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6502-cpp/pong2.cpp
Jason Turner 74b2f129bf Pong fully working
2016-08-13 08:13:27 -06:00

287 lines
7.9 KiB
C++
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#include <cstdint>
#include <array>
#include <utility>
#include <algorithm>
constexpr uint16_t SPRITE_DATA_POINTERS = 2040;
constexpr uint16_t VIDEO_REGISTERS = 53248;
constexpr uint16_t SPRITE_ENABLE_BITS = VIDEO_REGISTERS + 21;
constexpr uint16_t SPRITE_EXPAND_HORIZONTAL = VIDEO_REGISTERS + 29;
constexpr uint16_t SPRITE_EXPAND_VERTICAL = VIDEO_REGISTERS + 23;
constexpr uint16_t SPRITE_POSITION_REGISTERS = VIDEO_REGISTERS;
constexpr uint16_t SPRITE_COLLISIONS = VIDEO_REGISTERS + 30;
constexpr uint16_t SPRITE_MULTICOLOR = VIDEO_REGISTERS + 28;
constexpr uint16_t VIDEO_MEMORY = 1024;
constexpr uint8_t SPRITE_STARTING_BANK = 192;
namespace {
volatile uint8_t &memory(const uint16_t loc)
{
return *reinterpret_cast<uint8_t *>(loc);
}
constexpr bool test_bit(const uint8_t data, const uint8_t bit)
{
return (data & (1 << bit)) != 0;
};
void set_bit(const uint16_t loc, const uint8_t bitnum, bool val)
{
if (val) {
memory(loc) |= (1 << bitnum);
} else {
memory(loc) &= (0xFF ^ (1 << bitnum));
}
}
void write_multi_color_pixel(uint16_t)
{
}
void write_pixel(uint16_t)
{
}
template<typename D1, typename D2, typename D3, typename D4, typename ... D >
void write_multi_color_pixel(uint16_t loc, D1 d1, D2 d2, D3 d3, D4 d4, D ... d)
{
memory(loc) = (d1 << 6) | (d2 << 4) | (d3 << 2) | d4;
write_multi_color_pixel(loc + 1, d...);
}
template<typename D1, typename D2, typename D3, typename D4, typename D5, typename D6, typename D7, typename D8, typename ... D >
void write_pixel(uint16_t loc, D1 d1, D2 d2, D3 d3, D4 d4, D5 d5, D6 d6, D7 d7, D8 d8, D ... d)
{
memory(loc) = (d1 << 7) | (d2 << 6) | (d3 << 5) | (d4 << 4) | (d5 << 3) | (d6 << 2) | (d7 << 1) | d8;
write_pixel(loc + 1, d...);
}
template<typename ... D>
void make_sprite(uint8_t memory_loc, D ... d)
{
if constexpr (sizeof...(d) == 12 * 21) {
write_multi_color_pixel((SPRITE_STARTING_BANK + memory_loc) * 64, d...);
} else {
write_pixel((SPRITE_STARTING_BANK + memory_loc) * 64, d...);
}
}
void enable_sprite(const uint8_t sprite_number, const uint8_t memory_loc,
const bool multicolor,
const bool double_width, const bool double_height)
{
set_bit(SPRITE_ENABLE_BITS, sprite_number, true);
memory(SPRITE_DATA_POINTERS + sprite_number) = SPRITE_STARTING_BANK + memory_loc;
set_bit(SPRITE_EXPAND_HORIZONTAL, sprite_number, double_width);
set_bit(SPRITE_EXPAND_VERTICAL, sprite_number, double_height);
set_bit(SPRITE_MULTICOLOR, sprite_number, multicolor);
}
void display(uint8_t x, uint8_t y, uint8_t val)
{
memory(VIDEO_MEMORY + y * 40 + x) = val;
}
auto joystick(const uint8_t port) {
struct State{
State(const uint8_t portdata)
: up(!test_bit(portdata,0)),
down(!test_bit(portdata,1)),
left(!test_bit(portdata,2)),
right(!test_bit(portdata,3)),
fire(!test_bit(portdata,4))
{
}
bool up;
bool down;
bool left;
bool right;
bool fire;
};
if (port == 2) {
return State(memory(56320));
} else {
return State(memory(56321));
}
};
volatile uint8_t &sprite_x(const uint8_t sprite_num)
{
return memory(SPRITE_POSITION_REGISTERS + sprite_num * 2);
};
volatile uint8_t &sprite_y(const uint8_t sprite_num)
{
return memory(SPRITE_POSITION_REGISTERS + sprite_num * 2 + 1);
};
}
int main()
{
make_sprite(0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,
0,0,0,0,0,0,1,1,0,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,
0,0,0,0,0,1,1,0,0,0,1,1,1,1,1,1,1,1,1,0,0,0,0,0,
0,0,0,0,0,1,1,1,0,1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,
0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,
0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,
0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,
0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,
0,0,0,0,1,1,0,0,0,0,0,0,0,0,0,0,0,0,1,1,0,0,0,0,
0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,
0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,
0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,
0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,
0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
);
enable_sprite(0, 0, false, false, false);
make_sprite(1,
0,0,0,0,0,2,2,0,0,0,0,0,
0,0,0,0,0,2,2,0,0,0,0,0,
0,0,0,0,0,2,2,0,0,0,0,0,
0,0,0,0,0,2,2,0,0,0,0,0,
0,0,0,0,0,2,2,0,0,0,0,0,
0,0,0,0,0,2,2,0,0,0,0,0,
0,0,0,0,0,2,2,0,0,0,0,0,
0,0,0,0,0,2,2,0,0,0,0,0,
0,0,0,0,0,2,2,0,0,0,0,0,
0,0,0,0,0,2,2,0,0,0,0,0,
0,0,0,0,0,2,2,0,0,0,0,0,
0,0,0,0,0,2,2,0,0,0,0,0,
0,0,0,0,0,2,2,0,0,0,0,0,
0,0,0,0,0,2,2,0,0,0,0,0,
0,0,0,0,0,2,2,0,0,0,0,0,
0,0,0,0,0,2,2,0,0,0,0,0,
0,0,0,0,0,3,3,0,0,0,0,0,
0,0,0,0,0,1,1,0,0,0,0,0,
0,0,0,0,0,3,3,0,0,0,0,0,
0,0,0,0,0,1,1,0,0,0,0,0,
0,0,0,0,0,3,3,0,0,0,0,0
);
enable_sprite(1, 1, true, false, true);
enable_sprite(2, 1, true, false, true);
const auto sprite_collisions = []() {
const auto collisions = memory(SPRITE_COLLISIONS);
memory(SPRITE_COLLISIONS) = 0;
struct Col_Data {
bool sprite0;
bool sprite1;
bool sprite2;
bool sprite3;
bool sprite4;
bool sprite5;
bool sprite6;
bool sprite7;
};
return Col_Data{test_bit(collisions, 0),test_bit(collisions, 1),test_bit(collisions, 2),test_bit(collisions, 3),
test_bit(collisions, 4),test_bit(collisions, 5),test_bit(collisions, 6),test_bit(collisions, 7)};
};
std::pair<int8_t, int8_t> ball_vec{1,1};
const auto reset_ball = [&]{
sprite_x(0) = 255/2;
sprite_y(0) = 255/2;
};
reset_ball();
sprite_x(1) = 15;
sprite_y(1) = 255/2;
sprite_x(2) = 255;
sprite_y(2) = 255/2;
memory(53280) = 12;
memory(53281) = 0;
struct Player
{
void update_position()
{
if (const auto joy = joystick(player_num);
joy.up)
{
sprite_y(player_num) += 3;
} else if (joy.down) {
sprite_y(player_num) -= 3;
}
};
void scored() {
++score;
}
const uint8_t player_num;
uint8_t score = '0';
};
Player p1{1};
Player p2{2};
const auto raster_off_screen = [](){
return memory(53266) == 250 && !test_bit(memory(53265),7);
};
while (true) {
if (raster_off_screen())
{
if (const auto collisions = sprite_collisions();
collisions.sprite0 && (collisions.sprite1 || collisions.sprite2))
{
std::get<0>(ball_vec) *= -1; //invert ball x velocity
// "bounce" ball out of collision area
sprite_x(0) += std::get<0>(ball_vec);
}
// Update paddle positions
p1.update_position();
p2.update_position();
// ball hit the top or bottom wall
if (const auto ball_y = sprite_y(0) += std::get<1>(ball_vec);
ball_y == 45 || ball_y == 235)
{
std::get<1>(ball_vec) *= -1;
}
if (const auto ball_x = sprite_x(0) += std::get<0>(ball_vec);
ball_x == 1) {
// ball hit left wall, player 2 scored
p2.scored();
reset_ball();
} else if (ball_x == 255) {
// ball hit right wall, player 1 scored
p1.scored();
reset_ball();
}
display(10, 12, p1.score);
display(30, 12, p2.score);
}
}
}
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