Book Image

OpenGL Development Cookbook

By : Muhammad Mobeen Movania
Book Image

OpenGL Development Cookbook

By: Muhammad Mobeen Movania

Overview of this book

OpenGL is the leading cross-language, multi-platform API used by masses of modern games and applications in a vast array of different sectors. Developing graphics with OpenGL lets you harness the increasing power of GPUs and really take your visuals to the next level. OpenGL Development Cookbook is your guide to graphical programming techniques to implement 3D mesh formats and skeletal animation to learn and understand OpenGL. OpenGL Development Cookbook introduces you to the modern OpenGL. Beginning with vertex-based deformations, common mesh formats, and skeletal animation with GPU skinning, and going on to demonstrate different shader stages in the graphics pipeline. OpenGL Development Cookbook focuses on providing you with practical examples on complex topics, such as variance shadow mapping, GPU-based paths, and ray tracing. By the end you will be familiar with the latest advanced GPU-based volume rendering techniques.
Table of Contents (15 chapters)
OpenGL Development Cookbook
About the Author
About the Reviewers

Implementing a mirror with render-to-texture using FBO

We will now use the FBO to render a mirror object on the screen. In a typical offscreen rendering OpenGL application, we set up the FBO first, by calling the glGenFramebuffers function and passing it the number of FBOs desired. The second parameter stores the returned identifier. After the FBO object is generated, it has to be bound to the GL_FRAMEBUFFER, GL_DRAW_FRAMEBUFFER, or GL_READ_FRAMEBUFFER target. Following this call, the texture to be bound to the FBOs color attachment is attached by calling the glFramebufferTexture2D function.

There can be more than one color attachment on an FBO. The maximum number of color attachments supported on any GPU can be queried using the GL_MAX_COLOR_ATTACHMENTS field. The type and dimension of the texture has to be specified and it is not necessary to have the same size as the screen. However, all color attachments on the FBO must have the same dimensions. At any time, only a single FBO can be bound...