diff --git a/ppu/ppu.c b/ppu/ppu.c
index ab51564..040be59 100644
--- a/ppu/ppu.c
+++ b/ppu/ppu.c
@@ -19,7 +19,31 @@ void ppu_init(PPU *ppu, byte *registers_ram, byte *oam_dma_register) {
     ppu->odd_frame = false;
 }
 
+long frame = 0;
+int x, y = 0;
+
 void ppu_cycle(PPU *ppu) {
+    int frame_width = 341;
+    int frame_height = 262;
+    bool rendering_enabled = ppu_read_flag(ppu, PPU_REGISTER_MASK, PPU_MASK_SHOW_BG | PPU_MASK_SHOW_SP);
+    if (rendering_enabled && ppu->odd_frame) {
+        // With rendering enabled, the odd frames are shorter
+        // TODO: and doing the last cycle of the last dummy nametable fetch there instead
+        frame_width = 339;
+        frame_height = 261;
+    }
+
+    x++;
+    if (x >= frame_width) {
+        x = 0;
+        y++;
+    }
+
+    if (y >= frame_height) {
+        y = 0;
+        frame++;
+        ppu->odd_frame = !ppu->odd_frame;
+    }
 }
 
 bool ppu_read_flag(PPU *ppu, size_t reg, byte mask) {