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/* Copyright (c) Mark J. Kilgard, 1994. */
/* This program is freely distributable without licensing fees
and is provided without guarantee or warrantee expressed or
implied. This program is -not- in the public domain. */
/* blender renders two spinning icosahedrons (red and green).
The blending factors for the two icosahedrons vary sinusoidally
and slightly out of phase. blender also renders two lines of
text in a stroke font: one line antialiased, the other not. */
#include <GL/glut.h>
#include <stdio.h>
#include <math.h>
GLfloat light0_ambient[] =
{0.2, 0.2, 0.2, 1.0};
GLfloat light0_diffuse[] =
{0.0, 0.0, 0.0, 1.0};
GLfloat light1_diffuse[] =
{1.0, 0.0, 0.0, 1.0};
GLfloat light1_position[] =
{1.0, 1.0, 1.0, 0.0};
GLfloat light2_diffuse[] =
{0.0, 1.0, 0.0, 1.0};
GLfloat light2_position[] =
{-1.0, -1.0, 1.0, 0.0};
float s = 0.0;
GLfloat angle1 = 0.0, angle2 = 0.0;
void
output(GLfloat x, GLfloat y, char *text)
{
char *p;
glPushMatrix();
glTranslatef(x, y, 0);
for (p = text; *p; p++)
glutStrokeCharacter(GLUT_STROKE_ROMAN, *p);
glPopMatrix();
}
void
display(void)
{
static GLfloat amb[] =
{0.4, 0.4, 0.4, 0.0};
static GLfloat dif[] =
{1.0, 1.0, 1.0, 0.0};
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glEnable(GL_LIGHT1);
glDisable(GL_LIGHT2);
amb[3] = dif[3] = cos(s) / 2.0 + 0.5;
glMaterialfv(GL_FRONT, GL_AMBIENT, amb);
glMaterialfv(GL_FRONT, GL_DIFFUSE, dif);
glPushMatrix();
glTranslatef(-0.3, -0.3, 0.0);
glRotatef(angle1, 1.0, 5.0, 0.0);
glCallList(1); /* render ico display list */
glPopMatrix();
glClear(GL_DEPTH_BUFFER_BIT);
glEnable(GL_LIGHT2);
glDisable(GL_LIGHT1);
amb[3] = dif[3] = 0.5 - cos(s * .95) / 2.0;
glMaterialfv(GL_FRONT, GL_AMBIENT, amb);
glMaterialfv(GL_FRONT, GL_DIFFUSE, dif);
glPushMatrix();
glTranslatef(0.3, 0.3, 0.0);
glRotatef(angle2, 1.0, 0.0, 5.0);
glCallList(1); /* render ico display list */
glPopMatrix();
glPushAttrib(GL_ENABLE_BIT);
glDisable(GL_DEPTH_TEST);
glDisable(GL_LIGHTING);
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glLoadIdentity();
gluOrtho2D(0, 1500, 0, 1500);
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
glLoadIdentity();
/* Rotate text slightly to help show jaggies. */
glRotatef(4, 0.0, 0.0, 1.0);
output(200, 225, "This is antialiased.");
glDisable(GL_LINE_SMOOTH);
glDisable(GL_BLEND);
output(160, 100, "This text is not.");
glPopMatrix();
glMatrixMode(GL_PROJECTION);
glPopMatrix();
glPopAttrib();
glMatrixMode(GL_MODELVIEW);
glutSwapBuffers();
}
void
idle(void)
{
angle1 = (GLfloat) fmod(angle1 + 0.8, 360.0);
angle2 = (GLfloat) fmod(angle2 + 1.1, 360.0);
s += 0.05;
glutPostRedisplay();
}
void
visible(int vis)
{
if (vis == GLUT_VISIBLE)
glutIdleFunc(idle);
else
glutIdleFunc(NULL);
}
int
main(int argc, char **argv)
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
glutCreateWindow("blender");
glutDisplayFunc(display);
glutVisibilityFunc(visible);
glNewList(1, GL_COMPILE); /* create ico display list */
glutSolidIcosahedron();
glEndList();
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
glLightfv(GL_LIGHT0, GL_AMBIENT, light0_ambient);
glLightfv(GL_LIGHT0, GL_DIFFUSE, light0_diffuse);
glLightfv(GL_LIGHT1, GL_DIFFUSE, light1_diffuse);
glLightfv(GL_LIGHT1, GL_POSITION, light1_position);
glLightfv(GL_LIGHT2, GL_DIFFUSE, light2_diffuse);
glLightfv(GL_LIGHT2, GL_POSITION, light2_position);
glEnable(GL_DEPTH_TEST);
glEnable(GL_CULL_FACE);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glEnable(GL_LINE_SMOOTH);
glLineWidth(2.0);
glMatrixMode(GL_PROJECTION);
gluPerspective( /* field of view in degree */ 40.0,
/* aspect ratio */ 1.0,
/* Z near */ 1.0, /* Z far */ 10.0);
glMatrixMode(GL_MODELVIEW);
gluLookAt(0.0, 0.0, 5.0, /* eye is at (0,0,5) */
0.0, 0.0, 0.0, /* center is at (0,0,0) */
0.0, 1.0, 0.); /* up is in positive Y direction */
glTranslatef(0.0, 0.6, -1.0);
glutMainLoop();
return 0; /* ANSI C requires main to return int. */
}
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