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 shadow mapping with FBO

Shadows give important cues about the relative positioning of graphical objects. There are myriads of shadow generation techniques, including shadow volumes, shadow maps, cascaded shadow maps, and so on. An excellent reference on several shadow generation techniques is given in the See also section. We will now see how to carry out basic shadow mapping using FBO.

Getting started

For this recipe, we will use the previous scene but instead of a grid object, we will use a plane object so that the generated shadows can be seen. The code for this recipe is contained in the Chapter4/ShadowMapping directory.

How to do it…

Let us start with this recipe by following these simple steps:

  1. Create an OpenGL texture object which will be our shadow map texture. Make sure to set the clamp mode to GL_CLAMP_TO_BORDER, set the border color to {1,0,0,0}, give the texture comparison mode to GL_COMPARE_REF_TO_TEXTURE, and set the compare function to GL_LEQUAL. Set the texture internal...