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/*******************************************************************************
* Copyright (c) 2000, 2016 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.swt.opengl;
import org.eclipse.swt.*;
import org.eclipse.swt.internal.opengl.win32.*;
import org.eclipse.swt.internal.win32.*;
import org.eclipse.swt.widgets.*;
/**
* GLCanvas is a widget capable of displaying OpenGL content.
*
* @see GLData
* @see <a href="http://www.eclipse.org/swt/snippets/#opengl">OpenGL snippets</a>
* @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
*
* @since 3.2
*/
public class GLCanvas extends Canvas {
long /*int*/ context;
int pixelFormat;
static final String USE_OWNDC_KEY = "org.eclipse.swt.internal.win32.useOwnDC"; //$NON-NLS-1$
/**
* Create a GLCanvas widget using the attributes described in the GLData
* object provided.
*
* @param parent a composite widget
* @param style the bitwise OR'ing of widget styles
* @param data the requested attributes of the GLCanvas
*
* @exception IllegalArgumentException
* <ul><li>ERROR_NULL_ARGUMENT when the data is null</li>
* <li>ERROR_UNSUPPORTED_DEPTH when the requested attributes cannot be provided</li>
* </ul>
*/
public GLCanvas (Composite parent, int style, GLData data) {
super (parent, checkStyle (parent, style));
parent.getDisplay ().setData (USE_OWNDC_KEY, false);
if (data == null) SWT.error (SWT.ERROR_NULL_ARGUMENT);
PIXELFORMATDESCRIPTOR pfd = new PIXELFORMATDESCRIPTOR ();
pfd.nSize = (short) PIXELFORMATDESCRIPTOR.sizeof;
pfd.nVersion = 1;
pfd.dwFlags = WGL.PFD_DRAW_TO_WINDOW | WGL.PFD_SUPPORT_OPENGL;
pfd.dwLayerMask = WGL.PFD_MAIN_PLANE;
pfd.iPixelType = (byte) WGL.PFD_TYPE_RGBA;
if (data.doubleBuffer) pfd.dwFlags |= WGL.PFD_DOUBLEBUFFER;
if (data.stereo) pfd.dwFlags |= WGL.PFD_STEREO;
pfd.cRedBits = (byte) data.redSize;
pfd.cGreenBits = (byte) data.greenSize;
pfd.cBlueBits = (byte) data.blueSize;
pfd.cAlphaBits = (byte) data.alphaSize;
pfd.cDepthBits = (byte) data.depthSize;
pfd.cStencilBits = (byte) data.stencilSize;
pfd.cAccumRedBits = (byte) data.accumRedSize;
pfd.cAccumGreenBits = (byte) data.accumGreenSize;
pfd.cAccumBlueBits = (byte) data.accumBlueSize;
pfd.cAccumAlphaBits = (byte) data.accumAlphaSize;
pfd.cAccumBits = (byte) (pfd.cAccumRedBits + pfd.cAccumGreenBits + pfd.cAccumBlueBits + pfd.cAccumAlphaBits);
//FIXME - use wglChoosePixelFormatARB
// if (data.sampleBuffers > 0) {
// wglAttrib [pos++] = WGL.WGL_SAMPLE_BUFFERS_ARB;
// wglAttrib [pos++] = data.sampleBuffers;
// }
// if (data.samples > 0) {
// wglAttrib [pos++] = WGL.WGL_SAMPLES_ARB;
// wglAttrib [pos++] = data.samples;
// }
long /*int*/ hDC = OS.GetDC (handle);
pixelFormat = WGL.ChoosePixelFormat (hDC, pfd);
if (pixelFormat == 0 || !WGL.SetPixelFormat (hDC, pixelFormat, pfd)) {
OS.ReleaseDC (handle, hDC);
dispose ();
SWT.error (SWT.ERROR_UNSUPPORTED_DEPTH);
}
context = WGL.wglCreateContext (hDC);
if (context == 0) {
OS.ReleaseDC (handle, hDC);
SWT.error (SWT.ERROR_NO_HANDLES);
}
OS.ReleaseDC (handle, hDC);
if (data.shareContext != null) {
WGL.wglShareLists (data.shareContext.context, context);
}
Listener listener = event -> {
switch (event.type) {
case SWT.Dispose:
WGL.wglDeleteContext (context);
break;
}
};
addListener (SWT.Dispose, listener);
}
static int checkStyle(Composite parent, int style) {
if (parent != null) {
parent.getDisplay ().setData (USE_OWNDC_KEY, true);
}
return style;
}
/**
* Returns a GLData object describing the created context.
*
* @return GLData description of the OpenGL context attributes
* @exception SWTException <ul>
* <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
* <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
* </ul>
*/
public GLData getGLData () {
checkWidget ();
GLData data = new GLData ();
PIXELFORMATDESCRIPTOR pfd = new PIXELFORMATDESCRIPTOR ();
pfd.nSize = (short) PIXELFORMATDESCRIPTOR.sizeof;
long /*int*/ hDC = OS.GetDC (handle);
WGL.DescribePixelFormat (hDC, pixelFormat, PIXELFORMATDESCRIPTOR.sizeof, pfd);
OS.ReleaseDC (handle, hDC);
data.doubleBuffer = (pfd.dwFlags & WGL.PFD_DOUBLEBUFFER) != 0;
data.stereo = (pfd.dwFlags & WGL.PFD_STEREO) != 0;
data.redSize = pfd.cRedBits;
data.greenSize = pfd.cGreenBits;
data.blueSize = pfd.cBlueBits;
data.alphaSize = pfd.cAlphaBits;
data.depthSize = pfd.cDepthBits;
data.stencilSize = pfd.cStencilBits;
data.accumRedSize = pfd.cAccumRedBits;
data.accumGreenSize = pfd.cAccumGreenBits;
data.accumBlueSize = pfd.cAccumBlueBits;
data.accumAlphaSize = pfd.cAccumAlphaBits;
return data;
}
/**
* Returns a boolean indicating whether the receiver's OpenGL context
* is the current context.
*
* @return true if the receiver holds the current OpenGL context,
* false otherwise
* @exception SWTException <ul>
* <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
* <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
* </ul>
*/
public boolean isCurrent () {
checkWidget ();
return WGL.wglGetCurrentContext () == context;
}
/**
* Sets the OpenGL context associated with this GLCanvas to be the
* current GL context.
*
* @exception SWTException <ul>
* <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
* <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
* </ul>
*/
public void setCurrent () {
checkWidget ();
if (WGL.wglGetCurrentContext () == context) return;
long /*int*/ hDC = OS.GetDC (handle);
WGL.wglMakeCurrent (hDC, context);
OS.ReleaseDC (handle, hDC);
}
/**
* Swaps the front and back color buffers.
*
* @exception SWTException <ul>
* <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
* <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
* </ul>
*/
public void swapBuffers () {
checkWidget ();
long /*int*/ hDC = OS.GetDC (handle);
WGL.SwapBuffers (hDC);
OS.ReleaseDC (handle, hDC);
}
}
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