Re: FxPlug OpenGL render FBO object to motion's FBO

Subject: Re: FxPlug OpenGL render FBO object to motion's FBO
From: Ardo Avancena <email@hidden>
Date: Mon, 21 Oct 2013 11:19:30 -0700

Hi Darrin,

Sorry about not being able to post my code since I am new to this there is a lot of comments, so I had to clean it up but here is what my code is:

This is when I create a new fbo, I was following a tutorial that's why its named as such.
This is called on every render thats why I encapsulated it in an if statement

if(fboTutorial == 0){


    glGenFramebuffers(1, &fboTutorial);
    glBindFramebuffer(GL_FRAMEBUFFER, fboTutorial);

    glGenTextures(1, &rtTutorial);
    glBindTexture(GL_TEXTURE_2D, rtTutorial);

    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 1920, 1080, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);

    glGenRenderbuffers(1, &dbTutorial);
    glBindRenderbuffer(GL_RENDERBUFFER, dbTutorial);
    glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT, 1920, 1080);
    glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, dbTutorial);

        glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, rtTutorial, 0);
    drawTutorial[0] = GL_COLOR_ATTACHMENT0;
    drawTutorial[1] = GL_DEPTH_ATTACHMENT;
    glDrawBuffers(2, drawTutorial);

    if(glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)
    {
        NSLog(@"incomplete frame buffer");
    }else{
        NSLog(@"complete framebuffer");
    }

}
    glBindFramebuffer(GL_FRAMEBUFFER,currentFBO);

Then when im going to draw to the fbo:

    GLint motionFB;
    glGetIntegerv(GL_FRAMEBUFFER_BINDING, &motionFB);

    glBindFramebuffer(GL_FRAMEBUFFER, fboTutorial);
    if(glCheckFramebufferStatus(GL_FRAMEBUFFER) == GL_FRAMEBUFFER_COMPLETE){
        NSLog(@"first time binding GOOD");
    }else{
        NSLog(@"first time binding bad");
        NSLog(@"fbo error %u",glCheckFramebufferStatus(GL_FRAMEBUFFER));
    }

////drawing codes here for fbo

glFlush();

//Return to motion's fbo
glBindFramebuffer(GL_FRAMEBUFFER, motionFB);

//First attempt at implementing the pseudo code,

glActiveTexture(rtTutorial);
glActiveTexture(GL_TEXTURE_2D);

//Then I tried this in place of the above code but only showed what I drew for motion
        glActiveTexture(GL_TEXTURE0);
    glEnable(GL_TEXTURE_2D);
    glBindTexture(GL_TEXTURE0, rtTutorial);

glClear(GL_COLOR_BUFFER_BIT);
glViewport(0, 0, 1920, 1080);

//////drawing codes for motion

glFlush();

This is pretty much the code I have related to the fbo and drawing to either motion and fbo. Thanks

Peter,

I didnt set anything about the depth range yet, but ill try and play around with it too. Thanks

On Mon, Oct 21, 2013 at 11:00 AM, Peter Litwinowicz <email@hidden> wrote:

In addition to Darrin's comments, you might consider that there is a z-buffer issue? Just thinking because your result looks like a perhaps there is (inappropriate, or unwantned) clipping going on, or that there is a z-buffer state of some sort causing all the pixels to not be drawn.

Pete

From: Darrin Cardani <email@hidden>
Date: Monday, October 21, 2013 10:44 AM
To: Ardo Avancena <email@hidden>
Cc: <email@hidden>
Subject: Re: FxPlug OpenGL render FBO object to motion's FBO

Ardo,

It's not going to be possible for me to debug your plug-in for you. (Especially since there's no code for me to look at!) I run into these same sorts of issues when debugging texture-related problems all the time. I suggest re-reading everything you have about textures because it's likely that there's some bit of OpenGL state that's not in the right configuration.

Keep in mind that you need to bind your texture with a particular texture target of a particular texture unit. It will likely involve something like:

glActiveTexture (GL_TEXTURE<x>); // <- here x is a number 0 through the number of texture units. I usually use 0 if I only have 1 texture

glEnable (GL_TEXTURE_<target>); // <- here the target is whatever you specified when you created the texture. Probably GL_TEXTURE_RECTANGLE_ARB, possibly GL_TEXTURE_2D.
glBindTexture (GL_TEXTURE_<target>, texID); // The target must match the above, and the texID should be the ID of the texture you created

I didn't write all of that out originally because I assumed you were already doing that, but it sounds like maybe you're missing part of it.

Personally, I find OpenGL to be frustratingly documented, and inevitably there's some random bit of knowledge I learn that "every OpenGL programmer should just know," but that somehow every tutorial and man page I've ever read has left out. This is a really good article on common OpenGL mistakes:

<http://www.opengl.org/wiki/Common_Mistakes>

In particular, this section describes pretty well how to set all the things you need to set for a texture to work:

<http://www.opengl.org/wiki/Common_Mistakes#Creating_a_complete_texture>

I don't mind answering specific questions, but keep in mind that 1) this isn't the OpenGL programming list, so the OpenGL knowledge here may be particularly narrow, 2) without seeing your code, it will be nearly impossible to say for sure what the problem is, and 3) I have a limited amount of time to answer questions. If you need help beyond what we can give you here, you can always purchase a tech support incident.

Darrin

On Oct 21, 2013, at 10:23 AM, Ardo Avancena <email@hidden> wrote:

Hi darrin,

When I tried the
glEnable(GL_TEXTURE_RECTANGLE_RBA);
then glActiveTexture(myOutputTexture);

The subsequent drawings wont get loaded anymore, unless I take the enabled out (I think its because the current texture motion has is already gl_texture_rectangle_rba, just a speculation).
So I commented the enabled out and got only the glActiveTexture which provided my with the drawings on the motion's fbo without the one from my FBO.

I then tried changing the texture from gl_texture_rectangle_rba to gl_texture_2d, which made me uncomment the glEnable, but changed it to GL_TEXTURE_2D, followed by the glActivateTexture. Which provided me with a weird output, it only gave me a hint of what I have in the memory. here is the screenshot of what I managed to get. http://smg.photobucket.com/user/ardo/media/ScreenShot2013-10-21at101938AM.png.html

On Mon, Oct 21, 2013 at 9:52 AM, Darrin Cardani <email@hidden> wrote:

Once you have your result in a texture, you can simply set the FBO back to the one that Motion gives you, draw a textured quad that's the size of the output and apply your texture to it. So in pseudocode, it looks something like this:

MotionsFBO = saveCurrentFBO();
setCurrentFBO(myFBO, myOutputTexture);
DrawMyStuff();
glFlush();

setCurrentFBO (MotionsFBO);
glEnable(GL_TEXTURE_RECTANGLE_EXT); // or whichever texture target you've used for myOutputTexture

glActiveTexture(myOutputTexture);
glBegin(GL_QUADS);
glTexCoord2d(…);
glVertex2d(…);
… etc. …

glEnd();

Does that make sense?

Darrin

On Oct 21, 2013, at 9:46 AM, Ardo Avancena <email@hidden> wrote:

I'm wondering how I'm going to be able to render the fbo that I have prepared to the fbo that shows up in motion.

Here is the screenshot of what I have in my fbo found in the resources using opengl profiler.
http://smg.photobucket.com/user/ardo/media/ScreenShot2013-10-21at94306AM.png.html

Here is the fbo that contains what I draw in motion found in the resources using opengl profiler
http://smg.photobucket.com/user/ardo/media/ScreenShot2013-10-21at93948AM.png.html

I want to render the fbo I have in memory to the current fbo I see in motion.

The expected outcome should be the main texture in motion with the attached picture.

Any suggestions on how I should go about this one?
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References:
	>Re: FxPlug OpenGL render FBO object to motion's FBO (From: Darrin Cardani <email@hidden>)
	>Re: FxPlug OpenGL render FBO object to motion's FBO (From: Peter Litwinowicz <email@hidden>)

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