mirror of https://github.com/lefticus/6502-cpp.git
142 lines
3.4 KiB
C++
142 lines
3.4 KiB
C++
#include <array>
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#include <chrono>
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#include <cstdint>
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#include <cstring>
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#include <string_view>
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enum Colors : uint8_t { WHITE = 0x01 };
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static volatile uint8_t &memory_loc(const uint16_t loc) {
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return *reinterpret_cast<volatile uint8_t *>(loc);
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}
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static void poke(const uint16_t loc, const uint8_t value) {
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memory_loc(loc) = value;
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}
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static std::uint8_t peek(const std::uint16_t loc) { return memory_loc(loc); }
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static void decrement_border_color() { --memory_loc(0xd020); }
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static void increment_border_color() { ++memory_loc(0xd020); }
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static bool joystick_down() {
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uint8_t joystick_state = peek(0xDC00);
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return (joystick_state & 2) == 0;
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}
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void use_data(std::array<char, 1024> &data);
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static void puts(uint8_t x, uint8_t y, std::string_view str) {
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const auto start = 0x400 + (y * 40 + x);
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std::memcpy(const_cast<uint8_t *>(&memory_loc(start)), str.data(),
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str.size());
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}
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template<std::uint8_t Width, std::uint8_t Height>
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struct Graphic
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{
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std::array<std::uint8_t, Width * Height> data;
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static constexpr auto width() noexcept {
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return Width;
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}
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static constexpr auto height() noexcept {
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return Height;
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}
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constexpr Graphic() = default;
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constexpr Graphic(std::array<uint8_t, Width * Height> data_) noexcept : data(data_) {}
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constexpr Graphic(std::initializer_list<uint8_t> data_) noexcept {
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std::copy(begin(data_), end(data_), begin(data));
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}
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constexpr auto &operator()(const std::uint8_t x, const std::uint8_t y) noexcept {
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return data[y * Width + x];
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}
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constexpr const auto &operator()(const std::uint8_t x, const std::uint8_t y) const noexcept {
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return data[y * Width + x];
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}
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};
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static void putc(uint8_t x, uint8_t y, uint8_t c) {
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const auto start = 0x400 + (y * 40 + x);
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poke(start, c);
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}
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static void put_hex(uint8_t x, uint8_t y, uint8_t value) {
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const auto put_nibble = [](auto x, auto y, uint8_t nibble) {
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if (nibble <= 9) {
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putc(x, y, nibble + 48);
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} else {
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putc(x, y, nibble - 9);
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}
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};
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put_nibble(x + 1, y, 0xF & value);
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put_nibble(x, y, 0xF & (value >> 4));
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}
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static void put_hex(uint8_t x, uint8_t y, uint16_t value) {
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put_hex(x+2,y, static_cast<std::uint8_t>(0xFF & value));
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put_hex(x,y, static_cast<std::uint8_t>(0xFF & (value >> 8)));
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}
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static void put_graphic(uint8_t x, uint8_t y, const auto &graphic)
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{
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for (uint8_t cur_y = 0; cur_y < graphic.height(); ++cur_y) {
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for (uint8_t cur_x = 0; cur_x < graphic.width(); ++cur_x) {
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putc(cur_x + x, cur_y + y, graphic(cur_x, cur_y));
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}
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}
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}
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static void cls() {
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for (std::uint16_t i = 0x400; i < 0x400 + 1000; ++i) {
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poke(i, 32);
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}
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}
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struct Clock {
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using milliseconds = std::chrono::duration<std::uint16_t, std::milli>;
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// return elapsed time since last restart
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[[nodiscard]] milliseconds restart() {
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// stop Timer A
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poke(0xDC0E, 0b00000000);
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// last value
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const auto previous_value = static_cast<std::uint16_t>(
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peek(0xDC04) | (static_cast<uint16_t>(peek(0xDC05)) << 8));
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// reset timer
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poke(0xDC04, 0xFF);
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poke(0xDC05, 0xFF);
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// restart timer A
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poke(0xDC0E, 0b00010001);
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return milliseconds{0xFFFF - previous_value};
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}
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Clock() { [[maybe_unused]] const auto value = restart(); }
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};
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int main() {
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cls();
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auto fib = [f0 = 0u, f1 = 1u] mutable {
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f0 = std::exchange(f1, f0 + f1);
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return f0;
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};
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for (std::uint8_t y = 0; y < 25; ++y) {
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put_hex(30, y, fib());
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}
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}
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