OpenGL News Archives
Addison-Wesley has provided OpenGL.org with a sample chapter from The OpenGL Programming Guide 4th Edition (Redbook) for download (1.2MB PDF). This is the must-have book for every OpenGL programmer. The sample Chapter 9 covers texturing mapping. After reading this chapter you should be able to:
- Specify texture images in compressed and uncompressed formats
- Control how a texture image is filtered as it’s applied to a fragment
- Create and manage texture images in texture objects and, if available, control a high-performance working set of those texture objects
- Specify how the color values in the image combine with those of the fragment to which it’s being applied
- Supply texture coordinates to indicate how the texture image should be aligned with the objects in your scene
- Generate texture coordinates automatically to produce effects such as contour maps and environment maps
- Perform complex texture operations in a single pass with multitexturing (sequential texture units)
- Use texture combiner functions to mathematically operate on texture, fragment, and constant color values
- After texturing, process fragments with secondary colors
- Perform transformations on texture coordinates using the texture matrix
- Render shadowed objects, using depth textures
Crystal Space is an Open Source 3D Engine that uses the OpenGL API on Linux, Windows, and MacOS/X. v0.98r002 has much better support for advanced OpenGL features (shaders, vertex and fragment programs, stencil shadows, etc). In general Crystal Space has become faster and more mature. One important thing in this release is that the new renderer architecture is much more usable. It is still not enabled as default because some important parts are still missing but if you only need OpenGL and don’t depend on volumetric fog then it is strongly recommend to use the new renderer architecture. Other features include support for cal3d models (skeletal animation), a new terrain engine that supports splatting (combining multiple textures dynamically) and scattering, and updated and enhanced documentation.
Khronos has announced that it has created two new API initiatives as compliments to OpenGL ES and OpenML. The OpenVG API that will provide a low-level hardware acceleration interface for vector graphics libraries such as Flash and SVG on handheld devices. The OpenMAX API will standardize access to media processing primitives, used extensively in graphics libraries and video codecs such as OpenGL ES and MPEG-4, to rapidly and effectively make use of the full acceleration potential of new silicon.
This article provides an introduction to writing pixel shaders with the Cg shader programming language and using them in OpenGL with the ARB_fragment_program extension. It contains sample C and Cg code and is accompanied by a simple diffuse lighting demo with full source code.
The GP2 workshop, to be held the Saturday and Sunday before SIGGRAPH 2004 at the SIGGRAPH headquarter hotel, will explore current issues in general-purpose computing using graphics hardware. These issues include:
- Do GPUs have the potential of being a useful co-processor for a wide variety of applications? What are their algorithmic and architectural niches and can these be broadened?
- What are the major issues in terms of programmability, language and compiler support and software environments for GPUs?
- What are some of the future technology trends that can lead to more widespread use of GPUs?
J-Ball builds on the classic game Jezzball. It uses an OpenGL API -based engine for rendering. Ths site features screenshots and more free OpenGL programs.
Sun has announced that the source code for the core Java 3D API, vecmath, the Java 3D core
utilities, and the Java 3D program examples have been released under the Java Research and BSD licenses. Java3D supports OpenGL API-hardware acceleration.
Maya Unlimited, the 3D animation and visual fx tool will come to Mac OS X by late summer 2004, including all tools that are available to artists with Maya Unlimited 6. Maya Unlimited requires an OpenGL API hardware accelerator.
Core Image allows developers to leverage OpenGL and GPU rendering for very fast image processing. Effects and transitions can be expressed with a few lines of code for real-time, interactive responsiveness as you select and apply filters. Core Video will provide a modern foundation for video services in Mac OS X Tiger. It provides a bridge between QuickTime and the GPU for hardware-accelerated video processing. This highly-optimized pipeline for video presentation increases performance and reduces CPU load, freeing up resources for other operations.
Refering to the OpenGL API-based Keyhole software, Newsweek magazine writes: “There it is, that good old pale blue dot in all its earthly glory, right there on your computer screen. It’s a familiar sight, even from a sky-high perspective experienced only by astronauts and angels. But hold on. By mousing around and clicking, you swoop like Superman, down, down, down, to a location on terra firma. Coastlines and rivers come into view, then cities, houses and even cars. And then, with another mouseclick, you can see the roads labeled, highlight the high-crime areas and locate the nearest Chinese restaurant”
MeVisLab is a research and prototyping platform for medical image processing and visualization and is used to develop scientific methods for computer assistance in medicine in general and radiology in particular. The OpenGL API is used extensively for 2D and 3D visualization. The GigaVoxelRenderer is a scalable, octree based, hardware-accelerated volume renderer capable of displaying large volumes. MeVisLab is free for non-commercial use, an SDK is also available. License restrictions apply.
DevLib is designed to make multimedia productions (games, screen-savers, demos.) easier and more intuitive to write. The new DevLib v1.4 is till compatible with DevCpp and VC7, using a better OpenGL abstraction, and released under LGPL license. This version also introduces support for fog, stencil buffer, lighting, device queries, log output, support for the OpenGL Extension Wrangler library and more.
Soft Body 3.0 simulates real time soft body behavior using an original pressure model. The free sample application for Windows uses the OpenGL API and GLUT.
Cedega (formerly known as WineX) allows Windows based games to run on
Linux, out-of-the-box, seamlessly and transparently. The new Cedega
4.0 supports DirectX 9.0 that works on top of the OpenGL 1.5 API,
including advanced Pixel and Vertex shaders. Cedega 4.0 also includes a
new advanced inter-process communication architecture that can double
the speed of games which make heavy use of Win32 kernel synchronization
Drome Engine is a 3D game engine written in C++ and using the OpenGL API. It currently supports dynamic lightmaps, stenciled shadow volumes, sky domes, shaders, particle effects, and TrueType fonts (using FreeType 2). The new v0.2.8. includes a a first-person perspective demo and 3 maps/levels.