diff options
Diffstat (limited to 'include/globals.s')
| -rw-r--r-- | include/globals.s | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/include/globals.s b/include/globals.s new file mode 100644 index 0000000..41d3e6c --- /dev/null +++ b/include/globals.s @@ -0,0 +1,39 @@ +.scope Globals + ;;; + ;; Temporary values. + + m_tmp_1 = $00 + m_tmp_2 = $01 + m_tmp_3 = $02 + m_tmp_4 = $03 + m_tmp_5 = $04 + + ;; Bit map to be used as flags during execution. + m_flags = $20 + + ;; Initialize global variables. + .proc init + lda #0 + sta m_tmp_1 + sta m_tmp_2 + sta m_tmp_3 + sta m_tmp_4 + sta m_tmp_5 + sta m_flags + rts + .endproc +.endscope + +;; SET_RENDER_FLAG sets the render bit on Globals::m_flags to 1. +.macro SET_RENDER_FLAG + lda #%10000000 + ora Globals::m_flags + sta Globals::m_flags +.endmacro + +;; UNSET_RENDER_FLAG sets the render bit on Globals::m_flags to 0. +.macro UNSET_RENDER_FLAG + lda #%01111111 + and Globals::m_flags + sta Globals::m_flags +.endmacro |