OpenGl - Tutorial 08 : LookAt - Split - Clipping.
OpenGL Lesson #42. Welcome to another fun filled tutorial. This time I will show you how to display multiple viewports in a single window. The viewports will resize correctly in windowed mode. Two of the windows use lighting. One of the windows is Ortho and three are Perspective. To keep the tutorial exciting, you will also learn about the maze code used in this demo, how rendering to a texture (yet again) and how to get the current windows dimensions.
Once you understand this tutorial, making split screen games or 3D applications with multiple views should be a snap! With that said, let dive into the code!!! You can use either the latest NeHeGL code or the IPicture code as the main basecode. The first and most important thing that has changed is ReshapeGL( ). Next we add some code to watch for the Window Message Erase Background (WM_ERASEBKGND). In WinMain we need to modify the window title and crank the resolution up to 1024x768. Now it's time to modify lesson42.cpp (the main code)... Jeff Molofee (NeHe) Nate Robins - OpenGL - Tutors. OpenGL Programming Guide (Addison-Wesley Publishing Company): Ta. OpenGL GUI Application - Iceweasel. This article is about a MVC (Model-View-Controller) framework to create OpenGL GUI applications on Windows platform.
MVC architecture is a common design framework for GUI applications, and is used in many GUI libraries, such as .NET, MFC, Qt, Java, etc. The major benefits of this MVC framework are the complete separation of system-independent OpenGL calls from Windows system and the universal message router for multiple windows. Download: glWinSimple.zip, glWin.zip Overview A diagram of MVC design MVC paradigm is to divide an application into 3 separate components; Model, View and Controller components in order to minimize dependencies between them. Model component is the brain part of the application, which contains all application data and implementations to tell how the application behaves. View component is responsible to render the visual contents onto the screen. A GUI Application: Currency Converter Here is a very simple scenario. Controller gets the button click event first. OpenVG. OpenVG is an API designed for hardware-accelerated 2D vector graphics. Its primary platforms are mobile phones, gaming & media consoles and consumer electronic devices.
It was designed to help manufacturers create more attractive user interfaces by offloading computationally intensive graphics processing from the CPU onto a GPU to save energy. OpenVG is well suited[citation needed] to accelerating Flash and mobile profile of SVG sequences. The OpenGL ES library provides similar functionality for 3D graphics. OpenVG is managed by the non-profit technology consortium Khronos Group. History[edit] The OpenVG group was formed on July 6, 2004 by a selection of major firms including 3Dlabs, Bitboys, Ericsson, Hybrid Graphics, Imagination Technologies, Motorola, Nokia, PalmSource, Symbian, and Sun Microsystems. Shortly after, Ivan Leben started another Open Source project to implement an ANSI C implementation of the specification on top of OpenGL. Implementations[edit] In hardware[edit]
Project. 1. Introduction AmanithVG is a commercial implementation of OpenVG 1.1 and 1.0.1, the application programming interface (API) for hardware accelerated 2D vector and raster graphics, created by the Khronos group. Born as a "OpenVG on OpenGL / OpenGL ES" engine, AmanithVG evolved into two different OpenVG graphic libraries.
AmanithVG GLE is entirely built on top of OpenGL 1.1+ and OpenGL ES 1.x CM, and it uses extensions where available. This engine can grant high quality vector graphics on a wide range of 3D chipset already available on the market (including the mobile market), achieving better performance than software rasterizers in terms of high resolution animations and complex special effects (transparencies, fading, realtime rotoscaling and many others). AmanithVG SRE is a pure software solution that grants a superlative vector graphics quality without to sacrifice performance on any kind of architecture / platform. 2. AmanithVG has been designed to run everywhere. 3. ShivaVG: open-source ANSI C OpenVG.
Vector graphic algorithms on CPU are more or less reaching their limits and the only hope to get software like Adobe Illustrator speeded up is probably by installing a faster processor into your PC. I've started an open-source project for a vector-graphics drawing library that would use hardware acceleration already a year ago under the name libShiva. However, it never took up really well and recently I realized why. Basically, it's the same problem as with other current open-source vector-graphics APIs that utilize graphic card. They are usually a part of a very large toolkit or framework and it's hard to use the sole drawing API without having to link your project against and make it dependent on the whole framework. This goes for projects like Qt (and it's OpenGL drawing widget) as well as Amanith, which itself depends on Qt for creaton of a window and initialization of an OpenGL context.
And here's where OpenVG came into play. Sauvage - Iceweasel. Sauvage sauvage is a Python library that displays SVG graphics using OpenGL, and is used to implement demanding interaction techniques, such as ZUI, or see-through tools. It is available on unix platforms (Linux, MacOSX) and should work on Windows, under the LGPL license. sauvage is build upon svgl concepts (a previous library I wrote in c++), but does not use code from it. Instead, sauvage is written in python, as it allows easier modification when I have new ideas on how to implement things (no compilation, no static typing when I don't need it, etc.). The goal is to design a library for OpenGL and have fast and high quality zooming features. features: all SVG shapes, styling, <use>, high quality autoscaled text, antialiasing, picking, SVG loading, images etc. API example see at the end of this page the code for the first sceenshot. download You need sauvage.tbz. Status screenshots links to similar free projects batiksmokelibartagg2zincxsvg, cairo and glitzrsvgksvg glut example sampleScene()