Mercurial > sdl-ios-xcode
view README.Watcom @ 1982:3b4ce57c6215
First shot at new audio data types (int32 and float32).
Notable changes:
- Converters between types are autogenerated. Instead of making multiple
passes over the data with seperate filters for endianess, size, signedness,
etc, converting between data types is always one specialized filter. This
simplifies SDL_BuildAudioCVT(), which otherwise had a million edge cases
with the new types, and makes the actually conversions more CPU cache
friendly. Left a stub for adding specific optimized versions of these
routines (SSE/MMX/Altivec, assembler, etc)
- Autogenerated converters are built by SDL/src/audio/sdlgenaudiocvt.pl. This
does not need to be run unless tweaking the code, and thus doesn't need
integration into the build system.
- Went through all the drivers and tried to weed out all the "Uint16"
references that are better specified with the new SDL_AudioFormat typedef.
- Cleaned out a bunch of hardcoded bitwise magic numbers and replaced them
with new SDL_AUDIO_* macros.
- Added initial float32 and int32 support code. Theoretically, existing
drivers will push these through converters to get the data they want to
feed to the hardware.
Still TODO:
- Optimize and debug new converters.
- Update the CoreAudio backend to accept float32 data directly.
- Other backends, too?
- SDL_LoadWAV() needs to be updated to support int32 and float32 .wav files
(both of which exist and can be generated by 'sox' for testing purposes).
- Update the mixer to handle new datatypes.
- Optionally update SDL_sound and SDL_mixer, etc.
author | Ryan C. Gordon <icculus@icculus.org> |
---|---|
date | Thu, 24 Aug 2006 12:10:46 +0000 |
parents | 488eba319a25 |
children | 8c72321542f6 |
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Using SDL under Windows with the OpenWatcom compiler ==================================================== Prerequisites ------------- I have done the port under Windows XP Home with SP2 installed. Windows 2000 should also be working. I'm not so sure about ancient Windows NT, since only DirectX 3 is available there. Building should be possible, but running the compiled applications will probalbly fail with SDL_VIDEODRIVER=directx. The windib driver should work, though. To compile and use the SDL with Open Watcom you will need the following: - Open Watcom compiler. I used version 1.5. The environment variables PATH, WATCOM and INCLUDE need to be set appropriately - please consult the OpenWatcom documentation and instructions given during the installation of the compiler. My setup looks like this in owvars.bat: set WATCOM=C:\watcom set INCLUDE=%WATCOM%\h;%WATCOM%\h\nt set PATH=%PATH%;%WATCOM%\binnt;%WATCOM%\binw - A fairly recent DirectX SDK. The original unmodified DX8 SDK works, as well as the minimal DirectX 7 SDK from the Allegro download site (<http://alleg.sourceforge.net/files/dx70_min.zip>). - The SDL sources from Subversion - The file Watcom-Win32.zip (now available in Subversion) Building the Library -------------------- 1) In the SDL base directory extract the archive Watcom-Win32.zip. This creates a subdirectory named 'watcom'. 2) The makefile expects the environment variable DXDIR to be set to the base directory of a DirectX SDK. I have tried a stock DX8 SDK from Microsoft as well as the minimal DirectX 7 SDK from the Allegro download site. You can also edit the makefile directly and hard code your path to the SDK on your system. I have this in my setup: set DXDIR=D:\devel\DX8_SDK 3) Enter the watcom directory and run wmake sdl 4) All tests from the test directory are working and can be built by running wmake tests Notes: The makefile offers some options to tweak the way the library is built. You have at your disposal the option to build a static (default) library, or a DLL (with tgt=dll). You can also choose whether to build a Release (default) or a Debug version (with build=debug) of the tests and library. Please consult the usage comment at the top of the makefile for usage instructions. If you specify a test target (i.e. 'wmake tests' for all tests, or selected targets like 'wmake testgl testvidinfo testoverlay2'), the tests are always freshly compiled and linked. This is done to minimise hassle when switching between library versions (static vs. DLL), because they require subtly different options. Also, the test executables are put directly into the test directory, so they can find their data files. The clean target of the makefile removes the test executables and the SDL.dll file from the test directory. To use the library in your own projects with Open Watcom, you can use the way the tests are built as base of your own build environment. The library can also be built with the stack calling convention of the compiler (-6s instead of -6r). Test applications ----------------- I've tried to make all tests work. The following table gives an overview of the current status. Testname Status ~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ checkkeys + graywin + loopwave + testalpha + testbitmap + testdyngl + testerror + testfile + testgamma + testgl + testhread + testiconv - (all failed) testkeys + testlock + testoverlay + (needs 'set SDL_VIDEODRIVER=directx') testoverlay2 + (needs 'set SDL_VIDEODRIVER=directx') testpalette + testplatform + testsem + testsprite + testtimer + testver + testvidinfo + testwin ? (fading doesn't seem right) testwm + torturethread + testcdrom + testjoystick not tested threadwin + testcursor + TODO ---- There is room for further improvement: - Test joystick functionality. - Investigate fading issue in 'testwin' test. - Fix the UTF-8 support. - Adapt the makefile/object file list to support more target systems - Use "#pragma aux" syntax for the CPU info functions. Questions and Comments ---------------------- Please direct any questions or comments to me: <mailto:macpete@gmx.de> Happy Coding! Marc Peter