I'm new to LWJGL so bear with me.
I have 2 programs that are almost identicle except for on small section. One of them displays the quad. The other one does not.
Here is the one that works..
package com.gthought.swing;
import org.lwjgl.DisplayMode;
import org.lwjgl.Display;
import org.lwjgl.input.Keyboard;
import org.lwjgl.opengl.Window;
import org.lwjgl.opengl.GL11;
public class OpenGLWindow
{
public static void main(String[] args)
{
try
{
int mode = -1;
DisplayMode[] modes = Display.getAvailableDisplayModes();
System.out.println("Found " + modes.length + " display modes");
for (int i = 0; i < modes.length; i++)
{
if (modes[i].width == 640 && modes[i].height == 640 && modes[i].bpp == 16)
{
mode = i;
}
if (mode != -1)
{
Display.setDisplayMode(modes[mode]);
}
}
}
catch(Exception e)
{
}
try
{
Window.create("Test Window");
}
catch(Exception e)
{
}
while(!Window.isCloseRequested())
{
Window.update();
try
{
Thread.sleep(100);
}
catch(Exception ee)
{
}
render();
if (Keyboard.isKeyDown(Keyboard.KEY_ESCAPE))
{
break;
}
}
Window.destroy();
}
private static void render()
{
GL11.glClear(GL11.GL_COLOR_BUFFER_BIT);
GL11.glPushMatrix();
GL11.glTranslatef(Display.getWidth() / 2, Display.getHeight() / 2, 0.0f);
GL11.glRotatef(45f, 0, 0, 1.0f);
GL11.glBegin(GL11.GL_QUADS);
GL11.glVertex2i(-50, -50);
GL11.glVertex2i(50, -50);
GL11.glVertex2i(50, 50);
GL11.glVertex2i(-50, 50);
GL11.glEnd();
GL11.glPopMatrix();
}
}
This puts the display in full screen mode and I can see my quad. But I want to work in windowd mode, so I commented out 1 section and changed the Window.create() method like this..
package com.gthought.swing;
import org.lwjgl.DisplayMode;
import org.lwjgl.Display;
import org.lwjgl.input.Keyboard;
import org.lwjgl.opengl.Window;
import org.lwjgl.opengl.GL11;
public class OpenGLWindow
{
public static void main(String[] args)
{
/*
try
{
int mode = -1;
DisplayMode[] modes = Display.getAvailableDisplayModes();
System.out.println("Found " + modes.length + " display modes");
for (int i = 0; i < modes.length; i++)
{
if (modes[i].width == 640 && modes[i].height == 640 && modes[i].bpp == 16)
{
mode = i;
}
if (mode != -1)
{
Display.setDisplayMode(modes[mode]);
}
}
}
catch(Exception e)
{
}
*/
try
{
Window.create("Test Window", 50, 50, 640, 480, 16, 0, 0, 0, 0);
}
catch(Exception e)
{
}
while(!Window.isCloseRequested())
{
Window.update();
try
{
Thread.sleep(100);
}
catch(Exception ee)
{
}
render();
if (Keyboard.isKeyDown(Keyboard.KEY_ESCAPE))
{
break;
}
}
Window.destroy();
}
private static void render()
{
GL11.glClear(GL11.GL_COLOR_BUFFER_BIT);
GL11.glPushMatrix();
GL11.glTranslatef(Display.getWidth() / 2, Display.getHeight() / 2, 0.0f);
GL11.glRotatef(45f, 0, 0, 1.0f);
GL11.glBegin(GL11.GL_QUADS);
GL11.glVertex2i(-50, -50);
GL11.glVertex2i(50, -50);
GL11.glVertex2i(50, 50);
GL11.glVertex2i(-50, 50);
GL11.glEnd();
GL11.glPopMatrix();
}
}
Now, I get the window to appear just fine. But I can't see my quad. Can someone tell me what I am doing wrong?
Thanks.
Gregg
I'm not sure without trying it, but it looks like your Window.update() needs to be called after you render in your loop, not before...
hope this helps :)
something like this:
while(!Window.isCloseRequested())
{
try
{
Thread.sleep(100);
}
catch(Exception ee)
{
}
render();
Window.update();
if (Keyboard.isKeyDown(Keyboard.KEY_ESCAPE))
{
break;
}
}
I'll try it later when I get back from work :lol:
Actually - it doesn't matter where it gets called any more, as it's only called once per loop iteration.
Cas :)
I realized after I posted it that the Window.update() doesn't have to be at the bottom :oops: (and I call myself a programmer :wink: )
anyways....
try changing
GL11.glTranslatef(Display.getWidth() / 2, Display.getHeight() / 2, 0.0f);
to
GL11.glTranslatef(Window.getWidth() / 2, Window.getHeight() / 2, 0.0f);
(I was trying this on version 0.8 so I had to play around with it, but I think that was the thing that made it work.... :roll: )
You're code really helped me get started with LWJGL. You should submit it as a getting started code... or maybe make a few modifications and submit it to nehe tutorials!
Things your skeleton/base code taught me...
1)How to change resolution
2)How to go full screen
3)How to draw a polygon/triangle on the screen.
Thanks!~
LK
I guess what I don't understand is how to detect what Hz to use.
I want a 800x600 16bit full screen mode, but there's many different Hz values.
There is now extremely groovy display mode selector utility class in org.lwjgl.util - have a look in the CVS.
Basically you pass it a bunch of criteria and it tries to pick the display mode that best satisfies your criteria.
Everyone should use it :)
Cas :)
Will do, as soon as it's in a downloadable distro! Until then I'll use me own little class, presented here for your amusement:
package org.padcroft.clt.util;
import org.lwjgl.DisplayMode ;
import java.util.List ;
import java.util.ArrayList ;
import java.util.Iterator ;
import java.util.Collections ;
import java.util.Comparator ;
import java.lang.reflect.Field ;
/**
* @author cfmdobbie
*/
public class DisplayModeFilter
{
// Required DisplayMode settings
private int width = -1 ;
private int height = -1 ;
private int bpp = -1 ;
private int freq = -1 ;
// List of sorts to apply to DisplayModes
private List sortOrder = new ArrayList(10) ;
// Private Comparator class to sort DisplayModes
private static class DisplayModeFieldComparator
implements Comparator
{
private final Field field ;
private final boolean ascending ;
private DisplayModeFieldComparator(final String fieldName, final boolean ascending)
{
try
{
field = DisplayMode.class.getField(fieldName) ;
}
catch(NoSuchFieldException e)
{
throw new AssertionError(e) ;
}
this.ascending = ascending ;
}
public int compare(Object e1, Object e2)
{
DisplayMode dm1 = (DisplayMode)e1 ;
DisplayMode dm2 = (DisplayMode)e2 ;
int f1, f2 ;
try
{
f1 = field.getInt(dm1) ;
f2 = field.getInt(dm2) ;
}
catch(IllegalAccessException e)
{
throw new AssertionError(e) ;
}
if(f1 < f2)
return (ascending ? -1 : 1) ;
else if(f1 > f2)
return (ascending ? 1 : -1) ;
else
return 0 ;
}
}
// Comparators
private static final Comparator WIDTH_ASCENDING = new DisplayModeFieldComparator("width", true) ;
private static final Comparator HEIGHT_ASCENDING = new DisplayModeFieldComparator("height", true) ;
private static final Comparator BPP_ASCENDING = new DisplayModeFieldComparator("bpp", true) ;
private static final Comparator FREQ_ASCENDING = new DisplayModeFieldComparator("freq", true) ;
private static final Comparator WIDTH_DESCENDING = new DisplayModeFieldComparator("width", false) ;
private static final Comparator HEIGHT_DESCENDING = new DisplayModeFieldComparator("height", false) ;
private static final Comparator BPP_DESCENDING = new DisplayModeFieldComparator("bpp", false) ;
private static final Comparator FREQ_DESCENDING = new DisplayModeFieldComparator("freq", false) ;
// Constructor
public DisplayModeFilter()
{
}
// Property setters
public DisplayModeFilter setWidth(final int width) { this.width = width ; return this ; }
public DisplayModeFilter setHeight(final int height) { this.height = height ; return this ; }
public DisplayModeFilter setBpp(final int bpp) { this.bpp = bpp ; return this ; }
public DisplayModeFilter setFreq(final int freq) { this.freq = freq ; return this ; }
// Sorting order functions
public DisplayModeFilter sortByWidthAscending() { sortOrder.add(WIDTH_ASCENDING) ; return this ; }
public DisplayModeFilter sortByHeightAscending() { sortOrder.add(HEIGHT_ASCENDING) ; return this ; }
public DisplayModeFilter sortByBppAscending() { sortOrder.add(BPP_ASCENDING) ; return this ; }
public DisplayModeFilter sortByFreqAscending() { sortOrder.add(FREQ_ASCENDING) ; return this ; }
public DisplayModeFilter sortByWidthDescending() { sortOrder.add(WIDTH_DESCENDING) ; return this ; }
public DisplayModeFilter sortByHeightDescending() { sortOrder.add(HEIGHT_DESCENDING) ; return this ; }
public DisplayModeFilter sortByBppDescending() { sortOrder.add(BPP_DESCENDING) ; return this ; }
public DisplayModeFilter sortByFreqDescending() { sortOrder.add(FREQ_DESCENDING) ; return this ; }
// Filter method
public DisplayMode[] filter(final DisplayMode[] inModes)
{
final List filteredModes = new ArrayList(inModes.length) ;
for(int i = 0 ; i < inModes.length ; i++)
{
if(
(width == -1 || width == inModes[i].width) &&
(height == -1 || height == inModes[i].height) &&
(bpp == -1 || bpp == inModes[i].bpp) &&
(freq == -1 || freq == inModes[i].freq)
)
{
filteredModes.add(inModes[i]) ;
}
}
// Now sort filteredModes according to sort spec
final Iterator i = sortOrder.iterator() ;
while(i.hasNext())
{
final Comparator comparator = (Comparator)i.next() ;
Collections.sort(filteredModes, comparator) ;
}
// Convert to array, and return
DisplayMode[] outModes = (DisplayMode[])filteredModes.toArray(new DisplayMode[0]) ;
return outModes ;
}
}
Used like this:
DisplayModeFilter filter = new DisplayModeFilter();
filter.setWidth(1024).setHeight(768).setBpp(32);
filter.sortByFreqDescending();
DisplayMode[] modes = Display.getAvailableDisplayModes();
DisplayMode[] filtered = filter.filter(modes);
Rather overkill these days, but back when I first wrote it we were deciding things like alpha and depth buffers on display creation, as well!
Quote from: "lunarknight"You're code really helped me get started with LWJGL. You should submit it as a getting started code... or maybe make a few modifications and submit it to nehe tutorials!
Things your skeleton/base code taught me...
1)How to change resolution
2)How to go full screen
3)How to draw a polygon/triangle on the screen.
Thanks!~
LK
For some reason I am not getting notified when this thread is updated and I have chosen that option. Anyway, no problem. Glad my misunderstanding could help someone. :)
Quote from: "Fool Running"I realized after I posted it that the Window.update() doesn't have to be at the bottom :oops: (and I call myself a programmer :wink: )
anyways....
try changing
GL11.glTranslatef(Display.getWidth() / 2, Display.getHeight() / 2, 0.0f);
to
GL11.glTranslatef(Window.getWidth() / 2, Window.getHeight() / 2, 0.0f);
(I was trying this on version 0.8 so I had to play around with it, but I think that was the thing that made it work.... :roll: )
Yes, this seemed to do the trick. Thanks.