source: vbox/trunk/src/VBox/Additions/common/crOpenGL/pack/packspu_context.c@ 20509

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

#include "packspu.h"
#include "cr_mem.h"
#include "cr_packfunctions.h"
#include "cr_string.h"
#include "packspu_proto.h"

#define MAGIC_OFFSET 3000


/*
 * Allocate a new ThreadInfo structure, setup a connection to the
 * server, allocate/init a packer context, bind this ThreadInfo to
 * the calling thread with crSetTSD().
 * We'll always call this function at least once even if we're not
 * using threads.
 */
ThreadInfo *packspuNewThread( unsigned long id )
{
    ThreadInfo *thread;

#ifdef CHROMIUM_THREADSAFE
    crLockMutex(&_PackMutex);
#else
    CRASSERT(pack_spu.numThreads == 0);
#endif

    CRASSERT(pack_spu.numThreads < MAX_THREADS);
    thread = &(pack_spu.thread[pack_spu.numThreads]);

    thread->id = id;
    thread->currentContext = NULL;

    /* connect to the server */
    thread->netServer.name = crStrdup( pack_spu.name );
    thread->netServer.buffer_size = pack_spu.buffer_size;
    if (pack_spu.numThreads == 0) {
        packspuConnectToServer( &(thread->netServer) );
        if (!thread->netServer.conn) {
            return NULL;
        }
        pack_spu.swap = thread->netServer.conn->swap;
    }
    else {
        /* a new pthread */
        crNetNewClient(pack_spu.thread[0].netServer.conn, &(thread->netServer));
        CRASSERT(thread->netServer.conn);
    }

    /* packer setup */
    CRASSERT(thread->packer == NULL);
    thread->packer = crPackNewContext( pack_spu.swap );
    CRASSERT(thread->packer);
    crPackInitBuffer( &(thread->buffer), crNetAlloc(thread->netServer.conn),
                thread->netServer.conn->buffer_size, thread->netServer.conn->mtu );
    thread->buffer.canBarf = thread->netServer.conn->Barf ? GL_TRUE : GL_FALSE;
    crPackSetBuffer( thread->packer, &thread->buffer );
    crPackFlushFunc( thread->packer, packspuFlush );
    crPackFlushArg( thread->packer, (void *) thread );
    crPackSendHugeFunc( thread->packer, packspuHuge );
    crPackSetContext( thread->packer );

#ifdef CHROMIUM_THREADSAFE
    crSetTSD(&_PackTSD, thread);
#endif

    pack_spu.numThreads++;

#ifdef CHROMIUM_THREADSAFE
    crUnlockMutex(&_PackMutex);
#endif
    return thread;
}


GLint PACKSPU_APIENTRY
packspu_CreateContext( const char *dpyName, GLint visual, GLint shareCtx )
{
    int writeback = 1;
    GLint serverCtx = (GLint) -1;
    int slot;

#ifdef CHROMIUM_THREADSAFE
    crLockMutex(&_PackMutex);
#endif

    if (shareCtx > 0) {
        /* translate to server ctx id */
        shareCtx -= MAGIC_OFFSET;
        if (shareCtx >= 0 && shareCtx < pack_spu.numContexts) {
            shareCtx = pack_spu.context[shareCtx].serverCtx;
        }
    }

    crPackSetContext( pack_spu.thread[0].packer );

    /* Pack the command */
    if (pack_spu.swap)
        crPackCreateContextSWAP( dpyName, visual, shareCtx, &serverCtx, &writeback );
    else
        crPackCreateContext( dpyName, visual, shareCtx, &serverCtx, &writeback );

    /* Flush buffer and get return value */
    packspuFlush( &(pack_spu.thread[0]) );
    if (!(pack_spu.thread[0].netServer.conn->actual_network))
    {
        /* HUMUNGOUS HACK TO MATCH SERVER NUMBERING
         *
         * The hack exists solely to make file networking work for now.  This
         * is totally gross, but since the server expects the numbers to start
         * from 5000, we need to write them out this way.  This would be
         * marginally less gross if the numbers (500 and 5000) were maybe
         * some sort of #define'd constants somewhere so the client and the
         * server could be aware of how each other were numbering things in
         * cases like file networking where they actually
         * care. 
         *
         *  -Humper 
         *
         */
        serverCtx = 5000;
    }
    else {
        while (writeback)
            crNetRecv();

        if (pack_spu.swap) {
            serverCtx = (GLint) SWAP32(serverCtx);
        }
        if (serverCtx < 0) {
#ifdef CHROMIUM_THREADSAFE
            crUnlockMutex(&_PackMutex);
#endif
            crWarning("Failure in packspu_CreateContext");
            return -1;  /* failed */
        }
    }

    /* find an empty context slot */
    for (slot = 0; slot < pack_spu.numContexts; slot++) {
        if (!pack_spu.context[slot].clientState) {
            /* found empty slot */
            break;
        }
    }
    if (slot == pack_spu.numContexts) {
        pack_spu.numContexts++;
    }

    /* Fill in the new context info */
    /* XXX fix-up sharedCtx param here */
    pack_spu.context[slot].clientState = crStateCreateContext(NULL, visual, NULL);
    pack_spu.context[slot].serverCtx = serverCtx;

#ifdef CHROMIUM_THREADSAFE
    crUnlockMutex(&_PackMutex);
#endif

    return MAGIC_OFFSET + slot;
}


void PACKSPU_APIENTRY packspu_DestroyContext( GLint ctx )
{
    const int slot = ctx - MAGIC_OFFSET;
    ContextInfo *context;
    GET_THREAD(thread);

    CRASSERT(slot >= 0);
    CRASSERT(slot < pack_spu.numContexts);
    CRASSERT(thread);

    context = &(pack_spu.context[slot]);

    if (pack_spu.swap)
        crPackDestroyContextSWAP( context->serverCtx );
    else
        crPackDestroyContext( context->serverCtx );

    crStateDestroyContext( context->clientState );

    context->clientState = NULL;
    context->serverCtx = 0;

    if (thread->currentContext == context) {
        thread->currentContext = NULL;
        crStateMakeCurrent( NULL );
    }
}


void PACKSPU_APIENTRY packspu_MakeCurrent( GLint window, GLint nativeWindow, GLint ctx )
{
    GET_THREAD(thread);
    GLint serverCtx;
    ContextInfo *newCtx;

    if (!thread) {
        thread = packspuNewThread( crThreadID() );
    }
    CRASSERT(thread);
    CRASSERT(thread->packer);

    if (ctx) {
        const int slot = ctx - MAGIC_OFFSET;

        CRASSERT(slot >= 0);
        CRASSERT(slot < pack_spu.numContexts);

        newCtx = &pack_spu.context[slot];
        CRASSERT(newCtx->clientState);  /* verify valid */

        thread->currentContext = newCtx;

        crPackSetContext( thread->packer );
        crStateMakeCurrent( newCtx->clientState );
        serverCtx = pack_spu.context[slot].serverCtx;
    }
    else {
        thread->currentContext = NULL;
        crStateMakeCurrent( NULL );
        newCtx = NULL;
        serverCtx = 0;
    }

    if (pack_spu.swap)
        crPackMakeCurrentSWAP( window, nativeWindow, serverCtx );
    else
        crPackMakeCurrent( window, nativeWindow, serverCtx );

    {
        GET_THREAD(t);
        (void) t;
        CRASSERT(t);
    }
}