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#include <efi.h>
#include <efilib.h>
#include "vga.h"
void * EFIAPI SetVideoMode(int width, int height, int bitdepth)
{
// find the location of the Graphics Output protocol to aquire a linear framebuffer
EFI_GUID EfiGOPGuid = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
struct _EFI_GRAPHICS_OUTPUT_PROTOCOL * Graphics = NULL;
Print(L"Searching for GOP\n");
EFI_STATUS localteprotocolstat = uefi_call_wrapper(BS->LocateProtocol, 3, &EfiGOPGuid, NULL, &Graphics);
if(localteprotocolstat != EFI_SUCCESS)
{
Print(L"Failed to locate GOP\n");
}
// we now search for a 1024x768 mode with a bit depth of 32bits
EFI_GRAPHICS_OUTPUT_PROTOCOL_MODE * GOPMode;
EFI_GRAPHICS_OUTPUT_MODE_INFORMATION * GOPInfo = NULL;
GOPMode = Graphics->Mode;
UINT32 MaxModes = GOPMode->MaxMode;
UINTN infosize = 0;
uefi_call_wrapper(Graphics->QueryMode, 4, Graphics, 0, &infosize, &GOPMode);
Print(L"Size of GOP Info: %d\n", infosize);
// print information about the available modes
UINT32 i;
uint64_t foundmode = 0;
for(i = 0; i < MaxModes; ++i)
{
uefi_call_wrapper(Graphics->QueryMode, 4, Graphics, i, &infosize, &GOPInfo);
/*
switch(GOPInfo->PixelFormat)
{
case PixelRedGreenBlueReserved8BitPerColor:
Print(L"RGBZ\n");
break;
case PixelBlueGreenRedReserved8BitPerColor:
Print(L"BGRZ\n");
break;
case PixelBitMask:
Print(L"By Mask\n");
break;
case PixelBltOnly:
Print(L"Only Blt\n"); // this mode doesn't expose a linear framebuffer
default:
Print(L"Unknown\n");
break;
}
*/
if(GOPInfo->HorizontalResolution == width && GOPInfo->VerticalResolution == height)
{
foundmode = i;
}
// Print(L"Mode %d: Width: %d Height: %d\n", i, GOPInfo->HorizontalResolution, GOPInfo->VerticalResolution);
}
uefi_call_wrapper(Graphics->SetMode, 2, Graphics, foundmode); // hardcoded to mode 2(1024x768), this is only tue for the cirrus vga that qemu exposes
uefi_call_wrapper(ST->ConOut->ClearScreen, 1, ST->ConOut); // clear the screen
//uefi_call_wrapper(Graphics->QueryMode, 4, Graphics, i, &infosize, &GOPInfo);
Print(L"Width: %d Height: %d Format: ", Graphics->Mode->Info->HorizontalResolution, Graphics->Mode->Info->VerticalResolution);
switch(Graphics->Mode->Info->PixelFormat)
{
case PixelRedGreenBlueReserved8BitPerColor:
Print(L"RGBZ\n");
break;
case PixelBlueGreenRedReserved8BitPerColor:
Print(L"BGRZ\n");
break;
case PixelBitMask:
Print(L"By Mask\n");
break;
case PixelBltOnly:
Print(L"Only Blt\n");
default:
Print(L"Unknown\n");
break;
}
Print(L"RedBitmask: %d\n", Graphics->Mode->Info->PixelInformation.RedMask);
Print(L"GreenBitmask: %d\n", Graphics->Mode->Info->PixelInformation.GreenMask);
Print(L"BlueBitmask: %d\n", Graphics->Mode->Info->PixelInformation.BlueMask);
Print(L"ReservedBitmask: %d\n", Graphics->Mode->Info->PixelInformation.ReservedMask);
Print(L"Pixels Per ScanLine: %d\n", Graphics->Mode->Info->PixelsPerScanLine);
// pixels seem to be 4 bytes wide(32bits)
// format seems to be RGB Reserved
//Print(L"FrameBuffer Size: %d\n", Graphics->Mode->FrameBufferSize);
//Print(L"FrameBuffer Addr: %d\n", Graphics->Mode->FrameBufferBase);
return (void*)Graphics->Mode->FrameBufferBase;
}
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