Mercurial > sdl-ios-xcode

view README.Epoc @ 689:5bb080d35049

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Date: Tue, 19 Aug 2003 17:57:00 +0200 From: Stephane Marchesin Subject: Re: [SDL] [patch] MMX alpha blit patches with MMX detection I think everything is correct now. I've done as much testing as I could, but some real-world testing wouldn't hurt, I think. The patch is here : http://icps.u-strasbg.fr/~marchesin/sdl_mmxblit.patch If you do byte-by-byte comparison of the output between C and MMX functions, you'll notice that the results for 555 and 565 RGB alpha blits aren't exactly the same. This is because MMX functions for 555 and 565 RGB have an higher accuracy. If you want the exact same behaviour that's possible by masking the three lower alpha bits in the MMX functions. Just ask ! I removed one MMX function because after I fixed it to match its C equivalent, it revealed to be slower than the C version on a PIII (although a bit faster on an Athlon XP). I've also added MMX and PIII replacements for SDL_memcpy. Those provide some speed up in testvidinfo -benchmark (at least for me, under linux & X11).
author Sam Lantinga <slouken@libsdl.org>
date Fri, 22 Aug 2003 05:51:19 +0000
parents 74a8f672f2f8
children
line wrap: on
line source


==============================================================================
Using the Simple DirectMedia Layer with EPOC/SymbianOS 6.0
==============================================================================

==============================================================================
I.  Building the Simple DirectMedia Layer libraries:

  You can get Symbian SDK from: 
    http://www.symbian.com.
 
  First create "Epoc" directory under SDL main directory and unpack 
  EpocBuildFiles.zip in it.
   
  To build the librarys goto "epoc" directory and type:
    bldmake bldfiles
    abld makefile vc6 (for creating Microsoft Visual C++ makefiles)
    abld build wins udeb (building for wins emulator)
    abld build armi urel (building for real device)

==============================================================================
II. Building the Simple DirectMedia Layer programs:

  Building SDL test programs is easy once you have built the libraries:
    abld test build wins udeb
    abld test build armi urel

  Supported real screen resolutions
    320 x 200 x  8 bit
    320 x 200 x 12 bit
    640 x 200 x  8 bit
    640 x 200 x 12 bit
  Supported "emulated" screen resolutions 
    640 x 400 x  8 bit
    640 x 400 x 12 bit
    640 x 480 x  8 bit
    640 x 480 x 12 bit
  "Emulated" resolutions are implemented by by shrinking the screen vertically 
  i.e. only every second scanline is drawn. This is mainly ment to be used for 
  testing quick ports of programs. Using faked resolutions is a waste of memory 
  and cpu power!

==============================================================================
III. Running test programs

  Copy executable to the device and run it from the File manager.   The Esc 
  key quits demo programs. In Crystal, Exe programs do not appear in task list 
  nor in Extras :-(. Test programs are tested in Nokia 9210 Communicator.

  Special keys used in SDL:
    The Caps lock key enables or disables the virtual cursor. 
    Function keys are mapped as follows: 
    F1=chr+q, F2=chr+w,..., F8=chr+i, 
    F9=chr+a,..., F12=chr+d.

==============================================================================
IV.  Enjoy! :)

  If you have a project you'd like me to know about, or want to ask questions,
  go ahead and join the SDL developer's mailing list by sending e-mail to:

	sdl-request@libsdl.org

  and put "subscribe" into the subject of the message. Or alternatively you
  can use the web interface:

	http://www.libsdl.org/mailman/listinfo/sdl

  You can find more info about Epoc version of SDL from Hannu Viitala's 
  homepage
    http://www.mbnet.fi/~haviital
  
==============================================================================