From ff6e784e7c5ebe223666c6c631305397ad358289 Mon Sep 17 00:00:00 2001
From: Bad Diode <bd@badd10de.dev>
Date: Sun, 23 Apr 2023 15:48:59 +0200
Subject: Start decoupling of rendering from update passes

---
 src/save.c | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 src/save.c

(limited to 'src/save.c')

diff --git a/src/save.c b/src/save.c
new file mode 100644
index 0000000..45a099d
--- /dev/null
+++ b/src/save.c
@@ -0,0 +1,37 @@
+//
+// Save data.
+//
+
+typedef struct Metadata {
+    u8 blank;
+    u32 magic;
+    int current_bank;
+    int current_pattern;
+} Metadata;
+
+static Metadata metadata = {0};
+
+void
+sram_read(u8 *dst, u16 pos, u16 n_bytes) {
+    for (size_t i = 0; i < n_bytes; ++i) {
+        dst[i] = SRAM[pos + i];
+    }
+}
+
+void
+sram_write(u8 *src, u16 pos, u16 n_bytes) {
+    for (size_t i = 0; i < n_bytes; ++i) {
+        SRAM[pos + i] = src[i];
+    }
+}
+
+void
+save_bank(int i) {
+    sram_write(&patterns, sizeof(Metadata) + i * sizeof(patterns), sizeof(patterns));
+}
+
+void
+load_bank(int i) {
+    sram_read(&patterns, sizeof(Metadata) + i * sizeof(patterns), sizeof(patterns));
+}
+
-- 
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