From: Lukas Krickl <lukas@krickl.dev>
Date: Wed, 23 Apr 2025 19:20:29 +0000 (+0200)
Subject: cells: cells now have a timer just like states
X-Git-Url: https://git.krickl.dev/?a=commitdiff_plain;h=c4d1d79ca3c2a89c14a5086f28d1c52a97141c46;p=gbrg%2F.git

cells: cells now have a timer just like states

This allows easier scheduling e.g. for build timers
---

diff --git a/src/buildings.s b/src/buildings.s
index 3b47999..bebaa13 100644
--- a/src/buildings.s
+++ b/src/buildings.s
@@ -23,10 +23,6 @@ build_road:
   ld bc, c_size
   call memcpy 
 
-  call cursor_get_tile
-  ld a, BUILDING_ROAD_NORTH_SOUTH
-  call bg_update_queue_push
-
   ldnull bc
   ret
 
diff --git a/src/cells.s b/src/cells.s
index afffd51..2946925 100644
--- a/src/cells.s
+++ b/src/cells.s
@@ -5,17 +5,28 @@
   ;   de: cell ptr
   ;   bc: screen ptr 
 cell_update:
+  push de
+  inc de 
+  inc de
   inc de ; de = flags
   ld a, [de] ; a = head offset
   and a, CF_HEAD
+  pop de
   ; if not head cell return
   ret z
 
   ; save cell ptr
-  dec de ; de is c_type
   push de
-
-  inc de
+  
+  ; check timer 
+  ld a, [de] ; a = timer
+  cp a, 0
+  jr z, @update REL ; if timer is 0 update
+    dec a ; otherwise timer--
+    ld [de], a
+    pop de
+    ret
+@update:
   inc de ; de = c_st_routine 
 
   ld a, [de]
@@ -39,7 +50,6 @@ cell_update:
   or a, c
   ret z 
   
-  inc de
   inc de
   ; de = c_st_routine 
 
@@ -61,8 +71,13 @@ cell_road_update:
   ; updates the tiles 
   ; by pushing tile updates 
 cell_road_init:
+  push bc
+  pop hl ; hl = ptr to tile 
+  ld a, BUILDING_ROAD_NORTH_SOUTH
+  call bg_update_queue_push
+  
   ld bc, cell_road_update
   ret
 
 cell_template_road:
-  c_def C_ROAD, CF_HEAD, cell_road_init
+  c_def 0, cell_road_init, CF_HEAD 
diff --git a/src/defs.s b/src/defs.s
index 8f4d458..4011df4 100644
--- a/src/defs.s
+++ b/src/defs.s
@@ -51,14 +51,14 @@
   ; game state cell struct 
   ; this holds all the information 
   ; a cell on the map has 
+  ; cells are a reduced version of states
+  ; without a default next value and additional flags
 .se 0
-  ; cell type/cell gfx
-.de c_type, 1
-.de c_flags, 1
-  ; if c_st_rotuine 
-  ; is unsued (true for all non-head cells)
-  ; this space can be used by the head cell
-  ; to store data
+  ; cell delay timer only used for head cell
+  ; when it reaches 0 the next state is called
+.de c_time, 1
+  ; type/gfx or custom data for non-head cells
+.de c_type, 0
 .de c_st_data, 0 
   ; this is the same as st routine, 
   ; but tiles do not have a timer or 
@@ -73,6 +73,11 @@
   ;   de: cell ptr 
   ;   bc: screen ptr
 .de c_st_routine, 2 
+.de c_flags, 1
+  ; if c_st_rotuine 
+  ; is unsued (true for all non-head cells)
+  ; this space can be used by the head cell
+  ; to store data
 .de c_size, 0
 
   ; cell type enum
@@ -87,7 +92,11 @@
 #define CURSOR_MIN_Y 0 
 #define CURSOR_MAX_Y 0xB8
 
-  ; state struct 
+  ; state struct
+  ; states are intended to 
+  ; be used as part of a larger
+  ; struct 
+  ; e.g. player state
 .se 0
   ; time until next state
 .de st_time, 1
diff --git a/src/macros.inc b/src/macros.inc
index a4f6367..b1fefaa 100644
--- a/src/macros.inc
+++ b/src/macros.inc
@@ -130,13 +130,13 @@
 
   ; defines a new cell template
   ; inputs:
-  ;   $1: c_type
-  ;   $3: c_flags
+  ;   $1: c_time
   ;   $2: c_st_routine
+  ;   $3: c_flags
 #macro c_def
   .db $1
-  .db $2
-  dw $3
+  dw $2
+  .db $3
 #endmacro
 
   ; loads NULL into a 16 bit register
diff --git a/src/simulation.s b/src/simulation.s
index dd2f8a0..857a09a 100644
--- a/src/simulation.s
+++ b/src/simulation.s
@@ -41,17 +41,16 @@ sim_update:
   ld a, SIM_UPDATE_MAX+1
   push af
 @loop:
-
-    ; advance to next cell
-    .rep i, c_size, 1, inc de
-    inc bc
-    
     push de
     push bc
     call cell_update
     pop bc
     pop de
     pop af
+
+    ; advance to next cell
+    .rep i, c_size, 1, inc de
+    inc bc
     
     ; loop counter--
     dec a