fix: mangled drawing in hires mode

The loop iterating through the rows of a 16x16 hires sprite would take non-disjoint 2-byte chunks per row, which led to mangled sprite drawing. It now correctly takes disjoint 2-byte windows per row.
nikoof · Nov 24, 2023 · 3d5aa7d · 3d5aa7d
1 parent 77c6ef3
commit 3d5aa7d
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/src/interpreter/schip.rs b/src/interpreter/schip.rs
@@ -296,8 +296,8 @@ where
                                 break;
                             }
                             let sprite_row = u16::from_be_bytes([
-                                self.memory[self.index + y_offset],
-                                self.memory[self.index + y_offset + 1],
+                                self.memory[self.index + 2 * y_offset],
+                                self.memory[self.index + 2 * y_offset + 1],
                             ]);
                             for x_offset in 0..16 {
                                 if x + x_offset >= DISPLAY_WIDTH {