从几个纹理创建新纹理 SDL-2。

Question

从几个纹理创建新纹理 SDL-2。

5

我有几个纹理需要在屏幕上保持不动。与其每次渲染时单独渲染它们，我想将它们全部作为一个纹理渲染。到目前为止，我的代码看起来像这样：

SDL_Texture* target_texture = NULL;
SDL_SetRenderTarget(renderer, target_texture);
SDL_RenderCopy(renderer, texture1, NULL, &dst1);
SDL_RenderCopy(renderer, texture2, NULL, &dst2);
SDL_RenderCopy(renderer, texture3, NULL, &dst3);
.
.
.
SDL_SetRenderTarget(renderer, NULL);
SDL_RendererPresent(renderer);
// Here the screen displays as I want
SDL_Delay(2000);
SDL_RenderClear(renderer);
SDL_RenderCopy(renderer, target_texture, NULL, NULL);
SDL_RendererPresent(renderer);
// Here the screen is black as though target_texture is still NULL

- Ben McAlindin

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- gabomdq · Accepted Answer

您需要创建目标纹理，当前它始终为NULL。将第一行替换为：

target_texture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_RGBA8888, SDL_TEXTUREACCESS_TARGET, target_width, target_height);