neop/randomwalk
neop/randomwalk
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defer SDL_Quit()

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This commit is contained in:
Jakob Hördt 2024-08-03 22:40:14 +02:00
parent 3c725d105e
commit ae43c1c0ef
1 changed files with 92 additions and 85 deletions
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51
main.cpp
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@ -39,25 +39,29 @@ auto operator==(const SDL_Point& a, const SDL_Point& b) {
constexpr int width = 3440; constexpr int width = 3440;
constexpr int height = 1440; constexpr int height = 1440;
template <auto EF>
struct [[nodiscard("give this a name so SDL_Quit is called at the end"
)]] Defer {
Defer() = default;
Defer(const Defer&) = delete;
Defer(Defer&&) = delete;
auto operator=(Defer&&) = delete;
auto operator=(const Defer&) = delete;
~Defer() { EF(); }
};
int main() { int main() {
if (SDL_Init(SDL_INIT_VIDEO) < 0) { if (SDL_Init(SDL_INIT_VIDEO) < 0) {
std::println("fuck"); std::println("fuck");
return EXIT_FAILURE; return EXIT_FAILURE;
} }
Defer<SDL_Quit> defer_SDL_Quit;
{
window_t window{SDL_CreateWindow( window_t window{SDL_CreateWindow(
"random walk", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, "random walk", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, width,
width, height, SDL_WINDOW_FULLSCREEN height, SDL_WINDOW_FULLSCREEN
)}; )};
renderer_t renderer{
SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED)
};
SDL_SetRenderDrawColor(renderer, 0, 0, 0, 0);
SDL_RenderClear(renderer);
SDL_SetRenderDrawColor(renderer, 255, 0, 0, 255);
if (!window) { if (!window) {
std::println( std::println(
"Window could not be created! SDL_Error: {}", SDL_GetError() "Window could not be created! SDL_Error: {}", SDL_GetError()
@ -65,16 +69,23 @@ int main() {
return EXIT_FAILURE; return EXIT_FAILURE;
} }
// owned by window
// auto* window_surface = SDL_GetWindowSurface(window);
renderer_t renderer{SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED)
};
SDL_SetRenderDrawColor(renderer, 0, 0, 0, 0);
SDL_RenderClear(renderer);
SDL_SetRenderDrawColor(renderer, 255, 0, 0, 255);
auto surface = surface_t{SDL_GetWindowSurface(window)}; auto surface = surface_t{SDL_GetWindowSurface(window)};
std::vector<SDL_Point> points; std::vector<SDL_Point> points;
SDL_Point pos{.x = width / 2, .y = height / 2}; SDL_Point pos{.x = width / 2, .y = height / 2};
points.push_back(pos); points.push_back(pos);
const SDL_Point directions[] = { const SDL_Point directions[] = {
{.x = -1, .y = 0}, {.x = -1, .y = 0}, {.x = 1, .y = 0}, {.x = 0, .y = -1}, {.x = 0, .y = 1}
{.x = 1, .y = 0},
{.x = 0, .y = -1},
{.x = 0, .y = 1}
}; };
std::mt19937_64 rne(std::random_device{}()); std::mt19937_64 rne(std::random_device{}());
@ -89,8 +100,8 @@ int main() {
SDL_Point newpoint; SDL_Point newpoint;
do { do {
newpoint = pos + directions[dist(rne)]; newpoint = pos + directions[dist(rne)];
} while (newpoint.x < 0 or newpoint.x >= width or } while (newpoint.x < 0 or newpoint.x >= width or newpoint.y < 0 or
newpoint.y < 0 or newpoint.y >= height); newpoint.y >= height);
pos = newpoint; pos = newpoint;
points.push_back(newpoint); points.push_back(newpoint);
++total_points; ++total_points;
@ -118,9 +129,7 @@ int main() {
points.resize(std::ranges::distance(points.begin(), first)); points.resize(std::ranges::distance(points.begin(), first));
} }
SDL_SetRenderDrawColor(renderer, 255, 0, 0, 255); SDL_SetRenderDrawColor(renderer, 255, 0, 0, 255);
SDL_RenderDrawPoints( SDL_RenderDrawPoints(renderer, points.data(), std::ssize(points));
renderer, points.data(), std::ssize(points)
);
SDL_RenderPresent(renderer); SDL_RenderPresent(renderer);
SDL_SetRenderDrawColor(renderer, 0, 0, 0, 0); SDL_SetRenderDrawColor(renderer, 0, 0, 0, 0);
SDL_RenderClear(renderer); SDL_RenderClear(renderer);
@ -143,8 +152,6 @@ int main() {
} }
} }
} }
}
SDL_Quit();
// leaking memory, nothing I can do // leaking memory, nothing I can do
} }