无法在GLEW应用程序中将OpenGL缓冲区打印到控制台

Question

我正在使用这里找到的教程.我正在使用GLFW.我的窗口加载正常,但在打电话时

GLuint vertexBuffer;
glGenBuffers( 1, &vertexBuffer );
printf( "%u\n", vertexBuffer );

它不是写入控制台,如果我关闭openGL窗口它会中断(不是我关闭控制台).我猜这指针有问题吗？但对我来说似乎是正确的,而且正如他在教程中所拥有的那样.

这是我的整个,非常小的.cpp(VS2012):

#define GLEW_STATIC

#include <GL/glew.h>
#include <GL/glfw.h>
#include <stdio.h>
#include <stdlib.h>

#pragma comment( lib, "glfw.lib")
#pragma comment( lib, "opengl32.lib")
#pragma comment( lib, "glew32s.lib")

int main() {

    glfwInit();
    glfwOpenWindowHint( GLFW_OPENGL_VERSION_MAJOR, 3 );
    glfwOpenWindowHint( GLFW_OPENGL_VERSION_MINOR, 2 );
    glfwOpenWindowHint( GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE );

    glfwOpenWindowHint( GLFW_WINDOW_NO_RESIZE, GL_TRUE );
    glfwOpenWindow( 800, 600, 0, 0, 0, 0, 0, 0, GLFW_WINDOW );
    glfwSetWindowTitle( "OpenGL" );

    printf("This works");
    while( glfwGetWindowParam( GLFW_OPENED ) ) {
        glfwSwapBuffers();
    }

    glewExperimental = GL_TRUE;
    glewInit();

    GLuint vertexBuffer;
    glGenBuffers( 1, &vertexBuffer );
    printf( "%u\n", vertexBuffer );

    glfwTerminate();

    exit( EXIT_SUCCESS );
}

Answer 1

它无法将其写入控制台,因为永远不会到达相关代码.

只要窗口打开,代码就会运行几乎无限的while循环.

while(glfwGetWindowParam(GLFW_OPENED))
{
    glfwSwapBuffers();
}

您应该在此循环之前放置所有初始化代码.

glewExperimental = GL_TRUE;
glewInit();

并在循环之前或循环中创建缓冲区对象.实际上,当您要将新内容加载到现有场景时,您将在循环内创建缓冲区对象.

GLuint vertexBuffer;
glGenBuffers(1, &vertexBuffer);
printf("%u\n", vertexBuffer);

您的最终main功能可能如下所示.

int main()
{
    // GLFW initialization
    glfwInit();
    // ...
    glfwOpenWindow(800, 600, 0, 0, 0, 0, 0, 0, GLFW_WINDOW);
    glfwSetWindowTitle("My first OpenGL Application");

    // GLEW initialization
    glewExperimental = GL_TRUE;
    glewInit();

    // vertex buffer
    GLuint vertexBuffer;
    glGenBuffers(1, &vertexBuffer);
    printf("%u\n", vertexBuffer);

    // main loop
    bool running = true;
    while(running) {
        // exit
        if (!glfwGetWindowParam(GLFW_OPENED))
            running = false;

        // display
        glfwSwapBuffers();
    }

    // clean up
    glfwTerminate();
    exit(EXIT_SUCCESS);
}