Fireworks in OpenGL (university assignment)

There's currently two kinds of particles:

• Spark particles, which briefly flash and fade out, and
• Spawners, which launch into the air and explode, causing sparks to appear a couple of times.

A number of spawners are launched automatically, but the following controls can be used to manually launch spawners or clear the screen.

• Space launches a single spawner;
• Enter launches multiple spawners at the same time;
• F5 and R removes all particles, clearing the screen.