Restarting Post Processing for resolution change

Posted By: jumpman

Restarting Post Processing for resolution change - 11/14/17 04:08

Hello, im working on a simple post processing shader. I can get the PP to work correctly until the resolution changes. Ive searched on the forum for how to restart the chain, some of which say just to resize the render target bmap. But ive only seen ptr_remove used to destroy the bmap, and bmap_createblack again. But if I do this, the texture memory gets used up, almost as if ptr_remove isnt removing anything. How do I restart this post processing without stacking memory?

the simple chain

Code:

BMAP* g_buffer_scene;

VIEW* camMix = { layer = 2; }


function start_PP ()
{
	
	
g_buffer_scene = bmap_createblack(screen_size.x, screen_size.y, 24);  //screen_size.x, screen_size.y

camera->bmap = g_buffer_scene;

//	VIEW *camMix = view_create ( 2 );

   camMix->material = post_blood_pixel;	//pp_test_mine;	

	camMix->flags |= PROCESS_TARGET | SHOW;
	

camera->stage = camMix;
	
}

The attempt to remove the chain and free memory:

Code:

bmap_purge(g_buffer_scene);
   ptr_remove(g_buffer_scene);
   
   ptr_remove(camMix->material);
	ptr_remove(camMix->bmap);
	ptr_remove(camMix);

But memory isnt freed when I try to remove the chain. I want to remove it first, then i can attempt to restart it.

I just want to reapply the PP after the resolution changes.

Posted By: txesmi

Re: Restarting Post Processing for resolution change - 11/15/17 11:14

Hi,
I can't reproduce this issue in a blank level.

Code:

void resolutionChange () {
	camera->flags &= ~SHOW;
	camPP->flags &= ~SHOW;
	camera->stage = NULL;
	bmap_remove ( camera->bmap );
	camera->bmap = NULL;
	video_mode = video_switch ( video_mode+1, 32, 2 );
	if ( !video_mode )
		video_mode = video_switch ( 1, 32, 2 );
	// wait(1);
	camera->bmap = bmap_createblack ( screen_size.x, screen_size.y, 24 );
	camera->stage = camPP;
	camera->flags |= SHOW;
	camPP->flags |= SHOW;
}

Posted By: jumpman

Re: Restarting Post Processing for resolution change - 11/15/17 21:24

this works correctly! Thank you friend!

Though if I dont put a wait(-1); before and after the recreation, i get a DirectX error, cannot create texture unnamed. What is that?

Posted By: txesmi

Re: Restarting Post Processing for resolution change - 11/16/17 18:47

I don't really know. I am sorry. I guess it has something to do with the try of the GPU to access to a deleted buffer but no idea why and when could it happen. A resolution change is conflictive because everything has to be rebuilt from scratch after resizing the device backbuffers. I would try to avoid it as much as possible. Have you got more cameras around? Has any entity or material a rendertarget linked for shading?

You might try to set a larger bmap_zbuffer from the very beginning so the rendering target is not resized, just its viewport... I hope