package org.eclipse.swt.opengl;
import org.eclipse.swt.*;
import org.eclipse.swt.widgets.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.internal.gtk.*;
import org.eclipse.swt.internal.opengl.gtk.*;
import org.eclipse.opengl.*;
/**
* GLCanvas is a widget capable of displaying OpenGL content.
*/
public class GLCanvas extends Canvas {
int /*long*/ xdisplay;
int /*long*/ xid;
int /*long*/ context;
int /*long*/ glWindow;
XVisualInfo vinfo;
private static final int MAX_ATTRIBUTES = 32;
/**
* 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);
int glxAttrib [] = new int [MAX_ATTRIBUTES];
int pos = 0;
OS.gtk_widget_realize (handle);
int /*long*/ window = OS.GTK_WIDGET_WINDOW (handle);
xdisplay = OS.gdk_x11_drawable_get_xdisplay (window);
int xscreen = OS.XDefaultScreen (xdisplay);
glxAttrib [pos++] = GLX.GLX_RGBA;
if (data.doubleBuffer) glxAttrib [pos++] = GLX.GLX_DOUBLEBUFFER;
if (data.stereo) glxAttrib [pos++] = GLX.GLX_STEREO;
if (data.redSize > 0) {
glxAttrib [pos++] = GLX.GLX_RED_SIZE;
glxAttrib [pos++] = data.redSize;
}
if (data.greenSize > 0) {
glxAttrib [pos++] = GLX.GLX_GREEN_SIZE;
glxAttrib [pos++] = data.greenSize;
}
if (data.blueSize > 0) {
glxAttrib [pos++] = GLX.GLX_BLUE_SIZE;
glxAttrib [pos++] = data.blueSize;
}
if (data.alphaSize > 0) {
glxAttrib [pos++] = GLX.GLX_ALPHA_SIZE;
glxAttrib [pos++] = data.alphaSize;
}
if (data.depthSize > 0) {
glxAttrib [pos++] = GLX.GLX_DEPTH_SIZE;
glxAttrib [pos++] = data.depthSize;
}
if (data.stencilSize > 0) {
glxAttrib [pos++] = GLX.GLX_STENCIL_SIZE;
glxAttrib [pos++] = data.stencilSize;
}
if (data.accumRedSize > 0) {
glxAttrib [pos++] = GLX.GLX_ACCUM_RED_SIZE;
glxAttrib [pos++] = data.accumRedSize;
}
if (data.accumGreenSize > 0) {
glxAttrib [pos++] = GLX.GLX_ACCUM_GREEN_SIZE;
glxAttrib [pos++] = data.accumGreenSize;
}
if (data.accumBlueSize > 0) {
glxAttrib [pos++] = GLX.GLX_ACCUM_BLUE_SIZE;
glxAttrib [pos++] = data.accumBlueSize;
}
if (data.accumAlphaSize > 0) {
glxAttrib [pos++] = GLX.GLX_ACCUM_ALPHA_SIZE;
glxAttrib [pos++] = data.accumAlphaSize;
}
if (data.sampleBuffers > 0) {
glxAttrib [pos++] = GLX.GLX_SAMPLE_BUFFERS;
glxAttrib [pos++] = data.sampleBuffers;
}
if (data.samples > 0) {
glxAttrib [pos++] = GLX.GLX_SAMPLES;
glxAttrib [pos++] = data.samples;
}
glxAttrib [pos++] = 0;
int infoPtr = GLX.glXChooseVisual (xdisplay, xscreen, glxAttrib);
if (infoPtr == 0) SWT.error (SWT.ERROR_UNSUPPORTED_DEPTH);
vinfo = new XVisualInfo ();
GLX.memmove (vinfo, infoPtr, XVisualInfo.sizeof);
OS.XFree (infoPtr);
int /*long*/ screen = OS.gdk_screen_get_default ();
int /*long*/ gdkvisual = OS.gdk_x11_screen_lookup_visual (screen, vinfo.visualid);
//context = GLX.glXCreateContext (xdisplay, info, share == null ? 0 : share.context, true);
context = GLX.glXCreateContext (xdisplay, vinfo, 0, true);
if (context == 0) SWT.error (SWT.ERROR_NO_HANDLES);
GdkWindowAttr attrs = new GdkWindowAttr ();
attrs.width = 1;
attrs.height = 1;
attrs.event_mask = OS.GDK_KEY_PRESS_MASK | OS.GDK_KEY_RELEASE_MASK |
OS.GDK_FOCUS_CHANGE_MASK | OS.GDK_POINTER_MOTION_MASK |
OS.GDK_BUTTON_PRESS_MASK | OS.GDK_BUTTON_RELEASE_MASK |
OS.GDK_ENTER_NOTIFY_MASK | OS.GDK_LEAVE_NOTIFY_MASK |
OS.GDK_EXPOSURE_MASK | OS.GDK_VISIBILITY_NOTIFY_MASK;
attrs.window_type = OS.GDK_WINDOW_CHILD;
attrs.visual = gdkvisual;
glWindow = OS.gdk_window_new (window, attrs, OS.GDK_WA_VISUAL);
OS.gdk_window_set_user_data (glWindow, handle);
xid = OS.gdk_x11_drawable_get_xid (glWindow);
OS.gdk_window_show (glWindow);
Listener listener = new Listener () {
public void handleEvent (Event event) {
switch (event.type) {
case SWT.Paint:
/**
* Bug in MESA. MESA does some nasty sort of polling to try
* and ensure that their buffer sizes match the current X state.
* This state can be updated using glViewport().
* FIXME: There has to be a better way of doing this.
*/
int [] viewport = new int [4];
GL.glGetIntegerv (GL.GL_VIEWPORT, viewport);
GL.glViewport (viewport [0],viewport [1],viewport [2],viewport [3]);
break;
case SWT.Resize:
Rectangle clientArea = getClientArea();
OS.gdk_window_move (glWindow, clientArea.x, clientArea.y);
OS.gdk_window_resize (glWindow, clientArea.width, clientArea.height);
break;
case SWT.Dispose:
if (context != 0) {
if (GLX.glXGetCurrentContext () == context) {
GLX.glXMakeCurrent(xdisplay, 0, 0);
}
GLX.glXDestroyContext (xdisplay, context);
context = 0;
}
if (glWindow != 0) {
OS.gdk_window_destroy (glWindow);
glWindow = 0;
}
break;
}
}
};
addListener (SWT.Resize, listener);
addListener (SWT.Paint, listener);
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 ();
int [] value = new int [1];
GLX.glXGetConfig (xdisplay, vinfo, GLX.GLX_DOUBLEBUFFER, value);
data.doubleBuffer = value [0] != 0;
GLX.glXGetConfig (xdisplay, vinfo, GLX.GLX_STEREO, value);
data.stereo = value [0] != 0;
GLX.glXGetConfig (xdisplay, vinfo, GLX.GLX_RED_SIZE, value);
data.redSize = value [0];
GLX.glXGetConfig (xdisplay, vinfo, GLX.GLX_GREEN_SIZE, value);
data.greenSize = value [0];
GLX.glXGetConfig (xdisplay, vinfo, GLX.GLX_BLUE_SIZE, value);
data.blueSize = value [0];
GLX.glXGetConfig (xdisplay, vinfo, GLX.GLX_ALPHA_SIZE, value);
data.alphaSize = value [0];
GLX.glXGetConfig (xdisplay, vinfo, GLX.GLX_DEPTH_SIZE, value);
data.depthSize = value [0];
GLX.glXGetConfig (xdisplay, vinfo, GLX.GLX_STENCIL_SIZE, value);
data.stencilSize = value [0];
GLX.glXGetConfig (xdisplay, vinfo, GLX.GLX_ACCUM_RED_SIZE, value);
data.accumRedSize = value [0];
GLX.glXGetConfig (xdisplay, vinfo, GLX.GLX_ACCUM_GREEN_SIZE, value);
data.accumGreenSize = value [0];
GLX.glXGetConfig (xdisplay, vinfo, GLX.GLX_ACCUM_BLUE_SIZE, value);
data.accumBlueSize = value [0];
GLX.glXGetConfig (xdisplay, vinfo, GLX.GLX_ACCUM_ALPHA_SIZE, value);
data.accumAlphaSize = value [0];
GLX.glXGetConfig (xdisplay, vinfo, GLX.GLX_SAMPLE_BUFFERS, value);
data.sampleBuffers = value [0];
GLX.glXGetConfig (xdisplay, vinfo, GLX.GLX_SAMPLES, value);
data.samples = value [0];
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 GLX.glXGetCurrentContext () == 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 (GLX.glXGetCurrentContext () == context) return;
GLX.glXMakeCurrent (xdisplay, xid, context);
}
/**
* 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 ();
GLX.glXSwapBuffers (xdisplay, xid);
}
}