parsons/ParsonsMasterSystem2026
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Updated VDP to handle GameGear. Added Turbo mode. Versio 1.0 me thinks!

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Marc Parsons
2026-05-18 14:57:19 +01:00
parent be43019fb0
commit 66f18d0510
5 changed files with 213 additions and 113 deletions
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143
Desktop/Form1.cs
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@@ -18,14 +18,14 @@ namespace Desktop
private Bitmap _screenBitmap = new Bitmap(256, 192, PixelFormat.Format32bppArgb);
private NAudioPlayer _audioPlayer;
private Task _emulatorTask;
private double TargetFrameTime = 16.667f; //NTSC
//private double TargetFrameTime = 20; //PAL
public int TotalFrameCount = 0;
public double FrameTime { get; private set; } = 0;
public double FramesPerSecond { get; private set; } = 0;
private string _currentRomName = "No ROM";
private string _currentRomPath = "";
private Stopwatch _stopwatch = new System.Diagnostics.Stopwatch();
private Stopwatch _stopwatch = new Stopwatch();
private string _romType = "";
private bool isTurboMode = false;
public bool IsRunning { get; private set; } = false;
public ushort? Breakpoint
@@ -37,21 +37,17 @@ namespace Desktop
public ParsonsForm1()
{
InitializeComponent();
// These are perfectly safe for the Visual Studio Designer!
this.KeyPreview = true;
this.KeyDown += Form1_KeyDown;
this.KeyUp += Form1_KeyUp;
this.DoubleBuffered = true;
this.ResizeRedraw = true;
}
// The Designer ignores this completely, but the compiled game runs it instantly!
protected override void OnLoad(EventArgs e)
{
base.OnLoad(e);
this.Text = $"Parsons Master System - {_currentRomName}";
this.Text = $"Parsons Master System 2026 - {_currentRomName}";
this.BackColor = Color.Black;
_machine = new SmsMachine();
@@ -70,6 +66,7 @@ namespace Desktop
this.Invalidate();
TotalFrameCount++;
}
protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
@@ -80,44 +77,90 @@ namespace Desktop
e.Graphics.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.NearestNeighbor;
e.Graphics.PixelOffsetMode = System.Drawing.Drawing2D.PixelOffsetMode.Half;
// 2. Calculate the actual usable window space
int topOffset = menuStrip1.Height;
int availableWidth = this.ClientSize.Width;
int availableHeight = this.ClientSize.Height - topOffset;
// 3. Calculate the maximum scale factor that fits perfectly
float scaleX = (float)availableWidth / 256f;
float scaleY = (float)availableHeight / 192f;
// 2. THE LENS LENS: Determine what part of the VDP buffer we actually want to show!
// (Safely check if the machine/video processor exists yet)
bool isGG = _machine?.VideoProcessor?.IsGameGear ?? false;
int sourceWidth = isGG ? 160 : 256;
int sourceHeight = isGG ? 144 : 192;
int sourceX = isGG ? 48 : 0; // Skip 48 pixels in!
int sourceY = isGG ? 24 : 0; // Skip 24 pixels down!
// Create a rectangle defining the specific pixels to extract from the raw frame buffer
Rectangle sourceRect = new Rectangle(sourceX, sourceY, sourceWidth, sourceHeight);
// 3. Calculate the maximum scale factor for the cropped image
float scaleX = (float)availableWidth / sourceWidth;
float scaleY = (float)availableHeight / sourceHeight;
// Pick the smaller scale so the image never bleeds off the edge
float scale = Math.Min(scaleX, scaleY);
// 4. Calculate the new physical pixel dimensions
int newWidth = (int)(256 * scale);
int newHeight = (int)(192 * scale);
int newWidth = (int)(sourceWidth * scale);
int newHeight = (int)(sourceHeight * scale);
// 5. Center the image (Letterboxing / Pillarboxing)
int offsetX = (availableWidth - newWidth) / 2;
int offsetY = topOffset + ((availableHeight - newHeight) / 2);
Rectangle renderArea = new Rectangle(offsetX, offsetY, newWidth, newHeight);
// Create a rectangle defining exactly where on the Windows form to draw the extracted pixels
Rectangle destRect = new Rectangle(offsetX, offsetY, newWidth, newHeight);
// 6. Draw the scaled image
e.Graphics.DrawImage(_screenBitmap, renderArea);
// 6. Blast the perfectly cropped and scaled bitmap onto the screen!
e.Graphics.DrawImage(_screenBitmap, destRect, sourceRect, GraphicsUnit.Pixel);
}
}
//protected override void OnPaint(PaintEventArgs e)
//{
// base.OnPaint(e);
// if (_screenBitmap != null && menuStrip1 != null)
// {
// // 1. Maintain perfect, chunky retro pixels
// e.Graphics.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.NearestNeighbor;
// e.Graphics.PixelOffsetMode = System.Drawing.Drawing2D.PixelOffsetMode.Half;
// // 2. Calculate the actual usable window space
// int topOffset = menuStrip1.Height;
// int availableWidth = this.ClientSize.Width;
// int availableHeight = this.ClientSize.Height - topOffset;
// // 3. Calculate the maximum scale factor that fits perfectly
// float scaleX = (float)availableWidth / 256f;
// float scaleY = (float)availableHeight / 192f;
// // Pick the smaller scale so the image never bleeds off the edge
// float scale = Math.Min(scaleX, scaleY);
// // 4. Calculate the new physical pixel dimensions
// int newWidth = (int)(256 * scale);
// int newHeight = (int)(192 * scale);
// // 5. Center the image (Letterboxing / Pillarboxing)
// int offsetX = (availableWidth - newWidth) / 2;
// int offsetY = topOffset + ((availableHeight - newHeight) / 2);
// Rectangle renderArea = new Rectangle(offsetX, offsetY, newWidth, newHeight);
// // 6. Draw the scaled image
// e.Graphics.DrawImage(_screenBitmap, renderArea);
// }
//}
public void StartEmulator()
{
if (IsRunning) return;
IsRunning = true;
TotalFrameCount = 0;
double targetFps = _machine.VideoProcessor.IsPalRegion ? 50.0 : 59.92274;
double TargetFrameTime = 1000.0 / targetFps;
_emulatorTask = Task.Run(() =>
{
double targetFps = 59.94;
double TargetFrameTime = 1000.0 / targetFps;
_stopwatch.Restart();
double nextFrameTargetTime = _stopwatch.Elapsed.TotalMilliseconds + TargetFrameTime;
@@ -126,7 +169,13 @@ namespace Desktop
while (IsRunning)
{
// Mark exactly when the emulator starts thinking
//targetFps = isTurboMode ? 1000 : 59.94;
//TargetFrameTime = 1000.0 / targetFps;
BeginInvoke((System.Windows.Forms.MethodInvoker)delegate
{
targetFps = isTurboMode ? 1000 : 59.94;
TargetFrameTime = 1000.0 / targetFps;
});
double frameStartTime = _stopwatch.Elapsed.TotalMilliseconds;
// --- POLL PHYSICAL CONTROLLER ---
@@ -187,7 +236,7 @@ namespace Desktop
BeginInvoke((System.Windows.Forms.MethodInvoker)delegate
{
this.Text = $"Parsons Master System 2026 - {_currentRomName} [FPS/FT: {FramesPerSecond:F0}/{FrameTime:F1}]";
this.Text = $"{_romType} Parsons Master System 2026 - {_currentRomName} [FPS: {FramesPerSecond:F0}]";
});
}
@@ -212,6 +261,18 @@ namespace Desktop
{
await _emulatorTask;
}
_romType = Path.GetExtension(filePath);
if (_romType == ".sms")
{
_machine.VideoProcessor.IsGameGear = false;
}
else if (_romType == ".gg")
{
_machine.VideoProcessor.IsGameGear = true;
}
else
throw new Exception("Incorrect ROM Type!");
_romType = _machine.VideoProcessor.IsGameGear ? "GG" : "SMS";
// 1. SAVE THE PREVIOUS GAME!
SaveCurrentSram();
@@ -225,7 +286,7 @@ namespace Desktop
// 4. Update the path tracking
_currentRomPath = filePath;
_currentRomName = Path.GetFileNameWithoutExtension(filePath);
this.Text = $"Parsons Master System - {_currentRomName}";
//this.Text = $"{_romType} Parsons Master System 2026 - {_currentRomName}";
// 5. LOAD THE NEW SAVE DATA FROM THE EXE FOLDER!
string savPath = GetSaveFilePath();
@@ -263,13 +324,11 @@ namespace Desktop
private void PopulateIncludedRomsMenu()
{
// The folder you used for Golden Axe Warrior
string romsDirectory = @"C:\Parsons\Local Code Projects\ParsonsMasterSystem2026\Desktop\ROMS\";
if (Directory.Exists(romsDirectory))
{
string[] romFiles = Directory.GetFiles(romsDirectory, "*.sms");
foreach (string file in romFiles)
{
// Create a new dropdown item for each .sms file it finds
@@ -280,8 +339,20 @@ namespace Desktop
romMenuItem.Click += (sender, e) => LoadRomAndStart(file);
// Add it to the "Included" submenu (make sure the name matches your designer element!)
includedToolStripMenuItem.DropDownItems.Add(romMenuItem);
masterSystemToolStripMenuItem.DropDownItems.Add(romMenuItem);
}
romFiles = Directory.GetFiles(romsDirectory, "*.gg");
foreach (string file in romFiles)
{
// Create a new dropdown item for each .gg file it finds
string romName = Path.GetFileNameWithoutExtension(file);
ToolStripMenuItem romMenuItem = new ToolStripMenuItem(romName);
// When clicked, pass the file path to the helper method
romMenuItem.Click += (sender, e) => LoadRomAndStart(file);
gameGearToolStripMenuItem.DropDownItems.Add(romMenuItem);
}
}
}
@@ -290,7 +361,7 @@ namespace Desktop
using (OpenFileDialog ofd = new OpenFileDialog())
{
ofd.Title = "Select Master System ROM";
ofd.Filter = "SMS ROMs (*.sms)|*.sms|All Files (*.*)|*.*";
ofd.Filter = "SMS ROMs (*.sms)|*.sms|GG ROMs (*.gg)|*.gg|All Files (*.*)|*.*";
if (ofd.ShowDialog() == DialogResult.OK)
{
@@ -324,11 +395,7 @@ namespace Desktop
_vramViewer.Show();
}
private void includedToolStripMenuItem_Click(object sender, EventArgs e)
{
}
private void exitToolStripMenuItem_Click(object sender, EventArgs e)
{
this.Close();
@@ -412,14 +479,10 @@ namespace Desktop
StartEmulator();
}
private void pALRegionToolStripMenuItem_Click(object sender, EventArgs e)
private void turboModeToolStripMenuItem_Click(object sender, EventArgs e)
{
if (pALRegionToolStripMenuItem.Checked)
_machine.VideoProcessor.IsPalRegion = true;
else _machine.VideoProcessor.IsPalRegion= false;
pALRegionToolStripMenuItem.Checked = !pALRegionToolStripMenuItem.Checked;
turboModeToolStripMenuItem.Checked = !turboModeToolStripMenuItem.Checked;
isTurboMode = turboModeToolStripMenuItem.Checked ? true : false;
}
}
}