SDL3 - SDL_CreateTextureFromSurface

SDL Development
1

For some reason, I cant get the textures returned by this function to render. It either renders nothing or a white rectangle. If I manually create a texture and use SDL_UpdateTexture this renders fine. SDL_CreateTextureFromSurface does not return an error and the white rectangle that sometimes does get rendered is at least the right size. The video driver is DirectX 11 and Windows 10.

2

Please provide a Minimal Reproducible Example (MRE) so we can try to reproduce your problem.
Thanks!

3

Ok, here is some code that currently fails. image will render fine but not texture.

SDL_Texture *image = LoadTexture("assets/c64.png");
SDL_RenderClear(renderer);
SDL_RenderTexture(renderer, image, NULL, NULL);

SDL_Surface *surface = SDL_RenderReadPixels(renderer, NULL);
SDL_Texture *texture = SDL_CreateTextureFromSurface(renderer, surface);
SDL_DestroySurface(surface);


while (1) {
    HandleEvents();
    SDL_RenderClear(renderer);
    SDL_RenderTexture(renderer, texture, NULL, NULL);
    SDL_RenderPresent(renderer);
}
4

Next time, please provide full source code. Code which can be passed to the compiler unchanged.

I adapted your code slightly (loading a bmp instead of a png), and it appears to work fine?

#define SDL_ASSERT_LEVEL 2
#include <SDL3/SDL.h>

int main(int argc, char *argv[]) {
    SDL_assert(SDL_Init(SDL_INIT_VIDEO));
    SDL_Window *window;
    SDL_Renderer *renderer;
    if (argc < 2) {
        SDL_Log("Need an argument");
        return 1;
    }
    SDL_Surface *image_surface = SDL_LoadBMP(argv[1]);
    if (!image_surface) {
        SDL_Log("Failed to load %s (%s)", argv[1]);
        SDL_Quit();
        return 1;
    }
    SDL_assert(SDL_CreateWindowAndRenderer("title", 640, 480, 0, &window, &renderer));
    SDL_Texture *image_texture = SDL_CreateTextureFromSurface(renderer, image_surface);
    SDL_assert(image_texture);
    SDL_DestroySurface(image_surface);
    SDL_assert(SDL_RenderClear(renderer));
    SDL_assert(SDL_RenderTexture(renderer, image_texture, NULL, NULL));
    SDL_DestroyTexture(image_texture);

    SDL_Surface *surface_read = SDL_RenderReadPixels(renderer, NULL);
    SDL_assert(surface_read);
    SDL_Texture *texture_read = SDL_CreateTextureFromSurface(renderer, surface_read);
    SDL_assert(texture_read);
    SDL_DestroySurface(surface_read);

    while (1) {
        SDL_Event e;
        while (SDL_PollEvent(&e)) {
            if (e.type == SDL_EVENT_QUIT) {
                goto finish;
            }
        }
        SDL_assert(SDL_RenderClear(renderer));
        SDL_assert(SDL_RenderTexture(renderer, texture_read, NULL, NULL));
        SDL_assert(SDL_RenderPresent(renderer));
    }
finish:
    SDL_DestroyTexture(texture_read);
    SDL_DestroyRenderer(renderer);
    SDL_DestroyWindow(window);
    SDL_Quit();
    return 0;
}
5

I still just get a black screen. It was working before in an older version so I just replaced the function with the older version recompiled it and it worked. Then I used WinMerge to compare the differences it showed that the only difference with the older version that works is a single line:

This is from the version that shows the image okay:
texture_colorspace = SDL_GetSurfaceColorspace(surface);

And this is from the lastest code that iis only showing a black screen for me:
surface_colorspace = SDL_GetSurfaceColorspace(surface);

6

Can you please report this as a bug on GitHub?

Please include the code you have here as well as the asset that’s failing and your LoadTexture() implementation.

Thanks!