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Bug 4204 - SDL_GetRenderTarget does not return the same texture as SDL_SetRenderTarget
Summary: SDL_GetRenderTarget does not return the same texture as SDL_SetRenderTarget
Status: RESOLVED INVALID
Alias: None
Product: SDL
Classification: Unclassified
Component: render (show other bugs)
Version: 2.0.4
Hardware: x86_64 Linux
: P2 normal
Assignee: Sam Lantinga
QA Contact: Sam Lantinga
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2018-06-20 06:48 UTC by Adam Bryant
Modified: 2019-06-10 18:44 UTC (History)
1 user (show)

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Description Adam Bryant 2018-06-20 06:48:54 UTC 
In this sample code:

#include <iostream>
#include <SDL2/SDL.h>
#include <thread>

int main() {
    SDL_Window *window = NULL;
    SDL_Renderer *renderer = NULL;
    SDL_CreateWindowAndRenderer(1, 1, 0, &window, &renderer);

    SDL_Texture *texture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_RGBA8888, SDL_TEXTUREACCESS_STATIC, 1, 1);
    SDL_SetRenderTarget(renderer, texture);
    SDL_Texture *renderTexture = SDL_GetRenderTarget(renderer);

    if (renderTexture != texture) {
        throw std::runtime_error("What?");
    }
    std::this_thread::sleep_for(std::chrono::seconds(1));
    return 0;
}

the exception is thrown.

Is SDL_GetRenderTarget returning a different address expected behavior?
Comment 1 Sam Lantinga 2018-06-22 17:45:29 UTC 
Yes, this is expected if you're using a texture format that isn't supported by the renderer.

Try using SDL_PIXELFORMAT_ARGB8888 instead if you don't want texture conversion.
Comment 2 Adam Bryant 2018-06-22 21:17:25 UTC 
(In reply to Sam Lantinga from comment #1)
> Yes, this is expected if you're using a texture format that isn't supported
> by the renderer.
> 
> Try using SDL_PIXELFORMAT_ARGB8888 instead if you don't want texture
> conversion.

Thanks, it works now.
I changed my code around to select a supported format.
Comment 3 Martin Vee 2019-06-10 18:44:46 UTC 
This behaviour should be described in the wiki, as it's a bit unexpected to have a "getter" returning a different value than the "setter".

Is it possible to query a `texture->native` pointer to get it's parent `texture` pointer?