From e8d1438d09f0a52eb76500170510c193e6331ed8 Mon Sep 17 00:00:00 2001
From: Patrick Kingston <patrick@pkingston.xyz>
Date: Sat, 14 Feb 2026 23:03:18 -0500
Subject: Use rule and init from settings

---
 main.fab      | 126 +++++++++++++++++++++++++++++++++++++++++++++++++---------
 nEs.nes       | Bin 40976 -> 40976 bytes
 nEslabels.mlb |  48 ++++++++++++----------
 3 files changed, 134 insertions(+), 40 deletions(-)

diff --git a/main.fab b/main.fab
index dcf985c..607ebb5 100644
--- a/main.fab
+++ b/main.fab
@@ -6,17 +6,15 @@ vars /ecavars
   U current_rule = %01001001
 
 fn init_eca_state()
-  // Scroll to attributes
-  ppu_reset_addr($2000 + 960)
-  // Set attributes for background
-  for U i = 0; i < 64; i+= 1
-    {PPUDATA}(%11111111)
-
-  // Init the buffer to zero
-  buf = U[64]()
-  // Add an initial cell
-  buf[16] = 1
+  {PPUMASK}(~PPUMASK_ON)
+  // Clear display and set attributes
+  ppu_reset_addr($2000)
+  for UU i = 0; i < 1024; i += 1
+    {PPUDATA}(%00000000)
 
+  // Reset drawing row offset
+  drawing_row_offset = 0 
+  {PPUMASK}(PPUMASK_ON)
 
 fn assemble_code(U left, U middle, U right) U
   U out = %00000000
@@ -107,10 +105,10 @@ nmi eca_nmi()
   // Turn on rendering sprites and bg
   ppu_upload_oam_poll_pads(0)
 
-  {PPUMASK}(PPUMASK_ON | PPUMASK_NO_CLIP)
-
   upload_curr_gen()
 
+  {PPUMASK}(PPUMASK_BG_ON | PPUMASK_NO_CLIP)
+
   ppu_reset_scroll(0, 0)
 
 // Main mode for running the ECA
@@ -171,19 +169,111 @@ vars /settings_vars
   U slow_counter = 0
   U editing_rule = 1 // Start off editing the rule
   U rule_pos = 0 // Start off on highest bit
-  U generation_pos = 0
+  U init_pos = 0
   U cursor_x = 0
   U cursor_y = 0
   U cursor_frame = 0
   U loaded = 0
+  U should_update_tile = 0
+  U tile_to_update = 0
+  U zero = 71
+  U one = 72
+
+fn upload_cursor()
+    // Our stack index into OAM:
+    U i = 0
+
+    // Push a sprite:
+    set_oam_x(i, cursor_x)     // x-position
+    set_oam_y(i, cursor_y - 1) // y-position
+    set_oam_p(i, $49 + cursor_frame)    // tile
+    set_oam_a(i, 0)      // options
+    i += 4
+
+    // Clear the remainder of OAM
+    hide_oam(i)
+
+fn update_cursor()
+  if slow_counter == 0
+    cursor_frame += 1
+    if cursor_frame == 8
+      cursor_frame = 0
+
+  if pads[0].pressed & BUTTON_UP
+    editing_rule = 1
+  else if pads[0].pressed & BUTTON_DOWN
+    editing_rule = 0
+
+  if editing_rule
+    if pads[0].pressed & BUTTON_LEFT
+      if rule_pos == 0
+        rule_pos = 8 // loop back around
+      rule_pos -= 1
+    else if pads[0].pressed  & BUTTON_RIGHT
+      rule_pos += 1
+      if rule_pos == 8
+        rule_pos = 0 // loop back around
+
+    if pads[0].pressed & BUTTON_A
+      U mask = U(1) << (7 - rule_pos)
+      current_rule ^= mask
+      if current_rule & mask
+        tile_to_update = one
+      else
+        tile_to_update = zero
+      should_update_tile = 1
+
+    // Find the cursor position
+    cursor_x = 5
+    cursor_y = 8
+    if rule_pos > 3
+      cursor_x += 7 * (rule_pos - 4)
+      cursor_y += 3
+    else
+      cursor_x += 7 * rule_pos
+
+    // Scale it
+    cursor_x <<= 3
+    cursor_y <<= 3
+  else
+    if pads[0].pressed & BUTTON_LEFT
+      if init_pos == 0
+        init_pos = 32 // loop back around
+      init_pos -= 1
+    else if pads[0].pressed  & BUTTON_RIGHT
+      init_pos += 1
+      if init_pos == 32
+        init_pos = 0 // loop back around
+
+    if pads[0].pressed & BUTTON_A
+      U tile = buf[curr_gen + init_pos]
+      if tile // Not sure if I can just do buf[curr_gen + init_pos] = !tile
+        buf[curr_gen + init_pos] = 0
+        tile_to_update = zero
+      else
+        buf[curr_gen + init_pos] = 1
+        tile_to_update = one
+
+      should_update_tile = 1
+
+    cursor_x = init_pos << 3  // Uses the whole row
+    cursor_y = 160
 
 nmi settings_nmi()
   // Turn on rendering sprites and bg
   ppu_upload_oam_poll_pads(0)
 
+  if should_update_tile
+    ppu_reset_addr($2000 + (UU(cursor_x) >> 3) + ((UU(cursor_y) & %11111000) << 2))
+    {PPUDATA}(tile_to_update)
+    should_update_tile = 0
+
   if loaded
     {PPUMASK}(PPUMASK_ON | PPUMASK_NO_CLIP)
 
+  slow_counter += 1
+  if slow_counter == 4 // Slow counter "ticks" every 4 frames
+    slow_counter = 0
   ppu_reset_scroll(0, 0)
 
 mode settings()
@@ -207,18 +297,18 @@ mode settings()
 
   {PPUMASK}(PPUMASK_ON)
 
-  // Set the init to the current generation and set the rule to the current rule
-  // TODO ^
-
+  buf = U[64]() // Reset the buffer to all 0s
   while true
     nmi
     update_pads()
-    //update_cursor()
-    //upload_cursor()
+    update_cursor()
+    upload_cursor()
     if pads[0].released & BUTTON_START
       goto mode eca_main()
       : preserves /ecavars
 
+    
+
 charmap titlemap(".#-=N!@~E$%^S&*(C)_+A{}|12345678qwertyuiop<asd>")
 
 data /titlescreen
diff --git a/nEs.nes b/nEs.nes
index c915bf2..f88b32a 100644
Binary files a/nEs.nes and b/nEs.nes differ
diff --git a/nEslabels.mlb b/nEslabels.mlb
index dab4ef8..29e3e6a 100644
--- a/nEslabels.mlb
+++ b/nEslabels.mlb
@@ -1,17 +1,18 @@
-NesPrgRom:001015:calc_next_cell@0_0:
-NesPrgRom:000E88:calc_and_advance_gen@0_0:
-NesPrgRom:000E91:calc_and_advance_gen@0_0_entry:
-NesPrgRom:000F12:eca_nmi@0_1:
-NesPrgRom:000F94:eca_main@0_0:
-NesPrgRom:0010B7:settings_nmi@0_1:
+NesPrgRom:001202:calc_next_cell@0_0:
+NesPrgRom:001088:calc_and_advance_gen@0_0:
+NesPrgRom:001091:calc_and_advance_gen@0_0_entry:
+NesPrgRom:001112:eca_nmi@0_1:
+NesPrgRom:000F05:eca_main@0_0:
+NesPrgRom:000C50:update_cursor@0_0:
+NesPrgRom:001194:settings_nmi@0_1:
 NesPrgRom:00076D:settings@0_0:
-NesPrgRom:000CCE:main_nmi@0_1:
-NesPrgRom:000CD1:main_nmi@0_1_entry:
+NesPrgRom:000E61:main_nmi@0_1:
+NesPrgRom:000E64:main_nmi@0_1_entry:
 NesPrgRom:000279:main@0_0:
 NesPrgRom:000238:ppu_upload_oam_poll_pads@0_1:
-NesPrgRom:001082:update_pads@0_0:
-NesPrgRom:000C15:ppu_upload_palette@0_0:
-NesPrgRom:000855-000C14:settingschars@0_0:
+NesPrgRom:00126F:update_pads@0_0:
+NesPrgRom:000DA8:ppu_upload_palette@0_0:
+NesPrgRom:000890-000C4F:settingschars@0_0:
 NesPrgRom:00038D-00076C:title@0_0:
 NesPrgRom:007FFA-007FFF:runtime_vectors@0_0:
 NesPrgRom:00011C-00012F:runtime_nmi@0_1:
@@ -33,26 +34,29 @@ NesPrgRom:0001E3-000228:runtime_mul8@0_2:
 NesPrgRom:000100-00010F:runtime_shl4_table@0_0:
 NesPrgRom:000110-000117:runtime_shl5_table@0_0:
 NesPrgRom:000118-00011B:runtime_shl6_table@0_0:
-R:0326:buf@0:
+R:031F:buf@0:
 R:000D:curr_gen@0:
 R:0010:next_gen@0:
 R:000E:drawing_row_offset@0:
 R:000F:drawing_row_offset@1:
 R:0011:current_rule@0:
-R:031F:slow_counter@0:
-R:0325:editing_rule@0:
-R:0320:rule_pos@0:
-R:0321:generation_pos@0:
-R:0322:cursor_x@0:
-R:0323:cursor_y@0:
-R:0324:cursor_frame@0:
-R:0014:loaded@0__wipeline@0:
-R:0015:wipeline@1:
+R:0012:slow_counter@0__wipeline@0:
+R:001D:editing_rule@0:
+R:0013:rule_pos@0__wipeline@1:
+R:0014:init_pos@0:
+R:0015:cursor_x@0:
+R:0016:cursor_y@0:
+R:0017:cursor_frame@0:
+R:0018:loaded@0:
+R:0019:should_update_tile@0:
+R:001A:tile_to_update@0:
+R:001E:zero@0:
+R:001F:one@0:
 R:0200:oam@0:
 R:0319:pads@0:
 R:031B:pads@1:
 R:031D:pads@2:
-R:0012:raw_pads@0:
+R:001B:raw_pads@0:
 R:0300:palette@0:
 R:0001:runtime_ptr_temp@0:
 R:0003:runtime_ptr_temp@1:
-- 
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