Primer commit

paleta.cpp

@@ -0,0 +1,49 @@
+#include <SDL2/SDL.h>
+
+struct ARGB
+{
+    Uint8 b, g, r, a;
+};
+
+int main(int argc, char *argv[])
+{
+    SDL_Init(SDL_INIT_EVERYTHING);
+
+    SDL_Window *w = SDL_CreateWindow("pixels", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 640, 480, SDL_WINDOW_SHOWN);
+    SDL_Renderer *r = SDL_CreateRenderer(w, -1, 0);
+    SDL_RenderSetLogicalSize(r, 320, 240);
+    SDL_Texture *t = SDL_CreateTexture(r, SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_STREAMING, 320, 240);
+
+    ARGB *pixels;
+    int pitch;
+
+    SDL_Event sdlEvent;
+    bool exit = false;
+    while (!exit)
+    {
+        while (SDL_PollEvent(&sdlEvent))
+        {
+            if (sdlEvent.type == SDL_QUIT)
+            {
+                exit = true;
+                break;
+            }
+        }
+
+        SDL_LockTexture(t, nullptr, (void **)&pixels, &pitch);
+
+        for (int i = 0; i < 76800; ++i)
+        {
+            pixels[i].b = rand() % 256;
+            pixels[i].g = rand() % 256;
+            pixels[i].r = rand() % 256;
+            pixels[i].a = 255;
+        }
+
+        SDL_UnlockTexture(t);
+
+        SDL_RenderCopy(r, t, nullptr, nullptr);
+
+        SDL_RenderPresent(r);
+    }
+}