Java lwjgl 使用 VAO 的现代 OpenGL 访问冲突异常

Question

我目前正在学习有关使用 VAO 和 VBOS 进行渲染的 ThinMatrix OpenGL 教程。我几乎完全复制了代码（唯一的区别是我将工厂 class 设置为静态而不是正常使用）。我和他的程序版本之间唯一的技术差异是我使用的是 lwjgl 3 而不是 lwjgl 2。

这是我的源代码：

/*************
    MAIN
*************/
import Render.ModelLoader;
import Render.Render;
import Render.RawModel;
import org.lwjgl.Version;
import org.lwjgl.glfw.Callbacks;
import org.lwjgl.glfw.GLFWErrorCallback;
import org.lwjgl.glfw.GLFWVidMode;
import org.lwjgl.opengl.GL;

import static  org.lwjgl.opengl.GL11.*;
import static org.lwjgl.glfw.GLFW.*;
import static org.lwjgl.system.MemoryUtil.NULL;

public class Main {

    private static long window;
    private static ModelLoader modelLoader;
    private static Render renderer;


    private static final int WIDTH = 1280;
    private static final int HEIGHT = 720;

    public static void main(String[] args) {

        float[] vertices = {
                //Bottom left triangle
                -.5f,.5f,0f,
                -.5f,-.5f,0f,
                .5f,-.5f,0f,
                //Top right triangle
                .5f,-.5f,0f,
                .5f,.5f,0f,
                -.5f,.5f,0f
        };

        RawModel model = modelLoader.loadToVAO(vertices);

        initApp();

        //Main Loop
        while (!glfwWindowShouldClose(window)){
            glfwPollEvents();
            renderer.prepare();
            renderer.render(model);
            glfwSwapBuffers(window);
        }

        cleanUp();
    }

    public static void initApp(){
        System.out.println("LWJGL " + Version.getVersion());
        //Set the error callback routine to use System.err
        GLFWErrorCallback.createPrint(System.err).set();

        //Init GLFW
        if (!glfwInit()){
            throw new IllegalStateException("Could not initialise GLFW.");
        }

        //Create the window
        glfwDefaultWindowHints();
        glfwWindowHint(GLFW_RESIZABLE,GLFW_FALSE);
        window = glfwCreateWindow(WIDTH, HEIGHT, "My Display", NULL, NULL);
        if (window == NULL){
            throw new IllegalStateException("Could not create window");
        }

        //Center the window
        GLFWVidMode vidMode = glfwGetVideoMode(glfwGetPrimaryMonitor());
        glfwSetWindowPos(window, (vidMode.width()-WIDTH)/2, (vidMode.height()-HEIGHT)/2);

        //Link window's context to current thread
        glfwMakeContextCurrent(window);
        //VSync
        glfwSwapInterval(1);
        glfwShowWindow(window);

        GL.createCapabilities();
        System.out.println("OpenGL " + glGetString(GL_VERSION));
    }

    public static void cleanUp(){
        modelLoader.cleanUp();
        Callbacks.glfwFreeCallbacks(window); //Release callbacks
        glfwDestroyWindow(window); //Destroy the window
        glfwTerminate(); //Terminate GLFW
        glfwSetErrorCallback(null).set();
    }

}
/*************
   RAWMODEL
*************/
package Render;

public class RawModel {
    private int vaoID;
    private int vertexCount;

    public RawModel(int vaoID,int vertexCount){
        this.vaoID = vaoID;
        this.vertexCount = vertexCount;
    }

    public int getVaoID() {
        return vaoID;
    }

    public int getVertexCount() {
        return vertexCount;
    }
}
/*************
  MODELLOADER
*************/
package Render;

import org.lwjgl.BufferUtils;
import java.nio.FloatBuffer;
import java.util.ArrayList;
import java.util.List;

import static org.lwjgl.opengl.GL11.GL_FLOAT;
import static org.lwjgl.opengl.GL15.*;
import static org.lwjgl.opengl.GL20.*;
import static org.lwjgl.opengl.GL30.*;

public class ModelLoader {

    private static List<Integer> vaos = new ArrayList<>();
    private static List<Integer> vbos = new ArrayList<>();

    public static RawModel loadToVAO(float[] positions){
        int vaoID = createVAO();
        vaos.add(vaoID);
        storeDataInAttribList(0,positions);
        unbindVAO();
        return new RawModel(vaoID, positions.length/3);
    }

    private static int createVAO(){
        int vaoID = glGenVertexArrays();
        glBindVertexArray(vaoID);
        return vaoID;
    }

    private static void storeDataInAttribList(int attribNum, float[] data){
        int vboID = glGenBuffers();
        vbos.add(vboID);
        glBindBuffer(GL_ARRAY_BUFFER,vboID);
        FloatBuffer buffer = storeDataInFB(data);
        glBufferData(GL_ARRAY_BUFFER,buffer,GL_STATIC_DRAW);
        glVertexAttribPointer(attribNum,3,GL_FLOAT,false,0,0);
        glBindBuffer(GL_ARRAY_BUFFER,0);
    }

    private static FloatBuffer storeDataInFB(float[] data){
        FloatBuffer buffer = BufferUtils.createFloatBuffer(data.length);
        buffer.put(data);
        buffer.flip();
        return buffer;
    }

    private static void unbindVAO(){
        glBindVertexArray(0);
    }

    public static void cleanUp(){
        for (int vao:vaos) {
            glDeleteVertexArrays(vao);
        }
        for (int vbo:vbos) {
            glDeleteBuffers(vbo);
        }
    }
}
/*************
    RENDER
*************/
package Render;

import static org.lwjgl.opengl.GL11.*;
import static org.lwjgl.opengl.GL20.*;
import static org.lwjgl.opengl.GL30.*;

public class Render {

    public static void prepare(){
        glClearColor(0.0f,0.4f,0.6f,1.0f);
        glClear(GL_COLOR_BUFFER_BIT);
    }

    public static void render(RawModel model){
        glEnableClientState(GL_VERTEX_ARRAY);
        glBindVertexArray(model.getVaoID());
        glEnableVertexAttribArray(0);
        glDrawArrays(GL_TRIANGLES,0,model.getVertexCount());
        glDisableVertexAttribArray(0);
        glBindVertexArray(0);
        glDisableClientState(GL_VERTEX_ARRAY);
    }
}

我遇到的问题是，每当我尝试运行项目时，它就会崩溃并显示以下错误消息：

Connected to the target VM, address: '127.0.0.1:49390', transport: 'socket'

 A fatal error has been detected by the Java Runtime Environment:

  EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x00007ffffa09862d, pid=12556, tid=0x00000000000020ac

 JRE version: Java(TM) SE Runtime Environment (8.0_121-b13) (build 1.8.0_121-b13)
 Java VM: Java HotSpot(TM) 64-Bit Server VM (25.121-b13 mixed mode windows-amd64 compressed oops)
 Problematic frame:
 C  [lwjgl_opengl.dll+0x862d]

 Failed to write core dump. Minidumps are not enabled by default on client versions of Windows

 An error report file with more information is saved as:
 C:\Users\TokenGuard\IdeaProjects\ModernOpenGLTutorial\hs_err_pid12556.log

 If you would like to submit a bug report, please visit:
   http://bugreport.java.com/bugreport/crash.jsp
 The crash happened outside the Java Virtual Machine in native code.
 See problematic frame for where to report the bug.

Disconnected from the target VM, address: '127.0.0.1:49390', transport: 'socket'

Process finished with exit code 1

环顾四周，我发现了这个 Whosebug post: ，它似乎有同样的问题，而且该问题的 OP 实际上 post 提供了解决方案。

我使用的是 AMD 显卡，但我仍然尝试查看它是否解决了我的问题，但是它什么也没做，因为它仍然出现相同的错误消息。

在其中放置一些断点我发现问题出在 createVAO() 方法上，更具体地说，由于某种原因，对 glGenVertexArrays() 的调用失败了。我已经尝试明确告诉 glfw 使用 OpenGL 3.0 但它仍然没有帮助。

在这一点上我完全没有想法。关于我应该做什么的任何指导？

Answer 1

问题是这样的：

RawModel model = modelLoader.loadToVAO(vertices);
initApp();

你需要翻转它：

initApp();
RawModel model = modelLoader.loadToVAO(vertices)

问题在于，当您调用 modelLoader.loadToVAO(vertices) 时，它会调用 glGenVertexArrays()（如您所见）。然而，此时您还没有设置当前上下文。您在 initApp() 中使用 glfwMakeContextCurrent().

执行的操作

在调用任何 OpenGL 函数之前必须设置当前上下文。

Java lwjgl 使用 VAO 的现代 OpenGL 访问冲突异常

Java lwjgl Modern OpenGL Access Violation Exception using VAOs

java

opengl

render

lwjgl

vao