Objects (#2)

* start talkin objects. * . * progress * progress. * . * . * more object progress. * note that our start is incomplete. * expand example 3 * finish example 3
Lokathor · Oct 17, 2023 · 8487834 · 8487834
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diff --git a/Cargo.toml b/Cargo.toml
@@ -8,6 +8,7 @@ license = "Zlib OR Apache-2.0 OR MIT"
 publish = false
 
 [dependencies]
+bitfrob = "1.3.0"
 voladdress = "1.3.0"
 
 [profile.dev]

diff --git a/book_src/SUMMARY.md b/book_src/SUMMARY.md
@@ -3,3 +3,4 @@
 
 * [A Basic Executable](ex1.md)
 * [User Input](ex2.md)
+* [Objects / Sprites](ex3.md)
diff --git a/book_src/ex2-white-line.png b/book_src/ex2-white-line.png
diff --git a/book_src/ex2.md b/book_src/ex2.md
@@ -153,6 +153,13 @@ With the C ABI the caller will never pass data through `r12`, and functions are
 That's all that `_start` has to do for now.
 Later it will have some setup work to do before calling `main`, but not yet.
 
+### This Is An Incomplete Start Function
+
+**NOTE:** This `_start` function is "incomplete" in the sense that it doesn't initialize RAM.
+This means that you can't use any static mutable data with non-zero initial values.
+We're not doing that right now, so that's not a problem for us right now, and we'll get to that eventually.
+But it is a non-obvious limitation worth mentioning.
+
 ## Adding `main` To `ex2.rs`
 
 Now in `ex2.rs` we need to have a `main` function that's `no_mangle`, `extern "C"`, and that doesn't ever return.

diff --git a/book_src/ex3-working-16x16.png b/book_src/ex3-working-16x16.png