diff options
Diffstat (limited to 'space/src/states/game.s')
| -rw-r--r-- | space/src/states/game.s | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/space/src/states/game.s b/space/src/states/game.s new file mode 100644 index 0000000..ca8a49b --- /dev/null +++ b/space/src/states/game.s @@ -0,0 +1,21 @@ +.scope Game + ;; Contains relevant flags for the execution of the game: + ;; - 7: set to 1 whenever the game logic is over and we can start + ;; rendering; set to 0 when rendering is done. + ;; - 6-0: unused. + flags = $20 +.endscope + +;; SET_RENDER_FLAG sets the render bit on Game::flags to 1. +.macro SET_RENDER_FLAG + lda #%10000000 + ora Game::flags + sta Game::flags +.endmacro + +;; UNSET_RENDER_FLAG sets the render bit on Game::flags to 0. +.macro UNSET_RENDER_FLAG + lda #%01111111 + and Game::flags + sta Game::flags +.endmacro |