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Implement non linear framebuffer detection for VBE multiboot

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Real hardware doesn't often use a linear framebuffer. It can causes graphics issues.
This commit is contained in:
valentinbreiz 2020-12-24 03:21:02 +01:00
parent 274c5c8b7a
commit 2f2cd626e3
1 changed files with 15 additions and 2 deletions
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17
source/Cosmos.HAL2/Drivers/Video/VBEDriver.cs
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@ -81,8 +81,21 @@ namespace Cosmos.HAL.Drivers
if (VBE.IsAvailable()) //VBE VESA Enabled Mulitboot Parsing
{
Global.mDebugger.SendInternal($"Creating VBE VESA driver with Mode {xres}*{yres}@{bpp}");
IO.LinearFrameBuffer = new MemoryBlock(VBE.getLfbOffset(), (uint)xres * yres * (uint)(bpp / 8));
lastbuffer = new ManagedMemoryBlock((uint)xres * yres * (uint)(bpp / 8));
var ModeInfo = VBE.getModeInfo();
if ((ModeInfo.pitch / 4) == ModeInfo.width) //linear framebuffer detection
{
IO.LinearFrameBuffer = new MemoryBlock(VBE.getLfbOffset(), (uint)xres * yres * (uint)(bpp / 8));
lastbuffer = new ManagedMemoryBlock((uint)xres * yres * (uint)(bpp / 8));
}
else
{
uint OffScreenSize = (ModeInfo.pitch / (uint)(bpp / 8)) - ModeInfo.width;
IO.LinearFrameBuffer = new MemoryBlock(VBE.getLfbOffset(), (uint)(xres * yres * (uint)(bpp / 8)) + (OffScreenSize * yres * (uint)(bpp / 8)));
lastbuffer = new ManagedMemoryBlock((uint)(xres * yres * (uint)(bpp / 8)) + (OffScreenSize * yres * (uint)(bpp / 8)));
}
}
else if (ISAModeAvailable()) //Bochs Graphics Adaptor ISA Mode
{