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* Copyright (c) 2002-2008 LWJGL Project
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* * Redistributions in binary form must reproduce the above copyright
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package org.lwjgl.test.opengl.pbuffers;
import java.nio.IntBuffer;
import org.lwjgl.BufferUtils;
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.*;
/**
* <p/>
* Tests Pbuffers
*
* @author elias_naur <elias_naur@users.sourceforge.net>
* @version $Revision$
* $Id$
*/
public final class PbufferTest {
/**
* Texture and pbuffer size
*/
private static final int TEXTURE_SIZE = 512;
/**
* Size of the animated quad
*/
private static final int QUAD_SIZE = 64;
/**
* The renderer to use when rendering to texture.
*/
private TextureRenderer texRenderer;
/**
* Intended deiplay mode
*/
private DisplayMode mode;
/**
* our quad moving around
*/
private Vector2f quadPosition;
/**
* For positioning our quad in the texture
*/
private float texScaleX, texScaleY;
/**
* 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;
/**
* The shared texture
*/
private static int texID;
public PbufferTest(final int renderMode) {
try {
//find displaymode
mode = findDisplayMode(800, 600, 16);
Display.setDisplayMode(mode);
Display.create(new PixelFormat(16, 0, 0, 0, 0));
glInit();
if ( (Pbuffer.getCapabilities() & Pbuffer.PBUFFER_SUPPORTED) == 0 ) {
System.out.println("No Pbuffer support!");
System.exit(-1);
}
System.out.println("Pbuffer support detected. Initializing...\n");
switch ( renderMode ) {
case 1:
System.out.print("Creating pbuffer with unique context...");
texRenderer = new UniqueRenderer(TEXTURE_SIZE, TEXTURE_SIZE, texID);
break;
case 2:
System.out.print("Creating render-to-texture pbuffer with unique context...");
texRenderer = new UniqueRendererRTT(TEXTURE_SIZE, TEXTURE_SIZE, texID);
break;
}
System.out.println("OK");
quadPosition = new Vector2f(100f, 100f);
quadVelocity = new Vector2f(1.0f, 1.0f);
texScaleX = TEXTURE_SIZE / (float)mode.getWidth();
texScaleY = TEXTURE_SIZE / (float)mode.getHeight();
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* Executes the test
*/
public void execute() {
mainLoop();
cleanup();
}
/**
* 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();
// Sync
Display.sync(100);
}
}
/**
* Performs the logic
*/
private void logic() {
angle += angleRotation;
if ( angle > 360.0f )
angle -= 360.0f;
quadPosition.x += quadVelocity.x;
quadPosition.y += quadVelocity.y;
// check colision with vertical border border
if ( quadPosition.x + QUAD_SIZE >= mode.getWidth() || quadPosition.x - QUAD_SIZE <= 0 )
quadVelocity.x *= -1;
// check collision with horizontal border
if ( quadPosition.y + QUAD_SIZE >= mode.getHeight() || quadPosition.y - QUAD_SIZE <= 0 )
quadVelocity.y *= -1;
}
private void render() {
// -----------------------------------------------------------
// -------------------- Pbuffer rendering --------------------
// -----------------------------------------------------------
// Tell the pbuffer to get ready for rendering
texRenderer.enable();
// Clear the background
glClear(GL_COLOR_BUFFER_BIT);
// Draw quad with gradient
glPushMatrix();
{
glTranslatef(quadPosition.x * texScaleX, quadPosition.y * texScaleY, 0);
glRotatef(angle, 0.0f, 0.0f, 1.0f);
glBegin(GL_QUADS);
{
glColor3f(1.0f, 0.0f, 0.0f);
glVertex2i(-QUAD_SIZE, -QUAD_SIZE);
glVertex2i(QUAD_SIZE, -QUAD_SIZE);
glColor3f(0.0f, 0.0f, 1.0f);
glVertex2i(QUAD_SIZE, QUAD_SIZE);
glVertex2i(-QUAD_SIZE, QUAD_SIZE);
}
glEnd();
}
glPopMatrix();
// Refresh the texture
texRenderer.updateTexture();
// -----------------------------------------------------------
// -------------------- Display rendering --------------------
// -----------------------------------------------------------
try {
Display.makeCurrent();
} catch (LWJGLException e) {
throw new RuntimeException(e);
}
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);
{
glTexCoord2f(0f, 0f);
glVertex2i(-QUAD_SIZE, -QUAD_SIZE);
glTexCoord2f(1f, 0f);
glVertex2i(QUAD_SIZE, -QUAD_SIZE);
glTexCoord2f(1f, 1f);
glVertex2i(QUAD_SIZE, QUAD_SIZE);
glTexCoord2f(0f, 1f);
glVertex2i(-QUAD_SIZE, QUAD_SIZE);
}
glEnd();
}
glPopMatrix();
}
/**
* 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;
}
/**
* Cleans up the test
*/
private void cleanup() {
// Destroy texture
IntBuffer buffer = BufferUtils.createIntBuffer(1);
buffer.put(0, texID);
glDeleteTextures(buffer);
texRenderer.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;
}
static void initGLState(int width, int height, float color) {
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluOrtho2D(0, width, 0, height);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glViewport(0, 0, width, height);
//set clear color
glClearColor(color, color, color, 0.0f);
}
/**
* Initializes OGL
*/
private void glInit() {
// Sync frame (only works on windows)
Display.setVSyncEnabled(true);
// Create shared texture
IntBuffer buffer = BufferUtils.createIntBuffer(1);
glGenTextures(buffer);
texID = buffer.get(0);
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, texID);
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(), 0.0f);
}
/**
* Test entry point
*/
public static void main(String[] args) {
if ( args.length != 1 )
kill("Invalid arguments length.");
int mode = -1;
try {
mode = Integer.parseInt(args[0]);
} catch (NumberFormatException e) {
kill("Invalid mode.");
}
if ( mode != 1 && mode != 2 )
kill("Invalid mode.");
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 test = new PbufferTest(mode);
test.execute();
System.exit(0);
}
private static void kill(final String msg) {
System.out.println(msg);
System.out.println("-------");
System.out.println("Usage: java org.lwjgl.test.opengl.pbuffer.PbufferTest <mode>");
System.out.println("\n<mode>.");
System.out.println("\t1: no render-to-texture");
System.out.println("\t2: with render-to-texture");
System.exit(-1);
}
}