[rtextures] Load cubemap mipmaps

src/rtextures.c

@@ -4201,6 +4201,9 @@ TextureCubemap LoadTextureCubemap(Image image, int layout)
             faces = GenImageColor(size, size*6, MAGENTA);
             ImageFormat(&faces, image.format);
 
+            ImageMipmaps(&image);
+            ImageMipmaps(&faces);
+
             // NOTE: Image formatting does not work with compressed textures
 
             for (int i = 0; i < 6; i++) ImageDraw(&faces, image, faceRecs[i], (Rectangle){ 0, (float)size*i, (float)size, (float)size }, WHITE);