aaara si, makes, cmakes i gitignores com toca

source/demo1_pixels_wave.cpp

@@ -0,0 +1,83 @@
+#define _USE_MATH_DEFINES
+#include <SDL3/SDL.h>
+#include <cmath>
+
+int main(int argc, char *argv[])
+{
+    SDL_Init(SDL_INIT_VIDEO | SDL_INIT_EVENTS);
+
+    constexpr int WIDTH = 160;
+    constexpr int HEIGHT = 160;
+    constexpr int SIZE = WIDTH * HEIGHT;
+    constexpr int ZOOM = 4;
+
+    SDL_Window *window = SDL_CreateWindow("pixels", WIDTH * ZOOM, HEIGHT * ZOOM, SDL_WINDOW_OPENGL);
+    SDL_Renderer *renderer = SDL_CreateRenderer(window, nullptr);
+    SDL_SetRenderLogicalPresentation(renderer, WIDTH, HEIGHT, SDL_LOGICAL_PRESENTATION_INTEGER_SCALE);
+    SDL_Texture *texture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_STREAMING, WIDTH, HEIGHT);
+
+    Uint32 *pixels;
+    int pitch;
+    int rad = 96;
+    int dx = (WIDTH - (rad * 2)) / 2;
+    int dy = (HEIGHT - (rad * 2)) / 2;
+
+    Uint8 surface[SIZE];
+    Uint32 paleta[2];
+
+    paleta[0] = 0xFF000000;
+    paleta[1] = 0xFFFFFFFF;
+
+    SDL_Event sdlEvent;
+    bool exit = false;
+    while (!exit)
+    {
+        while (SDL_PollEvent(&sdlEvent))
+        {
+            if (sdlEvent.type == SDL_EVENT_QUIT)
+            {
+                exit = true;
+                break;
+            }
+        }
+
+        SDL_LockTexture(texture, nullptr, (void **)&pixels, &pitch);
+
+        // Limpia la surface
+        for (int i = 0; i < SIZE; ++i)
+        {
+            surface[i] = 0;
+        }
+
+        // Dibuja el efecto
+        float time = SDL_GetTicks() / 1000.0f;
+        for (int j = -rad; j <= rad; j += 3)
+            for (int i = -rad; i <= rad; i += 2)
+            {
+                float dist = sqrt(i * i + j * j);
+                float z = cos((dist / 40 - time) * M_PI * 2) * 6;
+                const int X = rad + i + dx;
+                const int Y = rad + j - z + dy;
+                if (X < WIDTH && Y < HEIGHT && X >= 0 && Y >= 0)
+                    surface[X + Y * WIDTH] = 1;
+            }
+
+        // Vuelca la surface a la textura
+        for (int i = 0; i < SIZE; ++i)
+        {
+            pixels[i] = paleta[surface[i]];
+        }
+
+        SDL_UnlockTexture(texture);
+        SDL_RenderTexture(renderer, texture, nullptr, nullptr);
+        SDL_RenderPresent(renderer);
+    }
+    
+    SDL_DestroyTexture(texture);
+    SDL_DestroyRenderer(renderer);
+    SDL_DestroyWindow(window);
+
+    SDL_Quit();
+
+    return 0;
+}