Change TEXTURE_ACCESS from TARGET to STREAMING

Hey,
I need to change the TEXTURE_ACCESS of some textures from TARGET to STREAMING, because i want to access and change individual pixels. My best guess was to use SDL_RenderReadPixels of my TARGET-texture and write the pixel data into a new STREAMING-texture, but the resulting STREAMING-texture is flipped upside-down and i don't really know why that happens (maybe because open_gl has it's origin in the bottom-left and not top-left?) and how to fix it...
My code looks like this:

Code:

SDL_Texture* targetTexture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_RGBA8888, SDL_TEXTUREACCESS_TARGET, width, height);
SDL_SetRenderTarget(renderer, targetTexture);
//render some things onto targetTexture
SDL_Texture* streamingTexture = SDL_CreateTexture( renderer, SDL_PIXELFORMAT_RGBA8888, SDL_TEXTUREACCESS_STREAMING, width, height );
void* streamingPixels;
int streamingPitch;
SDL_LockTexture( streamingTexture, NULL, &streamingPixels, &streamingPitch );
SDL_RenderReadPixels(renderer, NULL, SDL_PIXELFORMAT_RGBA8888, streamingPixels, streamingPitch);
SDL_UnlockTexture( streamingTexture );
SDL_SetRenderTarget(renderer, NULL);




Any help is appreciated :)

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