Reset X- and Y-offsets when enabling SVGA video mode

Reset members svga_offset, svga_offset_x and svga_offset_y to 0 when enabling any SVGA video mode. Behaviour copied from Bochs at: https://sourceforge.net/p/bochs/code/HEAD/tree/trunk/bochs/iodev/display/vga.cc#l1068
copy · Sep 8, 2024 · 283bda1 · 283bda1
1 parent e3b43c1
commit 283bda1
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/src/vga.js b/src/vga.js
@@ -2163,6 +2163,9 @@ VGAScreen.prototype.port1CF_write = function(value)
 
     if(this.svga_enabled && this.dispi_index === 4)
     {
+        this.svga_offset = 0;
+        this.svga_offset_x = 0;
+        this.svga_offset_y = 0;
         this.set_size_graphical(this.svga_width, this.svga_height, this.svga_bpp, this.svga_width, this.svga_height);
         this.bus.send("screen-set-mode", true);
         this.graphical_mode = true;