Figure 7-9. Per-vertex colored triangle

Woah, this is pretty neat. We didn't make any assumptions about how OpenGL ES will use the three colors we specified (red for the bottom-left vertex, green for the bottom-right vertex, and blue for the top vertex). It turns out that it will interpolate the colors between the vertices for us. With this we can easily create nice gradients. However, colors alone will not make us happy for very long. We want to draw images with OpenGL ES. And that's where so-called texture mapping comes into play.

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