graphics.cpp

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#include <stdexcept>
 
#include "load_elf.h"
#include "ostream.hpp"
 
Graphics::Graphics() {
  auto status = LibLocateProtocol(&GraphicsOutputProtocol,
                                  reinterpret_cast<void **>(&gop));
  if (EFI_ERROR(status)) {
    debug << L"Could not locate GOP: " << status << ostream::endl;
    throw std::runtime_error("EFI_ERROR(status)");
  }
  if (gop == nullptr) {
    debug << L"LibLocateProtocol(GraphicsOutputProtocol, &gop) returned "
          << status << " but gop is nullptr" << ostream::endl;
 
    throw std::runtime_error("gop == nullptr");
  }
}
 
void Graphics::set_mode(EFI_GRAPHICS_PIXEL_FORMAT _format, uint32_t _width,
                        uint32_t _height) const {
  EFI_STATUS status = EFI_SUCCESS;
 
  for (uint32_t i = 0; i < gop->Mode->MaxMode; i++) {
    EFI_GRAPHICS_OUTPUT_MODE_INFORMATION *mode_info = nullptr;
    uint64_t mode_info_size = 0;
    status = uefi_call_wrapper(gop->QueryMode, 4, gop, i, &mode_info_size,
                               &mode_info);
    if (EFI_ERROR(status)) {
      debug << L"QueryMode failed: " << status << ostream::endl;
      throw std::runtime_error("EFI_ERROR(status)");
    }
 
    if ((mode_info->PixelFormat == _format) &&
        (mode_info->HorizontalResolution == _width) &&
        (mode_info->VerticalResolution == _height)) {
      status = uefi_call_wrapper(gop->SetMode, 2, gop, i);
      if (EFI_ERROR(status)) {
        debug << L"SetMode failed: " << status << ostream::endl;
        throw std::runtime_error("EFI_ERROR(status)");
      }
    }
    status = uefi_call_wrapper(gBS->FreePool, 1, mode_info);
    if (EFI_ERROR(status)) {
      debug << L"FreePool failed: " << status << ostream::endl;
      throw std::runtime_error("EFI_ERROR(status)");
    }
  }
 
  debug << L"Current Mode: " << gop->Mode->Mode << L", Version: "
        << ostream::hex_x << gop->Mode->Info->Version << L", Format: "
        << gop->Mode->Info->PixelFormat << L", Horizontal: "
        << gop->Mode->Info->HorizontalResolution << L", Vertical: "
        << gop->Mode->Info->VerticalResolution << L", ScanLine: "
        << gop->Mode->Info->PixelsPerScanLine << L", FrameBufferBase: "
        << ostream::hex_X << gop->Mode->FrameBufferBase
        << L", FrameBufferSize: " << ostream::hex_X
        << gop->Mode->FrameBufferSize << ostream::endl;
}
 
void Graphics::print_info() const {
  debug << L"Current Mode: " << gop->Mode->Mode << L", Version: "
        << ostream::hex_x << gop->Mode->Info->Version << L", Format: "
        << gop->Mode->Info->PixelFormat << L", Horizontal: "
        << gop->Mode->Info->HorizontalResolution << L", Vertical: "
        << gop->Mode->Info->VerticalResolution << L", ScanLine: "
        << gop->Mode->Info->PixelsPerScanLine << L", FrameBufferBase: "
        << ostream::hex_X << gop->Mode->FrameBufferBase
        << L", FrameBufferSize: " << ostream::hex_X
        << gop->Mode->FrameBufferSize << ostream::endl;
 
  for (uint32_t i = 0; i < gop->Mode->MaxMode; i++) {
    EFI_GRAPHICS_OUTPUT_MODE_INFORMATION *mode_info = nullptr;
    uint64_t mode_info_size = 0;
    auto status = uefi_call_wrapper(gop->QueryMode, 4, gop, i, &mode_info_size,
                                    &mode_info);
    if (EFI_ERROR(status)) {
      debug << L"QueryMode failed: " << status << ostream::endl;
      throw std::runtime_error("EFI_ERROR(status)");
    }
 
    debug << L"Mode: " << i << L", Version: " << ostream::hex_x
          << gop->Mode->Info->Version << L", Format: "
          << gop->Mode->Info->PixelFormat << L", Horizontal: "
          << gop->Mode->Info->HorizontalResolution << L", Vertical: "
          << gop->Mode->Info->VerticalResolution << L", ScanLine: "
          << gop->Mode->Info->PixelsPerScanLine << ostream::endl;
 
    status = uefi_call_wrapper(gBS->FreePool, 1, mode_info);
    if (EFI_ERROR(status)) {
      debug << L"FreePool failed: " << status << ostream::endl;
      throw std::runtime_error("EFI_ERROR(status)");
    }
  }
}