From 872d2c2766536a372af5d1048bed7514078f9d31 Mon Sep 17 00:00:00 2001
From: Oxore <oxore@protonmail.com>
Date: Mon, 3 Oct 2022 00:31:53 +0300
Subject: Impl vblank irq

---
 vdp.hpp | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'vdp.hpp')

diff --git a/vdp.hpp b/vdp.hpp
index cd93938..9357377 100644
--- a/vdp.hpp
+++ b/vdp.hpp
@@ -13,6 +13,7 @@ class VDP {
         VDP(const uint32_t base_address_a = VDP_START): base_address(base_address_a) {}
         uint32_t Read(uint32_t offset, enum bitness);
         void Write(uint32_t offset, enum bitness, uint32_t value);
+        bool Scanline(); // Returns true if display disabled or vblank happened
         void Reset();
 
         const uint32_t base_address;
@@ -76,9 +77,12 @@ class VDP {
         static constexpr size_t kVRAMSize = 64*1024;
         static constexpr size_t kCRAMSize = 64*2;
         static constexpr size_t kVSRAMSize = 40*2;
+        static constexpr uint16_t kLinesPerScreenNTSC = 262;
+        static constexpr uint16_t kLinesPerScreenPAL = 312;
 
         StatusRegister _status{};
         bool _control_write_second_word{};
+        uint16_t _lines_counter{};
         uint8_t _address_mode{};
         uint16_t _address{};
         uint8_t _reg[kRegistersCount]{};
-- 
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