[Solved]Stencil buffer from freeglut and render to target.

[lvgeng]

Something I cannot understand well...

I included freeglut to use features of stencil buffer, while using irrlicht to draw. It works fine when rendering directly.
But when I add the render to target feature, strange thing happened.
It seems that stencil buffer test just doesn't work while rendering to target. (Because I can change the color of the area I was supposed to set stencil buffer) Any idea what is going on and how to fix it?



My code.

Code: Select all

#include <irrlicht.h>
#include <GL/freeglut.h>
using namespace irr;
using namespace core;
using namespace scene;
using namespace video;
using namespace io;
using namespace gui;
 
#ifdef _IRR_WINDOWS_
#pragma comment(lib, "Irrlicht.lib")
#pragma comment(linker, "/subsystem:windows /ENTRY:mainCRTStartup")
#endif
 
int main()
{
    IrrlichtDevice *device =
        createDevice(video::EDT_OPENGL, dimension2d<u32>(800, 600), 16,
            false, true, true, 0);
    if (!device)
        return 1;
    device->setWindowCaption(L"Hello World! - Irrlicht Engine Demo");
    IVideoDriver* driver = device->getVideoDriver();
    ISceneManager* smgr = device->getSceneManager();
    IGUIEnvironment* guienv = device->getGUIEnvironment();
 
    IAnimatedMesh* mesh = smgr->getMesh("../media/f14/f14d.obj");
    if (!mesh)
    {
        device->drop();
        return 1;
    }
    IAnimatedMeshSceneNode* node = smgr->addAnimatedMeshSceneNode(mesh);
 
    if (node)
    {
        node->setMaterialFlag(EMF_LIGHTING, true);
        node->setMaterialFlag(video::EMF_NORMALIZE_NORMALS, true);
 
        node->setScale(core::vector3df(3,3,3));
        node->setRotation(core::vector3df(0,135,0));
    }
 
    smgr->addLightSceneNode(0, core::vector3df(2000, 2000, 2000), video::SColorf(1.0f, 1.0f, 1.0f), 20000);
    smgr->addLightSceneNode(0, core::vector3df(2000, 2000, -2000), video::SColorf(1.0f, 1.0f, 1.0f), 20000);
    smgr->setAmbientLight(video::SColorf(0.3f, 0.3f, 0.3f));
 
    scene::ICameraSceneNode* currentCamera = smgr->addCameraSceneNodeFPS();
    currentCamera->setFarValue(20000.f);
    currentCamera->setPosition(core::vector3df(0, 0, -70));
    currentCamera->setTarget(core::vector3df(0, 30, 0));
 
    //===============================================
    video::ITexture* rt = 0;
    rt = driver->addRenderTargetTexture(core::dimension2d<u32>(800, 600), "RTT1");  
    // add fixed camera
    
 
 
    while (device->run())
    {
        //driver->beginScene(true, true, SColor(255, 100, 101, 140));
        driver->setRenderTarget(rt, true, true, SColor(255, 100, 101, 140));
        
        glClearStencil(0);
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
        glMatrixMode(GL_MODELVIEW);
        glLoadIdentity();
        glEnable(GL_STENCIL_TEST);
 
        glStencilFunc(GL_NEVER, 0x1, 0x1);
        glStencilOp(GL_REPLACE, GL_REPLACE, GL_REPLACE);
 
        driver->draw2DRectangle(
            video::SColor(255, 255, 0, 0),
            core::rect<s32>(0,0,400,600)
            );
 
        glStencilFunc(GL_EQUAL, 0x1, 0x1);
        glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
 
        smgr->drawAll();
        
        driver->setRenderTarget(0, true, true, 0);
 
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
        glDisable(GL_STENCIL_TEST);
        driver->draw2DImage(rt, core::position2d<s32>(10, 10),
            core::rect<s32>(0, 0, 800, 600), 0,
            video::SColor(255, 255, 255, 255), true);
 
 
        guienv->drawAll();
        driver->endScene();
    }
    device->drop();
    return 0;
}

=========================================================================
Solution: Use the trunk rather than the release version.

=========================================================================

[hendu]

RTTs do not have a stencil attachment by default. You can enable this either in shader-pipeline or my fork.

[lvgeng]

RTTs do not have a stencil attachment by default. You can enable this either in shader-pipeline or my fork.

Er... would you mind to give some more detailed advice? I can still understand shader-pipeline(although without knowing what to do exactly), bit I have no idea about 'my fork'. Would you kindly give me some advices?

[lvgeng]

RTTs do not have a stencil attachment by default. You can enable this either in shader-pipeline or my fork.

http://irrlicht.sourceforge.net/forum/v ... =2&t=50294

According to the discussion it seems that the support for stencil buffer have been added. Does it means that actually I can render plenty of different stencil buffer and then use them later? And another problem is that I am not so sure which part is for shader... it seems that I am using the default shader. I modified the helloworld example to my project, how can I access the shader control?

[hendu]

My fork of irr is here:
https://github.com/clbr/seirr/tree/shipping

In it, you would add "true" to the end of your addRenderTargetTexture call. I haven't used the new interface in shader-pipeline (or trunk, I guess). Stencil and depth are shared between all RTTs, if you want separate ones you'll need to use the new interface on very latest irr.

[lvgeng]

My fork of irr is here:
https://github.com/clbr/seirr/tree/shipping

In it, you would add "true" to the end of your addRenderTargetTexture call. I haven't used the new interface in shader-pipeline (or trunk, I guess). Stencil and depth are shared between all RTTs, if you want separate ones you'll need to use the new interface on very latest irr.

Thank you I will check. Currently I am using 1.8.3, is that late enough...? Or I should pull from the repository for beta version?
PS: about the link you gave... how to use it?
Replace the old ones in the source code of irrlicht and then compile the source code for .dll and .lib (and .a for linux?)?

[Nadro]

@lvgeng
In trunk stencil textures for render targets are available too -> ECF_D24S8. You can check example no. 13 in trunk for more details.

[lvgeng]

@lvgeng
In trunk stencil textures for render targets are available too -> ECF_D24S8. You can check example no. 13 in trunk for more details.

Just one problem.... how to get trunk?
I found this: http://irrlicht.sourceforge.net/forum/v ... =1&t=47538

But it's a relatively long time ago. Just in case, is that what I should do to get trunk? From that SVN repository?

[CuteAlien]

You need a svn client (tortoise svn on Windows, on Linux install some subversion package). Then you can download it from svn://svn.code.sf.net/p/irrlicht/code/trunk

(so address has changed a little bit since the last post, otherwise it's the same).

[mongoose7]

Well, the link is not working now, but from memory you can download a ZIP file without needing a SVN client.