banan-os/kernel/kernel/VesaTerminalDriver.cpp

167 lines
3.7 KiB
C++

#include <BAN/Errors.h>
#include <kernel/Debug.h>
#include <kernel/MMU.h>
#include <kernel/multiboot.h>
#include <kernel/VesaTerminalDriver.h>
extern const struct bitmap_font font;
VesaTerminalDriver* VesaTerminalDriver::Create()
{
if (!(g_multiboot_info->flags & MULTIBOOT_FLAGS_FRAMEBUFFER))
{
dprintln("Bootloader did not provide framebuffer");
return nullptr;
}
auto& framebuffer = g_multiboot_info->framebuffer;
if (framebuffer.type == MULTIBOOT_FRAMEBUFFER_TYPE_GRAPHICS)
{
if (framebuffer.bpp != 24 && framebuffer.bpp != 32)
{
dprintln("Unsupported bpp {}", framebuffer.bpp);
return nullptr;
}
dprintln("Graphics Mode {}x{} ({} bpp)", framebuffer.width, framebuffer.height, framebuffer.bpp);
}
else if (framebuffer.type == MULTIBOOT_FRAMEBUFFER_TYPE_TEXT)
{
dprintln("Text Mode is currently not supported");
return nullptr;
}
else
{
dprintln("Unknown framebuffer type {}", framebuffer.type);
return nullptr;
}
MMU::Get().AllocateRange(framebuffer.addr, framebuffer.pitch * framebuffer.height);
auto* driver = new VesaTerminalDriver(
framebuffer.width,
framebuffer.height,
framebuffer.pitch,
framebuffer.bpp,
framebuffer.addr,
font
);
driver->SetCursorPosition(0, 0);
driver->Clear(TerminalColor::BLACK);
return driver;
}
VesaTerminalDriver::~VesaTerminalDriver()
{
MMU::Get().UnAllocateRange(m_address, m_pitch * m_height);
}
void VesaTerminalDriver::SetPixel(uint32_t offset, Color color)
{
uint32_t* pixel = (uint32_t*)(m_address + offset);
switch (m_bpp)
{
case 24:
*pixel = (*pixel & 0xFF000000) | (color.rgb & 0x00FFFFFF);
break;
case 32:
*pixel = color.rgb;
break;
}
}
void VesaTerminalDriver::PutCharAt(uint16_t ch, uint32_t x, uint32_t y, Color fg, Color bg)
{
uint32_t glyph_index = 0;
for (uint32_t i = 0; i < m_font.Chars; i++)
{
if (m_font.Index[i] == ch)
{
glyph_index = i;
break;
}
}
const uint8_t* glyph = m_font.Bitmap + glyph_index * m_font.Height;
x *= m_font.Width;
y *= m_font.Height;
uint32_t row_offset = y * m_pitch + x * m_bpp / 8;
for (uint32_t dy = 0; dy < m_font.Height && y + dy < m_height; dy++)
{
uint32_t pixel_offset = row_offset;
for (uint32_t dx = 0; dx < m_font.Width && x + dx < m_width; dx++)
{
uint8_t bitmask = 1 << (font.Width - dx - 1);
SetPixel(pixel_offset, glyph[dy] & bitmask ? fg : bg);
pixel_offset += m_bpp / 8;
}
row_offset += m_pitch;
}
}
void VesaTerminalDriver::Clear(Color color)
{
if (m_bpp == 32)
{
uint32_t cells_per_row = m_pitch / 4;
for (uint32_t y = 0; y < m_height; y++)
for (uint32_t x = 0; x < m_width; x++)
((uint32_t*)m_address)[y * cells_per_row + x] = color.rgb;
return;
}
uint32_t row_offset = 0;
for (uint32_t y = 0; y < m_height; y++)
{
uint32_t pixel_offset = row_offset;
for (uint32_t x = 0; x < m_width; x++)
{
SetPixel(pixel_offset, color);
pixel_offset += m_bpp / 8;
}
row_offset += m_pitch;
}
}
void VesaTerminalDriver::SetCursorPosition(uint32_t x, uint32_t y)
{
ASSERT(m_font.Height == 16 && m_font.Width == 8);
constexpr uint8_t cursor[] = {
________,
________,
________,
________,
________,
________,
________,
________,
________,
________,
________,
________,
________,
XXXXXXXX,
XXXXXXXX,
________,
};
x *= m_font.Width;
y *= m_font.Height;
uint32_t row_offset = y * m_pitch + x * m_bpp / 8;
for (uint32_t dy = 0; dy < m_font.Height && y + dy < m_height; dy++)
{
uint32_t pixel_offset = row_offset;
for (uint32_t dx = 0; dx < m_font.Width && x + dx < m_width; dx++)
{
uint8_t bitmask = 1 << (font.Width - dx - 1);
if (cursor[dy] & bitmask)
SetPixel(pixel_offset, s_cursor_color);
pixel_offset += m_bpp / 8;
}
row_offset += m_pitch;
}
}