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package org.lwjgl.test.opengl;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.IntBuffer;
import org.lwjgl.LWJGLException;
import org.lwjgl.input.Keyboard;
import org.lwjgl.opengl.Display;
import org.lwjgl.opengl.DisplayMode;
import org.lwjgl.opengl.Pbuffer;
import org.lwjgl.opengl.PixelFormat;
import org.lwjgl.util.vector.Vector2f;
import static org.lwjgl.opengl.GL11.*;
import static org.lwjgl.util.glu.GLU.*;
/**
*
* Tests Pbuffers
*
* @author elias_naur <elias_naur@users.sourceforge.net>
* @version $Revision: 3418 $
* $Id: PbufferTest.java 3418 2010-09-28 21:11:35Z spasi $
*/
public class PbufferTest {
/** Intended deiplay mode */
private DisplayMode mode;
/** our quad moving around */
private Vector2f quadPosition;
/** our quadVelocity */
private Vector2f quadVelocity;
/** angle of quad */
private float angle;
/** degrees to rotate per frame */
private float angleRotation = 1.0f;
/** Max speed of all changable attributes */
private static final float MAX_SPEED = 20.0f;
/** Pbuffer instance */
private static Pbuffer pbuffer;
/** The shared texture */
private static int tex_handle;
/**
* Executes the test
*/
public void execute() {
initialize();
mainLoop();
cleanup();
}
/**
* Initializes the test
*/
private void initialize() {
try {
//find displaymode
pbuffer = new Pbuffer(512, 512, new PixelFormat(), null, null);
mode = findDisplayMode(800, 600, 16);
Display.setDisplayMode(mode);
// start of in windowed mode
Display.create();
// gl = new GLWindow("Test", 50, 50, mode.width, mode.height, mode.bpp, 0, 0, 0);
if ((Pbuffer.getCapabilities() & Pbuffer.PBUFFER_SUPPORTED) == 0) {
System.out.println("No Pbuffer support!");
System.exit(1);
}
System.out.println("Pbuffer support detected");
glInit();
initPbuffer();
Keyboard.create();
quadPosition = new Vector2f(100f, 100f);
quadVelocity = new Vector2f(1.0f, 1.0f);
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* Runs the main loop of the "test"
*/
private void mainLoop() {
while (!Keyboard.isKeyDown(Keyboard.KEY_ESCAPE) && !Display.isCloseRequested()) {
if (Display.isVisible()) {
// check keyboard input
processKeyboard();
// do "game" logic, and render it
logic();
render();
} else {
// no need to render/paint if nothing has changed (ie. window
// dragged over)
if (Display.isDirty()) {
render();
}
// don't waste cpu time, sleep more
try {
Thread.sleep(100);
} catch (InterruptedException inte) {
}
}
// Update window
Display.update();
}
}
/**
* Performs the logic
*/
private void logic() {
angle += angleRotation;
if (angle > 90.0f) {
angle = 0.0f;
}
quadPosition.x += quadVelocity.x;
quadPosition.y += quadVelocity.y;
//check colision with vertical border border
if (quadPosition.x + 50 >= mode.getWidth() || quadPosition.x - 50 <= 0) {
quadVelocity.x *= -1;
}
//check collision with horizontal border
if (quadPosition.y + 50 >= mode.getHeight() || quadPosition.y - 50 <= 0) {
quadVelocity.y *= -1;
}
}
private void render() {
if (pbuffer.isBufferLost()) {
System.out.println("Buffer contents lost - will recreate the buffer");
pbuffer.destroy();
try {
pbuffer = new Pbuffer(512, 512, new PixelFormat(), null, null);
initPbuffer();
} catch (LWJGLException e) {
e.printStackTrace();
}
}
try {
pbuffer.makeCurrent();
} catch (LWJGLException e) {
throw new RuntimeException(e);
}
// Pbuffer rendering
//clear background
glClear(GL_COLOR_BUFFER_BIT);
// draw white quad
glPushMatrix();
{
glTranslatef(quadPosition.x, quadPosition.y, 0);
glRotatef(angle, 0.0f, 0.0f, 1.0f);
glColor3f(1.0f, 1.0f, 1.0f);
glBegin(GL_QUADS);
{
glVertex2i(-50, -50);
glVertex2i(50, -50);
glVertex2i(50, 50);
glVertex2i(-50, 50);
}
glEnd();
}
glPopMatrix();
glCopyTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 0, 0, 512, 512, 0);
try {
Display.makeCurrent();
} catch (LWJGLException e) {
throw new RuntimeException(e);
}
// OpenGL window rendering
glClear(GL_COLOR_BUFFER_BIT);
// draw white quad
glPushMatrix();
{
glTranslatef(quadPosition.x, quadPosition.y, 0);
glRotatef(angle, 0.0f, 0.0f, 1.0f);
glColor3f(1.0f, 1.0f, 0.0f);
glBegin(GL_QUADS);
{
glTexCoord2f(0f, 0f);
glVertex2i(-50, -50);
glTexCoord2f(1f, 0f);
glVertex2i(50, -50);
glTexCoord2f(1f, 1f);
glVertex2i(50, 50);
glTexCoord2f(0f, 1f);
glVertex2i(-50, 50);
}
glEnd();
}
glPopMatrix();
}
private void initPbuffer() {
try {
pbuffer.makeCurrent();
initGLState(256, 256, 0.5f);
glBindTexture(GL_TEXTURE_2D, tex_handle);
Display.makeCurrent();
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* Processes keyboard input
*/
private void processKeyboard() {
Keyboard.poll();
//check for fullscreen key
if (Keyboard.isKeyDown(Keyboard.KEY_F)) {
try {
Display.setDisplayMode(mode);
Display.setFullscreen(true);
} catch (Exception e) {
e.printStackTrace();
}
}
//check for window key
if (Keyboard.isKeyDown(Keyboard.KEY_W)) {
try {
Display.setFullscreen(false);
} catch (Exception e) {
e.printStackTrace();
}
}
//check for speed changes
if (Keyboard.isKeyDown(Keyboard.KEY_UP)) {
quadVelocity.y += 0.1f;
}
if (Keyboard.isKeyDown(Keyboard.KEY_DOWN)) {
quadVelocity.y -= 0.1f;
}
if (Keyboard.isKeyDown(Keyboard.KEY_RIGHT)) {
quadVelocity.x += 0.1f;
}
if (Keyboard.isKeyDown(Keyboard.KEY_LEFT)) {
quadVelocity.x -= 0.1f;
}
if (Keyboard.isKeyDown(Keyboard.KEY_ADD)) {
angleRotation += 0.1f;
}
if (Keyboard.isKeyDown(Keyboard.KEY_SUBTRACT)) {
angleRotation -= 0.1f;
}
//throttle
if (quadVelocity.x < -MAX_SPEED) {
quadVelocity.x = -MAX_SPEED;
}
if (quadVelocity.x > MAX_SPEED) {
quadVelocity.x = MAX_SPEED;
}
if (quadVelocity.y < -MAX_SPEED) {
quadVelocity.y = -MAX_SPEED;
}
if (quadVelocity.y > MAX_SPEED) {
quadVelocity.y = MAX_SPEED;
}
if (angleRotation < 0.0f) {
angleRotation = 0.0f;
}
if (angleRotation > MAX_SPEED) {
angleRotation = MAX_SPEED;
}
}
private void destroyTexture() {
IntBuffer buffer = ByteBuffer.allocateDirect(4).order(ByteOrder.nativeOrder()).asIntBuffer();
buffer.put(0, tex_handle);
glDeleteTextures(buffer);
}
/**
* Cleans up the test
*/
private void cleanup() {
destroyTexture();
pbuffer.destroy();
Display.destroy();
}
/**
* Retrieves a displaymode, if one such is available
*
* @param width Required width
* @param height Required height
* @param bpp Minimum required bits per pixel
* @return
*/
private DisplayMode findDisplayMode(int width, int height, int bpp) throws LWJGLException {
DisplayMode[] modes = Display.getAvailableDisplayModes();
for ( DisplayMode mode : modes ) {
if ( mode.getWidth() == width && mode.getHeight() == height && mode.getBitsPerPixel() >= bpp )
return mode;
}
return null;
}
private void initGLState(int width, int height, float color) {
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluOrtho2D(0, mode.getWidth(), 0, mode.getHeight());
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glViewport(0, 0, width, height);
//set clear color to black
glClearColor(color, color, color, 0.0f);
}
/**
* Initializes OGL
*/
private void glInit() {
//sync frame (only works on windows)
Display.setVSyncEnabled(true);
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
glEnable(GL_TEXTURE_2D);
// Create shared texture
IntBuffer buffer = ByteBuffer.allocateDirect(4).order(ByteOrder.nativeOrder()).asIntBuffer();
glGenTextures(buffer);
tex_handle = buffer.get(0);
glBindTexture(GL_TEXTURE_2D, tex_handle);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
initGLState(mode.getWidth(), mode.getHeight(), 0f);
}
/**
* Test entry point
*/
public static void main(String[] args) {
System.out.println(
"Change between fullscreen and windowed mode, by pressing F and W respectively");
System.out.println("Move quad using arrowkeys, and change rotation using +/-");
PbufferTest fswTest = new PbufferTest();
fswTest.execute();
System.exit(0);
}
}