| 1 | /* Copyright (c) 2001, Stanford University
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| 2 | * All rights reserved
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| 3 | *
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| 4 | * See the file LICENSE.txt for information on redistributing this software.
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| 5 | */
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| 6 |
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| 7 | #include "cr_packfunctions.h"
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| 8 | #include "cr_error.h"
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| 9 | #include "cr_net.h"
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| 10 | #include "packspu.h"
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| 11 | #include "packspu_proto.h"
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| 12 |
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| 13 | #if 0
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| 14 |
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| 15 | void PACKSPU_APIENTRY packspu_SwapBuffers( GLint window, GLint flags )
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| 16 | {
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| 17 | GET_THREAD(thread);
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| 18 | if (pack_spu.swap)
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| 19 | {
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| 20 | crPackSwapBuffersSWAP( window, flags );
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| 21 | }
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| 22 | else
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| 23 | {
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| 24 | crPackSwapBuffers( window, flags );
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| 25 | }
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| 26 | packspuFlush( (void *) thread );
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| 27 | }
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| 28 |
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| 29 |
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| 30 | #else
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| 31 |
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| 32 | void PACKSPU_APIENTRY packspu_SwapBuffers( GLint window, GLint flags )
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| 33 | {
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| 34 | GET_THREAD(thread);
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| 35 |
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| 36 | if (pack_spu.swap)
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| 37 | {
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| 38 | crPackSwapBuffersSWAP( window, flags );
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| 39 | }
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| 40 | else
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| 41 | {
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| 42 | crPackSwapBuffers( window, flags );
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| 43 | }
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| 44 | packspuFlush( (void *) thread );
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| 45 |
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| 46 | if (!(thread->netServer.conn->actual_network))
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| 47 | {
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| 48 | /* no synchronization needed */
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| 49 | return;
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| 50 | }
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| 51 |
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| 52 | if (pack_spu.swapbuffer_sync) {
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| 53 | /* This won't block unless there has been more than 1 frame
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| 54 | * since we received a writeback acknowledgement. In the
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| 55 | * normal case there's no performance penalty for doing this
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| 56 | * (beyond the cost of packing the writeback request into the
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| 57 | * stream and receiving the reply), but it eliminates the
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| 58 | * problem of runaway rendering that can occur, eg when
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| 59 | * rendering frames consisting of a single large display list
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| 60 | * in a tight loop.
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| 61 | *
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| 62 | * Note that this is *not* the same as doing a sync after each
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| 63 | * swapbuffers, which would force a round-trip 'bubble' into
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| 64 | * the network stream under normal conditions.
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| 65 | *
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| 66 | * This is complicated because writeback in the pack spu is
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| 67 | * overridden to always set the value to zero when the
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| 68 | * reply is received, rather than decrementing it:
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| 69 | */
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| 70 | switch( thread->writeback ) {
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| 71 | case 0:
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| 72 | /* Request writeback.
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| 73 | */
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| 74 | thread->writeback = 1;
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| 75 | if (pack_spu.swap)
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| 76 | {
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| 77 | crPackWritebackSWAP( (GLint *) &thread->writeback );
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| 78 | }
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| 79 | else
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| 80 | {
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| 81 | crPackWriteback( (GLint *) &thread->writeback );
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| 82 | }
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| 83 | break;
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| 84 | case 1:
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| 85 | /* Make sure writeback from previous frame has been received.
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| 86 | */
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| 87 | while (thread->writeback)
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| 88 | {
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| 89 | crNetRecv();
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| 90 | }
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| 91 | break;
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| 92 | }
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| 93 | }
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| 94 |
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| 95 | /* want to emit a parameter here */
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| 96 | if (pack_spu.emit_GATHER_POST_SWAPBUFFERS)
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| 97 | {
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| 98 | if (pack_spu.swap)
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| 99 | crPackChromiumParameteriCRSWAP(GL_GATHER_POST_SWAPBUFFERS_CR, 1);
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| 100 | else
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| 101 | crPackChromiumParameteriCR(GL_GATHER_POST_SWAPBUFFERS_CR, 1);
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| 102 | }
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| 103 | }
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| 104 |
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| 105 | #endif
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