编译opengl编程指南第八版示例代码通过

最近在编译opengl编程指南第八版的示例代码，如下

 #include <iostream>
 #include "vgl.h"
 #include "LoadShaders.h"

 using namespace std;

 enum VAO_IDs { Triangles, NumVAOs };
 enum Buffer_IDs { ArrayBuffer, NumBuffers };
 enum Attrib_IDs { vPosition =  };
 GLuint VAOs[NumVAOs];
 GLuint Buffers[NumBuffers];
 const GLuint NumVertices = ;

 void
 init(void)
 {
     glGenVertexArrays(NumVAOs, VAOs);
     glBindVertexArray(VAOs[Triangles]);
     GLfloat vertices[NumVertices][] = {
         { -0.90, -0.90 }, // Triangle 1
         { 0.85, -0.90 },
         { -0.90, 0.85 },
         { 0.90, -0.85 }, // Triangle 2
         { 0.90, 0.90 },
         { -0.85, 0.90 }
     };
     glGenBuffers(NumBuffers, Buffers);
     glBindBuffer(GL_ARRAY_BUFFER, Buffers[ArrayBuffer]);
     glBufferData(GL_ARRAY_BUFFER, sizeof(vertices),
         vertices, GL_STATIC_DRAW);
     ShaderInfo shaders[] = {
         { GL_VERTEX_SHADER, "triangles.vert" },
         { GL_FRAGMENT_SHADER, "triangles.frag" },
         { GL_NONE, NULL }
     };
     GLuint program = LoadShaders(shaders);
     glUseProgram(program);
     glVertexAttribPointer(vPosition, , GL_FLOAT,
         GL_FALSE, , BUFFER_OFFSET());
     glEnableVertexAttribArray(vPosition);
 }

 void
 display(void)
 {
     glClear(GL_COLOR_BUFFER_BIT);
     glBindVertexArray(VAOs[Triangles]);
     glDrawArrays(GL_TRIANGLES, , NumVertices);
     glFlush();
 }

 int
 main(int argc, char** argv)
 {
     glutInit(&argc, argv);
     glutInitDisplayMode(GLUT_RGBA);
     glutInitWindowSize(, );
     glutInitContextVersion(, );
     glutInitContextProfile(GLUT_CORE_PROFILE);
     glutCreateWindow(argv[]);
     if (glewInit()) {
         cerr << "Unable to initialize GLEW ... exiting" << endl;
         exit(EXIT_FAILURE);
     }
     init();
     glutDisplayFunc(display);
     glutMainLoop();
 }

shader代码如下：

//顶点shader
#version  core

layout(location = ) in vec4 vPosition;

void main(){
    gl_Position = vPosition;
}

//片元shader
#version  core

out vec4 fColor;

void main(){
    fColor = vec4(0.0, 0.0, 1.0, 1.0);
}

在编译成功运行的时候老是在glGenVertexArrays和glBindVertexArray两个函数出crash，在stackoverflow上面找到了解决的办法，GLEW has trouble accessing some parts of the opengl core profile by default, so saying "glewExperimental = GL_TRUE;" before your call to glewInit() might help.因此只需要加这么一行代码就可以了

 int
 main(int argc, char** argv)
 {
     glutInit(&argc, argv);
     glutInitDisplayMode(GLUT_RGBA);
     glutInitWindowSize(, );
     glutInitContextVersion(, );
     glutInitContextProfile(GLUT_CORE_PROFILE);
     glutCreateWindow(argv[]);
     glewExperimental = GL_TRUE;//add
     if (glewInit()) {
         cerr << "Unable to initialize GLEW ... exiting" << endl;
         exit(EXIT_FAILURE);
     }
     init();
     glutDisplayFunc(display);
     glutMainLoop();
 }

运行结果如下