Stack Level Too Deep Crash

[ashes999]

Hi,

I just installed gosu today via Ruby 1.9.3 (gem install ...) on Windows. I have confirmed that:

• I can create a working Ruboto app (non-gosu)
• I can create a working Gosu app (Windows)

However, I can't get a working combination of the two. When I generate a new ruboto sample app and just add require 'gosu', I get this exception at runtime:

FATAL EXCEPTION: Thread-11 org.jruby.embed.EvalFailedException: (SystemStackError) stack level too deep .. at RUBY.JavaImports(file:/data/app/com.blastcube-1.apk!/lib/requires.rb:7

Full exception is pictured below. I followed the deployment instructions from the trunk branch

Screenshot below of logcat on Bluestacks.

[Era-Dorta]

Hi,
First thanks for taking interest in this project.
The problem appears because on Android you cannot use directly a relative file path to load stuff.

@background_image = Gosu::Image.new(self, "media/background.jpg", true)

So you have two options:

• If you are working on a rooted device use the full file path. For example /mnt/media/background.jpg, given that
  you previously uploaded the file there.
• If your device is not rooted use Android Resources variable:
  • Place the background.jpg file in the folder your_ruboto_project/res/drawable-nodpi
  • Replace

@background_image = Gosu::Image.new(self, "media/background.jpg", true)

to

@background_image = Gosu::Image.new(self, Ruboto::R::drawable::background, true)

and that should do the trick.

Anyway I'm still working to release a first stable version of gosu-android also, sometime soon I'll upload new samples and I'll create a wiki with more detailed information.

[ashes999]

Hi,

Thanks for your reply. I don't think that's the problem, because I deleted all of that code -- I only have a standard, freshly-generated Ruboto app, with one additional line:

include 'gosu'

This is enough to show this error; I don't even load any images, sounds, etc. It may be because I'm using BlueStacks, so I'll see if I get a chance to try it on a real phone.

Cheers (great project by the way)!

[Era-Dorta]

I just realize that the error occurs when loading android openGL libraries.

java_import "javax.microedition.khronos.egl.EGL10" 

I don't have any experience in BlueStacks, could you add this line to your main.rb file an tell me the output?
So far I've tested the code in a real device with Android 3.0 and in an emulator created with the android sdk.

[ashes999]

Hi,

I have the OpenGL 3d rotating cube OpenGL sample that ships with Ruboto working (code is below). It works fine (the same as ruboto-irb). It uses Android OpenGL, and has the same line of code you asked me about.

#
# glsurfaceview.rb (by Scott Moyer)
#
# This demo ports the GLSurfaceView demo from the Android
# API Demos to Ruboto.
#
#######################################################

require 'ruboto/widget'
require 'ruboto/activity'

#require 'opengl'

java_import "javax.microedition.khronos.egl.EGL10"
java_import "javax.microedition.khronos.egl.EGLConfig"
java_import "javax.microedition.khronos.opengles.GL10"

java_import "java.nio.ByteBuffer"
java_import "java.nio.ByteOrder"
java_import "java.nio.IntBuffer"

ruboto_import_widget :GLSurfaceView, "android.opengl"

##########################
#
# Cube Class
#
# Needs to get set up before the Activity tries to use it
#

class Cube
  def initialize
    one = 0x10000
    vertices = [
      -one, -one, -one,
       one, -one, -one,
       one, one, -one,
      -one, one, -one,
      -one, -one, one,
       one, -one, one,
       one, one, one,
      -one, one, one,
    ]

    colors = [
        0, 0, 0, one,
      one, 0, 0, one,
      one, one, 0, one,
        0, one, 0, one,
        0, 0, one, one,
      one, 0, one, one,
      one, one, one, one,
        0, one, one, one,
     ]

    indices = [
      0, 4, 5, 0, 5, 1,
      1, 5, 6, 1, 6, 2,
      2, 6, 7, 2, 7, 3,
      3, 7, 4, 3, 4, 0,
      4, 7, 6, 4, 6, 5,
      3, 0, 1, 3, 1, 2
    ]

    vbb = ByteBuffer.allocateDirect(vertices.length*4)
    vbb.order(ByteOrder.nativeOrder)
    @vertex_buffer = vbb.asIntBuffer
    @vertex_buffer.put(vertices.to_java(:int))
    @vertex_buffer.position(0)

    cbb = ByteBuffer.allocateDirect(colors.length*4)
    cbb.order(ByteOrder.nativeOrder)
    @color_buffer = cbb.asIntBuffer
    @color_buffer.put(colors.to_java(:int))
    @color_buffer.position(0)

    @index_buffer = ByteBuffer.allocateDirect(indices.length)
    @index_buffer.put(indices.to_java(:byte))
    @index_buffer.position(0)
  end

  def draw(gl)
    gl.glFrontFace(GL10::GL_CW)
    gl.glVertexPointer(3, GL10::GL_FIXED, 0, @vertex_buffer)
    gl.glColorPointer(4, GL10::GL_FIXED, 0, @color_buffer)
    gl.glDrawElements(GL10::GL_TRIANGLES, 36, GL10::GL_UNSIGNED_BYTE, @index_buffer)
  end
end

#######################################################
#
# RubotoGLSurfaceViewRenderer
#
# The interface android.opengl.GLSurfaceView$Renderer
#

class RubotoGLSurfaceViewRenderer
  def initialize
    @translucent_background = false
    @cube = Cube.new
    @angle = 0.0
    @offset = 1.2
  end

  def onDrawFrame(gl)
    gl.glClear(GL10::GL_COLOR_BUFFER_BIT | GL10::GL_DEPTH_BUFFER_BIT)

    gl.glMatrixMode(GL10::GL_MODELVIEW)
    gl.glLoadIdentity
    gl.glTranslatef(0, 0, -3.0)
    gl.glRotatef(@angle, 0, 1, 0)
    gl.glRotatef(@angle*0.25, 1, 0, 0)

    gl.glEnableClientState(GL10::GL_VERTEX_ARRAY)
    gl.glEnableClientState(GL10::GL_COLOR_ARRAY)

    @cube.draw(gl)

    gl.glRotatef(@angle*2.0, 0, 1, 1)
    gl.glTranslatef(0.5, 0.5, 0.5)

    @cube.draw(gl)
    @angle += @offset
  end

  def onSurfaceChanged(gl, width, height)
    gl.glViewport(0, 0, width, height)
    ratio = width.to_f / height.to_f
    gl.glMatrixMode(GL10::GL_PROJECTION)
    gl.glLoadIdentity
    gl.glFrustumf(-ratio, ratio, -1, 1, 1, 10)
  end

  def onSurfaceCreated(gl, config)
    gl.glDisable(GL10::GL_DITHER)

    gl.glHint(GL10::GL_PERSPECTIVE_CORRECTION_HINT, GL10::GL_FASTEST)

    if (@translucent_background)
      gl.glClearColor(0,0,0,0)
    else
      gl.glClearColor(1,1,1,1)
    end
    gl.glEnable(GL10::GL_CULL_FACE)
    gl.glShadeModel(GL10::GL_SMOOTH)
    gl.glEnable(GL10::GL_DEPTH_TEST)
  end

  def change_angle
    @offset = -@offset
  end
end

class RubotoTestActivity
  def on_create(bundle)
    super

    begin
      action_bar.hide
    rescue
      set_title("GLSurfaceView Demo")
    end

    @renderer = RubotoGLSurfaceViewRenderer.new
    @surface_view = g_l_surface_view :renderer => @renderer, 
                                     :on_click_listener => (proc{@renderer.change_angle})

    self.content_view = @surface_view
  end 

  def on_resume
    super
    @surface_view.on_resume
  end

  def on_pause
    super
    @surface_view.on_pause
  end

end

[ashes999]

Sorry, I should have just listened to you from the start.

Runs fine on my real phone. If I start importing stuff in my main .rb file before requiring gosu, eventually I'll get to the point where I java_import the color file and it needs a constant that's not defined (Gosu::Color). It seems like the Bluestacks emulator just has a poorly-sized stack frame limit.

On my real device, I can get a "hello world" ruboto app with require 'gosu' running. But as soon as I start adding any code, I run into this error again (the stack trace seems to be `require 'gosu' => reuiqre 'lib/main-window' => require 'lib/requires'). There seems to be some sort of infinite requires loop.

Here's the stack from Bluestacks:

org.jruby.embed.EvalFailedException: (SystemStackError) stack level too deep
  at org.jruby.embed.internal.EmbedEvaultUnitImpl.run(EmbedEvaultUnitImpl.java:133)
  at org.jruby.embed.ScriptingContainer.runUnit(ScriptingContainer.java:1264)
  at org.jruby.embed.ScriptingContainer.runScriptlet(ScriptingContainer.java:1257)
  at java.lang.reflect.Method.invokeNative(Native Method)
  at java.lang.reflect.Method.invoke(Method.java:507)
  at org.ruboto.JRubyAdapter.runScriptlet(JRubyAdapter.java:213)
  at org.ruboto.ScriptLoader$1.run(ScriptLoader.java:82)
  at java.lang.Thread.run(Thread.java:1019)
Caused by: org.jruby.exceptions.RaiseException: (SystemStackError) stack level too deep
  at org.jruby.RubyArray.map(org/jruby/RubyArray.java:2361)
  at RUBY.java_import(file:/data/app/org.ruboto.core-1.apk!/jruby/java/core_ext/object.rb:22)
  at RUBY.JavaImports(file:/data.app/com.blastcube-1.apk!/lib/requires.rb:7)
  at RUBY.(root)(file:/data/app/com.blastcube-1.apk!/lib/requires.rb:3)

  at org.jruby.RubyKernel.require(org/jruby/RubyKernel.java:1027)
  at RUBY.(root)(jar:file:/data/app/org.ruboto.core-1.apk!/jruby.home/lib/ruby/shared/rubygems/custom_require.rb:1)
  at RUBY.(root)(jar:file:/data/app/org.ruboto.core-1.apk!/jruby.home/lib/ruby/shared/rubygems/custom_require.rb:36)
  at org.jruby.RubyKernel.require(org/jruby/RubyKernel.java:1027)
  at RUBY.(root)(jar:/data/app/com.blastcube-1.apk!/lib/main-window.rb:1)
  at RUBY.(root)(jar:file:/data/app/org.ruboto.core-1.apk!/jruby.home/lib/ruby/shared/rubygems/custom_require.rb:1)
  at org.jruby.RubyKernel.require(org/jruby/RubyKernel.java:1027)
  at RUBY.(root)(jar:file:/data/app/org.ruboto.core-1.apk!/jruby.home/lib/ruby/shared/rubygems/custom_require.rb:36)
  at RUBY.(root)(file:/data/app/com.blastcube-1.apk!/gosu.rb:1)

Notice the last section (which I spaced out). You have RubyKernal:1027 > custom_require.rb:1 > custom_require.rb:36 > RubyKernal:1027 > main-window:1 > custom_require:1 > custom_require:36 > ...

This might be a core gosu bug. It seems like requiring gems with a lot of dependencies eventually errors out because the stack is too small. I'll open an issue on the gosu repository and we'll see how it goes.

[ashes999]

This was fixed with the underlying Ruboto fix (require gosu in a large stack thread).