da.vidr.cc - Latest Comments

Re: LLJVM

Boris — Fri, 26 Aug 2011 12:32:19 -0000

Can someone please post a simple example how to call a c function from java, e.g. a function from zlib. I don't get it.

Re: LLJVM

Cory_mcm — Wed, 17 Aug 2011 14:05:36 -0000

Can this be used to run my SDL applications in my web browser?

Re: Converting videos to 3GP in Ubuntu Intrepid 8.10 with FFmpeg

abhilash ab — Sat, 16 Jul 2011 02:42:55 -0000

Convert a FLV file to a MPG
ffmpeg -i original_file.flv new_file.mpg

Make a MP3 from a MPG
ffmpeg -i input.mpg -vn output.mp3

Convert a WAV file to a MP3
ffmpeg -i son_original_file.avi -vn -ar 44100 -ac 2 -ab 192 -f mp3 new_file.mp3

Convert videos Ubuntu :

Re: LLJVM

Edward — Tue, 12 Jul 2011 10:24:35 -0000

Hey, David.

Nice work! I tried this out with LLVM 2.9. With several trivial changes to source code, I managed to compile the lljvm-backend. But it seems that line #81 of main.cpp:
pm.add(new JVMWriter(&td, fouts(), classname, debugLevel));
causes segmentation fault. My setup:
latest git source code + LLVM 2.9 + OS X 10.6

It would be great if you can update lljvm to make it work with LLVm 2.9.

Re: PixelStruct

Blooper Blooper — Fri, 08 Jul 2011 02:25:44 -0000

Can the 3d data be extraxted from this app and converted to eg . an .obj file?

Re: PixelStruct

shineraj — Thu, 07 Jul 2011 15:18:18 -0000

This one works

Re: Alter Feed Links

Jamie — Sat, 30 Apr 2011 15:38:32 -0000

If you're using wordpress, use FeedBurner FeedSmith plugin instead. It captures all possible ways of accessing your feeds and sends it to the designated FeedBurner feed.

See http://www.google.com/support/... for more information

Re: LLJVM

David A Roberts — Sat, 30 Apr 2011 03:29:55 -0000

make[1]: llvm-config: Command not found

It seems llvm-config hasn't been installed properly. Please refer to http://llvm.org/docs/GettingSt... for issues relating to LLVM installation.

Re: LLJVM

byter — Mon, 25 Apr 2011 15:25:25 -0000

OK so i put llvm folder where #include looks for files. But now im getting this error. I am not quite sure how to define this __STDC_CONSTANT_MACROS and __STDC_LIMIT_MACROS? Any ideas? suggestions? Thanks!

lljvm-0.2 $ make
cd include && make all
make[1]: Nothing to be done for `all'.
cd backend && make all
make[1]: llvm-config: Command not found
c++ -c main.cpp
In file included from /usr/include/llvm/Support/SwapByteOrder.h:18,
from /usr/include/llvm/Support/MathExtras.h:17,
from /usr/include/llvm/ADT/DenseMap.h:17,
from backend.h:26,
from main.cpp:23:
/usr/include/llvm/Support/DataTypes.h:45:3: error: #error "Must #define __STDC_LIMIT_MACROS before #including System/DataTypes.h"
/usr/include/llvm/Support/DataTypes.h:49:3: error: #error "Must #define __STDC_CONSTANT_MACROS before " "#including System/DataTypes.h"
In file included from main.cpp:23:
...

Re: LLJVM

byter — Sat, 23 Apr 2011 01:55:27 -0000

Done. wget is installed. Thanks!

'make' is still not working since it cant find llvm files. I have installed llvm. But is there any specific dir llvm should have been installed to?

lljvm-0.2$ make
make[1]: Nothing to be done for `all'.
cd backend && make all
make[1]: llvm-config: Command not found
c++ -c main.cpp
In file included from main.cpp:23:
backend.h:26:31: error: llvm/ADT/DenseMap.h: No such file or directory
backend.h:27:31: error: llvm/ADT/DenseSet.h: No such file or directory
backend.h:28:35: error: llvm/ADT/StringExtras.h: No such file or directory
backend.h:29:44: error: llvm/Analysis/ConstantsScanner.h: No such file or directory
.....

Re: LLJVM

David A Roberts — Fri, 22 Apr 2011 21:18:29 -0000

It looks like you need to install wget.

Re: LLJVM

byter — Fri, 22 Apr 2011 20:49:18 -0000

I am super excited that I found your website, i am trying to convert C code to Java bytecode and this looks perfect for it.

Ok so, in README of LLJVM, it says:
To compile LLJVM, simply call `make` in the project root directory, and call `make check` to run the testsuite.

(I have Downloaded LLJVM source, Jasmin, and LLVM, and using Mac osx 10.6)

Now when i do 'make', i am getting errors below, how can i resolve them? Any help would be great!!

lljvm-0.2$ make

cd include && make all
cd ../thirdparty && make newlib
wget -c ftp://sources.redhat.com/pub/n... -O newlib-1.17.0.tar.gz.part
make[2]: wget: No such file or directory
make[2]: *** [newlib-1.17.0.tar.gz] Error 1
make[1]: *** [../thirdparty/newlib] Error 2
make: *** [all] Error 2

Re: LLJVM

David A Roberts — Tue, 12 Apr 2011 22:44:29 -0000

Thanks for sharing your work on this. I'll look at applying these changes when I next get a chance.

Re: Creating flowcharts with PGF/TikZ in LaTeX

Mister Josh — Wed, 06 Apr 2011 16:34:31 -0000

Freakin perfect. Thank you! I knew there had to be a relatively straight forward way of doing this in Latex without going through some weird intermediary. Thanks again!

Re: LLJVM

Grzegorz — Tue, 22 Mar 2011 14:49:19 -0000

Any function declared in C as extern can be linked with static method of Java any class. Its done with lljvm linker. Whole runtime works this way.
Opposite calls are also possible. Check Function.java part of runtime for examples. It handles function pointers and function pointer calls. Example of how to call and pass args to C function is there.

Re: LLJVM

Grzegorz — Tue, 22 Mar 2011 14:45:08 -0000

If you define a C function as extern, you can link it with static method of any Java class. This is how the whole LLJVM runtime works and its done with lljvm.jar ld classname ...
Calling C function from Java is also possible. Check Function.java for examples. This part of LLJVM runtime handles function via pointer calls (and provides arguments in format required by C function)

Re: LLJVM

Grzegorz — Mon, 21 Mar 2011 14:28:56 -0000

I was trying to compile Kray -> www.kraytracing.com. Raytracer written by me in C++, but without use of libstdc++ and exception handling. One big problem I found was Java method size limit. LLJVM generates class constructor that loads all static data into memory. For Kray this constructor exceeded Java 64k method limit.
I have overcome this changing toolchain a bit.
Originally
1. you compile C/C++ to LLVM bytecode.
2. Link bytecode
3. convert to Java with LLJVM-backend
4. link with LLJVM runtime
5. assembly with Jasmin.

This way you got single .class file with your program.

I have modified LLJVM linker, such way it is able to link not only LLJVM generated code with .class files (libs and runtime), but also LLJVM generated files each other. Now workflow is as follows:

1. compile C/C++ to LLVM bytecode
2. convert each module of a project to LLJVM with LLJVM-backend (this produces Jasmin files with .extern references)
3. link all LLJVM files together (it resolves all .extern between modules and runtime/libs, and produces Jasmin files without .extern references)
4. assembly all Jasmin files into separate classes

This way we got .class file per C/C++ module and we have constructor per module instead of one big constructor.

Modified ld tool is here:
http://kraytracing.com/lljvm/l... source code
http://kraytracing.com/lljvm/l... compiled classes (but without libc)

Old ld tool syntax works a before, but its also possible to call it like this:

java -jar lljvm.jar ld [-v] -j input1.j input2.j ... -c class1 class2 ... [-e.newextension]

input1 input2 are Jasmin code files with .extern references (those produced by LLJVM-backend)
class1 class2 are runtime classes and all external stuff you need

.newextension is extension appended to input after linking

-v switch display some information about linking on screen (verbose mode)

With this Kray compiled fine. But due a bug in LLJVM (http://code.google.com/p/lljvm... I wasn't albe to render complex scenes. Can't wait to be able to play with it more and do some performance tests.

Re: PixelStruct

GDR! — Sun, 27 Feb 2011 13:08:52 -0000

Get a version from SVN and it will work. The .tar.gz is broken.

Re: LLJVM

Biolizard89 — Tue, 15 Feb 2011 22:17:54 -0000

Is any example code available to demonstrate C code calling Java functions, and Java code calling C functions? It's not obvious to me how that would be done, since C is never object-oriented, while Java is always object-oriented, making it difficult to see how their function names would be interoperable.

Thanks!

Re: Open source Photosynth: PixelStruct 0.2 released

David A Roberts — Tue, 04 Jan 2011 00:16:01 -0000

Please use the trunk version.

Re: Open source Photosynth: PixelStruct 0.2 released

David A Roberts — Mon, 03 Jan 2011 23:59:24 -0000

Have you installed libqt4-dev?

Re: PixelStruct

Jan Alexander — Mon, 03 Jan 2011 13:00:49 -0000

Interesting video, exactly what i'm trying to achieve. Could somebody in here help me compile this fantastic program? I'm on Ubuntu 10.10-32bit. Following all the installation-instructions on the documentation, i ended up with the following compile error:

triangulation.cpp:(.text._ZN4CGAL15Triangulation_2INS_35Triangulation_euclidean_traits_xy_3INS_15Filtered_kernelINS_16Simple_cartesianIdEELb1EEEEENS_30Triangulation_data_structure_2INS_27Triangulation_vertex_base_2IS6_NS_30Triangulation_ds_vertex_base_2IvEEEENS_28Triangulation_ds_face_base_2IvEEEEE6insertERKNS_7Point_3IS5_EENSF_11Locate_typeENS_8internal11CC_iteratorINS_17Compact_containerINSC_ISE_EENS_7DefaultEEELb0EEEi[CGAL::Triangulation_2<cgal::triangulation_euclidean_traits_xy_3<cgal::filtered_kernel<cgal::simple_cartesian<double>, true> >, CGAL::Triangulation_data_structure_2<cgal::triangulation_vertex_base_2<cgal::triangulation_euclidean_traits_xy_3<cgal::filtered_kernel<cgal::simple_cartesian<double>, true> >, CGAL::Triangulation_ds_vertex_base_2<void> >, CGAL::Triangulation_ds_face_base_2<void> > >::insert(CGAL::Point_3<cgal::filtered_kernel<cgal::simple_cartesian<double>, true> > const&, CGAL::Triangulation_2<cgal::triangulation_euclidean_traits_xy_3<cgal::filtered_kernel<cgal::simple_cartesian<double>, true> >, CGAL::Triangulation_data_structure_2<cgal::triangulation_vertex_base_2<cgal::triangulation_euclidean_traits_xy_3<cgal::filtered_kernel<cgal::simple_cartesian<double>, true> >, CGAL::Triangulation_ds_vertex_base_2<void> >, CGAL::Triangulation_ds_face_base_2<void> > >::Locate_type, CGAL::internal::CC_iterator<cgal::compact_container<cgal::triangulation_ds_face_base_2<cgal::triangulation_data_structure_2<cgal::triangulation_vertex_base_2<cgal::triangulation_euclidean_traits_xy_3<cgal::filtered_kernel<cgal::simple_cartesian<double>, true> >, CGAL::Triangulation_ds_vertex_base_2<void> >, CGAL::Triangulation_ds_face_base_2<void> > >, CGAL::Default>, false>, int)]+0x2b3): undefined reference to `CGAL::precondition_fail(char const*, char const*, int, char const*)'
collect2: ld returned 1 exit status
make[2]: *** [pixelstruct] Error 1
make[1]: *** [CMakeFiles/pixelstruct.dir/all] Error 2
make: *** [all] Error 2

Well, this is just a section of the whole compilation but the rest is basically identical to this section above " from triangulation.cpp "
I can't actually figure out exactly what the compiler needs !

Thanks for help or at least a reply !</void></void></cgal::compact_container<cgal::triangulation_ds_face_base_2<cgal::triangulation_data_structure_2<cgal::triangulation_vertex_base_2<cgal::triangulation_euclidean_traits_xy_3<cgal::filtered_kernel<cgal::simple_cartesian<double></void></void></cgal::triangulation_vertex_base_2<cgal::triangulation_euclidean_traits_xy_3<cgal::filtered_kernel<cgal::simple_cartesian<double></cgal::triangulation_euclidean_traits_xy_3<cgal::filtered_kernel<cgal::simple_cartesian<double></cgal::filtered_kernel<cgal::simple_cartesian<double></void></void></cgal::triangulation_vertex_base_2<cgal::triangulation_euclidean_traits_xy_3<cgal::filtered_kernel<cgal::simple_cartesian<double></cgal::triangulation_euclidean_traits_xy_3<cgal::filtered_kernel<cgal::simple_cartesian<double>

Re: Open source Photosynth: PixelStruct 0.2 released

Jan Alexander — Thu, 30 Dec 2010 23:56:26 -0000

Hello all, i've been trying for the past couple o days to compile this beautiful piece of work, but it tends to be more complicated than explained in the manual.
Well, my OS is Ubuntu 10.10, 32Bits. Please do help me if you have successfully compiled this software in the mentioned Operating system.
I tried the fix for Ubunutu 10.04-64, but it didn't help.

Thanks very much for at least a responds !

Re: Open source Photosynth: PixelStruct 0.2 released

Mapukastar — Tue, 28 Dec 2010 14:21:52 -0000

Sorry, here is a brief report of the error obtained while running "make" on ubuntu 10.10

mkdir -p build
cd build && cmake .. && make
-- The C compiler identification is GNU
-- The CXX compiler identification is GNU
-- Check for working C compiler: /usr/bin/gcc
-- Check for working C compiler: /usr/bin/gcc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
CMake Error at /usr/share/cmake-2.8/Modules/FindQt4.cmake:1148 (MESSAGE):
Qt qmake not found!
Call Stack (most recent call first):
src/CMakeLists.txt:1 (FIND_PACKAGE)

-- Configuring incomplete, errors occurred!
make: *** [all] Error 1

Much appreciation for helping!

Re: Open source Photosynth: PixelStruct 0.2 released

Mapukastar — Tue, 28 Dec 2010 14:16:49 -0000

i get an error compilling on ubuntu 10.10.