TM OpenGL® The Industry’s Foundation for High-Performance Graphics Developer-Driven Advantages ■ Industry standard. An independent consortium, the OpenGL Architecture Review Board, guides the OpenGL specification. With broad industry support, OpenGL is the only truly open, vendor-neutral, multiplatform graphics standard. ■ Stable. OpenGL implementations have been avail- able for more than seven years on a wide variety of platforms. Additions to the specification are well controlled, and proposed updates are announced in time for developers to adopt changes. Backward compatibility requirements ensure that existing applications do not become obsolete. ■ Reliable and portable. All OpenGL applications produce consistent visual display results on any OpenGL API-compliant hardware, regardless of operating system or windowing system. ■ Evolving. Because of its thorough and forward- looking design, OpenGL allows new hardware innova- tions to be accessible through the API via the OpenGL Most Widely Adopted Graphics Standard extension mechanism. In this way, innovations appear OpenGL is the premier environment for developing in the API in a timely fashion, letting application portable, interactive 2D and 3D graphics applications. developers and hardware vendors incorporate new Since its introduction in 1992, OpenGL has become features into their normal product release cycles. the industry’s most widely used and supported 2D and ■ Scalable. OpenGL API-based applications can run 3D graphics application programming interface (API), on systems ranging from consumer electronics to bringing thousands of applications to a wide variety PCs, workstations, and supercomputers. As a result, of computer platforms. OpenGL fosters innovation applications can scale to any class of machine that and speeds application development by incorporating the developer chooses to target. a broad set of rendering, texture mapping, special ■ effects, and other powerful visualization functions. Easy to use. OpenGL is well structured with an intu- Developers can leverage the power of OpenGL across itive design and logical commands. Efficient OpenGL all popular desktop and workstation platforms, routines typically result in applications with fewer lines ensuring wide application deployment. of code than those that make up programs generated using other graphics libraries or packages. In addition, High Visual Quality and Performance OpenGL drivers encapsulate information about the Any visual computing application requiring maximum underlying hardware, freeing the application developer performance—from 3D animation to CAD to visual from having to design for specific hardware features. simulation—can exploit high-quality, high-perfor- ■ Well-documented. Numerous books have been mance OpenGL capabilities. These capabilities allow published about OpenGL, and a great deal of sample developers in diverse markets such as broadcasting, code is readily available, making information about CAD/CAM/CAE, entertainment, medical imaging, OpenGL inexpensive and easy to obtain. and virtual reality to produce and display incredibly compelling 2D and 3D graphics. Datasheet The OpenGL Visualization Programming Pipeline IMAGING PATH Image Unpack Pixels Pixel Operations Image Rasterization Display Lists Texture Memory Fragment Operations TO FRAME BUFFER GEOMETRY PATH Geometry Unpack Vertices Vertex Operations Geometric Rasterization OpenGL operates on image data as well as geometric primitives. Simplifies Software Development, Speeds Architected for Flexibility and Differentiation Time-to-Market Although the OpenGL specification defines a particular OpenGL routines simplify the development of graphics graphics processing pipeline, platform vendors have the software—from rendering a simple geometric point, line, freedom to tailor a particular OpenGL implementation or filled polygon to the creation of the most complex lighted to meet unique system cost and performance objectives. and texture-mapped NURBS curved surface. OpenGL gives Individual calls can be executed on dedicated hardware, software developers access to geometric and image primitives, run as software routines on the standard system CPU, display lists, modeling transformations, lighting and texturing, or implemented as a combination of both dedicated hard- anti-aliasing, blending, and many other features. ware and software routines. This implementation flexibility Every conforming OpenGL implementation includes the full means that OpenGL hardware acceleration can range from complement of OpenGL functions. The well-specified OpenGL simple rendering to full geometry and is widely available standard has language bindings for C, C++, Fortran, Ada, and on everything from low-cost PCs to high-end workstations Java™. All licensed OpenGL implementations come from and supercomputers. Application developers are assured a single specification and language binding document and are consistent display results regardless of the platform imple- required to pass a set of conformance tests. Applications mentation of the OpenGL environment. utilizing OpenGL functions are easily portable across a wide Using the OpenGL extension mechanism, hardware developers array of platforms for maximized programmer productivity can differentiate their products by developing extensions that and shorter time-to-market. allow software developers to access additional performance All elements of the OpenGL state—even the contents of the and technological innovations. texture memory and the frame buffer—can be obtained by an OpenGL application. OpenGL also supports visualization API Hierarchy applications with 2D images treated as types of primitives that can be manipulated just like 3D geometric objects. As shown in the OpenGL visualization programming pipeline diagram WINDOWS APPLICATION UNIX APPLICATION above, images and vertices defining geometric primitives are passed through the OpenGL pipeline to the frame buffer. GLU GLU Available Everywhere Supported on all UNIX® workstations, and shipped standard GDUWGL OpenGL XlibGLX OpenGL with every Windows NT® and Windows® 95 PC, no other graphics API operates on a wider range of hardware platforms ■ OpenGL applications use the window system’s and software environments. OpenGL runs on every major window, input, and event mechanism operating system including Mac® OS, OS/2®, UNIX, Windows ■ GLU supports quadrics, NURBS, complex polygons, 95, Windows NT, Linux, OPENStep, Python, and BeOS; matrix utilities, and more it also works with every major windowing system, including Presentation Manager, Win32, and X/Window System™. This diagram demonstrates the relationship between OpenGL OpenGL is callable from Ada, C, C++, Fortran, and Java GLU and windowing APIs. and offers complete independence from network protocols and topologies. The Foundation for Advanced APIs OpenGL Applications (partial list) Leading software developers use OpenGL, with its robust Company Application rendering libraries, as the 2D/3D graphics foundation for higher-level APIs. Developers leverage the capabilities of 3D ANIMATION AND MODELING OpenGL to deliver highly differentiated, yet widely supported Alias|Wavefront Maya™ vertical market solutions. For example, Open Inventor™ Byte by Byte Soft F/X 3D provides a cross-platform user interface and flexible scene Caligari truSpace graph that makes it easy to create OpenGL applications. CrystalGraphics Crystal 3D Impact Pro IRIS Performer™ leverages OpenGL functionality and delivers Hash Inc. Hash 3D Animation System additional features tailored for the demanding high frame rate Hollywood FX Inc. Hollywood FX markets such as visual simulation and virtual sets. OpenGL Kinetix 3D Studio Max, Character Studio Optimizer™ is a toolkit for real-time interaction, modification, Lightscape Lightscape MultiGen GameGen™, MultiGen® Creator and rendering of complex surface-based models such as Newtek LightWave 3D those found in CAD/CAM and special effects creation. The Nichimen Graphics N-World Fahrenheit Scene Graph, scheduled for release in 1999, will Softimage Digital Studio, Softimage 3D® leverage OpenGL capabilities to provide a platform for appli- Strata StudioPro™ cations and APIs across diverse market segments, allowing Template Graphics Software LiveWork 3D, 3Space Publisher reduced development time, maximized performance, and high visual quality. CAD/CAM & DIGITAL PROTOTYPING ® Governance Bentley Systems MicroStation CoCreate SolidDesigner The OpenGL Architecture Review Board (ARB), an inde- Dassault Systèmes CATIA® pendent consortium formed in 1992, governs the OpenGL EDS Unigraphics Unigraphics® specification. Composed of members from many of the Kinetix 3D Studio VIZ industry’s leading graphics vendors, the ARB defines confor- Matra Datavision EUCLID Quantum mance tests and approves OpenGL enhancements. Currently Parametric Technology Corp. Pro/ENGINEER®, PT/Modeler the board includes representatives from Compaq, Evans Parasolid UG/Creator & Sutherland, Hewlett-Packard, IBM, Intel, Intergraph, SDRC I-DEAS™ Microsoft, and Silicon Graphics. The OpenGL ARB Web SolidWorks SolidWorks site can be found at www.opengl.org. The OpenGL Performance Characterization Committee, VISUAL SIMULATION AND VIRTUAL REALITY another independent organization, creates and maintains Advanced Visual Systems AVS/Express™ OpenGL benchmarks and publishes the results of those Coryphaeus Software Designer’s Workbench™ benchmarks on its Web site: DataPath RealiMation www.specbench.org/gpc/opc.static/index.html. IBM Visualization Data Explorer MultiGen