neop/randomwalk
neop/randomwalk
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basic random walk with fancy out_ptr

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This commit is contained in:
Jakob Hördt 2024-08-03 03:23:16 +02:00
parent 9f82d9458c
commit c718bd5e3f
1 changed files with 48 additions and 6 deletions
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54
main.cpp
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@ -4,12 +4,29 @@
#include <memory>
#include <print>
#include <random>
template <auto sdl_destroyfunc>
using sdl_deleter_t = decltype([](auto* ptr) { sdl_destroyfunc(ptr); });
using window_t = std::unique_ptr<SDL_Window, sdl_deleter_t<SDL_DestroyWindow>>;
using surface_t = std::unique_ptr<SDL_Surface, sdl_deleter_t<SDL_FreeSurface>>;
template <class SDLT, auto sdl_destroyfunc>
using sdl_wrapper_t = std::unique_ptr<SDLT, sdl_deleter_t<sdl_destroyfunc>>;
using window_t = sdl_wrapper_t<SDL_Window, SDL_DestroyWindow>;
using surface_t = sdl_wrapper_t<SDL_Surface, SDL_FreeSurface>;
using renderer_t = sdl_wrapper_t<SDL_Renderer, SDL_DestroyRenderer>;
struct Point {
int x;
int y;
};
auto operator+(Point a, Point b) {
return Point{.x = a.x + b.x, .y = a.y + b.y};
}
constexpr int width = 3440;
constexpr int height = 1440;
int main() {
if (SDL_Init(SDL_INIT_VIDEO) < 0) {
@ -18,10 +35,15 @@ int main() {
}
{
auto window = window_t{SDL_CreateWindow(
"SDL Tutorial", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
1024, 512, SDL_WINDOW_SHOWN
)};
renderer_t renderer;
window_t window;
SDL_CreateWindowAndRenderer(
width, height, SDL_WINDOW_SHOWN | SDL_WINDOW_FULLSCREEN,
std::out_ptr(window), std::out_ptr(renderer)
);
SDL_SetRenderDrawColor(renderer.get(), 0, 0, 0, 0);
SDL_RenderClear(renderer.get());
SDL_SetRenderDrawColor(renderer.get(), 255, 0, 0, 255);
if (!window) {
std::println(
@ -32,12 +54,32 @@ int main() {
auto surface = surface_t{SDL_GetWindowSurface(window.get())};
auto point = Point{.x = width / 2, .y = height / 2};
const Point directions[] = {
{.x = -1, .y = 0},
{.x = 1, .y = 0},
{.x = 0, .y = -1},
{.x = 0, .y = 1}
};
std::mt19937_64 rne(std::random_device{}());
std::uniform_int_distribution<int> dist(0, 3);
SDL_Event e;
bool quit = false;
while (!quit) {
while (SDL_PollEvent(&e)) {
if (e.type == SDL_QUIT) { quit = true; }
}
SDL_RenderDrawPoint(renderer.get(), point.x, point.y);
Point newpoint;
do {
newpoint = point + directions[dist(rne)];
} while (newpoint.x < 0 or newpoint.x >= width or newpoint.y < 0 or
newpoint.y >= height);
point = newpoint;
SDL_RenderPresent(renderer.get());
}
}