GRAPH add additional diagrams to the
documentation.
DOT_MULTI_TARGETS speeds up dot.
OUTPUT_DIRECTORY, INPUT and other paths reflect the fact that this Doxyfile is
intended to process src as well as include and is being run from a separate
subdirectory. Doxygen produces several temporary files while it's running and
if interrupted, can leave those files behind. It's easier to clean up if there
aren't a hundred or so files in the same folder. I typically run doxygen in
SDL/doxy and set the output directory to '.'. Since doxygen puts it's output
in subfolders by type, this keeps things pretty well organised. You could use
'../doc' instead and get the same results.
You can also do this through the native API:
UIWindow *window = [[UIApplication sharedApplication] keyWindow];
Also needed to name the union for events and window info.
This allows all SDL code to take advantage of the atomic intrinsics on Windows, but doesn't cause applications just including SDL.h to pull in windows.h
Changed the CAS return value to bool, so it's efficient with OSAtomicCompareAndSwap32Barrier()
Added an atomic test adapted from code by Michael Davidsaver
