http://bugs.freedesktop.org/show_bug.cgi?id=25164
Summary: glBitmap directly to the front buffer when using double-
buffering has no effect
Product: Mesa
Version: 7.6
Platform: x86 (IA32)
OS/Version: Linux (All)
Status: NEW
Severity: normal
Priority: medium
Component: Mesa core
AssignedTo: [email protected]
ReportedBy: [email protected]
Writing with glBitmap directly to the front buffer when using double-buffering
seems to have no effect. Other routines such as GL_QUADS seem to work.
Configuration:
* ATI radeon X1400 (R520), but the same behavior is observed with
LIBGL_ALWAYS_INDIRECT=1
* Fedora 12-packaged mesa-libGL-7.6-0.13.
I am using the front buffer directly for a mouse tracker and don't want to have
to fully redraw to avoid excessive slowness when run over remote X.
Code example:
glDrawBuffer(GL_FRONT);
/* Erase background first */
glColor3f(0.0,0.0,0.0);
glBegin(GL_QUADS);
glVertex2i(poslinex,posliney);
glVertex2i(poslinex+poslinewidth,posliney);
glVertex2i(poslinex+poslinewidth,posliney+poslineheight);
glVertex2i(poslinex,posliney+poslineheight);
glEnd();
/* draw a character */
glColor3f(1.0,1.0,1.0);
glRasterPos2i(poslinex,posliney+poslineheight);
glutBitmapCharacter(TextFont,'f'); /* thin wrapper over glBitmap() */
glFlush();
glDrawBuffer(GL_BACK);
Expected result: draw an 'f' over a black rectangle
Actual result: Black rectangle but no 'f'.
Removing the glDrawBuffer() calls and adding
glutSwapBuffers() at the end solves the problem and the expected
result is achieved.
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