freeglut+glew一个小例子

 1 #include <stdio.h>
 2 
 3 #include <GL/glew.h>
 4 #include <GL/freeglut.h>
 5 
 6 struct Vector3f
 7 {
 8     float x;
 9     float y;
10     float z;
11 
12     Vector3f()
13     {
14     }
15 
16     Vector3f(float _x, float _y, float _z)
17     {
18         x = _x;
19         y = _y;
20         z = _z;
21     }
22 };
23 
24 GLuint VBO;
25 
26 static void RenderSceneCB()
27 {
28     glClear(GL_COLOR_BUFFER_BIT);
29 
30     glEnableVertexAttribArray(0);
31     glBindBuffer(GL_ARRAY_BUFFER, VBO);
32     glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, 0);
33 
34     glDrawArrays(GL_POINTS, 0, 1);
35 
36     glDisableVertexAttribArray(0);
37 
38     glutSwapBuffers();
39 }
40 
41 
42 static void InitializeGlutCallbacks()
43 {
44     glutDisplayFunc(RenderSceneCB);
45 }
46 
47 static void CreateVertexBuffer()
48 {
49     Vector3f Vertices[1];
50     Vertices[0] = Vector3f(0.0f, 0.0f, 0.0f);
51 
52     glGenBuffers(1, &VBO);
53     glBindBuffer(GL_ARRAY_BUFFER, VBO);
54     glBufferData(GL_ARRAY_BUFFER, sizeof(Vertices), Vertices, GL_STATIC_DRAW);
55 }
56 
57 
58 int main(int argc, char** argv)
59 {
60     glutInit(&argc, argv);
61     glutInitDisplayMode(GLUT_DOUBLE|GLUT_RGBA);
62     glutInitWindowSize(1024, 768);
63     glutInitWindowPosition(100, 100);
64     glutCreateWindow("Tutorial 02");
65 
66     InitializeGlutCallbacks();
67 
68     // Must be done after glut is initialized!
69     GLenum res = glewInit();
70     if (res != GLEW_OK) {
71         fprintf(stderr, "Error: ‘%s‘\n", glewGetErrorString(res));
72         return 1;
73     }
74 
75     glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
76 
77     CreateVertexBuffer();
78 
79     glutMainLoop();
80 
81     return 0;
82 }