Dan Ginsburg & John Kessenich 
OpenGL Shading Language [PDF ebook] 

Open GL(R) Shading Language, Third Edition, extensively updated for Open GL 3.1, is the experienced application programmer’s guide to writing shaders. Part reference, part tutorial, this book thoroughly explains the shift from fixed-functionality graphics hardware to the new era of programmable graphics hardware and the additions to the Open GL API that support this programmability. With Open GL and shaders written in the Open GL Shading Language, applications can perform better, achieving stunning graphics effects by using the capabilities of both the visual processing unit and the central processing unit. In this book, you will find a detailed introduction to the Open GL Shading Language (GLSL) and the new Open GL function calls that support it. The text begins by describing the syntax and semantics of this high-level programming language. Once this foundation has been established, the book explores the creation and manipulation of shaders using new Open GL function calls. Open GL(R) Shading Language, Third Edition, includes updated descriptions for the language and all the GLSL entry points added though Open GL 3.1, as well as updated chapters that discuss transformations, lighting, shadows, and surface characteristics. The third edition also features shaders that have been updated to Open GL Shading Language Version 1.40 and their underlying algorithms, including Traditional Open GL fixed functionality Stored textures and procedural textures Image-based lighting Lighting with spherical harmonics Ambient occlusion and shadow mapping Volume shadows using deferred lighting Ward’s BRDF model The color plate section illustrates the power and sophistication of the Open GL Shading Language. The API Function Reference at the end of the book is an excellent guide to the API entry points that support the Open GL Shading Language.