On Sat, Oct 13, 2012 at 8:27 AM, PGGB <[email protected]> wrote:
> I have encountered a new problem.
> Generating and binding vertex arrays seems to be broken with core-profile.
> The problem is that in core-profile it needs to use gl3.h and not gl.h (I had
> the same problem with GLFW in C++) which I assume is the source of the
> problem.
>
> Any ideas how to fix that?
The header only affects what symbols are visible to a C program; the
underlying entry points are the same from Factor's point of view. The
problem in Factor is that it tries to substitute equivalent extension
functions where it can, because under compatibility profile the
extensions are usually equivalent to the standardized. However, in the
case of a core profile context, only the standard entry points are
available. Unfortunately, Apple made the annoying decision to have it
so only `glBindVertexArrayAPPLE` works in compatibility profile, and
only `glBindVertexArray` works in core profile. Since until now Factor
only supported the compatibility profile, it favors the extension
entry points over the standard ones. You can flip it around by going
into `opengl.gl.extensions` and modifying the `GL-FUNCTION:` syntax
word's implementation to `prefix` rather than `suffix` the standard
name to the list of candidates it checks:
```
SYNTAX: GL-FUNCTION:
gl-function-calling-convention
scan-function-name
"{" expect "}" parse-tokens over prefix ! <-- was suffix
gl-function-counter '[ _ _ gl-function-pointer ]
";" scan-c-args define-indirect ;
```
You'll probably have to re-bootstrap for that to take effect. A
longer-term fix would be for the `gl-function-pointer` code to detect
whether it's currently running in a core or compatibility context and
adjust its behavior appropriately.
-Joe
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