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package demos.misc;
import com.sun.opengl.impl.io.FileUtil;
import com.sun.opengl.util.awt.ImageUtil;
import com.sun.opengl.util.gl2.TileRenderer;
import com.sun.opengl.util.io.TGAWriter;
import demos.gears.Gears;
import java.awt.image.BufferedImage;
import java.awt.image.DataBufferByte;
import java.io.File;
import java.io.IOException;
import java.nio.Buffer;
import java.nio.ByteBuffer;
import javax.imageio.ImageIO;
import javax.media.opengl.GL;
import javax.media.opengl.GL2;
import javax.media.opengl.GLCapabilities;
import javax.media.opengl.GLContext;
import javax.media.opengl.GLDrawableFactory;
import javax.media.opengl.GLPbuffer;
/** Demonstrates the TileRenderer class by rendering a large version
of the Gears demo to the specified file. */
public class TiledRendering {
public static void main(String[] args) throws IOException {
if (args.length != 1) {
System.out.println("Usage: java TiledRendering [output file name]");
System.out.println("Writes output (a large version of the Gears demo) to");
System.out.println("the specified file, using either ImageIO or the fast TGA writer");
System.out.println("depending on the file extension.");
System.exit(1);
}
String filename = args[0];
File file = new File(filename);
if (!GLDrawableFactory.getFactory().canCreateGLPbuffer()) {
System.out.println("Demo requires pbuffer support");
System.exit(1);
}
// Use a pbuffer for rendering
GLCapabilities caps = new GLCapabilities();
caps.setDoubleBuffered(false);
GLPbuffer pbuffer = GLDrawableFactory.getFactory().createGLPbuffer(caps, null,
256, 256,
null);
// Fix the image size for now
int tileWidth = 256;
int tileHeight = 256;
int imageWidth = tileWidth * 16;
int imageHeight = tileHeight * 12;
// Figure out the file format
TGAWriter tga = null;
BufferedImage img = null;
Buffer buf = null;
if (filename.endsWith(".tga")) {
tga = new TGAWriter();
tga.open(file,
imageWidth,
imageHeight,
false);
buf = tga.getImageData();
} else {
img = new BufferedImage(imageWidth, imageHeight, BufferedImage.TYPE_3BYTE_BGR);
buf = ByteBuffer.wrap(((DataBufferByte) img.getRaster().getDataBuffer()).getData());
}
// Initialize the tile rendering library
TileRenderer renderer = new TileRenderer();
renderer.setTileSize(tileWidth, tileHeight, 0);
renderer.setImageSize(imageWidth, imageHeight);
renderer.setImageBuffer(GL2.GL_BGR, GL.GL_UNSIGNED_BYTE, buf);
renderer.trPerspective(20.0f, (float) imageWidth / (float) imageHeight, 5.0f, 60.0f);
GLContext context = pbuffer.getContext();
if (context.makeCurrent() == GLContext.CONTEXT_NOT_CURRENT) {
System.out.println("Error making pbuffer's context current");
System.exit(1);
}
GL2 gl = pbuffer.getGL().getGL2();
gl.glMatrixMode(GL.GL_MODELVIEW);
gl.glLoadIdentity();
gl.glTranslatef(0.0f, 0.0f, -40.0f);
// Tile renderer will set up projection matrix
do {
renderer.beginTile(gl);
drawGears(gl);
} while (renderer.endTile(gl));
context.release();
// Close things up and/or write image using ImageIO
if (tga != null) {
tga.close();
} else {
ImageUtil.flipImageVertically(img);
if (!ImageIO.write(img, FileUtil.getFileSuffix(file), file)) {
System.err.println("Error writing file using ImageIO (unsupported file format?)");
}
}
}
private static void drawGears(GL2 gl) {
float view_rotx = 20.0f, view_roty = 30.0f, view_rotz = 0.0f;
float angle = 0.0f;
float pos[] = { 5.0f, 5.0f, 10.0f, 0.0f };
float red[] = { 0.8f, 0.1f, 0.0f, 1.0f };
float green[] = { 0.0f, 0.8f, 0.2f, 1.0f };
float blue[] = { 0.2f, 0.2f, 1.0f, 1.0f };
gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
gl.glLightfv(GL.GL_LIGHT0, GL.GL_POSITION, pos, 0);
gl.glEnable(GL.GL_CULL_FACE);
gl.glEnable(GL.GL_LIGHTING);
gl.glEnable(GL.GL_LIGHT0);
gl.glEnable(GL.GL_DEPTH_TEST);
gl.glEnable(GL.GL_NORMALIZE);
gl.glPushMatrix();
gl.glRotatef(view_rotx, 1.0f, 0.0f, 0.0f);
gl.glRotatef(view_roty, 0.0f, 1.0f, 0.0f);
gl.glRotatef(view_rotz, 0.0f, 0.0f, 1.0f);
gl.glPushMatrix();
gl.glTranslatef(-3.0f, -2.0f, 0.0f);
gl.glRotatef(angle, 0.0f, 0.0f, 1.0f);
gl.glMaterialfv(GL.GL_FRONT, GL.GL_AMBIENT_AND_DIFFUSE, red, 0);
Gears.gear(gl, 1.0f, 4.0f, 1.0f, 20, 0.7f);
gl.glPopMatrix();
gl.glPushMatrix();
gl.glTranslatef(3.1f, -2.0f, 0.0f);
gl.glRotatef(-2.0f * angle - 9.0f, 0.0f, 0.0f, 1.0f);
gl.glMaterialfv(GL.GL_FRONT, GL.GL_AMBIENT_AND_DIFFUSE, green, 0);
Gears.gear(gl, 0.5f, 2.0f, 2.0f, 10, 0.7f);
gl.glPopMatrix();
gl.glPushMatrix();
gl.glTranslatef(-3.1f, 4.2f, 0.0f);
gl.glRotatef(-2.0f * angle - 25.0f, 0.0f, 0.0f, 1.0f);
gl.glMaterialfv(GL.GL_FRONT, GL.GL_AMBIENT_AND_DIFFUSE, blue, 0);
Gears.gear(gl, 1.3f, 2.0f, 0.5f, 10, 0.7f);
gl.glPopMatrix();
gl.glPopMatrix();
}
}
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