Engine achievements

gistfile1.md

Achievement	Engine/Game
storing world space positions in gbuffer	STALKER
uploaded texture upside down	All Quake engines
fixed function pipeline on top of a single vertex buffer	Tesseract
made your own texture compression format that works with the driver's decoder somehow	Darkplaces (S2TC)
cleared color, depth and stencil buffers individually	idTech4
line rendering with quads	Various
per-vertex lighting	Cube, Minecraft, Gears of War, Skyrim
used facet normals	Various
manual gamma correction on sRGB textures	Various
used degenerate vertices to build triangle strip	Various
used separate vertex buffers for vertex attributes	Various
blamed it on the driver	Every engine
"fixed" shadow acne with subnormal bias	Darkplaces, Cube2, Tesseract
surface area heuristic uses hyperbolic functions	Irrlicht
scene graph is a linked list	GL Quake, Serious Sam
mixing audio in render loop	Win Quake, GL Quake
blocking on hardware occlusion queries	Various
skeletal animation done in scripting language	Total Annihilation, Natrual Selection 2
wrote a geometry shader	Various "AAA" engines
environment mapping using different sky texture	Various
block-compresssed tangent space normal maps	Various
font rendering with texture per-glyph	libass
wrote SIMD for unaligned data	idTech3, idTech4, Darkplaces, others
integrated Scaleform	Wayforward, others
shipped a debug build	Skyrim
shipped with debugger because it didn't crash in debugger	Unknown
compiled with -ffast-math and physics became more interesting	Any engine using Bullet
issued hardware occlusion queries for the HUD	Stardock (Galactic Civilizations)
render functions are virtual	Unreal 4
glReadPixels without a PBO	Various
destroyed render resources after deleting graphics context	Various
wrote software rasterizer because driver kept crashing	Epic (UT99) (Pixomatic)
level stored in XML	Various tile/side-scroller games
shipped dedicated server bins for s390x only	Battlefield 1942 (x86 came later)
"thread safe" heap allocator uses thread local storage as a heap	Unknown
game scripting language requires a SAT solver	Mono scripting (C# requires SAT)
engine depends on Qt	Wayforward (arguable though)
hybrid shader language built ontop of macros targeting GLSL and HLSL	Source 2 (togl), Doom 3 BFG, RAGE
implemented atomics using global mutex	Oberon Media
debug build is slower than running release build in valgrind	Neothyne
incremental GC is called when player takes damage	Unknown
in game updater uses bittorrent	WoW
in-house developed SWF renderer	Doom 3 BFG, RAGE
temporal blocking artefacts caused from encoding video frames with S3TC	Neothyne
added whitespace because asset hashed to the same hash as another asset	Spyro: Enter the Dragon
engine (or engine components) are shared libraries	Source 2
gimbal lock while using quaternions because euler angles still exist in pipeline	Neothyne
issued a hardware occlusion query based on a future frame (frame independent rendering)	Not disclosed
actually did something about "half pixel offset" in D3D that made things worse	Unity
used both OpenGL and D3D at the same time	CryEngine (Compute was GL)
Ported to OSx and Linux by writing a D3D to OpenGL "porting layer"	CryEngine, Source
Physics simulation fixes T-junctions in meshes each physics step	CryEngine
Syncronization primitives implemented with shared memory and files (File system sync)	CryEngine
User interface is a webbrower	Tabletop Simulator, Overgrowth, GTA V, others
Allocates all of system memory	Various
Input event processing on audio thread	Bioshock Infinite
IPC using flat files on disk	XCom
Oblique frustum is actually a cylinder	Starsiege: Tribes
SIMD math code using virtual functions	No Man's Sky
Serialized entity state as separate files (with more open FDs than a default install supports)	ARK: Survival Evolved
native Linux/MacOS OpenGL port runs slower than Windows version in Wine	Source engine
shipped with assertions enabled	Shovel Knight
bootstraps itself just so it can render its iconset	Houdini