/*

 * Copyright (c) 2011, 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.

 */

#import <stdlib.h>

#import <JavaNativeFoundation/JavaNativeFoundation.h>

#import "sun_java2d_opengl_CGLSurfaceData.h"

#import "jni.h"

#import "jni_util.h"

#import "OGLRenderQueue.h"

#import "CGLGraphicsConfig.h"

#import "CGLSurfaceData.h"

#import "CGLLayer.h"

#import "ThreadUtilities.h"

/* JDK's glext.h is already included and will prevent the Apple glext.h

 * being included, so define the externs directly

 */

extern void glBindFramebufferEXT(GLenum target, GLuint framebuffer);

extern CGLError CGLTexImageIOSurface2D(

        CGLContextObj ctx, GLenum target, GLenum internal_format,

        GLsizei width, GLsizei height, GLenum format, GLenum type,

        IOSurfaceRef ioSurface, GLuint plane);

/**

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

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

 */

#pragma mark -

#pragma mark "--- Mac OS X specific methods for GL pipeline ---"

// TODO: hack that's called from OGLRenderQueue to test out unlockFocus behavior

#if 0

void

OGLSD_UnlockFocus(OGLContext *oglc, OGLSDOps *dstOps)

{

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

    CGLSDOps *cglsdo = (CGLSDOps *)dstOps->privOps;

    fprintf(stderr, "about to unlock focus: %p %p\n",

            cglsdo->peerData, ctxinfo->context);

    NSOpenGLView *nsView = cglsdo->peerData;

    if (nsView != NULL) {

JNF_COCOA_ENTER(env);

        [nsView unlockFocus];

JNF_COCOA_EXIT(env);

    }

}

#endif

/**

 * 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

CGLSD_MakeCurrentToScratch(JNIEnv *env, OGLContext *oglc)

{

    J2dTraceLn(J2D_TRACE_INFO, "CGLSD_MakeCurrentToScratch");

    if (oglc == NULL) {

        J2dRlsTraceLn(J2D_TRACE_ERROR,

                      "CGLSD_MakeCurrentToScratch: context is null");

        return JNI_FALSE;

    }

JNF_COCOA_ENTER(env);

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

#if USE_NSVIEW_FOR_SCRATCH

    [ctxinfo->context makeCurrentContext];

    [ctxinfo->context setView: ctxinfo->scratchSurface];

#else

    [ctxinfo->context clearDrawable];

    [ctxinfo->context makeCurrentContext];

    [ctxinfo->context setPixelBuffer: ctxinfo->scratchSurface

            cubeMapFace: 0

            mipMapLevel: 0

            currentVirtualScreen: [ctxinfo->context currentVirtualScreen]];

#endif

JNF_COCOA_EXIT(env);

    return JNI_TRUE;

}

/**

 * 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)

{

    J2dTraceLn(J2D_TRACE_INFO, "OGLSD_DestroyOGLSurface");

JNF_COCOA_ENTER(env);

    CGLSDOps *cglsdo = (CGLSDOps *)oglsdo->privOps;

    if (oglsdo->drawableType == OGLSD_PBUFFER) {

        if (oglsdo->textureID != 0) {

            j2d_glDeleteTextures(1, &oglsdo->textureID);

            oglsdo->textureID = 0;

        }

        if (cglsdo->pbuffer != NULL) {

            [cglsdo->pbuffer release];

            cglsdo->pbuffer = NULL;

        }

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

        // detach the NSView from the NSOpenGLContext

        CGLGraphicsConfigInfo *cglInfo = cglsdo->configInfo;

        OGLContext *oglc = cglInfo->context;

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

        [ctxinfo->context clearDrawable];

    }

    oglsdo->drawableType = OGLSD_UNDEFINED;

JNF_COCOA_EXIT(env);

}

/**

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

 * 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)

{

    J2dTraceLn(J2D_TRACE_INFO, "OGLSD_GetNativeConfigInfo");

    if (oglsdo == NULL) {

        J2dRlsTraceLn(J2D_TRACE_ERROR, "OGLSD_GetNativeConfigInfo: ops are null");

        return 0L;

    }

    CGLSDOps *cglsdo = (CGLSDOps *)oglsdo->privOps;

    if (cglsdo == NULL) {

        J2dRlsTraceLn(J2D_TRACE_ERROR, "OGLSD_GetNativeConfigInfo: cgl ops are null");

        return 0L;

    }

    return ptr_to_jlong(cglsdo->configInfo);

}

/**

 * 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)

{

    J2dTraceLn(J2D_TRACE_INFO, "OGLSD_SetScratchContext");

    CGLGraphicsConfigInfo *cglInfo = (CGLGraphicsConfigInfo *)jlong_to_ptr(pConfigInfo);

    if (cglInfo == NULL) {

        J2dRlsTraceLn(J2D_TRACE_ERROR, "OGLSD_SetScratchContext: cgl config info is null");

        return NULL;

    }

    OGLContext *oglc = cglInfo->context;

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

JNF_COCOA_ENTER(env);

    // avoid changing the context's target view whenever possible, since

    // calling setView causes flickering; as long as our context is current

    // to some view, it's not necessary to switch to the scratch surface

    if ([ctxinfo->context view] == nil) {

        // it seems to be necessary to explicitly flush between context changes

        OGLContext *currentContext = OGLRenderQueue_GetCurrentContext();

        if (currentContext != NULL) {

            j2d_glFlush();

        }

        if (!CGLSD_MakeCurrentToScratch(env, oglc)) {

            return NULL;

        }

    } else if ([NSOpenGLContext currentContext] == nil) {

        [ctxinfo->context makeCurrentContext];

    }

    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 surface (and not

        // some other framebuffer object)

        j2d_glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);

    }

JNF_COCOA_EXIT(env);

    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)

{

    J2dTraceLn(J2D_TRACE_INFO, "OGLSD_MakeOGLContextCurrent");

    CGLSDOps *dstCGLOps = (CGLSDOps *)dstOps->privOps;

    J2dTraceLn4(J2D_TRACE_VERBOSE, "  src: %d %p dst: %d %p", srcOps->drawableType, srcOps, dstOps->drawableType, dstOps);

    OGLContext *oglc = dstCGLOps->configInfo->context;

    if (oglc == NULL) {

        J2dRlsTraceLn(J2D_TRACE_ERROR, "OGLSD_MakeOGLContextCurrent: context is null");

        return NULL;

    }

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

    // it seems to be necessary to explicitly flush between context changes

    OGLContext *currentContext = OGLRenderQueue_GetCurrentContext();

    if (currentContext != NULL) {

        j2d_glFlush();

    }

    if (dstOps->drawableType == OGLSD_FBOBJECT) {

        // 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 (!CGLSD_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(GL_TEXTURE_2D, 0);

        j2d_glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, dstOps->fbobjectID);

        return oglc;

    }

JNF_COCOA_ENTER(env);

    // set the current surface

    if (dstOps->drawableType == OGLSD_PBUFFER) {

        // REMIND: pbuffers are not fully tested yet...

        [ctxinfo->context clearDrawable];

        [ctxinfo->context makeCurrentContext];

        [ctxinfo->context setPixelBuffer: dstCGLOps->pbuffer

                cubeMapFace: 0

                mipMapLevel: 0

                currentVirtualScreen: [ctxinfo->context currentVirtualScreen]];

    } else {

        CGLSDOps *cglsdo = (CGLSDOps *)dstOps->privOps;

        NSView *nsView = (NSView *)cglsdo->peerData;

        if ([ctxinfo->context view] != nsView) {

            [ctxinfo->context makeCurrentContext];

            [ctxinfo->context setView: nsView];

        }

    }

    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);

    }

    if ((srcOps != dstOps) && (srcOps->drawableType == OGLSD_PBUFFER)) {

        // bind pbuffer to the render texture object (since we are preparing

        // to copy from the pbuffer)

        CGLSDOps *srcCGLOps = (CGLSDOps *)srcOps->privOps;

        j2d_glBindTexture(GL_TEXTURE_2D, srcOps->textureID);

        [ctxinfo->context

                setTextureImageToPixelBuffer: srcCGLOps->pbuffer

                colorBuffer: GL_FRONT];

    }

JNF_COCOA_EXIT(env);

    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)

{

    J2dTraceLn(J2D_TRACE_INFO, "OGLSD_InitOGLWindow");

    if (oglsdo == NULL) {

        J2dRlsTraceLn(J2D_TRACE_ERROR, "OGLSD_InitOGLWindow: ops are null");

        return JNI_FALSE;

    }

    CGLSDOps *cglsdo = (CGLSDOps *)oglsdo->privOps;

    if (cglsdo == NULL) {

        J2dRlsTraceLn(J2D_TRACE_ERROR, "OGLSD_InitOGLWindow: cgl ops are null");

        return JNI_FALSE;

    }

    AWTView *v = cglsdo->peerData;

    if (v == NULL) {

        J2dRlsTraceLn(J2D_TRACE_ERROR, "OGLSD_InitOGLWindow: view is invalid");

        return JNI_FALSE;

    }

JNF_COCOA_ENTER(env);

    NSRect surfaceBounds = [v bounds];

    oglsdo->drawableType = OGLSD_WINDOW;

    oglsdo->isOpaque = JNI_TRUE;

    oglsdo->width = surfaceBounds.size.width;

    oglsdo->height = surfaceBounds.size.height;

JNF_COCOA_EXIT(env);

    J2dTraceLn2(J2D_TRACE_VERBOSE, "  created window: w=%d h=%d", oglsdo->width, oglsdo->height);

    return JNI_TRUE;

}

void

OGLSD_SwapBuffers(JNIEnv *env, jlong pPeerData)

{

    J2dTraceLn(J2D_TRACE_INFO, "OGLSD_SwapBuffers");

JNF_COCOA_ENTER(env);

    [[NSOpenGLContext currentContext] flushBuffer];

JNF_COCOA_EXIT(env);

}

void

OGLSD_Flush(JNIEnv *env)

{

    OGLSDOps *dstOps = OGLRenderQueue_GetCurrentDestination();

    if (dstOps != NULL) {

        CGLSDOps *dstCGLOps = (CGLSDOps *)dstOps->privOps;

        CGLLayer *layer = (CGLLayer*)dstCGLOps->layer;

        if (layer != NULL) {

            [JNFRunLoop performOnMainThreadWaiting:NO withBlock:^(){

                AWT_ASSERT_APPKIT_THREAD;

                [layer setNeedsDisplay];

#ifdef REMOTELAYER

                /* If there's a remote layer (being used for testing)

                 * then we want to have that also receive the texture.

                 * First sync. up its dimensions with that of the layer

                 * we have attached to the local window and tell it that

                 * it also needs to copy the texture.

                 */

                if (layer.remoteLayer != nil) {

                    CGLLayer* remoteLayer = layer.remoteLayer;

                    remoteLayer.target = GL_TEXTURE_2D;

                    remoteLayer.textureID = layer.textureID;

                    remoteLayer.textureWidth = layer.textureWidth;

                    remoteLayer.textureHeight = layer.textureHeight;

                    [remoteLayer setNeedsDisplay];

                }

#endif /* REMOTELAYER */

            }];

        }

    }

}

#pragma mark -

#pragma mark "--- CGLSurfaceData methods ---"

extern LockFunc        OGLSD_Lock;

extern GetRasInfoFunc  OGLSD_GetRasInfo;

extern UnlockFunc      OGLSD_Unlock;

extern DisposeFunc     OGLSD_Dispose;

JNIEXPORT void JNICALL

Java_sun_java2d_opengl_CGLSurfaceData_initOps

    (JNIEnv *env, jobject cglsd,

     jlong pConfigInfo, jlong pPeerData, jlong layerPtr,

     jint xoff, jint yoff, jboolean isOpaque)

{

    J2dTraceLn(J2D_TRACE_INFO, "CGLSurfaceData_initOps");

    J2dTraceLn1(J2D_TRACE_INFO, "  pPeerData=%p", jlong_to_ptr(pPeerData));

    J2dTraceLn2(J2D_TRACE_INFO, "  xoff=%d, yoff=%d", (int)xoff, (int)yoff);

    OGLSDOps *oglsdo = (OGLSDOps *)

        SurfaceData_InitOps(env, cglsd, sizeof(OGLSDOps));

    CGLSDOps *cglsdo = (CGLSDOps *)malloc(sizeof(CGLSDOps));

    if (cglsdo == NULL) {

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

        return;

    }

    oglsdo->privOps = cglsdo;

    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;

    oglsdo->xOffset = xoff;

    oglsdo->yOffset = yoff;

    oglsdo->isOpaque = isOpaque;

    cglsdo->peerData = (AWTView *)jlong_to_ptr(pPeerData);

    cglsdo->layer = (CGLLayer *)jlong_to_ptr(layerPtr);

    cglsdo->configInfo = (CGLGraphicsConfigInfo *)jlong_to_ptr(pConfigInfo);

    if (cglsdo->configInfo == NULL) {

        free(cglsdo);

        JNU_ThrowNullPointerException(env, "Config info is null in initOps");

    }

}

JNIEXPORT void JNICALL

Java_sun_java2d_opengl_CGLSurfaceData_clearWindow

(JNIEnv *env, jobject cglsd)

{

    J2dTraceLn(J2D_TRACE_INFO, "CGLSurfaceData_clearWindow");

    OGLSDOps *oglsdo = (OGLSDOps*) SurfaceData_GetOps(env, cglsd);

    CGLSDOps *cglsdo = (CGLSDOps*) oglsdo->privOps;

    cglsdo->peerData = NULL;

    cglsdo->layer = NULL;

}

JNIEXPORT jboolean JNICALL

Java_sun_java2d_opengl_CGLSurfaceData_initPbuffer

    (JNIEnv *env, jobject cglsd,

     jlong pData, jlong pConfigInfo, jboolean isOpaque,

     jint width, jint height)

{

    J2dTraceLn3(J2D_TRACE_INFO, "CGLSurfaceData_initPbuffer: w=%d h=%d opq=%d", width, height, isOpaque);

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

    if (oglsdo == NULL) {

        J2dRlsTraceLn(J2D_TRACE_ERROR, "CGLSurfaceData_initPbuffer: ops are null");

        return JNI_FALSE;

    }

    CGLSDOps *cglsdo = (CGLSDOps *)oglsdo->privOps;

    if (cglsdo == NULL) {

        J2dRlsTraceLn(J2D_TRACE_ERROR, "CGLSurfaceData_initPbuffer: cgl ops are null");

        return JNI_FALSE;

    }

    CGLGraphicsConfigInfo *cglInfo = (CGLGraphicsConfigInfo *)

        jlong_to_ptr(pConfigInfo);

    if (cglInfo == NULL) {

        J2dRlsTraceLn(J2D_TRACE_ERROR, "CGLSurfaceData_initPbuffer: cgl config info is null");

        return JNI_FALSE;

    }

    // find the maximum allowable texture dimensions (this value ultimately

    // determines our maximum pbuffer size)

    int pbMax = 0;

    j2d_glGetIntegerv(GL_MAX_TEXTURE_SIZE, &pbMax);

    int pbWidth = 0;

    int pbHeight = 0;

    if (OGLC_IS_CAP_PRESENT(cglInfo->context, CAPS_TEXNONPOW2)) {

        // use non-power-of-two dimensions directly

        pbWidth = (width <= pbMax) ? width : 0;

        pbHeight = (height <= pbMax) ? height : 0;

    } else {

        // find the appropriate power-of-two dimensions

        pbWidth = OGLSD_NextPowerOfTwo(width, pbMax);

        pbHeight = OGLSD_NextPowerOfTwo(height, pbMax);

    }

    J2dTraceLn3(J2D_TRACE_VERBOSE, "  desired pbuffer dimensions: w=%d h=%d max=%d", pbWidth, pbHeight, pbMax);

    // if either dimension is 0, we cannot allocate a pbuffer/texture with the

    // requested dimensions

    if (pbWidth == 0 || pbHeight == 0) {

        J2dRlsTraceLn(J2D_TRACE_ERROR, "CGLSurfaceData_initPbuffer: dimensions too large");

        return JNI_FALSE;

    }

    int format = isOpaque ? GL_RGB : GL_RGBA;

JNF_COCOA_ENTER(env);

    cglsdo->pbuffer =

        [[NSOpenGLPixelBuffer alloc]

            initWithTextureTarget: GL_TEXTURE_2D

            textureInternalFormat: format

            textureMaxMipMapLevel: 0

            pixelsWide: pbWidth

            pixelsHigh: pbHeight];

    if (cglsdo->pbuffer == nil) {

        J2dRlsTraceLn(J2D_TRACE_ERROR, "CGLSurfaceData_initPbuffer: could not create pbuffer");

        return JNI_FALSE;

    }