use automata and hardware constants in render

Code/automata.asm

@@ -1,11 +1,5 @@
 INCLUDE "hardware.inc"
-
-CELLS_WIDTH = 40
-CELLS_HEIGHT = 36
-CELLS_PER_TILE = 2 
-TILE_WIDTH = CELLS_WIDTH / CELLS_PER_TILE
-TILE_HEIGHT = CELLS_HEIGHT / CELLS_PER_TILE
-BUFFER_SIZE = TILE_WIDTH * TILE_HEIGHT
+INCLUDE "automata.inc"
 
 ; automata buffers with 4 cells per byte	
 ; 2x2 bytes per cell, bit ordering:

Code/automata.inc

@@ -0,0 +1,6 @@
+CELLS_WIDTH = 40
+CELLS_HEIGHT = 36
+CELLS_PER_TILE = 2 
+TILE_WIDTH = CELLS_WIDTH / CELLS_PER_TILE
+TILE_HEIGHT = CELLS_HEIGHT / CELLS_PER_TILE
+BUFFER_SIZE = TILE_WIDTH * TILE_HEIGHT

Code/render.asm

@@ -1,5 +1,6 @@
 INCLUDE "hardware.inc"
 INCLUDE "utils.inc"
+INCLUDE "automata.inc"
 
 RENDER_IN_HBL EQU 0
 
@@ -71,7 +72,7 @@ LCDStatInterruptHandler:
 
 	; go to next line
 	ld a, e
-	add a, 32 - 20
+	add a, SCRN_VX_B - TILE_WIDTH
 	ld e, a
 	jr nc, .nocarry
 	inc d
@@ -82,7 +83,7 @@ LCDStatInterruptHandler:
 	jr z, .finish
 	
 	; reset tile counter
-	ld c, 20 
+	ld c, TILE_WIDTH
 
 	jr .loop
 
@@ -118,7 +119,7 @@ LCDStatInterruptHandler:
 EXPORT InitRender
 SECTION "Init render", ROM0
 InitRender:
-	ld a, $9C
+	ld a, HIGH(_SCRN1)
 	ldh [Video + 1], a
 	xor a
 	ldh [Video], a
@@ -136,9 +137,9 @@ StartRender:
 	ld [Rendered + 1], a
 
 	; start rendering
-	ld a, 20
+	ld a, TILE_WIDTH
 	ldh [TilesLeft], a
-	ld a, 18
+	ld a, TILE_HEIGHT
 	ldh [LinesLeft], a
 	
 	; enable v-blank and lcd stat interrupt for h-blank