diff options
Diffstat (limited to 'src/demos/xtrans/XTDesktopManager.java')
| -rwxr-xr-x | src/demos/xtrans/XTDesktopManager.java | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/src/demos/xtrans/XTDesktopManager.java b/src/demos/xtrans/XTDesktopManager.java new file mode 100755 index 0000000..3b8828a --- /dev/null +++ b/src/demos/xtrans/XTDesktopManager.java @@ -0,0 +1,164 @@ +package demos.xtrans; + +import java.awt.*; +import java.awt.geom.*; +import java.awt.image.*; +import java.beans.*; +import java.nio.*; +import java.util.*; +import javax.swing.*; +import javax.media.opengl.*; +import javax.media.opengl.glu.*; +import com.sun.opengl.impl.*; + +/** A desktop manager implementation supporting accelerated + transitions of the components on the desktop via OpenGL. This + class does not need to be instantiated by end users; it is + installed automatically when an XTDesktopPane is constructed. */ +public class XTDesktopManager extends OffscreenDesktopManager { + private GLContext j2dContext; + private Object j2dContextSurfaceIdentifier; + private int oglTextureId; + private int prevBackBufferWidth; + private int prevBackBufferHeight; + + private int textureTarget = GL.GL_TEXTURE_2D; + + /** Returns the OpenGL texture object ID associated with the + off-screen back buffer for all of the components on the + desktop. */ + public int getOpenGLTextureObject() { + return oglTextureId; + } + + /** Returns a rectangle specifying the OpenGL texture coordinates of + the passed component in the texture object. The x and y + coordinates of the returned rectangle specify the lower left + corner of the component's image. */ + public Rectangle2D getOpenGLTextureCoords(Component c) { + Rectangle rect = getBoundsOnBackBuffer(c); + if (rect == null) { + throw new RuntimeException("Unknown component " + c); + } + double offscreenWidth = getOffscreenBackBufferWidth(); + double offscreenHeight = getOffscreenBackBufferHeight(); + return new Rectangle2D.Double(rect.x / offscreenWidth, + (offscreenHeight - rect.y - rect.height) / offscreenHeight, + rect.width / offscreenWidth, + rect.height / offscreenHeight); + } + + /** Updates the off-screen buffer of this desktop manager and makes + the rendering results available to OpenGL in the form of a + texture object. */ + public void updateOffscreenBuffer(OffscreenDesktopPane parent) { + boolean needsCopy = needsCopyBack(); + boolean hadPrevBackBuffer = false; + super.updateOffscreenBuffer(parent); + Image img = getOffscreenBackBuffer(); + final boolean mustResizeOGLTexture = ((oglTextureId == 0) || + (img == null) || + (prevBackBufferWidth != img.getWidth(null)) || + (prevBackBufferHeight != img.getHeight(null))); + if (needsCopy) { + final Graphics g = getOffscreenGraphics(); + // Capture off-screen buffer contents into OpenGL texture + Java2D.invokeWithOGLContextCurrent(g, new Runnable() { + public void run() { + // Get valid Java2D context + if (j2dContext == null || + j2dContextSurfaceIdentifier != Java2D.getOGLSurfaceIdentifier(g)) { + j2dContext = GLDrawableFactory.getFactory().createExternalGLContext(); + j2dContext.setGL(new DebugGL(j2dContext.getGL())); + j2dContextSurfaceIdentifier = Java2D.getOGLSurfaceIdentifier(g); + } + + j2dContext.makeCurrent(); // No-op + try { + GL gl = j2dContext.getGL(); + + if (oglTextureId == 0) { + // Set up and initialize texture + int[] tmp = new int[1]; + + gl.glGenTextures(1, tmp, 0); + oglTextureId = tmp[0]; + if (oglTextureId == 0) { + throw new RuntimeException("Error generating OpenGL back buffer texture"); + } + assert mustResizeOGLTexture : "Must know we need to resize"; + } + + gl.glBindTexture(textureTarget, oglTextureId); + + int offscreenWidth = getOffscreenBackBufferWidth(); + int offscreenHeight = getOffscreenBackBufferHeight(); + + if (mustResizeOGLTexture) { + prevBackBufferWidth = offscreenWidth; + prevBackBufferHeight = offscreenHeight; + + gl.glTexImage2D(textureTarget, + 0, + GL.GL_RGBA8, + offscreenWidth, + offscreenHeight, + 0, + GL.GL_RGBA, + GL.GL_UNSIGNED_BYTE, + null); + } + + // Copy texture from offscreen buffer + // NOTE: assumes read buffer is set up + // FIXME: could be more efficient by copying only bounding rectangle + + gl.glPixelStorei(GL.GL_UNPACK_SWAP_BYTES, GL.GL_FALSE); + gl.glPixelStorei(GL.GL_PACK_SWAP_BYTES, GL.GL_FALSE); + gl.glPixelStorei(GL.GL_UNPACK_LSB_FIRST, GL.GL_FALSE); + gl.glPixelStorei(GL.GL_PACK_LSB_FIRST, GL.GL_FALSE); + gl.glPixelStorei(GL.GL_UNPACK_ROW_LENGTH, 0); + gl.glPixelStorei(GL.GL_PACK_ROW_LENGTH, 0); + gl.glPixelStorei(GL.GL_UNPACK_SKIP_ROWS, 0); + gl.glPixelStorei(GL.GL_PACK_SKIP_ROWS, 0); + gl.glPixelStorei(GL.GL_UNPACK_SKIP_PIXELS, 0); + gl.glPixelStorei(GL.GL_PACK_SKIP_PIXELS, 0); + gl.glPixelStorei(GL.GL_UNPACK_ALIGNMENT, 1); + gl.glPixelStorei(GL.GL_PACK_ALIGNMENT, 1); + gl.glPixelTransferf(GL.GL_RED_SCALE, 1); + gl.glPixelTransferf(GL.GL_GREEN_SCALE, 1); + gl.glPixelTransferf(GL.GL_BLUE_SCALE, 1); + gl.glPixelTransferf(GL.GL_ALPHA_SCALE, 1); + gl.glPixelTransferf(GL.GL_RED_BIAS, 0); + gl.glPixelTransferf(GL.GL_GREEN_BIAS, 0); + gl.glPixelTransferf(GL.GL_BLUE_BIAS, 0); + gl.glPixelTransferf(GL.GL_ALPHA_BIAS, 0); + + // long start = System.currentTimeMillis(); + gl.glCopyTexSubImage2D(textureTarget, + 0, + 0, + 0, + 0, + 0, + offscreenWidth, + offscreenHeight); + // long end = System.currentTimeMillis(); + // System.err.println("glCopyTexSubImage2D " + offscreenWidth + "x" + offscreenHeight + " took " + (end - start) + " ms"); + + } finally { + j2dContext.release(); + } + } + }); + } + } + + // Ideally we would force a repaint only of the 2D bounds of the 3D + // component projected onto the desktop. However for expedience + // we'll currently just repaint the entire desktop to get correct + // results. + protected void repaintPortionOfDesktop(JDesktopPane desktop, Component comp) { + desktop.repaint(); + } +} |