Back to index...

	/*
	* Copyright (c) 2004, 2013, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/

	package sun.java2d.opengl;

	import sun.java2d.pipe.BufferedContext;
	import sun.java2d.pipe.RenderBuffer;
	import sun.java2d.pipe.RenderQueue;
	import sun.java2d.pipe.hw.ContextCapabilities;
	import static sun.java2d.pipe.BufferedOpCodes.*;
	import static sun.java2d.pipe.hw.ContextCapabilities.*;

	import java.lang.annotation.Native;

	/**
	* Note that the RenderQueue lock must be acquired before calling any of
	* the methods in this class.
	*/
	public class OGLContext extends BufferedContext {

	private final OGLGraphicsConfig config;

	OGLContext(RenderQueue rq, OGLGraphicsConfig config) {
	super(rq);
	this.config = config;
	}

	/**
	* Convenience method that delegates to setScratchSurface() below.
	*/
	static void setScratchSurface(OGLGraphicsConfig gc) {
	setScratchSurface(gc.getNativeConfigInfo());
	}

	/**
	* Makes the given GraphicsConfig's context current to its associated
	* "scratch surface". Each GraphicsConfig maintains a native context
	* (GLXContext on Unix, HGLRC on Windows) as well as a native pbuffer
	* known as the "scratch surface". By making the context current to the
	* scratch surface, we are assured that we have a current context for
	* the relevant GraphicsConfig, and can therefore perform operations
	* depending on the capabilities of that GraphicsConfig. For example,
	* if the GraphicsConfig supports the GL_ARB_texture_non_power_of_two
	* extension, then we should be able to make a non-pow2 texture for this
	* GraphicsConfig once we make the context current to the scratch surface.
	*
	* This method should be used for operations with an OpenGL texture
	* as the destination surface (e.g. a sw->texture blit loop), or in those
	* situations where we may not otherwise have a current context (e.g.
	* when disposing a texture-based surface).
	*/
	static void setScratchSurface(long pConfigInfo) {
	// assert OGLRenderQueue.getInstance().lock.isHeldByCurrentThread();

	// invalidate the current context
	currentContext = null;

	// set the scratch context
	OGLRenderQueue rq = OGLRenderQueue.getInstance();
	RenderBuffer buf = rq.getBuffer();
	rq.ensureCapacityAndAlignment(12, 4);
	buf.putInt(SET_SCRATCH_SURFACE);
	buf.putLong(pConfigInfo);
	}

	/**
	* Invalidates the currentContext field to ensure that we properly
	* revalidate the OGLContext (make it current, etc.) next time through
	* the validate() method. This is typically invoked from methods
	* that affect the current context state (e.g. disposing a context or
	* surface).
	*/
	static void invalidateCurrentContext() {
	// assert OGLRenderQueue.getInstance().lock.isHeldByCurrentThread();

	// invalidate the current Java-level context so that we
	// revalidate everything the next time around
	if (currentContext != null) {
	currentContext.invalidateContext();
	currentContext = null;
	}

	// invalidate the context reference at the native level, and
	// then flush the queue so that we have no pending operations
	// dependent on the current context
	OGLRenderQueue rq = OGLRenderQueue.getInstance();
	rq.ensureCapacity(4);
	rq.getBuffer().putInt(INVALIDATE_CONTEXT);
	rq.flushNow();
	}

	public RenderQueue getRenderQueue() {
	return OGLRenderQueue.getInstance();
	}

	/**
	* Returns a string representing adapter id (vendor, renderer, version).
	* Must be called on the rendering thread.
	*
	* @return an id string for the adapter
	*/
	static final native String getOGLIdString();

	@Override
	public void saveState() {
	// assert rq.lock.isHeldByCurrentThread();

	// reset all attributes of this and current contexts
	invalidateContext();
	invalidateCurrentContext();

	setScratchSurface(config);

	// save the state on the native level
	rq.ensureCapacity(4);
	buf.putInt(SAVE_STATE);
	rq.flushNow();
	}

	@Override
	public void restoreState() {
	// assert rq.lock.isHeldByCurrentThread();

	// reset all attributes of this and current contexts
	invalidateContext();
	invalidateCurrentContext();

	setScratchSurface(config);

	// restore the state on the native level
	rq.ensureCapacity(4);
	buf.putInt(RESTORE_STATE);
	rq.flushNow();
	}

	static class OGLContextCaps extends ContextCapabilities {
	/**
	* Indicates the presence of the GL_EXT_framebuffer_object extension.
	* This cap will only be set if the fbobject system property has been
	* enabled and we are able to create an FBO with depth buffer.
	*/
	@Native
	static final int CAPS_EXT_FBOBJECT =
	(CAPS_RT_TEXTURE_ALPHA \| CAPS_RT_TEXTURE_OPAQUE);
	/** Indicates that the context supports a stored alpha channel. */
	@Native
	static final int CAPS_STORED_ALPHA = CAPS_RT_PLAIN_ALPHA;
	/** Indicates that the context is doublebuffered. */
	@Native
	static final int CAPS_DOUBLEBUFFERED = (FIRST_PRIVATE_CAP << 0);
	/**
	* Indicates the presence of the GL_ARB_fragment_shader extension.
	* This cap will only be set if the lcdshader system property has been
	* enabled and the hardware supports the minimum number of texture units
	*/
	@Native
	static final int CAPS_EXT_LCD_SHADER = (FIRST_PRIVATE_CAP << 1);
	/**
	* Indicates the presence of the GL_ARB_fragment_shader extension.
	* This cap will only be set if the biopshader system property has been
	* enabled and the hardware meets our minimum requirements.
	*/
	@Native
	static final int CAPS_EXT_BIOP_SHADER = (FIRST_PRIVATE_CAP << 2);
	/**
	* Indicates the presence of the GL_ARB_fragment_shader extension.
	* This cap will only be set if the gradshader system property has been
	* enabled and the hardware meets our minimum requirements.
	*/
	@Native
	static final int CAPS_EXT_GRAD_SHADER = (FIRST_PRIVATE_CAP << 3);
	/** Indicates the presence of the GL_ARB_texture_rectangle extension. */
	@Native
	static final int CAPS_EXT_TEXRECT = (FIRST_PRIVATE_CAP << 4);
	/** Indicates the presence of the GL_NV_texture_barrier extension. */
	@Native
	static final int CAPS_EXT_TEXBARRIER = (FIRST_PRIVATE_CAP << 5);


	OGLContextCaps(int caps, String adapterId) {
	super(caps, adapterId);
	}

	@Override
	public String toString() {
	StringBuffer buf = new StringBuffer(super.toString());
	if ((caps & CAPS_EXT_FBOBJECT) != 0) {
	buf.append("CAPS_EXT_FBOBJECT\|");
	}
	if ((caps & CAPS_STORED_ALPHA) != 0) {
	buf.append("CAPS_STORED_ALPHA\|");
	}
	if ((caps & CAPS_DOUBLEBUFFERED) != 0) {
	buf.append("CAPS_DOUBLEBUFFERED\|");
	}
	if ((caps & CAPS_EXT_LCD_SHADER) != 0) {
	buf.append("CAPS_EXT_LCD_SHADER\|");
	}
	if ((caps & CAPS_EXT_BIOP_SHADER) != 0) {
	buf.append("CAPS_BIOP_SHADER\|");
	}
	if ((caps & CAPS_EXT_GRAD_SHADER) != 0) {
	buf.append("CAPS_EXT_GRAD_SHADER\|");
	}
	if ((caps & CAPS_EXT_TEXRECT) != 0) {
	buf.append("CAPS_EXT_TEXRECT\|");
	}
	if ((caps & CAPS_EXT_TEXBARRIER) != 0) {
	buf.append("CAPS_EXT_TEXBARRIER\|");
	}
	return buf.toString();
	}
	}
	}

Back to index...