LWJGL Forum

Hi,

I would like to post a potential bug, I have the newest drivers for a AMD A10 5800K setup. Perhaps it is indeed a problem with AMD's apu; I read somewhere it happened in Modern Warfare as well (random read on the internet).

      for (int side = 0; side < 2; side++)
       {
           
           glPushAttrib(GL_ALL_ATTRIB_BITS);
           glBindTexture(GL_TEXTURE_2D, 0);
           glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, modelsFboId[side]);

           glViewport(0,0,screenWidth,screenHeight);
           glMatrixMode(GL_PROJECTION);
           glLoadIdentity();
           gluPerspective(SCREEN_FOV, SCREEN_RAT, NEAR, FAR);
           glMatrixMode(GL_MODELVIEW);
           glLoadIdentity();
           glShadeModel(GL_SMOOTH);
           glHint(GL_PERSPECTIVE_CORRECTION_HINT,
               GL_NICEST);
           glDisable(GL_BLEND);
           glEnable(GL_DEPTH_TEST);
           glDepthFunc(GL_LESS);
           glDepthMask(true);
           glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
           glClearDepth(1.0f);
           glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

           glLoadIdentity ();

           camera.look();
               
           drawObject();

           glDisable(GL_DEPTH_TEST);
           glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);

           glPopAttrib();
       }

I loop over two fbo's which are both created in a loop as well. The fbo's work fine, however the second iteration the texture doesn't want to bind. I tried switching to different active texture for the second iteration, I have a shader which I disabled, I tried setting the clientactivetexture as well. If I skip the first iteration nothing changes for the second If I skip the first iteration the second works. When I attach a color instead of a texture the object DOES show (it doesn't show at all with the texture bound).

I tried tracking down this bug for a good two days now to no avail.


      for (int side = 0; side < 2; side++) {
           modelsFboId[side] = glGenFramebuffersEXT();
           modelsFboTextureId[side] = glGenTextures();
           modelsDepthRenderBufferId[side] = glGenRenderbuffersEXT();

           glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, modelsFboId[side]);

           glBindTexture(GL_TEXTURE_2D, modelsFboTextureId[side]);
           glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
           glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
           glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, screenWidth, screenHeight, 0,GL_RGBA, GL_INT, (java.nio.ByteBuffer) null);
           glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT,GL_COLOR_ATTACHMENT0_EXT,GL_TEXTURE_2D, modelsFboTextureId[side], 0);

           glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, modelsDepthRenderBufferId[side]);        
           glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_DEPTH_COMPONENT, screenWidth, screenHeight);
           glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT,GL_DEPTH_ATTACHMENT_EXT,GL_RENDERBUFFER_EXT, modelsDepthRenderBufferId[side]);
           glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
         }

I do not get any errors out of opengl. I will to try to recreate the bug in a project and post it if that is necessary.

Thanks for the help in advance, this is really frustrating to me!

EDIT: Cleaned up matrix inits
EDIT2: I tried this with another computer as well, exact same problem.

Bump

Quote from: Kajos on February 18, 2013, 11:25:48
Bump

LOL, this isn't a very active forum. Give us more then 20 hours to respond.  :P

As to your problem, it looks very strange to me that you are clearing the screen (and doing all your perspective settings, etc.) in your loop.
Try something more like:

glViewport(0,0,screenWidth,screenHeight);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(SCREEN_FOV, SCREEN_RAT, NEAR, FAR);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glShadeModel(GL_SMOOTH);
glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
glDisable(GL_BLEND);
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LESS);
glDepthMask(true);
glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
glClearDepth(1.0f);
glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

glLoadIdentity ();
camera.look();

for (int side = 0; side < 2; side++)
{
            glPushMatrix(); // You may not need the push/pop of the matrix depending on what your draw code does.
            glPushAttrib(GL_ALL_ATTRIB_BITS);
            glBindTexture(GL_TEXTURE_2D, 0);
            glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, modelsFboId[side]);

            drawObject();

            glPopAttrib();
            glPopMatrix();
}

glDisable(GL_DEPTH_TEST);
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);


Hi, no matter, I solved it! :) The loop is fine I think, it needs to render to two different fbo's, however I found that Slick needs to unbind textures for some (unknown to me) reason. TextureImpl.unbind() solved it.