World::Save spits out empty file.

[reepblue]

Note: Scene::Save() works fine but doesn't copy over component data. 

The current map doesn't load any components in this test, but it should be worth testing.

#include "UltraEngine.h"
using namespace UltraEngine;

void main(const char* args, const int argc)
{
    //Get the displays
    auto displays = GetDisplays();

    //Create a window
    auto window = CreateWindow("Ultra Engine", 0, 0, 1280, 720, displays[0], WINDOW_TITLEBAR | WINDOW_CENTER);

    //Create a framebuffer
    auto framebuffer = CreateFramebuffer(window);

    //Create a world
    auto world = CreateWorld();

    //Load a scene
    auto scene = LoadMap(world, "Maps/savetest.ultra");

    //Main loop
    while (!window->Closed() and !window->KeyHit(KEY_ESCAPE))
    {
        // Save 
        if (window->KeyHit(KEY_F5))
        {
            world->Save("save.ultra", SAVE_DEFAULT);
        }

        //Load
        if (window->KeyHit(KEY_F6))
        {
            scene = NULL;
            scene = LoadMap(world, "save.ultra");
        }

        //Update world
        world->Update();

        //Render world
        world->Render(framebuffer, true);
    }
}

 

savetest.zip

[Josh]

This method just creates a scene object and adds the world entities to it. However, the functionality to add all entities into a list of weak pointers was never added! The fastest fix is for me to just remove this method and the user can create a scene and add entities themselves.

[reepblue]

I hope this will be demonstrated in the documentation. I was under the impression we would have "snapshot" saves by default with the world/scene::Save() function. 

It probably only worked with Lua components, but I'm looking forward to an example.

[Josh]

Yeah, that's the idea. This appears to be working:

    auto p = CreatePivot(NULL);
    p->AddComponent<Mover>();

    auto map = std::make_shared<Scene>();
    map->AddEntity(p);

    map->Save("Maps/out.ultra");

Here is the output:
 

{
	"scene": {
		"base": [],
		"entities": [
			{
				"castShadows": false,
				"collisionType": 0,
				"extras": {
					"components": {
						"Mover": {
							"globalcoords": false,
							"movementspeed": [
								0,
								0,
								0
							],
							"rotationspeed": [
								0,
								0,
								0
							]
						}
					}
				},
				"pickMode": 0,
				"reflection": true,
				"uuid": "ffe028a9-4abe-49de-ba7b-30c2373cf196"
			}
		]
	}
}

 

[reepblue]

Ok, so can just for loop all the entities within the world, and then add it to the scene? I'll give it a try and play around with it. My goal is to have Half Life 2 like save/load states almost transparent to the end user.

Might want to do this for every save call since things like bullets or instanced objects can spawn at any time.

[reepblue]

Regarding components. they don't seem to get updated upon a reload and I have no idea why. This save file has the Mover and a CameraControls component defined in the map file but upon a reload, it's like the components aren't actually being attached for some reason. Does the editor do something different? 

 

quicksave.zip

[Josh]

Working on docs:
https://www.ultraengine.com/learn/Map_Reload?lang=cpp

[reepblue]

On 9/21/2023 at 5:25 PM, Josh said:

Working on docs:
https://www.ultraengine.com/learn/Map_Reload?lang=cpp

While this example works, it's not working in the way needed for game saves. The reload function throws an exception when trying to read a file and you get a bufferstream overflow with the example below. Also, since Reload doesn't create anything, would I need to load the map file before the save file? If so, what's the best way to know way to know what save file goes to which map?

#include "UltraEngine.h"

using namespace UltraEngine;

int main(int argc, const char* argv[])
{
    //Get the displays
    auto displays = GetDisplays();

    //Create a window
    auto window = CreateWindow("Ultra Engine", 0, 0, 1280, 720, displays[0], WINDOW_CENTER | WINDOW_TITLEBAR);

    //Create a world
    auto world = CreateWorld();

    //Create a framebuffer
    auto framebuffer = CreateFramebuffer(window);

    //Create a scene
    auto scene = LoadMap(world, "Maps/savetest.ultra");

    //Save the starting scene to memory
    shared_ptr<BufferStream> stream = NULL;
    shared_ptr<BufferStream> binstream = NULL;

    //Main loop
    while (window->Closed() == false and window->KeyDown(KEY_ESCAPE) == false)
    {
        if (window->KeyHit(KEY_F5))
        {
            Print("SAVE");
            if (stream) stream = NULL;
            if (binstream) binstream = NULL;
            stream = CreateBufferStream();
            binstream = CreateBufferStream();
            scene->Save(stream, binstream);
        }

        //Reload the starting scene when space key is pressed
        if (window->KeyHit(KEY_F6))
        {
            if (stream and binstream)
            {
                stream->Seek(0);
                binstream->Seek(0);
                scene->Reload(stream, binstream);
            }
        }

        world->Update();
        world->Render(framebuffer);
    }
    return 0;
}