Fixed push/pull framework. Works on page1

HiSprite.py

@@ -412,11 +412,15 @@ class Sprite(Listing):
         return cycleCount, optimizationCount
 
     def rowStartCalculatorCode(self, row, baselabel):
+        if self.double_buffer:
+            first = self.height - 1
+        else:
+            first = 0
         self.out()
         self.comment_line("row %d" % row)
         if self.double_buffer:
-            if row == self.height - 1:
-                label = "%s_pageloop" % (baselabel)
+            if row == first:
+                label = "%s_PAGELOOP" % (baselabel)
                 self.asm("ldx PARAM1")
                 self.asm("ldy #%d" % self.height)
                 self.label(label)
@@ -425,11 +429,10 @@ class Sprite(Listing):
                 self.asm("inx")
                 self.asm("dey")
                 self.asm("bne %s" % label)
-                self.asm("dex")
+                self.asm("ldx PARAM1")
                 self.asm("pla")
                 cycles = 3
             else:
-                self.asm("dex")
                 self.asm("pla")
                 cycles = 4
         else:
@@ -443,7 +446,7 @@ class Sprite(Listing):
         self.asm("sta SCRATCH1")
         self.asm("lda HGRROWS_L+%d,x" % row)
         self.asm("sta SCRATCH0")
-        if row == 0:
+        if row == first:
             self.asm("ldy PARAM0")
             self.asm("lda DIV%d_%d,y" % (self.screen.numShifts, self.screen.bitsPerPixel))
             self.asm("sta PARAM2")  # save the mod lookup; it doesn't change

multitest.s

@@ -22,8 +22,7 @@ SCRATCH1        = $1a
 SPRITEPTR_L     = $1b
 SPRITEPTR_H     = $1c
 RENDERCOUNT     = $ce
-FRAMECOUNT      = $cf  ; used to determine page currently displayed: even -> page1, odd -> page2
-VISIBLEPAGE     = $d7
+DRAWPAGE        = $d7      ; pos = page1, neg = page2
 BGSTORE = $fa
 TEMPADDR        = $fc
 
@@ -63,7 +62,7 @@ fasttoggle
 
 initonce
     lda #0
-    sta FRAMECOUNT
+    sta DRAWPAGE
     rts
 
 
@@ -72,11 +71,10 @@ initsprites
     rts
 
 pageflip
-    inc FRAMECOUNT
-    lda FRAMECOUNT
-    and #1
-    sta VISIBLEPAGE
-    beq pageflip1
+    lda DRAWPAGE
+    eor #$80
+    sta DRAWPAGE
+    bpl pageflip1
     bit TXTPAGE2
     rts
 pageflip1