chore(*): vblank count passed now in crt0 and 32 bits

alekmaul · Mar 28, 2024 · 2fe3893 · 2fe3893
1 parent adc3168
commit 2fe3893
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Showing 3 changed files with 18 additions and 10 deletions.
diff --git a/pvsneslib/include/snes/console.h b/pvsneslib/include/snes/console.h
@@ -45,7 +45,7 @@
 extern u8 scr_txt_font_map[0x800]; /*!< \brief tilemap used for text display */
 extern u8 scr_txt_dirty;           /*!< \brief flag to redraw text during vblank */
 
-extern u16 snes_vblank_count; /*!< \brief Number of VBL since consoleInit called */
+extern u32 snes_vblank_count; /*!< \brief Number of VBL since consoleInit called */
 extern u8 snes_50hz;          /*!< \brief 1 if on a PAL/50Hz SNES */
 extern u8 snes_fps;           /*!< \brief 50 if PAL console (50 Hz) or 60 if NTSC console (60Hz) */
 

diff --git a/pvsneslib/source/consoles.asm b/pvsneslib/source/consoles.asm
@@ -41,8 +41,6 @@
 .BASE $00
 .RAMSECTION ".reg_cons7e" BANK $7E SLOT RAMSLOT_0
 
-snes_vblank_count       DW                                  ; to count number of vblank
-
 snes_50hz               DB                                  ; 1 if PAL console (50 Hz) instead of NTSC (60Hz)
 snes_fps                DB                                  ; 50 if PAL console (50 Hz) or 60 if NTSC console (60Hz)
 
@@ -418,11 +416,7 @@ cvbloam:
 
     stz scr_txt_dirty                                         ; no more transfer of text
 
-    ; Count frame number
-+   rep #$20
-    inc.w snes_vblank_count
-
-    plb
++:  plb
     plp
     rtl
 

diff --git a/pvsneslib/source/crt0_snes.asm b/pvsneslib/source/crt0_snes.asm
@@ -26,9 +26,12 @@ tcc__f3h dsb 2
 move_insn dsb 4	                        ; 3 bytes mvn + 1 byte rts
 move_backwards_insn dsb 4               ; 3 bytes mvp + 1 byte rts
 nmi_handler dsb 4
-
+ 
 tcc__registers_irq dsb 0
 tcc__regs_irq dsb 48
+
+snes_vblank_count       dsb 4           ; 4 bytes to count number of vblank
+
 .ENDS
 
 ; sections "globram.data" and "glob.data" can stay here in the file
@@ -231,7 +234,15 @@ FVBlank:
   pea $7e7e
   plb
   plb
-  lda.w #tcc__registers_irq
+  rep #$20
+
+  ; Count frame number
+  lda.w #$1
+  inc.w snes_vblank_count
+  bne +
+  inc.w snes_vblank_count+2
+
++:  lda.w #tcc__registers_irq
   tad
   lda.l nmi_handler
   sta.b tcc__r10
@@ -327,6 +338,9 @@ fast_start:
     stz.b tcc__r0
     stz.b tcc__r1
 
+    stz.w snes_vblank_count
+    stz.w snes_vblank_count+2
+
     jsr.l main
 
     ; write exit code to $fffd