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Re-write of GetFullScreenCanvas

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This commit is contained in:
Arawn Davies 2018-02-24 22:10:18 +00:00
parent beb48f29fd
commit efa36d1600
1 changed files with 60 additions and 40 deletions
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100
source/Cosmos.System2/Graphics/FullScreenCanvas.cs
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@ -12,55 +12,75 @@ namespace Cosmos.System.Graphics
//VGADriver,
VBEDriver
}
private static PCIDevice SVGAIIDevice = PCI.GetDevice(VendorID.VMWare, DeviceID.SVGAIIAdapter);
private static bool SVGAIIExists = SVGAIIDevice.DeviceExists;
private static VideoDriver videoDevice;
// Created null - NullReferenceException when calling GetFullScreenCanvas() with 0 overloads
private static Canvas MyVideoDriver = null;
public static Canvas GetFullScreenCanvas(Mode mode)
{
Global.mDebugger.SendInternal("GetFullScreenCanvas() with mode " + mode);
/* Use SVGAII When Exists in PCI */
if(SVGAIIExists)
videoDevice = VideoDriver.VMWareSVGAIIDriver;
// If there's no instance of a video driver created (which there isn't), create it:
if (MyVideoDriver == null)
{
// If running on VMWare and using SVGAII, then use that driver:
if (videoDevice == VideoDriver.VMWareSVGAIIDriver)
{
// Creates the instance
return MyVideoDriver = new SVGAIIScreen(mode);
}
// If not running on VMWare, then use the VESA BIOS Extensions:
else if (videoDevice == VideoDriver.VBEDriver)
{
// Creates the instance
return MyVideoDriver = new VBEScreen(mode);
}
}
/* We have already got a VideoDriver instance, simply change its mode */
MyVideoDriver.Mode = mode;
return MyVideoDriver;
}
public static Canvas GetFullScreenCanvas()
{
Global.mDebugger.SendInternal($"GetFullScreenCanvas() with default mode");
// If MyVideoDriver is null (hasn't checked if VMWare SVGA exists),
// Do necessary check and set to default gfx mode
if (MyVideoDriver == null)
{
return GetFullScreenCanvas(MyVideoDriver.DefaultGraphicMode);
}
// If it's not null, simply change graphics mode */
else
{
MyVideoDriver.Mode = MyVideoDriver.DefaultGraphicMode;
return MyVideoDriver;
}
// Old check left for reference
/*
if (videoDevice == VideoDriver.VMWareSVGAIIDriver)
{
/*
WARNING: MyVideoDriver is initiated as null - needs changing!
We have already got a VideoDriver instance
- reset its mode to DefaultGraphicMode */
return GetFullScreenCanvas(MyVideoDriver.DefaultGraphicMode);
}
else
{
}
*/
}
public static Canvas GetFullScreenCanvas(Mode mode)
{
Global.mDebugger.SendInternal($"GetFullScreenCanvas() with default mode");
// If MyVideoDriver is null (hasn't checked if VMWare SVGA exists),
// Do necessary check and set gfx mode as specified (mode)
if (MyVideoDriver == null)
{
if (SVGAIIExists)
{
// Set videoDevice to SVGA, initialize MyVideoDriver as an SVGA display using specified mode
// MyVideoDriver.Mode = mode; isn't exactly needed, just done in case it doesn't set.
// returns MyVideoDriver as the Canvas
videoDevice = VideoDriver.VMWareSVGAIIDriver;
MyVideoDriver = new SVGAIIScreen(mode);
MyVideoDriver.Mode = mode;
return MyVideoDriver;
}
else
{
// Does the same as above, this time using VESA BIOS Extensions (supported by loads of graphics cards)
videoDevice = VideoDriver.VBEDriver;
MyVideoDriver = new VBEScreen(mode);
MyVideoDriver.Mode = mode;
return MyVideoDriver;
}
}
else
{
// If MyVideoDriver has been initialized before (Graphics mode has previously been set)
// Change the graphics mode to the mode specified
MyVideoDriver.Mode = mode;
return MyVideoDriver;
}
}
}
}