This is quote from old thread:
Quote from: tris on June 24, 2010, 16:26:39
You can use multiple canvases. Just set the current cavas to be the current gl contex before you draw each one like so:
package com.tscribble.game.examples.swtopengl;
import static org.lwjgl.opengl.GL11.*;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.*;
import com.tscribble.game.opengl.swt.GLComposite2D;
/**
* @author triston
*
*/
public class SWTMultiComposite {
private Display display;
private GLComposite2D canvas,canvas2;
private float ang,ang2 = 0;
public static void main(String[] args) {
SWTMultiComposite window = new SWTMultiComposite();
window.open();
}
public void open() {
display = Display.getDefault();
Shell shell = new Shell();
shell.setSize(1024, 600);
shell.setText("SWT GL Mutiple Composites");
shell.setLayout(new FillLayout(SWT.HORIZONTAL));
Menu mBar = new Menu(shell, SWT.BAR);
shell.setMenuBar(mBar);
MenuItem fileItem = new MenuItem(mBar, SWT.CASCADE);
fileItem.setText("File");
Menu fileMenu = new Menu(fileItem);
fileItem.setMenu(fileMenu);
for (int i = 0; i < 5; i++) {
final MenuItem importItem = new MenuItem(fileMenu, SWT.NONE);
importItem.setText("Item " + i);
}
canvas = new GLComposite2D(shell);
canvas.addListener(SWT.Resize, new Listener() {
public void handleEvent(Event event) {
doResize(canvas);
}});
canvas2 = new GLComposite2D(shell);
canvas2.addListener(SWT.Resize, new Listener() {
public void handleEvent(Event event) {
doResize(canvas2);
}});
shell.open();
start(); // render loop thread
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
display.dispose();
}
protected void initGL() {
glShadeModel(GL_SMOOTH); // Enable Smooth Shading, GL_SMOOTH (the default) or GL_FLAT.
}
private void doResize(GLComposite2D comp) {
Rectangle rec = comp.getBounds();
float w = Math.max(rec.width, 1);
float h = Math.max(rec.height, 1);
comp.makeCurrent();
glViewport(0, 0, (int) w, (int) h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(0, w, h, 0, 1, -1);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
public void start() {
display.syncExec(new Runnable() {
public void run() {
if (!canvas.isDisposed() || !canvas2.isDisposed()) {
try {Thread.sleep(10);}catch (InterruptedException e){}
logic();
logic2();
canvas.makeCurrent();
draw();
canvas2.makeCurrent();
draw2();
canvas.swapBuffers();
canvas2.swapBuffers();
display.asyncExec(this);
}
}
});
}
public void logic() {
ang += 0.5f % 360;
}
public void logic2() {
ang2 -= 0.5f % 360;
}
private void draw() {
glClear(GL_COLOR_BUFFER_BIT);
glClearColor(1.0f, 0.0f, 0.0f, 0.0f); // Red Background
glPushMatrix();
{
glTranslatef(10, 10, 0);
glBegin(GL_TRIANGLES);
glColor3f(1.0f, 0.0f, 0.0f); // red
glVertex2f(5.0f, 5.0f);
glColor3f(0.0f, 1.0f, 0.0f); // green
glVertex2f(400.0f, 5.0f);
glColor3f(0.0f, 0.0f, 1.0f); // blue
glVertex2f(5.0f, 400.0f);
glEnd();
}
glPopMatrix();
}
private void draw2() {
glClear(GL_COLOR_BUFFER_BIT);
glClearColor(0.0f, 0.0f, 1.0f, 0.0f); // Blue Background
glPushMatrix();
{
glTranslatef(10, 10, 0);
glBegin(GL_TRIANGLES);
glColor3f(1.0f, 0.0f, 0.0f); // red
glVertex2f(5.0f, 5.0f);
glColor3f(0.0f, 1.0f, 0.0f); // green
glVertex2f(100.0f, 5.0f);
glColor3f(0.0f, 0.0f, 1.0f); // blue
glVertex2f(5.0f, 100.0f);
glEnd();
}
glPopMatrix();
}
}
The GLComposite
package com.tscribble.game.opengl.swt;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.opengl.GLCanvas;
import org.eclipse.swt.opengl.GLData;
import org.eclipse.swt.widgets.*;
import org.lwjgl.LWJGLException;
import org.lwjgl.opengl.*;
/**
* @author triston
*/
public class GLComposite2D extends GLCanvas {
private static GLData gd1;
protected Rectangle rec;
static {
gd1 = new GLData();
gd1.doubleBuffer = true;
}
public GLComposite2D(Composite parent) {
super(parent, SWT.NONE, gd1);
}
public void makeCurrent() {
setCurrent();
try {
GLContext.useContext(this);
} catch (LWJGLException e) {
e.printStackTrace();
}
}
}
hope that helps
I am sorry - It is not spam just I want continue that because Excelsior works with lwjgl 2.9.3 + swt 4.7.2 fine
And I want know how do I change color of glClearColor()
I have problem with changing color - I have tested with lwjgl 3.1 = no problem with changing color of background's glClearColor()
But how does it work for lwjgl 2.9.3?
Because I really want create powerful program alternative to Xenko GameStudio, Unity3D, MonoGame or WaveEngine. Because I feel sad that C# coders don't believe that because Java is really richer than C# because Java has a lot of features like toRadiant() from Math class, FloatBuffer() etc..
I really want know how does color change of glClearColor() by clicking
Here is code:
import static org.lwjgl.opengl.GL11.*;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.RGB;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.*;
/**
* @author triston
*
*/
public class SwtDemo {
private Display display;
private GLComposite2D canvas;
public static void main(String[] args) {
SwtDemo window = new SwtDemo();
window.open();
}
public void open() {
display = Display.getDefault();
Shell shell = new Shell();
shell.setSize(1024, 600);
shell.setText("SWT GL Changing color for background");
shell.setLayout(new FillLayout(SWT.HORIZONTAL));
Menu menubar = new Menu(shell, SWT.BAR);
MenuItem fileItem = new MenuItem(menubar, SWT.CASCADE);
fileItem.setText("File");
Menu fileMenu = new Menu(fileItem);
fileItem.setMenu(fileMenu);
MenuItem exitItem = new MenuItem(fileMenu, SWT.NONE);
exitItem.setText("Exit");
exitItem.addListener(SWT.Selection, event-> {
shell.getDisplay().dispose();
System.exit(0);
});
MenuItem setupItem = new MenuItem(menubar, SWT.CASCADE);
setupItem.setText("Setup");
Menu setupMenu = new Menu(setupItem);
setupItem.setMenu(setupMenu);
MenuItem changebackgroundItem = new MenuItem(setupMenu, SWT.NONE);
changebackgroundItem.setText("Change background");
new MenuItem(setupMenu, SWT.SEPARATOR);
MenuItem defaultColorForBackgroundItem = new MenuItem(setupMenu, SWT.NONE);
defaultColorForBackgroundItem.setText("Default background color");
changebackgroundItem.addListener(SWT.Selection, event-> {
ColorDialog dialog = new ColorDialog(shell);
RGB rgb = dialog.open();
if(rgb != null)
{
Color col = new Color(shell.getDisplay(), rgb);
glClearColor(col.getRed()/255.0f, col.getGreen()/255.0f, col.getBlue()/255.0f, 1.0f);
col.dispose();
}
});
defaultColorForBackgroundItem.addListener(SWT.Selection, event-> {
glClearColor(1.0f, 0.0f, 0.0f, 0.0f);
});
shell.setMenuBar(menubar);
canvas = new GLComposite2D(shell);
canvas.addListener(SWT.Resize, new Listener() {
public void handleEvent(Event event) {
doResize(canvas);
}});
shell.open();
display.syncExec(new Runnable() {
public void run() {
if (!canvas.isDisposed()) {
logic();
canvas.makeCurrent();
draw();
canvas.swapBuffers();
display.asyncExec(this);
}
}
});
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
display.dispose();
}
protected void initGL() {
glShadeModel(GL_SMOOTH); // Enable Smooth Shading, GL_SMOOTH (the default) or GL_FLAT.
}
private void doResize(GLComposite2D comp) {
Rectangle rec = comp.getBounds();
float w = Math.max(rec.width, 1);
float h = Math.max(rec.height, 1);
comp.makeCurrent();
glViewport(0, 0, (int) w, (int) h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(0, w, h, 0, 1, -1);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
@SuppressWarnings("unused")
public void logic() {
int ans = 0;
ans += 0.5f % 360;
}
private void draw() {
glClear(GL_COLOR_BUFFER_BIT);
glClearColor(1.0f, 0.0f, 0.0f, 0.0f);
glPushMatrix();
{
glTranslatef(10, 10, 0);
glBegin(GL_TRIANGLES);
glColor3f(1.0f, 0.0f, 0.0f); // red
glVertex2f(5.0f, 5.0f);
glColor3f(0.0f, 1.0f, 0.0f); // green
glVertex2f(400.0f, 5.0f);
glColor3f(0.0f, 0.0f, 1.0f); // blue
glVertex2f(5.0f, 400.0f);
glEnd();
}
glPopMatrix();
}
}How do I get working with lwjgl 2.9.3?
Thanks!
Simply do not reset the clear color in line 141 in the draw() method: glClearColor(1.0f, 0.0f, 0.0f, 0.0f);