README.ds
author Sam Lantinga <slouken@libsdl.org>
Sun, 12 Feb 2012 21:04:01 -0500
changeset 6285 f12649068adb
parent 6251 3e8c673cad58
permissions -rw-r--r--
Updated Nintendo DS support Frank Zago This patch updates the DS port: - do not use the now removed compat layer. - integrate parts of libgl2D since I got permission from the author, and thus removed an external dependancy, - a few bugs fixes. Now, the textures should be completely supported, except reading from them which doesn't makes sense to have on the DS. Sound is still not supported. If someone else wants to work on the missing pieces, feel free.

================================================================================
Simple DirectMedia Layer for Nintendo DS
================================================================================

-Requirements-
* The devkitpro SDK available at http://devkitpro.org.
  Read the information at http://devkitpro.org/wiki/Getting_Started/devkitARM
  The necessary packages are devkitARM, libnds, libfat and default arm7.
* Optionally, use a DS emulator, such as desmume (http://desmume.org/)
  to program and debug.

-Building SDL-

After setting the devkitpro environment, cd into your SDL directory and type:
  make -f Makefile.ds

This will compile and install the library and headers into the
devkitpro's portlibs directory (../portlibs/arm/lib/ and
../portlibs/arm/include/). Additionally it will compile several tests
that you can run either on the DS or with desmume. For instance:
  desmume --cflash-path=test/ test/nds-test-progs/testsprite2/testsprite2.nds
  desmume --cflash-path=test/ test/nds-test-progs/testspriteminimal/testspriteminimal.nds
  desmume --cflash-path=test/ test/nds-test-progs/testscale/testscale.nds 
  desmume test/nds-test-progs/general/general.nds

-Notes-
* The renderer code is based on the gl like engine. It's not using the sprite engine.
* The hardware renderer is using the parts of the libgl2d abstraction library that can be found at:
    http://rel.phatcode.net/junk.php?id=117
  Used with the author's permission.
* The port is very basic and incomplete:
  - SDL currently has to be compiled for either framebuffer mode or renderer mode.
     See USE_HW_RENDERER in Makefile.ds.
  - some optional renderer functions are not implemented.
  - no sound

-Limitations-
* in hardware renderer mode, don't load too many textures. The internal format is
  2 bytes per pixel. And there is only 256KB reserved for the textures. For instance,
  testscale won't display sample.bmp, unless it's resized to a smaller picture.
* the screen size is 256 x 384. Anything else won't work.
* there is no 8 bits/pixel mode because SDL 2.0 doesn't support palettes.

-Joystick mapping-
The Joystick presented to SDL has 2 axes and 8 buttons

 KEY      | Code
  A       |   0
  B       |   1
  X       |   2
  Y       |   3
  L       |   4
  R       |   5
  select  |   6
  start   |   7

 Left-right is axe 0.
 Up-down is axe 1.

-Mouse mapping-
todo

-Examples-
Due to memory limitations, to be able to successfully run the testscale example, sample.bmp must be resized to 256x105.