screendoor.c
上传用户:xk288cn
上传日期:2007-05-28
资源大小:4876k
文件大小:19k
- /* Copyright (c) Mark J. Kilgard, 1996. */
- /* 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. */
- /* screendoor demonstrates "screen door" transparency using
- OpenGL's polygon stipple feature. */
- #include <GL/glut.h>
- #include <stdlib.h>
- #include <stdio.h>
- #define TORUS 1
- #define TETRAHEDRON 2
- #define ICOSAHEDRON 3
- /* Screen door transparency stipple patterns, originally generated by
- Tim Hall (tjh@world.std.com) based on the 4x4 dither matrix
- described in "Computer Graphics Principles and Practice, 2nd ed." in
- the "Halftone Approximation" section (13.1.2). Each 4x4 pattern is
- replicated over OpenGL's 32x32 pixel stipple pattern. mjk converted
- Tim's patterns to be expressed as GLubytes instead of unsigned ints
- to avoid byte ordering problems. */
- #if 0 /* Comment containing C comments. */
- Example usage:
- /* Assumes default unpack pixel store settings; see glPixelStore */
- glEnable(GL_POLYGON_STIPPLE);
- glPolygonStipple(stippleMask[0]); /* 0% opaqueness */
- glPolygonStipple(stippleMask[8]); /* 50% opaqueness */
- glPolygonStipple(stippleMask[16]); /* 100% opaqueness */
- #endif
- const GLubyte stippleMask[17][128] =
- {
- /* NOTE: 0% opaqueness is faster to set and probably faster to render with:
- glDisable(GL_POLYGON_STIPPLE);
- glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE); */
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- 0xff, 0xff, 0xff, 0xff, 0xdd, 0xdd, 0xdd, 0xdd, 0xff, 0xff, 0xff, 0xff, 0x77, 0x77, 0x77, 0x77,
- 0xff, 0xff, 0xff, 0xff, 0xdd, 0xdd, 0xdd, 0xdd, 0xff, 0xff, 0xff, 0xff, 0x77, 0x77, 0x77, 0x77,
- 0xff, 0xff, 0xff, 0xff, 0xdd, 0xdd, 0xdd, 0xdd, 0xff, 0xff, 0xff, 0xff, 0x77, 0x77, 0x77, 0x77,
- 0xff, 0xff, 0xff, 0xff, 0xdd, 0xdd, 0xdd, 0xdd, 0xff, 0xff, 0xff, 0xff, 0x77, 0x77, 0x77, 0x77,
- 0xff, 0xff, 0xff, 0xff, 0xdd, 0xdd, 0xdd, 0xdd, 0xff, 0xff, 0xff, 0xff, 0x77, 0x77, 0x77, 0x77,
- 0xff, 0xff, 0xff, 0xff, 0xdd, 0xdd, 0xdd, 0xdd, 0xff, 0xff, 0xff, 0xff, 0x77, 0x77, 0x77, 0x77},
- {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x77, 0x77, 0x77, 0x77,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x77, 0x77, 0x77, 0x77,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x77, 0x77, 0x77, 0x77,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x77, 0x77, 0x77, 0x77,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x77, 0x77, 0x77, 0x77,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x77, 0x77, 0x77, 0x77,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x77, 0x77, 0x77, 0x77,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x77, 0x77, 0x77, 0x77},
- /* NOTE: 100% opaqueness is faster to set and probably faster to render with:
- glDisable(GL_POLYGON_STIPPLE); */
- {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff},
- };
- GLfloat angle = 20.0;
- int torusStipple = 4, icoStipple = 8, tetraStipple = 16;
- /* Initialize material property and light source. */
- void
- myinit(void)
- {
- GLfloat light_ambient[] =
- {0.2, 0.2, 0.2, 1.0};
- GLfloat light_diffuse[] =
- {1.0, 1.0, 1.0, 1.0};
- GLfloat light_specular[] =
- {1.0, 1.0, 1.0, 1.0};
- GLfloat light_position[] =
- {1.0, 1.0, 1.0, 0.0};
- glClearColor(0.49, 0.62, 0.75, 0.0);
- glLightfv(GL_LIGHT0, GL_AMBIENT, light_ambient);
- glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse);
- glLightfv(GL_LIGHT0, GL_SPECULAR, light_specular);
- glLightfv(GL_LIGHT0, GL_POSITION, light_position);
- glEnable(GL_LIGHT0);
- glDepthFunc(GL_LESS);
- glEnable(GL_DEPTH_TEST);
- glEnable(GL_LIGHTING);
- glEnable(GL_CULL_FACE);
- glEnable(GL_POLYGON_STIPPLE);
- glNewList(TORUS, GL_COMPILE);
- glutSolidTorus(0.275, 0.85, 10, 15);
- glEndList();
- glNewList(TETRAHEDRON, GL_COMPILE);
- glutSolidTetrahedron();
- glEndList();
- glNewList(ICOSAHEDRON, GL_COMPILE);
- glutSolidIcosahedron();
- glEndList();
- }
- void
- display(void)
- {
- glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
- glPushMatrix();
- glScalef(1.3, 1.3, 1.3);
- glRotatef(angle, 1.0, 0.0, 0.0);
- glPushMatrix();
- glTranslatef(-0.75, -0.5, 0.0);
- glRotatef(270.0, 1.0, 0.0, 0.0);
- glPolygonStipple(stippleMask[tetraStipple]);
- glCallList(TETRAHEDRON);
- glPopMatrix();
- glPushMatrix();
- glTranslatef(-0.75, 0.5, 0.0);
- glRotatef(90.0, 1.0, 0.0, 0.0);
- glPolygonStipple(stippleMask[torusStipple]);
- glCallList(TORUS);
- glPopMatrix();
- glPushMatrix();
- glTranslatef(0.75, 0.0, -1.0);
- glPolygonStipple(stippleMask[icoStipple]);
- glCallList(ICOSAHEDRON);
- glPopMatrix();
- glPopMatrix();
- glutSwapBuffers();
- }
- void
- reshape(int w, int h)
- {
- glViewport(0, 0, w, h);
- glMatrixMode(GL_PROJECTION);
- glLoadIdentity();
- if (w <= h)
- glOrtho(-2.5, 2.5, -2.5 * (GLfloat) h / (GLfloat) w,
- 2.5 * (GLfloat) h / (GLfloat) w, -10.0, 10.0);
- else
- glOrtho(-2.5 * (GLfloat) w / (GLfloat) h,
- 2.5 * (GLfloat) w / (GLfloat) h, -2.5, 2.5, -10.0, 10.0);
- glMatrixMode(GL_MODELVIEW);
- }
- void
- torusTransparency(int value)
- {
- torusStipple = value;
- glutPostRedisplay();
- }
- void
- icoTransparency(int value)
- {
- icoStipple = value;
- glutPostRedisplay();
- }
- void
- tetraTransparency(int value)
- {
- tetraStipple = value;
- glutPostRedisplay();
- }
- void
- noop(int value)
- {
- switch(value) {
- case 1:
- angle -= 45;
- break;
- case 2:
- angle += 45;
- break;
- case 666:
- exit(0);
- }
- glutPostRedisplay();
- }
- void
- createTransparencyMenu(void)
- {
- char label[20];
- int i;
- for (i = 0; i < 17; i++) {
- sprintf(label, "%d%% opaque", i * 100 / 16);
- glutAddMenuEntry(label, i);
- }
- }
- int
- main(int argc, char **argv)
- {
- int torusMenu, icoMenu, tetraMenu;
- glutInit(&argc, argv);
- glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
- glutCreateWindow("screen door transparency");
- glutDisplayFunc(display);
- glutReshapeFunc(reshape);
- myinit();
- torusMenu = glutCreateMenu(torusTransparency);
- createTransparencyMenu();
- icoMenu = glutCreateMenu(icoTransparency);
- createTransparencyMenu();
- tetraMenu = glutCreateMenu(tetraTransparency);
- createTransparencyMenu();
- glutCreateMenu(noop);
- glutAddSubMenu("Torus", torusMenu);
- glutAddSubMenu("Icosahedron", icoMenu);
- glutAddSubMenu("Tetrahedron", tetraMenu);
- glutAddMenuEntry("Rotate up", 1);
- glutAddMenuEntry("Rotate down", 2);
- glutAddMenuEntry("Quit", 666);
- glutAttachMenu(GLUT_RIGHT_BUTTON);
- glutMainLoop();
- return 0; /* ANSI C requires main to return int. */
- }