derek/HansTheGatherer
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Use C++ random device

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This commit is contained in:
Derek Christ
2025-06-01 12:17:49 +02:00
parent ae5733ae62
commit 81f4d6157e
3 changed files with 23 additions and 18 deletions
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2
src/definitions.hpp
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@@ -2,6 +2,7 @@
#include <SDL3/SDL.h>
#include <SDL3_ttf/SDL_ttf.h>
#include <random>
static constexpr int WINDOW_WIDTH = 400;
static constexpr int WINDOW_HEIGHT = 240;
@@ -18,4 +19,5 @@ struct Game
uint32_t ticks;
int32_t time;
int32_t score;
std::default_random_engine random_engine;
};

37
src/level.hpp
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@@ -54,50 +54,53 @@ struct LevelModule
.set<Size>(Size{.w = 64, .h = 16})
.add<CollisionBox>();
world.system<Game const, TextureAssets const>("SpawnFruits")
world.system<Game, TextureAssets const>("SpawnFruits")
.term_at(0)
.singleton()
.term_at(1)
.singleton()
.each(
[](flecs::iter& it,
size_t index,
Game const& game,
TextureAssets const& texture_assets)
[](flecs::iter& it, size_t index, Game& game, TextureAssets const& texture_assets)
{
bool spider = std::rand() % 3 == 0;
int vel = std::rand() % 3 + 1;
std::bernoulli_distribution spider_dist(0.25);
bool spider = spider_dist(game.random_engine);
std::binomial_distribution<> velocity_dist(3, 0.5);
int vel = velocity_dist(game.random_engine) + 1;
if ((game.ticks % 50) == 0)
{
flecs::entity e;
std::uniform_int_distribution<> xpos_dist(32, WINDOW_WIDTH - 32);
int xpos = xpos_dist(game.random_engine);
if (!spider)
{
std::uniform_int_distribution<> index_dist(0, 228 - 1);
uint16_t index = index_dist(game.random_engine);
e = it.world()
.entity()
.add<Fruit>()
.add<WorldPosition>()
.set<Position>(
Position{.x = std::rand() % WINDOW_WIDTH, .y = -16})
.set<Position>(Position{.x = xpos, .y = -16})
.set<Velocity>(Velocity{.x = 0, .y = vel})
.set<Sprite>(
Sprite{.texture = &texture_assets.fruits,
.texture_atlas_index =
static_cast<uint16_t>(std::rand() % 228)})
.set<Sprite>(Sprite{.texture = &texture_assets.fruits,
.texture_atlas_index = index})
.set<Size>(Size{.w = 32, .h = 32});
}
else
{
std::uniform_int_distribution<> index_dist(0, 8 - 1);
uint16_t index = index_dist(game.random_engine);
e = it.world()
.entity()
.add<Spider>()
.add<WorldPosition>()
.set<Position>(
Position{.x = std::rand() % WINDOW_WIDTH, .y = -16})
.set<Position>(Position{.x = xpos, .y = -16})
.set<Velocity>(Velocity{.x = 0, .y = vel})
.set<Sprite>(Sprite{.texture = &texture_assets.spiders,
.texture_atlas_index =
static_cast<uint16_t>(std::rand() % 8)})
.texture_atlas_index = index})
.set<Size>(Size{.w = 32, .h = 32});
}
it.world()

2
src/main.cpp
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@@ -45,7 +45,7 @@ int main()
flecs::world world;
world.set<Game>(Game{.ticks = 0, .time = 60, .score = 0});
world.set<Game>(Game{.ticks = 0, .time = 60, .score = 0, .random_engine = {}});
world.set<ButtonInput>(ButtonInput{});
world.set<SdlHandles>(
SdlHandles{.window = window, .renderer = renderer, .text_engine = text_engine});