1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
|
/*******************************************************************************
* Copyright (c) 2000, 2003 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.opengl.internal.win32.*;
import org.eclipse.swt.internal.win32.*;
import org.eclipse.swt.widgets.*;
/**
* GLCanvas is a widget capable of displaying OpenGL content.
*/
public class GLCanvas extends Canvas {
int context;
int pixelFormat;
/**
* 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>ERROR_UNSUPPORTED_DEPTH when the requested attributes cannot be provided</ul>
* @exception SWTException
* <ul><li>ERROR_THREAD_INVALID_ACCESS when called from the wrong thread
* <li>ERROR_CANNOT_CREATE_OBJECT when failed to create OLE Object
* <li>ERROR_CANNOT_OPEN_FILE when failed to open file
* <li>ERROR_INTERFACE_NOT_FOUND when unable to create callbacks for OLE Interfaces
* <li>ERROR_INVALID_CLASSID
* </ul>
*/
public GLCanvas (Composite parent, int style, GLData data) {
super (parent, style);
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;
// }
int hDC = OS.GetDC (handle);
pixelFormat = WGL.ChoosePixelFormat (hDC, pfd);
if (pixelFormat == 0) {
OS.ReleaseDC (handle, hDC);
SWT.error (SWT.ERROR_UNSUPPORTED_DEPTH);
}
if (!WGL.SetPixelFormat (hDC, pixelFormat, pfd)) {
OS.ReleaseDC (handle, hDC);
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 (share != null) {
// WGL.wglShareLists (context, share.context);
// }
Listener listener = new Listener () {
public void handleEvent (Event event) {
switch (event.type) {
case SWT.Dispose:
WGL.wglDeleteContext (context);
break;
}
}
};
addListener (SWT.Dispose, listener);
}
/**
* 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;
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 () == handle;
}
/**
* 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 () == handle) return;
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 ();
int hDC = OS.GetDC (handle);
WGL.SwapBuffers (hDC);
OS.ReleaseDC (handle, hDC);
}
}
|
