Hi all,
This is how it was done in simul/gl/glut.c, which worked with (32-bit)
picoLisp-2.3.5:
// (glut:BitmapCharacter 'fontNum 'character) -> T
any BitmapCharacter(any ex) {
void* font;
int fontNum;
int character;
fontNum = (int)evCnt(ex, cdr(ex));
character = (int)evCnt(ex, cddr(ex));
switch (fontNum) {
// These GLUT_BITMAP values are system dependent.
case 2: font = GLUT_BITMAP_9_BY_15; break;
case 3: font = GLUT_BITMAP_8_BY_13; break;
case 4: font = GLUT_BITMAP_TIMES_ROMAN_10; break;
case 5: font = GLUT_BITMAP_TIMES_ROMAN_24; break;
case 6: font = GLUT_BITMAP_HELVETICA_10; break;
case 7: font = GLUT_BITMAP_HELVETICA_12; break;
case 8: font = GLUT_BITMAP_HELVETICA_18; break;
default: font = GLUT_BITMAP_TIMES_ROMAN_24; break;
}
//printf("BitmapCharacter, font = %10p\n", font);
glutBitmapCharacter(font, character);
return T;
}
// (glut:StrokeCharacter 'mono 'character) -> T
any StrokeCharacter(any ex) {
void* font = GLUT_STROKE_ROMAN;
int mono;
int character;
mono = (int)evCnt(ex, cdr(ex)); // correct? - jk
character = (int)evCnt(ex, cddr(ex));
if (mono) font = GLUT_STROKE_MONO_ROMAN;
glutStrokeCharacter(font, character);
return T;
}
.. and this is how it was called in my china.l:
(glut:BitmapCharacter FontNum (char Chr))
I know that parameters in calls to C library functions are done quite
differently nowadays, in pil64.
/Jon
On 11/8/12 9:43 PM, Jorge Acereda wrote:
On Nov 8, 2012, at 9:09 PM, Alexander Burger wrote:
Hi Jon,
work to make OpenGl.l a little more complete (lots missing). The problem
I have right now, is with glutBitmapCharacter and glutStrokeCharacter;
they give me "Segmentation fault", and I suspect they'll fail on Linux
as well.
Yes. At least 'glutStrokeCharacter' does.
I'm wondering whether (or why)
(glutStrokeCharacter 2 (char "A"))
is correct, as the corresponding C function signature is
void glutStrokeCharacter(void *font, int character);
i.e. '2' is a "pointer".
#if defined(_WIN32)
/* Stroke font constants (use these in GLUT program). */
#define GLUT_STROKE_ROMAN ((void*)0)
#define GLUT_STROKE_MONO_ROMAN ((void*)1)
..
#else
..
#define GLUT_STROKE_ROMAN (&glutStrokeRoman)
#define GLUT_STROKE_MONO_ROMAN (&glutStrokeMonoRoman)
..
#endif
I faintly remember I saw this usage before (perhaps in your OpenGl /
ErsatzLisp code?), and it seems passing '2' as a pointer is legal use.
But then I have no idea why it crashes.
Cheers,
- Alex
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