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/*******************************************************************************
* Copyright (c) 2000, 2003 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.swt.opengl.examples;
import org.eclipse.opengl.*;
import org.eclipse.swt.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;
class FogTab extends OpenGLTab {
private float rotY = 0.0f;
private float yPos = 0.0f, xPos = 0.0f, zPos = -15.0f;
private int cubeListIndexBase;
private final static int[] FOG_TYPES = { GL.GL_LINEAR, GL.GL_EXP, GL.GL_EXP2 };
private final static String[] FOG_NAMES = { "LINEAR", "GL_EXP", "GL_EXP2" };
private final static int SLEEP_LENGTH = 0;
/**
* @see OpenGLTab#createControls(Composite)
*/
void createControls(Composite composite) {
Group movementGroup = new Group(composite, SWT.NONE);
movementGroup.setText("Translation");
movementGroup.setLayout(new GridLayout(2, false));
new Label(movementGroup, SWT.NONE).setText("X:");
final Slider xMove = new Slider(movementGroup, SWT.NONE);
xMove.setIncrement(1);
xMove.setMaximum(12);
xMove.setMinimum(0);
xMove.setThumb(2);
xMove.setPageIncrement(2);
xMove.setSelection(5);
xMove.addListener(SWT.Selection, new Listener() {
public void handleEvent(Event e) {
xPos = xMove.getSelection() - 5;
}
});
new Label(movementGroup, SWT.NONE).setText("Y:");
final Slider yMove = new Slider(movementGroup, SWT.NONE);
yMove.setIncrement(1);
yMove.setMaximum(12);
yMove.setMinimum(0);
yMove.setThumb(2);
yMove.setPageIncrement(2);
yMove.setSelection(5);
yMove.addListener(SWT.Selection, new Listener() {
public void handleEvent(Event e) {
yPos = yMove.getSelection() - 5;
}
});
new Label(movementGroup, SWT.NONE).setText("Z:");
final Slider zMove = new Slider(movementGroup, SWT.NONE);
zMove.setIncrement(1);
zMove.setMaximum(24);
zMove.setMinimum(0);
zMove.setThumb(4);
zMove.setPageIncrement(2);
zMove.setSelection(10);
zMove.addListener(SWT.Selection, new Listener() {
public void handleEvent(Event e) {
zPos = zMove.getSelection() - 25;
}
});
Composite fogTypesGroup = new Composite(composite,SWT.NONE);
GridLayout layout = new GridLayout(2,false);
layout.marginHeight = 0;
layout.marginWidth = 0;
fogTypesGroup.setLayout(layout);
fogTypesGroup.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_FILL));
new Label(fogTypesGroup, SWT.NONE).setText("Fog Types:");
final Combo fogTypeCombo = new Combo(fogTypesGroup, SWT.READ_ONLY);
GridData data = new GridData(GridData.HORIZONTAL_ALIGN_FILL);
data.grabExcessHorizontalSpace = true;
fogTypeCombo.setLayoutData(data);
fogTypeCombo.setItems(FOG_NAMES);
fogTypeCombo.select(0);
new Label(composite, SWT.NONE).setText("Fog Density:");
final Slider fogDensitySlider = new Slider(composite, SWT.NONE);
fogDensitySlider.setIncrement(1);
fogDensitySlider.setMaximum(32);
fogDensitySlider.setMinimum(0);
fogDensitySlider.setThumb(2);
fogDensitySlider.setPageIncrement(5);
fogDensitySlider.setSelection(0);
fogDensitySlider.setEnabled(false);
fogDensitySlider.addListener(SWT.Selection, new Listener() {
public void handleEvent(Event e) {
float fogDensity = ((float)fogDensitySlider.getSelection()) / 100;
GL.glFogf(GL.GL_FOG_DENSITY, fogDensity);
}
});
fogTypeCombo.addListener(SWT.Selection, new Listener() {
public void handleEvent(Event e) {
int currentSelection = fogTypeCombo.getSelectionIndex();
// fog type GL.GL_LINEAR does not utilize fogDensity, but the other fog types do
fogDensitySlider.setEnabled(currentSelection != 0);
GL.glFogf(GL.GL_FOG_MODE, FOG_TYPES[currentSelection]);
}
});
}
/**
* Creates a cube at 0,0 in the viewport.
*/
void createCube() {
GL.glNewList(cubeListIndexBase, GL.GL_COMPILE);
GL.glBegin(GL.GL_QUADS);
// front
GL.glColor3f(0.0f, 1.0f, 0.0f);
GL.glVertex3f(-0.5f, -0.5f, 0.5f); // bottom left
GL.glColor3f(0.0f, 0.0f, 1.0f);
GL.glVertex3f(0.5f, -0.5f, 0.5f); // bottom right
GL.glColor3f(1.0f, 1.0f, 0.0f);
GL.glVertex3f(0.5f, 0.5f, 0.5f); // top right
GL.glColor3f(1.0f, 0.0f, 0.0f);
GL.glVertex3f(-0.5f, 0.5f, 0.5f); // top left
// back
GL.glColor3f(0.0f, 0.0f, 1.0f);
GL.glVertex3f(-0.5f, -0.5f, -0.5f); // bottom left
GL.glColor3f(0.0f, 1.0f, 0.0f);
GL.glVertex3f(0.5f, -0.5f, -0.5f); // bottom right
GL.glColor3f(1.0f, 0.0f, 0.0f);
GL.glVertex3f(0.5f, 0.5f, -0.5f); // top right
GL.glColor3f(1.0f, 1.0f, 0.0f);
GL.glVertex3f(-0.5f, 0.5f, -0.5f); // top left
// left
GL.glColor3f(0.0f, 0.0f, 1.0f);
GL.glVertex3f(-0.5f, -0.5f, -0.5f); // bottom left
GL.glColor3f(0.0f, 1.0f, 0.0f);
GL.glVertex3f(-0.5f, -0.5f, 0.5f); // bottom right
GL.glColor3f(1.0f, 0.0f, 0.0f);
GL.glVertex3f(-0.5f, 0.5f, 0.5f); // top right
GL.glColor3f(1.0f, 1.0f, 0.0f);
GL.glVertex3f(-0.5f, 0.5f, -0.5f); // top left
// right
GL.glColor3f(0.0f, 0.0f, 1.0f);
GL.glVertex3f(0.5f, -0.5f, 0.5f); // bottom left
GL.glColor3f(0.0f, 1.0f, 0.0f);
GL.glVertex3f(0.5f, -0.5f, -0.5f); // bottom right
GL.glColor3f(1.0f, 0.0f, 0.0f);
GL.glVertex3f(0.5f, 0.5f, -0.5f); // top right
GL.glColor3f(1.0f, 1.0f, 0.0f);
GL.glVertex3f(0.5f, 0.5f, 0.5f); // top left
// top
GL.glColor3f(1.0f, 0.0f, 0.0f);
GL.glVertex3f(0.5f, 0.5f, -0.5f);
GL.glColor3f(1.0f, 1.0f, 0.0f);
GL.glVertex3f(-0.5f, 0.5f, -0.5f);
GL.glColor3f(1.0f, 0.0f, 0.0f);
GL.glVertex3f(-0.5f, 0.5f, 0.5f);
GL.glColor3f(1.0f, 1.0f, 0.0f);
GL.glVertex3f(0.5f, 0.5f, 0.5f);
// bottom
GL.glColor3f(0.0f, 0.0f, 1.0f);
GL.glVertex3f(0.5f, -0.5f, 0.5f);
GL.glColor3f(0.0f, 1.0f, 0.0f);
GL.glVertex3f(-0.5f, -0.5f, 0.5f);
GL.glColor3f(0.0f, 0.0f, 1.0f);
GL.glVertex3f(-0.5f, -0.5f, -0.5f);
GL.glColor3f(0.0f, 1.0f, 0.0f);
GL.glVertex3f(0.5f, -0.5f, -0.5f);
GL.glEnd();
GL.glEndList();
}
/**
* @see OpenGLTab#dispose()
*/
void dispose() {
super.dispose();
GL.glDeleteLists(cubeListIndexBase, 1);
}
/**
* @see OpenGLTab#getSleepLength()
*/
int getSleepLength() {
return SLEEP_LENGTH;
}
/**
* @see OpenGLTab#getTabText()
*/
String getTabText() {
return "Fog";
}
/**
* @see OpenGLTab#init()
*/
void init() {
GL.glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
// fog color should be the same as the clear color
// to look appropriate
float[] fogColor = { 1.0f, 1.0f, 1.0f, 1.0f };
GL.glFogfv(GL.GL_FOG_COLOR, fogColor);
GL.glHint(GL.GL_FOG_HINT, GL.GL_DONT_CARE);
GL.glFogf(GL.GL_FOG_START, 0);
GL.glFogf(GL.GL_FOG_DENSITY, 0.0f);
// set the end of the start distance; anything > 15
// units from the camera will be covered in fog
GL.glFogf(GL.GL_FOG_END, 15);
GL.glFogf(GL.GL_FOG_MODE, FOG_TYPES[0]);
GL.glEnable(GL.GL_FOG);
GL.glEnable(GL.GL_DEPTH_TEST);
cubeListIndexBase = GL.glGenLists(1);
createCube();
}
/**
* @see OpenGLTab#renderScene()
*/
void renderScene() {
GL.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
GL.glLoadIdentity();
GL.glTranslatef(xPos, yPos, zPos);
GL.glRotatef(rotY, 0.0f, 1.0f, 0.0f);
GL.glCallList(cubeListIndexBase);
GL.glPushMatrix();
GL.glTranslatef(3, 0, -3);
GL.glCallList(cubeListIndexBase);
GL.glPopMatrix();
GL.glPushMatrix();
GL.glTranslatef(-3, 0, -3);
GL.glCallList(cubeListIndexBase);
GL.glPopMatrix();
GL.glPushMatrix();
GL.glTranslatef(0, 0, 4);
GL.glCallList(cubeListIndexBase);
GL.glPopMatrix();
rotY += 0.6f;
}
}
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