bundles/org.eclipse.swt.opengl/motif/org/eclipse/swt/opengl/GLContext.java - platform/eclipse.platform.swt - Git at Google

 /*******************************************************************************
  * Copyright (c) 2000, 2004 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  *     IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.swt.opengl;


 import org.eclipse.swt.*;
 import org.eclipse.swt.graphics.*;
 import org.eclipse.swt.internal.motif.*;
 import org.eclipse.swt.opengl.internal.motif.*;

 /**
  * Instances of <code>GLContext</code> are used to draw on swt <code>Drawable</code>s
  * through invocations of provided OpenGL functions.
  * <p>
  * Application code must explicitly invoke the <code>GLContext.dispose ()</code>
  * method to release the operating system resources managed by each instance
  * when those instances are no longer required. This is <em>particularly</em>
  * important on Windows95 and Windows98 where the operating system has a limited
  * number of device contexts available.
  * </p>
  */
 public class GLContext {
 	int handle;
 	int gc;
 	GCData data;
 	Drawable drawable;
 	int selectBufferPtr = 0;

 	static final int MSB_FIRST = 1;
 	static final int LSB_FIRST = 2;

 	/**
 	 * Constructs a new instance of this class which has been
 	 * configured to draw on the specified drawable.
 	 * <p>
 	 * You must dispose the <code>GLContext</code> when it is no longer required.
 	 * </p>
 	 *
 	 * @param drawable the drawable to draw on
 	 * @exception IllegalArgumentException <ul>
 	 *    <li>ERROR_NULL_ARGUMENT - if the drawable is null</li>
 	 * </ul>
 	 * @exception SWTError <ul>
 	 *    <li>ERROR_NO_HANDLES if a handle could not be obtained for gc creation</li>
 	 *    <li>ERROR_UNSUPPORTED_DEPTH - if the current display depth is not supported</li>
 	 * </ul>
 	 */
 	public GLContext (Drawable drawable) {
 		if (drawable == null) SWT.error (SWT.ERROR_NULL_ARGUMENT);
 		this.drawable = drawable;
 		this.data = new GCData ();
 		gc = drawable.internal_new_GC (data);
 		if (gc == 0) SWT.error (SWT.ERROR_NO_HANDLES);
 		int xDisplay = data.display;
 		int screen = OS.XDefaultScreen (xDisplay);
 		int depth = OS.XDefaultDepthOfScreen (OS.XDefaultScreenOfDisplay (xDisplay));
 		int attrib [] = {
 			XGL.GLX_LEVEL,
 			0,
 			XGL.GLX_RGBA,
 			XGL.GLX_DOUBLEBUFFER,
 //			XGL.GLX_DEPTH_SIZE,
 //			depth,
 			0
 		};
 		int infoPtr = XGL.glXChooseVisual (xDisplay, screen, attrib);
 		if (infoPtr == 0) SWT.error (SWT.ERROR_UNSUPPORTED_DEPTH);
 		XVisualInfo info = new XVisualInfo ();
 		XGL.memmove (info, infoPtr, XVisualInfo.sizeof);
 		OS.XFree (infoPtr);
 		handle = XGL.glXCreateContext (xDisplay, info, 0, false);
 		if (handle == 0) SWT.error (SWT.ERROR_NO_HANDLES);
 	}

 	public ImageData convertImageData (ImageData source) {
 		PaletteData palette = new PaletteData (0xff0000, 0xff00, 0xff);
 		ImageData newSource = new ImageData (source.width, source.height, 24, palette);
 		ImageDataUtil.blit (
 			1,
 			source.data,
 			source.depth,
 			source.bytesPerLine,
 			(source.depth != 16) ? MSB_FIRST : LSB_FIRST,
 			0,
 			0,
 			source.width,
 			source.height,
 			source.palette.redMask,
 			source.palette.greenMask,
 			source.palette.blueMask,
 			255,
 			null,
 			0,
 			0,
 			0,
 			newSource.data,
 			newSource.depth,
 			newSource.bytesPerLine,
 			(newSource.depth != 16) ? MSB_FIRST : LSB_FIRST,
 			0,
 			0,
 			newSource.width,
 			newSource.height,
 			newSource.palette.redMask,
 			newSource.palette.greenMask,
 			newSource.palette.blueMask,
 			false,
 			true);

 		return newSource;
 	}

 	/**
 	 * Disposes of the operating system resources associated with
 	 * the receiver. Applications must dispose of all <code>GLContext</code>s
 	 * that they allocate.
 	 */
 	public void dispose () {
 		if (handle == 0) return;
 		int xDisplay = data.display;
 		if (XGL.glXGetCurrentContext () == handle) {
 			XGL.glXMakeCurrent (xDisplay, 0, 0);
 		}
 		if (selectBufferPtr != 0) OS.XtFree (selectBufferPtr);
 		XGL.glXDestroyContext (xDisplay, handle);
 		handle = 0;
 		// drawable may be disposed
 		try {
 			drawable.internal_dispose_GC (gc, data);
 		} catch (SWTException e) {
 		}
 		gc = 0;
 		data.display = data.drawable = data.colormap = 0;
 		/*data.fontList =*/ data.clipRgn = data.renderTable = 0;
 		drawable = null;
 		data.device = null;
 		data.image = null;
 		//data.codePage = null;
 		data = null;
 	}

 	public int[] getSelectBuffer (int selectBufferPtr, int[] selectBuffer) {
 		OS.memmove (selectBuffer, selectBufferPtr, selectBuffer.length * 4);
 		return selectBuffer;
 	}

 	public int getSelectBufferPtr (int[] selectBuffer) {
 		if (selectBufferPtr == 0) {
 			selectBufferPtr = OS.XtMalloc (selectBuffer.length * 4);
 		}
 		OS.memmove (selectBufferPtr, selectBuffer, selectBuffer.length * 4);
 		return selectBufferPtr;
 	}

 	/**
 	 * Returns a boolean indicating whether the receiver is the current
 	 * <code>GLContext</code>.
 	 *
 	 * @return true if the receiver is the current <code>GLContext</code>,
 	 * false otherwise
 	 * @exception SWTError <ul>
 	 *    <li>ERROR_GRAPHIC_DISPOSED if the receiver is disposed</li>
 	 * </ul>
 	 */
 	public boolean isCurrent () {
 		if (isDisposed ()) 	SWT.error (SWT.ERROR_GRAPHIC_DISPOSED);
 		return XGL.glXGetCurrentContext () == handle;
 	}

 	/**
 	 * Returns a boolean indicating whether the <code>GLContext</code> has been
 	 * disposed.
 	 * <p>
 	 * This method gets the dispose state for the <code>GLContext</code>.
 	 * When a <code>GLContext</code> has been disposed, it is an error to
 	 * invoke any other method using the <code>GLContext</code>.
 	 *
 	 * @return true if the <code>GLContext</code> is disposed, false otherwise
 	 */
 	public boolean isDisposed () {
 		return handle == 0;
 	}

 	/**
 	 * Loads the specified bitmap font.
 	 *
 	 * @param fdata
 	 * @param device
 	 * @param base
 	 * @param first
 	 * @param count
 	 */
 	public void loadBitmapFont (FontData fdata, Device device, int base, int startIndex, int length) {
 		/* Temporary code, due some problems when running on UTF-8 loadBitmapFont ()
 		 * is restrict to works only for ascii.
 		 * Note: en_US.ISO8859-1 also code be used.
 		 */
 		fdata.setLocale ("C");
 		Font font = new Font (device, fdata);
 		int fontList = font.handle;
 		int[] buffer = new int [1];
 		if (!OS.XmFontListInitFontContext (buffer, fontList)) return;
 		int context = buffer [0];
 		XFontStruct fontStruct = new XFontStruct ();
 		int fontListEntry;
 		int[] fontStructPtr = new int [1];
 		int[] fontNamePtr = new int [1];
 		int xfont = 0;
 		// go through each entry in the font list
 		while ((fontListEntry = OS.XmFontListNextEntry (context)) != 0) {
 			int fontPtr = OS.XmFontListEntryGetFont (fontListEntry, buffer);
 			if (buffer [0] == OS.XmFONT_IS_FONT) {
 				// FontList contains a single font
 				OS.memmove (fontStruct, fontPtr, 20 * 4);
 				xfont = fontStruct.fid;
 			} else {
 				// FontList contains a fontSet
 				int nFonts = OS.XFontsOfFontSet (fontPtr, fontStructPtr, fontNamePtr);
 				int[] fontStructs = new int [nFonts];
 				OS.memmove (fontStructs, fontStructPtr [0], nFonts * 4);
 				// Go through each fontStruct in the font set.
 				for (int i = 0; i < nFonts; i++) {
 					OS.memmove (fontStruct, fontStructs [i], XFontStruct.sizeof);
 					xfont = fontStruct.fid;
 				}
 			}
 		}
 		if (xfont != 0) {
 			XGL.glXUseXFont (xfont, startIndex, length, base);
 		}
 		font.dispose ();
 		OS.XmFontListFreeFontContext (context);
 	}

 	/**
 	 * Loads the specified outline font.
 	 *
 	 * @param fdata
 	 * @param device
 	 * @param base
 	 * @param first
 	 * @param count
 	 * @param deviation
 	 * @param extrusion
 	 * @param format
 	 * @param lpgmf
 	 */
 	public void loadOutlineFont (FontData fdata, Device device, int base, int first,
 	int count, float deviation, float extrusion, int format, GLYPHMETRICSFLOAT[] lpgmf) {
 		// stub
 	}

 	/**
 	 * Resizes the receiver.
 	 *
 	 * @param x
 	 * @param y
 	 * @param width
 	 * @param height
 	 */
 	public void resize (int x, int y, int width, int height) {
 		if (height == 0) height = 1;
 		GL.glViewport (x, y, width, height);
 		GL.glMatrixMode (GL.GL_PROJECTION);
 		GL.glLoadIdentity ();
 		GLU.gluPerspective (45.0f, (float) width / (float) height, 0.1f, 100.0f);
 		GL.glMatrixMode (GL.GL_MODELVIEW);
 		GL.glLoadIdentity ();
 	}

 	/**
 	 * Sets the receiver to be the current <code>GLContext</code>.
 	 *
 	 * @exception SWTError <ul>
 	 *    <li>ERROR_GRAPHIC_DISPOSED if the receiver is disposed</li>
 	 * </ul>
 	 */
 	public void setCurrent () {
 		if (isDisposed ()) SWT.error (SWT.ERROR_GRAPHIC_DISPOSED);
 		if (XGL.glXGetCurrentContext () == handle) return;
 		XGL.glXMakeCurrent (data.display, data.drawable, handle);
 	}

 	/**
 	 * Swaps the receiver's buffers.
 	 *
 	 * @exception SWTError <ul>
 	 *    <li>ERROR_GRAPHIC_DISPOSED if the receiver is disposed</li>
 	 * </ul>
 	 */
 	public void swapBuffers () {
 		if (isDisposed ()) SWT.error (SWT.ERROR_GRAPHIC_DISPOSED);
 		XGL.glXSwapBuffers (data.display, data.drawable);
 	}
 }
	/*******************************************************************************
	* Copyright (c) 2000, 2004 IBM Corporation and others.
	* All rights reserved. This program and the accompanying materials
	* are made available under the terms of the Eclipse Public License v1.0
	* which accompanies this distribution, and is available at
	* http://www.eclipse.org/legal/epl-v10.html
	*
	* Contributors:
	* IBM Corporation - initial API and implementation
	*******************************************************************************/
	package org.eclipse.swt.opengl;


	import org.eclipse.swt.*;
	import org.eclipse.swt.graphics.*;
	import org.eclipse.swt.internal.motif.*;
	import org.eclipse.swt.opengl.internal.motif.*;

	/**
	* Instances of <code>GLContext</code> are used to draw on swt <code>Drawable</code>s
	* through invocations of provided OpenGL functions.
	* <p>
	* Application code must explicitly invoke the <code>GLContext.dispose ()</code>
	* method to release the operating system resources managed by each instance
	* when those instances are no longer required. This is <em>particularly</em>
	* important on Windows95 and Windows98 where the operating system has a limited
	* number of device contexts available.
	* </p>
	*/
	public class GLContext {
	int handle;
	int gc;
	GCData data;
	Drawable drawable;
	int selectBufferPtr = 0;

	static final int MSB_FIRST = 1;
	static final int LSB_FIRST = 2;

	/**
	* Constructs a new instance of this class which has been
	* configured to draw on the specified drawable.
	* <p>
	* You must dispose the <code>GLContext</code> when it is no longer required.
	* </p>
	*
	* @param drawable the drawable to draw on
	* @exception IllegalArgumentException <ul>
	* <li>ERROR_NULL_ARGUMENT - if the drawable is null</li>
	* </ul>
	* @exception SWTError <ul>
	* <li>ERROR_NO_HANDLES if a handle could not be obtained for gc creation</li>
	* <li>ERROR_UNSUPPORTED_DEPTH - if the current display depth is not supported</li>
	* </ul>
	*/
	public GLContext (Drawable drawable) {
	if (drawable == null) SWT.error (SWT.ERROR_NULL_ARGUMENT);
	this.drawable = drawable;
	this.data = new GCData ();
	gc = drawable.internal_new_GC (data);
	if (gc == 0) SWT.error (SWT.ERROR_NO_HANDLES);
	int xDisplay = data.display;
	int screen = OS.XDefaultScreen (xDisplay);
	int depth = OS.XDefaultDepthOfScreen (OS.XDefaultScreenOfDisplay (xDisplay));
	int attrib [] = {
	XGL.GLX_LEVEL,
	0,
	XGL.GLX_RGBA,
	XGL.GLX_DOUBLEBUFFER,
	// XGL.GLX_DEPTH_SIZE,
	// depth,
	0
	};
	int infoPtr = XGL.glXChooseVisual (xDisplay, screen, attrib);
	if (infoPtr == 0) SWT.error (SWT.ERROR_UNSUPPORTED_DEPTH);
	XVisualInfo info = new XVisualInfo ();
	XGL.memmove (info, infoPtr, XVisualInfo.sizeof);
	OS.XFree (infoPtr);
	handle = XGL.glXCreateContext (xDisplay, info, 0, false);
	if (handle == 0) SWT.error (SWT.ERROR_NO_HANDLES);
	}

	public ImageData convertImageData (ImageData source) {
	PaletteData palette = new PaletteData (0xff0000, 0xff00, 0xff);
	ImageData newSource = new ImageData (source.width, source.height, 24, palette);
	ImageDataUtil.blit (
	1,
	source.data,
	source.depth,
	source.bytesPerLine,
	(source.depth != 16) ? MSB_FIRST : LSB_FIRST,
	0,
	0,
	source.width,
	source.height,
	source.palette.redMask,
	source.palette.greenMask,
	source.palette.blueMask,
	255,
	null,
	0,
	0,
	0,
	newSource.data,
	newSource.depth,
	newSource.bytesPerLine,
	(newSource.depth != 16) ? MSB_FIRST : LSB_FIRST,
	0,
	0,
	newSource.width,
	newSource.height,
	newSource.palette.redMask,
	newSource.palette.greenMask,
	newSource.palette.blueMask,
	false,
	true);

	return newSource;
	}

	/**
	* Disposes of the operating system resources associated with
	* the receiver. Applications must dispose of all <code>GLContext</code>s
	* that they allocate.
	*/
	public void dispose () {
	if (handle == 0) return;
	int xDisplay = data.display;
	if (XGL.glXGetCurrentContext () == handle) {
	XGL.glXMakeCurrent (xDisplay, 0, 0);
	}
	if (selectBufferPtr != 0) OS.XtFree (selectBufferPtr);
	XGL.glXDestroyContext (xDisplay, handle);
	handle = 0;
	// drawable may be disposed
	try {
	drawable.internal_dispose_GC (gc, data);
	} catch (SWTException e) {
	}
	gc = 0;
	data.display = data.drawable = data.colormap = 0;
	/data.fontList =/ data.clipRgn = data.renderTable = 0;
	drawable = null;
	data.device = null;
	data.image = null;
	//data.codePage = null;
	data = null;
	}

	public int[] getSelectBuffer (int selectBufferPtr, int[] selectBuffer) {
	OS.memmove (selectBuffer, selectBufferPtr, selectBuffer.length * 4);
	return selectBuffer;
	}

	public int getSelectBufferPtr (int[] selectBuffer) {
	if (selectBufferPtr == 0) {
	selectBufferPtr = OS.XtMalloc (selectBuffer.length * 4);
	}
	OS.memmove (selectBufferPtr, selectBuffer, selectBuffer.length * 4);
	return selectBufferPtr;
	}

	/**
	* Returns a boolean indicating whether the receiver is the current
	* <code>GLContext</code>.
	*
	* @return true if the receiver is the current <code>GLContext</code>,
	* false otherwise
	* @exception SWTError <ul>
	* <li>ERROR_GRAPHIC_DISPOSED if the receiver is disposed</li>
	* </ul>
	*/
	public boolean isCurrent () {
	if (isDisposed ()) SWT.error (SWT.ERROR_GRAPHIC_DISPOSED);
	return XGL.glXGetCurrentContext () == handle;
	}

	/**
	* Returns a boolean indicating whether the <code>GLContext</code> has been
	* disposed.
	* <p>
	* This method gets the dispose state for the <code>GLContext</code>.
	* When a <code>GLContext</code> has been disposed, it is an error to
	* invoke any other method using the <code>GLContext</code>.
	*
	* @return true if the <code>GLContext</code> is disposed, false otherwise
	*/
	public boolean isDisposed () {
	return handle == 0;
	}

	/**
	* Loads the specified bitmap font.
	*
	* @param fdata
	* @param device
	* @param base
	* @param first
	* @param count
	*/
	public void loadBitmapFont (FontData fdata, Device device, int base, int startIndex, int length) {
	/* Temporary code, due some problems when running on UTF-8 loadBitmapFont ()
	* is restrict to works only for ascii.
	* Note: en_US.ISO8859-1 also code be used.
	*/
	fdata.setLocale ("C");
	Font font = new Font (device, fdata);
	int fontList = font.handle;
	int[] buffer = new int [1];
	if (!OS.XmFontListInitFontContext (buffer, fontList)) return;
	int context = buffer [0];
	XFontStruct fontStruct = new XFontStruct ();
	int fontListEntry;
	int[] fontStructPtr = new int [1];
	int[] fontNamePtr = new int [1];
	int xfont = 0;
	// go through each entry in the font list
	while ((fontListEntry = OS.XmFontListNextEntry (context)) != 0) {
	int fontPtr = OS.XmFontListEntryGetFont (fontListEntry, buffer);
	if (buffer [0] == OS.XmFONT_IS_FONT) {
	// FontList contains a single font
	OS.memmove (fontStruct, fontPtr, 20 * 4);
	xfont = fontStruct.fid;
	} else {
	// FontList contains a fontSet
	int nFonts = OS.XFontsOfFontSet (fontPtr, fontStructPtr, fontNamePtr);
	int[] fontStructs = new int [nFonts];
	OS.memmove (fontStructs, fontStructPtr [0], nFonts * 4);
	// Go through each fontStruct in the font set.
	for (int i = 0; i < nFonts; i++) {
	OS.memmove (fontStruct, fontStructs [i], XFontStruct.sizeof);
	xfont = fontStruct.fid;
	}
	}
	}
	if (xfont != 0) {
	XGL.glXUseXFont (xfont, startIndex, length, base);
	}
	font.dispose ();
	OS.XmFontListFreeFontContext (context);
	}

	/**
	* Loads the specified outline font.
	*
	* @param fdata
	* @param device
	* @param base
	* @param first
	* @param count
	* @param deviation
	* @param extrusion
	* @param format
	* @param lpgmf
	*/
	public void loadOutlineFont (FontData fdata, Device device, int base, int first,
	int count, float deviation, float extrusion, int format, GLYPHMETRICSFLOAT[] lpgmf) {
	// stub
	}

	/**
	* Resizes the receiver.
	*
	* @param x
	* @param y
	* @param width
	* @param height
	*/
	public void resize (int x, int y, int width, int height) {
	if (height == 0) height = 1;
	GL.glViewport (x, y, width, height);
	GL.glMatrixMode (GL.GL_PROJECTION);
	GL.glLoadIdentity ();
	GLU.gluPerspective (45.0f, (float) width / (float) height, 0.1f, 100.0f);
	GL.glMatrixMode (GL.GL_MODELVIEW);
	GL.glLoadIdentity ();
	}

	/**
	* Sets the receiver to be the current <code>GLContext</code>.
	*
	* @exception SWTError <ul>
	* <li>ERROR_GRAPHIC_DISPOSED if the receiver is disposed</li>
	* </ul>
	*/
	public void setCurrent () {
	if (isDisposed ()) SWT.error (SWT.ERROR_GRAPHIC_DISPOSED);
	if (XGL.glXGetCurrentContext () == handle) return;
	XGL.glXMakeCurrent (data.display, data.drawable, handle);
	}

	/**
	* Swaps the receiver's buffers.
	*
	* @exception SWTError <ul>
	* <li>ERROR_GRAPHIC_DISPOSED if the receiver is disposed</li>
	* </ul>
	*/
	public void swapBuffers () {
	if (isDisposed ()) SWT.error (SWT.ERROR_GRAPHIC_DISPOSED);
	XGL.glXSwapBuffers (data.display, data.drawable);
	}
	}