84 lines
2.2 KiB
C++
84 lines
2.2 KiB
C++
#include <SDL3/SDL.h>
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#include <cmath>
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int main(int argc, char *argv[])
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{
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SDL_Init(SDL_INIT_VIDEO | SDL_INIT_EVENTS);
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constexpr int WIDTH = 160;
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constexpr int HEIGHT = 160;
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constexpr int SIZE = WIDTH * HEIGHT;
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constexpr int ZOOM = 4;
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SDL_Window *window = SDL_CreateWindow("pixels", WIDTH * ZOOM, HEIGHT * ZOOM, SDL_WINDOW_OPENGL);
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SDL_Renderer *renderer = SDL_CreateRenderer(window, nullptr);
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SDL_SetRenderLogicalPresentation(renderer, WIDTH, HEIGHT, SDL_LOGICAL_PRESENTATION_INTEGER_SCALE);
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SDL_Texture *texture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_STREAMING, WIDTH, HEIGHT);
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Uint32 *pixels;
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int pitch;
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int rad = 96;
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int dx = (WIDTH - (rad * 2)) / 2;
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int dy = (HEIGHT - (rad * 2)) / 2;
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Uint8 surface[SIZE];
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Uint32 paleta[2];
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paleta[0] = 0xFF000000;
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paleta[1] = 0xFFFFFFFF;
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SDL_Event sdlEvent;
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bool exit = false;
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while (!exit)
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{
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while (SDL_PollEvent(&sdlEvent))
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{
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if (sdlEvent.type == SDL_EVENT_QUIT)
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{
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exit = true;
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break;
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}
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}
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SDL_LockTexture(texture, nullptr, (void **)&pixels, &pitch);
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// Limpia la surface
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for (int i = 0; i < SIZE; ++i)
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{
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surface[i] = 0;
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}
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// Dibuja el efecto
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float time = SDL_GetTicks() / 1000.0f;
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for (int j = -rad; j <= rad; j += 3)
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for (int i = -rad; i <= rad; i += 2)
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{
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float dist = sqrt(i * i + j * j);
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float z = cos((dist / 40 - time) * M_PI * 2) * 6;
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const int x = rad + i + dx;
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const int y = rad + j - z + dy;
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if (x < WIDTH && y < HEIGHT && x >= 0 && y >= 0)
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surface[x + y * WIDTH] = 1;
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}
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// Vuelca la surface a la textura
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for (int i = 0; i < SIZE; ++i)
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{
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pixels[i] = paleta[surface[i]];
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}
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SDL_UnlockTexture(texture);
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SDL_RenderTexture(renderer, texture, nullptr, nullptr);
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SDL_RenderPresent(renderer);
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}
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SDL_DestroyTexture(texture);
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SDL_DestroyRenderer(renderer);
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SDL_DestroyWindow(window);
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SDL_Quit();
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return 0;
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} |