pack_buffer.c@ 76384

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GuestHost/OpenGL: scm updates
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1	/* Copyright (c) 2001, Stanford University
2	* All rights reserved
3	*
4	* See the file LICENSE.txt for information on redistributing this software.
5	*/
6
7	#include "cr_mem.h"
8	#include "cr_string.h"
9	#include "packer.h"
10	#include "cr_error.h"
11	#include "cr_protocol.h"
12	#ifndef IN_RING0
13	#include "cr_unpack.h"
14	#endif
15
16	#ifndef IN_RING0
17	void crWriteUnalignedDouble( void *buffer, double d )
18	{
19	unsigned int ui = (unsigned int ) buffer;
20	ui[0] = ((unsigned int *) &d)[0];
21	ui[1] = ((unsigned int *) &d)[1];
22	}
23
24	void crWriteSwappedDouble( void *buffer, double d )
25	{
26	unsigned int ui = (unsigned int ) buffer;
27	ui[0] = SWAP32(((unsigned int *) &d)[1]);
28	ui[1] = SWAP32(((unsigned int *) &d)[0]);
29	}
30
31	double crReadUnalignedDouble( const void *buffer )
32	{
33	const unsigned int ui = (unsigned int ) buffer;
34	double d;
35	((unsigned int *) &d)[0] = ui[0];
36	((unsigned int *) &d)[1] = ui[1];
37	return d;
38	}
39	#endif
40	/*
41	* We need the packer to run as efficiently as possible. To avoid one
42	* pointer dereference from the CRPackContext to the current CRPackBuffer,
43	* we keep a _copy_ of the current CRPackBuffer in the CRPackContext and
44	* operate on the fields in CRPackContext, rather than the CRPackBuffer.
45	*
46	* To keep things in sync, when we change a context's
47	* buffer, we have to use the crPackSet/GetBuffer() functions.
48	*/
49
50	void crPackSetBuffer( CRPackContext pc, CRPackBuffer buffer )
51	{
52	CRASSERT( pc );
53	CRASSERT( buffer );
54
55	if (pc->currentBuffer == buffer)
56	return; /* re-bind is no-op */
57
58	if (pc->currentBuffer) {
59	/* Another buffer currently bound to this packer (shouldn't normally occur)
60	* Release it. Fixes Ensight issue.
61	*/
62	crPackReleaseBuffer(pc);
63	}
64
65	CRASSERT( pc->currentBuffer == NULL); /* release if NULL? */
66	CRASSERT( buffer->context == NULL );
67
68	/* bind context to buffer */
69	pc->currentBuffer = buffer;
70	buffer->context = pc;
71
72	/* update the context's packing fields with those from the buffer */
73	pc->buffer = buffer; / struct copy */
74	}
75
76	#ifndef IN_RING0
77	/* This is useful for debugging packer problems */
78	void crPackSetBufferDEBUG( const char file, int line, CRPackContext pc, CRPackBuffer *buffer)
79
80	{
81	crPackSetBuffer( pc, buffer );
82	/* record debugging info */
83	pc->file = crStrdup(file);
84	pc->line = line;
85	}
86	#endif
87
88	/*
89	* Release the buffer currently attached to the context.
90	* Update/resync data structures.
91	*/
92	void crPackReleaseBuffer( CRPackContext *pc )
93	{
94	CRPackBuffer *buf;
95	CRASSERT( pc );
96
97	if (!pc->currentBuffer) {
98	crWarning("crPackReleaseBuffer called with no current buffer");
99	return; /* nothing to do */
100	}
101
102	CRASSERT( pc->currentBuffer->context == pc );
103
104	/* buffer to release */
105	buf = pc->currentBuffer;
106
107	/* copy context's fields back into the buffer to update it */
108	buf = pc->buffer; / struct copy */
109
110	/* unbind buffer from context */
111	buf->context = NULL;
112	pc->currentBuffer = NULL;
113
114	/* zero-out context's packing fields just to be safe */
115	crMemZero(&(pc->buffer), sizeof(pc->buffer));
116
117	/* update the debugging fields */
118	if (pc->file)
119	crFree(pc->file);
120	pc->file = NULL;
121	pc->line = -1;
122	}
123
124	void crPackFlushFunc( CRPackContext *pc, CRPackFlushFunc ff )
125	{
126	pc->Flush = ff;
127	}
128
129	void crPackFlushArg( CRPackContext pc, void flush_arg )
130	{
131	pc->flush_arg = flush_arg;
132	}
133
134	void crPackSendHugeFunc( CRPackContext *pc, CRPackSendHugeFunc shf )
135	{
136	pc->SendHuge = shf;
137	}
138
139	/*
140	* This basically resets the buffer attached to <pc> to the default, empty
141	* state.
142	*/
143	void crPackResetPointers( CRPackContext *pc )
144	{
145	const GLboolean geom_only = pc->buffer.geometry_only; /* save this flag */
146	const GLboolean holds_BeginEnd = pc->buffer.holds_BeginEnd;
147	const GLboolean in_BeginEnd = pc->buffer.in_BeginEnd;
148	const GLboolean canBarf = pc->buffer.canBarf;
149	CRPackBuffer *buf = pc->currentBuffer;
150	CRASSERT(buf);
151	crPackInitBuffer( buf, buf->pack, buf->size, buf->mtu
152	#ifdef IN_RING0
153	, 0
154	#endif
155	);
156	pc->buffer.geometry_only = geom_only; /* restore the flag */
157	pc->buffer.holds_BeginEnd = holds_BeginEnd;
158	pc->buffer.in_BeginEnd = in_BeginEnd;
159	pc->buffer.canBarf = canBarf;
160	}
161
162
163	/**
164	* Return max number of opcodes that'll fit in the given buffer size.
165	* Each opcode has at least a 1-word payload, so opcodes can occupy at most
166	* 20% of the space.
167	*/
168	int
169	crPackMaxOpcodes( int buffer_size )
170	{
171	int n = ( buffer_size - sizeof(CRMessageOpcodes) ) / 5;
172	/* Don't forget to add one here in case the buffer size is not
173	* divisible by 4. Thanks to Ken Moreland for finding this.
174	*/
175	n++;
176	/* round up to multiple of 4 */
177	n = (n + 0x3) & (~0x3);
178	return n;
179	}
180
181
182	/**
183	* Return max number of data bytes that'll fit in the given buffer size.
184	*/
185	int
186	crPackMaxData( int buffer_size )
187	{
188	int n = buffer_size - sizeof(CRMessageOpcodes);
189	n -= crPackMaxOpcodes(buffer_size);
190	return n;
191	}
192
193
194	/**
195	* Initialize the given CRPackBuffer object.
196	* The buffer may or may not be currently bound to a CRPackContext.
197	*
198	* Opcodes and operands are packed into a buffer in a special way.
199	* Opcodes start at opcode_start and go downward in memory while operands
200	* start at data_start and go upward in memory. The buffer is full when we
201	* either run out of opcode space or operand space.
202	*
203	* Diagram (memory addresses increase upward):
204	*
205	* data_end -> \| \| <- buf->pack + buf->size
206	* +---------+
207	* \| \|
208	* \| \|
209	* \| operands\|
210	* \| \|
211	* \| \|
212	* data_start -> +---------+
213	* opcode_start -> \| \|
214	* \| \|
215	* \| opcodes \|
216	* \| \|
217	* \| \|
218	* opcode_end -> +---------+ <- buf->pack
219	*
220	* \param buf the CRPackBuffer to initialize
221	* \param pack the address of the buffer for packing opcodes/operands.
222	* \param size size of the buffer, in bytes
223	* \param mtu max transmission unit size, in bytes. When the buffer
224	* has 'mtu' bytes in it, we have to send it. The MTU might
225	* be somewhat smaller than the buffer size.
226	*/
227	void crPackInitBuffer( CRPackBuffer buf, void pack, int size, int mtu
228	#ifdef IN_RING0
229	, unsigned int num_opcodes
230	#endif
231	)
232	{
233	#ifndef IN_RING0
234	unsigned int num_opcodes;
235	#endif
236
237	CRASSERT(mtu <= size);
238
239	buf->size = size;
240	buf->mtu = mtu;
241	buf->pack = pack;
242
243	#ifdef IN_RING0
244	if(num_opcodes)
245	{
246	num_opcodes = (num_opcodes + 0x3) & (~0x3);
247	}
248	else
249	#endif
250	{
251	num_opcodes = crPackMaxOpcodes( buf->size );
252	}
253
254	buf->data_start =
255	(unsigned char *) buf->pack + num_opcodes + sizeof(CRMessageOpcodes);
256	buf->data_current = buf->data_start;
257	buf->data_end = (unsigned char *) buf->pack + buf->size;
258
259	buf->opcode_start = buf->data_start - 1;
260	buf->opcode_current = buf->opcode_start;
261	buf->opcode_end = buf->opcode_start - num_opcodes;
262
263	buf->geometry_only = GL_FALSE;
264	buf->holds_BeginEnd = GL_FALSE;
265	buf->in_BeginEnd = GL_FALSE;
266	buf->canBarf = GL_FALSE;
267
268	if (buf->context) {
269	/* Also reset context's packing fields */
270	CRPackContext *pc = buf->context;
271	CRASSERT(pc->currentBuffer == buf);
272	/crMemcpy( &(pc->buffer), buf, sizeof(buf) );*/
273	pc->buffer = *buf;
274	}
275	}
276
277
278	int crPackCanHoldBuffer( CR_PACKER_CONTEXT_ARGDECL const CRPackBuffer *src )
279	{
280	const int num_data = crPackNumData(src);
281	const int num_opcode = crPackNumOpcodes(src);
282	int res;
283	CR_GET_PACKER_CONTEXT(pc);
284	CR_LOCK_PACKER_CONTEXT(pc);
285	res = crPackCanHoldOpcode( pc, num_opcode, num_data );
286	CR_UNLOCK_PACKER_CONTEXT(pc);
287	return res;
288	}
289
290
291	int crPackCanHoldBoundedBuffer( CR_PACKER_CONTEXT_ARGDECL const CRPackBuffer *src )
292	{
293	const int len_aligned = (src->data_current - src->opcode_current - 1 + 3) & ~3;
294	CR_GET_PACKER_CONTEXT(pc);
295	/* 24 is the size of the bounds-info packet... */
296	return crPackCanHoldOpcode( pc, 1, len_aligned + 24 );
297	}
298
299	void crPackAppendBuffer( CR_PACKER_CONTEXT_ARGDECL const CRPackBuffer *src )
300	{
301	CR_GET_PACKER_CONTEXT(pc);
302	const int num_data = crPackNumData(src);
303	const int num_opcode = crPackNumOpcodes(src);
304
305	CRASSERT(num_data >= 0);
306	CRASSERT(num_opcode >= 0);
307
308	CR_LOCK_PACKER_CONTEXT(pc);
309
310	/* don't append onto ourself! */
311	CRASSERT(pc->currentBuffer);
312	CRASSERT(pc->currentBuffer != src);
313
314	if (!crPackCanHoldBuffer(CR_PACKER_CONTEXT_ARG src))
315	{
316	if (src->holds_BeginEnd)
317	{
318	crWarning( "crPackAppendBuffer: overflowed the destination!" );
319	CR_UNLOCK_PACKER_CONTEXT(pc);
320	return;
321	}
322	else
323	{
324	crError( "crPackAppendBuffer: overflowed the destination!" );
325	CR_UNLOCK_PACKER_CONTEXT(pc);
326	}
327	}
328
329	/* Copy the buffer data/operands which are at the head of the buffer */
330	crMemcpy( pc->buffer.data_current, src->data_start, num_data );
331	pc->buffer.data_current += num_data;
332
333	/* Copy the buffer opcodes which are at the tail of the buffer */
334	CRASSERT( pc->buffer.opcode_current - num_opcode >= pc->buffer.opcode_end );
335	crMemcpy( pc->buffer.opcode_current + 1 - num_opcode, src->opcode_current + 1,
336	num_opcode );
337	pc->buffer.opcode_current -= num_opcode;
338	pc->buffer.holds_BeginEnd \|= src->holds_BeginEnd;
339	pc->buffer.in_BeginEnd = src->in_BeginEnd;
340	pc->buffer.holds_List \|= src->holds_List;
341	CR_UNLOCK_PACKER_CONTEXT(pc);
342	}
343
344
345	void
346	crPackAppendBoundedBuffer( CR_PACKER_CONTEXT_ARGDECL const CRPackBuffer src, const CRrecti bounds )
347	{
348	CR_GET_PACKER_CONTEXT(pc);
349	const GLbyte payload = (const GLbyte ) src->opcode_current + 1;
350	const int num_opcodes = crPackNumOpcodes(src);
351	const int length = src->data_current - src->opcode_current - 1;
352
353	CRASSERT(pc);
354	CR_LOCK_PACKER_CONTEXT(pc);
355	CRASSERT(pc->currentBuffer);
356	CRASSERT(pc->currentBuffer != src);
357
358	/*
359	* payload points to the block of opcodes immediately followed by operands.
360	*/
361
362	if ( !crPackCanHoldBoundedBuffer( CR_PACKER_CONTEXT_ARG src ) )
363	{
364	if (src->holds_BeginEnd)
365	{
366	crWarning( "crPackAppendBoundedBuffer: overflowed the destination!" );
367	CR_UNLOCK_PACKER_CONTEXT(pc);
368	return;
369	}
370	else
371	{
372	crError( "crPackAppendBoundedBuffer: overflowed the destination!" );
373	CR_UNLOCK_PACKER_CONTEXT(pc);
374	}
375	}
376
377	if (pc->swapping)
378	crPackBoundsInfoCRSWAP( CR_PACKER_CONTEXT_ARG bounds, payload, length, num_opcodes );
379	else
380	crPackBoundsInfoCR( CR_PACKER_CONTEXT_ARG bounds, payload, length, num_opcodes );
381
382	pc->buffer.holds_BeginEnd \|= src->holds_BeginEnd;
383	pc->buffer.in_BeginEnd = src->in_BeginEnd;
384	pc->buffer.holds_List \|= src->holds_List;
385	CR_UNLOCK_PACKER_CONTEXT(pc);
386	}
387
388
389	#ifndef CHROMIUM_THREADSAFE
390	static unsigned char *sanityCheckPointer = NULL;
391	#endif
392
393
394	/*
395	* Allocate space for a command that might be very large, such as
396	* glTexImage2D or glBufferDataARB call.
397	* The command buffer _MUST_ then be transmitted by calling crHugePacket.
398	*/
399	void *crPackAlloc( CR_PACKER_CONTEXT_ARGDECL unsigned int size )
400	{
401	CR_GET_PACKER_CONTEXT(pc);
402	unsigned char *data_ptr;
403
404	/* include space for the length and make the payload word-aligned */
405	size = ( size + sizeof(unsigned int) + 0x3 ) & ~0x3;
406
407	CR_LOCK_PACKER_CONTEXT(pc);
408
409	if ( crPackCanHoldOpcode( pc, 1, size ) )
410	{
411	/* we can just put it in the current buffer */
412	CR_GET_BUFFERED_POINTER_NOLOCK(pc, size ); /* NOTE: this sets data_ptr */
413	}
414	else
415	{
416	/* Okay, it didn't fit. Maybe it will after we flush. */
417	CR_UNLOCK_PACKER_CONTEXT(pc);
418	pc->Flush( pc->flush_arg );
419	CR_LOCK_PACKER_CONTEXT(pc);
420	if ( crPackCanHoldOpcode( pc, 1, size ) )
421	{
422	CR_GET_BUFFERED_POINTER_NOLOCK(pc, size ); /* NOTE: this sets data_ptr */
423	}
424	else
425	{
426	/* It's really way too big, so allocate a temporary packet
427	* with space for the single opcode plus the payload &
428	* header.
429	*/
430	data_ptr = (unsigned char *)
431	crAlloc( sizeof(CRMessageOpcodes) + 4 + size );
432
433	/* skip the header & opcode space */
434	data_ptr += sizeof(CRMessageOpcodes) + 4;
435	}
436	}
437
438	/* At the top of the function, we added four to the request size and
439	* rounded it up to the next multiple of four.
440	*
441	* At this point, we have:
442	*
443	* HIGH MEM \| byte size - 1 \| \
444	* ... \|
445	* ... \| - original 'size' bytes for data
446	* \| operand data \| \|
447	* return value -> \| operand data \| /
448	* \| byte 3 \| \
449	* \| byte 2 \| \|- These bytes will store 'size'
450	* \| byte 1 \| \|
451	* data_ptr -> \| byte 0 \| /
452	* \| CR opcode \| <- Set in packspuHuge()
453	* \| unused \|
454	* \| unused \|
455	* \| unused \|
456	* \| CRMessageOpcodes \|
457	* \| CRMessageOpcodes \|
458	* ...
459	* \| CRMessageOpcodes \|
460	* \| CRMessageOpcodes \|
461	* LOW MEM +------------------+
462	*/
463
464	if (pc->swapping)
465	{
466	((unsigned int ) data_ptr) = SWAP32(size);
467	crDebug( "Just swapped the length, putting %d on the wire!", ((unsigned int ) data_ptr));
468	}
469	else
470	{
471	((unsigned int ) data_ptr) = size;
472	}
473	#ifndef CHROMIUM_THREADSAFE
474	sanityCheckPointer = data_ptr + 4;
475	#endif
476	return data_ptr + 4;
477	}
478
479	#define IS_BUFFERED( packet ) \
480	((unsigned char *) (packet) >= pc->buffer.data_start && \
481	(unsigned char *) (packet) < pc->buffer.data_end)
482
483
484	/*
485	* Transmit a packet which was allocated with crPackAlloc.
486	*/
487	void crHugePacket( CR_PACKER_CONTEXT_ARGDECL CROpcode opcode, void *packet )
488	{
489	CR_GET_PACKER_CONTEXT(pc);
490	#ifndef CHROMIUM_THREADSAFE
491	CRASSERT(sanityCheckPointer == packet);
492	sanityCheckPointer = NULL;
493	#endif
494
495	if ( IS_BUFFERED( packet ) )
496	WRITE_OPCODE( pc, opcode );
497	else
498	pc->SendHuge( opcode, packet );
499	}
500
501	void crPackFree( CR_PACKER_CONTEXT_ARGDECL void *packet )
502	{
503	CR_GET_PACKER_CONTEXT(pc);
504
505	if ( IS_BUFFERED( packet ) )
506	{
507	CR_UNLOCK_PACKER_CONTEXT(pc);
508	return;
509	}
510
511	CR_UNLOCK_PACKER_CONTEXT(pc);
512
513	/* the pointer passed in doesn't include the space for the single
514	* opcode (4 bytes because of the alignment requirement) or the
515	* length field or the header */
516	crFree( (unsigned char *) packet - 8 - sizeof(CRMessageOpcodes) );
517	}
518
519	void crNetworkPointerWrite( CRNetworkPointer dst, void src )
520	{
521	/* init CRNetworkPointer with invalid values */
522	dst->ptrAlign[0] = 0xDeadBeef;
523	dst->ptrAlign[1] = 0xCafeBabe;
524	/* copy the pointer's value into the CRNetworkPointer */
525	crMemcpy( dst, &src, sizeof(src) );
526
527	/* if either assertion fails, it probably means that a packer function
528	* (which returns a value) was called without setting up the writeback
529	* pointer, or something like that.
530	*/
531	CRASSERT(dst->ptrAlign[0] != 0xffffffff);
532	CRASSERT(dst->ptrAlign[0] != 0xDeadBeef);
533	}

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