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This example is using a shader to produce the spotlight. A shader is a program that runs directly on your graphics card, instead of your CPU. The shader is written in its own language, GLSL, which has a similar syntax to C. You can see the shader for this example here. What (I think) this shader is doing is darkening the whole screen and setting a number of areas transparent. Then the main program that's running on your CPU is passing the shader data about where to put the spotlights (transparent areas), how big they are and the amount of bloom. This creates a spotlight effect.