OpenGL – Build high performance graphics

Chapter 2. The Basics of GLSL Shaders

In this chapter, we will cover:

• Implementing diffuse, per-vertex shading with a single point light source
• Implementing per-vertex ambient, diffuse, and specular (ADS) shading
• Using functions in shaders
• Implementing two-sided shading
• Implementing flat shading
• Using subroutines to select shader functionality
• Discarding fragments to create a perforated look

Introduction

Shaders were first added into OpenGL in Version 2.0, introducing programmability into the formerly fixed-function OpenGL pipeline. Shaders give us the power to implement alternative rendering algorithms and a greater degree of flexibility in the implementation of those techniques. With shaders, we can run custom code directly on the GPU, providing us with ...