c++ - openGL: glGenVertexArrays 访问冲突执行位置 0x00000000

Question

我正在尝试自己学习 openGL，所以我买了一本关于 openGL 的书，第一章是示例代码，所以我尝试了一下，但出了点问题。在第 17(glGenVertexArrays(NumVAOs, VAOs);) 和 18(glBindVertexArray(VAOs[Triangles]);) 是 VS 2013 Ultimate 准确报告错误“openGL_3.exe 中 0x77350309 处的未处理异常:0xC0000005:访问冲突执行位置 0x00000000。 ”。所以我认为内存有问题，但我不知道是什么。有人能帮我吗？

#include <iostream>
using namespace std;

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


enum VAO_IDs { Triangles, NumVAOs };
enum Buffer_IDs { ArrayBuffer, NumBuffers };
enum Attrib_IDs { vPosition = 0 };
GLuint VAOs[NumVAOs];
GLuint Buffers[NumBuffers];
const GLuint NumVertices = 6;

void init(void)
{
    glGenVertexArrays(NumVAOs, VAOs);
    glBindVertexArray(VAOs[Triangles]);
    GLfloat vertices[NumVertices][2] = {
        { -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, 2, GL_FLOAT,
    GL_FALSE, 0, BUFFER_OFFSET(0));
    glEnableVertexAttribArray(vPosition);
}

void display(void)
{
    glClear(GL_COLOR_BUFFER_BIT);
    glBindVertexArray(VAOs[Triangles]);
    glDrawArrays(GL_TRIANGLES, 0, NumVertices);
    glFlush();
}

int main(int argc, char** argv)
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_RGBA);
    glutInitWindowSize(512, 512);
    glutInitContextVersion(4, 3);
    glutInitContextProfile(GLUT_CORE_PROFILE);
    glutCreateWindow(argv[0]);
    if (glewInit()) {
        cerr << "Unable to initialize GLEW ... exiting" << endl;
        exit(EXIT_FAILURE);
    }
    init();
    glutDisplayFunc(display);
    glutMainLoop();
}

Answer 1

您可以尝试设置:

glewExperimental = GL_TRUE;

在调用 glewInit() 之前。资料来源:

https://stackoverflow.com/a/20822876/833188

https://stackoverflow.com/a/22820845/833188