El Viernes, 13 de Febrero de 2004 16:22, Brian Paul escribió:
> No, not glPushAttrib(). glPopAttrib() is where the problem probably
> occurs.
Sorry, my mistake O:-)
> Great.
I attach a very stupid program. It draws two cubes (one big blue, and
another red small). Press 'r' to rotate both. I use
glPushAttrib(GL_CURRENT_BIT)/glPopAttrib() to save/restore the current
color. I've successfully tested it with nvidia drivers (the big cube
remains being blue). When I try on my ATI Radeon Mobility (iBook 2.2) the
big cube starts blue, but once you rotate goes red (and it shouldn't).
I just hope it helps.
/* glPushAttrib(), glPopAttrib() tiny test */
#include <GL/glut.h>
GLfloat angle = 0.0;
int win_w, win_h;
void keyboard(unsigned char, int, int);
void reshape(int, int);
void display(void);
int main(int argc, char **argv)
{
/* libglut stuff */
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE | GLUT_DEPTH);
glutInitWindowSize(500, 500);
glutInitWindowPosition(70, 70);
glutCreateWindow("Tiny test");
glutKeyboardFunc(keyboard);
glutReshapeFunc(reshape);
glutDisplayFunc(display);
/* Minimal Enables */
glEnable(GL_DEPTH_TEST);
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
glEnable(GL_COLOR_MATERIAL);
glColorMaterial(GL_FRONT, GL_AMBIENT_AND_DIFFUSE);
glClearColor(1.0, 1.0, 1.0, 1.0);
/* Initial color is blue */
glColor3f(0.0, 0.0, 1.0);
/* Set up projection matrix */
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-5.0, 5.0, -5.0, 5.0, -5.0, 5.0);
glMatrixMode(GL_MODELVIEW);
glutMainLoop();
return 0;
}
void keyboard(unsigned char key, int x, int y)
{
switch (key) {
case 'r': /* Rotate cubes */
angle += 3.0;
if (angle > 360.0)
angle -= 360.0;
break;
case 27:
exit(0);
}
glutPostRedisplay();
}
void reshape(int w, int h)
{
win_w = w;
win_h = h;
}
void display(void)
{
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
/* Set viewport for blue cube */
glViewport(0, 0, win_w, win_h);
glLoadIdentity();
glRotatef(angle, 1.0, 1.0, 1.0);
glutSolidCube(3.5);
/* Set smaller viewport for red cube */
glViewport(0, 0, win_w/5, win_h/5);
glLoadIdentity();
glRotatef(angle, -1.0, 1.0, 1.0);
glPushAttrib(GL_CURRENT_BIT); /* Save blue color */
glColor3f(1.0, 0.0, 0.0);
glutSolidCube(3.5);
glPopAttrib(); /* Restore blue color */
glFlush();
glutSwapBuffers();
}
