blender.c
上传用户:xk288cn
上传日期:2007-05-28
资源大小:4876k
文件大小:4k
- /* 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. */
- }