OpenGL颜色混合 
 1 #include "gl/glut.h"
 2 
 3 void Initialization()
 4 {
 5     glClearColor(0.0f,0.0f,0.0f,1.0f);
 6 
 7     glEnable(GL_BLEND);//启用混合状态
 8 }
 9 
10 void OnDisplay(void)
11 {
12     GLUquadricObj *obj; //定义实用库中的二次曲面指针
13 
14     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
15 
16     glMatrixMode(GL_MODELVIEW);
17     glLoadIdentity();
18 
19     glBlendFunc(GL_ONE_MINUS_DST_COLOR,GL_ONE_MINUS_SRC_COLOR); //混合函数
20 
21     glPushMatrix();
22     glTranslatef(0.0f,1.0f,0.0f);
23     glColor4f(1.0f,0.0f,0.0f,0.5f);
24     obj=gluNewQuadric(); //生成二次曲面对象
25     gluDisk(obj,0,1,30,1); //绘制圆盘
26     glPopMatrix();
27 
28     glPushMatrix();
29     glTranslatef(-0.5f,0.0f,0.0f);
30     glColor4f(0.0f,1.0f,0.0f,0.5f);
31     obj=gluNewQuadric(); //再次生成二次曲面对象
32     gluDisk(obj,0,1,30,1); //绘制另一个圆盘
33     glPopMatrix();
34 
35     glPushMatrix();
36     glTranslatef(0.5f,0.0f,0.0f);
37     glColor4f(0.0f,0.0f,1.0f,0.5f);
38     obj=gluNewQuadric(); //再次生成二次曲面对象
39     gluDisk(obj,0,1,30,1); //绘制第三个圆盘
40     glPopMatrix();
41 
42     glutSwapBuffers();
43 }
44 
45 void OnReShape(int w,int h)
46 {
47     glViewport(0,0,w,h);
48     
49     glMatrixMode(GL_PROJECTION); //将当前矩阵指定为投影模式
50     glLoadIdentity();
51     
52     if (h!=0)
53     {
54         GLfloat aspect =(float)w/(float)h;
55 
56         if(w<h)
57             gluOrtho2D(-3,3,-3*aspect,3*aspect);//二维正交投影
58         else
59             gluOrtho2D(-3/aspect,3/aspect,-3,3);
60 
61     }
62     glMatrixMode(GL_MODELVIEW);
63     glLoadIdentity();
64 }
65 
66 
67 void main(int argc,char* argv[])
68 {
69     glutInit(&argc,argv);
70     glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
71     glutInitWindowSize(600,480);
72     glutCreateWindow("OpenGL颜色混合");
73     
74     glutReshapeFunc(OnReShape);
75     glutDisplayFunc(OnDisplay);
76     
77     Initialization();
78     
79     glutMainLoop();
80 }
 posted on 2012-04-17 22:00  xiacl  阅读(315)  评论(0)  编辑  收藏  举报