因此，我在Youtube上遵循了本教程，似乎在某个地方出错了。
完全错误：
Exception in thread "main" org.lwjgl.opengl.OpenGLException: Invalid operation (1282)
at org.lwjgl.opengl.Util.checkGLError(Util.java:59)
at org.lwjgl.opengl.GL11.glDrawArrays(GL11.java:1205)
at renderEngine.Renderer.render(Renderer.java:21)
at engineTester.MainGameLoop.main(MainGameLoop.java:33)
代码：
Renderer.java：
package renderEngine;
import org.lwjgl.opengl.GL11;
import org.lwjgl.opengl.GL20;
import org.lwjgl.opengl.GL30;
import renderEngine.RawModel;
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_TRIANGLE, 0, model.getVertexCount());
GL20.glDisableVertexAttribArray(0);
GL30.glBindVertexArray(0);
}
}
RawModel.java
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;
}
}
MainGameLoop.java：
package engineTester;
import org.lwjgl.opengl.Display;
import renderEngine.DisplayManager;
import renderEngine.Loader;
import renderEngine.RawModel;
import renderEngine.Renderer;
public class MainGameLoop {
public static void main(String[] args) {
DisplayManager.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);
while(!Display.isCloseRequested()) {
renderer.prepare();
renderer.render(model);
DisplayManager.updateDisplay();
}
loader.cleanUp();
DisplayManager.closeDisplay();
}
}
DisplayManager.java：
package renderEngine;
import org.lwjgl.opengl.ContextAttribs;
import org.lwjgl.opengl.Display;
import org.lwjgl.LWJGLException;
import org.lwjgl.opengl.DisplayMode;
import org.lwjgl.opengl.GL11;
import org.lwjgl.opengl.PixelFormat;
public class DisplayManager {
private static final int WIDTH = 1280;
private static final int HEIGHT = 720;
private static final int FPSCAP = 120;
public static void createDisplay() {
ContextAttribs attribs = new ContextAttribs(3,2).withForwardCompatible(true).withProfileCore(true);
try {
Display.setDisplayMode(new DisplayMode(WIDTH,HEIGHT));
Display.create(new PixelFormat(), attribs);
Display.setTitle("Game");
} catch (LWJGLException e) {
e.printStackTrace();
}
GL11.glViewport(0, 0, WIDTH, HEIGHT);
}
public static void updateDisplay() {
Display.sync(FPSCAP);
Display.update();
}
public static void closeDisplay() {
Display.destroy();
}
}
Loader.java：
package renderEngine;
import java.nio.FloatBuffer;
import java.util.ArrayList;
import java.util.List;
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);
}
public void cleanUp() {
for(int vao:vaos) {
GL30.glDeleteVertexArrays(vao);
}
for(int vbo:vbos) {
GL15.glDeleteBuffers(vbo);
}
}
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);
}
private FloatBuffer storeDataInFloatBuffer(float[] data) {
FloatBuffer buffer = BufferUtils.createFloatBuffer(data.length);
buffer.put(data);
buffer.flip();
return buffer;
}
}
我确实看到它告诉我在第21行的渲染器文件中有问题，并且在执行MainGameLoop第33行时遇到了错误
但是除此之外，我无法弄清楚。
我正在使用Java SDK 8 LWJGL 2.8.9（或类似的东西）