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OpenGL 4.0 Shading Language Cookbook

You're reading from   OpenGL 4.0 Shading Language Cookbook With over 60 recipes, this Cookbook will teach you both the elementary and finer points of the OpenGL Shading Language, and get you familiar with the specific features of GLSL 4.0. A totally practical, hands-on guide.

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Product type Paperback
Published in Jul 2011
Publisher Packt
ISBN-13 9781849514767
Length 340 pages
Edition 1st Edition
Tools
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Toc

Table of Contents (16) Chapters Close

OpenGL 4.0 Shading Language Cookbook
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
1. Getting Started with GLSL 4.0 FREE CHAPTER 2. The Basics of GLSL Shaders 3. Lighting, Shading Effects, and Optimizations 4. Using Textures 5. Image Processing and Screen Space Techniques 6. Using Geometry and Tessellation Shaders 7. Shadows 8. Using Noise in Shaders 9. Animation and Particles Index

Drawing a wireframe on top of a shaded mesh


The preceding recipe demonstrated the use of a geometry shader to produce a different variety of primitive than it received. Geometry shaders can also be used to provide additional information to later stages. They are quite well suited to do so because they have access to all of the vertices of the primitive at once, and can do computations based on the entire primitive rather than a single vertex.

This example involves a geometry shader that does not modify the triangle at all. It essentially passes the primitive along unchanged. However, it computes additional information about the triangle that will be used by the fragment shader to highlight the edges of the polygon. The basic idea here is to draw the edges of each polygon directly on top of the shaded mesh.

The following image shows an example of this technique. The mesh edges are drawn on top of the shaded surface by using information computed within the geometry shader.

There are many techniques...

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