neop/randomwalk
neop/randomwalk
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simple surface drawing

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This commit is contained in:
Jakob Hördt 2024-08-03 23:38:19 +02:00
parent 39feecded0
commit d521c06c34
1 changed files with 19 additions and 13 deletions
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32
main.cpp
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@ -2,13 +2,9 @@
#include <SDL2/SDL.h>
#include <algorithm>
#include <chrono>
#include <functional>
#include <memory>
#include <print>
#include <random>
#include <vector>
template <typename SDLT, auto deletef>
struct sdl_wrapper_t : std::unique_ptr<SDLT, decltype(deletef)> {
@ -73,6 +69,13 @@ int main() {
auto* window_surface = SDL_GetWindowSurface(window);
if (!window_surface) { return EXIT_FAILURE; }
if (window_surface->format->palette) { return EXIT_FAILURE; }
std::println(
"got surface with {} bits per pixel",
window_surface->format->BitsPerPixel
);
if (!(window_surface->format->format & SDL_PIXELFORMAT_RGBA32)) {
return EXIT_FAILURE;
}
SDL_Point pos{.x = width / 2, .y = height / 2};
const SDL_Point directions[] = {
@ -81,17 +84,20 @@ int main() {
std::mt19937_64 rne(std::random_device{}());
std::uniform_int_distribution dist(0, 3);
// aarrggbb??
constexpr Uint32 walk_color = 0xff00ff00;
for (bool continu = true; continu;) {
{
SDL_Point newpoint;
do {
newpoint = pos + directions[dist(rne)];
} while (newpoint.x < 0 or newpoint.x >= width or newpoint.y < 0 or
newpoint.y >= height);
pos = newpoint;
}
SDL_Point newpoint;
do {
newpoint = pos + directions[dist(rne)];
} while (newpoint.x < 0 or newpoint.x >= width or newpoint.y < 0 or
newpoint.y >= height);
pos = newpoint;
SDL_LockSurface(window_surface);
static_cast<Uint32*>(window_surface->pixels
)[pos.x + pos.y * window_surface->h] = walk_color;
SDL_UnlockSurface(window_surface);
for (SDL_Event e; SDL_PollEvent(&e);) {
if (e.type == SDL_QUIT) { continu = false; }