Topic summary
Glide API

Extracted from the Wikipedia article Glide (API).
Glide wrappers and emulators
Glide emulator development has been in progress since the late 1990s. During 3dfx's lifetime, the company was aggressive at trying to stop these attempts to emulate their proprietary API, shutting down early emulation projects with legal threats. However, just before it ceased operations and had its assets purchased by Nvidia, 3dfx released the Glide API, along with the Voodoo 2 and Voodoo 3 specifications, under an open-source license, which later evolved into an open-source project.