嘗試繪制三角形時LWJGL閃爍輸出

Question

我一直在嘗試使用LWJGL進入OpenGL，但遇到了無法找到解決方案的問題。 當嘗試使用下面的代碼繪制三角形時，窗口會正確打開，並開始閃爍不一定是預期三角形的形狀（有時會短暫顯示，但窗口的一個象限中經常有矩形）。

我猶豫的部分原因是，通過我在線閱讀各種文章和文檔，OpenGL如何在最近的內存中發生變化，從而在GL4中使用功能較少，更多面向對象的方法（VBO和GLSL？）。 我的理解是否正確？學習此用於LWJGL的新OpenGL的首選資源是什么？

先感謝您！

import org.lwjgl.BufferUtils;
import org.lwjgl.glfw.*;
import org.lwjgl.opengl.*;
import org.lwjgl.system.*;

import java.nio.*;

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

public class Main {
  private long windowID;

  private float[] tri = {0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f};

  public static void main(String[] args) {
    new Main().run();
  }

  public void run() { // Useful for making an instance class as opposed to a static main class?
    init();
    loop();

    glfwFreeCallbacks(windowID);
    glfwDestroyWindow(windowID);

    glfwTerminate();
    glfwSetErrorCallback(null).free();
  }

  public void init() { // Initializes all LWJGL components
    GLFWErrorCallback.createPrint(System.err).set(); // Create error callback route for GL

    if (!glfwInit()) { // Init GLFW
      throw new IllegalStateException("Failed to initialize GLFW!");
    } else {
      System.out.println("GLFW successfully initialized!");
    }

    windowID = glfwCreateWindow(640, 480, "Creating Window", NULL, NULL);

    if (windowID == NULL) { // Verify window creation
      throw new IllegalStateException("Failed to create window!");
    } else {
      System.out.println("Successfully created window!");
    }

    glfwDefaultWindowHints(); // Set window Proporties
    glfwWindowHint(GLFW_VISIBLE, GLFW_FALSE);
    glfwWindowHint(GLFW_RESIZABLE, GLFW_TRUE);

    glfwSetKeyCallback(windowID, (window, key, scancode, action, mods) -> { // Key callback for closing the window
      if (key == GLFW_KEY_ESCAPE && action == GLFW_RELEASE)
        glfwSetWindowShouldClose(window, true);
    });

    try (MemoryStack stack = stackPush()) { // Center the window
      IntBuffer pWidth = stack.mallocInt(1);
      IntBuffer pHeight = stack.mallocInt(1);

      glfwGetWindowSize(windowID, pWidth, pHeight);

      GLFWVidMode vidmode = glfwGetVideoMode(glfwGetPrimaryMonitor());

      glfwSetWindowPos( // Center the window
          windowID, 
          (vidmode.width() - pWidth.get(0)) / 2,
          (vidmode.height() - pHeight.get(0)) / 2
          );
    }

    glfwMakeContextCurrent(windowID); // Make the window current
    glfwSwapInterval(0); // Sets the min num of pushed frames before buffers are swaped (Likely prevents horizontal tearing)
    glfwShowWindow(windowID); // Unhides the window
  }

  private void loop() {
    GL.createCapabilities();
    glClearColor(0.0f, 0.0f, 0.0f, 0.0f); // The color to clear the buffers with

    while(!glfwWindowShouldClose(windowID)) { // If the window is allowed to live
      glClear(GL_COLOR_BUFFER_BIT); // The OR is nessesary for some reason

      FloatBuffer vBuff = BufferUtils.createFloatBuffer(6);
      vBuff.put(tri);
      glEnableClientState(GL_VERTEX_ARRAY);
      glVertexPointer(2, GL_FLOAT, 0, vBuff);
      glDrawArrays(GL_TRIANGLES, 0, 6);
      glDisableClientState(GL_VERTEX_ARRAY);

      glfwSwapBuffers(windowID);
      glfwPollEvents();
    } 
  }
}

Answer 1

vBuff.flip()和填充緩沖區后，您錯過了vBuff.flip() 。

vBuff.put(tri)將數據從當前位置（在此情況下為緩沖區的開始）開始傳輸到緩沖區。 緩沖區位置增加數據大小。 因此，新的緩沖區位置在新數據的末尾。

flip()將緩沖區的限制（長度）設置為當前位置，然后將該位置設置為零。

此外，不必在循環中連續創建和填充緩沖區，只需在循環前執行一次就足夠了：

FloatBuffer vBuff = BufferUtils.createFloatBuffer(6);
vBuff.put(tri);
vBuff.flip();

while(!glfwWindowShouldClose(windowID)) {
    glClear(GL_COLOR_BUFFER_BIT);

    glEnableClientState(GL_VERTEX_ARRAY);
    glVertexPointer(2, GL_FLOAT, 0, vBuff);
    glDrawArrays(GL_TRIANGLES, 0, 6);
    glDisableClientState(GL_VERTEX_ARRAY);

    glfwSwapBuffers(windowID);
    glfwPollEvents();
}