...

2 files changed, 10 insertions, 8 deletions

diff --git a/src/main.rs b/src/main.rs
index c53068b..ca6219f 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -228,9 +228,6 @@ fn main() {
         cpu.step();
         //println!("cpu at 0x{:04x}", cpu.get_pc());
         while cpu.cycle > 0 {
-            if ppu.tick() || ppu.tick() || ppu.tick() {
-                cpu.trigger_nmi();
-            }
             cnt += 1;
             if cnt >= CYC_PER_FRAME {
                 win.render();
@@ -239,13 +236,17 @@ fn main() {
                 if duration_per_frame > e {
                     let diff = duration_per_frame - e;
                     sleep(diff);
-                    //println!("{} faster", diff.subsec_nanos() as f64 / 1e6);
+                    println!("{} faster", diff.subsec_nanos() as f64 / 1e6);
                 } else {
-                    //println!("{} slower", (e - duration_per_frame).subsec_nanos() as f64 / 1e6);
+                    println!("{} slower", (e - duration_per_frame).subsec_nanos() as f64 / 1e6);
                 }
                 timer = Instant::now();
                 cnt -= CYC_PER_FRAME;
             }
+
+            if ppu.tick() || ppu.tick() || ppu.tick() {
+                cpu.trigger_nmi();
+            }
             cpu.cycle -= 1;
         }
     }
diff --git a/src/ppu.rs b/src/ppu.rs
index 464a25d..adc9d2d 100644
--- a/src/ppu.rs
+++ b/src/ppu.rs
@@ -89,7 +89,6 @@ impl<'a> PPU<'a> {
     #[inline]
     pub fn write_oamdata(&mut self, data: u8) {
         self.reg = data;
-        if self.rendering { return }
         unsafe {
             let oam_raw = transmute::<&mut[Sprite; 64], &mut[u8; 256]>(&mut self.oam);
             oam_raw[self.oamaddr as usize] = data;
@@ -109,6 +108,9 @@ impl<'a> PPU<'a> {
     pub fn write_scroll(&mut self, data: u8) {
         self.reg = data;
         let data = data as u16;
+        if !(!(self.get_show_bg() || self.get_show_sp()) || self.get_flag_vblank()) {
+            println!("writing to scroll {} {}", self.scanline, self.cycle);
+        }
         match self.w {
             false => {
                 self.t = (self.t & 0x7fe0) | (data >> 3);
@@ -491,8 +493,7 @@ impl<'a> PPU<'a> {
         }
         let visible_line = self.scanline < 240;
         let pre_line = self.scanline == 261;
-        self.rendering = pre_line || visible_line;
-        if self.rendering && (self.get_show_bg() || self.get_show_sp()) {
+        if (pre_line || visible_line) && (self.get_show_bg() || self.get_show_sp()) {
             if pre_line && 279 < cycle && cycle < 305 {
                 self.reset_y();
             } else {