[update] add save && read game state function

Author: tiansongyu

6502/6502Emulator/src/olcNes_PPU_Backgrounds.cpp

@@ -253,6 +253,24 @@ class Demo_olcNES : public olc::PixelGameEngine
         if (GetKey(olc::Key::P).bPressed)
             (++nSelectedPalette) &= 0x07;
 
+        // 存储游戏状态
+        if (GetKey(olc::Key::F1).bPressed)
+        {
+            std::ofstream ofs;
+            ofs.open("./save_0.dat", std::ofstream::binary);
+            ofs.write(reinterpret_cast<char *>(&nes), sizeof(nes));
+            ofs.close();
+        }
+
+        // 还原游戏状态
+        if (GetKey(olc::Key::F2).bPressed)
+        {
+            std::ifstream ifs;
+            ifs.open("./save_0.dat", std::ofstream::binary);
+            ifs.read(reinterpret_cast<char *>(&nes), sizeof(nes));
+            ifs.close();
+        }
+
         DrawCpu(516, 2);
         // DrawCode(516, 72, 26);
 
@@ -369,6 +387,14 @@ class Demo_olcNES : public olc::PixelGameEngine
                 // Reset frame completion flag
                 nes.ppu.frame_complete = false;
             }
+            // 存储游戏状态
+            if (GetKey(olc::Key::Z).bPressed)
+            {
+                std::ofstream ofs;
+                ofs.open("./save_0.dat", std::ofstream::binary);
+                ofs.write(reinterpret_cast<char *>(&nes), sizeof(nes));
+                ofs.close();
+            }
         }
 
         DrawCpu(516, 2);

6502/6502Lib/src/public/Cartridge.cpp

@@ -48,7 +48,6 @@ Cartridge::Cartridge(const std::string &sFileName)
     {
         // 读iNES文件头
         ifs.read(reinterpret_cast<char *>(&header), sizeof(sHeader));
-
         // 如果有mapper1，则调到512字节开始读取文件内容
         if (header.mapper1 & 0x04)
             ifs.seekg(512, std::ios_base::cur);

readme.md

@@ -15,6 +15,15 @@
 | B                     | J           |
 | Reset                 | R           |
 
+### 功能键
+
+| function        | key       |
+|-----------------|-----------|
+| save game state | F1        |
+| load game state | F2        |
+| reset game      | Backspace |
+| change palette  | P         |
+
 ## 实现的模块
 - BUS
 - Cartridge(卡带)