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/*
* Copyright 2004-2008 Sun Microsystems, Inc. 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. Sun designates this
* particular file as subject to the "Classpath" exception as provided
* by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.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.*;
/**
* 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.
*/
static final int CAPS_EXT_FBOBJECT =
(CAPS_RT_TEXTURE_ALPHA | CAPS_RT_TEXTURE_OPAQUE);
/** Indicates that the context supports a stored alpha channel. */
static final int CAPS_STORED_ALPHA = CAPS_RT_PLAIN_ALPHA;
/** Indicates that the context is doublebuffered. */
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
*/
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.
*/
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.
*/
static final int CAPS_EXT_GRAD_SHADER = (FIRST_PRIVATE_CAP << 3);
/** Indicates the presence of the GL_ARB_texture_rectangle extension. */
static final int CAPS_EXT_TEXRECT = (FIRST_PRIVATE_CAP << 4);
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|");
}
return buf.toString();
}
}
}
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