yair reshef

i have been doing some lua coding on an xp machine.

1. something strange about the screentoworld routine, when z is set to 0. or

1. i get unusable results. when at 0.95 its almost there, why?

2. i use display lists, is that good? were do i plug the gl states in that

situation. i want blend effects. i commented the lines i think i need.

3. when i enter fullscreen i lose the drawing.

thanks , it's fun coding in lua. and i feel can tackle some of nehe's opengl

posting on the list so i hope it will not break in the forum.

gl.Vertex ( 0.5 , 0.5 , 0. ) -- Top Right

gl.Vertex ( 0.5 ,-0.5 , 0. ) -- Bottom Right

gl.Clear("COLOR_BUFFER_BIT" , "DEPTH_BUFFER_BIT")

gl.Translate(mouseXY[1],mouseXY[2],(i/1000)-1);

gl.Color(i/1000, math.random(), 1, i/1000)

--need to transform mouse ccordinates to world domain

mouseXY=jit.gl.screentoworld({_glXmouse,_glYmouse, 0.95})

listener = jit.listener(render_context, "callback")

hi, all (err... wesly)
i have been doing some lua coding on an xp machine.

i have a few questions,
1. something strange about the screentoworld routine, when z is set to 0. or
1. i get unusable results. when at 0.95 its almost there, why?
2. i use display lists, is that good? were do i plug the gl states in that
situation. i want blend effects. i commented the lines i think i need.
3. when i enter fullscreen i lose the drawing.

thanks , it's fun coding in lua. and i feel can tackle some of nehe's opengl
tutorial with it.
posting on the list so i hope it will not break in the forum.

autowatch = 1
print("compiled")
render_context = this.drawto
angle=0
mouseXY={0,0}
dir=1

    box = gl.GenLists(2)
    gl.NewList(box    ,"COMPILE");
        gl.Begin("QUADS")
            gl.Vertex (-0.5 , 0.5 , 0. )                -- Top Left
            gl.Vertex ( 0.5 , 0.5 , 0. )                -- Top Right
            gl.Vertex ( 0.5 ,-0.5 , 0. )            -- Bottom Right
            gl.Vertex (-0.5 ,-0.5 , 0. )
        gl.End();
    gl.EndList()
end
function init()
--initialize the dispaly list
    BuildLists()
end
init()

function draw()
    gl.Clear("COLOR_BUFFER_BIT" , "DEPTH_BUFFER_BIT")
    --gl.LoadIdentity()
    --gl.Enable("BLEND")
    --gl.BlendFunc(1,6)
    --gl.ClearColor(1,1,0,1)
    rot()
    for i=0,1000 do
    gl.Translate(mouseXY[1],mouseXY[2],(i/1000)-1);
    gl.Rotate(angle,0,0,1)
    gl.Color(i/1000, math.random(), 1, i/1000)
    gl.CallList(box)
    end

function rot()
    angle = angle+dir
    if angle==15 then dir= -0.5
    elseif angle==0 then dir=0.5
    end
end

--create the listener callback function
function callback(event)
    if(event.eventname == "mouseidle") then
        local _glXmouse = event.args[1]
        local _glYmouse = event.args[2]
        --need to transform mouse ccordinates to world domain
        --dono why, but 0.95 needed
        mouseXY=jit.gl.screentoworld({_glXmouse,_glYmouse, 0.95})
    end
end

--create a listener object
listener = jit.listener(render_context, "callback")

++++++++++++++++++
patch
++++++++++++++++


lua-questions

Welcome to Lua land. I dig the feedback spiral. The screentoworld

function is basically doing gluUnproject. See the doc here:

http://developer.apple.com/documentation/Darwin/Reference/ManPages/man3/gluUnProject.3.html

The 0 for Z depth in window coordinates is mapped to the near clip

plane value and 1 to the far clip value. Z depth is non-linear and

thus annoyingly not intuitive to our typical sense of parameter values

As for displaylists, these things have to be created when there is a

valid context and _must_ be rebuilt when that context changes like

when you go fullscreen. In jit.gl.lua, there are a few functions

defined to notify a script of things like context changes or scripts

So, to properly handle displaylists, You need to create it whenever

the context changes or your script reloads with a valid context.

jit.gl.lua has an attr called context which is 0 when there is no

valid context and non-zero when there is a valid context (it is also

Here's a slight mod I made to your script (full script is further

below) using some of the nice aspects of having functions as

+++++++++++++++++++++++++++++++++++++++++++++++++++++++

Hi Yair,
Welcome to Lua land.  I dig the feedback spiral.  The screentoworld
function is basically doing gluUnproject.  See the doc here:
http://developer.apple.com/documentation/Darwin/Reference/ManPages/man3/gluUnProject.3.html

The 0 for Z depth in window coordinates is mapped to the near clip
plane value and 1 to the far clip value.  Z depth is non-linear and
thus annoyingly not intuitive to our typical sense of parameter values
mapping to euclidean coordinates.

As for displaylists, these things have to be created when there is a
valid context and _must_ be rebuilt when that context changes like
when you go fullscreen.  In jit.gl.lua, there are a few functions
defined to notify a script of things like context changes or scripts
loading happen. These are:

script_load
dest_changed
dest_closing
etc.
see the PDF doc for a complete list

So, to properly handle displaylists, You need to create it whenever
the context changes or your script reloads with a valid context.
jit.gl.lua has an attr called context which is 0 when there is no
valid context and non-zero when there is a valid context (it is also
unique per-context).

Here's a slight mod I made to your script (full script is further
below) using some of the nice aspects of having functions as
variables:

-- functions as variables!
function setOnReloadOrDestChanged(func)
	script_load = func
	det_changed = func
end
setOnReloadOrDestChanged(init)

--[[
This section is equivalent to the above

+++++++++++++++++++++++++++++++++++++++++++++++++++++++
Full script
+++++++++++++++++++++++++++++++++++++++++++++++++++++++
 autowatch = 1
print("compiled")
render_context = this.drawto
angle=0
mouseXY={0,0}
dir=1

    box = gl.GenLists(2)
    gl.NewList(box    ,"COMPILE");
        gl.Begin("QUADS")
            gl.Vertex (-0.5 , 0.5 , 0. )                -- Top Left
            gl.Vertex ( 0.5 , 0.5 , 0. )                -- Top Right
            gl.Vertex ( 0.5 ,-0.5 , 0. )            -- Bottom Right
            gl.Vertex (-0.5 ,-0.5 , 0. )
        gl.End();
    gl.EndList()
end
function init()
--initialize the dispaly list
	if(this.context ~= 0) then
	    BuildLists()
	end
end

function rot()
    angle = angle+dir
    if angle==15 then dir= -0.5
    elseif angle==0 then dir= 0.5
    end
end

--create a listener object
listener = jit.listener(render_context, "callback")


Sorry, there was a slight typo in my script in the last post. Here's

Sorry, there was a slight typo in my script in the last post.  Here's
a fixed version:

-- functions as variables!
function setOnReloadOrDestChanged(func)
	script_load = func
	dest_changed = func
end
setOnReloadOrDestChanged(init)

i'm still having difficulties with the placement of

my intuition tells me it should be in the init function, but no go.

On Jan 2, 2008 5:26 AM, Wesley Smith wrote:

> Sorry, there was a slight typo in my script in the last post. Here's

> gl.Vertex (-0.5 , 0.5 , 0. ) -- Top Left

> gl.Vertex ( 0.5 , 0.5 , 0. ) -- Top Right

> gl.Vertex ( 0.5 ,-0.5 , 0. ) -- Bottom Right

> function setOnReloadOrDestChanged(func)

> This section is equivalent to the above

i'm still having difficulties with the placement of
  gl.Enable("BLEND")
  gl.BlendFunc(1,6)
  gl.ClearColor(0,0,0,0.5)
my intuition tells me it should be in the init function, but no go.

On Jan 2, 2008 5:26 AM, Wesley Smith  wrote:

> Sorry, there was a slight typo in my script in the last post.  Here's
> a fixed version:
>
>
> autowatch = 1
> print("compiled")
> render_context = this.drawto
> angle=0
> mouseXY={0,0}
> dir=1
>
>
>
> function BuildLists()
>
>    box = gl.GenLists(2)
>    gl.NewList(box    ,"COMPILE");
>        gl.Begin("QUADS")
>            gl.Vertex (-0.5 , 0.5 , 0. )                -- Top Left
>            gl.Vertex ( 0.5 , 0.5 , 0. )                -- Top Right
>            gl.Vertex ( 0.5 ,-0.5 , 0. )            -- Bottom Right
>            gl.Vertex (-0.5 ,-0.5 , 0. )
>        gl.End();
>    gl.EndList()
> end
> function init()
> --initialize the dispaly list
>        if(this.context ~= 0) then
>            BuildLists()
>        end
> end
>
>
> -- functions as variables!
> function setOnReloadOrDestChanged(func)
>        script_load = func
>        dest_changed = func
> end
> setOnReloadOrDestChanged(init)
>
> --[[
> This section is equivalent to the above
>
> function script_load()
>        init()
> end
>
> function dest_changed()
>        init()
> end
> --]]
>
> function draw()
>    gl.Clear("COLOR_BUFFER_BIT" , "DEPTH_BUFFER_BIT")
>    --gl.LoadIdentity()
>    --gl.Enable("BLEND")
>    --gl.BlendFunc(1,6)
>    --gl.ClearColor(1,1,0,1)
>    rot()
>    for i=0,1000 do
>    gl.Translate(mouseXY[1],mouseXY[2],(i/1000)-1);
>    gl.Rotate (angle,0,0,1)
>    gl.Color(i/1000, math.random(), 1, i/1000)
>    gl.CallList(box)
>    end
>
> end
>
> function rot()
>    angle = angle+dir
>    if angle==15 then dir= -0.5
>    elseif angle==0 then dir= 0.5
>    end
> end
>
> --create the listener callback function
> function callback(event)
>    if(event.eventname == "mouseidle") then
>        local _glXmouse = event.args[1]
>        local _glYmouse = event.args[2]
>        --need to transform mouse ccordinates to world domain
>        --dono why, but 0.95 needed
>        mouseXY=jit.gl.screentoworld({_glXmouse,_glYmouse, 0.95})
>    end
> end
>
> --create a listener object
> listener = jit.listener(render_context, "callback")
>

like the redbook says, but without the GL_

http://www.cs.rutgers.edu/~decarlo/428/gl_man/blendfunc.html

Quote: yair r. wrote on Wed, 02 January 2008 04:18

----------------------------------------------------

> i'm still having difficulties with the placement of

> my intuition tells me it should be in the init function, but no go.

like the redbook says, but without the GL_
http://www.cs.rutgers.edu/~decarlo/428/gl_man/blendfunc.html

Quote: yair r. wrote on Wed, 02 January 2008 04:18
----------------------------------------------------
> thanks wes, lua is so flexible
>
> i'm still having difficulties with the placement of
>   gl.Enable("BLEND")
>   gl.BlendFunc(1,6)
>   gl.ClearColor(0,0,0,0.5)
> my intuition tells me it should be in the init function, but no go.


On Jan 2, 2008 4:51 AM, Erik Mijwaard wrote:

Indeed, this is the way to go. The Jitter constants for blend

functions just enumerate the list of enums. In jit.gl.lua, the enums

have become strings corresponding to the name of the enum. BTW, if

you get errors from the ONE enum and you have the latest version of

jit.gl.lua for your platform, let me know.

On Jan 2, 2008 4:51 AM, Erik Mijwaard  wrote:
>
>
> try this:
>
> gl.BlendFunc(ONE, ONE_MINUS_SRC_ALPHA)
>

Indeed, this is the way to go.  The Jitter constants for blend
functions just enumerate the list of enums.  In jit.gl.lua, the enums
have become strings corresponding to the name of the enum.  BTW, if
you get errors from the ONE enum and you have the latest version of
jit.gl.lua for your platform, let me know.

ob3d_draw_preamble initial: GL Error: Invalid enumeration

gl.BlendFunc("ONE", "ONE_MINUS_SRC_ALPHA")

On Jan 2, 2008 6:42 PM, Wesley Smith wrote:

> On Jan 2, 2008 4:51 AM, Erik Mijwaard wrote:

> > gl.BlendFunc(ONE, ONE_MINUS_SRC_ALPHA)

> Indeed, this is the way to go. The Jitter constants for blend

> functions just enumerate the list of enums. In jit.gl.lua, the enums

> have become strings corresponding to the name of the enum. BTW, if

> you get errors from the ONE enum and you have the latest version of

> jit.gl.lua for your platform, let me know.

ye, i got an error. im on beta4
ob3d_draw_preamble initial: GL Error: Invalid enumeration

function init()
--initialize the dispaly list
       if(this.context ~= 0) then
           BuildLists()
   gl.Enable("BLEND")
   gl.BlendFunc("ONE", "ONE_MINUS_SRC_ALPHA")
   --gl.ClearColor(1,1,0,1)
       end
end

On Jan 2, 2008 6:42 PM, Wesley Smith  wrote:

> On Jan 2, 2008 4:51 AM, Erik Mijwaard  wrote:
> >
> >
> > try this:
> >
> > gl.BlendFunc(ONE, ONE_MINUS_SRC_ALPHA)
> >
>
> Indeed, this is the way to go.  The Jitter constants for blend
> functions just enumerate the list of enums.  In jit.gl.lua, the enums
> have become strings corresponding to the name of the enum.  BTW, if
> you get errors from the ONE enum and you have the latest version of
> jit.gl.lua for your platform, let me know.
>
> wes
>

ok, I'll have an update soon. I'm assuming you're on windows?

On Jan 2, 2008 9:05 AM, yair reshef wrote:

> ob3d_draw_preamble initial: GL Error: Invalid enumeration

> gl.BlendFunc("ONE", "ONE_MINUS_SRC_ALPHA")

> On Jan 2, 2008 6:42 PM, Wesley Smith < wesley.hoke@gmail.com> wrote:

> > On Jan 2, 2008 4:51 AM, Erik Mijwaard < erik@videotroopers.com> wrote:

> > > gl.BlendFunc(ONE, ONE_MINUS_SRC_ALPHA)

> > Indeed, this is the way to go. The Jitter constants for blend

> > functions just enumerate the list of enums. In jit.gl.lua, the enums

> > have become strings corresponding to the name of the enum. BTW, if

> > you get errors from the ONE enum and you have the latest version of

> > jit.gl.lua for your platform, let me know.

ok, I'll have an update soon.  I'm assuming you're on windows?

On Jan 2, 2008 9:05 AM, yair reshef  wrote:
> ye, i got an error. im on beta4
> ob3d_draw_preamble initial: GL Error: Invalid enumeration
>
>
> function init()
> --initialize the dispaly list
>        if(this.context ~= 0) then
>            BuildLists()
>    gl.Enable ("BLEND")
>
>    gl.BlendFunc("ONE", "ONE_MINUS_SRC_ALPHA")
>    --gl.ClearColor(1,1,0,1)
>        end
> end
>
>
>
>
> On Jan 2, 2008 6:42 PM, Wesley Smith < wesley.hoke@gmail.com> wrote:
> >
> >
> >
> >
> > On Jan 2, 2008 4:51 AM, Erik Mijwaard < erik@videotroopers.com> wrote:
> > >
> > >
> > > try this:
> > >
> > > gl.BlendFunc(ONE, ONE_MINUS_SRC_ALPHA)
> > >
> >
> > Indeed, this is the way to go.  The Jitter constants for blend
> > functions just enumerate the list of enums.  In jit.gl.lua, the enums
> > have become strings corresponding to the name of the enum.  BTW, if
> > you get errors from the ONE enum and you have the latest version of
> > jit.gl.lua for your platform, let me know.
> >
> > wes
> >
> >
> >
> >
> >
>
>
>
>


ok, I've updated to beta4.1 with a new windows external fixing the ONE

enum problem. Let me know if you still have issues.

On Jan 2, 2008 9:33 AM, Wesley Smith wrote:

> ok, I'll have an update soon. I'm assuming you're on windows?

> On Jan 2, 2008 9:05 AM, yair reshef wrote:

> > ob3d_draw_preamble initial: GL Error: Invalid enumeration

> > gl.BlendFunc("ONE", "ONE_MINUS_SRC_ALPHA")

> > On Jan 2, 2008 6:42 PM, Wesley Smith < wesley.hoke@gmail.com> wrote:

> > > On Jan 2, 2008 4:51 AM, Erik Mijwaard < erik@videotroopers.com> wrote:

> > > > gl.BlendFunc(ONE, ONE_MINUS_SRC_ALPHA)

> > > Indeed, this is the way to go. The Jitter constants for blend

> > > functions just enumerate the list of enums. In jit.gl.lua, the enums

> > > have become strings corresponding to the name of the enum. BTW, if

> > > you get errors from the ONE enum and you have the latest version of

> > > jit.gl.lua for your platform, let me know.

ok, I've updated to beta4.1 with a new windows external fixing the ONE
enum problem.  Let me know if you still have issues.
wes

On Jan 2, 2008 9:33 AM, Wesley Smith  wrote:
> ok, I'll have an update soon.  I'm assuming you're on windows?
>
> wes
>
>
> On Jan 2, 2008 9:05 AM, yair reshef  wrote:
> > ye, i got an error. im on beta4
> > ob3d_draw_preamble initial: GL Error: Invalid enumeration
> >
> >
> > function init()
> > --initialize the dispaly list
> >        if(this.context ~= 0) then
> >            BuildLists()
> >    gl.Enable ("BLEND")
> >
> >    gl.BlendFunc("ONE", "ONE_MINUS_SRC_ALPHA")
> >    --gl.ClearColor(1,1,0,1)
> >        end
> > end
> >
> >
> >
> >
> > On Jan 2, 2008 6:42 PM, Wesley Smith < wesley.hoke@gmail.com> wrote:
> > >
> > >
> > >
> > >
> > > On Jan 2, 2008 4:51 AM, Erik Mijwaard < erik@videotroopers.com> wrote:
> > > >
> > > >
> > > > try this:
> > > >
> > > > gl.BlendFunc(ONE, ONE_MINUS_SRC_ALPHA)
> > > >
> > >
> > > Indeed, this is the way to go.  The Jitter constants for blend
> > > functions just enumerate the list of enums.  In jit.gl.lua, the enums
> > > have become strings corresponding to the name of the enum.  BTW, if
> > > you get errors from the ONE enum and you have the latest version of
> > > jit.gl.lua for your platform, let me know.
> > >
> > > wes
> > >
> > >
> > >
> > >
> > >
> >
> >
> >
> >
>


the "one" enumeration error disappeared but i tried the others and "ZERO"

On Jan 2, 2008 8:11 PM, Wesley Smith wrote:

> ok, I've updated to beta4.1 with a new windows external fixing the ONE

> enum problem. Let me know if you still have issues.

> On Jan 2, 2008 9:33 AM, Wesley Smith wrote:

> > ok, I'll have an update soon. I'm assuming you're on windows?

> > On Jan 2, 2008 9:05 AM, yair reshef wrote:

> > > ob3d_draw_preamble initial: GL Error: Invalid enumeration

> > > gl.BlendFunc("ONE", "ONE_MINUS_SRC_ALPHA")

> > > On Jan 2, 2008 6:42 PM, Wesley Smith < wesley.hoke@gmail.com> wrote:

> > > > On Jan 2, 2008 4:51 AM, Erik Mijwaard < erik@videotroopers.com>

> > > > > gl.BlendFunc(ONE, ONE_MINUS_SRC_ALPHA)

> > > > Indeed, this is the way to go. The Jitter constants for blend

> > > > functions just enumerate the list of enums. In jit.gl.lua, the

> > > > have become strings corresponding to the name of the enum. BTW, if

> > > > you get errors from the ONE enum and you have the latest version of

> > > > jit.gl.lua for your platform, let me know.

the "one" enumeration error disappeared but i tried the others and "ZERO"
gave the error.

On Jan 2, 2008 8:11 PM, Wesley Smith  wrote:

> ok, I've updated to beta4.1 with a new windows external fixing the ONE
> enum problem.  Let me know if you still have issues.
> wes
>
> On Jan 2, 2008 9:33 AM, Wesley Smith  wrote:
> > ok, I'll have an update soon.  I'm assuming you're on windows?
> >
> > wes
> >
> >
> > On Jan 2, 2008 9:05 AM, yair reshef  wrote:
> > > ye, i got an error. im on beta4
> > > ob3d_draw_preamble initial: GL Error: Invalid enumeration
> > >
> > >
> > > function init()
> > > --initialize the dispaly list
> > >        if(this.context ~= 0) then
> > >            BuildLists()
> > >    gl.Enable ("BLEND")
> > >
> > >    gl.BlendFunc("ONE", "ONE_MINUS_SRC_ALPHA")
> > >    --gl.ClearColor(1,1,0,1)
> > >        end
> > > end
> > >
> > >
> > >
> > >
> > > On Jan 2, 2008 6:42 PM, Wesley Smith < wesley.hoke@gmail.com> wrote:
> > > >
> > > >
> > > >
> > > >
> > > > On Jan 2, 2008 4:51 AM, Erik Mijwaard < erik@videotroopers.com>
> wrote:
> > > > >
> > > > >
> > > > > try this:
> > > > >
> > > > > gl.BlendFunc(ONE, ONE_MINUS_SRC_ALPHA)
> > > > >
> > > >
> > > > Indeed, this is the way to go.  The Jitter constants for blend
> > > > functions just enumerate the list of enums.  In jit.gl.lua, the
> enums
> > > > have become strings corresponding to the name of the enum.  BTW, if
> > > > you get errors from the ONE enum and you have the latest version of
> > > > jit.gl.lua for your platform, let me know.
> > > >
> > > > wes
> > > >
> > > >
> > > >
> > > >
> > > >
> > >
> > >
> > >
> > >
> >
>

argh. thanks for checking. I had tried doing some "fancy" scripting

on the enum definitions from GLEW and apparently there are several

definitions of ZERO and ONE. I'll get this patched up with a full

On Jan 2, 2008 12:52 PM, yair reshef wrote:

> the "one" enumeration error disappeared but i tried the others and "ZERO"

> On Jan 2, 2008 8:11 PM, Wesley Smith < wesley.hoke@gmail.com> wrote:

> > ok, I've updated to beta4.1 with a new windows external fixing the ONE

> > enum problem. Let me know if you still have issues.

> > On Jan 2, 2008 9:33 AM, Wesley Smith wrote:

> > > ok, I'll have an update soon. I'm assuming you're on windows?

> > > On Jan 2, 2008 9:05 AM, yair reshef wrote:

> > > > ob3d_draw_preamble initial: GL Error: Invalid enumeration

> > > > gl.BlendFunc("ONE", "ONE_MINUS_SRC_ALPHA")

> > > > On Jan 2, 2008 6:42 PM, Wesley Smith < wesley.hoke@gmail.com> wrote:

> > > > > On Jan 2, 2008 4:51 AM, Erik Mijwaard < erik@videotroopers.com >

argh. thanks for checking.  I had tried doing some "fancy" scripting
on the enum definitions from GLEW and apparently there are several
definitions of ZERO and ONE.  I'll get this patched up with a full
update in a few days.

On Jan 2, 2008 12:52 PM, yair reshef  wrote:
> the "one" enumeration error disappeared but i tried the others and "ZERO"
> gave the error.
>
>
>
>
>
> On Jan 2, 2008 8:11 PM, Wesley Smith < wesley.hoke@gmail.com> wrote:
> > ok, I've updated to beta4.1 with a new windows external fixing the ONE
> > enum problem.  Let me know if you still have issues.
> > wes
> >
> >
> >
> >
> > On Jan 2, 2008 9:33 AM, Wesley Smith  wrote:
> > > ok, I'll have an update soon.  I'm assuming you're on windows?
> > >
> > > wes
> > >
> > >
> > > On Jan 2, 2008 9:05 AM, yair reshef  wrote:
> > > > ye, i got an error. im on beta4
> > > > ob3d_draw_preamble initial: GL Error: Invalid enumeration
> > > >
> > > >
> > > > function init()
> > > > --initialize the dispaly list
> > > >        if(this.context ~= 0) then
> > > >            BuildLists()
> > > >    gl.Enable ("BLEND")
> > > >
> > > >    gl.BlendFunc("ONE", "ONE_MINUS_SRC_ALPHA")
> > > >    --gl.ClearColor(1,1,0,1)
> > > >        end
> > > > end
> > > >
> > > >
> > > >
> > > >
> > > > On Jan 2, 2008 6:42 PM, Wesley Smith < wesley.hoke@gmail.com> wrote:
> > > > >
> > > > >
> > > > >
> > > > >
> > > > > On Jan 2, 2008 4:51 AM, Erik Mijwaard < erik@videotroopers.com >
> wrote:
> > > > > >
> > > > > >
> > > > > > try this:
> > > > > >
> > > > > > gl.BlendFunc(ONE, ONE_MINUS_SRC_ALPHA)
> > > > > >
> > > > >
> > > > > Indeed, this is the way to go.  The Jitter constants for blend
> > > > > functions just enumerate the list of enums.  In jit.gl.lua, the
> enums
> > > > > have become strings corresponding to the name of the enum.  BTW, if
> > > > > you get errors from the ONE enum and you have the latest version of
> > > > > jit.gl.lua for your platform, let me know.
> > > > >
> > > > > wes
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