triangle

Documentation

Overview

Hello Triangle: the classic first OpenGL ES 2.0 program.

Demonstrates:

• Compiling a vertex shader and a fragment shader
• Linking them into a program
• Uploading triangle vertex data into a VBO
• Setting up vertex attribute pointers
• Drawing with DrawArrays
• Reading back pixels to verify the triangle was rasterized

The triangle covers the center of a 64x64 pbuffer. After rendering, the program reads back the center pixel (which should be inside the triangle) and a corner pixel (which should be the clear color) to confirm correctness.