From c57db9433f638d00e86860c3bc718a254e46d977 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jo=C3=A3o=20Magalh=C3=A3es?= <joamag@gmail.com>
Date: Thu, 30 Jun 2022 13:37:46 +0100
Subject: [PATCH] feat: support for the hblank and vblank
---
src/ppu.rs | 33 +++++++++++++++++++++++++++++++--
1 file changed, 31 insertions(+), 2 deletions(-)
diff --git a/src/ppu.rs b/src/ppu.rs
index e8292591..48ede09f 100644
--- a/src/ppu.rs
+++ b/src/ppu.rs
@@ -92,8 +92,37 @@ impl Ppu {
self.mode = PpuMode::Hblank;
}
}
- PpuMode::Hblank => todo!(),
- PpuMode::VBlank => todo!(),
+ PpuMode::Hblank => {
+ if self.mode_clock >= 204 {
+ self.line += 1;
+
+ // in case we've reached the end of the
+ // screen we're now entering the v-blank
+ if self.line == 143 {
+ self.mode = PpuMode::VBlank;
+ // self.drawData @todo implement this one
+ } else {
+ self.mode = PpuMode::OamRead;
+ }
+
+ self.mode_clock = 0;
+ }
+ }
+ PpuMode::VBlank => {
+ if self.mode_clock >= 456 {
+ self.line += 1;
+
+ // in case the end of v-blank has been reached then
+ // we must jump again to the OAM read mode and reset
+ // the scan line counter to the zero value
+ if self.line == 153 {
+ self.mode = PpuMode::OamRead;
+ self.line = 0;
+ }
+
+ self.mode_clock = 0;
+ }
+ }
}
}
--
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