Re: [Freeglut-developer] glutBitmapCharacter / glList access on Linux

[John F. F. <joh...@cy...>]

Clemens,

     Thank you very much for your interest in "freeglut" and for your 
error reports.  It appears at the moment that the error is in the 
"i965_dri.so" library rather than in "freeglut".  What is this library 
and what does it do?

         - John F.

On 3/27/2012 4:10 AM, Clemens Schäfermeier wrote:
> Hi,
> I did some further testing about the previously mentioned issue. Here's a
> minimal file which also raises the error:
> --------------------------------------
> #include<stdio.h>
> #include<stdlib.h>
> #include<GL/freeglut.h>
>
> void keyboard(unsigned char key, const int x, const int y);
> void display(void);
>
> int main(int argc, char** argv)
> {
> glutInit(&argc,argv);
> glutInitDisplayMode(GLUT_DOUBLE|GLUT_RGBA|GLUT_DEPTH|GLUT_MULTISAMPLE);
> glutCreateWindow("GLUT Test");
>
> glEnable(GL_DEPTH_TEST);
> glDepthFunc(GL_LEQUAL);
>
> glEnable(GL_BLEND);
> glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
>
> glClearColor(0.,0.,0.,0.);
> glClearDepth(1.);
>
> glutSetOption(GLUT_ACTION_ON_WINDOW_CLOSE,GLUT_ACTION_GLUTMAINLOOP_RETURNS);
> glutKeyboardFunc(&keyboard);
> glutDisplayFunc(&display);
> glutMainLoop();
>
> return EXIT_SUCCESS;
> }
>
> void keyboard(unsigned char key, const int x, const int y)
> {
> switch (key)
> {
> 	case 27:
> 	glutLeaveMainLoop();
> 	break;
> }
> }
>
> void display()
> {
> glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
>
> glMatrixMode(GL_PROJECTION);
> glLoadIdentity();
> glOrtho(-5,5,-5,5,-2,2);
>
> glColor3f(1.,0.,0.);
>
> glBegin(GL_POLYGON);
> 	glVertex2d(-.5,.5);
> 	glVertex2d(-.5,-.5);
> 	glVertex2d(.5,-.5);
> 	glVertex2d(.5,.5);
> glEnd();
>
> glRasterPos3d(1.05,0.,0.);
> glutBitmapCharacter(GLUT_BITMAP_8_BY_13,'x');
> glRasterPos3d(0.,0.,1.05);
> glutBitmapCharacter(GLUT_BITMAP_8_BY_13,'y');
> glRasterPos3d(0.,1.05,0.);
> glutBitmapCharacter(GLUT_BITMAP_8_BY_13,'z');
>
> glFlush();
> glutSwapBuffers();
> }
> --------------------------------------
>
> If the
> glEnable(GL_DEPTH_TEST);
> call is commented out, there's no error from valgrind. I certainly missed
> something about the GL_DEPTH_TEST which is not freeglut specific?! In that
> case, sorry for my mails...
>
> Clemens
>
> PS: I've attached an updated summary of the valgrind report.
>
>
> ==2684== Invalid write of size 1
> ==2684==    at 0x4027418: memcpy (mc_replace_strmem.c:497)
> ==2684==    by 0x4A178B5: ??? (in /usr/lib/dri/i965_dri.so)
> ==2684==    by 0x4071C5A: glutBitmapCharacter (freeglut_font.c:122)
> ==2684==    by 0x4079A61: fghcbDisplayWindow (freeglut_main.c:207)
> ==2684==  Address 0xb7726007 is not stack'd, malloc'd or (recently) free'd
>
> ==2684== Invalid write of size 1
> ==2684==    at 0x4027420: memcpy (mc_replace_strmem.c:497)
> ==2684==    by 0x4A178B5: ??? (in /usr/lib/dri/i965_dri.so)
> ==2684==    by 0x4071C5A: glutBitmapCharacter (freeglut_font.c:122)
> ==2684==    by 0x4079A61: fghcbDisplayWindow (freeglut_main.c:207)
> ==2684==  Address 0xb7726006 is not stack'd, malloc'd or (recently) free'd
>
> ==2684== Invalid write of size 1
> ==2684==    at 0x4027429: memcpy (mc_replace_strmem.c:497)
> ==2684==    by 0x4A178B5: ??? (in /usr/lib/dri/i965_dri.so)
> ==2684==    by 0x4071C5A: glutBitmapCharacter (freeglut_font.c:122)
> ==2684==    by 0x4079A61: fghcbDisplayWindow (freeglut_main.c:207)
> ==2684==  Address 0xb7726005 is not stack'd, malloc'd or (recently) free'd
>
> ==2684== Invalid write of size 1
> ==2684==    at 0x4027432: memcpy (mc_replace_strmem.c:497)
> ==2684==    by 0x4A178B5: ??? (in /usr/lib/dri/i965_dri.so)
> ==2684==    by 0x4071C5A: glutBitmapCharacter (freeglut_font.c:122)
> ==2684==    by 0x4079A61: fghcbDisplayWindow (freeglut_main.c:207)
> ==2684==  Address 0xb7726004 is not stack'd, malloc'd or (recently) free'd
>
> ==2684== Invalid write of size 4
> ==2684==    by 0x4A178B5: ??? (in /usr/lib/dri/i965_dri.so)
> ==2684==    by 0x4071C5A: glutBitmapCharacter (freeglut_font.c:122)
> ==2684==    by 0x4079A61: fghcbDisplayWindow (freeglut_main.c:207)
> ==2684==    by 0x407D46E: fgEnumWindows (freeglut_structure.c:396)
> ==2684==  Address 0xb7726040 is not stack'd, malloc'd or (recently) free'd
>
>
>
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