Merge pull request #53 from zohassadar/faster_oam_reset

Faster oam reset

Author: kirjavascript

src/gamemodestate/pause.asm

@@ -38,10 +38,7 @@ pause:
 
 @pauseSetupPart2:
         jsr updateAudioAndWaitForNmi
-        lda #$FF
-        ldx #$02
-        ldy #$02
-        jsr memset_page
+        jsr resetOAMStaging
 
 @pauseLoop:
         lda qualFlag

src/util/core.asm

@@ -59,10 +59,21 @@ updateAudioWaitForNmiAndResetOamStaging:
 @checkForNmi:
         lda verticalBlankingInterval
         beq @checkForNmi
+
+resetOAMStaging:
+; Hide a sprite by moving it down offscreen, by writing any values between #$EF-#$FF here. 
+; Sprites are never displayed on the first line of the picture, and it is impossible to place 
+; a sprite partially off the top of the screen. 
+; https://www.nesdev.org/wiki/PPU_OAM
+        ldx #$00
         lda #$FF
-        ldx #$02
-        ldy #$02
-        jsr memset_page
+@hideY:
+        sta oamStaging,x
+        inx
+        inx
+        inx
+        inx
+        bne @hideY
         rts
 
 updateAudioAndWaitForNmi: