From 9ba99cd987fdbda41515c2c538508cf8193e8f1c Mon Sep 17 00:00:00 2001
From: lkcl <lkcl@web>
Date: Sat, 9 Oct 2021 11:49:46 +0100
Subject: [PATCH]

---
 3d_gpu/architecture/dynamic_simd/shape.mdwn | 7 +++++++
 1 file changed, 7 insertions(+)
 create mode 100644 3d_gpu/architecture/dynamic_simd/shape.mdwn

diff --git a/3d_gpu/architecture/dynamic_simd/shape.mdwn b/3d_gpu/architecture/dynamic_simd/shape.mdwn
new file mode 100644
index 000000000..d59451a0b
--- /dev/null
+++ b/3d_gpu/architecture/dynamic_simd/shape.mdwn
@@ -0,0 +1,7 @@
+# SimdShape
+
+A logical extension of the nmigen `ast.Shape` concept, `SimdShape`
+provides sufficient context to both define overrides for individual lengths
+on a per-mask basis as well as sufficient information to "upcast"
+back to a SimdSignal, in exactly the same way that c++ virtual base
+class upcasting works when RTTI (Run Time Type Information) works.
-- 
2.30.2