Function SDL_CreateWindowTexture

deps/SDL2/src/video/SDL_video.c:258–366

}

static int
SDL_CreateWindowTexture(SDL_VideoDevice *unused, SDL_Window * window, Uint32 * format, void ** pixels, int *pitch)
{
    SDL_WindowTextureData *data;

    data = SDL_GetWindowData(window, SDL_WINDOWTEXTUREDATA);
    if (!data) {
        SDL_Renderer *renderer = NULL;
        int i;
        const char *hint = SDL_GetHint(SDL_HINT_FRAMEBUFFER_ACCELERATION);

        /* Check to see if there's a specific driver requested */
        if (hint && *hint != '0' && *hint != '1' &&
            SDL_strcasecmp(hint, "true") != 0 &&
            SDL_strcasecmp(hint, "false") != 0 &&
            SDL_strcasecmp(hint, "software") != 0) {
            for (i = 0; i < SDL_GetNumRenderDrivers(); ++i) {
                SDL_RendererInfo info;
                SDL_GetRenderDriverInfo(i, &info);
                if (SDL_strcasecmp(info.name, hint) == 0) {
                    renderer = SDL_CreateRenderer(window, i, 0);
                    break;
                }
            }
        }
        
        if (!renderer) {
            for (i = 0; i < SDL_GetNumRenderDrivers(); ++i) {
                SDL_RendererInfo info;
                SDL_GetRenderDriverInfo(i, &info);
                if (SDL_strcmp(info.name, "software") != 0) {
                    renderer = SDL_CreateRenderer(window, i, 0);
                    if (renderer) {
                        break;
                    }
                }
            }
        }
        if (!renderer) {
            return SDL_SetError("No hardware accelerated renderers available");
        }

        /* Create the data after we successfully create the renderer (bug #1116) */
        data = (SDL_WindowTextureData *)SDL_calloc(1, sizeof(*data));
        if (!data) {
            SDL_DestroyRenderer(renderer);
            return SDL_OutOfMemory();
        }
        SDL_SetWindowData(window, SDL_WINDOWTEXTUREDATA, data);

        data->renderer = renderer;
    }

    /* Free any old texture and pixel data */
    if (data->texture) {
        SDL_DestroyTexture(data->texture);
        data->texture = NULL;
    }