Hello all,
The current CVS version does not properly restore attributes with
the glPushAttrib(GL_DEPTH_BUFFER_BIT) call. This applies only to
the Mesa Voodoo driver, software works fine.
I've included a simple test program. It draws a spinning cube, and
if given the command line argument "-pop" will do a (supposedly)
harmless glPushAttrib()/glPopAttrib() pair of calls on startup.
To see the affects of the bug, run this program with the Voodoo
driver with and without the "-pop" argument.
Cheers, and many, many thanks for all of your hard work,
-Pete Ratzlaff <[EMAIL PROTECTED]>
#include <stdio.h>
#include <GL/glut.h>
#define DOWHITE glColor3f(1.f, 1.f, 1.f);
#define DORED glColor3f(1.f, 0.f, 0.f);
#define DOGREEN glColor3f(0.f, 1.f, 0.f);
#define DOBLUE glColor3f(0.f, 0.f, 1.f);
#define FRONT_TOP_RIGHT DOBLUE; glVertex3f( w, w, -w)
#define FRONT_TOP_LEFT DOWHITE; glVertex3f(-w, w, -w)
#define FRONT_BOTTOM_RIGHT DOGREEN; glVertex3f( w, -w, -w)
#define FRONT_BOTTOM_LEFT DORED; glVertex3f(-w, -w, -w)
#define BACK_TOP_RIGHT DOGREEN; glVertex3f( w, w, w)
#define BACK_TOP_LEFT DOGREEN; glVertex3f(-w, w, w)
#define BACK_BOTTOM_RIGHT DOBLUE; glVertex3f( w, -w, w)
#define BACK_BOTTOM_LEFT DOWHITE; glVertex3f(-w, -w, w)
void draw_cube(float w) {
glBegin(GL_QUADS);
/* front */
FRONT_BOTTOM_LEFT;
FRONT_TOP_LEFT;
FRONT_TOP_RIGHT;
FRONT_BOTTOM_RIGHT;
/* left */
BACK_BOTTOM_LEFT;
BACK_TOP_LEFT;
FRONT_TOP_LEFT;
FRONT_BOTTOM_LEFT;
/* back */
BACK_BOTTOM_RIGHT;
BACK_TOP_RIGHT;
BACK_TOP_LEFT;
BACK_BOTTOM_LEFT;
/* right */
FRONT_BOTTOM_RIGHT;
FRONT_TOP_RIGHT;
BACK_TOP_RIGHT;
BACK_BOTTOM_RIGHT;
/* top */
FRONT_TOP_LEFT;
BACK_TOP_LEFT;
BACK_TOP_RIGHT;
FRONT_TOP_RIGHT;
/* bottom */
BACK_BOTTOM_LEFT;
FRONT_BOTTOM_LEFT;
FRONT_BOTTOM_RIGHT;
BACK_BOTTOM_RIGHT;
glEnd();
}
void init(int argc, char **argv) {
int i;
glClearColor(0., 0., 0., 0.);
glShadeModel(GL_SMOOTH);
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LESS);
for (i=1; i<argc; i++) {
if (strcmp(argv[i],"-pop") == 0) {
fprintf(stderr,"glPushAttrib(GL_DEPTH_BUFFER_BIT)/glPopAttrib()\n");
glPushAttrib(GL_DEPTH_BUFFER_BIT);
glDisable(GL_DEPTH_TEST);
glPopAttrib();
}
}
}
void reshape(int w, int h) {
glViewport(0,0,w,h);
}
void display() {
static float xrot = 0.f;
static float yrot = 0.f;
static float zrot = 0.f;
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glRotatef(xrot,yrot,zrot,1.f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
draw_cube(0.2);
glutSwapBuffers();
xrot += 10.f;
yrot += 10.f;
zrot += 10.f;
glutPostRedisplay();
}
void keyboard(unsigned char key, int x, int y) {
switch (key) {
case 27:
exit(0);
break;
default:
break;
}
}
int main(int argc, char **argv) {
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH | GLUT_RGB);
glutCreateWindow(argv[0]);
init(argc,argv);
glutDisplayFunc(display);
glutReshapeFunc(reshape);
glutKeyboardFunc(keyboard);
glutMainLoop();
return 0;
}
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