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+/*
+ * Copyright (c) 2007 Sun Microsystems, Inc. All Rights Reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * - Redistribution of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistribution in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * Neither the name of Sun Microsystems, Inc. or the names of
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * This software is provided "AS IS," without a warranty of any kind. ALL
+ * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
+ * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
+ * PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
+ * MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR
+ * ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR
+ * DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
+ * DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
+ * ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
+ * SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
+ *
+ * You acknowledge that this software is not designed or intended for use
+ * in the design, construction, operation or maintenance of any nuclear
+ * facility.
+ *
+ * Sun gratefully acknowledges that this software was originally authored
+ * and developed by Kenneth Bradley Russell and Christopher John Kline.
+ */
+
+package demos.util;
+
+import java.awt.Font;
+import java.awt.geom.*;
+import java.text.*;
+
+import javax.media.opengl.*;
+import com.sun.opengl.util.j2d.*;
+
+/** A simple class which uses the TextRenderer to provide an FPS
+ counter overlaid on top of the scene. */
+
+public class FPSCounter {
+ // Placement constants
+ public static final int UPPER_LEFT = 1;
+ public static final int UPPER_RIGHT = 2;
+ public static final int LOWER_LEFT = 3;
+ public static final int LOWER_RIGHT = 4;
+
+ private int textLocation = LOWER_RIGHT;
+ private GLDrawable drawable;
+ private TextRenderer renderer;
+ private DecimalFormat format = new DecimalFormat("####.00");
+ private int frameCount;
+ private long startTime;
+ private String fpsText;
+ private int fpsMagnitude;
+ private int fpsWidth;
+ private int fpsHeight;
+ private int fpsOffset;
+
+ /** Creates a new FPSCounter with the given font size. An OpenGL
+ context must be current at the time the constructor is called.
+
+ @param drawable the drawable to render the text to
+ @param textSize the point size of the font to use
+ @throws GLException if an OpenGL context is not current when the constructor is called
+ */
+ public FPSCounter(GLDrawable drawable, int textSize) throws GLException {
+ this(drawable, new Font("SansSerif", Font.BOLD, textSize));
+ }
+
+ /** Creates a new FPSCounter with the given font. An OpenGL context
+ must be current at the time the constructor is called.
+
+ @param drawable the drawable to render the text to
+ @param font the font to use
+ @throws GLException if an OpenGL context is not current when the constructor is called
+ */
+ public FPSCounter(GLDrawable drawable, Font font) throws GLException {
+ this(drawable, font, true, true);
+ }
+
+ /** Creates a new FPSCounter with the given font and rendering
+ attributes. An OpenGL context must be current at the time the
+ constructor is called.
+
+ @param drawable the drawable to render the text to
+ @param font the font to use
+ @param antialiased whether to use antialiased fonts
+ @param useFractionalMetrics whether to use fractional font
+ @throws GLException if an OpenGL context is not current when the constructor is called
+ */
+ public FPSCounter(GLDrawable drawable,
+ Font font,
+ boolean antialiased,
+ boolean useFractionalMetrics) throws GLException {
+ this.drawable = drawable;
+ renderer = new TextRenderer(font, antialiased, useFractionalMetrics);
+ }
+
+ /** Gets the relative location where the text of this FPSCounter
+ will be drawn: one of UPPER_LEFT, UPPER_RIGHT, LOWER_LEFT, or
+ LOWER_RIGHT. Defaults to LOWER_RIGHT. */
+ public int getTextLocation() {
+ return textLocation;
+ }
+
+ /** Sets the relative location where the text of this FPSCounter
+ will be drawn: one of UPPER_LEFT, UPPER_RIGHT, LOWER_LEFT, or
+ LOWER_RIGHT. Defaults to LOWER_RIGHT. */
+ public void setTextLocation(int textLocation) {
+ if (textLocation < UPPER_LEFT || textLocation > LOWER_RIGHT) {
+ throw new IllegalArgumentException("textLocation");
+ }
+ this.textLocation = textLocation;
+ }
+
+ /** Changes the current color of this TextRenderer to the supplied
+ one, where each component ranges from 0.0f - 1.0f. The alpha
+ component, if used, does not need to be premultiplied into the
+ color channels as described in the documentation for {@link
+ Texture Texture}, although premultiplied colors are used
+ internally. The default color is opaque white.
+
+ @param r the red component of the new color
+ @param g the green component of the new color
+ @param b the blue component of the new color
+ @param alpha the alpha component of the new color, 0.0f =
+ completely transparent, 1.0f = completely opaque
+ @throws GLException If an OpenGL context is not current when this method is called
+ */
+ public void setColor(float r, float g, float b, float a) throws GLException {
+ renderer.setColor(r, g, b, a);
+ }
+
+ /** Updates the FPSCounter's internal timer and counter and draws
+ the computed FPS. It is assumed this method will be called only
+ once per frame.
+ */
+ public void draw() {
+ if (startTime == 0) {
+ startTime = System.currentTimeMillis();
+ }
+
+ if (++frameCount >= 100) {
+ long endTime = System.currentTimeMillis();
+ float fps = 100.0f / (float) (endTime - startTime) * 1000;
+ recomputeFPSSize(fps);
+ frameCount = 0;
+ startTime = System.currentTimeMillis();
+
+ fpsText = "FPS: " + format.format(fps);
+ }
+
+ if (fpsText != null) {
+ renderer.beginRendering(drawable.getWidth(), drawable.getHeight());
+ // Figure out the location at which to draw the text
+ int x = 0;
+ int y = 0;
+ switch (textLocation) {
+ case UPPER_LEFT:
+ x = fpsOffset;
+ y = drawable.getHeight() - fpsHeight - fpsOffset;
+ break;
+
+ case UPPER_RIGHT:
+ x = drawable.getWidth() - fpsWidth - fpsOffset;
+ y = drawable.getHeight() - fpsHeight - fpsOffset;
+ break;
+
+ case LOWER_LEFT:
+ x = fpsOffset;
+ y = fpsOffset;
+ break;
+
+ case LOWER_RIGHT:
+ x = drawable.getWidth() - fpsWidth - fpsOffset;
+ y = fpsOffset;
+ break;
+ }
+
+ renderer.draw(fpsText, x, y);
+ renderer.endRendering();
+ }
+ }
+
+ private void recomputeFPSSize(float fps) {
+ String fpsText;
+ int fpsMagnitude;
+ if (fps >= 10000) {
+ fpsText = "10000.00";
+ fpsMagnitude = 5;
+ } else if (fps >= 1000) {
+ fpsText = "1000.00";
+ fpsMagnitude = 4;
+ } else if (fps >= 100) {
+ fpsText = "100.00";
+ fpsMagnitude = 3;
+ } else if (fps >= 10) {
+ fpsText = "10.00";
+ fpsMagnitude = 2;
+ } else {
+ fpsText = "9.00";
+ fpsMagnitude = 1;
+ }
+
+ if (fpsMagnitude > this.fpsMagnitude) {
+ Rectangle2D bounds = renderer.getBounds("FPS: " + fpsText);
+ fpsWidth = (int) bounds.getWidth();
+ fpsHeight = (int) bounds.getHeight();
+ fpsOffset = (int) (fpsHeight * 0.5f);
+ this.fpsMagnitude = fpsMagnitude;
+ }
+ }
+}