Read texture with c++ SDL2_image on Android

SDL Development
1

Hi, I’m trying to understand how to use the assets files of an APK from SDL2 ,here is what i want to do: load a texture from assets/background.jpg, render it on each loop.
I’ve put the texture in the assets dir, I can see it when the apk is generated using an extractor, so it’s good to go, but the file can’t be read from the SDL_image function to do so…
Code:

 SDL_Texture *img = NULL;
	int w, h; // texture width & height
        //later in the code
	if (img == NULL) {
  	        // load our image
		img = IMG_LoadTexture(state->renderers[0], "background.jpg");

		if (img != NULL)
		{
			SDL_Log("Image loaded ok -background.jpg-");
		}
		else
		{
			SDL_Log("Could not load the background.jpg");
		}
	}

I’m always getting the "Could not load the background.jpg , do I need to add permises to the AndroidManifest?, should i be using AssetManager from a JNI bridge from Java?
like this:
http://www.concretepage.com/android/android-assetmanager-example-to-load-image-from-assets-folder
?
or maybe my sdl2_image library is not compiled ok, since i had to make my own .so version with VStudio2017 and the sources…

2

first of of all, print the error message with SDL_GetError()

3

Thanks , the problem was that i was not using the flags USE_JPG when compiling the SDL2_image libraries, now it loads the image with a renderer, but i can’t see the image on the screen :thinking:
What I do in main.cpp is:
add the include
#include "SDL_image.h"
then init just the jpg:

int flags = IMG_INIT_JPG;// | IMG_INIT_PNG;
if (IMG_Init(flags) != flags)
{
	SDL_Log("Could not initialize IMG JPG");
	SDL_Log("IMG Load error: %s", SDL_GetError());
}

create the renderer:
SDL_Renderer *imgRenderer = SDL_CreateRenderer(state->windows[0], -1, SDL_RENDERER_ACCELERATED);
then ,load the image:

            SDL_Texture *img = IMG_LoadTexture(imgRenderer, "background.jpg");
            int w,h;
            if (img != NULL)
		    {
			SDL_Log("Image loaded ok %s\n", "background.jpg");
			SDL_QueryTexture(img, NULL, NULL, &w, &h);
			texr.x = w/2; texr.y = h/2; texr.w = w; texr.h = h;
		   }
		   else
		   {
			SDL_Log("Error loading Image: %s\n", "background.jpg");
			SDL_Log("SDL Error: %s", SDL_GetError());
		   }

finally, render it
SDL_RenderCopy(imgRenderer, img, NULL, &texr);
SDL_GL_SwapWindow(state->windows[i]);

full code

so,what am i missing? like i said, the image is being loaded…
log:

08-27 14:22:13.054: I/SDL/APP(9070): Trying to load the image…
08-27 14:22:13.054: V/SDL(9070): onWindowFocusChanged(): true
08-27 14:22:13.384: I/SDL/APP(9070): Image loaded ok background.jpg

thanks!

4

Try using SDL_RenderPresent() instead of SDL_GL_SwapWindow()

5

That didn’t work…
Maybe I need to draw it I a different way for gles2?

6

what’s the size of your image?
can you try without the texr?
SDL_RenderCopy(imgRenderer, img, NULL, NULL);

7

i fixed it, thanks for the help Sanette