This directory contains source snapshots retired during the Graphics/OpenGL reorganization on 2026-08-26. Files use the .cs.old suffix so that SDK-style project globbing does not compile them.

Retired without an active replacement

framework.cs.old: unused GL/debug delegate declarations.
Vulkan.*.cs.old: unreferenced Vulkan placeholders.
OpenGL.glRenderStream.ThreadSecurity.cs.old: unused thread/context fields.
OpenGL.Generated.GlCommandHistory.g.cs.old: generator report data that does not belong in the runtime assembly.

Split before retirement

gl.cs.old: image P/Invokes were temporarily split out and later retired; legacy OpenGL native helpers were replaced with direct calls through the OpenGL function table.
glfw.dtruct.cs.old: reduced to the four opaque GLFW types currently used by the wrapper in glfw.struct.cs.
OpenGL.glType.cs.old: only glSync remains active in OpenGL/glSync.cs.
ShaderEdit.ShaderGenerator.cs.old: only the temporary InternalShaderType compatibility enum remains active.
GraphicInitializer.cs.old: merged into the correctly named GraphicModule in glfw.cs.
OpenGL.glApiManager.cs.old and OpenGL.glApiManager.Const.cs.old: the active compatibility loader retains only core-version loading; the unused extension classification table and 619 write-only flags were retired.

Retired during the image simplification

Image.cs.old: the former image/decoder/OpenGL-format aggregate.
ImageInfo.cs.old and Image.Native.cs.old: the mismatched native decoder state and its P/Invoke bridge.
Pixels.cs.old: the unused and incorrectly sized legacy pixel abstraction.
CPUanimation.ImageHelper.cs.old: incomplete resizing and movement logic; image transformations now belong to a caller-selected codec or image library.
CPUanimation.IImageProvider.cs.old: the redundant image-returns-itself provider contract.
TexturePipeline.cs.old: an unused pipeline payload tied to the retired non-generic image type.
OpenGL.Buffer.AutoTexture.cs.old: the unused texture cache depended on image mutation counters and also contained incorrect slot/recycling bookkeeping.

Retired during the data-only OpenGL resource migration

Define.BufferObjectBase.cs.old and OpenGL.Buffer.GLBufferObjectBase.cs.old: the former resource base classes injected glRender/OpenGLFunction and attempted context-bound disposal from resource objects and finalizers.
OpenGL.glRenderObjectGenrator.cs.old: the former factories implicitly created resources through a render-stream instance.
OpenGL.ShaderEdit.IglConvertable.cs.old, ShaderEdit.ShaderStruct.cs.old, and ShaderEdit.InternalShaderType.cs.old: the obsolete shader conversion layer submitted uniforms through the global CurrentGL context.

Active OpenGL resource and shader types are passive handle records. Creation, binding, upload, compilation, use, and deletion are explicitly submitted to an OpenGLFunction instance.

The active Image<TPixel> is only a tightly packed managed bitmap buffer. It does not load files, convert formats, resize pixels, or retain native memory.

These files are historical references, not candidates for restoration as a group. Restore individual behavior only after checking it against the new Graphics and OpenGL architecture.