First of all thanks a lot for the in-depth answer. It's kinda tough to get
started with Factor because of the relative lack of examples (though the extra
workspace has been very helpful), but I am making fast progress.
I haven't been able to get OGL 3.2 to work though. I added the core-profile
symbol in ui.pixel-formats, then I added in cocoa.views:
CONSTANT: NSOpenGLPFAOpenGLProfile 99
CONSTANT: NSOpenGLProfileVersionLegacy 0x1000
CONSTANT: NSOpenGLProfileVersion3_2Core 0x3200
and in ui.backend.cocoa to the PIXEL-FORMAT-ATTRIBUTE-TABLE:
{ core-profile { $ NSOpenGLPFAOpenGLProfile $
NSOpenGLProfileVersion3_2Core } }
Now I just get a invalid-pixel-format-attributes error.
OpenGL 3.2 would be nice to have for the newer GLSL version, 1.20 seems very
restrictive.
In the meantime I have been continuing on my Windows machine and run into
anther problem:
http://paste.factorcode.org/paste?id=2777
This is basically just a more or less straight port from this tutorial
(https://bitbucket.org/alfonse/gltut/src/3ee6f3dd04a7/Tut%2001%20Hello%20Triangle/tut1.cpp?at=default).
The line that bothers Factor is:
0 4 GL_FLOAT GL_FALSE 0 0 glVertexAttribPointer
To be exact the last parameter, which yields this error:
Generic word underlying>> does not define a method for the fixnum class.
Dispatching on object: 0
I'm not sure exactly what it is expecting since the word glVertexAttribPointer
is a few layers removed from the plain C function which makes it hard for me to
understand. Stepping through everything just leads through a hundred utility
words I don't know the effect of.
Anyways I hope someone has an answer to this, I searched the whole Factor
source code and couldn't find a single use of glVertexAttribPointer to
reference. Thank you very much in advance!
On 11.10.2012, at 18:40, Joe Groff <arc...@gmail.com> wrote:
> On Thu, Oct 11, 2012 at 8:39 AM, PGGB <grizzlysc...@gmail.com> wrote:
>> I've been messing around with Factor the last couple weeks and it is a lot
>> of fun. At the same time I am learning some graphics programming with
>> OpenGL. Now even though version 3.2 was added with Lion, the windows Factor
>> creates only seem to allow version 2.1.
>>
>> I was looking for a way to add the required flag but my knowledge of both
>> Cocoa and Factor is to small to really know what I am doing. Does anyone
>> have any suggestions?
>
> OS X only supports core profile OpenGL 3.2, so to get a 3.2-capable
> context, you have to ask for one explicitly by initializing the
> NSOpenGLPixelFormat with these attributes:
>
> ```
> NSOpenGLPixelFormatAttribute pfa[] = {
> /* ... other attributes ... */
> NSOpenGLPFAOpenGLProfile, NSOpenGLProfileVersion3_2Core,
> 0
> };
> ```
>
> You could make this work in Factor by adding a `core-profile` symbol
> to `ui.pixel-formats`, and updating `ui.backend.cocoa` to use those
> pixel format attributes. You could then create a core profile window
> with this code:
>
> ```
> USE: ui.gadgets.worlds.null
> <world-attributes>
> "Core Profile World" >>title
> null-world >>world-class
> {
> windowed
> double-buffered
> backing-store
> T{ depth-bits f 24 }
> core-profile
> } >>pixel-format-attributes
> { 512 512 } >>pref-dim
> f swap open-window*
> ```
>
> That will open a window and leave the window object on the listener's
> stack. You can then use `into-window` to send GL commands to the
> window interactively:
>
> ```
> dup [ 1.0 1.0 0.0 0.0 glClearColor GL_COLOR_BUFFER_BIT glClear ] into-window
> ```
>
> Note that, although compatibility profile contexts in OS X report 2.1,
> on most 3.2-capable graphics cards, all of the 3.2 features are also
> supported by ARB extensions to 2.1, and Factor's OpenGL binding is
> smart enough to substitute ARB or EXT entry points for standardized
> entry points when the standard entry points are unavailable. If you
> can't get core profile mode to work, you should be able to write 3.2
> code and have it still just work, if your graphics driver supports
> 3.2.
>
> -Joe
>
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