100 lines
3.9 KiB
C#
100 lines
3.9 KiB
C#
using System;
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using System.Drawing;
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using System.Drawing.Imaging;
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using System.Runtime.InteropServices;
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using System.Windows.Forms;
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using Core.Video;
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namespace Desktop
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{
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public class VramViewerForm : Form
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{
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private readonly SmsVdp _vdp;
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private readonly System.Windows.Forms.Timer _refreshTimer;
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private readonly Bitmap _vramBitmap;
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private readonly int[] _pixelData;
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public VramViewerForm(SmsVdp vdp)
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{
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_vdp = vdp;
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this.Text = "VRAM Viewer (512 Tiles)";
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// 256x128 native resolution, scaled up by 2 for visibility!
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this.ClientSize = new Size(512, 256);
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this.DoubleBuffered = true;
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this.FormBorderStyle = FormBorderStyle.FixedToolWindow;
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_vramBitmap = new Bitmap(256, 128, PixelFormat.Format32bppArgb);
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_pixelData = new int[256 * 128];
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// Update the window 10 times a second so it doesn't drain CPU power
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_refreshTimer = new System.Windows.Forms.Timer();
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_refreshTimer.Interval = 100;
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_refreshTimer.Tick += (s, e) => UpdateVramImage();
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_refreshTimer.Start();
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}
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private void UpdateVramImage()
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{
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if (_vdp == null) return;
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// Loop through all 512 tiles in VRAM
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for (int tile = 0; tile < 512; tile++)
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{
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// Calculate grid position (32 columns, 16 rows)
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int tileX = (tile % 32) * 8;
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int tileY = (tile / 32) * 8;
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int tileAddress = tile * 32;
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// Decode the 8x8 pixels
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for (int y = 0; y < 8; y++)
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{
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byte bp0 = _vdp.VRAM[tileAddress + (y * 4) + 0];
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byte bp1 = _vdp.VRAM[tileAddress + (y * 4) + 1];
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byte bp2 = _vdp.VRAM[tileAddress + (y * 4) + 2];
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byte bp3 = _vdp.VRAM[tileAddress + (y * 4) + 3];
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for (int x = 0; x < 8; x++)
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{
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int shift = 7 - x;
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int colorIndex = ((bp0 >> shift) & 1) | (((bp1 >> shift) & 1) << 1) |
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(((bp2 >> shift) & 1) << 2) | (((bp3 >> shift) & 1) << 3);
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// Use the Sprite Palette (Offset 16) so characters and enemies are colored correctly
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byte smsColor = _vdp.CRAM[16 + colorIndex];
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int r = (smsColor & 0x03) * 85;
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int g = ((smsColor >> 2) & 0x03) * 85;
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int b = ((smsColor >> 4) & 0x03) * 85;
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// Background color (Index 0) is technically transparent for sprites, so we render it as magenta
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if (colorIndex == 0) { r = 255; g = 0; b = 255; }
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_pixelData[((tileY + y) * 256) + (tileX + x)] = (255 << 24) | (r << 16) | (g << 8) | b;
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}
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}
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}
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// Blast the array into the Bitmap
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var data = _vramBitmap.LockBits(new Rectangle(0, 0, 256, 128), ImageLockMode.WriteOnly, PixelFormat.Format32bppArgb);
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Marshal.Copy(_pixelData, 0, data.Scan0, _pixelData.Length);
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_vramBitmap.UnlockBits(data);
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this.Invalidate();
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}
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protected override void OnPaint(PaintEventArgs e)
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{
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base.OnPaint(e);
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// Draw it chunky and pixel-perfect
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e.Graphics.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.NearestNeighbor;
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e.Graphics.PixelOffsetMode = System.Drawing.Drawing2D.PixelOffsetMode.Half;
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e.Graphics.DrawImage(_vramBitmap, new Rectangle(0, 0, this.ClientSize.Width, this.ClientSize.Height));
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}
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protected override void OnFormClosing(FormClosingEventArgs e)
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{
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_refreshTimer.Stop();
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base.OnFormClosing(e);
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}
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}
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} |