OpenGL ES 3.0 Programming Guide, Second Edition

Chapter 10. Fragment Shaders

Chapter 9, “Texturing,” introduced you to the basics of creating and applying textures in the fragment shader. In this chapter, we provide more details on the fragment shader and describe some of its uses. In particular, we focus on how to implement fixed-function techniques using the fragment shader. The topics we cover in this chapter include the following:

• Fixed function fragment shaders

• Programmable fragment shader overview

• Multitexturing

• Fog

• Alpha test

• User clip planes

In Figure 10-1, we have previously covered the vertex shader, primitive assembly, and rasterization stages of the programmable pipeline. We have talked about using textures in the fragment shader. Now, we focus on the fragment shader ...