/* Copyright (c) 2001, Stanford University
 * All rights reserved
 *
 * See the file LICENSE.txt for information on redistributing this software.
 */

#include <Carbon/Carbon.h>
#include <AGL/agl.h>
#include <OpenGL/OpenGL.h>

#include <iprt/time.h>
#include <iprt/assert.h>
#include <iprt/semaphore.h>

#include <stdio.h>

#include "cr_environment.h"
#include "cr_error.h"
#include "cr_string.h"
#include "cr_mem.h"
#include "renderspu.h"

#ifdef __LP64__ /** @todo port to 64-bit darwin. */
# define renderspuSetWindowContext(w, c) \
    AssertFailed()
# define renderspuGetWindowContext(w) \
    ( (ContextInfo *) GetWRefCon( ((w)->nativeWindow ? (w)->nativeWindow : (w)->window) ) )
#else
# define renderspuSetWindowContext(w, c) \
    ( SetWRefCon( (w), (unsigned long) (c) ) )
# define renderspuGetWindowContext(w) \
    ( (ContextInfo *) GetWRefCon( ((w)->nativeWindow ? (w)->nativeWindow : (w)->window) ) )
#endif

/* Debug macros */
#ifdef DEBUG_poetzsch
#define DEBUG_MSG_POETZSCH(text) \
    printf text
#else
#define DEBUG_MSG_POETZSCH(text) \
    do {} while (0)
#endif

#define DEBUG_MSG_RESULT(result, text) \
        crDebug(text" (%d; %s:%d)", (int)(result), __FILE__, __LINE__)

#define CHECK_CARBON_RC(result, text) \
    if((result) != noErr) \
        DEBUG_MSG_RESULT(result, text);

#define CHECK_CARBON_RC_RETURN(result, text, ret) \
    if((result) != noErr) \
    { \
        DEBUG_MSG_RESULT(result, text); \
        return ret; \
    }

#define CHECK_CARBON_RC_RETURN_VOID(result, text) \
    CHECK_CARBON_RC_RETURN(result, text,)

#define CHECK_AGL_RC(result, text) \
    if(!(result)) \
    { \
        GLenum error = render_spu.ws.aglGetError(); \
        DEBUG_MSG_RESULT(result, text); \
    }

static void renderspu_SystemWindowApplyVisibleRegion(WindowInfo *window);
static void renderspu_SystemSetRootVisibleRegion(GLint cRects, GLint *pRects);

/* In some case (like compiz which doesn't provide us with clipping regions) we
 * have to make sure that *all* open OpenGL windows are clipped to the main
 * application window. This is done here when called from the event handler
 * which monitor bounding changes of the main window. */
static void crClipRootHelper(unsigned long key, void *data1, void *data2)
{
    /* The window with id zero is the base window, which isn't displayed at
     * all. So ignore it. */
    if (key > 0)
    {
        /* Fetch the actually window info & the user data */
        WindowInfo *pWin = (WindowInfo *) data1;
        /* We need to assign the context with this window */
        ContextInfo *context = renderspuGetWindowContext(pWin);
        if (context &&
            context->context)
        {
            RTSemFastMutexRequest(render_spu.syncMutex);
            GLboolean result = render_spu.ws.aglSetCurrentContext(context->context);
            CHECK_AGL_RC (result, "Render SPU (crClipRootHelper): SetCurrentContext Failed");
            if (result)
            {
                result = render_spu.ws.aglUpdateContext(context->context);
                CHECK_AGL_RC (result, "Render SPU (crClipRootHelper): UpdateContext Failed");
                /* Update the clipping region */
                renderspu_SystemWindowApplyVisibleRegion(pWin);
            }
            RTSemFastMutexRelease(render_spu.syncMutex);
            /* Make sure that the position is updated relative to the Qt main
             * view */
            renderspu_SystemWindowPosition(pWin, pWin->x, pWin->y);
        }
    }
}

/* Window event handler */
pascal OSStatus
windowEvtHndlr(EventHandlerCallRef myHandler, EventRef event, void* userData)
{
    WindowRef   window = NULL;
    OSStatus    eventResult = eventNotHandledErr;
    UInt32      class = GetEventClass (event);
    UInt32      kind = GetEventKind (event);

    /* If we aren't initialized or even deinitialized already (as on VM
     * shutdown) do nothing. */
    if (!render_spu.fInit)
        return eventNotHandledErr;

    /* Fetch the sender of the event */
    GetEventParameter(event, kEventParamDirectObject, typeWindowRef,
                      NULL, sizeof(WindowRef), NULL, &window);
    switch (class)
    {
        case kEventClassVBox:
        {
            switch (kind)
            {
                case kEventVBoxUpdateContext:
                {
#ifndef __LP64__ /** @todo port to 64-bit darwin! Need to check if this event is generated or not (it probably isn't). */
                    WindowInfo *wi1;
                    GetEventParameter(event, kEventParamUserData, typeVoidPtr,
                                      NULL, sizeof(wi1), NULL, &wi1);
                    ContextInfo *context = renderspuGetWindowContext(wi1);
                    if (context &&
                        context->context)
                    {
                        AGLContext tmpContext = render_spu.ws.aglGetCurrentContext();
                        DEBUG_MSG_POETZSCH (("kEventVBoxUpdateContext %x %x\n", wi1, context->context));
                        RTSemFastMutexRequest(render_spu.syncMutex);
                        GLboolean result = render_spu.ws.aglSetCurrentContext(context->context);
                        if (result)
                        {
                            result = render_spu.ws.aglUpdateContext(context->context);
                            CHECK_AGL_RC (result, "Render SPU (windowEvtHndlr): UpdateContext Failed");
                            renderspu_SystemWindowApplyVisibleRegion(wi1);
                            /* Reapply the last active context */
                            if (tmpContext)
                            {
                                result = render_spu.ws.aglSetCurrentContext(tmpContext);
                                CHECK_AGL_RC (result, "Render SPU (windowEvtHndlr): SetCurrentContext Failed");
                                if (result)
                                {
                                    result = render_spu.ws.aglUpdateContext(tmpContext);
                                    CHECK_AGL_RC (result, "Render SPU (windowEvtHndlr): UpdateContext Failed");
                                }
                            }
                        }
                        RTSemFastMutexRelease(render_spu.syncMutex);
                    }
                    eventResult = noErr;
#endif
                    break;
                }
                case kEventVBoxBoundsChanged:
                {
#ifndef __LP64__ /** @todo port to 64-bit darwin! Need to check if this event is generated or not (it probably isn't). */
                    HIPoint p;
                    GetEventParameter(event, kEventParamOrigin, typeHIPoint,
                                      NULL, sizeof(p), NULL, &p);
                    HISize s;
                    GetEventParameter(event, kEventParamDimensions, typeHISize,
                                      NULL, sizeof(s), NULL, &s);
                    HIRect r = CGRectMake (0, 0, s.width, s.height);
                    DEBUG_MSG_POETZSCH (("kEventVBoxBoundsChanged %f %f %f %f\n", p.x, p.y, s.width, s.height));
                    GLint l[4] = { 0,
                                   0,
                                   r.size.width,
                                   r.size.height };
                    /* Update the root window clip region */
                    renderspu_SystemSetRootVisibleRegion(1, l);
                    /* Temporary save the current active context */
                    AGLContext tmpContext = render_spu.ws.aglGetCurrentContext();
                    crHashtableWalk(render_spu.windowTable, crClipRootHelper, NULL);
                    /* Reapply the last active context */
                    if (tmpContext)
                    {
                        RTSemFastMutexRequest(render_spu.syncMutex);
                        GLboolean result = render_spu.ws.aglSetCurrentContext(tmpContext);
                        CHECK_AGL_RC (result, "Render SPU (windowEvtHndlr): SetCurrentContext Failed");
                        /* Doesn't work with DirectX; Anyway doesn't  */
/*                        if (result)*/
/*                        {*/
/*                            result = render_spu.ws.aglUpdateContext(tmpContext);*/
/*                            CHECK_AGL_RC (result, "Render SPU (windowEvtHndlr): UpdateContext Failed");*/
/*                        }*/
                        RTSemFastMutexRelease(render_spu.syncMutex);
                    }
                    eventResult = noErr;
#endif
                    break;
                }
            };
            break;
        }
        break;
    };

    return eventResult;
}

GLboolean
renderspu_SystemInitVisual(VisualInfo *visual)
{
    if(visual->visAttribs & CR_PBUFFER_BIT)
        crWarning("Render SPU (renderspu_SystemInitVisual): PBuffers not support on Darwin/AGL yet.");

    return GL_TRUE;
}

GLboolean
renderspuChoosePixelFormat(ContextInfo *context, AGLPixelFormat *pix)
{
    GLbitfield  visAttribs = context->visual->visAttribs;
    GLint       attribs[32];
    GLint       ind = 0;

#define ATTR_ADD(s)     ( attribs[ind++] = (s) )
#define ATTR_ADDV(s,v)  ( ATTR_ADD((s)), ATTR_ADD((v)) )

    CRASSERT(render_spu.ws.aglChoosePixelFormat);

    ATTR_ADD(AGL_RGBA);
/*  ATTR_ADDV(AGL_RED_SIZE, 1);
    ATTR_ADDV(AGL_GREEN_SIZE, 1);
    ATTR_ADDV(AGL_BLUE_SIZE, 1); */

/*  if( render_spu.fullscreen )*/
/*      ATTR_ADD(AGL_FULLSCREEN);*/

    if( visAttribs & CR_ALPHA_BIT )
        ATTR_ADDV(AGL_ALPHA_SIZE, 1);

    if( visAttribs & CR_DOUBLE_BIT )
        ATTR_ADD(AGL_DOUBLEBUFFER);

    if( visAttribs & CR_STEREO_BIT )
        ATTR_ADD(AGL_STEREO);

    if( visAttribs & CR_DEPTH_BIT )
        ATTR_ADDV(AGL_DEPTH_SIZE, 1);

    if( visAttribs & CR_STENCIL_BIT )
        ATTR_ADDV(AGL_STENCIL_SIZE, 1);

    if( visAttribs & CR_ACCUM_BIT ) {
        ATTR_ADDV(AGL_ACCUM_RED_SIZE, 1);
        ATTR_ADDV(AGL_ACCUM_GREEN_SIZE, 1);
        ATTR_ADDV(AGL_ACCUM_BLUE_SIZE, 1);
        if( visAttribs & CR_ALPHA_BIT )
            ATTR_ADDV(AGL_ACCUM_ALPHA_SIZE, 1);
    }

    if( visAttribs & CR_MULTISAMPLE_BIT ) {
        ATTR_ADDV(AGL_SAMPLE_BUFFERS_ARB, 1);
        ATTR_ADDV(AGL_SAMPLES_ARB, 4);
    }

    if( visAttribs & CR_OVERLAY_BIT )
        ATTR_ADDV(AGL_LEVEL, 1);

    ATTR_ADD(AGL_NONE);

    *pix = render_spu.ws.aglChoosePixelFormat( NULL, 0, attribs );

    return (*pix != NULL);
}

void
renderspuDestroyPixelFormat(ContextInfo *context, AGLPixelFormat *pix)
{
    render_spu.ws.aglDestroyPixelFormat( *pix );
    *pix = NULL;
}

GLboolean
renderspu_SystemCreateContext(VisualInfo *visual, ContextInfo *context, ContextInfo *sharedContext)
{
    AGLPixelFormat pix;

    (void) sharedContext;
    CRASSERT(visual);
    CRASSERT(context);

    context->visual = visual;

    if( !renderspuChoosePixelFormat(context, &pix) ) {
        crError( "Render SPU (renderspu_SystemCreateContext): Unable to create pixel format" );
        return GL_FALSE;
    }

    context->context = render_spu.ws.aglCreateContext( pix, NULL );
    renderspuDestroyPixelFormat( context, &pix );

    if( !context->context ) {
        crError( "Render SPU (renderspu_SystemCreateContext): Could not create rendering context" );
        return GL_FALSE;
    }

    return GL_TRUE;
}

void
renderspu_SystemDestroyContext(ContextInfo *context)
{
    if(!context)
        return;

    render_spu.ws.aglSetDrawable(context->context, NULL);
    render_spu.ws.aglSetCurrentContext(NULL);
    if(context->context)
    {
        render_spu.ws.aglDestroyContext(context->context);
        context->context = NULL;
    }

    context->visual = NULL;
}

void
renderspuFullscreen(WindowInfo *window, GLboolean fullscreen)
{
    /* Real fullscreen isn't supported by VirtualBox */
}

GLboolean
renderspuWindowAttachContext(WindowInfo *wi, WindowRef window,
                             ContextInfo *context)
{
    GLboolean result;

    if(!context || !wi)
        return render_spu.ws.aglSetCurrentContext( NULL );

/*    DEBUG_MSG_POETZSCH (("WindowAttachContext %d\n", wi->BltInfo.Base.id));*/

    /* Flush old context first */
    if (context->currentWindow->window != window)
        render_spu.self.Flush();
    /* If the window buffer name is uninitialized we have to create a new
     * dummy context. */
    if (wi->bufferName == -1)
    {
        DEBUG_MSG_POETZSCH (("WindowAttachContext: create context %d\n", wi->BltInfo.Base.id));
        /* Use the same visual bits as those in the context structure */
        AGLPixelFormat pix;
        if( !renderspuChoosePixelFormat(context, &pix) )
        {
            crError( "Render SPU (renderspuWindowAttachContext): Unable to create pixel format" );
            return GL_FALSE;
        }
        /* Create the dummy context */
        wi->dummyContext = render_spu.ws.aglCreateContext( pix, NULL );
        renderspuDestroyPixelFormat( context, &pix );
        if( !wi->dummyContext )
        {
            crError( "Render SPU (renderspuWindowAttachContext): Could not create rendering context" );
            return GL_FALSE;
        }
        AGLDrawable drawable;
#ifdef __LP64__ /** @todo port to 64-bit darwin. */
        drawable = NULL;
#else
        drawable = (AGLDrawable) GetWindowPort(window);
#endif
        /* New global buffer name */
        wi->bufferName = render_spu.currentBufferName++;
        /* Set the new buffer name to the dummy context. This enable the
         * sharing of the same hardware buffer afterwards. */
        result = render_spu.ws.aglSetInteger(wi->dummyContext, AGL_BUFFER_NAME, &wi->bufferName);
        CHECK_AGL_RC (result, "Render SPU (renderspuWindowAttachContext): SetInteger Failed");
        /* Assign the dummy context to the window */
        result = render_spu.ws.aglSetDrawable(wi->dummyContext, drawable);
        CHECK_AGL_RC (result, "Render SPU (renderspuWindowAttachContext): SetDrawable Failed");
    }

    AGLDrawable oldDrawable;
    AGLDrawable newDrawable;

    oldDrawable = render_spu.ws.aglGetDrawable(context->context);
#ifdef __LP64__ /** @todo port to 64-bit darwin. */
    newDrawable = oldDrawable;
#else
    newDrawable = (AGLDrawable) GetWindowPort(window);
#endif
    RTSemFastMutexRequest(render_spu.syncMutex);
    /* Only switch the context if the drawable has changed */
    if (oldDrawable != newDrawable)
    {
        /* Reset the current context */
        result = render_spu.ws.aglSetDrawable(context->context, NULL);
        CHECK_AGL_RC (result, "Render SPU (renderspuWindowAttachContext): SetDrawable Failed");
        /* Set the buffer name of the dummy context to the current context
         * also. After that both share the same hardware buffer. */
        render_spu.ws.aglSetInteger (context->context, AGL_BUFFER_NAME, &wi->bufferName);
        CHECK_AGL_RC (result, "Render SPU (renderspuWindowAttachContext): SetInteger Failed");
        /* Set the new drawable */
#ifdef __LP64__ /** @todo port to 64-bit darwin. */
        result = -1;
#else
        result = render_spu.ws.aglSetDrawable(context->context, newDrawable);
#endif
        CHECK_AGL_RC (result, "Render SPU (renderspuWindowAttachContext): SetDrawable Failed");
        renderspuSetWindowContext(window, context);
    }
    result = render_spu.ws.aglSetCurrentContext(context->context);
    CHECK_AGL_RC (result, "Render SPU (renderspuWindowAttachContext): SetCurrentContext Failed");
    result = render_spu.ws.aglUpdateContext(context->context);
    CHECK_AGL_RC (result, "Render SPU (renderspuWindowAttachContext): UpdateContext Failed");
    RTSemFastMutexRelease(render_spu.syncMutex);

    return result;
}

GLboolean
renderspu_SystemCreateWindow(VisualInfo *visual, GLboolean showIt,
                             WindowInfo *window)
{
    return GL_TRUE;
}

void renderspu_SystemReparentWindow(WindowInfo *)
{
    /* stub only */
}

void
renderspu_SystemDestroyWindow(WindowInfo *window)
{
    CRASSERT(window);
    CRASSERT(window->visual);

    if(!window->nativeWindow)
    {
        EventRef evt;
        OSStatus status = CreateEvent(NULL, kEventClassVBox, kEventVBoxDisposeWindow, 0, kEventAttributeNone, &evt);
        CHECK_CARBON_RC_RETURN_VOID (status, "Render SPU (renderspu_SystemDestroyWindow): CreateEvent Failed");
        status = SetEventParameter(evt, kEventParamWindowRef, typeWindowRef, sizeof (window->window), &window->window);
        CHECK_CARBON_RC_RETURN_VOID (status, "Render SPU (renderspu_SystemDestroyWindow): SetEventParameter Failed");
        status = PostEventToQueue(GetMainEventQueue(), evt, kEventPriorityStandard);
        CHECK_CARBON_RC_RETURN_VOID (status, "Render SPU (renderspu_SystemDestroyWindow): PostEventToQueue Failed");
    }

    /* Delete the dummy context */
    if(window->dummyContext)
    {
        render_spu.ws.aglSetDrawable(window->dummyContext, NULL);
        render_spu.ws.aglDestroyContext(window->dummyContext);
        window->dummyContext = NULL;
    }

    /* Reset some values */
    window->bufferName = -1;
    window->visual = NULL;
    window->window = NULL;

    if (window->hVisibleRegion)
    {
        DisposeRgn(window->hVisibleRegion);
        window->hVisibleRegion = 0;
    }
}

void
renderspu_SystemWindowPosition(WindowInfo *window,
                               GLint x, GLint y)
{
    CRASSERT(window);
    CRASSERT(window->window);

    OSStatus status = noErr;
    /* Send a event to the main thread, cause some function of Carbon aren't
     * thread safe */
    EventRef evt;
    status = CreateEvent(NULL, kEventClassVBox, kEventVBoxMoveWindow, 0, kEventAttributeNone, &evt);
    CHECK_CARBON_RC_RETURN_VOID (status, "Render SPU (renderspu_SystemWindowPosition): CreateEvent Failed");
    status = SetEventParameter(evt, kEventParamWindowRef, typeWindowRef, sizeof(window->window), &window->window);
    CHECK_CARBON_RC_RETURN_VOID (status, "Render SPU (renderspu_SystemWindowPosition): SetEventParameter Failed");
    HIPoint p = CGPointMake (x, y);
    status = SetEventParameter(evt, kEventParamOrigin, typeHIPoint, sizeof (p), &p);
    CHECK_CARBON_RC_RETURN_VOID (status, "Render SPU (renderspu_SystemWindowPosition): SetEventParameter Failed");
    status = SetEventParameter(evt, kEventParamUserData, typeVoidPtr, sizeof (window), &window);
    CHECK_CARBON_RC_RETURN_VOID (status, "Render SPU (renderspu_SystemWindowPosition): SetEventParameter Failed");
    status = PostEventToQueue(GetMainEventQueue(), evt, kEventPriorityStandard);
    CHECK_CARBON_RC_RETURN_VOID (status, "Render SPU (renderspu_SystemWindowPosition): PostEventToQueue Failed");

    /* save the new pos */
    window->x = x;
    window->y = y;
}

void
renderspu_SystemWindowSize(WindowInfo *window, GLint w, GLint h)
{
    CRASSERT(window);
    CRASSERT(window->window);

    OSStatus status = noErr;
    /* Send a event to the main thread, cause some function of Carbon aren't
     * thread safe */
    EventRef evt;
    status = CreateEvent(NULL, kEventClassVBox, kEventVBoxResizeWindow, 0, kEventAttributeNone, &evt);
    CHECK_CARBON_RC_RETURN_VOID (status, "Render SPU (renderspu_SystemWindowSize): CreateEvent Failed ");
    status = SetEventParameter(evt, kEventParamWindowRef, typeWindowRef, sizeof(window->window), &window->window);
    CHECK_CARBON_RC_RETURN_VOID (status, "Render SPU (renderspu_SystemWindowSize): SetEventParameter Failed");
    HISize s = CGSizeMake (w, h);
    status = SetEventParameter(evt, kEventParamDimensions, typeHISize, sizeof (s), &s);
    CHECK_CARBON_RC_RETURN_VOID (status, "Render SPU (renderspu_SystemWindowSize): SetEventParameter Failed");
    status = SetEventParameter(evt, kEventParamUserData, typeVoidPtr, sizeof (window), &window);
    CHECK_CARBON_RC_RETURN_VOID (status, "Render SPU (renderspu_SystemWindowSize): SetEventParameter Failed");
    status = PostEventToQueue(GetMainEventQueue(), evt, kEventPriorityStandard);
    CHECK_CARBON_RC_RETURN_VOID (status, "Render SPU (renderspu_SystemWindowSize): SendEventToEventTarget Failed");

    DEBUG_MSG_POETZSCH (("Size %d visible %d\n", window->BltInfo.Base.id, IsWindowVisible (window->window)));
    /* save the new size */
    window->BltInfo.width = w;
    window->BltInfo.height = h;
}

void
renderspu_SystemGetWindowGeometry(WindowInfo *window,
                                  GLint *x, GLint *y,
                                  GLint *w, GLint *h)
{
    CRASSERT(window);
    CRASSERT(window->window);

    OSStatus status = noErr;
    Rect r;
    status = GetWindowBounds(window->window, kWindowStructureRgn, &r);
    CHECK_CARBON_RC_RETURN_VOID (status, "Render SPU (renderspu_SystemGetWindowGeometry): GetWindowBounds Failed");

    *x = (int) r.left;
    *y = (int) r.top;
    *w = (int) (r.right - r.left);
    *h = (int) (r.bottom - r.top);
}

void
renderspu_SystemGetMaxWindowSize(WindowInfo *window,
                                 GLint *w, GLint *h)
{
    CRASSERT(window);
    CRASSERT(window->window);

    OSStatus status = noErr;
    HISize s;
#ifdef __LP64__ /** @todo port to 64-bit darwin. */
    status = -1;
#else
    status = GetWindowResizeLimits (window->window, NULL, &s);
#endif
    CHECK_CARBON_RC_RETURN_VOID (status, "Render SPU (renderspu_SystemGetMaxWindowSize): GetWindowResizeLimits Failed");

    *w = s.width;
    *h = s.height;
}

/* Either show or hide the render SPU's window. */
void
renderspu_SystemShowWindow(WindowInfo *window, GLboolean showIt)
{
    CRASSERT(window);
    CRASSERT(window->window);

    if (!IsValidWindowPtr(window->window))
        return;

    if(showIt)
    {
        /* Force moving the win to the right position before we show it */
        renderspu_SystemWindowPosition (window, window->x, window->y);
        OSStatus status = noErr;
        /* Send a event to the main thread, cause some function of Carbon
         * aren't thread safe */
        EventRef evt;
        status = CreateEvent(NULL, kEventClassVBox, kEventVBoxShowWindow, 0, kEventAttributeNone, &evt);
        CHECK_CARBON_RC_RETURN_VOID (status, "Render SPU (renderspu_SystemShowWindow): CreateEvent Failed");
        status = SetEventParameter(evt, kEventParamWindowRef, typeWindowRef, sizeof (window->window), &window->window);
        CHECK_CARBON_RC_RETURN_VOID (status, "Render SPU (renderspu_SystemShowWindow): SetEventParameter Failed");
        status = SetEventParameter(evt, kEventParamUserData, typeVoidPtr, sizeof (window), &window);
        CHECK_CARBON_RC_RETURN_VOID (status, "Render SPU (renderspu_SystemWindowShow): SetEventParameter Failed");
        //status = SendEventToEventTarget (evt, GetWindowEventTarget (HIViewGetWindow ((HIViewRef)render_spu_parent_window_id)));
        status = PostEventToQueue(GetMainEventQueue(), evt, kEventPriorityStandard);
        CHECK_CARBON_RC_RETURN_VOID (status, "Render SPU (renderspu_SystemShowWindow): PostEventToQueue Failed");
    }
    else
    {
        EventRef evt;
        OSStatus status = CreateEvent(NULL, kEventClassVBox, kEventVBoxHideWindow, 0, kEventAttributeNone, &evt);
        CHECK_CARBON_RC_RETURN_VOID (status, "Render SPU (renderspu_SystemShowWindow): CreateEvent Failed");
        status = SetEventParameter(evt, kEventParamWindowRef, typeWindowRef, sizeof (window->window), &window->window);
        CHECK_CARBON_RC_RETURN_VOID (status, "Render SPU (renderspu_SystemShowWindow): SetEventParameter Failed");
        status = PostEventToQueue(GetMainEventQueue(), evt, kEventPriorityStandard);
        CHECK_CARBON_RC_RETURN_VOID (status, "Render SPU (renderspu_SystemShowWindow): PostEventToQueue Failed");
    }
}

void renderspu_SystemVBoxPresentComposition( WindowInfo *window, const struct VBOXVR_SCR_COMPOSITOR * pCompositor, const struct VBOXVR_SCR_COMPOSITOR_ENTRY *pChangedEntry )
{
    renderspuVBoxPresentCompositionGeneric(window, pCompositor, pChangedEntry, 0, false);
}

void
renderspu_SystemMakeCurrent(WindowInfo *window, GLint nativeWindow,
                            ContextInfo *context)
{
    Boolean result;
/*    DEBUG_MSG_POETZSCH (("makecurrent %d: \n", window->BltInfo.Base.id));*/

    CRASSERT(render_spu.ws.aglSetCurrentContext);
    //crDebug( "renderspu_SystemMakeCurrent( %x, %i, %x )", window, nativeWindow, context );

    nativeWindow = 0;

    if(window && context)
    {
        CRASSERT(window->window);
        CRASSERT(context->context);

        if(window->visual != context->visual)
        {
            crDebug("Render SPU (renderspu_SystemMakeCurrent): MakeCurrent visual mismatch (0x%x != 0x%x); remaking window.",
                    (uint)window->visual->visAttribs, (uint)context->visual->visAttribs);
            /*
             * XXX have to revisit this issue!!!
             *
             * But for now we destroy the current window
             * and re-create it with the context's visual abilities
             */
            renderspu_SystemDestroyWindow(window);
            renderspu_SystemCreateWindow(context->visual, window->visible,
                                         window);
        }

        /* This is the normal case: rendering to the render SPU's own window */
        result = renderspuWindowAttachContext(window, window->window,
                                              context);
        /* XXX this is a total hack to work around an NVIDIA driver bug */
        if(render_spu.self.GetFloatv && context->haveWindowPosARB)
        {
            GLfloat f[4];
            render_spu.self.GetFloatv(GL_CURRENT_RASTER_POSITION, f);
            if (!window->everCurrent || f[1] < 0.0)
            {
                crDebug("Render SPU (renderspu_SystemMakeCurrent): Resetting raster pos");
                render_spu.self.WindowPos2iARB(0, 0);
            }
        }
        /* Reapply the visible regions */
        renderspu_SystemWindowApplyVisibleRegion(window);
    }
    else
        renderspuWindowAttachContext (0, 0, 0);
}

void
renderspu_SystemSwapBuffers(WindowInfo *window, GLint flags)
{
    CRASSERT(window);
    CRASSERT(window->window);

    ContextInfo *context = renderspuGetWindowContext(window);

    if(!context)
        crError("Render SPU (renderspu_SystemSwapBuffers): SwapBuffers got a null context from the window");

    RTSemFastMutexRequest(render_spu.syncMutex);
//    DEBUG_MSG_POETZSCH (("Swapped %d context %x visible: %d\n", window->BltInfo.Base.id, context->context, IsWindowVisible (window->window)));
    if (context->visual &&
        context->visual->visAttribs & CR_DOUBLE_BIT)
        render_spu.ws.aglSwapBuffers(context->context);
    else
        glFlush();
    RTSemFastMutexRelease(render_spu.syncMutex);

    /* This method seems called very often. To prevent the dock using all free
     * resources we update the dock only two times per second. */
    uint64_t curTS = RTTimeMilliTS();
    if ((curTS - render_spu.uiDockUpdateTS) > 500)
    {
        OSStatus status = noErr;
        /* Send a event to the main thread, cause some function of Carbon aren't
         * thread safe */
        EventRef evt;
        status = CreateEvent(NULL, kEventClassVBox, kEventVBoxUpdateDock, 0, kEventAttributeNone, &evt);
        CHECK_CARBON_RC_RETURN_VOID (status, "Render SPU (renderspu_SystemSwapBuffers): CreateEvent Failed");
        status = PostEventToQueue(GetMainEventQueue(), evt, kEventPriorityStandard);
        CHECK_CARBON_RC_RETURN_VOID (status, "Render SPU (renderspu_SystemSwapBuffers): PostEventToQueue Failed");

        render_spu.uiDockUpdateTS = curTS;
    }
}

GLboolean renderspu_SystemWindowNeedEmptyPresent(WindowInfo *window)
{
    return GL_FALSE;
}

void renderspu_SystemWindowVisibleRegion(WindowInfo *window, GLint cRects, const GLint* pRects)
{
    CRASSERT(window);
    CRASSERT(window->window);

    /* Remember any additional clipping stuff e.g. seamless regions */
    if (window->hVisibleRegion)
    {
        DisposeRgn(window->hVisibleRegion);
        window->hVisibleRegion = 0;
    }

    if (cRects>0)
    {
        int i;
        /* Create some temporary regions */
        RgnHandle rgn = NewRgn();
        SetEmptyRgn (rgn);
        RgnHandle tmpRgn = NewRgn();
        for (i=0; i<cRects; ++i)
        {
            SetRectRgn (tmpRgn,
                        pRects[4*i]  , pRects[4*i+1],
                        pRects[4*i+2], pRects[4*i+3]);
            //DEBUG_MSG_POETZSCH (("visible rect %d %d %d %d\n", pRects[4*i]  , pRects[4*i+1],
            //                     pRects[4*i+2], pRects[4*i+3]));
            UnionRgn (rgn, tmpRgn, rgn);
        }
        DisposeRgn (tmpRgn);
        window->hVisibleRegion = rgn;
    }

    renderspu_SystemWindowApplyVisibleRegion(window);
}

static void renderspu_SystemSetRootVisibleRegion(GLint cRects, GLint *pRects)
{
    /* Remember the visible region of the root window if there is one */
    if (render_spu.hRootVisibleRegion)
    {
        DisposeRgn(render_spu.hRootVisibleRegion);
        render_spu.hRootVisibleRegion = 0;
    }

    if (cRects>0)
    {
        int i;
        render_spu.hRootVisibleRegion = NewRgn();
        SetEmptyRgn (render_spu.hRootVisibleRegion);
        RgnHandle tmpRgn = NewRgn();
        for (i=0; i<cRects; ++i)
        {
            SetRectRgn (tmpRgn,
                        pRects[4*i]  , pRects[4*i+1],
                        pRects[4*i+2], pRects[4*i+3]);
            UnionRgn (render_spu.hRootVisibleRegion, tmpRgn, render_spu.hRootVisibleRegion);
        }
        DisposeRgn (tmpRgn);
    }
}

/*Assumes that all regions are in the guest coordinates system*/
static void renderspu_SystemWindowApplyVisibleRegion(WindowInfo *window)
{
    ContextInfo *c = renderspuGetWindowContext(window);
    RgnHandle rgn;
    GLboolean result = true;

    DEBUG_MSG_POETZSCH (("ApplyVisibleRegion %x\n", window));

    if (!c || !c->context) return;

    rgn = NewRgn();
    SetEmptyRgn(rgn);

    if (render_spu.hRootVisibleRegion)
    {
        /* The render_spu.hRootVisibleRegion has coordinates from the root
         * window. We intersect it with the rect of the OpenGL window we
         * currently process. */
        SetRectRgn(rgn,
                   window->x, window->y,
                   window->x + window->BltInfo.width,
                   window->y + window->BltInfo.height);
        SectRgn(render_spu.hRootVisibleRegion, rgn, rgn);
        /* Because the clipping is done in the coordinate space of the OpenGL
         * window we have to remove the x/y position from the newly created
         * region. */
        OffsetRgn (rgn, -window->x, -window->y);
    }
    else
    {
        /* If there is not root clipping region is available, create a base
         * region with the size of the target window. This covers all
         * needed/possible space. */
        SetRectRgn(rgn, 0, 0, window->BltInfo.width, window->BltInfo.height);
    }

    /* Now intersect the window clipping region with a additional region e.g.
     * for the seamless mode. */
    if (window->hVisibleRegion)
        SectRgn(rgn, window->hVisibleRegion, rgn);

    if (rgn && !EmptyRgn(rgn))
    {
        /* Set the clip region to the context */
        result = render_spu.ws.aglSetInteger(c->context, AGL_CLIP_REGION, (const GLint*)rgn);
        CHECK_AGL_RC (result, "Render SPU (renderspu_SystemWindowVisibleRegion): SetInteger Failed");
        result = render_spu.ws.aglEnable(c->context, AGL_CLIP_REGION);
        CHECK_AGL_RC (result, "Render SPU (renderspu_SystemWindowVisibleRegion): Enable Failed");
    }
    /* Clear the region structure */
    DisposeRgn (rgn);
}

GLboolean
renderspu_SystemVBoxCreateWindow(VisualInfo *visual, GLboolean showIt,
                                 WindowInfo *window)
{
    CRASSERT(visual);
    CRASSERT(window);

    WindowAttributes winAttr = kWindowNoShadowAttribute | kWindowCompositingAttribute | kWindowIgnoreClicksAttribute | kWindowStandardHandlerAttribute | kWindowLiveResizeAttribute;
    WindowClass winClass = kOverlayWindowClass;
    Rect windowRect;
    OSStatus status = noErr;

    window->visual = visual;
    window->nativeWindow = NULL;

    if(window->window && IsValidWindowPtr(window->window))
    {
        EventRef evt;
        status = CreateEvent(NULL, kEventClassVBox, kEventVBoxDisposeWindow, 0, kEventAttributeNone, &evt);
        CHECK_CARBON_RC_RETURN (status, "Render SPU (renderspu_SystemVBoxCreateWindow): CreateEvent Failed", false);
        status = SetEventParameter(evt, kEventParamWindowRef, typeWindowRef, sizeof (window->window), &window->window);
        CHECK_CARBON_RC_RETURN (status, "Render SPU (renderspu_SystemVBoxCreateWindow): SetEventParameter Failed", false);
        status = PostEventToQueue(GetMainEventQueue(), evt, kEventPriorityStandard);
        CHECK_CARBON_RC_RETURN (status, "Render SPU (renderspu_SystemVBoxCreateWindow): PostEventToQueue Failed", false);
    }

    windowRect.left = window->x;
    windowRect.top = window->y;
    windowRect.right = window->x + window->BltInfo.width;
    windowRect.bottom = window->y + window->BltInfo.height;

    status = CreateNewWindow(winClass, winAttr, &windowRect, &window->window);
    CHECK_CARBON_RC_RETURN (status, "Render SPU (renderspu_SystemVBoxCreateWindow): CreateNewWindow Failed", GL_FALSE);

    /* We set a title for debugging purposes */
    CFStringRef title_string;
    title_string = CFStringCreateWithCStringNoCopy(NULL, window->title,
                                                   kCFStringEncodingMacRoman, NULL);
    SetWindowTitleWithCFString(window->BltInfo.window, title_string);
    CFRelease(title_string);

    /* The parent has to be in its own group */
    WindowRef parent = NULL;
    if (render_spu_parent_window_id)
    {
        parent = HIViewGetWindow ((HIViewRef)render_spu_parent_window_id);
        SetWindowGroup (parent, render_spu.pParentGroup);

    }

    /* Add the new window to the master group */
    SetWindowGroup(window->window, render_spu.pMasterGroup);

    /* This will be initialized on the first attempt to attach the global
     * context to this new window */
    window->bufferName = -1;
    window->dummyContext = NULL;
    window->hVisibleRegion = 0;

    if(showIt)
        renderspu_SystemShowWindow(window, GL_TRUE);

    crDebug("Render SPU (renderspu_SystemVBoxCreateWindow): actual window (x, y, width, height): %d, %d, %d, %d",
            window->x, window->y, window->BltInfo.width, window->BltInfo.height);

    return GL_TRUE;
}

int renderspu_SystemInit()
{
    return VINF_SUCCESS;
}

int renderspu_SystemTerm()
{
    return VINF_SUCCESS;
}

void renderspu_SystemDefaultSharedContextChanged(ContextInfo *fromContext, ContextInfo *toContext)
{

}