[Bug] gl.glGenFramebuffersEXT Causes JVM Crash

[Phenix]

I am writing a small game in java and started coded a FBO class. When I tested it the following appeared in my console

#
# An unexpected error has been detected by Java Runtime Environment:
#
#  EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x6959e29b, pid=1872, tid=3616
#
# Java VM: Java HotSpot(TM) Client VM (10.0-b22 mixed mode, sharing windows-x86)
# Problematic frame:
# C  [nvoglv32.dll+0x9e29b]
#
# An error report file with more information is saved as:
# J:\Programming\Java\Game Workspace\Game\hs_err_pid1872.log
#
# If you would like to submit a bug report, please visit:
#   http://java.sun.com/webapps/bugreport/crash.jsp
# The crash happened outside the Java Virtual Machine in native code.
# See problematic frame for where to report the bug.
#

Using the following code (The code is called from the display method of my Canvas - so the thread has got context):

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//Get the openGL object (with context!)      GL gl = GraphicsManager.getGL();             //Create a valid handle to manage the frame buffer      //this.intBuffer = IntBuffer.allocate(1);      //gl.glGenFramebuffersEXT(1, this.intBuffer);      gl.glGenFramebuffersEXT(1, ints, 0);       this.fbo = ints[0];       //this.fbo = this.intBuffer.get(0);             //Bind the FBO      gl.glBindFramebufferEXT(GL.GL_FRAMEBUFFER_EXT, this.fbo);             //Create a depth buffer      //this.intBuffer = IntBuffer.allocate(1);      gl.glGenRenderbuffersEXT(1, ints, 1); //this.intBuffer);      this.depthBuffer = ints[1];       //this.depthBuffer = this.intBuffer.get(0);             //Bind the render buffer      gl.glBindRenderbufferEXT(GL.GL_RENDERBUFFER_EXT, this.depthBuffer);             //Tell openGL how much storeage space we want for the render buffer      gl.glRenderbufferStorageEXT(GL.GL_RENDERBUFFER_EXT, GL.GL_DEPTH_COMPONENT, width, height);             //Now attach the render buffer to the FBO we created      gl.glFramebufferRenderbufferEXT(GL.GL_FRAMEBUFFER_EXT, GL.GL_DEPTH_ATTACHMENT_EXT, GL.GL_RENDERBUFFER_EXT, this.depthBuffer);             //Create a texture handle      //this.intBuffer = IntBuffer.allocate(1);      gl.glGenTextures(1, ints, 2); //this.intBuffer);      this.color_texture = ints[2];       //this.color_texture = this.intBuffer.get(0);             //Bind the handle as a 2D texture      gl.glBindTexture(GL.GL_TEXTURE_2D, this.color_texture);             //Set texture parameters      gl.glTexParameteri(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_MIN_FILTER, GL.GL_LINEAR);       gl.glTexParameteri(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_MAG_FILTER, GL.GL_LINEAR);       gl.glTexParameteri(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_WRAP_S, GL.GL_CLAMP_TO_EDGE);       gl.glTexParameteri(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_WRAP_T, GL.GL_CLAMP_TO_EDGE);       //Create a image of the same width and height as the render buffer      gl.glTexImage2D(GL.GL_TEXTURE_2D, 0, GL.GL_RGBA8, width, height, 0, GL.GL_RGBA, GL.GL_UNSIGNED_BYTE, null);             //Attach the colour texture to the FBO      gl.glFramebufferTexture2DEXT(GL.GL_FRAMEBUFFER_EXT, GL.GL_COLOR_ATTACHMENT0_EXT, GL.GL_TEXTURE_2D, this.color_texture, 0);                   int status = gl.glCheckFramebufferStatusEXT(GL.GL_FRAMEBUFFER_EXT);             this.active = true;             if (status != GL.GL_FRAMEBUFFER_COMPLETE_EXT)          throw new Exception("FBO Creation Error");       //Get the openGL object (with context!)      GL gl = GraphicsManager.getGL();             //Create a valid handle to manage the frame buffer      //this.intBuffer = IntBuffer.allocate(1);      //gl.glGenFramebuffersEXT(1, this.intBuffer);      gl.glGenFramebuffersEXT(1, ints, 0);       this.fbo = ints[0];       //this.fbo = this.intBuffer.get(0);             //Bind the FBO      gl.glBindFramebufferEXT(GL.GL_FRAMEBUFFER_EXT, this.fbo);             //Create a depth buffer      //this.intBuffer = IntBuffer.allocate(1);      gl.glGenRenderbuffersEXT(1, ints, 1); //this.intBuffer);      this.depthBuffer = ints[1];       //this.depthBuffer = this.intBuffer.get(0);             //Bind the render buffer      gl.glBindRenderbufferEXT(GL.GL_RENDERBUFFER_EXT, this.depthBuffer);             //Tell openGL how much storeage space we want for the render buffer      gl.glRenderbufferStorageEXT(GL.GL_RENDERBUFFER_EXT, GL.GL_DEPTH_COMPONENT, width, height);             //Now attach the render buffer to the FBO we created      gl.glFramebufferRenderbufferEXT(GL.GL_FRAMEBUFFER_EXT, GL.GL_DEPTH_ATTACHMENT_EXT, GL.GL_RENDERBUFFER_EXT, this.depthBuffer);             //Create a texture handle      //this.intBuffer = IntBuffer.allocate(1);      gl.glGenTextures(1, ints, 2); //this.intBuffer);      this.color_texture = ints[2];       //this.color_texture = this.intBuffer.get(0);             //Bind the handle as a 2D texture      gl.glBindTexture(GL.GL_TEXTURE_2D, this.color_texture);             //Set texture parameters      gl.glTexParameteri(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_MIN_FILTER, GL.GL_LINEAR);       gl.glTexParameteri(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_MAG_FILTER, GL.GL_LINEAR);       gl.glTexParameteri(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_WRAP_S, GL.GL_CLAMP_TO_EDGE);       gl.glTexParameteri(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_WRAP_T, GL.GL_CLAMP_TO_EDGE);       //Create a image of the same width and height as the render buffer      gl.glTexImage2D(GL.GL_TEXTURE_2D, 0, GL.GL_RGBA8, width, height, 0, GL.GL_RGBA, GL.GL_UNSIGNED_BYTE, null);             //Attach the colour texture to the FBO      gl.glFramebufferTexture2DEXT(GL.GL_FRAMEBUFFER_EXT, GL.GL_COLOR_ATTACHMENT0_EXT, GL.GL_TEXTURE_2D, this.color_texture, 0);                   int status = gl.glCheckFramebufferStatusEXT(GL.GL_FRAMEBUFFER_EXT);             this.active = true;             if (status != GL.GL_FRAMEBUFFER_COMPLETE_EXT)          throw new Exception("FBO Creation Error");

I have narrowed the line of code which caused the error to the third line; gl.glGenFramebuffersEXT(1, ints, 0);

I have a game logic thread running as well as a render thread. When I do not run the game logic thread the FBO is created without an issue. However stopping my logic thread to create FBO's when I need them doesnt really lend itself to good game play.

The logic thread does no interact with the FBO class in any way so I am at a lost of why it is happening. Does anybody have a solution with does not involve either pausing my logic thread or creating all fbo's at engine startup?

[GKW]

Does your logic thread access the "ints" variable?  Possibly the logic thread is uninitializing that variable?  There's not much that can go wrong with that method.

[Phenix]

No, at no point does the logic thread even access the FBO class

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[GKW]

So you are sure that the "ints" variable is created, initialized and is never modified by the logic thread?  Does the logic thread make any GL calls at all?  That's just a little odd that the code works when the logic thread is paused but doesn't work when it's running, assuming that it doesn't alter the "ints" variable in anyway.

[lhkbob]

I have a game logic thread running as well as a render thread. When I do not run the game logic thread the FBO is created without an issue. However stopping my logic thread to create FBO's when I need them doesnt really lend itself to good game play.

I'm pretty sure you can keep fbo's around for a while instead of creating a new one whenever you need it.  Perhaps it's better to initialize them once in the beginning -- where you can stop the logic thread -- and reuse any fbo id's later on for effects.