2 files changed, 61 insertions, 0 deletions
diff --git a/src/devices/screen/sprite_data.rs b/src/devices/screen/sprite_data.rs
new file mode 100644
index 0000000..aade2c6
--- /dev/null
+++ b/src/devices/screen/sprite_data.rs
@@ -0,0 +1,33 @@
+pub struct SpriteData {
+    data: [u8; 16],
+    pointer: usize,
+}
+
+impl SpriteData {
+    pub fn new() -> Self {
+        Self { data: [0; 16], pointer: 0 }
+    }
+
+    pub fn push(&mut self, val: u8) {
+        self.data[self.pointer] = val;
+        self.pointer = (self.pointer + 1) % 16;
+    }
+
+    pub fn get_1bit_sprite(&self) -> [u8; 8] {
+        let mut sprite = [0u8; 8];
+        for (i, r) in sprite.iter_mut().enumerate() {
+            *r = self.data[(self.pointer + i + 8) % 16]
+        }
+        return sprite;
+    }
+
+    pub fn get_2bit_sprite(&self) -> [u8; 16] {
+        let mut sprite = [0u8; 16];
+        for (i, r) in sprite.iter_mut().enumerate() {
+            *r = self.data[(self.pointer + i) % 16]
+        }
+        return sprite;
+    }
+}
+
+
diff --git a/src/devices/screen/vector_points.rs b/src/devices/screen/vector_points.rs
new file mode 100644
index 0000000..97d95b6
--- /dev/null
+++ b/src/devices/screen/vector_points.rs
@@ -0,0 +1,28 @@
+use crate::*;
+
+pub struct VectorPoints {
+    points: [ScreenPosition; 3],
+    pointer: usize,
+}
+
+impl VectorPoints {
+    pub fn new() -> Self {
+        Self { points: [ScreenPosition::ZERO; 3], pointer: 0 }
+    }
+
+    pub fn push(&mut self, point: ScreenPosition) {
+        self.points[self.pointer] = point;
+        self.pointer = (self.pointer + 1) % 3;
+    }
+
+    pub fn get_pair(&self) -> [ScreenPosition; 2] {
+        [
+            self.points[(self.pointer + 1) % 3],
+            self.points[(self.pointer + 2) % 3],
+        ]
+    }
+
+    pub fn get_triple(&self) -> [ScreenPosition; 3] {
+        self.points
+    }
+}