Initial Vectorail Core library

README.md

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+# Vectorail Core
+
+Reusable SDL 3 and OpenGL composition primitives extracted from Vectorail.
+The library deliberately contains no game rules and no Groove Coaster format
+knowledge.
+
+## Scope
+
+- OpenGL function loading and shader helpers;
+- spline evaluation used by rail renderers;
+- PNG and uncompressed DDS texture upload helpers;
+- portable SDL/OpenGL integration shared by applications built on Vectorail.
+
+## Build
+
+```sh
+cmake -S . -B build
+cmake --build build
+cmake --install build --prefix /desired/prefix
+```
+
+Dependencies are SDL 3, OpenGL, libpng, and GLM. Consumers link the exported
+`Vectorail::Core` CMake target.
+
+Vectorail Core is distributed under the BSD 3-Clause License.
+