update fade texture on window resize

1 files changed, 47 insertions, 18 deletions

diff --git a/src/sdl/main.c b/src/sdl/main.c
index 0d492a5..53f2377 100644
--- a/src/sdl/main.c
+++ b/src/sdl/main.c
@@ -47,6 +47,42 @@ load_font(
 }
 
 static void
+on_resize(
+  draw_ctx_t * const draw_ctx
+) {
+  if (draw_ctx->fade_tex) {
+    // free existing fade texture
+    SDL_DestroyTexture(draw_ctx->fade_tex);
+    draw_ctx->fade_tex = NULL;
+  }
+
+  // get window size
+  int w, h;
+  if (SDL_GetRendererOutputSize(draw_ctx->renderer, &w, &h)) {
+    die("SDL_GetRendererOutputSize(): %s", SDL_GetError());
+  }
+
+  // create fade texture
+  draw_ctx->fade_tex = SDL_CreateTexture(
+    draw_ctx->renderer,
+    SDL_PIXELFORMAT_RGBA32,
+    SDL_TEXTUREACCESS_TARGET,
+    w,
+    h
+  );
+
+  // check for error
+  if (!draw_ctx->fade_tex) {
+    die("SDL_CreateTexture(): %s", SDL_GetError());
+  }
+
+  // set fade texture blend mode
+  if (SDL_SetTextureBlendMode(draw_ctx->fade_tex, SDL_BLENDMODE_BLEND)) {
+    die("SDl_SetTextureBlendMode(): %s", SDL_GetError());
+  }
+}
+
+static void
 draw_to_fade_tex(
   draw_ctx_t * const draw_ctx
 ) {
@@ -229,26 +265,11 @@ int main(int argc, char *argv[]) {
     .theme      = theme_get_default(),
     .bump_ticks = SDL_GetTicks() - 5000,
     .fade_ticks = SDL_GetTicks() - 5000,
+    .fade_tex   = NULL,
   };
 
-  // create fade texture
-  draw_ctx.fade_tex = SDL_CreateTexture(
-    renderer,
-    SDL_PIXELFORMAT_RGBA32,
-    SDL_TEXTUREACCESS_TARGET,
-    WINDOW_WIDTH,
-    WINDOW_HEIGHT
-  );
-
-  // set fade texture blend mode
-  if (SDL_SetTextureBlendMode(draw_ctx.fade_tex, SDL_BLENDMODE_BLEND)) {
-    die("SDl_SetTextureBlendMode(): %s", SDL_GetError());
-  }
-
-  // check for error
-  if (!draw_ctx.fade_tex) {
-    die("SDL_CreateTexture(): %s", SDL_GetError());
-  }
+  // force resize (init fade texture)
+  on_resize(&draw_ctx);
 
   // set level
   set_level(&draw_ctx, &ctx, level_num);
@@ -379,6 +400,14 @@ int main(int argc, char *argv[]) {
         // toggle flag
         is_fullscreen = !is_fullscreen;
 
+        // handle resize
+        on_resize(&draw_ctx);
+
+        break;
+      case ACTION_RESIZE:
+        // handle resize
+        on_resize(&draw_ctx);
+
         break;
       case ACTION_SOLVE_CANCEL:
         SDL_Log("solve cancelled by user");