The problem
I am having trouble rendering absolutely anything with LWJGL 3.
It will not render anything, whilst creating the GLFW display and clearing the
color successfully.
The tools
Eclipse Neon (Java IDE)
LWJGL 3.1.1 build 16 with GLFW, JAWT and OPENGL bindings, natives.
The code
package init;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import java.nio.IntBuffer;
import org.lwjgl.glfw.GLFWErrorCallback;
import org.lwjgl.glfw.GLFWVidMode;
import org.lwjgl.opengl.GL;
import org.lwjgl.system.MemoryStack;
import exception.ExceptionHandler;
import util.Time;
import static org.lwjgl.glfw.Callbacks.*;
import static org.lwjgl.glfw.GLFW.*;
import static org.lwjgl.opengl.GL11.*;
import static org.lwjgl.system.MemoryStack.*;
public class DisplayInstance {
public String title = "The SuperMatrix";
public GraphicsDevice gd;
public Game game;
public Config conf;
private long display;
private GLFWErrorCallback glfwerrorcallback;
public DisplayInstance(Game game) {
this.gd = GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevice();
this.game = game;
this.conf = Config.returnConfig(this);
this.glfwerrorcallback = GLFWErrorCallback.createPrint(System.err);
this.glfwerrorcallback.set();
this.start();
}
public void start() {
if (!glfwInit())
ExceptionHandler.handleException(new IllegalStateException("Cannot initialize GLFW"));
glfwDefaultWindowHints();
glfwWindowHint(GLFW_VISIBLE, GLFW_FALSE);
glfwWindowHint(GLFW_RESIZABLE, GLFW_FALSE);
this.display = glfwCreateWindow(this.conf.width, this.conf.height, this.title, 0, 0);
if (this.display == 0L) {
ExceptionHandler.handleException(new RuntimeException("Cannot create GLFW window"));
}
System.out.println(this.display);
try (MemoryStack stack = stackPush()) {
IntBuffer pWidth = stack.mallocInt(1);
IntBuffer pHeight = stack.mallocInt(1);
glfwGetWindowSize(this.display, pWidth, pHeight);
GLFWVidMode mode = glfwGetVideoMode(glfwGetPrimaryMonitor());
glfwSetWindowPos(this.display,
(mode.width()-pWidth.get(0))/2,
(mode.height()-pHeight.get(0))/2
);
} catch (Exception e) {
ExceptionHandler.handleException(e);
}
glfwMakeContextCurrent(this.display);
glfwSwapInterval(1);
glfwShowWindow(this.display);
this.loop();
}
public void loop() {
GL.createCapabilities();
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(0,this.conf.width, 0, this.conf.height, -1, 1);
glMatrixMode(GL_MODELVIEW);
glDisable(GL_DEPTH_TEST);
Time time = new Time();
while(!glfwWindowShouldClose(this.display)) {
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glfwSwapBuffers(this.display);
glfwPollEvents();
glPushMatrix();
glBegin(GL_QUADS);
glColor3f(1,0,1);
glVertex2f(0, 0);
glVertex2f(0, 64);
glVertex2f(64, 64);
glVertex2f(64, 0);
glEnd();
glPopMatrix();
float deltaSeconds = time.getDelta()/Time.SECOND;
float fps = deltaSeconds;
System.out.println(fps);
}
this.destroy();
}
public void destroy() {
glfwFreeCallbacks(this.display);
glfwDestroyWindow(this.display);
glfwTerminate();
this.glfwerrorcallback.free();
this.game.stopGame();
}
}
Thank you. Absolutely any help would be appreciated.
Alright, I finally found the answer.
The cause of the problem
The problem was that I called glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT) right before I called glfwSwapBuffers(this.display):
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glfwSwapBuffers(this.display);
This essentially means that I clear the buffers right before I show them.
The fix
To fix this, all I had to do is move glfwSwapBuffers(this.display) down to after the glPopMatrix() call. Here is how the loop() function looks like now:
GL.createCapabilities();
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(0,this.conf.width, 0, this.conf.height, -1, 1);
glMatrixMode(GL_MODELVIEW);
glDisable(GL_DEPTH_TEST);
Time time = new Time();
while(!glfwWindowShouldClose(this.display)) {
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glfwPollEvents();
glPushMatrix();
glBegin(GL_QUADS);
glColor3f(1,0,1);
glVertex2f(0, 0);
glVertex2f(0, 64);
glVertex2f(64, 64);
glVertex2f(64, 0);
glEnd();
glPopMatrix();
glfwSwapBuffers(this.display);
float deltaSeconds = time.getDelta()/Time.SECOND;
float fps = deltaSeconds;
System.out.println(fps);
}
this.destroy();
Everybody, have a great day!
P.S. Please don't mind the FPS system, I'm still trying to figure it out.
Related
(This is the second time I am asking this question. Last time I got one answer that didn't solve it (the answer there referred a bit of code that was left accidentally from one of my attempts at fixing this). I also changed the question itself slightly - I changed the order of code to put the part where I believe the mistake higher is and added that I am using macOS, which might be the reason that it doesn't work).
So, I just started learning LWJGL 3 and I used a mixture of a couple of tutorials and example code to make something that should render a rectangle to a magenta screen using VAOs and VBOs. There are no errors but the rectangle doesn't appear on screen (all I can see is a magenta screen). I tried using the old LWJGL pipeline (glBegin() and glEnd()) and it does work so I tried changing random things in the rendering code and the loading to VAOs and VBOs. I also tried to bind the VBO too but it didn't change anything. I also tried debugging and it seems like there is a VAO and a VBO that is created.
Can someone take a look at my code and see if something looks wrong? Here it is (sorry if its a bit messy. Like I said, I don't think the problem is in the Main or Window class but I have no idea about LWJGL so I wanted to put it here anyways. If you have time, please also look at them. Otherwise I would really appreciate it if you could look at the Loader and Renderer classes):
(Btw, I am using macOS, and I do have -XstartOnFirstThread on).
The Raw Model class:
package engine.io;
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;
}
}
The loader class:
package engine.io;
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;
import org.lwjgl.system.MemoryUtil;
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);
}
private FloatBuffer storeDataInFloatBuffer(float[] data) {
FloatBuffer buffer = MemoryUtil.memAllocFloat(data.length);
buffer.put(data);
buffer.flip();
return buffer;
}
public void cleanUp() {
for (int vao : vaos) {
GL30.glDeleteVertexArrays(vao);
}
for (int vbo : vbos) {
GL15.glDeleteBuffers(vbo);
}
}
}
The renderer class:
package engine.io;
import org.lwjgl.opengl.GL11;
import org.lwjgl.opengl.GL15;
import org.lwjgl.opengl.GL20;
import org.lwjgl.opengl.GL30;
public class Renderer {
public void prepare() {
GL11.glClear(GL11.GL_COLOR_BUFFER_BIT);
GL11.glClearColor(1f, 0f, 1f, 1f);
}
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);
}
}
Here is the Main class:
import org.lwjgl.*;
import org.lwjgl.glfw.*;
import org.lwjgl.opengl.*;
import org.lwjgl.system.*;
import engine.io.Loader;
import engine.io.RawModel;
import engine.io.Renderer;
import engine.io.Window;
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 Window window;
Loader loader = new Loader();
Renderer renderer = new Renderer();
float[] vertices = {
// Left bottom triangle
-0.5f, 0.5f, 0f,
-0.5f, -0.5f, 0f,
0.5f, -0.5f, 0f,
// Right top triangle
0.5f, -0.5f, 0f,
0.5f, 0.5f, 0f,
-0.5f, 0.5f, 0f
};
RawModel model;
public void run() {
setup();
loop();
loader.cleanUp();
glfwFreeCallbacks(window.getWindowNum());
glfwDestroyWindow(window.getWindowNum());
glfwTerminate();
glfwSetErrorCallback(null).free();
}
private void loop() {
while ( !glfwWindowShouldClose(window.getWindowNum()) ) {
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // clear the framebuffer
renderer.render(model);
glfwSwapBuffers(window.getWindowNum()); // swap the color buffers
glfwPollEvents();
}
}
public void setup() {
window = new Window(900, 300, "Flappy Bird");
window.create();
GL.createCapabilities();
GLFW.glfwMakeContextCurrent(window.getWindowNum());
model = loader.loadToVAO(vertices);
renderer.prepare();
GL11.glViewport(0, 0, 900, 300);
}
public static void main(String[] args) {
new Main().run();
}
}
Here is the window class:
package engine.io;
import static org.lwjgl.glfw.GLFW.*;
import static org.lwjgl.opengl.GL11.*;
import static org.lwjgl.system.MemoryStack.stackPush;
import static org.lwjgl.system.MemoryUtil.*;
import java.nio.IntBuffer;
//import static org.lwjgl.glfw.GLFW.*;
import org.lwjgl.glfw.GLFW;
import org.lwjgl.glfw.GLFWErrorCallback;
import org.lwjgl.glfw.GLFWVidMode;
import org.lwjgl.system.MemoryStack;
public class Window {
private int width, height;
private String title;
private long window;
public Window(int width, int height, String title) {
this.width = width;
this.height = height;
this.title = title;
}
public void create() {
GLFWErrorCallback.createPrint(System.err).set();
if (!glfwInit())
throw new IllegalStateException("Unable to initialize GLFW");
// Configure GLFW
glfwDefaultWindowHints(); // optional, the current window hints are already the default
glfwWindowHint(GLFW_VISIBLE, GLFW_FALSE); // the window will stay hidden after creation
glfwWindowHint(GLFW_RESIZABLE, GLFW_TRUE); // the window will be resizable
// Create the window
window = glfwCreateWindow(width, height, "Flappy Bird", NULL, NULL);
if (window == NULL)
throw new RuntimeException("Failed to create the GLFW window");
// Get the thread stack and push a new frame
try (MemoryStack stack = stackPush()) {
IntBuffer pWidth = stack.mallocInt(1); // int*
IntBuffer pHeight = stack.mallocInt(1); // int*
// Get the window size passed to glfwCreateWindow
glfwGetWindowSize(window, pWidth, pHeight);
// Get the resolution of the primary monitor
GLFWVidMode vidmode = glfwGetVideoMode(glfwGetPrimaryMonitor());
// Center the window
glfwSetWindowPos(window, (vidmode.width() - pWidth.get(0)) / 2, (vidmode.height() - pHeight.get(0)) / 2);
} // the stack frame is popped automatically
// Setup a key callback. It will be called every time a key is pressed, repeated
// or released.
glfwSetKeyCallback(window, (window, key, scancode, action, mods) -> {
if (key == GLFW_KEY_ESCAPE && action == GLFW_RELEASE)
glfwSetWindowShouldClose(window, true); // We will detect this in the rendering loop
});
// Make the OpenGL context current
glfwMakeContextCurrent(window);
// Enable v-sync
glfwSwapInterval(1);
// Make the window visible
glfwShowWindow(window);
}
public long getWindowNum() {
return window;
}
}
Since you are on MacOS, I recommend to set up a 3.2 core profile OpenGL Context. See OpenGL Development on OS X:
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 2);
glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, true);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
// Create the window
window = glfwCreateWindow(width, height, "Flappy Bird", NULL, NULL);
I have a simple application that displays a 3D cube that rotates on all axes, and a camera controlled via mouse that allows you to adjust the angle you're looking at the cube.
The entire application works exactly as I want when I use glOrtho, but once I change it to gluPerspective I only get a black screen.
Here is my method to initialize openGL:
public void initializeOpenGL()
{
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(45.0f, ((float)WIDTH) / ((float)HEIGHT), 0.01f, 500f);
//glOrtho(0, 640, 480, 0, 600, -1); //displays everything correctly
glMatrixMode(GL_MODELVIEW);
glEnable(GL_DEPTH_TEST);
}
And then here is my loop method:
public void begin()
{
float degrees = 0;
Mouse.setGrabbed(false);
while(!Display.isCloseRequested())
{
moveCamera(); //calculates the changes in mouse position
GL11.glLoadIdentity();
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
camera.lookThrough(); //applies the changes
glTranslatef((float)WIDTH/2,(float)HEIGHT/2,10f);
glRotatef(degrees++,1f,1f,1f);
glScalef(100,100,100);
drawQuad();
Display.update();
Display.sync(60);
}
Display.destroy();
System.exit(0);
}
I created an image displaying where the camera looks: http://i.imgur.com/9NVSyqj.png
As you can see the camera looks along the -z axis
-> you should try translating the quad to something like:
glTranslatef(0,0, -10f );
Instead of moving the quad to the middle of the Display you move it half the size of the Display in the nowhere of your Landscape
SHORT VERSION: Gist: https://gist.github.com/Chronove/11da12b2635bfc040981
package me.tutorial;
import static org.lwjgl.opengl.GL11.*;
import static org.lwjgl.util.glu.GLU.gluPerspective;
import org.lwjgl.opengl.Display;
import org.lwjgl.opengl.DisplayMode;
/**
* #author Chronove
*/
public class Example {
public static void main(String[] args) throws Exception {
int WIDTH = 600;
int HEIGHT = 400;
// INIT
Display.setDisplayMode(new DisplayMode(WIDTH,HEIGHT));
Display.create();
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(45.0f,(float)(WIDTH / HEIGHT),0.1f,500f);
glMatrixMode(GL_MODELVIEW);
glEnable(GL_DEPTH_TEST);
float degrees = 0;
while(!(Display.isCloseRequested())){
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
glTranslatef(0,0,-10f);
glRotatef(degrees++,0f,0f,1f);
// drawQuad();
{
glBegin(GL_QUADS);
glVertex3f(-1f,-1f,0f);
glVertex3f( 1f,-1f,0f);
glVertex3f( 1f, 1f,0f);
glVertex3f(-1f, 1f,0f);
glEnd();
}
Display.update();
Display.sync(60);
}
Display.destroy();
System.exit(0);
}
}
Hello I have two seperate initialization codes to switch between rendering 2d shapes and (2d) text in lwjgl. If the initialization code for rendering text is executed, the 2d shapes will not be drawn. I tried everything, and I found the problem line: GL11.glBlendFunc(GL11.GL_SRC_ALPHA, GL11.GL_ONE_MINUS_SRC_ALPHA);
After I have done something with the glBlendFunc, I can only render tekst, and switching to the initialization code for rendering 2d shapes won't work anymore.
Here are my 2 codes:
Simple 2d rendering:
GL11.glEnable(GL_BLEND);
GL11.glMatrixMode(GL_PROJECTION);
GL11.glLoadIdentity();
GL11.glOrtho(0, Display.getWidth(), Display.getHeight(), 0, 1, -1);
GL11.glMatrixMode(GL_MODELVIEW);
GL11.glLoadIdentity();
Code for rendering text:
GL11.glEnable(GL11.GL_TEXTURE_2D);
GL11.glShadeModel(GL11.GL_SMOOTH);
GL11.glDisable(GL11.GL_DEPTH_TEST);
GL11.glDisable(GL11.GL_LIGHTING);
GL11.glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
GL11.glClearDepth(1);
GL11.glEnable(GL11.GL_BLEND);
// Problem line
GL11.glBlendFunc(GL11.GL_SRC_ALPHA, GL11.GL_ONE_MINUS_SRC_ALPHA);
GL11.glViewport(0,0, 800, 600);
GL11.glMatrixMode(GL11.GL_MODELVIEW);
GL11.glMatrixMode(GL11.GL_PROJECTION);
GL11.glLoadIdentity();
GL11.glOrtho(0, 800, 600, 0, 1, -1);
GL11.glMatrixMode(GL11.GL_MODELVIEW);
I think the problem is just a wrong OpenGl state, but how can I put the states right?
It's hard to find out the issue without access to your whole code, thus I can just post some guesses:
Do you clear the colour and depth buffer (glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);)?
Do you enable GL_TEXTURE_2D when drawing textures and disable it otherwise?
I use the same blend function and can draw images just fine (it's the most used blend function for drawing images that have transparency).
PS: This are the only settings I use to draw any kind of 2D stuff (I'm using vertex array objects and shaders for rendering though):
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glEnable(GL_MULTISAMPLE);
glEnable(GL_CULL_FACE);
glCullFace(GL_BACK);
glDisable(GL_DEPTH_TEST);
Here is more code
Renderer.java
package game;
import static org.lwjgl.opengl.GL11.GL_BLEND;
import static org.lwjgl.opengl.GL11.GL_COLOR_BUFFER_BIT;
import static org.lwjgl.opengl.GL11.GL_DEPTH_BUFFER_BIT;
import static org.lwjgl.opengl.GL11.GL_DEPTH_TEST;
import static org.lwjgl.opengl.GL11.GL_MODELVIEW;
import static org.lwjgl.opengl.GL11.GL_PROJECTION;
import static org.lwjgl.opengl.GL11.GL_TEXTURE_2D;
import static org.lwjgl.opengl.GL11.glClear;
import static org.lwjgl.opengl.GL11.glEnable;
import static org.lwjgl.opengl.GL11.glLoadIdentity;
import static org.lwjgl.opengl.GL11.glMatrixMode;
import static org.lwjgl.util.glu.GLU.gluPerspective;
import static org.lwjgl.opengl.GL11.GL_CONSTANT_COLOR;
import static org.lwjgl.opengl.GL11.GL_ONE;
import org.lwjgl.opengl.Display;
import org.lwjgl.opengl.GL11;
public class Renderer {
private static boolean in3d = false;
public static void initText2D() {
in3d = false;
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
//GL11.glEnable(GL11.GL_TEXTURE_2D);
GL11.glShadeModel(GL11.GL_SMOOTH);
GL11.glDisable(GL11.GL_DEPTH_TEST);
GL11.glDisable(GL11.GL_LIGHTING);
GL11.glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
GL11.glClearDepth(1);
GL11.glEnable(GL11.GL_BLEND);
GL11.glBlendFunc(GL11.GL_SRC_ALPHA, GL11.GL_ONE_MINUS_SRC_ALPHA);
GL11.glViewport(0,0, 800, 600);
GL11.glMatrixMode(GL11.GL_MODELVIEW);
GL11.glMatrixMode(GL11.GL_PROJECTION);
GL11.glLoadIdentity();
GL11.glOrtho(0, 800, 600, 0, 1, -1);
GL11.glMatrixMode(GL11.GL_MODELVIEW);
}
public static void init2D() {
in3d = false;
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
GL11.glEnable(GL_BLEND);
GL11.glMatrixMode(GL_PROJECTION);
GL11.glLoadIdentity();
GL11.glOrtho(0, Display.getWidth(), Display.getHeight(), 0, 1, -1);
GL11.glMatrixMode(GL_MODELVIEW);
GL11.glLoadIdentity();
GL11.glDisable(GL_TEXTURE_2D);
// Test
//GL11.glBlendFunc(GL_CONSTANT_COLOR, GL_ONE);
}
public static void init3D(float fov, float aspect, float near, float far) {
in3d = true;
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(fov, aspect, near, far);
GL11.glMatrixMode(GL_MODELVIEW);
glEnable(GL_DEPTH_TEST);
glEnable(GL_TEXTURE_2D);
}
public static void begin(int shape) {
GL11.glBegin(shape);
}
public static void end() {
GL11.glEnd();
}
public static void setVertex3(float x, float y, float z) {
if(!in3d) {
System.out.println("[WARNING] > Adding 3d vertex but there is no 3d context");
}
GL11.glVertex3f(x, y, z);
}
public static void setColor(float r, float g, float b) {
GL11.glColor3f(r, g, b);
}
public static void setVertex2(float x, float y) {
if(in3d) {
System.out.println("[WARNING] > Adding 2d vertex while in 3d context");
}
GL11.glVertex2f(x, y);
}
}
Button.java (example of how I draw a button in lwjgl)
package gui;
import static org.lwjgl.opengl.GL11.GL_QUADS;
import static org.lwjgl.opengl.GL11.glBegin;
import static org.lwjgl.opengl.GL11.glEnd;
import static org.lwjgl.opengl.GL11.glVertex2f;
import game.Renderer;
import game.TextRenderer;
import org.lwjgl.opengl.GL11;
public class Button extends AbstractButton {
private String text;
public Button(int x, int y, int w, int h, String text) {
this.setX(x);
this.setY(y);
this.setWidth(w);
this.setHeight(h);
this.text = text;
paintElement();
}
public Button(String text) {
this.text = text;
paintElement();
}
public Button() {
paintElement();
}
public void paintElement() {
Renderer.init2D();
Renderer.begin(GL11.GL_QUADS);
Renderer.setColor(this.getColorR(), this.getColorG(), this.getColorB());
Renderer.setVertex2(this.getX(), this.getY());
Renderer.setVertex2(this.getX() + this.getWidth(), this.getY());
Renderer.setVertex2(this.getX() + this.getWidth(), this.getY() + this.getHeight());
Renderer.setVertex2(this.getX(), this.getY() + this.getHeight());
Renderer.end();
Renderer.initText2D();
TextRenderer.drawString(this.getX() + 10, this.getY() + 10, this.text);
}
}
Main.java
package game;
import static org.lwjgl.opengl.GL11.GL_COLOR_BUFFER_BIT;
import static org.lwjgl.opengl.GL11.GL_DEPTH_BUFFER_BIT;
import static org.lwjgl.opengl.GL11.GL_QUADS;
import static org.lwjgl.opengl.GL11.glBegin;
import static org.lwjgl.opengl.GL11.glClear;
import static org.lwjgl.opengl.GL11.glColor3f;
import static org.lwjgl.opengl.GL11.glEnd;
import static org.lwjgl.opengl.GL11.glLoadIdentity;
import static org.lwjgl.opengl.GL11.glMatrixMode;
import static org.lwjgl.opengl.GL11.glOrtho;
import static org.lwjgl.opengl.GL11.glVertex2f;
import java.awt.Font;
import gui.Button;
import org.lwjgl.LWJGLException;
import org.lwjgl.opengl.Display;
import org.lwjgl.opengl.DisplayMode;
import org.lwjgl.opengl.GL11;
import org.newdawn.slick.Color;
import org.newdawn.slick.TrueTypeFont;
public class Main {
private int gamestate;
private boolean closeRequested;
private static Camera cam;
private static User user;
public Main() {
createUser();
createDisplay();
createCamera();
gameLoop();
cleanUp();
}
private void createUser() {
}
private void createDisplay() {
try {
Display.setDisplayMode(new DisplayMode(800, 600));
Display.setResizable(true);
Display.create();
} catch (LWJGLException e) {
e.printStackTrace();
}
}
private void createCamera() {
}
private void gameLoop() {
while(!closeRequested) {
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
//Renderer.init2D();
/*
// Test 2d line
Renderer.init2D();
Renderer.setColor(1.0f, 1.0f, 1.0f);
Renderer.begin(GL11.GL_LINE);
Renderer.setVertex2(0, 0);
Renderer.setVertex2(100, 100);
Renderer.end();
*/
// set the color of the quad (R,G,B,A)
glColor3f(0.7f, 0.5f, 1.0f);
// draw quad
glBegin(GL_QUADS);
glVertex2f(100,100);
glVertex2f(100+200,100);
glVertex2f(100+200,100+200);
glVertex2f(100,100+200);
glEnd();
checkInput();
Button b = new Button(100, 100, 100, 30, "Test");
Display.update();
Display.sync(10);
}
return;
}
private void checkInput() {
// Check keyboard, mouse and other input
if(Display.isCloseRequested()) {
closeRequested = true;
}
return;
}
private void cleanUp() {
}
public static void main(String[] args) {
new Main();
}
}
I got it working!
This is my new (working) code:
init2d
GL11.glEnable(GL_BLEND);
GL11.glMatrixMode(GL_PROJECTION);
GL11.glLoadIdentity();
GL11.glOrtho(0, Display.getWidth(), Display.getHeight(), 0, 1, -1);
GL11.glMatrixMode(GL_MODELVIEW);
GL11.glLoadIdentity();
// solution
GL11.glBindTexture(GL11.GL_TEXTURE_2D, 0);
initText2d
GL11.glEnable(GL11.GL_TEXTURE_2D);
GL11.glShadeModel(GL11.GL_SMOOTH);
GL11.glDisable(GL11.GL_DEPTH_TEST);
GL11.glDisable(GL11.GL_LIGHTING);
GL11.glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
GL11.glClearDepth(1);
GL11.glEnable(GL11.GL_BLEND);
GL11.glBlendFunc(GL11.GL_SRC_ALPHA, GL11.GL_ONE_MINUS_SRC_ALPHA);
GL11.glViewport(0,0, 800, 600);
GL11.glMatrixMode(GL11.GL_MODELVIEW);
GL11.glMatrixMode(GL11.GL_PROJECTION);
GL11.glLoadIdentity();
GL11.glOrtho(0, 800, 600, 0, 1, -1);
GL11.glMatrixMode(GL11.GL_MODELVIEW);
I think the problem was that slick uses textures for text rendering, and I had to enable the textures or bind them to 0.
See this: http://lwjgl.org/forum/index.php?topic=4019.0
I use eclipse. so in my workspace, under my project, i create a new folder "res" with a subfolder "images" that have all my png's for use as textures. so here is the method im using for loading the textures:
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.FileNotFoundException;
import org.lwjgl.LWJGLException;
import org.lwjgl.opengl.Display;
import org.lwjgl.opengl.DisplayMode;
import org.lwjgl.opengl.GL11;
import org.newdawn.slick.Color;
import org.newdawn.slick.opengl.Texture;
import org.newdawn.slick.opengl.TextureLoader;
import org.newdawn.slick.util.ResourceLoader;
import org.lwjgl.input.Mouse;
import java.util.Random;
public class TextureDemo
{
public int count = 0;
private static Texture wood;
Random random = new Random();
public TextureDemo()
{
initGL(640, 480, "SLICK TEXTURES");
loadTexture("mozilla");
int x = 100, y = 100, count = 0, width = 0, height = 0, counter = 10;
while(true)
{
count++;
if(count == counter)
{
x--; y--; width++; height++; counter += random.nextInt(50) + 1;
}
render(x, y, width, height);
Display.update();
Display.sync(60);
if(Display.isCloseRequested())
{
Display.destroy();
System.exit(0);
}
}
}
private void initGL(int width, int height, String title)
{
try
{
Display.setDisplayMode(new DisplayMode(width, height));
Display.setTitle(title);
Display.create();
}
catch(LWJGLException e)
{
e.printStackTrace();
Display.destroy();
System.exit(1);
}
GL11.glMatrixMode(GL11.GL_PROJECTION);
GL11.glClearColor(0.5f, 0.5f, 0.5f, 1.0f);
GL11.glDisable(GL11.GL_COLOR_MATERIAL);
GL11.glLoadIdentity();
GL11.glOrtho(0, width, height, 0, 1, -1);
GL11.glMatrixMode(GL11.GL_MODELVIEW);
GL11.glEnable(GL11.GL_BLEND);
GL11.glBlendFunc(GL11.GL_SRC_ALPHA, GL11.GL_ONE_MINUS_SRC_ALPHA);
}
public void loadTexture(String key)
{
try
{
wood = TextureLoader.getTexture("PNG", ResourceLoader.getResourceAsStream("./res/images/"+key+".png"));
System.out.println("working." + wood.getTextureID());
}
catch(FileNotFoundException e)
{
e.printStackTrace();
Display.destroy();
System.exit(1);
}
catch(IOException e)
{
e.printStackTrace();
}
}
public void render(int x, int y, int width, int height)
{
GL11.glClear(GL11.GL_COLOR_BUFFER_BIT);
GL11.glEnable(GL11.GL_BLEND);
GL11.glBlendFunc(GL11.GL_SRC_ALPHA, GL11.GL_ONE_MINUS_SRC_ALPHA);
System.out.println("working." + wood.getTextureID());
GL11.glBindTexture(GL11.GL_TEXTURE_2D, wood.getTextureID());
GL11.glBegin(GL11.GL_QUADS);
GL11.glTexCoord2f(0, 0);
GL11.glVertex2f(x, y);
GL11.glTexCoord2f(1, 0);
GL11.glVertex2f(x + wood.getImageWidth(), y);
GL11.glTexCoord2f(1, 1);
GL11.glVertex2f(x + wood.getImageWidth(), y + wood.getImageHeight());
GL11.glTexCoord2f(0, 1);
GL11.glVertex2f(x, y + wood.getImageHeight());
GL11.glEnd();
GL11.glDisable(GL11.GL_BLEND);
System.out.println(wood.getHeight()+ " " +wood.getWidth());
}
public static void main (String[] args)
{
new TextureDemo();
}
}
WHY WHY WHY are my textures black lol? I really don't understand how my code did this. Is it possible that my computer could have problems that are causing that?
Asking the same question twice won't help. However, you should make sure you first call glBindTexture, before you start glBegin.
I'm sorry, however there are many problems with your code. I would recommend taking a look at some opengl tutorials. The arcsynthesis one is very in-depth.
Your problem is that the texture "wood" is never bound to opengl.
In order to bind your texture to the opengl context you must call
glBindTexture(GL_TEXTURE_2D, id);
before glbegin()
The id is the texture id generated by glGentextures or in your case the slick util method.
Also what is wood? In the first code block it is the texture id but in the second block you are calling 'getHeght()' on type wood. I am confused as to what 'wood' is.
Either way, you need to bind the texture for opengl to use it and I again recommending looking at a few tutorials on the opengl basics.
You haven't enabled textures!
In your initGL method call GL11.glEnable(GL11.GL_TEXTURE_2D).
The problem i am encountering is that i cannot get my texture to render in the correct proportions and for some reason the texture is also repeating itself with a space inbetween.
this is the texture im using(i am trzing to fill the screen with this texture):
When rendered it looks like this(red outline is the entire screen and texture is rendered with a 1 px border):
and here is the code:
package game;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import org.lwjgl.input.Keyboard;
import org.lwjgl.opengl.Display;
import org.lwjgl.opengl.DisplayMode;
import org.lwjgl.opengl.GL11;
import org.lwjgl.util.Timer;
import org.lwjgl.util.glu.GLU;
import org.newdawn.slick.opengl.TextureLoader;
public class WarZone {
private boolean done = false;
private String windowTitle = "War Zone";
private DisplayMode displayMode;
private Timer timer;
private float dt;
public static void main(String[] args) {
new WarZone().run(false);
}
public void run(boolean fullscreen) {
try {
init();
switchToOrtho();
while (!done) {
timer.tick();
update();
render();
Display.update();
}
cleanup();
} catch (Exception e) {
e.printStackTrace();
System.exit(0);
}
}
private void update() {
// Exit if Escape is pressed or window is closed
if (Keyboard.isKeyDown(Keyboard.KEY_ESCAPE) || Display.isCloseRequested()) {
done = true;
return;
}
}
private boolean render() {
GL11.glClear(GL11.GL_COLOR_BUFFER_BIT | GL11.GL_DEPTH_BUFFER_BIT); // Clear the screen and the depth buffer
GL11.glLoadIdentity(); // Reset the current modelview matrix
int w = displayMode.getWidth();
int h = displayMode.getHeight();
GL11.glColor3f(1, 0, 0);
GL11.glBindTexture(GL11.GL_TEXTURE_2D, 0);
GL11.glBegin(GL11.GL_QUADS);
GL11.glVertex2i(0, 0);
GL11.glVertex2i(w, 0);
GL11.glVertex2i(w, h);
GL11.glVertex2i(0, h);
GL11.glEnd();
//if(true)return false;
GL11.glColor3f(0, 1, 1);
GL11.glBindTexture(GL11.GL_TEXTURE_2D, 1);
GL11.glBegin(GL11.GL_QUADS);
GL11.glTexCoord2f(0, 0);
GL11.glVertex2i(1, 1);
GL11.glTexCoord2f(1, 0);
GL11.glVertex2i(w - 1, 1);
GL11.glTexCoord2f(1, 1);
GL11.glVertex2i(w - 1, h - 1);
GL11.glTexCoord2f(0, 1);
GL11.glVertex2i(1, h - 1);
GL11.glEnd();
return true; // Rendered correctly
}
public static void switchToOrtho() {
GL11.glDisable(GL11.GL_DEPTH_TEST);
GL11.glDisable(GL11.GL_LIGHTING);
GL11.glMatrixMode(GL11.GL_PROJECTION);
GL11.glPushMatrix();
GL11.glLoadIdentity();
GL11.glOrtho(0, Display.getDisplayMode().getWidth(), 0, Display.getDisplayMode().getHeight(), -1, 1);
GL11.glMatrixMode(GL11.GL_MODELVIEW);
GL11.glLoadIdentity();
}
public static void switchToFrustum() {
GL11.glEnable(GL11.GL_DEPTH_TEST);
GL11.glEnable(GL11.GL_LIGHTING);
GL11.glMatrixMode(GL11.GL_PROJECTION);
GL11.glPopMatrix();
GL11.glMatrixMode(GL11.GL_MODELVIEW);
}
private void init() throws Exception {
createWindow();
initGL();
load();
}
private void load() throws FileNotFoundException, IOException {
TextureLoader.getTexture("BMP", new FileInputStream("res/temp/Main_Menu_Play_Button.bmp"), true).getTextureID();
}
private void createWindow() throws Exception {
DisplayMode availibleDisplayModes[] = Display.getAvailableDisplayModes();
for (DisplayMode d:availibleDisplayModes) {
if (d.getWidth() == 640 && d.getHeight() == 480 && d.getBitsPerPixel() == 32) {
displayMode = d;
break;
}
}
Display.setDisplayMode(displayMode);
Display.setTitle(windowTitle);
Display.create();
}
private void initGL() {
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(1.0f); // Depth buffer setup
GL11.glEnable(GL11.GL_DEPTH_TEST); // Enables depth testing
GL11.glDepthFunc(GL11.GL_LEQUAL); // Type of depth testing
GL11.glMatrixMode(GL11.GL_PROJECTION); // Select projection matrix
GL11.glLoadIdentity(); // Reset the projection matrix
// Calculate the aspect ratio of the window
GLU.gluPerspective(45.0f, (float)displayMode.getWidth() / (float)displayMode.getHeight(), 0.1f, 100.0f);
GL11.glMatrixMode(GL11.GL_MODELVIEW);// Select the modelview matrix
GL11.glHint(GL11.GL_PERSPECTIVE_CORRECTION_HINT, GL11.GL_NICEST);// Most precise perspective calculations
}
public void requestFinish() {
done = true;
}
private void cleanup() {
Display.destroy();
}
}
I would reallz appreciate it if someone could tell me what i had done wrong.
First, I don't know what TextureLoader or newdawn.slick.opengl are, so there is only limited information I can give about this.
However, it is very possible that your texture loading code does not know how to handle non-power-of-two textures. Which means it is likely padding the texture's size out to the nearest power of two.
More importantly is this:
GL11.glColor3f(0, 1, 1);
GL11.glBindTexture(GL11.GL_TEXTURE_2D, 1);
GL11.glBegin(GL11.GL_QUADS);
GL11.glTexCoord2f(0, 0);
GL11.glVertex2i(1, 1);
GL11.glTexCoord2f(1, 0);
GL11.glVertex2i(w - 1, 1);
GL11.glTexCoord2f(1, 1);
GL11.glVertex2i(w - 1, h - 1);
GL11.glTexCoord2f(0, 1);
GL11.glVertex2i(1, h - 1);
GL11.glEnd();
This will draw a screen-sized quad (assuming that w and h are screen sizes). This quad maps the entire area of the texture to this quad. OpenGL is only doing what you told it to do: take the texture and map it to the quad.
If you want to draw a texture with pixel accuracy (1:1 texel to pixel), then you need to provide a width and height to the vertex positions that is equal to the texture's size, not the screen size.
Also, you set the color to (0, 1, 1). The default texture environment will multiply the per-vertex color by the texel values fetched from the texture. So you should either set the color to white, or change the texture environment.
OpenGL Doesn't like textures that are not powers of two if I recall. Is your texture a power of 2 for both height and width?
http://www.gamedev.net/topic/466904-opengl-textures-only-power-of-two/