无法在SDL中使用低图形

Question

当我缩放窗口时，SDL 只是忽略我设置的分辨率并在像素上绘制对角线。 这是 SDL2，我使用

SDL_RenderGeometry

来绘制三角形。

这是我创建窗口的方法：

static inline void canvas_init(Canvas* canvas) {
  SDL_CreateWindowAndRenderer(canvas->width * canvas->scale_x, canvas->height * canvas->scale_y, 0, &(canvas->window), &(canvas->renderer));
  SDL_RenderSetScale(canvas->renderer, canvas->scale_x, canvas->scale_y);
  SDL_Init(SDL_INIT_VIDEO);
}

我尝试了一些创建后备缓冲区的方法，但我可能做错了，而且它无法正常工作。

这是我目前在应该有 10 像素的窗口上得到的结果

Answer 1

谢谢你的评论，这样做就可以了

创建一个低分辨率纹理，绘制它，但在显示它之前，将其复制到窗口纹理

static inline void canvas_init(Canvas* canvas) {
  SDL_CreateWindowAndRenderer(canvas->width * canvas->scale_x, canvas->height * canvas->scale_y, SDL_WINDOW_ALWAYS_ON_TOP, &(canvas->window), &(canvas->renderer));
  canvas->texture = SDL_CreateTexture(canvas->renderer, SDL_PIXELFORMAT_RGBA8888, SDL_TEXTUREACCESS_TARGET, canvas->width, canvas->height);
  SDL_Init(SDL_INIT_EVERYTHING);
}

static inline void canvas_update(Canvas canvas, uint16_t delay) {
  SDL_SetRenderTarget(canvas.renderer, NULL);
  SDL_RenderCopy(canvas.renderer, canvas.texture, NULL, NULL);
  canvas_display(canvas);

  SDL_SetRenderTarget(canvas.renderer, canvas.texture);
  canvas_color(canvas, (Color) {0, 0, 0, 255});
  canvas_clear(canvas);

  canvas_delay(delay);
}