diff options
| -rw-r--r-- | src/vectors.s | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/src/vectors.s b/src/vectors.s index 8928aaf..75de30a 100644 --- a/src/vectors.s +++ b/src/vectors.s @@ -3,6 +3,12 @@ .segment "CODE" +;; Debug utilities. +.scope Debug + ;; Counter for frame drops. + zp_frame_drops = $90 +.endscope + ;; Pretty standard reset function, nothing crazy. .proc reset ;; Disable interrupts and decimal mode. @@ -29,6 +35,12 @@ bit PPU::STATUS bpl @vblankwait1 + ;; Initialize the counter for frame drops before any NMIs can come in. + .ifdef PARTIAL + lda #0 + sta Debug::zp_frame_drops + .endif + ;; Reset all sprites by simply moving the Y coordinate out of screen. lda #$EF ldx #0 @@ -60,7 +72,13 @@ .proc nmi ;; Should we skip it? bit Globals::zp_flags - bpl @end + + ;; If we are on a dev environment, account for any frame drops. + .ifdef PARTIAL + bpl @account_for_frame_drop + .else + bpl @end + .endif ;; Save registers. pha @@ -131,6 +149,9 @@ @end: rti +@account_for_frame_drop: + inc Debug::zp_frame_drops + rti .endproc ;; Unused. |