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cleanup Rng impl

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This commit is contained in:
Grant Horner
2025-11-30 19:46:40 -05:00
parent 53f1264c5f
commit 275da1bd65
1 changed files with 63 additions and 31 deletions
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92
main.cpp
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@@ -7,8 +7,8 @@
#include "types.h"
auto screen_width = 800;
auto screen_height = 600;
float screen_width = 800;
float screen_height = 600;
Rectangle walls[] = {
// {.x = 100, .y = 100, .width = 5, .height = 100}
};
@@ -25,26 +25,43 @@ float tear_radius = 10.0f;
double last_fired = 0;
double fire_rate = .5;
std::random_device dev;
std::mt19937 rng(dev());
std::mutex enemy_mutex;
float enemy_max_speed = 2.0;
float enemy_radius = 25.0;
Enemy enemies[100] = {};
struct Rng {
static std::random_device dev;
static std::mt19937 rng;
static float generate() {
return static_cast<float>(rng()) / static_cast<float>(std::mt19937::max());
}
static float generate(const uint32_t max) {
return generate() * static_cast<float>(max);
}
static float generate(const int min, const int max) {
return generate() * (static_cast<float>(max) - static_cast<float>(min)) + static_cast<float>(min);
}
};
std::random_device Rng::dev{};
std::mt19937 Rng::rng{dev()};
Vector2 Player::center() const noexcept {
return {.x = this->x + this->width / 2, .y = this->y + this->height / 2};
}
void Player::move(const float delta_x, const float delta_y) {
auto x = std::min(
const auto x = std::min(
std::max(this->x + delta_x, 0.0f),
static_cast<float>(screen_width) - this->width);
screen_width - this->width);
auto y = std::min(
const auto y = std::min(
std::max(this->y + delta_y, 0.0f),
static_cast<float>(screen_height) - this->height);
screen_height - this->height);
bool collided = false;
const Rectangle next_position = {
@@ -88,29 +105,35 @@ struct EnemySpawner {
if (!paused.load()) {
std::lock_guard lock(enemy_mutex);
const auto num = static_cast<float>(rng()) / static_cast<float>(std::mt19937::max());
const auto dir = static_cast<float>(rng()) / static_cast<float>(std::mt19937::max());
const auto num = Rng::generate();
const auto starting_x = Rng::generate(static_cast<uint32_t>(screen_width));
const auto starting_y = Rng::generate(static_cast<uint32_t>(screen_height));
for (auto &[center, radius, moving, alive]: enemies) {
if (alive) continue;
alive = true;
radius = enemy_radius;
const float normalized_dir = Rng::generate(-1, 1);
if (num < 0.25) {
center = {.x = static_cast<float>(screen_width) / 2, .y = 0};
moving = {.x = (dir - 1) * 2, .y = 1};
center = {.x = starting_x, .y = 0};
moving = {.x = normalized_dir, .y = 1};
} else if (0.25 <= num && num < 0.5) {
center = {.x = static_cast<float>(screen_width) / 2, .y = static_cast<float>(screen_height)};
moving = {.x = (dir - 1) * 2, .y = -1};
center = {
.x = starting_x, .y = (screen_height)
};
moving = {.x = normalized_dir, .y = -1};
} else if (0.5 <= num && num < 0.75) {
center = {.x = 0, .y = static_cast<float>(screen_height) / 2};
moving = {.x = 1, .y = (dir - 1) * 2};
center = {.x = 0, .y = starting_y};
moving = {.x = 1, .y = normalized_dir};
} else {
center = {.x = static_cast<float>(screen_width), .y = static_cast<float>(screen_height) / 2};
moving = {.x = -1, .y = (dir - 1) * 2};
center = {
.x = (screen_width), .y = starting_y
};
moving = {.x = -1, .y = normalized_dir};
}
const auto speed_ratio = static_cast<float>(rng()) / static_cast<float>(std::mt19937::max());
const auto speed = speed_ratio * enemy_max_speed;
const auto speed = Rng::generate(static_cast<uint32_t>(enemy_max_speed));
moving = Vector2Scale(moving, speed);
break;
@@ -189,10 +212,11 @@ int main() {
EnemySpawner spawner{3};
spawner.start();
player.x = 10;
player.y = 10;
player.width = 50;
player.height = 50;
player.x = screen_width / 2 - player.width / 2;
player.y = screen_height / 2 - player.height / 2;
std::string score_text_buffer{64};
score_text_buffer.reserve(64);
@@ -200,8 +224,8 @@ int main() {
while (!WindowShouldClose()) {
if (IsWindowResized()) {
screen_height = GetScreenHeight();
screen_width = GetScreenWidth();
screen_height = static_cast<float>(GetScreenHeight());
screen_width = static_cast<float>(GetScreenWidth());
}
float delta_x = 0;
@@ -249,15 +273,23 @@ int main() {
}
}
for (auto& enemy: enemies) {
if (enemy.alive) {
enemy.center = Vector2Add(enemy.center, enemy.moving);
DrawCircleV(enemy.center, enemy.radius, RED);
{
std::lock_guard enemy_guard{enemy_mutex};
for (auto &[center, radius, moving, alive]: enemies) {
if (alive) {
center = Vector2Add(center, moving);
DrawCircleV(center, radius, RED);
if (center.x < 0 || screen_width < center.x ||
center.y < 0 || screen_height < center.y) {
alive = false;
}
}
}
}
std::format_to(std::back_inserter(score_text_buffer), "Score: {}", score);
DrawText(score_text_buffer.c_str(), 50, screen_height - 100, 20, BLACK);
DrawText(score_text_buffer.c_str(), 50, static_cast<int>(screen_height) - 100, 20, BLACK);
score_text_buffer.clear();
EndDrawing();