gmane.comp.lib.sdl

Re: IMG_Load_RW

Kevron Rees — 2008-12-04T17:02:15

It doesn't make sense to me either ;). I'm writing to disk the exact memory space that I'm creating the RWop with: SDL_RWops * picData = SDL_RWFromMem(pic->picture().data(),pic->picture().size()); ofstream temppic; temppic.open("/tmp/album-image.jpg",ios::binary | ios::trunc); if(temppic) { temppic.write(pic->picture().data(),pic->picture().size()); temppic.close(); } The image that I write to the disk works, but the RWop doesn't.... Is there an environment variable that I can use to turn on SDL debugging? or do I have to compile that in? SDL 1.2.13 SDL_Image 1.2.6

Re: Game freezes after certain time of function call.

2008-12-04T16:26:03

Hiyya, I want to point you to learn how to fish instead of handing you a fish. Your code style looks like a first poke at it which is not a poblem. Take a look at the following and research the function names as needed. ofstream fout("testX3.txt"); fout << "testx3 >main accessed" << endl; screen=SDL_SetVideoMode(700,500,16,SDL_HWSURFACE|SDL_DOUBLEBUF|SDL_RESIZABLE); if ( screen == NULL ) {printf("Unable to set 700x500 video screen: %s\n", SDL_GetError()); exit(1);} int main(int argc, TCHAR *argv[]) //get user preferances ifstream pref("data/config.txt"); if (pref.fail()) {fout << "Loading config file failed" << endl;} i = 0; while (pref >> nextoken) { if (i < 20)//in case of hacking { config_line[i] = nextoken; fout << "testx9 >" << config_line[i] << endl; i++; } } pref.close(); Maybe you can do better than me but this code is worth understanding to save you time and effort on a regular basis. Woot ---- Guilherme Farrer gmail.com> wrote: =============

Re: Disable VT switching under Linux

Hinko Kocevar — 2008-12-04T15:46:09

I'm not sure if above would work happily with fbcon.. I've found another solution. If instead of querying /dev/tty0, /dev/tty1 is used for VT_OPENQRY ioctl() the problem never occurs. This was observed in the tslib code. Here is the patch: hinkok< at >alala /work/export/SDL-1.2 $ svn diff Index: src/video/fbcon/SDL_fbevents.c =================================================================== --- src/video/fbcon/SDL_fbevents.c(revision 4179) +++ src/video/fbcon/SDL_fbevents.c(working copy) < at >< at > -246,7 +246,7 < at >< at > { /* Open only if not already opened */ if ( keyboard_fd < 0 ) { -static const char * const tty0[] = { "/dev/tty0", "/dev/vc/0", NULL }; +static const char * const tty0[] = { "/dev/tty1", "/dev/vc/1", NULL }; static const char * const vcs[] = { "/dev/vc/%d", "/dev/tty%d", NULL }; int i, tty0_fd; Can someone shed some light on why does such subtle change make so much difference? Thank you, Hinko

Re: cygwin layer and OpenGL

Eric Lilja — 2008-12-04T14:09:09

I just used the pre-compiled development libraries for MinGW available on libsdl.org. Also, I just updated my cygwin installation and installled the latest OpenGL-package (that was, in fact, just updated) and "installed" the latest SDL MinGW development libs by unpacking it into my home directory. Then I tried building and running a test program and it worked just fine. I ran the program with: $ PATH=$PATH:~/SDL-1.2.13/bin/ ./runme & so I didn't need to put SDL in the PATH for this test or have more than one copy of the DLL-file. The makefile of the program I tried was almost identical to the one I posted previously, it had just been updated to look for SDL-1.1.13 instead. Sorry, no experience with this whatsoever. [snip] - EL

Re: cygwin layer and OpenGL

Bernd Roesch — 2008-12-04T11:52:07

Hello Eric On 04.12.08, you wrote: is there somewhere a binary package of SDL for cygwin to install ? I did not find any. I compile SDL for cygwin my own, type ./configure, make and make install i install it and can compile defendguin But OWB ( a web browser that use SDL for render http://www.sand-labs.org/owb) setup does always say i have no SDL installed. In usr/local/bin/sdl-config is this after make install.strange that it use mingw include.host and build is in configure correct show as i686-cygwin and i compile under gcc in cygwin. #!/bin/sh prefix=/usr/local exec_prefix=${prefix} exec_prefix_set=no libdir=${exec_prefix}/lib #usage="\ #Usage: sdl-config [--prefix[=DIR]] [--exec-prefix[=DIR]] [--version] [--cflags] [--libs]" usage="\ Usage: sdl-config [--prefix[=DIR]] [--exec-prefix[=DIR]] [--version] [--cflags] [--libs] [--static-libs]" if test $# -eq 0; then echo "${usage}" 1>&2 exit 1 fi while test $# -gt 0; do case "$1" in -*=*) optarg=`echo "$1" | LC_ALL="C" sed 's/[-_a-zA-

OpenGL vsync with SDL in Vista

Stephen Anthony — 2008-12-04T12:05:22

I'm researching some problems with SDL OpenGL and Vista that I'm having. Specifically, vsync doesn't seem to work at all in windowed mode, and doesn't seem to be working the best in fullscreen either. And the CPU usage jumps to 26-27% on a Q6600 < at > 3GHz, but when I turn vsync off, CPU usage drops to 1-2%. Here's the relevant stats for my development system: Q6600 CPU < at > 3GHz 4 GB RAM Vista Business 64-bit Nvidia 9600GT with latest drivers Vista rating of 5.9 I should add that in Linux (both Mandriva and Kubuntu), the CPU usage stays low in OpenGL vsync mode, and vsync actually works (nice smooth updates, no tearing, etc). And the same code runs just as smooth in OSX as well. I'm not using any advanced OpenGL features at all. Basically just glTexSubImage2D for a 320x240 window (sometimes scaled larger, but still only using 320x240 of data). Does the SDL GL swap interval functionality not work in Vista? Or is it strictly a Vista issue?? I haven't tried it in WinXP on this system, but I don'

Re: Game freezes after certain time of function call.

Guilherme Farrer — 2008-12-04T11:59:37

2008/10/12 systat< at >net.hr net.hr>: Quick looking at your code, found that file "up.zzp" is missing. (a tip: always verify in the code if the file you tried to load was really loaded, displaying some warning or error message if it wasn't) Second, your function 'loadLevel' seems strange, better if writed with {} blocks (as bellow): //It reads data from file, and creates level void loadLevel(string filename) { ifstream a(filename.c_str()); if(!a) { cerr << "Error: Can't open file: " << filename << endl; return; } for(int i=0;i<12;i++) { for(int v=0;v<16;v++) { a >> map[i][v]; } } a.close(); } Third: Some function names make it hard to understand what you want them to do ('Blah' function to blit tiles on the screen??) I recommend you doing some debug with gdb (or with some printf/cerr on the code) at your program and see if you can get the error(s)... [ ]'s Farrer

Re: cygwin layer and OpenGL

Eric Lilja — 2008-12-04T10:01:03

Hi Resul, I don't have the tools setup now but I've used a combination of SDL and an OpenGL in the past without passing -mno-cygwin to the compiler. Here's an example of one of my Makefiles that I used. It was last modified on the 21st of july 2007 so it worked at least back then but, unfortunately, I can't test it now. CXX = g++ CXXFLAGS = -Wall -Wextra -std=c++98 -pedantic -g -I ~/SDL-1.2.12/include/SDL -c LDFLAGS = -L ~/SDL-1.2.12/lib -lSDL -lopengl32 -lglu32 -lglut32 -o $(EXEC) EXEC = runme.exe OBJECTS = display.o main.o all: $(OBJECTS) $(CXX) $^ $(LDFLAGS) display.o: display.cpp display.hpp $(CXX) $(CXXFLAGS) $< main.o: main.cpp display.hpp $(CXX) $(CXXFLAGS) $< clean: rm -f $(OBJECTS) $(EXEC) $(EXEC).stackdump As you can see I used SDL 1.1.12, and cygwin would've been current for that time. As I recall, I'm linking to glut just to be able to use glutBitmapCharacter, nothing more. Right now there seems to be a problem in cygwin with the win32api package shipping one version of glut an

Disable VT switching under Linux

Hinko Kocevar — 2008-12-04T09:39:57

Hi, I already did some research on the subject. The problem occurs when killing the SDL application and restarting it. When libSDL reaches the code where VT_WAITACTIVE is issued the ioctl() never returns - in FB_EnterGraphicsMode(). We are seeing the problems when running SDL applications on Linux framebuffer (fbdev), not tested under X11 or another SDL video driver. I can reproduce the case anytime with simple testpalette test that comes with libSDL in 1.2 branch on x86 and our embedded arch (cris): $ ./configure --enable-video --enable-events --enable-video-fbcon --disable-everything-else-tm $ make $ make install $ cd test && ./configure && make $ cd test && sudo ./testpalette $ # In another console I do: killall -9 testpalette $ Killed $ # now restart the app $ cd test && sudo ./testpalette Now the screen is not initialized and the strace output shows that we are currently waiting on VT_WAITACTIVE ioctl(). Is this a known issue with Linux console and VT? How can this be overcome? I've found a 'solutio

Re: Impossible to debug SDL applications on X11

Oliver Bock — 2008-12-04T09:10:48

Hi Simone, Without thinking too hard I see two ways to get around that issue: 1) Run your app in windowed mode while debugging 2) Use remote debugging (gdbserver, e.g. from within Eclipse CDT) Cheers, Oliver Simone Navari wrote:

Re: Why use OpenGL for rendering 2D game? [was] Scripting (3)

Donny Viszneki — 2008-12-04T01:48:01

I think every reason has been repeated at least three times. When can we replace the thread with a Google Spreadsheet survey type thing? It'll read "Why do YOU use OpenGL for 2D games?" There'll be a trick question on whether or not you try to read threads entirely before posting to them. On Thu, Nov 27, 2008 at 3:34 AM, Paulo Pinto gmail.com> wrote:

SDL 1.3 and Menus

Brian Barnes — 2008-12-04T01:30:52

I know that this could be considered out of scope, and maybe it's something already in, but it would be nice to see relatively simple menu support in SDL windows. It could obviously be tied into the event system easily and the menus would probably be programmatically created. The reason I'm asking is a lot of games can have a windowed mode and/ or editors and other utility programs that could be better served with more cross platform code. There's the 1 menu vs many OS problem, though. [>] Brian

Re: SDL website moving hosting

Torsten Giebl — 2008-12-04T00:39:48

Hello ! Is the new server/account any bigger/better ? The wiki and everything else loads faster now. CU

Re: iPhone SDK <-> SDL License

Jay Freeman (saurik — 2008-12-03T23:52:01