From fe156a97d5373cd9a7b093ab1c40bda403ad93fb Mon Sep 17 00:00:00 2001
From: Jesse Luehrs <doy@tozt.net>
Date: Wed, 8 Oct 2014 15:50:33 -0400
Subject: draw the game screen

---
 main.s      |  78 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++---
 sprites.chr | Bin 8192 -> 8192 bytes
 2 files changed, 75 insertions(+), 3 deletions(-)

diff --git a/main.s b/main.s
index 55da8a9..33c73b2 100644
--- a/main.s
+++ b/main.s
@@ -31,7 +31,12 @@ frame_count     DB
 ; }}}
 ; other configuration {{{
 .asciitable
-; just use ascii for now
+MAP "-" = 1
+MAP "|" = 2
+MAP ":" = 3
+MAP "." = 4
+MAP "," = 5
+MAP "'" = 6
 .enda
 ; }}}
 ; prg {{{
@@ -252,9 +257,9 @@ check_collisions
   BCS collision
 
   LDA head_y
-  CMP #$18
+  CMP #$20
   BCC collision
-  CMP #$E8
+  CMP #$E0
   BCS collision
 
   JMP end_game_loop
@@ -288,6 +293,64 @@ read_controller1_values:
 end_read_controller1:
   RTS ; }}}
 start_game: ; {{{
+  LDA #$02
+  STA game_state
+
+- BIT $2002
+  BPL -
+
+  LDA #%00000000
+  STA $2001 ; disable rendering (since this will take longer than vblank)
+
+  LDA #$20
+  STA $2006
+  LDA #$00
+  STA $2006
+
+  LDA #$20
+  LDY #$03
+-- LDX #$00
+- STA $2007
+  INX
+  CPX #$20
+  BNE -
+  DEY
+  BNE --
+
+  LDX #$00
+- LDA game_background_top.w, x
+  STA $2007
+  INX
+  CPX #$20
+  BNE -
+
+  LDY #$18
+-- LDX #$00
+- LDA game_background_middle.w, x
+  STA $2007
+  INX
+  CPX #$20
+  BNE -
+  DEY
+  BNE --
+
+  LDX #$00
+- LDA game_background_bottom.w, x
+  STA $2007
+  INX
+  CPX #$20
+  BNE -
+
+  LDA #$20
+  LDX #$00
+- STA $2007
+  INX
+  CPX #$20
+  BNE -
+
+  LDA #%00011000
+  STA $2001 ; reenable rendering
+
   LDA #$01
   STA game_state
   RTS ; }}}
@@ -348,6 +411,15 @@ palette: ; {{{
 intro_screen: ; {{{
   .asc "           SNAKE                "
 ; }}}
+game_background_top: ; {{{
+  .asc "  ,--------------------------.  "
+; }}}
+game_background_middle: ; {{{
+  .asc "  |                          |  "
+; }}}
+game_background_bottom: ; {{{
+  .asc "  '--------------------------:  "
+; }}}
 ; }}}
   .orga $FFFA    ;first of the three vectors starts here
 ; interrupt vectors {{{
diff --git a/sprites.chr b/sprites.chr
index ef0a654..894b4b5 100644
Binary files a/sprites.chr and b/sprites.chr differ
-- 
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