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STR #3450
| Application: | FLTK Library |
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| Status: | 1 - Closed w/Resolution |
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| Priority: | 1 - Request for Enhancement, e.g. asking for a feature |
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| Scope: | 3 - Applies to all machines and operating systems |
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| Subsystem: | OpenGL |
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| Summary: | Draw text with OpenGL using textures on all platforms |
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| Version: | 1.4-feature |
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| Created By: | manolo |
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| Assigned To: | manolo |
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| Fix Version: | 1.4-current (SVN: v12650) |
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| Update Notification: | |
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Trouble Report Files:
Trouble Report Comments:
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| #1 | manolo
07:47 Jan 19, 2018 |
| The attached patch gives FLTK 1.4 the ability to draw text under OpenGL
using textures, if the hardware supports GL_EXT_texture_rectangle.
Benefits are:
- antialiased text (requires Xft under X11 platform)
- full Unicode support (requires Xft+Pango under X11 platform)
- cross-platform implementation of the texture approach to text drawing.
The new static member function Fl::draw_GL_text_with_textures(0);
allows to deactivate text drawing with textures, if desired. | |
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| #2 | AlbrechtS
11:34 Jan 26, 2018 |
| Probaby related: STR #3440.
http://www.fltk.org/str.php?L3440 | |
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| #3 | alpopa
12:09 Jan 27, 2018 |
| Does the patch work with FL_OPENGL3 ? | |
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| #4 | manolo
14:01 Jan 27, 2018 |
| Q: Does the patch work with FL_OPENGL3 ?
No. The patch uses glBegin()/glEnd(), that is,
follows the OpenGL 1 logic.
Contribution welcome to devise an API adequate
for OpenGL3 and its shaders logic. | |
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| #5 | AlbrechtS
11:21 Feb 05, 2018 |
| I updated the patch to svn-current (r12646) and compiled it under Linux. It worked flawlessly with Xft + Pango, but it failed if configured w/o Pango (using CMake). I'm aware that the result would not be the same w/o Pango, but it should compile and link.
Other than that: looks good under Linux with xft + Pango.
Updated patch file: see GLtextureV3_r12646.patch
I didn't try to investigate the error (no member named 'font' in 'Fl_Font_Descriptor') but I hope my updated patch file helps.
Full compiler error message(s):
../../src/drivers/Xlib/Fl_Xlib_Graphics_Driver_font_xft.cxx:735:40: error: no member named 'font' in 'Fl_Font_Descriptor'
XftTextExtents32(fl_display, desc->font, (XftChar32 *)buffer, n, extents);
~~~~ ^
../../src/drivers/Xlib/Fl_Xlib_Graphics_Driver_font_xft.cxx:740:52: error: no member named 'font' in 'Fl_Font_Descriptor'
if (font_descriptor()) return font_descriptor()->font->ascent + font_descriptor()->font->descent;
~~~~~~~~~~~~~~~~~ ^
../../src/drivers/Xlib/Fl_Xlib_Graphics_Driver_font_xft.cxx:740:86: error: no member named 'font' in 'Fl_Font_Descriptor'
if (font_descriptor()) return font_descriptor()->font->ascent + font_descriptor()->font->descent;
~~~~~~~~~~~~~~~~~ ^
../../src/drivers/Xlib/Fl_Xlib_Graphics_Driver_font_xft.cxx:745:52: error: no member named 'font' in 'Fl_Font_Descriptor'
if (font_descriptor()) return font_descriptor()->font->descent;
~~~~~~~~~~~~~~~~~ ^
../../src/drivers/Xlib/Fl_Xlib_Graphics_Driver_font_xft.cxx:759:38: error: no member named 'font' in 'Fl_Font_Descriptor'
XftTextExtents32(fl_display, desc->font, str, n, &i);
~~~~ ^
../../src/drivers/Xlib/Fl_Xlib_Graphics_Driver_font_xft.cxx:819:55: error: no member named 'font' in 'Fl_Font_Descriptor'
XftDrawString32(draw_, &color, font_descriptor()->font, x+offset_x_*scale_+line_delta_, y+offset_y_*scale_+line_delta_, (XftChar32 *)buffer, n);
~~~~~~~~~~~~~~~~~ ^
../../src/drivers/Xlib/Fl_Xlib_Graphics_Driver_font_xft.cxx:861:53: error: no member named 'font' in 'Fl_Font_Descriptor'
XftDrawString32(draw_, &color, font_descriptor()->font, x+offset_x_*scale_+line_delta_, y+offset_y_*scale_+line_delta_, (FcChar32 *)str, n);
~~~~~~~~~~~~~~~~~ ^
../../src/drivers/Xlib/Fl_Xlib_Graphics_Driver_font_xft.cxx:1042:26: error: no member named 'font' in 'Fl_Font_Descriptor'
fl_xftfont = (void*)f->font;
~ ^
8 errors generated. | |
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| #6 | manolo
12:56 Feb 05, 2018 |
| Attached GLtextureV4.patch restores building without pango
and is against the latest code in the svn repository, r.12646. | |
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| #7 | AlbrechtS
14:44 Feb 05, 2018 |
| Thanks for the update - tested and works.
MinGW: OK
Visual Studio 2015: OK
Cygwin: OK with the small patch attached
Ubuntu 1604 (Xft): OK
Ubuntu 1604 (Xft + Pango): OK
Uploaded patch GLtextureV4_cygwin.patch must be applied after GLtextureV4.patch and uses the same cast used with Xft w/o Pango. | |
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| #8 | AlbrechtS
14:52 Feb 05, 2018 |
| FYI: currently we can only support Cygwin with X11 (needs Cygwin dll). There's no <Cygwin + GDI> configuration unless you use "cross compilation" with native MinGW or MinGW-w64 compilers. | |
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| #9 | AlbrechtS
10:01 Feb 06, 2018 |
| +1 for both (combined) patches:
GLtextureV4.patch + GLtextureV4_cygwin.patch | |
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| #10 | manolo
07:43 Feb 07, 2018 |
| Fixed in Subversion repository. | |
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