OpenGL ES 3.0 Programming Guide, Second Edition

Chapter 2. Hello Triangle: An OpenGL ES 3.0 Example

To introduce the basic concepts of OpenGL ES 3.0, we begin with a simple example. This chapter shows what is required to create an OpenGL ES 3.0 program that draws a single triangle. The program we will write is just about the most basic example of an OpenGL ES 3.0 application that draws geometry. This chapter covers the following concepts:

• Creating an on-screen render surface with EGL

• Loading vertex and fragment shaders

• Creating a program object, attaching vertex and fragment shaders, and linking a program object

• Setting the viewport

• Clearing the color buffer

• Rendering a simple primitive

• Making the contents of the color buffer visible in the EGL window surface

As it turns out, ...