LWJGL OpenGL glGenVertexArrays() Error: This Function is not available
LWJGL OpenGL glGenVertexArrays() Error: This Function is not available
所有，在使用 glGenVertexArrays() 时遇到困难。我收到以下错误：
Exception in thread "main" java.lang.IllegalStateException: This functionality is not available.
at org.lwjgl.system.Checks.checkFunctionality(Checks.java:57)
at org.lwjgl.opengl.GL30.getInstance(GL30.java:667)
at org.lwjgl.opengl.GL30.getInstance(GL30.java:662)
at org.lwjgl.opengl.GL30.nglGenVertexArrays(GL30.java:2789)
at org.lwjgl.opengl.GL30.glGenVertexArrays(GL30.java:2816)
at renderEngine.Loader.createVAO(Loader.java:26)
at renderEngine.Loader.loadToVAO(Loader.java:19)
at renderEngine.MainGameLoop.main(MainGameLoop.java:27)
这是我的主游戏循环（我从 createDisplay() 方法调用 GL.createCapabilities()。）
package renderEngine;
import static org.lwjgl.glfw.GLFW.*;
public class MainGameLoop {
public static DisplayManager dm = new DisplayManager();
public static void main(String[] args) {
//Create Display
dm.createDisplay();
Loader loader = new Loader();
Renderer renderer = new Renderer();
float[] vertices = {
-0.5f,0.5f,0f,
-0.5f,-0.5f,0f,
0.5f,-0.5f,0f,
0.5f,-0.5f,0f,
0.5f,0.5f,0f,
-0.5f,0.5f,0f
};
RawModel model = loader.loadToVAO(vertices);
//Game Loop
while (glfwWindowShouldClose(dm.getWindowID()) != GLFW_TRUE) {
renderer.prepare();
renderer.render(model);
dm.updateDisplay();
}
//Destroy Display
dm.destroyWindow();
loader.cleanUp();
}
}
如上所述，这里是显示管理器 class:
package renderEngine;
import static org.lwjgl.glfw.GLFW.*;
import org.lwjgl.glfw.GLFW;
import org.lwjgl.glfw.GLFWErrorCallback;
import org.lwjgl.glfw.GLFWKeyCallback;
import org.lwjgl.opengl.GL;
public class DisplayManager {
private GLFWErrorCallback errorCallback;
private GLFWKeyCallback keyCallback;
private long windowID;
//Constructor
public DisplayManager(){
init();
}
private void init(){
if(glfwInit() != GLFW_TRUE){
throw new IllegalStateException("Unable to initiate GLFW");
}
}
public long createDisplay(){
windowID = glfwCreateWindow(640,480,"Hello World!", 0, 0);
if(windowID == 0){
glfwTerminate();
throw new RuntimeException("Failed to create the GLFW window");
}
GLFW.glfwSetWindowTitle(windowID, "GLFW Window");
setErrorCallback();
setKeyCallback();
glfwMakeContextCurrent(windowID);
GL.createCapabilities();
return windowID;
}
public long getWindowID(){
return this.windowID;
}
private void setErrorCallback(){
errorCallback = GLFWErrorCallback.createPrint(System.err);
glfwSetErrorCallback(errorCallback);
}
private void setKeyCallback(){
keyCallback = new GLFWKeyCallback(){
@Override
public void invoke(long window, int key, int scancode, int action, int mods) {
if(key == GLFW_KEY_ESCAPE && action == GLFW_PRESS){
glfwSetWindowShouldClose(window, GLFW_TRUE);
}
}
};
glfwSetKeyCallback(windowID, keyCallback);
}
public void updateDisplay(){
GLFW.glfwSwapInterval(1);
glfwSwapBuffers(windowID);
glfwPollEvents();
}
public void destroyWindow(){
glfwDestroyWindow(windowID);
keyCallback.release();
glfwTerminate();
errorCallback.release();
}
}
如果上面提到的错误似乎与加载程序有关 class:
package renderEngine;
import java.util.List;
import java.nio.FloatBuffer;
import java.util.ArrayList;
import org.lwjgl.BufferUtils;
import org.lwjgl.opengl.GL11;
import org.lwjgl.opengl.GL15;
import org.lwjgl.opengl.GL20;
import org.lwjgl.opengl.GL30;
public class Loader {
private List<Integer> vaos = new ArrayList<Integer>();
private List<Integer> vbos = new ArrayList<Integer>();
public RawModel loadToVAO(float[] positions){
int vaoID = createVAO();
storeDataInAttributeList(0,positions);
unbindVAO();
return new RawModel(vaoID,positions.length/3);
}
private int createVAO() {
int vaoID = GL30.glGenVertexArrays();
vaos.add(vaoID);
GL30.glBindVertexArray(vaoID);
return vaoID;
}
private void storeDataInAttributeList(int attributeNumber, float[] data) {
int vboID = GL15.glGenBuffers();
vbos.add(vboID);
GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, vboID);
FloatBuffer buffer = storeDataInFloatBuffer(data);
GL15.glBufferData(GL15.GL_ARRAY_BUFFER, buffer, GL15.GL_STATIC_DRAW);
GL20.glVertexAttribPointer(attributeNumber, 3, GL11.GL_FLOAT, false, 0, 0);
GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, 0);
}
private void unbindVAO() {
GL30.glBindVertexArray(0); //0 un-binds currently bound VAO
}
public void cleanUp(){
for(int vao:vaos){
GL30.glDeleteVertexArrays(vao);
}
for(int vbo:vbos){
GL15.glDeleteBuffers(vbo);
}
}
private FloatBuffer storeDataInFloatBuffer(float[] data){
FloatBuffer buffer = BufferUtils.createFloatBuffer(data.length);
buffer.put(data);
buffer.flip();
return buffer;
}
}
特别是这行代码：
GL30.glBindVertexArray(vaoID);
据我所知，这是正确的方法，GL capabilities/context 已从主线程 set/called（主游戏循环主方法，利用显示管理器)
为了完整性，这里是 RawModel 和 Renderer Classes，不要怀疑这些问题：
package renderEngine;
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;
}
}
这是渲染器 Class:
package renderEngine;
import org.lwjgl.opengl.GL11;
import org.lwjgl.opengl.GL20;
import org.lwjgl.opengl.GL30;
public class Renderer {
public void prepare(){
GL11.glClearColor(1, 0, 0, 1);
GL11.glClear(GL11.GL_COLOR_BUFFER_BIT);
}
public void render(RawModel model){
GL30.glBindVertexArray(model.getVaoID());
GL20.glEnableVertexAttribArray(0);
GL11.glDrawArrays(GL11.GL_TRIANGLES, 0, model.getVertexCount());
GL20.glDisableVertexAttribArray(0);
GL30.glBindVertexArray(0);
}
}
如能就我的 'glGenVertexArrays' 实施提供任何帮助，我们将不胜感激。
我现在添加了以下内容
GLFW.glfwDefaultWindowHints();
GLFW.glfwWindowHint(GLFW.GLFW_CONTEXT_VERSION_MAJOR, 3);
GLFW.glfwWindowHint(GLFW.GLFW_CONTEXT_VERSION_MINOR, 2);
但是，我现在收到以下错误：
Exception in thread "main" java.lang.RuntimeException: Failed to create the GLFW window
at renderEngine.DisplayManager.createDisplay(DisplayManager.java:37)
at renderEngine.MainGameLoop.main(MainGameLoop.java:12)
我的createDisplay()具体实现如下：
public long createDisplay(){
GLFW.glfwDefaultWindowHints();
GLFW.glfwWindowHint(GLFW.GLFW_CONTEXT_VERSION_MAJOR, 3);
GLFW.glfwWindowHint(GLFW.GLFW_CONTEXT_VERSION_MINOR, 2);
windowID = glfwCreateWindow(640,480,"Hello World!", 0, 0);
if(windowID == 0){
glfwTerminate();
throw new RuntimeException("Failed to create the GLFW window");
}
GLFW.glfwSetWindowTitle(windowID, "GLFW Window");
setErrorCallback();
setKeyCallback();
glfwMakeContextCurrent(windowID);
GL.createCapabilities();
return windowID;
}
更新
如果删除了错误回调，因为认为它们可能会导致问题。产生的错误是：
Exception in thread "main" java.lang.RuntimeException: Failed to create the GLFW window
at renderEngine.DisplayManager.createDisplay(DisplayManager.java:40)
at renderEngine.MainGameLoop.main(MainGameLoop.java:12)
似乎正在抛出 RuntimeException，如果无法创建 glfw window，则显示我的自定义错误消息。难道这和我运行这个的顺序有关？我用 noluck 尝试放置 'init' 方法。一定有什么我忽略的东西吗？...谢谢。
显示管理器的更新代码：
package renderEngine;
导入静态 org.lwjgl.glfw.GLFW.*;
import org.lwjgl.glfw.GLFW;
import org.lwjgl.glfw.GLFWErrorCallback;
import org.lwjgl.glfw.GLFWKeyCallback;
import org.lwjgl.opengl.GL;
public class DisplayManager {
private GLFWErrorCallback errorCallback;
private GLFWKeyCallback keyCallback;
private long windowID;
//Constructor
public DisplayManager(){
init();
}
private void init(){
if(glfwInit() != GLFW_TRUE){
throw new IllegalStateException("Unable to initiate GLFW");
}
}
public long createDisplay(){
GLFW.glfwDefaultWindowHints();
GLFW.glfwWindowHint(GLFW.GLFW_CONTEXT_VERSION_MAJOR, 3);
GLFW.glfwWindowHint(GLFW.GLFW_CONTEXT_VERSION_MINOR, 2);
windowID = glfwCreateWindow(640,480,"Hello World!", 0, 0);
System.out.println(windowID);
if(windowID == 0){
glfwTerminate();
throw new RuntimeException("Failed to create the GLFW window");
}
glfwMakeContextCurrent(windowID);
GL.createCapabilities();
GLFW.glfwSetWindowTitle(windowID, "GLFW Window");
//setErrorCallback();
//setKeyCallback();
return windowID;
}
public long getWindowID(){
return this.windowID;
}
private void setErrorCallback(){
errorCallback = GLFWErrorCallback.createPrint(System.err);
glfwSetErrorCallback(errorCallback);
}
private void setKeyCallback(){
keyCallback = new GLFWKeyCallback(){
@Override
public void invoke(long window, int key, int scancode, int action, int mods) {
if(key == GLFW_KEY_ESCAPE && action == GLFW_PRESS){
glfwSetWindowShouldClose(window, GLFW_TRUE);
}
}
};
glfwSetKeyCallback(windowID, keyCallback);
}
public void updateDisplay(){
GLFW.glfwSwapInterval(1);
glfwSwapBuffers(windowID);
glfwPollEvents();
}
public void destroyWindow(){
glfwDestroyWindow(windowID);
keyCallback.release();
glfwTerminate();
errorCallback.release();
}
}
非常感谢和亲切的问候，
杰克
glGenVertexArrays 函数需要 OpenGL 3.0 或更高版本。你必须明确地告诉 GLFW。在调用 glfwCreateWindow 之前：
GLFW.glfwDefaultWindowHints();
GLFW.glfwWindowHint(GLFW.CONTEXT_VERSION_MAJOR, 3);
GLFW.glfwWindowHint(GLFW.CONTEXT_VERSION_MINOR, 0);
您可以通过调用 GL11.glGetString(GL11.GL_VERSION) 或查看 GL.getCapabilities().OpenGL30 标志来检查您是否拥有 OpenGL 3.0 或更高版本。
所有，在使用 glGenVertexArrays() 时遇到困难。我收到以下错误：
Exception in thread "main" java.lang.IllegalStateException: This functionality is not available. at org.lwjgl.system.Checks.checkFunctionality(Checks.java:57) at org.lwjgl.opengl.GL30.getInstance(GL30.java:667) at org.lwjgl.opengl.GL30.getInstance(GL30.java:662) at org.lwjgl.opengl.GL30.nglGenVertexArrays(GL30.java:2789) at org.lwjgl.opengl.GL30.glGenVertexArrays(GL30.java:2816) at renderEngine.Loader.createVAO(Loader.java:26) at renderEngine.Loader.loadToVAO(Loader.java:19) at renderEngine.MainGameLoop.main(MainGameLoop.java:27)
这是我的主游戏循环（我从 createDisplay() 方法调用 GL.createCapabilities()。）
package renderEngine;
import static org.lwjgl.glfw.GLFW.*;
public class MainGameLoop {
public static DisplayManager dm = new DisplayManager();
public static void main(String[] args) {
//Create Display
dm.createDisplay();
Loader loader = new Loader();
Renderer renderer = new Renderer();
float[] vertices = {
-0.5f,0.5f,0f,
-0.5f,-0.5f,0f,
0.5f,-0.5f,0f,
0.5f,-0.5f,0f,
0.5f,0.5f,0f,
-0.5f,0.5f,0f
};
RawModel model = loader.loadToVAO(vertices);
//Game Loop
while (glfwWindowShouldClose(dm.getWindowID()) != GLFW_TRUE) {
renderer.prepare();
renderer.render(model);
dm.updateDisplay();
}
//Destroy Display
dm.destroyWindow();
loader.cleanUp();
}
}
如上所述，这里是显示管理器 class:
package renderEngine;
import static org.lwjgl.glfw.GLFW.*;
import org.lwjgl.glfw.GLFW;
import org.lwjgl.glfw.GLFWErrorCallback;
import org.lwjgl.glfw.GLFWKeyCallback;
import org.lwjgl.opengl.GL;
public class DisplayManager {
private GLFWErrorCallback errorCallback;
private GLFWKeyCallback keyCallback;
private long windowID;
//Constructor
public DisplayManager(){
init();
}
private void init(){
if(glfwInit() != GLFW_TRUE){
throw new IllegalStateException("Unable to initiate GLFW");
}
}
public long createDisplay(){
windowID = glfwCreateWindow(640,480,"Hello World!", 0, 0);
if(windowID == 0){
glfwTerminate();
throw new RuntimeException("Failed to create the GLFW window");
}
GLFW.glfwSetWindowTitle(windowID, "GLFW Window");
setErrorCallback();
setKeyCallback();
glfwMakeContextCurrent(windowID);
GL.createCapabilities();
return windowID;
}
public long getWindowID(){
return this.windowID;
}
private void setErrorCallback(){
errorCallback = GLFWErrorCallback.createPrint(System.err);
glfwSetErrorCallback(errorCallback);
}
private void setKeyCallback(){
keyCallback = new GLFWKeyCallback(){
@Override
public void invoke(long window, int key, int scancode, int action, int mods) {
if(key == GLFW_KEY_ESCAPE && action == GLFW_PRESS){
glfwSetWindowShouldClose(window, GLFW_TRUE);
}
}
};
glfwSetKeyCallback(windowID, keyCallback);
}
public void updateDisplay(){
GLFW.glfwSwapInterval(1);
glfwSwapBuffers(windowID);
glfwPollEvents();
}
public void destroyWindow(){
glfwDestroyWindow(windowID);
keyCallback.release();
glfwTerminate();
errorCallback.release();
}
}
如果上面提到的错误似乎与加载程序有关 class:
package renderEngine;
import java.util.List;
import java.nio.FloatBuffer;
import java.util.ArrayList;
import org.lwjgl.BufferUtils;
import org.lwjgl.opengl.GL11;
import org.lwjgl.opengl.GL15;
import org.lwjgl.opengl.GL20;
import org.lwjgl.opengl.GL30;
public class Loader {
private List<Integer> vaos = new ArrayList<Integer>();
private List<Integer> vbos = new ArrayList<Integer>();
public RawModel loadToVAO(float[] positions){
int vaoID = createVAO();
storeDataInAttributeList(0,positions);
unbindVAO();
return new RawModel(vaoID,positions.length/3);
}
private int createVAO() {
int vaoID = GL30.glGenVertexArrays();
vaos.add(vaoID);
GL30.glBindVertexArray(vaoID);
return vaoID;
}
private void storeDataInAttributeList(int attributeNumber, float[] data) {
int vboID = GL15.glGenBuffers();
vbos.add(vboID);
GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, vboID);
FloatBuffer buffer = storeDataInFloatBuffer(data);
GL15.glBufferData(GL15.GL_ARRAY_BUFFER, buffer, GL15.GL_STATIC_DRAW);
GL20.glVertexAttribPointer(attributeNumber, 3, GL11.GL_FLOAT, false, 0, 0);
GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, 0);
}
private void unbindVAO() {
GL30.glBindVertexArray(0); //0 un-binds currently bound VAO
}
public void cleanUp(){
for(int vao:vaos){
GL30.glDeleteVertexArrays(vao);
}
for(int vbo:vbos){
GL15.glDeleteBuffers(vbo);
}
}
private FloatBuffer storeDataInFloatBuffer(float[] data){
FloatBuffer buffer = BufferUtils.createFloatBuffer(data.length);
buffer.put(data);
buffer.flip();
return buffer;
}
}
特别是这行代码：
GL30.glBindVertexArray(vaoID);
据我所知，这是正确的方法，GL capabilities/context 已从主线程 set/called（主游戏循环主方法，利用显示管理器)
为了完整性，这里是 RawModel 和 Renderer Classes，不要怀疑这些问题：
package renderEngine;
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;
}
}
这是渲染器 Class:
package renderEngine;
import org.lwjgl.opengl.GL11;
import org.lwjgl.opengl.GL20;
import org.lwjgl.opengl.GL30;
public class Renderer {
public void prepare(){
GL11.glClearColor(1, 0, 0, 1);
GL11.glClear(GL11.GL_COLOR_BUFFER_BIT);
}
public void render(RawModel model){
GL30.glBindVertexArray(model.getVaoID());
GL20.glEnableVertexAttribArray(0);
GL11.glDrawArrays(GL11.GL_TRIANGLES, 0, model.getVertexCount());
GL20.glDisableVertexAttribArray(0);
GL30.glBindVertexArray(0);
}
}
如能就我的 'glGenVertexArrays' 实施提供任何帮助，我们将不胜感激。
我现在添加了以下内容
GLFW.glfwDefaultWindowHints();
GLFW.glfwWindowHint(GLFW.GLFW_CONTEXT_VERSION_MAJOR, 3);
GLFW.glfwWindowHint(GLFW.GLFW_CONTEXT_VERSION_MINOR, 2);
但是，我现在收到以下错误：
Exception in thread "main" java.lang.RuntimeException: Failed to create the GLFW window at renderEngine.DisplayManager.createDisplay(DisplayManager.java:37) at renderEngine.MainGameLoop.main(MainGameLoop.java:12)
我的createDisplay()具体实现如下：
public long createDisplay(){
GLFW.glfwDefaultWindowHints();
GLFW.glfwWindowHint(GLFW.GLFW_CONTEXT_VERSION_MAJOR, 3);
GLFW.glfwWindowHint(GLFW.GLFW_CONTEXT_VERSION_MINOR, 2);
windowID = glfwCreateWindow(640,480,"Hello World!", 0, 0);
if(windowID == 0){
glfwTerminate();
throw new RuntimeException("Failed to create the GLFW window");
}
GLFW.glfwSetWindowTitle(windowID, "GLFW Window");
setErrorCallback();
setKeyCallback();
glfwMakeContextCurrent(windowID);
GL.createCapabilities();
return windowID;
}
更新
如果删除了错误回调，因为认为它们可能会导致问题。产生的错误是：
Exception in thread "main" java.lang.RuntimeException: Failed to create the GLFW window at renderEngine.DisplayManager.createDisplay(DisplayManager.java:40) at renderEngine.MainGameLoop.main(MainGameLoop.java:12)
似乎正在抛出 RuntimeException，如果无法创建 glfw window，则显示我的自定义错误消息。难道这和我运行这个的顺序有关？我用 noluck 尝试放置 'init' 方法。一定有什么我忽略的东西吗？...谢谢。
显示管理器的更新代码：
package renderEngine;
导入静态 org.lwjgl.glfw.GLFW.*;
import org.lwjgl.glfw.GLFW;
import org.lwjgl.glfw.GLFWErrorCallback;
import org.lwjgl.glfw.GLFWKeyCallback;
import org.lwjgl.opengl.GL;
public class DisplayManager {
private GLFWErrorCallback errorCallback;
private GLFWKeyCallback keyCallback;
private long windowID;
//Constructor
public DisplayManager(){
init();
}
private void init(){
if(glfwInit() != GLFW_TRUE){
throw new IllegalStateException("Unable to initiate GLFW");
}
}
public long createDisplay(){
GLFW.glfwDefaultWindowHints();
GLFW.glfwWindowHint(GLFW.GLFW_CONTEXT_VERSION_MAJOR, 3);
GLFW.glfwWindowHint(GLFW.GLFW_CONTEXT_VERSION_MINOR, 2);
windowID = glfwCreateWindow(640,480,"Hello World!", 0, 0);
System.out.println(windowID);
if(windowID == 0){
glfwTerminate();
throw new RuntimeException("Failed to create the GLFW window");
}
glfwMakeContextCurrent(windowID);
GL.createCapabilities();
GLFW.glfwSetWindowTitle(windowID, "GLFW Window");
//setErrorCallback();
//setKeyCallback();
return windowID;
}
public long getWindowID(){
return this.windowID;
}
private void setErrorCallback(){
errorCallback = GLFWErrorCallback.createPrint(System.err);
glfwSetErrorCallback(errorCallback);
}
private void setKeyCallback(){
keyCallback = new GLFWKeyCallback(){
@Override
public void invoke(long window, int key, int scancode, int action, int mods) {
if(key == GLFW_KEY_ESCAPE && action == GLFW_PRESS){
glfwSetWindowShouldClose(window, GLFW_TRUE);
}
}
};
glfwSetKeyCallback(windowID, keyCallback);
}
public void updateDisplay(){
GLFW.glfwSwapInterval(1);
glfwSwapBuffers(windowID);
glfwPollEvents();
}
public void destroyWindow(){
glfwDestroyWindow(windowID);
keyCallback.release();
glfwTerminate();
errorCallback.release();
}
}
非常感谢和亲切的问候， 杰克
glGenVertexArrays 函数需要 OpenGL 3.0 或更高版本。你必须明确地告诉 GLFW。在调用 glfwCreateWindow 之前：
GLFW.glfwDefaultWindowHints();
GLFW.glfwWindowHint(GLFW.CONTEXT_VERSION_MAJOR, 3);
GLFW.glfwWindowHint(GLFW.CONTEXT_VERSION_MINOR, 0);
您可以通过调用 GL11.glGetString(GL11.GL_VERSION) 或查看 GL.getCapabilities().OpenGL30 标志来检查您是否拥有 OpenGL 3.0 或更高版本。