当我尝试在我的3D场景中显示文字时，它不会显示场景的其余部分。我该怎么做才能解决这个问题？我在这里尝试了答案：Opengl drawing a 2d overlay on a 3d scene problem但它对我不起作用。这是我的代码：
public class GunCraft {
private boolean done = false;
Texture texture;
Camera cam;
private float yspeed;
float legAngle;
float playerX = 0;
float playerZ = 0;
float playerSpeed = 0.01f;
float enemyX = 0;
float enemyZ = 0;
private TrueTypeFont font2;
public static void main(String args[]) {
GunCraft gc = new GunCraft();
gc.run();
}
public void run() {
try {
init();
while (!done) {
mainloop();
render();
Display.update();
}
cleanup();
}
catch (Exception e) {
e.printStackTrace();
System.exit(0);
}
}
/**
* Very basic for first lesson. Just check for escape key or user
* clicking to close the window.
*/
private void mainloop() {
if(Keyboard.isKeyDown(Keyboard.KEY_ESCAPE)) { // Exit if Escape is pressed
done = true;
}
if(Display.isCloseRequested()) { // Exit if window is closed
done = true;
}
}
/**
* For rendering all objects to the screen
* @return boolean for success or not
*/
private void render() {
GL11.glClear(GL11.GL_COLOR_BUFFER_BIT | GL11.GL_DEPTH_BUFFER_BIT); // Clear The Screen And The Depth Buffer
font2.drawString(100, 100, "NICE LOOKING FONTS!", Color.green);
loadIdentity();
//GL11.glRotatef(yspeed,0.0f,1.0f,0.0f);
drawRect(texture, 1f, 1f, 1f);
}
public void loadIdentity(){
GL11.glLoadIdentity();
GL11.glMatrixMode(GL11.GL_MODELVIEW);
float camAngle = (float) Math.atan2(playerX, playerZ);
float radius = 5;
GLU.gluLookAt(playerX + (float)(Math.sin(camAngle) * radius), 0, playerZ + (float)(Math.cos(camAngle) * radius), 0, 0, 0, 0, 1, 0);
//GL11.glGetMatrix();
}
public void drawRect(Texture texture, float width, float height, float depth){
texture.bind();
GL11.glBegin(GL11.GL_QUADS); // Start Drawing Quads
// Front Face
GL11.glNormal3f( 0.0f, 0.0f, 1.0f); // Normal Pointing Towards Viewer
GL11.glTexCoord2f(0.0f, 0.0f); GL11.glVertex3f(-width, -height, depth); // Point 1 (Front)
GL11.glTexCoord2f(1.0f, 0.0f); GL11.glVertex3f( width, -height, depth); // Point 2 (Front)
GL11.glTexCoord2f(1.0f, 1.0f); GL11.glVertex3f( width, height, depth); // Point 3 (Front)
GL11.glTexCoord2f(0.0f, 1.0f); GL11.glVertex3f(-width, height, depth); // Point 4 (Front)
// Back Face
GL11.glNormal3f( 0.0f, 0.0f,-1.0f); // Normal Pointing Away From Viewer
GL11.glTexCoord2f(1.0f, 0.0f); GL11.glVertex3f(-width, -height, -depth); // Point 1 (Back)
GL11.glTexCoord2f(1.0f, 1.0f); GL11.glVertex3f(-width, height, -depth); // Point 2 (Back)
GL11.glTexCoord2f(0.0f, 1.0f); GL11.glVertex3f( width, height, -depth); // Point 3 (Back)
GL11.glTexCoord2f(0.0f, 0.0f); GL11.glVertex3f( width, -height, -depth); // Point 4 (Back)
// Top Face
GL11.glNormal3f( 0.0f, 1.0f, 0.0f); // Normal Pointing Up
GL11.glTexCoord2f(0.0f, 1.0f); GL11.glVertex3f(-width, height, -depth); // Point 1 (Top)
GL11.glTexCoord2f(0.0f, 0.0f); GL11.glVertex3f(-width, height, depth); // Point 2 (Top)
GL11.glTexCoord2f(1.0f, 0.0f); GL11.glVertex3f( width, height, depth); // Point 3 (Top)
GL11.glTexCoord2f(1.0f, 1.0f); GL11.glVertex3f( width, height, -depth); // Point 4 (Top)
// Bottom Face
GL11.glNormal3f( 0.0f,-1.0f, 0.0f); // Normal Pointing Down
GL11.glTexCoord2f(1.0f, 1.0f); GL11.glVertex3f(-width, -height, -depth); // Point 1 (Bottom)
GL11.glTexCoord2f(0.0f, 1.0f); GL11.glVertex3f( width, -height, -depth); // Point 2 (Bottom)
GL11.glTexCoord2f(0.0f, 0.0f); GL11.glVertex3f( width, -height, depth); // Point 3 (Bottom)
GL11.glTexCoord2f(1.0f, 0.0f); GL11.glVertex3f(-width, -height, depth); // Point 4 (Bottom)
// Right face
GL11.glNormal3f( 1.0f, 0.0f, 0.0f); // Normal Pointing Right
GL11.glTexCoord2f(1.0f, 0.0f); GL11.glVertex3f( width, -height, -depth); // Point 1 (Right)
GL11.glTexCoord2f(1.0f, 1.0f); GL11.glVertex3f( width, height, -depth); // Point 2 (Right)
GL11.glTexCoord2f(0.0f, 1.0f); GL11.glVertex3f( width, height, depth); // Point 3 (Right)
GL11.glTexCoord2f(0.0f, 0.0f); GL11.glVertex3f( width, -height, depth); // Point 4 (Right)
// Left Face
GL11.glNormal3f(-1.0f, 0.0f, 0.0f); // Normal Pointing Left
GL11.glTexCoord2f(0.0f, 0.0f); GL11.glVertex3f(-width, -height, -depth); // Point 1 (Left)
GL11.glTexCoord2f(1.0f, 0.0f); GL11.glVertex3f(-width, -height, depth); // Point 2 (Left)
GL11.glTexCoord2f(1.0f, 1.0f); GL11.glVertex3f(-width, height, depth); // Point 3 (Left)
GL11.glTexCoord2f(0.0f, 1.0f); GL11.glVertex3f(-width, height, -depth); // Point 4 (Left)
GL11.glEnd(); // Done Drawing The Quad
}
/**
* Create a window for all display
* @throws Exception
*/
private void createWindow() throws Exception {
Display.setFullscreen(false);
Display.setDisplayMode(new DisplayMode(640, 480));
Display.setTitle("GunCraft - By William Starkovich");
Display.create();
}
/**
* Initialize the environment
* @throws Exception
*/
private void init() throws Exception {
createWindow();
try{
FileInputStream fis;
fis = new FileInputStream(new File("font.ttf"));
Font awtFont2 = Font.createFont(Font.TRUETYPE_FONT, fis);
awtFont2 = awtFont2.deriveFont(24f); // set font size
font2 = new TrueTypeFont(awtFont2, false);
} catch (Exception e) {
e.printStackTrace();
}
initGL(640,480);
}
/**
* Initialize OpenGL
*
*/
private void initGL(int width, int height) {
GL11.glEnable(GL11.GL_TEXTURE_2D); // Enable Texture Mapping
GL11.glShadeModel(GL11.GL_SMOOTH); // Enable Smooth Shading
GL11.glClearColor(0.0f, 0.0f, 0.0f, 0.0f); // Black Background
GL11.glClearDepth(1.0); // Depth Buffer Setup
GL11.glEnable(GL11.GL_DEPTH_TEST); // Enables Depth Testing
GL11.glDepthFunc(GL11.GL_LEQUAL); // The Type Of Depth Testing To Do
GL11.glMatrixMode(GL11.GL_PROJECTION); // Select The Projection Matrix
GL11.glLoadIdentity(); // Reset The Projection Matrix
// Calculate The Aspect Ratio Of The Window
GLU.gluPerspective(
45.0f,
(float) Display.getDisplayMode().getWidth() / (float) Display.getDisplayMode().getHeight(),
0.1f,
100.0f);
//GLU.gluLookAt(eyex, eyey, eyez, centerx, centery, centerz, upx, upy, upz)
GL11.glMatrixMode(GL11.GL_MODELVIEW); // Select The Modelview Matrix
// Really Nice Perspective Calculations
GL11.glHint(GL11.GL_PERSPECTIVE_CORRECTION_HINT, GL11.GL_NICEST);
GL11.glEnable(GL11.GL_BLEND);
GL11.glBlendFunc(GL11.GL_SRC_ALPHA, GL11.GL_ONE_MINUS_SRC_ALPHA);
GL11.glMatrixMode(GL11.GL_PROJECTION);
GL11.glLoadIdentity();
GL11.glOrtho(0, width, height, 0, -1000, 1000);
GL11.glMatrixMode(GL11.GL_MODELVIEW);
GL11.glDisable(GL11.GL_CULL_FACE);
try {
texture = TextureLoader.getTexture("PNG", ResourceLoader.getResourceAsStream("tex.png"));
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* Cleanup all the resources.
*
*/
private void cleanup() {
Display.destroy();
}
}
答案 0 :(得分：4)
你应该仔细研究OpenGL是如何工作的，你的代码中有一堆截断的语句，以后会被覆盖几行。你必须得到“OpenGL是状态机”的意思。如果你不想处理它，你应该找到一个更抽象的游戏引擎来处理所有的绘制调用。
我只是将你的render（）和loadIdentity（）方法复制到工作中，但这不是真正的解决方案。 （每帧重新创建投影矩阵而不是保存/加载它们并不聪明）。 OpenGL 1.1也非常不赞成，强烈建议不要使用立即模式。
private void render() {
GL11.glClear(GL11.GL_COLOR_BUFFER_BIT | GL11.GL_DEPTH_BUFFER_BIT); // Clear The Screen And The Depth Buffer
loadIdentity();
GL11.glRotatef(yspeed++,0.0f,1.0f,0.0f);
drawRect(texture, 1f, 1f, 1f);
GL11.glMatrixMode(GL11.GL_PROJECTION);
GL11.glLoadIdentity();
GL11.glOrtho(0, 640, 480, 0, -1000, 1000);
GL11.glMatrixMode(GL11.GL_MODELVIEW);
GL11.glLoadIdentity();
font2.drawString(100, 100, "NICE LOOKING FONTS!", Color.green);
}
public void loadIdentity(){
GL11.glMatrixMode(GL11.GL_PROJECTION); // Select The Projection Matrix
GL11.glLoadIdentity(); // Reset The Projection Matrix
// Calculate The Aspect Ratio Of The Window
GLU.gluPerspective(
45.0f,
(float) Display.getDisplayMode().getWidth() / (float) Display.getDisplayMode().getHeight(),
0.1f,
100.0f);
GL11.glMatrixMode(GL11.GL_MODELVIEW);
GL11.glLoadIdentity();
float camAngle = (float) Math.atan2(playerX, playerZ);
float radius = 5;
GLU.gluLookAt(playerX + (float)(Math.sin(camAngle) * radius), 0, playerZ + (float)(Math.cos(camAngle) * radius), 0, 0, 0, 0, 1, 0);
//GL11.glGetMatrix();
}