[PD] new luagl

[marius schebella]

Thomas Grill wrote:
> A more refined version which also supports symbolic OpenGL constants as in
> [gl MatrixMode TEXTURE]
> and lists to the first inlet with all parameters as in
> [1 0 0(
> |
> [gl Color 0 0 0]
> 
> gr~~~

what is the difference/advantage between the lua version and the GEMgl 
objects? aren't the pd connections the one thing that make gem slower 
compared to lua? afaict lua is extremely fast with code loops, I thought 
that's because gem has this overhead of the pd messaging system?
anyway, thanks for posting the code!
marius.



> 
> 
> 
> 
> 
> Am 25.07.2008 um 23:37 schrieb Thomas Grill:
> 
>> Hi all,
>> attached is the file gl.pd_lua (tested with 0.41-4) which uses some 
>> special lua features to represent a generic opengl function for GEM.
>> GL objects can be created as e.g. [gl Color 1 1 0] or [gl Rect 0 0 400 
>> 300]
>> gr~~~
>>
>> <gl.pd_lua>
>>
>>
>> Am 25.07.2008 um 21:39 schrieb marius schebella:
>>
>>>
>>>> Thomas Grill wrote:
>>>>> Hi Marius,
>>>>> which version of "luagl" are you referring to?
>>>>>
>>>>> I have the following here (version 1.01):
>>>>> *  LuaGL - an OpenGL binding for Lua
>>>>> *  2003-2004(c) Fabio Guerra, Cleyde Marlyse
>>>>> *  www.luagl.sourceforge.net
>>>>>
>>>>> as it's designed by default, lua scripts wouldn't require 'luagl' 
>>>>> but rather 'opengl', but this can be changed easily.
>>>>> Then, OpenGL functions reside in a lua library called gl, which 
>>>>> means that the are called via gl.Begin etc.
>>>>> I haven't tried from within pdlua, but it seems to basically work 
>>>>> in the lua interpreter
>>>>>
>>>
>>> I keep getting the same nil error, I think my code has errors, but I 
>>> am not sure where/which.
>>>
>>> require ("opengl")
>>>
>>> local basicgl = pd.Class:new():register("basicgl")
>>>
>>> function basicgl:initialize(name, atoms)
>>>  self.inlets = 2
>>>  pd.post(tostring(self))
>>>  return true
>>> end
>>>
>>> function basicgl:in_1_gem_state(atoms)
>>>     self:render()
>>> end
>>>
>>> function basicgl:render()
>>>     gl.Begin(1)
>>>     gl.Vertex(-1, 1, 0)
>>>     gl.Vertex(1, 1, 0)
>>>     gl.Vertex(1, -1, 0)
>>>     gl.Vertex(-1, -1, 0)
>>>     gl.End()
>>> end
>>>
>>> error: lua: error in dispatcher:
>>> [string "basicgl"]:16: attempt to index global 'gl' (a nil value)
>>>
>>> marius.
>>>
>>>>> gr~~~
>>>>>
>>>>>
>>>>> Am 19.07.2008 um 20:14 schrieb marius schebella:
>>>>>
>>>>>> hi,
>>>>>> here's the code that I am trying to run:
>>>>>> require 'luagl'
>>>>>>
>>>>>> local testgl1 = pd.Class:new():register("testgl1")
>>>>>>
>>>>>> function testgl1:initialize(name, atoms)
>>>>>>  self.inlets = 2
>>>>>>  self.max = 1
>>>>>>  pd.post(tostring(self))
>>>>>>  return true
>>>>>> end
>>>>>>
>>>>>> function testgl1:in_1(sel, atoms)
>>>>>>  if sel == "gem_state" then
>>>>>>     testgl1:render(self)
>>>>>>  end
>>>>>> end
>>>>>>
>>>>>> function testgl1:in_2_float(f)
>>>>>>  self.max = math.abs(f)
>>>>>>  pd.post(self.max)
>>>>>> end
>>>>>>
>>>>>> function testgl1:render(myself)
>>>>>>  max = math.max(myself.max, 1)
>>>>>>  glBegin(GL_LINE_LOOP)
>>>>>>  for i=1,max do
>>>>>>      r = math.random()
>>>>>>      g = math.random()
>>>>>>      b = math.random()
>>>>>>      glColor3d(r, g, b)
>>>>>>      glVertex2d(math.random(-400,400)/100, math.random(-400,400)/100)
>>>>>>  end
>>>>>>  glEnd()
>>>>>> end
>>>>>>
>>>>>> here's the console printout:
>>>>>> error: lua: error in dispatcher:
>>>>>> [string "testgl1"]:25: attempt to call global 'glBegin' (a nil value)
>>>>>> I think this code was running in lua0.3..
>>>>>> thanks,
>>>>>> marius.
>>>>>>
>>>>>> _______________________________________________
>>>>>> Pd-list at iem.at mailing list
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>>>>>
>>>>> Thomas Grill
>>>>> http://grrrr.org
>>>>>
>>>>>
>>>
>>
>> Thomas Grill
>> http://grrrr.org
>>
>>
>> _______________________________________________
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> 
> Thomas Grill
> http://grrrr.org
> 
> 
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