The stories in this chapter are examples of using only a few modules; instead, a lot of functionality is in the shader code. See Chapter 4 for an introduction to shaders.
Color Gradient Mapping
You can take an interesting picture uploaded as a texture to the graphics hardware , convert its colors to grayscale values, and map those to a color gradient that gets calculated in the shader. This mapping gets controlled from the outside using sound and uniform variables.
Since the vertex shader doesn’t know anything about pixel-wise colors, you will provide just the no-op vertex shader, move the ...
