• "Using OpenGL With the X Window System"
• "Extensions to OpenGL"
• "Debugging and Performance Optimization"

• "Background and Terminology"
• "Librariess, Toolkits, and Tools"
• "Integrating Your OpenGL Program With IRIS IM"
• "Summary"
• "Compiling With OpenGL and Related Libraries"

• "Using Widgets" illustrates how to create a window using IRIS IM drawing-area widgets and how to handle input and other events using callbacks.

• "Using Xlib" illustrates how to create a colormap and a window for OpenGL drawing. It also provides a brief discussion of event handling with Xlib.

• "Using Animations"
• "Using Overlays"
• "Using Visuals"
• "Using Colormaps"
• "Stereo Rendering"
• "Using Pixmaps"
• "Performance Considerations for X and OpenGL"
• "Portability"

Several extensions provide IRIS GL functionality that is not available in OpenGL 1.0. If you are porting a program from IRIS GL to OpenGL, you may therefore find some extensions particularly helpful. See Appendix A, "OpenGL and IRIS GL," for a list of IRIS GL commands and corresponding OpenGL functionality.

This chapter provides basic information about OpenGL extensions. You learn about:

• "Determining Extension Availability"
• "Finding Information About Extensions"

• "The Texture Extension"
• "The Texture Object Extension"
• "The Subtexture Extension"
• "The Copy Texture Extension"
• "The 3D Texture Extension"
• "The Texture Color Table Extension"
• "The Sharpen Texture Extension"
• "The Detail Texture Extension"
• "Texture Clamp Extensions"
• "The Texture LOD Extension"

• "Introduction to Imaging and Blending Extensions"
• "The ABGR Extension"
• "The Packed Pixels Extension"
• "The Color Matrix Extension"
• "The Convolution Extension"
• "The Histogram and Minmax Extensions"
• "The Color Table Extension"
• "The Interlace Extension"
• "Blending Extensions"

• "The Polygon Offset Extension"
• "The Vertex Array Extension"
• "The Multisample Extension"

This chapter explains how to use extensions to GLX. You learn about:

• "The Make Current Read Extension"
• "The Visual Info Extension"
• "The Visual Rating Extension"
• "The Video Synchronization Extension"
• "The Swap Control Extension"
• "The Import Context Extension"

The following sections describe extensions that are experimental:

• "The Framebuffer Configuration Extension"
• "The Pixel Buffer Extension"
• "The Video Source Extension"

Note: Using OpenGL in an X Window System environment is discussed in the following chapters of this guide:

• "Chapter 2, "OpenGL and X: Getting Started"
• "Chapter 3, "OpenGL and X: Examples"
• "Chapter 4, "OpenGL and X: Advanced Topics"

• "Ogldebug Overview"
• "Basic Debugging With ogldebug"
• "Using Menus to Interact With ogldebug"
• "Tips for Debugging Graphics Programs"

• "Why Is Tuning Useful?"
• "What Is Pipeline Tuning?"
• "Tuning Animation"
• "Optimizing Cache and Memory Use"
• "Taking Timing Measurements"

Writing high-performance code is usually more complex than just following a set of rules. Most often, it involves making trade-offs between special functions, quality, and performance for a particular application. For more information about the issues you need to consider, and for a tuning example, look at the following chapters in this book:

• "Chapter 12, "Tuning the Pipeline"
• "Chapter 13, "Tuning Graphics Applications: Examples"
• "Chapter 14, "System-Specific Tuning"

After reading these chapters, experiment with the different techniques described to help you decide where to make these trade-offs.

• "CPU Tuning: Basics"
• "CPU Tuning: Immediate Mode Drawing"
• "CPU Tuning: Display Lists"
• "CPU Tuning: Advanced Techniques"
• "Tuning the Geometry Subsystem"
• "Tuning the Raster Subsystem"
• "Tuning the Imaging Pipeline"

• "Optimizing Performance on Low-End Graphics Systems"
• "Optimizing Performance on Mid-Range Systems"
• "Optimizing Performance on Indigo2 IMPACT Systems"
• "Optimizing Performance on RealityEngine Systems"

Some points are also discussed in earlier chapters but repeated here because they result in particularly noticeable performance improvement on certain platforms.