/*

 * Copyright (c) 2003, 2008, 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.

 */

#include <jlong.h>

#include "sun_java2d_opengl_GLXSurfaceData.h"

#include "OGLRenderQueue.h"

#include "GLXGraphicsConfig.h"

#include "GLXSurfaceData.h"

#include "awt_Component.h"

#include "awt_GraphicsEnv.h"

/**

 * The methods in this file implement the native windowing system specific

 * layer (GLX) for the OpenGL-based Java 2D pipeline.

 */

#ifndef HEADLESS

extern LockFunc       OGLSD_Lock;

extern GetRasInfoFunc OGLSD_GetRasInfo;

extern UnlockFunc     OGLSD_Unlock;

extern DisposeFunc    OGLSD_Dispose;

extern struct MComponentPeerIDs mComponentPeerIDs;

extern void

    OGLSD_SetNativeDimensions(JNIEnv *env, OGLSDOps *oglsdo, jint w, jint h);

jboolean surfaceCreationFailed = JNI_FALSE;

#endif /* !HEADLESS */

JNIEXPORT void JNICALL

Java_sun_java2d_opengl_GLXSurfaceData_initOps(JNIEnv *env, jobject glxsd,

                                              jobject peer, jlong aData)

{

#ifndef HEADLESS

    OGLSDOps *oglsdo = (OGLSDOps *)SurfaceData_InitOps(env, glxsd,

                                                       sizeof(OGLSDOps));

    GLXSDOps *glxsdo = (GLXSDOps *)malloc(sizeof(GLXSDOps));

    J2dTraceLn(J2D_TRACE_INFO, "GLXSurfaceData_initOps");

    if (glxsdo == NULL) {

        JNU_ThrowOutOfMemoryError(env, "creating native GLX ops");

        return;

    }

    oglsdo->privOps = glxsdo;

    oglsdo->sdOps.Lock       = OGLSD_Lock;

    oglsdo->sdOps.GetRasInfo = OGLSD_GetRasInfo;

    oglsdo->sdOps.Unlock     = OGLSD_Unlock;

    oglsdo->sdOps.Dispose    = OGLSD_Dispose;

    oglsdo->drawableType = OGLSD_UNDEFINED;

    oglsdo->activeBuffer = GL_FRONT;

    oglsdo->needsInit = JNI_TRUE;

#ifdef XAWT

    if (peer != NULL) {

        glxsdo->window = JNU_CallMethodByName(env, NULL, peer,

                                              "getContentWindow", "()J").j;

    } else {

        glxsdo->window = 0;

    }

#else

    if (peer != NULL) {

        struct ComponentData *cdata;

        cdata = (struct ComponentData *)

            JNU_GetLongFieldAsPtr(env, peer, mComponentPeerIDs.pData);

        if (cdata == NULL) {

            free(glxsdo);

            JNU_ThrowNullPointerException(env, "Component data missing");

            return;

        }

        if (cdata->widget == NULL) {

            free(glxsdo);

            JNU_ThrowInternalError(env, "Widget is NULL in initOps");

            return;

        }

        glxsdo->widget = cdata->widget;

    } else {

        glxsdo->widget = NULL;

    }

#endif

    glxsdo->configData = (AwtGraphicsConfigDataPtr)jlong_to_ptr(aData);

    if (glxsdo->configData == NULL) {

        free(glxsdo);

        JNU_ThrowNullPointerException(env,

                                 "Native GraphicsConfig data block missing");

        return;

    }

    if (glxsdo->configData->glxInfo == NULL) {

        free(glxsdo);

        JNU_ThrowNullPointerException(env, "GLXGraphicsConfigInfo missing");

        return;

    }

#endif /* HEADLESS */

}

#ifndef HEADLESS

/**

 * This function disposes of any native windowing system resources associated

 * with this surface.  For instance, if the given OGLSDOps is of type

 * OGLSD_PBUFFER, this method implementation will destroy the actual pbuffer

 * surface.

 */

void

OGLSD_DestroyOGLSurface(JNIEnv *env, OGLSDOps *oglsdo)

{

    GLXSDOps *glxsdo = (GLXSDOps *)oglsdo->privOps;

    J2dTraceLn(J2D_TRACE_INFO, "OGLSD_DestroyOGLSurface");

    if (oglsdo->drawableType == OGLSD_PBUFFER) {

        if (glxsdo->drawable != 0) {

            j2d_glXDestroyPbuffer(awt_display, glxsdo->drawable);

            glxsdo->drawable = 0;

        }

    } else if (oglsdo->drawableType == OGLSD_WINDOW) {

        // X Window is free'd later by AWT code...

    }

}

/**

 * Makes the given context current to its associated "scratch" surface.  If

 * the operation is successful, this method will return JNI_TRUE; otherwise,

 * returns JNI_FALSE.

 */

static jboolean

GLXSD_MakeCurrentToScratch(JNIEnv *env, OGLContext *oglc)

{

    GLXCtxInfo *ctxInfo;

    J2dTraceLn(J2D_TRACE_INFO, "GLXSD_MakeCurrentToScratch");

    if (oglc == NULL) {

        J2dRlsTraceLn(J2D_TRACE_ERROR,

                      "GLXSD_MakeCurrentToScratch: context is null");

        return JNI_FALSE;

    }

    ctxInfo = (GLXCtxInfo *)oglc->ctxInfo;

    if (!j2d_glXMakeContextCurrent(awt_display,

                                   ctxInfo->scratchSurface,

                                   ctxInfo->scratchSurface,

                                   ctxInfo->context))

    {

        J2dRlsTraceLn(J2D_TRACE_ERROR,

                      "GLXSD_MakeCurrentToScratch: could not make current");

        return JNI_FALSE;

    }

    return JNI_TRUE;

}

/**

 * Returns a pointer (as a jlong) to the native GLXGraphicsConfigInfo

 * associated with the given OGLSDOps.  This method can be called from

 * shared code to retrieve the native GraphicsConfig data in a platform-

 * independent manner.

 */

jlong

OGLSD_GetNativeConfigInfo(OGLSDOps *oglsdo)

{

    GLXSDOps *glxsdo;

    if (oglsdo == NULL) {

        J2dRlsTraceLn(J2D_TRACE_ERROR,

                      "OGLSD_GetNativeConfigInfo: ops are null");

        return 0L;

    }

    glxsdo = (GLXSDOps *)oglsdo->privOps;

    if (glxsdo == NULL) {

        J2dRlsTraceLn(J2D_TRACE_ERROR,

                      "OGLSD_GetNativeConfigInfo: glx ops are null");

        return 0L;

    }

    if (glxsdo->configData == NULL) {

        J2dRlsTraceLn(J2D_TRACE_ERROR,

                      "OGLSD_GetNativeConfigInfo: config data is null");

        return 0L;

    }

    return ptr_to_jlong(glxsdo->configData->glxInfo);

}

/**

 * Makes the given GraphicsConfig's context current to its associated

 * "scratch" surface.  If there is a problem making the context current,

 * this method will return NULL; otherwise, returns a pointer to the

 * OGLContext that is associated with the given GraphicsConfig.

 */

OGLContext *

OGLSD_SetScratchSurface(JNIEnv *env, jlong pConfigInfo)

{

    GLXGraphicsConfigInfo *glxInfo =

        (GLXGraphicsConfigInfo *)jlong_to_ptr(pConfigInfo);

    OGLContext *oglc;

    J2dTraceLn(J2D_TRACE_INFO, "OGLSD_SetScratchContext");

    if (glxInfo == NULL) {

        J2dRlsTraceLn(J2D_TRACE_ERROR,

                      "OGLSD_SetScratchContext: glx config info is null");

        return NULL;

    }

    oglc = glxInfo->context;

    if (!GLXSD_MakeCurrentToScratch(env, oglc)) {

        return NULL;

    }

    if (OGLC_IS_CAP_PRESENT(oglc, CAPS_EXT_FBOBJECT)) {

        // the GL_EXT_framebuffer_object extension is present, so this call

        // will ensure that we are bound to the scratch pbuffer (and not

        // some other framebuffer object)

        j2d_glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);

    }

    return oglc;

}

/**

 * Makes a context current to the given source and destination

 * surfaces.  If there is a problem making the context current, this method

 * will return NULL; otherwise, returns a pointer to the OGLContext that is

 * associated with the destination surface.

 */

OGLContext *

OGLSD_MakeOGLContextCurrent(JNIEnv *env, OGLSDOps *srcOps, OGLSDOps *dstOps)

{

    GLXSDOps *dstGLXOps = (GLXSDOps *)dstOps->privOps;

    OGLContext *oglc;

    J2dTraceLn(J2D_TRACE_INFO, "OGLSD_MakeOGLContextCurrent");

    oglc = dstGLXOps->configData->glxInfo->context;

    if (oglc == NULL) {

        J2dRlsTraceLn(J2D_TRACE_ERROR,

                      "OGLSD_MakeOGLContextCurrent: context is null");

        return NULL;

    }

    if (dstOps->drawableType == OGLSD_FBOBJECT) {

        OGLContext *currentContext = OGLRenderQueue_GetCurrentContext();

        // first make sure we have a current context (if the context isn't

        // already current to some drawable, we will make it current to

        // its scratch surface)

        if (oglc != currentContext) {

            if (!GLXSD_MakeCurrentToScratch(env, oglc)) {

                return NULL;

            }

        }

        // now bind to the fbobject associated with the destination surface;

        // this means that all rendering will go into the fbobject destination

        // (note that we unbind the currently bound texture first; this is

        // recommended procedure when binding an fbobject)

        j2d_glBindTexture(dstOps->textureTarget, 0);

        j2d_glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, dstOps->fbobjectID);

    } else {

        GLXSDOps *srcGLXOps = (GLXSDOps *)srcOps->privOps;

        GLXCtxInfo *ctxinfo = (GLXCtxInfo *)oglc->ctxInfo;

        // make the context current

        if (!j2d_glXMakeContextCurrent(awt_display,

                                       dstGLXOps->drawable,

                                       srcGLXOps->drawable,

                                       ctxinfo->context))

        {

            J2dRlsTraceLn(J2D_TRACE_ERROR,

                "OGLSD_MakeOGLContextCurrent: could not make current");

            return NULL;

        }

        if (OGLC_IS_CAP_PRESENT(oglc, CAPS_EXT_FBOBJECT)) {

            // the GL_EXT_framebuffer_object extension is present, so we

            // must bind to the default (windowing system provided)

            // framebuffer

            j2d_glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);

        }

    }

    return oglc;

}

/**

 * This function initializes a native window surface and caches the window

 * bounds in the given OGLSDOps.  Returns JNI_TRUE if the operation was

 * successful; JNI_FALSE otherwise.

 */

jboolean

OGLSD_InitOGLWindow(JNIEnv *env, OGLSDOps *oglsdo)

{

    GLXSDOps *glxsdo;

    Window window;

#ifdef XAWT

    XWindowAttributes attr;

#else

    Widget widget;

#endif

    J2dTraceLn(J2D_TRACE_INFO, "OGLSD_InitOGLWindow");

    if (oglsdo == NULL) {

        J2dRlsTraceLn(J2D_TRACE_ERROR,

                      "OGLSD_InitOGLWindow: ops are null");

        return JNI_FALSE;

    }

    glxsdo = (GLXSDOps *)oglsdo->privOps;

    if (glxsdo == NULL) {

        J2dRlsTraceLn(J2D_TRACE_ERROR,

                      "OGLSD_InitOGLWindow: glx ops are null");

        return JNI_FALSE;

    }

#ifdef XAWT

    window = glxsdo->window;

    if (window == 0) {

        J2dRlsTraceLn(J2D_TRACE_ERROR,

                      "OGLSD_InitOGLWindow: window is invalid");

        return JNI_FALSE;

    }

    XGetWindowAttributes(awt_display, window, &attr);

    oglsdo->width = attr.width;

    oglsdo->height = attr.height;

#else

    widget = glxsdo->widget;

    if (widget == NULL) {

        J2dTraceLn(J2D_TRACE_WARNING, "OGLSD_InitOGLWindow: widget is null");

    }

    if (!XtIsRealized(widget)) {

        J2dRlsTraceLn(J2D_TRACE_ERROR,

                      "OGLSD_InitOGLWindow: widget is unrealized");

        return JNI_FALSE;

    }

    window = XtWindow(widget);

    oglsdo->width = widget->core.width;

    oglsdo->height = widget->core.height;

#endif

    oglsdo->drawableType = OGLSD_WINDOW;

    oglsdo->isOpaque = JNI_TRUE;

    oglsdo->xOffset = 0;

    oglsdo->yOffset = 0;

    glxsdo->drawable = window;

    glxsdo->xdrawable = window;

    J2dTraceLn2(J2D_TRACE_VERBOSE, "  created window: w=%d h=%d",

                oglsdo->width, oglsdo->height);

    return JNI_TRUE;

}

static int

GLXSD_BadAllocXErrHandler(Display *display, XErrorEvent *xerr)

{

    int ret = 0;

    if (xerr->error_code == BadAlloc) {

        surfaceCreationFailed = JNI_TRUE;

    } else {

        ret = (*xerror_saved_handler)(display, xerr);

    }

    return ret;

}

JNIEXPORT jboolean JNICALL

Java_sun_java2d_opengl_GLXSurfaceData_initPbuffer

    (JNIEnv *env, jobject glxsd,

     jlong pData, jlong pConfigInfo,

     jboolean isOpaque,

     jint width, jint height)

{

    OGLSDOps *oglsdo = (OGLSDOps *)jlong_to_ptr(pData);

    GLXGraphicsConfigInfo *glxinfo =

        (GLXGraphicsConfigInfo *)jlong_to_ptr(pConfigInfo);

    GLXSDOps *glxsdo;

    GLXPbuffer pbuffer;

    int attrlist[] = {GLX_PBUFFER_WIDTH, 0,

                      GLX_PBUFFER_HEIGHT, 0,

                      GLX_PRESERVED_CONTENTS, GL_FALSE, 0};

    J2dTraceLn3(J2D_TRACE_INFO,

                "GLXSurfaceData_initPbuffer: w=%d h=%d opq=%d",

                width, height, isOpaque);

    if (oglsdo == NULL) {

        J2dRlsTraceLn(J2D_TRACE_ERROR,

                      "GLXSurfaceData_initPbuffer: ops are null");

        return JNI_FALSE;

    }

    glxsdo = (GLXSDOps *)oglsdo->privOps;

    if (glxsdo == NULL) {

        J2dRlsTraceLn(J2D_TRACE_ERROR,

                      "GLXSurfaceData_initPbuffer: glx ops are null");

        return JNI_FALSE;

    }

    if (glxinfo == NULL) {

        J2dRlsTraceLn(J2D_TRACE_ERROR,

                      "GLXSurfaceData_initPbuffer: glx config info is null");

        return JNI_FALSE;

    }

    attrlist[1] = width;

    attrlist[3] = height;

    surfaceCreationFailed = JNI_FALSE;

    EXEC_WITH_XERROR_HANDLER(

        GLXSD_BadAllocXErrHandler,

        pbuffer = j2d_glXCreatePbuffer(awt_display,

                                       glxinfo->fbconfig, attrlist));

    if ((pbuffer == 0) || surfaceCreationFailed) {

        J2dRlsTraceLn(J2D_TRACE_ERROR,

            "GLXSurfaceData_initPbuffer: could not create glx pbuffer");

        return JNI_FALSE;

    }

    oglsdo->drawableType = OGLSD_PBUFFER;

    oglsdo->isOpaque = isOpaque;

    oglsdo->width = width;

    oglsdo->height = height;

    oglsdo->xOffset = 0;

    oglsdo->yOffset = 0;

    glxsdo->drawable = pbuffer;

    glxsdo->xdrawable = 0;

    OGLSD_SetNativeDimensions(env, oglsdo, width, height);

    return JNI_TRUE;

}

void

OGLSD_SwapBuffers(JNIEnv *env, jlong window)

{

    J2dTraceLn(J2D_TRACE_INFO, "OGLSD_SwapBuffers");

    if (window == 0L) {

        J2dRlsTraceLn(J2D_TRACE_ERROR,

                      "OGLSD_SwapBuffers: window is null");

        return;

    }

    j2d_glXSwapBuffers(awt_display, (Window)window);

}

#endif /* !HEADLESS */