Set up initial rendering

compile_commands.json

@@ -77,11 +77,11 @@
       "-x",
       "c",
       "-o",
-      "/tmp/main-b9c948.o",
+      "/tmp/main-7469c3.o",
       "main.c"
     ],
     "directory": "/home/abdelrahman/Sources/programming/starfield",
     "file": "/home/abdelrahman/Sources/programming/starfield/main.c",
-    "output": "/tmp/main-b9c948.o"
+    "output": "/tmp/main-7469c3.o"
   }
 ]

main.c

@@ -0,0 +1,90 @@
+#include <SDL2/SDL.h>
+#include <SDL2/SDL_pixels.h>
+#include <SDL2/SDL_rect.h>
+#include <SDL2/SDL_render.h>
+#include <SDL2/SDL_surface.h>
+#include <SDL2/SDL_video.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define WINDOW_WIDTH 800
+#define WINDOW_HEIGHT 600
+
+#define BG_COLOR 0x060616ff
+
+void render_clear(SDL_Surface *surface, uint32_t color);
+void fill_rect(SDL_Surface *surface, uint32_t x, uint32_t y, uint32_t w,
+               uint32_t h, uint32_t color);
+
+int main(void) {
+  SDL_Init(SDL_INIT_EVERYTHING);
+
+  SDL_Window *window = SDL_CreateWindow("Starfield", SDL_WINDOWPOS_CENTERED,
+                                        SDL_WINDOWPOS_CENTERED, WINDOW_WIDTH,
+                                        WINDOW_HEIGHT, SDL_WINDOW_SHOWN);
+
+  SDL_Surface *surface = SDL_GetWindowSurface(window);
+
+  SDL_Surface *canvas = SDL_CreateRGBSurfaceWithFormat(
+      0, surface->w, surface->h, 32, SDL_PIXELFORMAT_ABGR32);
+
+  bool running = true;
+
+  SDL_Event event = {0};
+
+  while (running) {
+    while (SDL_PollEvent(&event)) {
+      switch (event.type) {
+      case SDL_QUIT:
+        running = false;
+        break;
+      }
+    }
+
+    render_clear(canvas, BG_COLOR);
+
+    SDL_BlitSurface(canvas, NULL, surface, NULL);
+
+    SDL_UpdateWindowSurface(window);
+  }
+
+  SDL_DestroyWindow(window);
+
+  SDL_Quit();
+
+  return EXIT_SUCCESS;
+}
+
+void render_clear(SDL_Surface *surface, uint32_t color) {
+  uint32_t length = surface->w * surface->h;
+
+  SDL_LockSurface(surface);
+
+  uint32_t *pixels = (uint32_t *)(surface->pixels);
+
+  for (uint32_t i = 0; i < length; ++i) {
+    pixels[i] = color;
+  }
+
+  SDL_UnlockSurface(surface);
+}
+
+void fill_rect(SDL_Surface *surface, uint32_t x, uint32_t y, uint32_t w,
+               uint32_t h, uint32_t color) {
+  SDL_LockSurface(surface);
+
+  uint32_t *pixels = (uint32_t *)(surface->pixels);
+
+  for (uint32_t row = 0; row < h; ++row) {
+    for (uint32_t col = 0; col < w; ++col) {
+      uint32_t i = (y + row) * surface->w + (x + col);
+
+      pixels[i] = color;
+    }
+  }
+
+  SDL_UnlockSurface(surface);
+}