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Diffstat (limited to 'src/classes/com/sun/opengl/util/J2DTextureRenderer.java')
| -rwxr-xr-x | src/classes/com/sun/opengl/util/J2DTextureRenderer.java | 346 |
1 files changed, 346 insertions, 0 deletions
diff --git a/src/classes/com/sun/opengl/util/J2DTextureRenderer.java b/src/classes/com/sun/opengl/util/J2DTextureRenderer.java new file mode 100755 index 000000000..940af43c9 --- /dev/null +++ b/src/classes/com/sun/opengl/util/J2DTextureRenderer.java @@ -0,0 +1,346 @@ +/* + * Copyright (c) 2006 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 com.sun.opengl.util; + +import java.awt.Dimension; +import java.awt.Graphics2D; +import java.awt.image.*; + +import javax.media.opengl.*; +import javax.media.opengl.glu.*; +import com.sun.opengl.util.texture.*; + +/** Provides the ability to render into an OpenGL {@link + com.sun.opengl.util.texture.Texture Texture} using the Java 2D + APIs. This renderer class uses an internal Java 2D image (of + unspecified type) for its backing store and flushes portions of + that image to an OpenGL texture on demand. The resulting OpenGL + texture can then be mapped on to a polygon for display. */ + +public class J2DTextureRenderer { + // For now, we supply only a BufferedImage back-end for this + // renderer. In theory we could use the Java 2D/JOGL bridge to fully + // accelerate the rendering paths, but there are restrictions on + // what work can be done where; for example, Graphics2D-related work + // must not be done on the Queue Flusher Thread, but JOGL's + // OpenGL-related work must be. This implies that the user's code + // would need to be split up into multiple callbacks run from the + // appropriate threads, which would be somewhat unfortunate. + private boolean alpha; + private BufferedImage image; + + private Texture texture; + private TextureData textureData; + private boolean mustReallocateTexture; + + private GLU glu = new GLU(); + + /** Creates a new renderer with backing store of the specified width + and height. If alpha is true, allocates an alpha channel in the + backing store image. + + @param width the width of the texture to render into + @param height the height of the texture to render into + @param alpha whether to allocate an alpha channel for the texture + */ + public J2DTextureRenderer(int width, int height, boolean alpha) { + this.alpha = alpha; + init(width, height); + } + + /** Returns the width of the backing store of this renderer. + + @return the width of the backing store of this renderer + */ + public int getWidth() { + return image.getWidth(); + } + + /** Returns the height of the backing store of this renderer. + + @return the height of the backing store of this renderer + */ + public int getHeight() { + return image.getHeight(); + } + + /** Returns the size of the backing store of this renderer in a + newly-allocated {@link java.awt.Dimension Dimension} object. + + @return the size of the backing store of this renderer + */ + public Dimension getSize() { + return getSize(null); + } + + /** Returns the size of the backing store of this renderer. Uses the + {@link java.awt.Dimension Dimension} object if one is supplied, + or allocates a new one if null is passed. + + @param d a {@link java.awt.Dimension Dimension} object in which + to store the results, or null to allocate a new one + + @return the size of the backing store of this renderer + */ + public Dimension getSize(Dimension d) { + if (d == null) + d = new Dimension(); + d.setSize(image.getWidth(), image.getHeight()); + return d; + } + + /** Sets the size of the backing store of this renderer. This may + cause the OpenGL texture object associated with this renderer to + be invalidated; it is not recommended to cache this texture + object outside this class but to instead call {@link #getTexture + getTexture} when it is needed. + + @param width the new width of the backing store of this renderer + @param height the new height of the backing store of this renderer + */ + public void setSize(int width, int height) { + init(width, height); + } + + + /** Sets the size of the backing store of this renderer. This may + cause the OpenGL texture object associated with this renderer to + be invalidated. + + @param d the new size of the backing store of this renderer + */ + public void setSize(Dimension d) { + setSize(d.width, d.height); + } + + /** Creates a {@link java.awt.Graphics2D Graphics2D} instance for + rendering to the backing store of this renderer. The returned + object should be disposed of using the normal {@link + java.awt.Graphics#dispose() Graphics.dispose()} method once it + is no longer being used. + + @return a new {@link java.awt.Graphics2D Graphics2D} object for + rendering into the backing store of this renderer + */ + public Graphics2D createGraphics() { + return image.createGraphics(); + } + + /** Synchronizes the specified region of the backing store down to + the underlying OpenGL texture. + + @param x the x coordinate (in Java 2D coordinates -- relative to + upper left) of the region to update + @param y the y coordinate (in Java 2D coordinates -- relative to + upper left) of the region to update + @param width the width of the region to update + @param height the height of the region to update + + @throws GLException If an OpenGL context is not current when this method is called + */ + public void sync(int x, int y, int width, int height) throws GLException { + // Force allocation if necessary + boolean canSkipUpdate = ensureTexture(); + + if (!canSkipUpdate) { + // Update specified region + texture.updateSubImage(textureData, 0, x, y, x, y, width, height); + } + } + + /** Returns the underlying OpenGL Texture object associated with + this renderer. + + @throws GLException If an OpenGL context is not current when this method is called + */ + public Texture getTexture() throws GLException { + ensureTexture(); + return texture; + } + + /** Disposes all resources associated with this renderer. It is not + valid to use this renderer after calling this method. + + @throws GLException If an OpenGL context is not current when this method is called + */ + public void dispose() throws GLException { + if (texture != null) { + texture.dispose(); + texture = null; + } + if (image != null) { + image.flush(); + image = null; + } + } + + /** Convenience method which assists in rendering portions of the + OpenGL texture to the screen, if the application intends to draw + them as a flat overlay on to the screen. Sets up the viewing + matrices, for orthographic rendering where the coordinates go + from (0, 0) at the lower left to (width, height) at the upper + right; disables the depth test and lighting; and enables the + texture in this renderer. {@link #endOrthoRendering} must be + used in conjunction with this method to restore all OpenGL + states. + + @param width the width of the current on-screen OpenGL drawable + @param height the height of the current on-screen OpenGL drawable + + @throws GLException If an OpenGL context is not current when this method is called + */ + public void beginOrthoRendering(int width, int height) throws GLException { + GL gl = GLU.getCurrentGL(); + gl.glPushAttrib(GL.GL_ENABLE_BIT | GL.GL_DEPTH_BUFFER_BIT | GL.GL_TRANSFORM_BIT); + gl.glDisable(GL.GL_DEPTH_TEST); + gl.glDisable(GL.GL_CULL_FACE); + gl.glDisable(GL.GL_LIGHTING); + gl.glMatrixMode(GL.GL_PROJECTION); + gl.glPushMatrix(); + gl.glLoadIdentity(); + glu.gluOrtho2D(0, width, 0, height); + gl.glMatrixMode(GL.GL_MODELVIEW); + gl.glPushMatrix(); + gl.glLoadIdentity(); + gl.glEnable(GL.GL_BLEND); + gl.glBlendFunc(GL.GL_ONE, GL.GL_ONE_MINUS_SRC_ALPHA); + Texture texture = getTexture(); + texture.enable(); + texture.bind(); + gl.glTexEnvi(GL.GL_TEXTURE_ENV, GL.GL_TEXTURE_ENV_MODE, GL.GL_REPLACE); + } + + /** Draws an orthographically projected rectangle of the underlying + texture to the specified location on the screen. All (x, y) + coordinates are specified relative to the lower left corner of + either the texture image or the current OpenGL drawable. + + @param screenx the on-screen x coordinate at which to draw the rectangle + @param screeny the on-screen y coordinate (relative to lower left) at + which to draw the rectangle + @param texturex the x coordinate of the pixel in the texture of + the lower left portion of the rectangle to draw + @param texturey the y coordinate of the pixel in the texture + (relative to lower left) of the lower left portion of the + rectangle to draw + @param width the width of the rectangle to draw + @param height the height of the rectangle to draw + + @throws GLException If an OpenGL context is not current when this method is called + */ + public void drawOrthoRect(int screenx, int screeny, + int texturex, int texturey, + int width, int height) throws GLException { + GL gl = GLU.getCurrentGL(); + Texture texture = getTexture(); + TextureCoords coords = texture.getSubImageTexCoords(texturex, texturey, + texturex + width, + texturey + height); + gl.glBegin(GL.GL_QUADS); + gl.glTexCoord2f(coords.left(), coords.bottom()); + gl.glVertex3f(screenx, screeny, 0); + gl.glTexCoord2f(coords.right(), coords.bottom()); + gl.glVertex3f(screenx + width, screeny, 0); + gl.glTexCoord2f(coords.right(), coords.top()); + gl.glVertex3f(screenx + width, screeny + height, 0); + gl.glTexCoord2f(coords.left(), coords.top()); + gl.glVertex3f(screenx, screeny + height, 0); + gl.glEnd(); + } + + /** Convenience method which assists in rendering portions of the + OpenGL texture to the screen, if the application intends to draw + them as a flat overlay on to the screen. Must be used if {@link + #beginOrthoRendering} is used to set up the rendering stage for + this overlay. + + @throws GLException If an OpenGL context is not current when this method is called + */ + public void endOrthoRendering() throws GLException { + GL gl = GLU.getCurrentGL(); + Texture texture = getTexture(); + texture.disable(); + gl.glMatrixMode(GL.GL_PROJECTION); + gl.glPopMatrix(); + gl.glMatrixMode(GL.GL_MODELVIEW); + gl.glPopMatrix(); + gl.glPopAttrib(); + } + + //---------------------------------------------------------------------- + // Internals only below this point + // + + private void init(int width, int height) { + // Discard previous BufferedImage if any + if (image != null) { + image.flush(); + image = null; + } + + int imageType = (alpha ? BufferedImage.TYPE_INT_ARGB_PRE : BufferedImage.TYPE_INT_RGB); + image = new BufferedImage(width, height, imageType); + // Always realllocate the TextureData associated with this + // BufferedImage; it's just a reference to the contents but we + // need it in order to update sub-regions of the underlying + // texture + textureData = TextureIO.newTextureData(image, false); + // For now, always reallocate the underlying OpenGL texture when + // the backing store size changes + mustReallocateTexture = true; + } + + // Returns true if the texture was newly allocated, false if not + private boolean ensureTexture() { + if (mustReallocateTexture) { + if (texture != null) { + texture.dispose(); + texture = null; + } + } + + if (texture == null) { + texture = TextureIO.newTexture(textureData); + return true; + } + + return false; + } +} |