Mercurial > sdl-ios-xcode
view README.Watcom @ 3162:dc1eb82ffdaa
Von: Thomas Zimmermann
Betreff: [SDL] [PATCH] Make static variables const
Datum: Tue, 19 May 2009 19:45:37 +0200
Hi,
this is a set of simple changes which make some of SDL's internal static
arrays constant. The purpose is to shrink the number of write-able
static bytes and thus increase the number of memory pages shared between
SDL applications.
The patch set is against trunk@4513. Each of the attached patch files is
specific to a sub-system. The set is completed by a second mail, because
of the list's 40 KiB limit.
The files readelf-r4513.txt and readelf-const-patch.txt where made by
calling 'readelf -S libSDL.so'. They show the difference in ELF sections
without and with the patch. Some numbers measured on my x86-64:
Before
[13] .rodata PROGBITS 00000000000eaaa0 000eaaa0
0000000000008170 0000000000000000 A 0 0 32
[19] .data.rel.ro PROGBITS 00000000003045e0 001045e0
00000000000023d0 0000000000000000 WA 0 0 32
[23] .data PROGBITS 00000000003076e0 001076e0
0000000000004988 0000000000000000 WA 0 0 32
After
[13] .rodata PROGBITS 00000000000eaaa0 000eaaa0
0000000000009a50 0000000000000000 A 0 0 32
[19] .data.rel.ro PROGBITS 0000000000306040 00106040
0000000000002608 0000000000000000 WA 0 0 32
[23] .data PROGBITS 0000000000309360 00109360
0000000000002e88 0000000000000000 WA 0 0 32
The size of the write-able data section decreased considerably. Some
entries became const-after-relocation, while most of its content went
straight into the read-only data section.
Best regards, Thomas
author | Sam Lantinga <slouken@libsdl.org> |
---|---|
date | Wed, 03 Jun 2009 04:37:27 +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