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/**
* Test frustum clipping w/ glPolygonMode LINE/POINT.
*/
#include <stdio.h>
#include <stdlib.h>
#include <GL/glut.h>
static int win;
static void
Tri(void)
{
glBegin(GL_TRIANGLES);
glColor3f(1, 0, 0); glVertex3f(-1.5, -0.8, 0.0);
glColor3f(0, 1, 0); glVertex3f( 1.5, -0.8, 0.0);
glColor3f(0, 0, 1); glVertex3f( 0.0, 0.9, 0.0);
glEnd();
}
static void
Draw(void)
{
glPointSize(13.0);
glLineWidth(5.0);
glClear(GL_COLOR_BUFFER_BIT);
glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
Tri();
glPolygonMode(GL_FRONT_AND_BACK, GL_POINT);
Tri();
glutSwapBuffers();
}
static void Reshape(int width, int height)
{
glViewport(0, 0, (GLint)width, (GLint)height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-1.0, 1.0, -1.0, 1.0, -1.0, 1.0);
glMatrixMode(GL_MODELVIEW);
}
static void
Key(unsigned char key, int x, int y)
{
if (key == 27) {
glutDestroyWindow(win);
exit(0);
}
else {
glutPostRedisplay();
}
}
static void
Init(void)
{
fprintf(stderr, "GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
fprintf(stderr, "GL_VERSION = %s\n", (char *) glGetString(GL_VERSION));
fprintf(stderr, "GL_VENDOR = %s\n", (char *) glGetString(GL_VENDOR));
fflush(stderr);
}
int
main(int argc, char **argv)
{
glutInitWindowSize(300, 300);
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);
win = glutCreateWindow(*argv);
if (!win) {
return 1;
}
Init();
glutReshapeFunc(Reshape);
glutKeyboardFunc(Key);
glutDisplayFunc(Draw);
glutMainLoop();
return 0;
}
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