Project: Gamp, replicate JogAmp's experience of GraphUI
and overall platform agnostic graphics framework for native platforms and web browser via WebAssembly
using emscripten.
Project: Various client projects and tutoring.
Activities: Porting and enhancing linear algebra, the Graph implementation and the overall platform agnostic graphics framework to C++20
while maintaining WebAssembly compatibility for the browser target. This work is also based on gfxbox2,
evaluating C++20 and the web-target
in a lax environment, suitable for teaching simple simulations and games.
IT-Environment: Linux, POSIX, C++, OpenGL, OpenAL, OpenCL, Mesa 3D and Linux DRM/DRI driver, ARM32, ARM64, Amd64, WebAssembly, gcc, clang/llvm, clang-tools, emscripten, Eclipse, VS-Code, ...
Project: Collabora Online, an open source online office suite based on LibreOffice
(LO).
Activities: Working on server side tasks, connecting web-clients with LO. Maintaining HTTP and WebSocket connections with DoS mitigation (latency, timeouts & limits) and statistic visuals. Analysis of LO/client server poll-loop, file-streaming and persistent user properties via WOPI (NextCloud), besides others.
IT-Environment: Linux, POSIX, BSD Sockets, OpenSSL, HTTP, WebSockets, REST API, WOPI, JSON, C++17, JavaScript/D3, gcc, clang/llvm, clang-tools, gdb, git, gerrit, github, Doxygen, LibreOffice, NGINX, Docker, NextCloud, ...
Project: JogAmp
Support, GraphUI, compiler features, high dpi, video encoding & decoding and misc. features
Activities: Realizing GraphUI,
a cross-platform UI utilizing our own resolution-independent GPU curve renderer.
GraphUI is suitable for desktop and embedded devices, it also runs on top of console kernel DRM driver without a windowing toolkit.
Notable entries are Reimagine Java on Desktop & Bare-Metal Devices,
FontView App,
Type Animation 2,
Type Animation at your Fingertips
and
others.
Activities: Supporting clients adopting JogAmp, implementing commissioned features
Presentations: Latest Blogs, JavaOne 2008, Tegra-1 Video Demo,
Siggraph[2010, 2011, 2012, 2013, 2014],
Fosdem[2013, 2014].
IT-Environment: Windows, Linux, Android, MacOS (x64, M1/aarch64), C++, C, Objective-C, Java, Vulkan, OpenGL, OpenAL, OpenCL, Mesa 3D and Linux DRM/DRI driver, ARM32, ARM64, Amd64, BCM, Omap3, Tegra, GCC, MingW, UML, git, Eclipse, vim, ..
Project: Detecting Rapid Test Results From a USB attached Camera.
Activities: Design & implementation of an embedded device software module to detect rapid tests results from live streamed images of a USB camera.
Image filter as well as appropriate detection algorithms had been chosen, used and partially implemented.
IT-Environment: OpenCV, C++17, gcc, Java, Linux, X86 and X86_64, ARM64, Raspberry, cmake, git, ..
Project: Adding Direct-BT
GATT-Server while being in BT-Client mode and hardening Passkey Authentication.
Activities: Certain devices acting as master/server require the client to provide a GATT-server for successful authentication.
This capability is essential to have these operating successful with the clients POC-Workstation.
Activities: General passkey authentication within Direct-BT and the client's application had been hardened and resolved.
IT-Environment: Bluetooth Core Spec v5.2, Linux Kernel BlueZ driver, C++17, gcc, llvm, valgrind, gdb, Java, Linux, X86 and X86_64, ARM32 and ARM64, Raspberry, cmake, Doxygen, UML, git, ..
Project: Direct-BT
and POC-Workstation
Support.
Activities: Design & realization of Direct-BT, a new Bluetooth stack using C++17 inclusive Java binding.
Direct-BT
provides direct Bluetooth LE and BREDR
programming, offering robust high-performance support for embedded & desktop with zero overhead via C++ and Java.
It supports a fully event driven workflow from adapter management and device discovery to GATT programming,
using its platform agnostic HCI, L2CAP, SMP and GATT protocol implementation.
Multiple Bluetooth adapter are handled, as well as multiple concurrent connections per adapter.
Peripheral server device programming is supported as well as the central client, which is also used for self unit testing across two or more Bluetooth adapter.
Further, the provided repeater application allows to connect between a Bluetooth client and server to analyze their protocol.
Direct-BT has been used successfully in a medical trial, as well as in a connected medical device terminal. The C++ and Java support library
has been extracted to encapsulate its generic use-cases.
To become feature complete using the underlying BlueZ Linux kernel host Bluetooth driver, the kernel implementation had to be analyzed via code review, manual instrumentation and debug traces. This resulted in full access of the Security Manager Protocol (SMP) via L2CAP and helped achieving Bluetooth 5 compatibility.
Activities: Support adoption of Direct-BT and participate in certain life-cycle tasks, code review, testing and production.
The POC-Workstation is a connected medical device terminal, a widely deployed embedded system.
Direct-BT enables the station to handle multiple parallel connections to medical devices as well as real-time data streaming and status monitoring.
SMP LE Secure Connections and LE legacy pairing is fully supported. Additionally, a BLE protocol analyzer has been developed.
Presentations: Latest Blogs, BLE Programming with C++ & Java
IT-Environment: Bluetooth Core Spec v5.2, Linux Kernel BlueZ driver, C++17, gcc, llvm, valgrind, gdb, Java, Linux, X86 and X86_64, ARM32 and ARM64, Raspberry, cmake, Doxygen, UML, git, gitlab, Bugzilla, Eclipse, vim, ..
Project: Secure System and Application Upgrade for a Connected Medical Device Terminal
Activities: Adopting Cipherpack
(OTA) streaming and atomic file operations and implementing a secure system and application upgrade.
Upgrade the deployed embedded system's read-only OS and application squashfs image
using a wide range of media, e.g. http, smb, usb memory stick, etc.
The implementation follows the 'copy once' pattern,
the sizeable OS image is put in place on the filesystem
during Cipherpack's decryption and authentication streaming.
A factory default and last version fallback boot facility is provided while managing multiple OS versions.
Robust instantiation of a new OS instance is realized via secure hash
validated OS level file copy and atomic rename operations.
A full set of POSIX file system operations inclusive
a privilege separated filesystem image mount
has been exposed to C++ and Java.
IT-Environment: C++17, Java, Linux, X86 and X86_64, ARM32 and ARM64, Raspberry, cmake, Doxygen, UML, git, gitlab, Bugzilla, Eclipse, vim, ..
Project: Cipherpack, authenticated secure stream processor.
Activities: Design & realization of Cipherpack using C++17 inclusive Java binding.
Cipherpack is a transport stream agnostic authenticated secure stream processor.
It utilizes public-key signatures to authenticate the sender
and public-key encryption of a symmetric-key to multiple parties
ensuring their privacy while allowing high-performance authenticated message encryption.
Primary use case in this project was the OTA application and OS upgrade process
for a deployed embedded system, a terminal for connected medical devices.
The API utilizes a listener event model,
allowing the user to interact during stream [de]cipher ,
e.g. rejecting the stream altogether based on header information.
IT-Environment: C++17, Java, Linux, X86 and X86_64, ARM32 and ARM64, Raspberry, cmake, Doxygen, UML, git, gitlab, Bugzilla, Eclipse, vim, ..
Project: Direct-BT
adoption for a Medical Clinical Trial.
Activities: Support adoption of Direct-BT in conjunction with custom BLE sensors, enhance Bluetooth 5 support and help create an intermediate software layer.
IT-Environment: Bluetooth Core Spec v5.2, C++17, Linux, BLE sensors, ..
Project: JogAmp, high performance Java libraries
for 3D Graphics
(OpenGL), multimedia
(OpenAL, ffmpeg) and processing (OpenCL)
across platforms (Windows, MacOSX, Linux, Android) for desktop, mobile & embedded systems.
Activities: Supporting clients adopting JogAmp for their commercial projects and implementing commissioned features and platform support.
To manage the project, I utilize a diverse set of tools to cover the project life-cycle: GIT for decentralized source control;
Bugzilla
for requirements, bug triage
and release definition;
Jenkins
for continuous integration including running our more than 1300 unit
tests
on supported test platforms;
Mediawiki
and API doc
for seamless documentation and
last but not least a forum
for transient communication.
Besides project management, I have resolved a few notable tasks from 2019 until May 2020
for the upcoming 2.4.0 release:
iOS support, DRM/GBM 'bare metal' support for embedded systems, JavaFX support, Java11 support, SWT and HiDPI issues, Aarch64 support (Linux, Android), compliance with Android >= 10 (SDK 29, NDK 20) and with critical MacOS API changes.
From 2010 until 2019, we fixed 589 bugs and realized numerous cross-platform features, some notable are:
GPU based curve rendering (Graph);
Android support;
Native windowing toolkit (NEWT) with cross-toolkit re-parenting, multi-monitor and HiDPI support;
FFMpeg video decoding and camera input with GPU pixel format conversion;
Smart JAR file deployment support;
Runtime binary format detection (ABI).
Presentations: Latest Blogs, JavaOne 2008, Tegra-1 Video Demo,
Siggraph[2010, 2011, 2012, 2013, 2014],
Fosdem[2013, 2014].
IT-Environment: Solaris, Windows, Linux, Android, MacOS, C, Objective-C, Java, OpenGL, OpenCL, OpenMax, OpenKode, Mesa 3D and Linux DRM/DRI driver, ARM32, ARM64, Amd64, Sparc, BCM, Omap3, Tegra, GCC, MingW, UML, git, Eclipse, vim, ..
Project: JOGL Redesign & Support
Activities: Redesigned the OpenGL Java language mapping JOGL
to support multiple windowing systems
and exposed multiple OpenGL profiles
(ES 1.1, ES 2.0 and GL 1.5 - 4.1)
targeting multiple desktop and embedded/mobile devices, technical lead.
Started a simple native windowing toolkit
(NEWT), demonstrating efficient JOGL usage on desktop and mobile devices without AWT.
Supported porting JOGL to multiple embedded devices, APX 2500,
Broadcom/LG, Intel CanMore and PowerVR-SGX/Omap3.
Adding OpenMax IL multimedia support access for embedded platforms.
APX 2500 Demo at JavaOne 2008
IT-Environment: Solaris, Windows, Linux, Android, MacOS, Java, JOGL, OpenGL, JOCL, OpenCL, OpenMax, OpenKode, ARM, IA-32, Amd64, Sparc, Omap3, Tegra, GCC, MingW, ..
Project: Java Plugin3 Development
Activities: Designed & realized Plugin3, technical team lead.
Abstracted the windowing layer and modularized Plugin2, forming Plugin3. It featured usage of custom windowing implementations bootstrapped via JNLP.
Improved startup time about factor 3 - 13 (new load, reload). Added support for offscreen drawable to allow browser side compositioning.
Implemented an OpenGL proof of concept module using JOGL and NEWT.
IT-Environment: Solaris, Windows, Linux, Java, OpenGL, GLX, WGL, Networking, UML, IA-32, Amd64, GCC, MingW, ..
Project: Experimental JavaFX
3D and multimedia cross platform UI API.
Activities: Targeted desktop and mobile devices for a high performance, state of the
art user interface (HMI). Utilized hardware acceleration (OpenGL ES1.1, ES2.0, GL 1.5-2.0, OpenMax) for the scenegraph layer.
Adding support for
per pixel lighting (normal maps)
using
Maya files.
Modularized and prepared the scenegraph layer for JOGL's mobile GL profiles.
IT-Environment: Linux, MacOSX, Java, JOGL, OpenGL, IA-32, Amd64, GCC, Maya, ..
Project: New Java Plug-In incl. JNLP support
Activities: JNLP integration in the New Java Plug-In.
Designed & refactored the Java Plugin and JNLP modules, to become Plugin2. Added Unix Domain Sockets for the client/server IPC on unices.
Stabilized the client/server communication and improved startup time.
Helped specifying the JNLP extension and extended the test framework covering the new features.
Presented at JavaOne 2008.
IT-Environment: Solaris, Windows, Linux, Java, IPC, Networking, UML, IA-32, Amd64, Sparc, GCC, VS-C, ..
Project: Embedded Graphics driver; Various embedded driver features and enhancements.
Activities: Managed requirements, designed & realized an embedded graphics driver
for OpenGL core, EGL 1.1, ES 1.1/2.0 on various graphic chips R3xx, R5xx, R6xx and their mobile variants.
Technical team lead.
Managed & implemented various customer feature & performance requirements:
Performance OpenGL extension, hardware overlay, asynchronous ReadPixel, GLSL/DMA texture
transfers, page flip, VSync and multi DMA page locks.
Transferred requirements to new technical specifications.
Enhanced performance about factor 2.5, targeting functional driver blocks like TLS, inlining, caching, dispatch table, stream copy, etc.
Participated in the general driver development within the software team and helped with enhancements.
Worked on SDK & demo infrastructure and multimedia demos.
IT-Environment: Doxygen, Office, UML, Perforce, Remedy; GNU: GCC, Linux, Valgrind, VTune, ATI Graphic Cards, Linux Kernel driver, OpenGL, GL ES; IA-32 and PPC, MPEG.
Project: Non Volatile Ram Manager
Activities: Managed requirements and specification for a new NV Ram Manager.
The backward compatible module covered new customer requirements.
IT-Environment: MKS, Doors, Innovator, Doxygen, MS Office, NEC, Lotus
Project: Linux Device Driver - Monolithic and User Space
Activities: Investigated user space functionality within Linux device drivers. Learned pros and cons of simple resource handler and utilization of complex user space libraries.
Implemented a portion of the Linux DVB API as an user level driver using FUSD and Gelato project knowledge.
IT-Environment: Linux Kernel 2.6.x driver, gcc, gcc, dvb API, FUSD, gelato, ...
Project: Embedded Multimedia Player
Activities: Evaluated hardware and software solutions.
Wrote proof of concept including evaluation, test and quality audit of mpeg solutions incl. software toolchain.
IT-Environment: Change Synergy, CM Synergy, x86, ESS 6218, ST20, Ansi-C++, DSP, gcc, mpeg2, a52, mp2, lpcm, dvd, ...
Project: Senior Engineer: OSGI, Multimedia, Embedded Systems, ...
Activities: Designed & realized an embedded multimedia platform for QNX/SH4 inclusive custom DSP A/V device driver,
which implemted the Linux DVB-API and hence enabled open-source application on the new target platform.
Evaluated, ported and enhanced misc. open source
multimedia projects, like vdr, vdr-dvd, xine, mplayer, libdvd, ...
to be used on mentioned QNX/SH4 target platform, utilizing the new DSB A/V driver.
Evaluated Linux-SH for the SH4 developing platform, added pci-dma support and
implemented PCI-IRQ management.
Ported a SH4 bootloader using bootp/nfs for disc-less system.
Evaluated a platform independent GUI/Widget toolkit: QT.
Objectives were to develop, test and cross-compile UI projects on different platforms.
Quality requirement goals were source code and UI builder availability and existance of some platform ports.
Implemented OSGI bundled applications in an client/server
environment for embedded systems (QNX-NTO, XFree86, Java/J2ME, ...).
IT-Environment: Linux Kernel driver, QNX-NTO driver, x86, SH4, Ansi-C, Ansi-C++, Java, OSGI, XFree86,
QT, QT Designer, DSP, gcc, gdb, ddd, mpeg2, a52, mp2, lpcm, dvd, ...
Project: Multimedia
Activities: Evaluated & enhanced open source multimedia projects,
like VDR, vdr-dvd, ...
IT-Environment: GNU/Linux, ANSI-C++, mpeg2, a52, dvd, ...
Project: Speaker: OpenGL(R), and New I/O - High-Performance 3D Graphics for the Desktop Client.
Activities: Presented utilization of the JVM's high performance New I/O using my OpenGL(R) language mapping for Java(TM) or GL4Java.
IT-Environment: GNU/Linux, Windows, Java, OpenGL
Project: System Administration
Activities: Planned, setup and maintened heterogeneous IT infrastructure using GNU/Linux, iptables, ppp, apache, sendmail, fetchmail, procmail, samba, nfs, nis, ssl, ssh, ... for the DMZ to serve GNU/Linux and Windows clients within different secure and insecure subnets.
Customers were public schools, training centers and internet shops.
IT-Environment: GNU/Linux, Windows, MacOSX; iptables, ppp, apache, sendmail, fetchmail, procmail, samba, nfs, nis, ssl, ssh, popper, imapd, VPN, ..
Project: OSGI - Car-Remote-Control
Activities: Implemented ClientServer OSGI bundles. The server, installed into the car, provided misc. remote maintenance services, like door locking, camera snapshots and retrieving the GPS position. The client could connect to the server and use said services in the role of the main user or as an observer with read-only access. The network access was secured via SSL & RSA encryption and authorized using RSA signatures.
The goal was to demonstrate the feasibility of a remote car control via Java
and OSGI bundles, which could be installed onto the client
through the internet.
IT-Environment: Java (Sun J2SE, IBM's J2ME J9), OSGI (IBM, Oscar, Acunia), HTTPS/SSL (JSSE), RSA (JCE) Encryption + Signature, Serial+Parallel (JavaComm), MOST, GPS
Project: XFree86 Integration and Driver Modules
Activities: Implemented an XFree86 driver module
for the Scarlet Fujitsu MB86291 graphics device
running under Linux & QNX (X86, SH4).
Enhanced and matured the XFree86 driver module
for the Siliconmotion Lynx3DM graphic device running under
Linux & QNX (X86,SH4).
The X11-Server was intended to be used within embedded systems
and therefor should have provided a graphics interface with
network abilities.
Using an X11-Server in the Unix (QNX) environment
opened up the embedded platform to a sizable amount of available applications,
e.g. media players, Java AWT implementations etc.
I added hardware accelerated functions for the graphic device like
blitting (XAA) and YUV overlay (Xvideo) and exposed them to the X11R6 interface.
High 2D and video playback performance with the Scarlet and the Lynx3DM chips
were realized.
Miscellaneous adaptations of the XFree86 internals for QNX-NTO
using the X86 and SH4 processor were made.
IT-Environment: Linux driver, QNX-NTO driver, ANSI-C, ANSI-C++ XFree86,
Scarlet Gfx Chip, Lynx3DM Gfx Chip, gcc, gdb, ddd, X86, SH4
Project: X11-Server AWT Implementation for Java
Activities: Completion & Bugfixing
of the AWT Implementation of Kaffe.
This AWT implementation did not require Motif (low Memory Footprint),
but rendered the GUI Widgets exclusively using the XLib.
With the assistance of this AWT solution we were able
to use standard Java GUI's within the J2ME environment
on a Unix and X11R6 based platform.
A QT solution was evaluated as well, but because of the limited
availability of a native QT implementation for the embedded device,
this approach was discarded.
IT-Environment: Java (Sun J2SE, IBM's J2ME J9), Linux, QNX-NTO, X11-Server, QT, Kaffe
Project: Location Based Premium Services (Usability)
Activities: Evaluated an application server based upon
XML. The application logic was provided via XML-Tags
to the web-author, which were implemented using XSP application-sheets.
These XSP application-sheets could be implemented with Java,
as well as with other programming languages.
The XML engine Cocoon provided a framework for said purpose.
XML documents could be filtered (piped) and serialized in such a manner,
that the application logic (XSP), multilingual support
and several output formats (PDF, HTML) were interoperable.
Database objects could be used through the J2EE interface.
The purpose of this server was to provide location based services.
Premium information like traffic control was provided to
the subscriber, which was connected to the network (GSM)
and provided its GPS location.
IT-Environment: Linux, Java, Servlets (Tomcat), Cocoon (XML/XSP/XSL), J2EE (JBoss), Apache, GPS
Project: Visualization of Organized Structures in 3D
Activities: Designed & implemented a 3D
visualization of organized structures, likely organigrams.
The hyperbolic 3D space was used,
so the objects and their correlated links were represented within
a sphere.
Interactions via mouse-over, mouse-drag and selection
were used to navigate through the structure.
IT-Environment: GNU/Linux, UML, Java, OpenGL For Java (GL4Java), OpenGL, UML(ArgoUML).
Project: Client/Server Protocol via XMLRPC
Activities: Designed & implemented a
communication solution between a native server application
running on AIX incl. DBMS and many Java clients.
XMLRPC was used for this purpose as a lightweight protocol.
XMLRPC was implemented in native ANSI-C++ on the server side
as well as in Java for the client side.
IT-Environment: AIX, Java, XMLRPC, UML(ArgoUML).
Project: Home Location Registers (HLR) - Innovation
Activities: Worked on HLR's DB replication setup and schematas.
HLR was part of the new infrastructure for mobile telecommunication.
IT-Environment: Unix (Solaris), UML, C++, Java,
TCP/IP, MAP/TCAP/CSS7, RTC.
Project: Speaker: Introduction to the OpenGL(R) language mapping for Java(TM)
Activities: Presented the OpenGL language mapping for Java (GL4Java):
Architecture, implementation and its usage.
IT-Environment: GNU/Linux, Windows, Java, OpenGL
Project: Tutoring on the subjects networking and Java
Activities: Taught basics and praxis of client-server network techniques,
as well as programming of tcp/ip based protocols in Java.
IT-Environment: Unix (Linux), Java, TCP/IP
Project: Reassurance auction platform in the internet
Activities: Helped designing & implementing the user
session management and other modules of an internet auction platform.
Direct insurers were able to offer partial layers of the overall risk
to the reassurance companies.
The whole handling including customer management
(broker, direct insurer and reassurance)
was supposed to take place in an HTML interface (Web-browser).
IT-Environment: Application server (Websphere, Apache, XML, Java Servlets), Java, EJB, DB2, PowerDesigner (DB-Design), Win32, Solaris.
Project: 3D Scenegraph-API for Java.
Activities: Implemented a native interface to the
scenegraph library.
Using the scenegraph API and GL4Java, an application
was be able to manage complex 3d structures and access native 3D techniques.
Maintenance and adaption of the scenegraph API is also part of this work.
IT-Environment: Unix (Linux), Windows, VRML, OpenGL, GL4Java, Java
Project: Cheops
Activities: Modeled, implemented and tested
theme objects based upon Use Cases.
The product discussed the complete
energy economy (device management, customer services, etc.).
The application was implemented in Java as a client/server solution.
IT-Environment: Java2, Paradigm Plus, PVCS, Win32, Oracle, Framework incl. ODBMS<->RDBMS Mapper, GUI (View, Controller, Business Object), Java Generator for Paradigm Plus, JDBC, Corba, RMI, Email.
Project:
GLMame32
Activities: Implemented a
M.A.M.E.
OpenGL
display drivers for for unix and windows.
This work based on Mike Oliphant's GLMame
XMame
.
GLMame32 is licensed under the
GNU Library General Public License
!
IT-Environment: Unix (GNU/Linux), Windows NT/95,
OpenGL, MSVC++ 5.0
Project:
Easy Travel Online (ETO)
der
Lufthansa Airplus
.
Activities: My tasks included the support of the
C++, IIOP and Java environments, as well as the networking area.
I managed to create a solution for the IIOP tunneling via HTTP
incl. proxy server and passing a firewall.
This solution was implemented in Java and used the Java-Servlet-API (JSDK).
This new middleware was accessed by the ETO clients using HTTP,
connecting to the web server within the server domain.
The middleware also provided secure transaction via SSL.
IT-Environment: Unix (Aix, GNU/Linux), Windows NT, , JDK 1.1.X, Java2, JSKD 2.1, Apache, Iona Orbix (-Web), Cygwin32, TCP/IP, HTTP, SSL, Firewall, Proxy-Server
Project:
GL4Java
Version 2.X.
Activities: Designed & implementation of a new object-model
to separate the
OpenGL
, GLU and
window handler objects.
Java2 and Netscape were also supported for Win32.
GL4Java is licensed under the
GNU Library General Public License
!
IT-Environment: Unix (Aix, Solaris, GNU/Linux), Windows NT/95,
Macintosh, OpenGL, JDK 1.1.X, Java2, Java-Native-Interface,
Cygwin32, TCP/IP, HTTP, GNU-C++, MSVC++ 5.0
Activities: Tutored in the areas of ANSI-C++, Java and networking.
Example projects were used to deepen newly taught theories.
IT-Environment: Unix (GNU/Linux), Windows NT,
, GNU-C++, JDK 1.1.X, RCS, SNMP, TCP/IP, Apache, UML
Project: Realization of an upgrade process in SDL(UML) and C++
Activities: Designed & realized a multithreaded upgrade process in
SDL(UML) and C++ for the embedded target platform VxWorks/680xx, XpressLink DSL project.
The latter pushed new firmware to the home based xDSL modems.
I introduced & enabled independent module development & test, utilizing synthethic input data, which also untangled teams developing modules of the system.
I took part in the black-box review process, documentation and realization of
module & (regression) unit tests on the host and target system.
The emphupgrade process was developed for the project XpressLink
of the
Siemens AG, M"unchen.
IT-Environment: Unix (Sun - Solaris), Windows NT,
SDT 3.11 (Telelogic SDL)
, GNU-C++, ClearCase (ClearTool), VxWorks (Target), SNMP (MIB)
Project: GL4Java, OpenGL language mapping for Java
Activities: Created a Java extension, exposing OpenGL and GLU natively under Java.
The OpenGL interface was implemented using the Java
Native Interface (JNI), connecting the Java-Methods to the native OpenGL functions.
I setup a platform independent development environment under Unix
(AIX, GNU/Linux) and Windows NT (Cygnus-GNU-Tools, ...) for using
Java, ANSI-C, Makefile, etc.
This works started under the supervision of
Prof. Dr. math. Bunse
FH-Bielefeld
for my diploma thesis.
GL4Java is available under the URL:
http://www.jausoft.com/gl4java/.
IT-Environment: Java Developer Kit 1.1.X (JDK), JavaCC, Latex, HTML, Make, RCS, Unix (AIX, GNU/Linux, Solaris), Windows NT, Cygnus-GNU for Win-NT 4.0 (bash, vi, sed, grep, awk, ...)
Project: Technical Prototype (GUI) for a Call-Center Application
Activities: Created and integrated GUI widgets (objects) plus functional extensions in Java for Sun's Java-WorkShop:
Created prototypes, installed Source Control System (SCCS) on AIX,
supported GUI-Team with Java know-how and Web-Publishing.
IT-Environment: Sun's Java WorkShop 1.0, Java Developer Kit 1.02 (JDK), Symantec Visual-Cafe, JavaCC (Java Compiler Compiler), HTML, Netscape (WWW), Make, SCCS, Unix (AIX), Windows NT, Cygnus-GNU for Win-NT 4.0 (bash, vi, sed, grep, awk, ...)
Project: Evaluate platform independent graphical user interfaces and
applications.
Activities: Usability test of Tcl/Tk and Java,
to provide OS independent applications with a GUI.
Examples with multi-threading, sound, animation, tables, menus
and system interfaces are created for testing purposes.
The Java libraries, (applet, awt, io, ...) as well as
the TK-Library were evaluated for this purpose.
The development environment was assembled with the
JDK 1.02, GNU/Linux and Java Workshop 1.0.
IT-Environment: Unix (GNU/Linux), MS-Windows 95, ANSI-C, ANSI-C++,
Tcl/Tk,
Sun's Java WorkShop 1.0, Java Developer Kit 1.02 (JDK),
HTML, Netscape (WWW), Make, RCS
Projects: CAD/CAM DIN66025 for 80166-Controller (Sewing machine),
OS services for 8051 and 80166 controller-cards.
Activities: Implemented modules in ANSI-C to support
OO development inclusive Run-Time-Type-Information (RTTI) and
virtual methods for user defined data types.
Implementation of a dynamic polymorph list type.
All modules were supporting the bare-metal target platform
80166-Controller, KEIL-C compiler.
Created a Unix like file system for a PCMCIA ram-card,
and an IPC communication protocol for two 80166-Controller.
Ported the DIN66025 compiler written in C++ to C, which was created for the
Windows CAD/CAM application (see earlier project below).
This effort allowed the DIN66025 CNC description to be visualized and editable
on the 80166-Controller as well.
IT-Environment: Controller hardware 80166 and 8051, MS-Dos, ANSI-C
(KEIL compiler for 80166 and 8051 Controller),
Unix-Environment for MS-Dos (MKS), RCS, Make, ANSI-C++ (GNU)
Activities: SQL-DB GUI for a web-server.
Queries and db-management were offered by a created http/cgi interface.
Filters to process the non-uniform data for
the db import were realized with Unix scripts (awk/sed/...).
IT-Environment: Unix (GNU/Linux), HTTP-Server (Apache),
mSQL (DBMS), ANSI-C, ANSI-C++ (GNU), RCS, Make, awk, sed, grep
Project: CAD/CAM DIN66025 under MS-Windows (3.1 u. 95)
Activities: Developed a CAD/CAM application.
The applications exposed two DIN66025 CNC views simultaneously,
one for the graphical and one for the text based representation
of the geometric and the technical data.
Both views were editable and the data & views synchronized.
The text representation was the source data compiled into
an OO data structure, capable to be drawn in the graphical 2D view
and to be printed into a DIN66025 text file simultanously.
IT-Environment: MS-Windows/Windows95, ANSI-C++ (MS VisualC++), MFC,
Word 5 (Onlinehelp), Lex & Yacc (MKS), RCS (GNU), Make (GNU),
Unix env. (MKS/GNU/Linux)
Project: DB interface to AutoCad (visualization and graphical editing)
for analysis and manipulation.
Activities: Data sets from a Street- and Drain-DB were visualized and edited
with AutoCad.
IT-Environment: MS-Dos, ANSI-C++ (Watcom), dBase DB, AutoCad (MS-Dos),
RCS (MKS), Make (MKS), Unix env. (MKS/GNU/Linux)
Project: C++ Training
Activities: ANSI-C++ Training 1-2 times weekly.
IT-Environment: ANSI-C++, Teaching with MS-Dos and Borland-C++ 4.0
Projects: CAM tools, compiler construction,
CNC-Format conversion, geometry & process CNC editing,
DB interface.
Activities: Designed & realized a DSL compiler for custom programming of CNC machines
including geometry & process optimizations.
Used generic hash-lists incl. quick-sort pass,
dereferencing symbolic objects allowed complext high performance scripts.
The compiler generated byte-code structured in an Abstract Syntax Tree (AST).
Wrote an CNC crosscompiler based on above DSL compiler.
Scripts written for this DSL module processed a universal CNC-Format (FXM) and
translated them to machine specific CNC-Formats.
DSL compiler was also used to implement different CNC filters for analysis
and geometry enhancements, as well as to optimize machine-cycles.
Demonstrated superior Genetic Algortithm for route & tool-change optimizations.
IT-Environment: MS-Dos, Unix, ANSI-C++ (Borland 4.0, Watcom, GNU-C++),
Lex Yacc (MKS), RCS (MKS), Make (MKS), Unix-Env. (MKS/GNU/Linux)
Project: Cross compiler from SET-PR (SDL)
to SDT-PR (SDL)
Activities: Developed a
Specification-Description-Language (SDL now UML) Cross Compiler
from SET-PR to SDT-PR, as well as of SDL-PR to ANSI-C. The
task was solved by using LEX, YACC and an ANSI-C Compiler
of a SUN- and HP-Workstation.
IT-Environment: Sun- u. HP-Workstation, ANSI-C, LEX u. YACC, Make, Korn-Shell
Project: Solution- and optimizing system
Activities: Development of an OO Genetic Algorithm to solve P and NP problems.
Sample applications Missionary and cannibals (game simulation),
as well as distance (travel-salesman) optimization.
IT-Environment: Unix, MS-Dos, ANSI-C++ (Borland 4.0), RCS, Make
Project: Specification and documentation of parallel Processes.
Activities: Translation of SDL-PR to SDL-GR (Graphic Display) for
MS-Windows. Development of protocols for ISDN and Ethernet
using SDL.
IT-Environment: MS-Windows, Unix, C++ (Borland 3.1 - Windows),
ISDN, Ethernet, SDL
Project: ScanArts - GUI for manipulation of scanned
mathematic 2D formulas (described in c't 1993/09).
Activities: Performed graphic programming on MS-DOS and MS-Windows.
Implemented general Drag and Drop, Pixel-chain scanning, fill algorithms,
drawing of Lines and circles, Matrix rotation and transformation as well as
Techniques for reversible graphical editing (undo). Co-author of publication
Mathematic User Interface with Recognition of two-dimensional Formulas1.
My additions here were the chapters
Graphical Editing of Graphic Formulas
as well as
User Interface for ScanArts to Maple Algebra Program.
IT-Environment: MS-Dos u. -Windows, ANSI-C (Borland 3.1, BGI), MapleV, Word 5
Project: Porting a quick-Basic application to Turbo-Basic
Activities: Build translator converting quick-Basic to Turbo-Basic.
Implemented own lexical state machine, similar to LEX.
IT-Environment: MS-Dos, ANSI-C, Basic