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#include "arch/video/vga/text.hpp"
#include "arch/video/vga/io.hpp"
#include "memory/asm_pointer.hpp"
#include <algorithm>
#include <string_view>
#include <utility>
extern "C" std::pair<char, teachos::arch::video::vga::text::attribute> * vga_buffer_pointer;
namespace teachos::arch::video::vga::text
{
namespace
{
auto constexpr DEFAULT_TEXT_BUFFER_WIDTH = 80U;
auto constexpr DEFAULT_TEXT_BUFFER_HEIGHT = 25U;
auto constinit text_buffer = teachos::memory::asm_pointer{vga_buffer_pointer};
} // namespace
auto clear(attribute attribute) -> void
{
*text_buffer = reinterpret_cast<decltype(text_buffer)::pointer>(DEFAULT_VGA_TEXT_BUFFER_ADDRESS);
std::ranges::fill_n(*text_buffer, 2000, std::pair{' ', attribute});
}
auto cursor(bool enabled) -> void
{
auto cursor_disable_byte = std::byte{!enabled} << 5;
crtc::address_port::write(crtc::registers::cursor_start);
crtc::data_port::write(vga::crtc::data_port::read() | cursor_disable_byte);
}
auto newline() -> void
{
auto base = reinterpret_cast<decltype(text_buffer)::pointer>(DEFAULT_VGA_TEXT_BUFFER_ADDRESS);
auto & raw_buffer = *text_buffer;
auto current_line = (raw_buffer - base) / DEFAULT_TEXT_BUFFER_WIDTH;
auto next_line = current_line + 1;
if (next_line >= DEFAULT_TEXT_BUFFER_HEIGHT)
{
auto begin = base + DEFAULT_TEXT_BUFFER_WIDTH;
auto end = base + DEFAULT_TEXT_BUFFER_WIDTH * DEFAULT_TEXT_BUFFER_HEIGHT;
std::ranges::move(begin, end, base);
raw_buffer = base + current_line * DEFAULT_TEXT_BUFFER_WIDTH;
}
else
{
raw_buffer = base + next_line * DEFAULT_TEXT_BUFFER_WIDTH;
}
}
auto write_char(char code_point, attribute attribute) -> void
{
auto & p = *text_buffer;
(*p++) = std::pair{code_point, attribute};
};
auto write(std::string_view code_points, attribute attribute) -> void
{
std::ranges::for_each(code_points, [&](auto code_point) { write_char(code_point, attribute); });
}
} // namespace teachos::arch::video::vga::text
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