WebSVN – Kolibri OS – Blame – /contrib/sdk/sources/Mesa/src/mesa/main/bufferobj.c

Rev	Author	Line No.	Line
4358	Serge	1	/*
		2	* Mesa 3-D graphics library
		3	*
		4	* Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
		5	* Copyright (C) 2009 VMware, Inc. All Rights Reserved.
		6	*
		7	* Permission is hereby granted, free of charge, to any person obtaining a
		8	* copy of this software and associated documentation files (the "Software"),
		9	* to deal in the Software without restriction, including without limitation
		10	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
		11	* and/or sell copies of the Software, and to permit persons to whom the
		12	* Software is furnished to do so, subject to the following conditions:
		13	*
		14	* The above copyright notice and this permission notice shall be included
		15	* in all copies or substantial portions of the Software.
		16	*
		17	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
		18	* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
		19	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
		20	* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
		21	* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
		22	* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
		23	* OTHER DEALINGS IN THE SOFTWARE.
		24	*/
		25
		26
		27	/**
		28	* \file bufferobj.c
		29	* \brief Functions for the GL_ARB_vertex/pixel_buffer_object extensions.
		30	* \author Brian Paul, Ian Romanick
		31	*/
		32
		33	#include
		34	#include "glheader.h"
		35	#include "enums.h"
		36	#include "hash.h"
		37	#include "imports.h"
		38	#include "image.h"
		39	#include "context.h"
		40	#include "bufferobj.h"
		41	#include "fbobject.h"
		42	#include "mtypes.h"
		43	#include "texobj.h"
		44	#include "transformfeedback.h"
		45	#include "dispatch.h"
		46
		47
		48	/* Debug flags */
		49	/#define VBO_DEBUG/
		50	/#define BOUNDS_CHECK/
		51
		52
		53	/**
		54	* Used as a placeholder for buffer objects between glGenBuffers() and
		55	* glBindBuffer() so that glIsBuffer() can work correctly.
		56	*/
		57	static struct gl_buffer_object DummyBufferObject;
		58
		59
		60	/**
		61	* Return pointer to address of a buffer object target.
		62	* \param ctx the GL context
		63	* \param target the buffer object target to be retrieved.
		64	* \return pointer to pointer to the buffer object bound to \c target in the
		65	* specified context or \c NULL if \c target is invalid.
		66	*/
		67	static inline struct gl_buffer_object **
		68	get_buffer_target(struct gl_context *ctx, GLenum target)
		69	{
		70	/* Other targets are only supported in desktop OpenGL and OpenGL ES 3.0.
		71	*/
		72	if (!_mesa_is_desktop_gl(ctx) && !_mesa_is_gles3(ctx)
		73	&& target != GL_ARRAY_BUFFER && target != GL_ELEMENT_ARRAY_BUFFER)
		74	return NULL;
		75
		76	switch (target) {
		77	case GL_ARRAY_BUFFER_ARB:
		78	return &ctx->Array.ArrayBufferObj;
		79	case GL_ELEMENT_ARRAY_BUFFER_ARB:
		80	return &ctx->Array.ArrayObj->ElementArrayBufferObj;
		81	case GL_PIXEL_PACK_BUFFER_EXT:
		82	return &ctx->Pack.BufferObj;
		83	case GL_PIXEL_UNPACK_BUFFER_EXT:
		84	return &ctx->Unpack.BufferObj;
		85	case GL_COPY_READ_BUFFER:
		86	return &ctx->CopyReadBuffer;
		87	case GL_COPY_WRITE_BUFFER:
		88	return &ctx->CopyWriteBuffer;
		89	case GL_TRANSFORM_FEEDBACK_BUFFER:
		90	if (ctx->Extensions.EXT_transform_feedback) {
		91	return &ctx->TransformFeedback.CurrentBuffer;
		92	}
		93	break;
		94	case GL_TEXTURE_BUFFER:
		95	if (ctx->API == API_OPENGL_CORE &&
		96	ctx->Extensions.ARB_texture_buffer_object) {
		97	return &ctx->Texture.BufferObject;
		98	}
		99	break;
		100	case GL_UNIFORM_BUFFER:
		101	if (ctx->Extensions.ARB_uniform_buffer_object) {
		102	return &ctx->UniformBuffer;
		103	}
		104	break;
		105	default:
		106	return NULL;
		107	}
		108	return NULL;
		109	}
		110
		111
		112	/**
		113	* Get the buffer object bound to the specified target in a GL context.
		114	* \param ctx the GL context
		115	* \param target the buffer object target to be retrieved.
		116	* \return pointer to the buffer object bound to \c target in the
		117	* specified context or \c NULL if \c target is invalid.
		118	*/
		119	static inline struct gl_buffer_object *
		120	get_buffer(struct gl_context ctx, const char func, GLenum target)
		121	{
		122	struct gl_buffer_object **bufObj = get_buffer_target(ctx, target);
		123
		124	if (!bufObj) {
		125	_mesa_error(ctx, GL_INVALID_ENUM, "%s(target)", func);
		126	return NULL;
		127	}
		128
		129	if (!_mesa_is_bufferobj(*bufObj)) {
		130	_mesa_error(ctx, GL_INVALID_OPERATION, "%s(buffer 0)", func);
		131	return NULL;
		132	}
		133
		134	return *bufObj;
		135	}
		136
		137
		138	/**
		139	* Convert a GLbitfield describing the mapped buffer access flags
		140	* into one of GL_READ_WRITE, GL_READ_ONLY, or GL_WRITE_ONLY.
		141	*/
		142	static GLenum
		143	simplified_access_mode(struct gl_context *ctx, GLbitfield access)
		144	{
		145	const GLbitfield rwFlags = GL_MAP_READ_BIT \| GL_MAP_WRITE_BIT;
		146	if ((access & rwFlags) == rwFlags)
		147	return GL_READ_WRITE;
		148	if ((access & GL_MAP_READ_BIT) == GL_MAP_READ_BIT)
		149	return GL_READ_ONLY;
		150	if ((access & GL_MAP_WRITE_BIT) == GL_MAP_WRITE_BIT)
		151	return GL_WRITE_ONLY;
		152
		153	/* Otherwise, AccessFlags is zero (the default state).
		154	*
		155	* Table 2.6 on page 31 (page 44 of the PDF) of the OpenGL 1.5 spec says:
		156	*
		157	* Name Type Initial Value Legal Values
		158	* ... ... ... ...
		159	* BUFFER_ACCESS enum READ_WRITE READ_ONLY, WRITE_ONLY
		160	* READ_WRITE
		161	*
		162	* However, table 6.8 in the GL_OES_mapbuffer extension says:
		163	*
		164	* Get Value Type Get Command Value Description
		165	* --------- ---- ----------- ----- -----------
		166	* BUFFER_ACCESS_OES Z1 GetBufferParameteriv WRITE_ONLY_OES buffer map flag
		167	*
		168	* The difference is because GL_OES_mapbuffer only supports mapping buffers
		169	* write-only.
		170	*/
		171	assert(access == 0);
		172
		173	return _mesa_is_gles(ctx) ? GL_WRITE_ONLY : GL_READ_WRITE;
		174	}
		175
		176
		177	/**
		178	* Tests the subdata range parameters and sets the GL error code for
		179	* \c glBufferSubDataARB and \c glGetBufferSubDataARB.
		180	*
		181	* \param ctx GL context.
		182	* \param target Buffer object target on which to operate.
		183	* \param offset Offset of the first byte of the subdata range.
		184	* \param size Size, in bytes, of the subdata range.
		185	* \param caller Name of calling function for recording errors.
		186	* \return A pointer to the buffer object bound to \c target in the
		187	* specified context or \c NULL if any of the parameter or state
		188	* conditions for \c glBufferSubDataARB or \c glGetBufferSubDataARB
		189	* are invalid.
		190	*
		191	* \sa glBufferSubDataARB, glGetBufferSubDataARB
		192	*/
		193	static struct gl_buffer_object *
		194	buffer_object_subdata_range_good( struct gl_context * ctx, GLenum target,
		195	GLintptrARB offset, GLsizeiptrARB size,
		196	const char *caller )
		197	{
		198	struct gl_buffer_object *bufObj;
		199
		200	if (size < 0) {
		201	_mesa_error(ctx, GL_INVALID_VALUE, "%s(size < 0)", caller);
		202	return NULL;
		203	}
		204
		205	if (offset < 0) {
		206	_mesa_error(ctx, GL_INVALID_VALUE, "%s(offset < 0)", caller);
		207	return NULL;
		208	}
		209
		210	bufObj = get_buffer(ctx, caller, target);
		211	if (!bufObj)
		212	return NULL;
		213
		214	if (offset + size > bufObj->Size) {
		215	_mesa_error(ctx, GL_INVALID_VALUE,
		216	"%s(offset %lu + size %lu > buffer size %lu)", caller,
		217	(unsigned long) offset,
		218	(unsigned long) size,
		219	(unsigned long) bufObj->Size);
		220	return NULL;
		221	}
		222	if (_mesa_bufferobj_mapped(bufObj)) {
		223	/* Buffer is currently mapped */
		224	_mesa_error(ctx, GL_INVALID_OPERATION, "%s", caller);
		225	return NULL;
		226	}
		227
		228	return bufObj;
		229	}
		230
		231
		232	/**
		233	* Allocate and initialize a new buffer object.
		234	*
		235	* Default callback for the \c dd_function_table::NewBufferObject() hook.
		236	*/
		237	static struct gl_buffer_object *
		238	_mesa_new_buffer_object( struct gl_context *ctx, GLuint name, GLenum target )
		239	{
		240	struct gl_buffer_object *obj;
		241
		242	(void) ctx;
		243
		244	obj = MALLOC_STRUCT(gl_buffer_object);
		245	_mesa_initialize_buffer_object(ctx, obj, name, target);
		246	return obj;
		247	}
		248
		249
		250	/**
		251	* Delete a buffer object.
		252	*
		253	* Default callback for the \c dd_function_table::DeleteBuffer() hook.
		254	*/
		255	static void
		256	_mesa_delete_buffer_object(struct gl_context *ctx,
		257	struct gl_buffer_object *bufObj)
		258	{
		259	(void) ctx;
		260
		261	free(bufObj->Data);
		262
		263	/* assign strange values here to help w/ debugging */
		264	bufObj->RefCount = -1000;
		265	bufObj->Name = ~0;
		266
		267	_glthread_DESTROY_MUTEX(bufObj->Mutex);
		268	free(bufObj);
		269	}
		270
		271
		272
		273	/**
		274	* Set ptr to bufObj w/ reference counting.
		275	* This is normally only called from the _mesa_reference_buffer_object() macro
		276	* when there's a real pointer change.
		277	*/
		278	void
		279	_mesa_reference_buffer_object_(struct gl_context *ctx,
		280	struct gl_buffer_object **ptr,
		281	struct gl_buffer_object *bufObj)
		282	{
		283	if (*ptr) {
		284	/* Unreference the old buffer */
		285	GLboolean deleteFlag = GL_FALSE;
		286	struct gl_buffer_object oldObj = ptr;
		287
		288	_glthread_LOCK_MUTEX(oldObj->Mutex);
		289	ASSERT(oldObj->RefCount > 0);
		290	oldObj->RefCount--;
		291	#if 0
		292	printf("BufferObj %p %d DECR to %d\n",
		293	(void *) oldObj, oldObj->Name, oldObj->RefCount);
		294	#endif
		295	deleteFlag = (oldObj->RefCount == 0);
		296	_glthread_UNLOCK_MUTEX(oldObj->Mutex);
		297
		298	if (deleteFlag) {
		299
		300	/* some sanity checking: don't delete a buffer still in use */
		301	#if 0
		302	/* unfortunately, these tests are invalid during context tear-down */
		303	ASSERT(ctx->Array.ArrayBufferObj != bufObj);
		304	ASSERT(ctx->Array.ArrayObj->ElementArrayBufferObj != bufObj);
		305	ASSERT(ctx->Array.ArrayObj->Vertex.BufferObj != bufObj);
		306	#endif
		307
		308	ASSERT(ctx->Driver.DeleteBuffer);
		309	ctx->Driver.DeleteBuffer(ctx, oldObj);
		310	}
		311
		312	*ptr = NULL;
		313	}
		314	ASSERT(!*ptr);
		315
		316	if (bufObj) {
		317	/* reference new buffer */
		318	_glthread_LOCK_MUTEX(bufObj->Mutex);
		319	if (bufObj->RefCount == 0) {
		320	/* this buffer's being deleted (look just above) */
		321	/* Not sure this can every really happen. Warn if it does. */
		322	_mesa_problem(NULL, "referencing deleted buffer object");
		323	*ptr = NULL;
		324	}
		325	else {
		326	bufObj->RefCount++;
		327	#if 0
		328	printf("BufferObj %p %d INCR to %d\n",
		329	(void *) bufObj, bufObj->Name, bufObj->RefCount);
		330	#endif
		331	*ptr = bufObj;
		332	}
		333	_glthread_UNLOCK_MUTEX(bufObj->Mutex);
		334	}
		335	}
		336
		337
		338	/**
		339	* Initialize a buffer object to default values.
		340	*/
		341	void
		342	_mesa_initialize_buffer_object( struct gl_context *ctx,
		343	struct gl_buffer_object *obj,
		344	GLuint name, GLenum target )
		345	{
		346	(void) target;
		347
		348	memset(obj, 0, sizeof(struct gl_buffer_object));
		349	_glthread_INIT_MUTEX(obj->Mutex);
		350	obj->RefCount = 1;
		351	obj->Name = name;
		352	obj->Usage = GL_STATIC_DRAW_ARB;
		353	obj->AccessFlags = 0;
		354	}
		355
		356
		357
		358	/**
		359	* Callback called from _mesa_HashWalk()
		360	*/
		361	static void
		362	count_buffer_size(GLuint key, void data, void userData)
		363	{
		364	const struct gl_buffer_object *bufObj =
		365	(const struct gl_buffer_object *) data;
		366	GLuint total = (GLuint ) userData;
		367
		368	total = total + bufObj->Size;
		369	}
		370
		371
		372	/**
		373	* Compute total size (in bytes) of all buffer objects for the given context.
		374	* For debugging purposes.
		375	*/
		376	GLuint
		377	_mesa_total_buffer_object_memory(struct gl_context *ctx)
		378	{
		379	GLuint total = 0;
		380
		381	_mesa_HashWalk(ctx->Shared->BufferObjects, count_buffer_size, &total);
		382
		383	return total;
		384	}
		385
		386
		387	/**
		388	* Allocate space for and store data in a buffer object. Any data that was
		389	* previously stored in the buffer object is lost. If \c data is \c NULL,
		390	* memory will be allocated, but no copy will occur.
		391	*
		392	* This is the default callback for \c dd_function_table::BufferData()
		393	* Note that all GL error checking will have been done already.
		394	*
		395	* \param ctx GL context.
		396	* \param target Buffer object target on which to operate.
		397	* \param size Size, in bytes, of the new data store.
		398	* \param data Pointer to the data to store in the buffer object. This
		399	* pointer may be \c NULL.
		400	* \param usage Hints about how the data will be used.
		401	* \param bufObj Object to be used.
		402	*
		403	* \return GL_TRUE for success, GL_FALSE for failure
		404	* \sa glBufferDataARB, dd_function_table::BufferData.
		405	*/
		406	static GLboolean
		407	_mesa_buffer_data( struct gl_context *ctx, GLenum target, GLsizeiptrARB size,
		408	const GLvoid * data, GLenum usage,
		409	struct gl_buffer_object * bufObj )
		410	{
		411	void * new_data;
		412
		413	(void) ctx; (void) target;
		414
		415	new_data = _mesa_realloc( bufObj->Data, bufObj->Size, size );
		416	if (new_data) {
		417	bufObj->Data = (GLubyte *) new_data;
		418	bufObj->Size = size;
		419	bufObj->Usage = usage;
		420
		421	if (data) {
		422	memcpy( bufObj->Data, data, size );
		423	}
		424
		425	return GL_TRUE;
		426	}
		427	else {
		428	return GL_FALSE;
		429	}
		430	}
		431
		432
		433	/**
		434	* Replace data in a subrange of buffer object. If the data range
		435	* specified by \c size + \c offset extends beyond the end of the buffer or
		436	* if \c data is \c NULL, no copy is performed.
		437	*
		438	* This is the default callback for \c dd_function_table::BufferSubData()
		439	* Note that all GL error checking will have been done already.
		440	*
		441	* \param ctx GL context.
		442	* \param target Buffer object target on which to operate.
		443	* \param offset Offset of the first byte to be modified.
		444	* \param size Size, in bytes, of the data range.
		445	* \param data Pointer to the data to store in the buffer object.
		446	* \param bufObj Object to be used.
		447	*
		448	* \sa glBufferSubDataARB, dd_function_table::BufferSubData.
		449	*/
		450	static void
		451	_mesa_buffer_subdata( struct gl_context *ctx, GLintptrARB offset,
		452	GLsizeiptrARB size, const GLvoid * data,
		453	struct gl_buffer_object * bufObj )
		454	{
		455	(void) ctx;
		456
		457	/* this should have been caught in _mesa_BufferSubData() */
		458	ASSERT(size + offset <= bufObj->Size);
		459
		460	if (bufObj->Data) {
		461	memcpy( (GLubyte *) bufObj->Data + offset, data, size );
		462	}
		463	}
		464
		465
		466	/**
		467	* Retrieve data from a subrange of buffer object. If the data range
		468	* specified by \c size + \c offset extends beyond the end of the buffer or
		469	* if \c data is \c NULL, no copy is performed.
		470	*
		471	* This is the default callback for \c dd_function_table::GetBufferSubData()
		472	* Note that all GL error checking will have been done already.
		473	*
		474	* \param ctx GL context.
		475	* \param target Buffer object target on which to operate.
		476	* \param offset Offset of the first byte to be fetched.
		477	* \param size Size, in bytes, of the data range.
		478	* \param data Destination for data
		479	* \param bufObj Object to be used.
		480	*
		481	* \sa glBufferGetSubDataARB, dd_function_table::GetBufferSubData.
		482	*/
		483	static void
		484	_mesa_buffer_get_subdata( struct gl_context *ctx, GLintptrARB offset,
		485	GLsizeiptrARB size, GLvoid * data,
		486	struct gl_buffer_object * bufObj )
		487	{
		488	(void) ctx;
		489
		490	if (bufObj->Data && ((GLsizeiptrARB) (size + offset) <= bufObj->Size)) {
		491	memcpy( data, (GLubyte *) bufObj->Data + offset, size );
		492	}
		493	}
		494
		495
		496	/**
		497	* Default fallback for \c dd_function_table::MapBufferRange().
		498	* Called via glMapBufferRange().
		499	*/
		500	static void *
		501	_mesa_buffer_map_range( struct gl_context *ctx, GLintptr offset,
		502	GLsizeiptr length, GLbitfield access,
		503	struct gl_buffer_object *bufObj )
		504	{
		505	(void) ctx;
		506	assert(!_mesa_bufferobj_mapped(bufObj));
		507	/* Just return a direct pointer to the data */
		508	bufObj->Pointer = bufObj->Data + offset;
		509	bufObj->Length = length;
		510	bufObj->Offset = offset;
		511	bufObj->AccessFlags = access;
		512	return bufObj->Pointer;
		513	}
		514
		515
		516	/**
		517	* Default fallback for \c dd_function_table::FlushMappedBufferRange().
		518	* Called via glFlushMappedBufferRange().
		519	*/
		520	static void
		521	_mesa_buffer_flush_mapped_range( struct gl_context *ctx,
		522	GLintptr offset, GLsizeiptr length,
		523	struct gl_buffer_object *obj )
		524	{
		525	(void) ctx;
		526	(void) offset;
		527	(void) length;
		528	(void) obj;
		529	/* no-op */
		530	}
		531
		532
		533	/**
		534	* Default callback for \c dd_function_table::MapBuffer().
		535	*
		536	* The input parameters will have been already tested for errors.
		537	*
		538	* \sa glUnmapBufferARB, dd_function_table::UnmapBuffer
		539	*/
		540	static GLboolean
		541	_mesa_buffer_unmap( struct gl_context ctx, struct gl_buffer_object bufObj )
		542	{
		543	(void) ctx;
		544	/* XXX we might assert here that bufObj->Pointer is non-null */
		545	bufObj->Pointer = NULL;
		546	bufObj->Length = 0;
		547	bufObj->Offset = 0;
		548	bufObj->AccessFlags = 0x0;
		549	return GL_TRUE;
		550	}
		551
		552
		553	/**
		554	* Default fallback for \c dd_function_table::CopyBufferSubData().
		555	* Called via glCopyBufferSubData().
		556	*/
		557	static void
		558	_mesa_copy_buffer_subdata(struct gl_context *ctx,
		559	struct gl_buffer_object *src,
		560	struct gl_buffer_object *dst,
		561	GLintptr readOffset, GLintptr writeOffset,
		562	GLsizeiptr size)
		563	{
		564	GLubyte srcPtr, dstPtr;
		565
		566	/* the buffers should not be mapped */
		567	assert(!_mesa_bufferobj_mapped(src));
		568	assert(!_mesa_bufferobj_mapped(dst));
		569
		570	if (src == dst) {
		571	srcPtr = dstPtr = ctx->Driver.MapBufferRange(ctx, 0, src->Size,
		572	GL_MAP_READ_BIT \|
		573	GL_MAP_WRITE_BIT, src);
		574
		575	if (!srcPtr)
		576	return;
		577
		578	srcPtr += readOffset;
		579	dstPtr += writeOffset;
		580	} else {
		581	srcPtr = ctx->Driver.MapBufferRange(ctx, readOffset, size,
		582	GL_MAP_READ_BIT, src);
		583	dstPtr = ctx->Driver.MapBufferRange(ctx, writeOffset, size,
		584	(GL_MAP_WRITE_BIT \|
		585	GL_MAP_INVALIDATE_RANGE_BIT), dst);
		586	}
		587
		588	/* Note: the src and dst regions will never overlap. Trying to do so
		589	* would generate GL_INVALID_VALUE earlier.
		590	*/
		591	if (srcPtr && dstPtr)
		592	memcpy(dstPtr, srcPtr, size);
		593
		594	ctx->Driver.UnmapBuffer(ctx, src);
		595	if (dst != src)
		596	ctx->Driver.UnmapBuffer(ctx, dst);
		597	}
		598
		599
		600
		601	/**
		602	* Initialize the state associated with buffer objects
		603	*/
		604	void
		605	_mesa_init_buffer_objects( struct gl_context *ctx )
		606	{
		607	GLuint i;
		608
		609	memset(&DummyBufferObject, 0, sizeof(DummyBufferObject));
		610	_glthread_INIT_MUTEX(DummyBufferObject.Mutex);
		611	DummyBufferObject.RefCount = 100010001000; /* never delete */
		612
		613	_mesa_reference_buffer_object(ctx, &ctx->Array.ArrayBufferObj,
		614	ctx->Shared->NullBufferObj);
		615
		616	_mesa_reference_buffer_object(ctx, &ctx->CopyReadBuffer,
		617	ctx->Shared->NullBufferObj);
		618	_mesa_reference_buffer_object(ctx, &ctx->CopyWriteBuffer,
		619	ctx->Shared->NullBufferObj);
		620
		621	_mesa_reference_buffer_object(ctx, &ctx->UniformBuffer,
		622	ctx->Shared->NullBufferObj);
		623
		624	for (i = 0; i < MAX_COMBINED_UNIFORM_BUFFERS; i++) {
		625	_mesa_reference_buffer_object(ctx,
		626	&ctx->UniformBufferBindings[i].BufferObject,
		627	ctx->Shared->NullBufferObj);
		628	ctx->UniformBufferBindings[i].Offset = -1;
		629	ctx->UniformBufferBindings[i].Size = -1;
		630	}
		631	}
		632
		633
		634	void
		635	_mesa_free_buffer_objects( struct gl_context *ctx )
		636	{
		637	GLuint i;
		638
		639	_mesa_reference_buffer_object(ctx, &ctx->Array.ArrayBufferObj, NULL);
		640
		641	_mesa_reference_buffer_object(ctx, &ctx->CopyReadBuffer, NULL);
		642	_mesa_reference_buffer_object(ctx, &ctx->CopyWriteBuffer, NULL);
		643
		644	_mesa_reference_buffer_object(ctx, &ctx->UniformBuffer, NULL);
		645
		646	for (i = 0; i < MAX_COMBINED_UNIFORM_BUFFERS; i++) {
		647	_mesa_reference_buffer_object(ctx,
		648	&ctx->UniformBufferBindings[i].BufferObject,
		649	NULL);
		650	}
		651	}
		652
		653	static bool
		654	handle_bind_buffer_gen(struct gl_context *ctx,
		655	GLenum target,
		656	GLuint buffer,
		657	struct gl_buffer_object **buf_handle)
		658	{
		659	struct gl_buffer_object buf = buf_handle;
		660
		661	if (!buf && ctx->API == API_OPENGL_CORE) {
		662	_mesa_error(ctx, GL_INVALID_OPERATION, "glBindBuffer(non-gen name)");
		663	return false;
		664	}
		665
		666	if (!buf \|\| buf == &DummyBufferObject) {
		667	/* If this is a new buffer object id, or one which was generated but
		668	* never used before, allocate a buffer object now.
		669	*/
		670	ASSERT(ctx->Driver.NewBufferObject);
		671	buf = ctx->Driver.NewBufferObject(ctx, buffer, target);
		672	if (!buf) {
		673	_mesa_error(ctx, GL_OUT_OF_MEMORY, "glBindBufferARB");
		674	return false;
		675	}
		676	_mesa_HashInsert(ctx->Shared->BufferObjects, buffer, buf);
		677	*buf_handle = buf;
		678	}
		679
		680	return true;
		681	}
		682
		683	/**
		684	* Bind the specified target to buffer for the specified context.
		685	* Called by glBindBuffer() and other functions.
		686	*/
		687	static void
		688	bind_buffer_object(struct gl_context *ctx, GLenum target, GLuint buffer)
		689	{
		690	struct gl_buffer_object *oldBufObj;
		691	struct gl_buffer_object *newBufObj = NULL;
		692	struct gl_buffer_object **bindTarget = NULL;
		693
		694	bindTarget = get_buffer_target(ctx, target);
		695	if (!bindTarget) {
		696	_mesa_error(ctx, GL_INVALID_ENUM, "glBindBufferARB(target 0x%x)", target);
		697	return;
		698	}
		699
		700	/* Get pointer to old buffer object (to be unbound) */
		701	oldBufObj = *bindTarget;
		702	if (oldBufObj && oldBufObj->Name == buffer && !oldBufObj->DeletePending)
		703	return; /* rebinding the same buffer object- no change */
		704
		705	/*
		706	* Get pointer to new buffer object (newBufObj)
		707	*/
		708	if (buffer == 0) {
		709	/* The spec says there's not a buffer object named 0, but we use
		710	* one internally because it simplifies things.
		711	*/
		712	newBufObj = ctx->Shared->NullBufferObj;
		713	}
		714	else {
		715	/* non-default buffer object */
		716	newBufObj = _mesa_lookup_bufferobj(ctx, buffer);
		717	if (!handle_bind_buffer_gen(ctx, target, buffer, &newBufObj))
		718	return;
		719	}
		720
		721	/* bind new buffer */
		722	_mesa_reference_buffer_object(ctx, bindTarget, newBufObj);
		723
		724	/* Pass BindBuffer call to device driver */
		725	if (ctx->Driver.BindBuffer)
		726	ctx->Driver.BindBuffer( ctx, target, newBufObj );
		727	}
		728
		729
		730	/**
		731	* Update the default buffer objects in the given context to reference those
		732	* specified in the shared state and release those referencing the old
		733	* shared state.
		734	*/
		735	void
		736	_mesa_update_default_objects_buffer_objects(struct gl_context *ctx)
		737	{
		738	/* Bind the NullBufferObj to remove references to those
		739	* in the shared context hash table.
		740	*/
		741	bind_buffer_object( ctx, GL_ARRAY_BUFFER_ARB, 0);
		742	bind_buffer_object( ctx, GL_ELEMENT_ARRAY_BUFFER_ARB, 0);
		743	bind_buffer_object( ctx, GL_PIXEL_PACK_BUFFER_ARB, 0);
		744	bind_buffer_object( ctx, GL_PIXEL_UNPACK_BUFFER_ARB, 0);
		745	}
		746
		747
		748
		749	/**
		750	* Return the gl_buffer_object for the given ID.
		751	* Always return NULL for ID 0.
		752	*/
		753	struct gl_buffer_object *
		754	_mesa_lookup_bufferobj(struct gl_context *ctx, GLuint buffer)
		755	{
		756	if (buffer == 0)
		757	return NULL;
		758	else
		759	return (struct gl_buffer_object *)
		760	_mesa_HashLookup(ctx->Shared->BufferObjects, buffer);
		761	}
		762
		763
		764	/**
		765	* If *ptr points to obj, set ptr = the Null/default buffer object.
		766	* This is a helper for buffer object deletion.
		767	* The GL spec says that deleting a buffer object causes it to get
		768	* unbound from all arrays in the current context.
		769	*/
		770	static void
		771	unbind(struct gl_context *ctx,
		772	struct gl_buffer_object **ptr,
		773	struct gl_buffer_object *obj)
		774	{
		775	if (*ptr == obj) {
		776	_mesa_reference_buffer_object(ctx, ptr, ctx->Shared->NullBufferObj);
		777	}
		778	}
		779
		780
		781	/**
		782	* Plug default/fallback buffer object functions into the device
		783	* driver hooks.
		784	*/
		785	void
		786	_mesa_init_buffer_object_functions(struct dd_function_table *driver)
		787	{
		788	/* GL_ARB_vertex/pixel_buffer_object */
		789	driver->NewBufferObject = _mesa_new_buffer_object;
		790	driver->DeleteBuffer = _mesa_delete_buffer_object;
		791	driver->BindBuffer = NULL;
		792	driver->BufferData = _mesa_buffer_data;
		793	driver->BufferSubData = _mesa_buffer_subdata;
		794	driver->GetBufferSubData = _mesa_buffer_get_subdata;
		795	driver->UnmapBuffer = _mesa_buffer_unmap;
		796
		797	/* GL_ARB_map_buffer_range */
		798	driver->MapBufferRange = _mesa_buffer_map_range;
		799	driver->FlushMappedBufferRange = _mesa_buffer_flush_mapped_range;
		800
		801	/* GL_ARB_copy_buffer */
		802	driver->CopyBufferSubData = _mesa_copy_buffer_subdata;
		803	}
		804
		805
		806
		807	/**********************************************************************/
		808	/* API Functions */
		809	/**********************************************************************/
		810
		811	void GLAPIENTRY
		812	_mesa_BindBuffer(GLenum target, GLuint buffer)
		813	{
		814	GET_CURRENT_CONTEXT(ctx);
		815
		816	if (MESA_VERBOSE & VERBOSE_API)
		817	_mesa_debug(ctx, "glBindBuffer(%s, %u)\n",
		818	_mesa_lookup_enum_by_nr(target), buffer);
		819
		820	bind_buffer_object(ctx, target, buffer);
		821	}
		822
		823
		824	/**
		825	* Delete a set of buffer objects.
		826	*
		827	* \param n Number of buffer objects to delete.
		828	* \param ids Array of \c n buffer object IDs.
		829	*/
		830	void GLAPIENTRY
		831	_mesa_DeleteBuffers(GLsizei n, const GLuint *ids)
		832	{
		833	GET_CURRENT_CONTEXT(ctx);
		834	GLsizei i;
		835	FLUSH_VERTICES(ctx, 0);
		836
		837	if (n < 0) {
		838	_mesa_error(ctx, GL_INVALID_VALUE, "glDeleteBuffersARB(n)");
		839	return;
		840	}
		841
		842	_glthread_LOCK_MUTEX(ctx->Shared->Mutex);
		843
		844	for (i = 0; i < n; i++) {
		845	struct gl_buffer_object *bufObj = _mesa_lookup_bufferobj(ctx, ids[i]);
		846	if (bufObj) {
		847	struct gl_array_object *arrayObj = ctx->Array.ArrayObj;
		848	GLuint j;
		849
		850	ASSERT(bufObj->Name == ids[i] \|\| bufObj == &DummyBufferObject);
		851
		852	if (_mesa_bufferobj_mapped(bufObj)) {
		853	/* if mapped, unmap it now */
		854	ctx->Driver.UnmapBuffer(ctx, bufObj);
		855	bufObj->AccessFlags = 0;
		856	bufObj->Pointer = NULL;
		857	}
		858
		859	/* unbind any vertex pointers bound to this buffer */
		860	for (j = 0; j < Elements(arrayObj->VertexAttrib); j++) {
		861	unbind(ctx, &arrayObj->VertexAttrib[j].BufferObj, bufObj);
		862	}
		863
		864	if (ctx->Array.ArrayBufferObj == bufObj) {
		865	_mesa_BindBuffer( GL_ARRAY_BUFFER_ARB, 0 );
		866	}
		867	if (arrayObj->ElementArrayBufferObj == bufObj) {
		868	_mesa_BindBuffer( GL_ELEMENT_ARRAY_BUFFER_ARB, 0 );
		869	}
		870
		871	/* unbind ARB_copy_buffer binding points */
		872	if (ctx->CopyReadBuffer == bufObj) {
		873	_mesa_BindBuffer( GL_COPY_READ_BUFFER, 0 );
		874	}
		875	if (ctx->CopyWriteBuffer == bufObj) {
		876	_mesa_BindBuffer( GL_COPY_WRITE_BUFFER, 0 );
		877	}
		878
		879	/* unbind transform feedback binding points */
		880	if (ctx->TransformFeedback.CurrentBuffer == bufObj) {
		881	_mesa_BindBuffer( GL_TRANSFORM_FEEDBACK_BUFFER, 0 );
		882	}
		883	for (j = 0; j < MAX_FEEDBACK_BUFFERS; j++) {
		884	if (ctx->TransformFeedback.CurrentObject->Buffers[j] == bufObj) {
		885	_mesa_BindBufferBase( GL_TRANSFORM_FEEDBACK_BUFFER, j, 0 );
		886	}
		887	}
		888
		889	/* unbind UBO binding points */
		890	for (j = 0; j < ctx->Const.MaxUniformBufferBindings; j++) {
		891	if (ctx->UniformBufferBindings[j].BufferObject == bufObj) {
		892	_mesa_BindBufferBase( GL_UNIFORM_BUFFER, j, 0 );
		893	}
		894	}
		895
		896	if (ctx->UniformBuffer == bufObj) {
		897	_mesa_BindBuffer( GL_UNIFORM_BUFFER, 0 );
		898	}
		899
		900	/* unbind any pixel pack/unpack pointers bound to this buffer */
		901	if (ctx->Pack.BufferObj == bufObj) {
		902	_mesa_BindBuffer( GL_PIXEL_PACK_BUFFER_EXT, 0 );
		903	}
		904	if (ctx->Unpack.BufferObj == bufObj) {
		905	_mesa_BindBuffer( GL_PIXEL_UNPACK_BUFFER_EXT, 0 );
		906	}
		907
		908	if (ctx->Texture.BufferObject == bufObj) {
		909	_mesa_BindBuffer( GL_TEXTURE_BUFFER, 0 );
		910	}
		911
		912	/* The ID is immediately freed for re-use */
		913	_mesa_HashRemove(ctx->Shared->BufferObjects, ids[i]);
		914	/* Make sure we do not run into the classic ABA problem on bind.
		915	* We don't want to allow re-binding a buffer object that's been
		916	* "deleted" by glDeleteBuffers().
		917	*
		918	* The explicit rebinding to the default object in the current context
		919	* prevents the above in the current context, but another context
		920	* sharing the same objects might suffer from this problem.
		921	* The alternative would be to do the hash lookup in any case on bind
		922	* which would introduce more runtime overhead than this.
		923	*/
		924	bufObj->DeletePending = GL_TRUE;
		925	_mesa_reference_buffer_object(ctx, &bufObj, NULL);
		926	}
		927	}
		928
		929	_glthread_UNLOCK_MUTEX(ctx->Shared->Mutex);
		930	}
		931
		932
		933	/**
		934	* Generate a set of unique buffer object IDs and store them in \c buffer.
		935	*
		936	* \param n Number of IDs to generate.
		937	* \param buffer Array of \c n locations to store the IDs.
		938	*/
		939	void GLAPIENTRY
		940	_mesa_GenBuffers(GLsizei n, GLuint *buffer)
		941	{
		942	GET_CURRENT_CONTEXT(ctx);
		943	GLuint first;
		944	GLint i;
		945
		946	if (MESA_VERBOSE & VERBOSE_API)
		947	_mesa_debug(ctx, "glGenBuffers(%d)\n", n);
		948
		949	if (n < 0) {
		950	_mesa_error(ctx, GL_INVALID_VALUE, "glGenBuffersARB");
		951	return;
		952	}
		953
		954	if (!buffer) {
		955	return;
		956	}
		957
		958	/*
		959	* This must be atomic (generation and allocation of buffer object IDs)
		960	*/
		961	_glthread_LOCK_MUTEX(ctx->Shared->Mutex);
		962
		963	first = _mesa_HashFindFreeKeyBlock(ctx->Shared->BufferObjects, n);
		964
		965	/* Insert the ID and pointer to dummy buffer object into hash table */
		966	for (i = 0; i < n; i++) {
		967	_mesa_HashInsert(ctx->Shared->BufferObjects, first + i,
		968	&DummyBufferObject);
		969	buffer[i] = first + i;
		970	}
		971
		972	_glthread_UNLOCK_MUTEX(ctx->Shared->Mutex);
		973	}
		974
		975
		976	/**
		977	* Determine if ID is the name of a buffer object.
		978	*
		979	* \param id ID of the potential buffer object.
		980	* \return \c GL_TRUE if \c id is the name of a buffer object,
		981	* \c GL_FALSE otherwise.
		982	*/
		983	GLboolean GLAPIENTRY
		984	_mesa_IsBuffer(GLuint id)
		985	{
		986	struct gl_buffer_object *bufObj;
		987	GET_CURRENT_CONTEXT(ctx);
		988	ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);
		989
		990	_glthread_LOCK_MUTEX(ctx->Shared->Mutex);
		991	bufObj = _mesa_lookup_bufferobj(ctx, id);
		992	_glthread_UNLOCK_MUTEX(ctx->Shared->Mutex);
		993
		994	return bufObj && bufObj != &DummyBufferObject;
		995	}
		996
		997
		998	void GLAPIENTRY
		999	_mesa_BufferData(GLenum target, GLsizeiptrARB size,
		1000	const GLvoid * data, GLenum usage)
		1001	{
		1002	GET_CURRENT_CONTEXT(ctx);
		1003	struct gl_buffer_object *bufObj;
		1004	bool valid_usage;
		1005
		1006	if (MESA_VERBOSE & VERBOSE_API)
		1007	_mesa_debug(ctx, "glBufferData(%s, %ld, %p, %s)\n",
		1008	_mesa_lookup_enum_by_nr(target),
		1009	(long int) size, data,
		1010	_mesa_lookup_enum_by_nr(usage));
		1011
		1012	if (size < 0) {
		1013	_mesa_error(ctx, GL_INVALID_VALUE, "glBufferDataARB(size < 0)");
		1014	return;
		1015	}
		1016
		1017	switch (usage) {
		1018	case GL_STREAM_DRAW_ARB:
		1019	valid_usage = (ctx->API != API_OPENGLES);
		1020	break;
		1021
		1022	case GL_STATIC_DRAW_ARB:
		1023	case GL_DYNAMIC_DRAW_ARB:
		1024	valid_usage = true;
		1025	break;
		1026
		1027	case GL_STREAM_READ_ARB:
		1028	case GL_STREAM_COPY_ARB:
		1029	case GL_STATIC_READ_ARB:
		1030	case GL_STATIC_COPY_ARB:
		1031	case GL_DYNAMIC_READ_ARB:
		1032	case GL_DYNAMIC_COPY_ARB:
		1033	valid_usage = _mesa_is_desktop_gl(ctx) \|\| _mesa_is_gles3(ctx);
		1034	break;
		1035
		1036	default:
		1037	valid_usage = false;
		1038	break;
		1039	}
		1040
		1041	if (!valid_usage) {
		1042	_mesa_error(ctx, GL_INVALID_ENUM, "glBufferData(usage)");
		1043	return;
		1044	}
		1045
		1046	bufObj = get_buffer(ctx, "glBufferDataARB", target);
		1047	if (!bufObj)
		1048	return;
		1049
		1050	if (_mesa_bufferobj_mapped(bufObj)) {
		1051	/* Unmap the existing buffer. We'll replace it now. Not an error. */
		1052	ctx->Driver.UnmapBuffer(ctx, bufObj);
		1053	bufObj->AccessFlags = 0;
		1054	ASSERT(bufObj->Pointer == NULL);
		1055	}
		1056
		1057	FLUSH_VERTICES(ctx, _NEW_BUFFER_OBJECT);
		1058
		1059	bufObj->Written = GL_TRUE;
		1060
		1061	#ifdef VBO_DEBUG
		1062	printf("glBufferDataARB(%u, sz %ld, from %p, usage 0x%x)\n",
		1063	bufObj->Name, size, data, usage);
		1064	#endif
		1065
		1066	#ifdef BOUNDS_CHECK
		1067	size += 100;
		1068	#endif
		1069
		1070	ASSERT(ctx->Driver.BufferData);
		1071	if (!ctx->Driver.BufferData( ctx, target, size, data, usage, bufObj )) {
		1072	_mesa_error(ctx, GL_OUT_OF_MEMORY, "glBufferDataARB()");
		1073	}
		1074	}
		1075
		1076
		1077	void GLAPIENTRY
		1078	_mesa_BufferSubData(GLenum target, GLintptrARB offset,
		1079	GLsizeiptrARB size, const GLvoid * data)
		1080	{
		1081	GET_CURRENT_CONTEXT(ctx);
		1082	struct gl_buffer_object *bufObj;
		1083
		1084	bufObj = buffer_object_subdata_range_good( ctx, target, offset, size,
		1085	"glBufferSubDataARB" );
		1086	if (!bufObj) {
		1087	/* error already recorded */
		1088	return;
		1089	}
		1090
		1091	if (size == 0)
		1092	return;
		1093
		1094	bufObj->Written = GL_TRUE;
		1095
		1096	ASSERT(ctx->Driver.BufferSubData);
		1097	ctx->Driver.BufferSubData( ctx, offset, size, data, bufObj );
		1098	}
		1099
		1100
		1101	void GLAPIENTRY
		1102	_mesa_GetBufferSubData(GLenum target, GLintptrARB offset,
		1103	GLsizeiptrARB size, void * data)
		1104	{
		1105	GET_CURRENT_CONTEXT(ctx);
		1106	struct gl_buffer_object *bufObj;
		1107
		1108	bufObj = buffer_object_subdata_range_good( ctx, target, offset, size,
		1109	"glGetBufferSubDataARB" );
		1110	if (!bufObj) {
		1111	/* error already recorded */
		1112	return;
		1113	}
		1114
		1115	ASSERT(ctx->Driver.GetBufferSubData);
		1116	ctx->Driver.GetBufferSubData( ctx, offset, size, data, bufObj );
		1117	}
		1118
		1119
		1120	void * GLAPIENTRY
		1121	_mesa_MapBuffer(GLenum target, GLenum access)
		1122	{
		1123	GET_CURRENT_CONTEXT(ctx);
		1124	struct gl_buffer_object * bufObj;
		1125	GLbitfield accessFlags;
		1126	void *map;
		1127	bool valid_access;
		1128
		1129	ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, NULL);
		1130
		1131	switch (access) {
		1132	case GL_READ_ONLY_ARB:
		1133	accessFlags = GL_MAP_READ_BIT;
		1134	valid_access = _mesa_is_desktop_gl(ctx);
		1135	break;
		1136	case GL_WRITE_ONLY_ARB:
		1137	accessFlags = GL_MAP_WRITE_BIT;
		1138	valid_access = true;
		1139	break;
		1140	case GL_READ_WRITE_ARB:
		1141	accessFlags = GL_MAP_READ_BIT \| GL_MAP_WRITE_BIT;
		1142	valid_access = _mesa_is_desktop_gl(ctx);
		1143	break;
		1144	default:
		1145	valid_access = false;
		1146	break;
		1147	}
		1148
		1149	if (!valid_access) {
		1150	_mesa_error(ctx, GL_INVALID_ENUM, "glMapBufferARB(access)");
		1151	return NULL;
		1152	}
		1153
		1154	bufObj = get_buffer(ctx, "glMapBufferARB", target);
		1155	if (!bufObj)
		1156	return NULL;
		1157
		1158	if (_mesa_bufferobj_mapped(bufObj)) {
		1159	_mesa_error(ctx, GL_INVALID_OPERATION, "glMapBufferARB(already mapped)");
		1160	return NULL;
		1161	}
		1162
		1163	if (!bufObj->Size) {
		1164	_mesa_error(ctx, GL_OUT_OF_MEMORY,
		1165	"glMapBuffer(buffer size = 0)");
		1166	return NULL;
		1167	}
		1168
		1169	ASSERT(ctx->Driver.MapBufferRange);
		1170	map = ctx->Driver.MapBufferRange(ctx, 0, bufObj->Size, accessFlags, bufObj);
		1171	if (!map) {
		1172	_mesa_error(ctx, GL_OUT_OF_MEMORY, "glMapBufferARB(map failed)");
		1173	return NULL;
		1174	}
		1175	else {
		1176	/* The driver callback should have set these fields.
		1177	* This is important because other modules (like VBO) might call
		1178	* the driver function directly.
		1179	*/
		1180	ASSERT(bufObj->Pointer == map);
		1181	ASSERT(bufObj->Length == bufObj->Size);
		1182	ASSERT(bufObj->Offset == 0);
		1183	bufObj->AccessFlags = accessFlags;
		1184	}
		1185
		1186	if (access == GL_WRITE_ONLY_ARB \|\| access == GL_READ_WRITE_ARB)
		1187	bufObj->Written = GL_TRUE;
		1188
		1189	#ifdef VBO_DEBUG
		1190	printf("glMapBufferARB(%u, sz %ld, access 0x%x)\n",
		1191	bufObj->Name, bufObj->Size, access);
		1192	if (access == GL_WRITE_ONLY_ARB) {
		1193	GLuint i;
		1194	GLubyte b = (GLubyte ) bufObj->Pointer;
		1195	for (i = 0; i < bufObj->Size; i++)
		1196	b[i] = i & 0xff;
		1197	}
		1198	#endif
		1199
		1200	#ifdef BOUNDS_CHECK
		1201	{
		1202	GLubyte buf = (GLubyte ) bufObj->Pointer;
		1203	GLuint i;
		1204	/* buffer is 100 bytes larger than requested, fill with magic value */
		1205	for (i = 0; i < 100; i++) {
		1206	buf[bufObj->Size - i - 1] = 123;
		1207	}
		1208	}
		1209	#endif
		1210
		1211	return bufObj->Pointer;
		1212	}
		1213
		1214
		1215	GLboolean GLAPIENTRY
		1216	_mesa_UnmapBuffer(GLenum target)
		1217	{
		1218	GET_CURRENT_CONTEXT(ctx);
		1219	struct gl_buffer_object *bufObj;
		1220	GLboolean status = GL_TRUE;
		1221	ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);
		1222
		1223	bufObj = get_buffer(ctx, "glUnmapBufferARB", target);
		1224	if (!bufObj)
		1225	return GL_FALSE;
		1226
		1227	if (!_mesa_bufferobj_mapped(bufObj)) {
		1228	_mesa_error(ctx, GL_INVALID_OPERATION, "glUnmapBufferARB");
		1229	return GL_FALSE;
		1230	}
		1231
		1232	#ifdef BOUNDS_CHECK
		1233	if (bufObj->Access != GL_READ_ONLY_ARB) {
		1234	GLubyte buf = (GLubyte ) bufObj->Pointer;
		1235	GLuint i;
		1236	/* check that last 100 bytes are still = magic value */
		1237	for (i = 0; i < 100; i++) {
		1238	GLuint pos = bufObj->Size - i - 1;
		1239	if (buf[pos] != 123) {
		1240	_mesa_warning(ctx, "Out of bounds buffer object write detected"
		1241	" at position %d (value = %u)\n",
		1242	pos, buf[pos]);
		1243	}
		1244	}
		1245	}
		1246	#endif
		1247
		1248	#ifdef VBO_DEBUG
		1249	if (bufObj->AccessFlags & GL_MAP_WRITE_BIT) {
		1250	GLuint i, unchanged = 0;
		1251	GLubyte b = (GLubyte ) bufObj->Pointer;
		1252	GLint pos = -1;
		1253	/* check which bytes changed */
		1254	for (i = 0; i < bufObj->Size - 1; i++) {
		1255	if (b[i] == (i & 0xff) && b[i+1] == ((i+1) & 0xff)) {
		1256	unchanged++;
		1257	if (pos == -1)
		1258	pos = i;
		1259	}
		1260	}
		1261	if (unchanged) {
		1262	printf("glUnmapBufferARB(%u): %u of %ld unchanged, starting at %d\n",
		1263	bufObj->Name, unchanged, bufObj->Size, pos);
		1264	}
		1265	}
		1266	#endif
		1267
		1268	status = ctx->Driver.UnmapBuffer( ctx, bufObj );
		1269	bufObj->AccessFlags = 0;
		1270	ASSERT(bufObj->Pointer == NULL);
		1271	ASSERT(bufObj->Offset == 0);
		1272	ASSERT(bufObj->Length == 0);
		1273
		1274	return status;
		1275	}
		1276
		1277
		1278	void GLAPIENTRY
		1279	_mesa_GetBufferParameteriv(GLenum target, GLenum pname, GLint *params)
		1280	{
		1281	GET_CURRENT_CONTEXT(ctx);
		1282	struct gl_buffer_object *bufObj;
		1283
		1284	bufObj = get_buffer(ctx, "glGetBufferParameterivARB", target);
		1285	if (!bufObj)
		1286	return;
		1287
		1288	switch (pname) {
		1289	case GL_BUFFER_SIZE_ARB:
		1290	*params = (GLint) bufObj->Size;
		1291	return;
		1292	case GL_BUFFER_USAGE_ARB:
		1293	*params = bufObj->Usage;
		1294	return;
		1295	case GL_BUFFER_ACCESS_ARB:
		1296	*params = simplified_access_mode(ctx, bufObj->AccessFlags);
		1297	return;
		1298	case GL_BUFFER_MAPPED_ARB:
		1299	*params = _mesa_bufferobj_mapped(bufObj);
		1300	return;
		1301	case GL_BUFFER_ACCESS_FLAGS:
		1302	if (!ctx->Extensions.ARB_map_buffer_range)
		1303	goto invalid_pname;
		1304	*params = bufObj->AccessFlags;
		1305	return;
		1306	case GL_BUFFER_MAP_OFFSET:
		1307	if (!ctx->Extensions.ARB_map_buffer_range)
		1308	goto invalid_pname;
		1309	*params = (GLint) bufObj->Offset;
		1310	return;
		1311	case GL_BUFFER_MAP_LENGTH:
		1312	if (!ctx->Extensions.ARB_map_buffer_range)
		1313	goto invalid_pname;
		1314	*params = (GLint) bufObj->Length;
		1315	return;
		1316	default:
		1317	; /* fall-through */
		1318	}
		1319
		1320	invalid_pname:
		1321	_mesa_error(ctx, GL_INVALID_ENUM, "glGetBufferParameterivARB(pname=%s)",
		1322	_mesa_lookup_enum_by_nr(pname));
		1323	}
		1324
		1325
		1326	/**
		1327	* New in GL 3.2
		1328	* This is pretty much a duplicate of GetBufferParameteriv() but the
		1329	* GL_BUFFER_SIZE_ARB attribute will be 64-bits on a 64-bit system.
		1330	*/
		1331	void GLAPIENTRY
		1332	_mesa_GetBufferParameteri64v(GLenum target, GLenum pname, GLint64 *params)
		1333	{
		1334	GET_CURRENT_CONTEXT(ctx);
		1335	struct gl_buffer_object *bufObj;
		1336
		1337	bufObj = get_buffer(ctx, "glGetBufferParameteri64v", target);
		1338	if (!bufObj)
		1339	return;
		1340
		1341	switch (pname) {
		1342	case GL_BUFFER_SIZE_ARB:
		1343	*params = bufObj->Size;
		1344	return;
		1345	case GL_BUFFER_USAGE_ARB:
		1346	*params = bufObj->Usage;
		1347	return;
		1348	case GL_BUFFER_ACCESS_ARB:
		1349	*params = simplified_access_mode(ctx, bufObj->AccessFlags);
		1350	return;
		1351	case GL_BUFFER_ACCESS_FLAGS:
		1352	if (!ctx->Extensions.ARB_map_buffer_range)
		1353	goto invalid_pname;
		1354	*params = bufObj->AccessFlags;
		1355	return;
		1356	case GL_BUFFER_MAPPED_ARB:
		1357	*params = _mesa_bufferobj_mapped(bufObj);
		1358	return;
		1359	case GL_BUFFER_MAP_OFFSET:
		1360	if (!ctx->Extensions.ARB_map_buffer_range)
		1361	goto invalid_pname;
		1362	*params = bufObj->Offset;
		1363	return;
		1364	case GL_BUFFER_MAP_LENGTH:
		1365	if (!ctx->Extensions.ARB_map_buffer_range)
		1366	goto invalid_pname;
		1367	*params = bufObj->Length;
		1368	return;
		1369	default:
		1370	; /* fall-through */
		1371	}
		1372
		1373	invalid_pname:
		1374	_mesa_error(ctx, GL_INVALID_ENUM, "glGetBufferParameteri64v(pname=%s)",
		1375	_mesa_lookup_enum_by_nr(pname));
		1376	}
		1377
		1378
		1379	void GLAPIENTRY
		1380	_mesa_GetBufferPointerv(GLenum target, GLenum pname, GLvoid **params)
		1381	{
		1382	GET_CURRENT_CONTEXT(ctx);
		1383	struct gl_buffer_object * bufObj;
		1384
		1385	if (pname != GL_BUFFER_MAP_POINTER_ARB) {
		1386	_mesa_error(ctx, GL_INVALID_ENUM, "glGetBufferPointervARB(pname)");
		1387	return;
		1388	}
		1389
		1390	bufObj = get_buffer(ctx, "glGetBufferPointervARB", target);
		1391	if (!bufObj)
		1392	return;
		1393
		1394	*params = bufObj->Pointer;
		1395	}
		1396
		1397
		1398	void GLAPIENTRY
		1399	_mesa_CopyBufferSubData(GLenum readTarget, GLenum writeTarget,
		1400	GLintptr readOffset, GLintptr writeOffset,
		1401	GLsizeiptr size)
		1402	{
		1403	GET_CURRENT_CONTEXT(ctx);
		1404	struct gl_buffer_object src, dst;
		1405
		1406	src = get_buffer(ctx, "glCopyBufferSubData", readTarget);
		1407	if (!src)
		1408	return;
		1409
		1410	dst = get_buffer(ctx, "glCopyBufferSubData", writeTarget);
		1411	if (!dst)
		1412	return;
		1413
		1414	if (_mesa_bufferobj_mapped(src)) {
		1415	_mesa_error(ctx, GL_INVALID_OPERATION,
		1416	"glCopyBufferSubData(readBuffer is mapped)");
		1417	return;
		1418	}
		1419
		1420	if (_mesa_bufferobj_mapped(dst)) {
		1421	_mesa_error(ctx, GL_INVALID_OPERATION,
		1422	"glCopyBufferSubData(writeBuffer is mapped)");
		1423	return;
		1424	}
		1425
		1426	if (readOffset < 0) {
		1427	_mesa_error(ctx, GL_INVALID_VALUE,
		1428	"glCopyBufferSubData(readOffset = %d)", (int) readOffset);
		1429	return;
		1430	}
		1431
		1432	if (writeOffset < 0) {
		1433	_mesa_error(ctx, GL_INVALID_VALUE,
		1434	"glCopyBufferSubData(writeOffset = %d)", (int) writeOffset);
		1435	return;
		1436	}
		1437
		1438	if (size < 0) {
		1439	_mesa_error(ctx, GL_INVALID_VALUE,
		1440	"glCopyBufferSubData(writeOffset = %d)", (int) size);
		1441	return;
		1442	}
		1443
		1444	if (readOffset + size > src->Size) {
		1445	_mesa_error(ctx, GL_INVALID_VALUE,
		1446	"glCopyBufferSubData(readOffset + size = %d)",
		1447	(int) (readOffset + size));
		1448	return;
		1449	}
		1450
		1451	if (writeOffset + size > dst->Size) {
		1452	_mesa_error(ctx, GL_INVALID_VALUE,
		1453	"glCopyBufferSubData(writeOffset + size = %d)",
		1454	(int) (writeOffset + size));
		1455	return;
		1456	}
		1457
		1458	if (src == dst) {
		1459	if (readOffset + size <= writeOffset) {
		1460	/* OK */
		1461	}
		1462	else if (writeOffset + size <= readOffset) {
		1463	/* OK */
		1464	}
		1465	else {
		1466	/* overlapping src/dst is illegal */
		1467	_mesa_error(ctx, GL_INVALID_VALUE,
		1468	"glCopyBufferSubData(overlapping src/dst)");
		1469	return;
		1470	}
		1471	}
		1472
		1473	ctx->Driver.CopyBufferSubData(ctx, src, dst, readOffset, writeOffset, size);
		1474	}
		1475
		1476
		1477	/**
		1478	* See GL_ARB_map_buffer_range spec
		1479	*/
		1480	void * GLAPIENTRY
		1481	_mesa_MapBufferRange(GLenum target, GLintptr offset, GLsizeiptr length,
		1482	GLbitfield access)
		1483	{
		1484	GET_CURRENT_CONTEXT(ctx);
		1485	struct gl_buffer_object *bufObj;
		1486	void *map;
		1487
		1488	ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, NULL);
		1489
		1490	if (!ctx->Extensions.ARB_map_buffer_range) {
		1491	_mesa_error(ctx, GL_INVALID_OPERATION,
		1492	"glMapBufferRange(extension not supported)");
		1493	return NULL;
		1494	}
		1495
		1496	if (offset < 0) {
		1497	_mesa_error(ctx, GL_INVALID_VALUE,
		1498	"glMapBufferRange(offset = %ld)", (long)offset);
		1499	return NULL;
		1500	}
		1501
		1502	if (length < 0) {
		1503	_mesa_error(ctx, GL_INVALID_VALUE,
		1504	"glMapBufferRange(length = %ld)", (long)length);
		1505	return NULL;
		1506	}
		1507
		1508	/* Page 38 of the PDF of the OpenGL ES 3.0 spec says:
		1509	*
		1510	* "An INVALID_OPERATION error is generated for any of the following
		1511	* conditions:
		1512	*
		1513	* * is zero."
		1514	*/
		1515	if (_mesa_is_gles(ctx) && length == 0) {
		1516	_mesa_error(ctx, GL_INVALID_OPERATION,
		1517	"glMapBufferRange(length = 0)");
		1518	return NULL;
		1519	}
		1520
		1521	if (access & ~(GL_MAP_READ_BIT \|
		1522	GL_MAP_WRITE_BIT \|
		1523	GL_MAP_INVALIDATE_RANGE_BIT \|
		1524	GL_MAP_INVALIDATE_BUFFER_BIT \|
		1525	GL_MAP_FLUSH_EXPLICIT_BIT \|
		1526	GL_MAP_UNSYNCHRONIZED_BIT)) {
		1527	/* generate an error if any undefind bit is set */
		1528	_mesa_error(ctx, GL_INVALID_VALUE, "glMapBufferRange(access)");
		1529	return NULL;
		1530	}
		1531
		1532	if ((access & (GL_MAP_READ_BIT \| GL_MAP_WRITE_BIT)) == 0) {
		1533	_mesa_error(ctx, GL_INVALID_OPERATION,
		1534	"glMapBufferRange(access indicates neither read or write)");
		1535	return NULL;
		1536	}
		1537
		1538	if ((access & GL_MAP_READ_BIT) &&
		1539	(access & (GL_MAP_INVALIDATE_RANGE_BIT \|
		1540	GL_MAP_INVALIDATE_BUFFER_BIT \|
		1541	GL_MAP_UNSYNCHRONIZED_BIT))) {
		1542	_mesa_error(ctx, GL_INVALID_OPERATION,
		1543	"glMapBufferRange(invalid access flags)");
		1544	return NULL;
		1545	}
		1546
		1547	if ((access & GL_MAP_FLUSH_EXPLICIT_BIT) &&
		1548	((access & GL_MAP_WRITE_BIT) == 0)) {
		1549	_mesa_error(ctx, GL_INVALID_OPERATION,
		1550	"glMapBufferRange(invalid access flags)");
		1551	return NULL;
		1552	}
		1553
		1554	bufObj = get_buffer(ctx, "glMapBufferRange", target);
		1555	if (!bufObj)
		1556	return NULL;
		1557
		1558	if (offset + length > bufObj->Size) {
		1559	_mesa_error(ctx, GL_INVALID_VALUE,
		1560	"glMapBufferRange(offset + length > size)");
		1561	return NULL;
		1562	}
		1563
		1564	if (_mesa_bufferobj_mapped(bufObj)) {
		1565	_mesa_error(ctx, GL_INVALID_OPERATION,
		1566	"glMapBufferRange(buffer already mapped)");
		1567	return NULL;
		1568	}
		1569
		1570	if (!bufObj->Size) {
		1571	_mesa_error(ctx, GL_OUT_OF_MEMORY,
		1572	"glMapBufferRange(buffer size = 0)");
		1573	return NULL;
		1574	}
		1575
		1576	/* Mapping zero bytes should return a non-null pointer. */
		1577	if (!length) {
		1578	static long dummy = 0;
		1579	bufObj->Pointer = &dummy;
		1580	bufObj->Length = length;
		1581	bufObj->Offset = offset;
		1582	bufObj->AccessFlags = access;
		1583	return bufObj->Pointer;
		1584	}
		1585
		1586	ASSERT(ctx->Driver.MapBufferRange);
		1587	map = ctx->Driver.MapBufferRange(ctx, offset, length, access, bufObj);
		1588	if (!map) {
		1589	_mesa_error(ctx, GL_OUT_OF_MEMORY, "glMapBufferARB(map failed)");
		1590	}
		1591	else {
		1592	/* The driver callback should have set all these fields.
		1593	* This is important because other modules (like VBO) might call
		1594	* the driver function directly.
		1595	*/
		1596	ASSERT(bufObj->Pointer == map);
		1597	ASSERT(bufObj->Length == length);
		1598	ASSERT(bufObj->Offset == offset);
		1599	ASSERT(bufObj->AccessFlags == access);
		1600	}
		1601
		1602	return map;
		1603	}
		1604
		1605
		1606	/**
		1607	* See GL_ARB_map_buffer_range spec
		1608	*/
		1609	void GLAPIENTRY
		1610	_mesa_FlushMappedBufferRange(GLenum target, GLintptr offset, GLsizeiptr length)
		1611	{
		1612	GET_CURRENT_CONTEXT(ctx);
		1613	struct gl_buffer_object *bufObj;
		1614
		1615	if (!ctx->Extensions.ARB_map_buffer_range) {
		1616	_mesa_error(ctx, GL_INVALID_OPERATION,
		1617	"glFlushMappedBufferRange(extension not supported)");
		1618	return;
		1619	}
		1620
		1621	if (offset < 0) {
		1622	_mesa_error(ctx, GL_INVALID_VALUE,
		1623	"glFlushMappedBufferRange(offset = %ld)", (long)offset);
		1624	return;
		1625	}
		1626
		1627	if (length < 0) {
		1628	_mesa_error(ctx, GL_INVALID_VALUE,
		1629	"glFlushMappedBufferRange(length = %ld)", (long)length);
		1630	return;
		1631	}
		1632
		1633	bufObj = get_buffer(ctx, "glFlushMappedBufferRange", target);
		1634	if (!bufObj)
		1635	return;
		1636
		1637	if (!_mesa_bufferobj_mapped(bufObj)) {
		1638	/* buffer is not mapped */
		1639	_mesa_error(ctx, GL_INVALID_OPERATION,
		1640	"glFlushMappedBufferRange(buffer is not mapped)");
		1641	return;
		1642	}
		1643
		1644	if ((bufObj->AccessFlags & GL_MAP_FLUSH_EXPLICIT_BIT) == 0) {
		1645	_mesa_error(ctx, GL_INVALID_OPERATION,
		1646	"glFlushMappedBufferRange(GL_MAP_FLUSH_EXPLICIT_BIT not set)");
		1647	return;
		1648	}
		1649
		1650	if (offset + length > bufObj->Length) {
		1651	_mesa_error(ctx, GL_INVALID_VALUE,
		1652	"glFlushMappedBufferRange(offset %ld + length %ld > mapped length %ld)",
		1653	(long)offset, (long)length, (long)bufObj->Length);
		1654	return;
		1655	}
		1656
		1657	ASSERT(bufObj->AccessFlags & GL_MAP_WRITE_BIT);
		1658
		1659	if (ctx->Driver.FlushMappedBufferRange)
		1660	ctx->Driver.FlushMappedBufferRange(ctx, offset, length, bufObj);
		1661	}
		1662
		1663
		1664	static GLenum
		1665	buffer_object_purgeable(struct gl_context *ctx, GLuint name, GLenum option)
		1666	{
		1667	struct gl_buffer_object *bufObj;
		1668	GLenum retval;
		1669
		1670	bufObj = _mesa_lookup_bufferobj(ctx, name);
		1671	if (!bufObj) {
		1672	_mesa_error(ctx, GL_INVALID_VALUE,
		1673	"glObjectPurgeable(name = 0x%x)", name);
		1674	return 0;
		1675	}
		1676	if (!_mesa_is_bufferobj(bufObj)) {
		1677	_mesa_error(ctx, GL_INVALID_OPERATION, "glObjectPurgeable(buffer 0)" );
		1678	return 0;
		1679	}
		1680
		1681	if (bufObj->Purgeable) {
		1682	_mesa_error(ctx, GL_INVALID_OPERATION,
		1683	"glObjectPurgeable(name = 0x%x) is already purgeable", name);
		1684	return GL_VOLATILE_APPLE;
		1685	}
		1686
		1687	bufObj->Purgeable = GL_TRUE;
		1688
		1689	retval = GL_VOLATILE_APPLE;
		1690	if (ctx->Driver.BufferObjectPurgeable)
		1691	retval = ctx->Driver.BufferObjectPurgeable(ctx, bufObj, option);
		1692
		1693	return retval;
		1694	}
		1695
		1696
		1697	static GLenum
		1698	renderbuffer_purgeable(struct gl_context *ctx, GLuint name, GLenum option)
		1699	{
		1700	struct gl_renderbuffer *bufObj;
		1701	GLenum retval;
		1702
		1703	bufObj = _mesa_lookup_renderbuffer(ctx, name);
		1704	if (!bufObj) {
		1705	_mesa_error(ctx, GL_INVALID_VALUE,
		1706	"glObjectUnpurgeable(name = 0x%x)", name);
		1707	return 0;
		1708	}
		1709
		1710	if (bufObj->Purgeable) {
		1711	_mesa_error(ctx, GL_INVALID_OPERATION,
		1712	"glObjectPurgeable(name = 0x%x) is already purgeable", name);
		1713	return GL_VOLATILE_APPLE;
		1714	}
		1715
		1716	bufObj->Purgeable = GL_TRUE;
		1717
		1718	retval = GL_VOLATILE_APPLE;
		1719	if (ctx->Driver.RenderObjectPurgeable)
		1720	retval = ctx->Driver.RenderObjectPurgeable(ctx, bufObj, option);
		1721
		1722	return retval;
		1723	}
		1724
		1725
		1726	static GLenum
		1727	texture_object_purgeable(struct gl_context *ctx, GLuint name, GLenum option)
		1728	{
		1729	struct gl_texture_object *bufObj;
		1730	GLenum retval;
		1731
		1732	bufObj = _mesa_lookup_texture(ctx, name);
		1733	if (!bufObj) {
		1734	_mesa_error(ctx, GL_INVALID_VALUE,
		1735	"glObjectPurgeable(name = 0x%x)", name);
		1736	return 0;
		1737	}
		1738
		1739	if (bufObj->Purgeable) {
		1740	_mesa_error(ctx, GL_INVALID_OPERATION,
		1741	"glObjectPurgeable(name = 0x%x) is already purgeable", name);
		1742	return GL_VOLATILE_APPLE;
		1743	}
		1744
		1745	bufObj->Purgeable = GL_TRUE;
		1746
		1747	retval = GL_VOLATILE_APPLE;
		1748	if (ctx->Driver.TextureObjectPurgeable)
		1749	retval = ctx->Driver.TextureObjectPurgeable(ctx, bufObj, option);
		1750
		1751	return retval;
		1752	}
		1753
		1754
		1755	GLenum GLAPIENTRY
		1756	_mesa_ObjectPurgeableAPPLE(GLenum objectType, GLuint name, GLenum option)
		1757	{
		1758	GLenum retval;
		1759
		1760	GET_CURRENT_CONTEXT(ctx);
		1761	ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, 0);
		1762
		1763	if (name == 0) {
		1764	_mesa_error(ctx, GL_INVALID_VALUE,
		1765	"glObjectPurgeable(name = 0x%x)", name);
		1766	return 0;
		1767	}
		1768
		1769	switch (option) {
		1770	case GL_VOLATILE_APPLE:
		1771	case GL_RELEASED_APPLE:
		1772	/* legal */
		1773	break;
		1774	default:
		1775	_mesa_error(ctx, GL_INVALID_ENUM,
		1776	"glObjectPurgeable(name = 0x%x) invalid option: %d",
		1777	name, option);
		1778	return 0;
		1779	}
		1780
		1781	switch (objectType) {
		1782	case GL_TEXTURE:
		1783	retval = texture_object_purgeable(ctx, name, option);
		1784	break;
		1785	case GL_RENDERBUFFER_EXT:
		1786	retval = renderbuffer_purgeable(ctx, name, option);
		1787	break;
		1788	case GL_BUFFER_OBJECT_APPLE:
		1789	retval = buffer_object_purgeable(ctx, name, option);
		1790	break;
		1791	default:
		1792	_mesa_error(ctx, GL_INVALID_ENUM,
		1793	"glObjectPurgeable(name = 0x%x) invalid type: %d",
		1794	name, objectType);
		1795	return 0;
		1796	}
		1797
		1798	/* In strict conformance to the spec, we must only return VOLATILE when
		1799	* when passed the VOLATILE option. Madness.
		1800	*
		1801	* XXX First fix the spec, then fix me.
		1802	*/
		1803	return option == GL_VOLATILE_APPLE ? GL_VOLATILE_APPLE : retval;
		1804	}
		1805
		1806
		1807	static GLenum
		1808	buffer_object_unpurgeable(struct gl_context *ctx, GLuint name, GLenum option)
		1809	{
		1810	struct gl_buffer_object *bufObj;
		1811	GLenum retval;
		1812
		1813	bufObj = _mesa_lookup_bufferobj(ctx, name);
		1814	if (!bufObj) {
		1815	_mesa_error(ctx, GL_INVALID_VALUE,
		1816	"glObjectUnpurgeable(name = 0x%x)", name);
		1817	return 0;
		1818	}
		1819
		1820	if (! bufObj->Purgeable) {
		1821	_mesa_error(ctx, GL_INVALID_OPERATION,
		1822	"glObjectUnpurgeable(name = 0x%x) object is "
		1823	" already \"unpurged\"", name);
		1824	return 0;
		1825	}
		1826
		1827	bufObj->Purgeable = GL_FALSE;
		1828
		1829	retval = option;
		1830	if (ctx->Driver.BufferObjectUnpurgeable)
		1831	retval = ctx->Driver.BufferObjectUnpurgeable(ctx, bufObj, option);
		1832
		1833	return retval;
		1834	}
		1835
		1836
		1837	static GLenum
		1838	renderbuffer_unpurgeable(struct gl_context *ctx, GLuint name, GLenum option)
		1839	{
		1840	struct gl_renderbuffer *bufObj;
		1841	GLenum retval;
		1842
		1843	bufObj = _mesa_lookup_renderbuffer(ctx, name);
		1844	if (!bufObj) {
		1845	_mesa_error(ctx, GL_INVALID_VALUE,
		1846	"glObjectUnpurgeable(name = 0x%x)", name);
		1847	return 0;
		1848	}
		1849
		1850	if (! bufObj->Purgeable) {
		1851	_mesa_error(ctx, GL_INVALID_OPERATION,
		1852	"glObjectUnpurgeable(name = 0x%x) object is "
		1853	" already \"unpurged\"", name);
		1854	return 0;
		1855	}
		1856
		1857	bufObj->Purgeable = GL_FALSE;
		1858
		1859	retval = option;
		1860	if (ctx->Driver.RenderObjectUnpurgeable)
		1861	retval = ctx->Driver.RenderObjectUnpurgeable(ctx, bufObj, option);
		1862
		1863	return retval;
		1864	}
		1865
		1866
		1867	static GLenum
		1868	texture_object_unpurgeable(struct gl_context *ctx, GLuint name, GLenum option)
		1869	{
		1870	struct gl_texture_object *bufObj;
		1871	GLenum retval;
		1872
		1873	bufObj = _mesa_lookup_texture(ctx, name);
		1874	if (!bufObj) {
		1875	_mesa_error(ctx, GL_INVALID_VALUE,
		1876	"glObjectUnpurgeable(name = 0x%x)", name);
		1877	return 0;
		1878	}
		1879
		1880	if (! bufObj->Purgeable) {
		1881	_mesa_error(ctx, GL_INVALID_OPERATION,
		1882	"glObjectUnpurgeable(name = 0x%x) object is"
		1883	" already \"unpurged\"", name);
		1884	return 0;
		1885	}
		1886
		1887	bufObj->Purgeable = GL_FALSE;
		1888
		1889	retval = option;
		1890	if (ctx->Driver.TextureObjectUnpurgeable)
		1891	retval = ctx->Driver.TextureObjectUnpurgeable(ctx, bufObj, option);
		1892
		1893	return retval;
		1894	}
		1895
		1896
		1897	GLenum GLAPIENTRY
		1898	_mesa_ObjectUnpurgeableAPPLE(GLenum objectType, GLuint name, GLenum option)
		1899	{
		1900	GET_CURRENT_CONTEXT(ctx);
		1901	ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, 0);
		1902
		1903	if (name == 0) {
		1904	_mesa_error(ctx, GL_INVALID_VALUE,
		1905	"glObjectUnpurgeable(name = 0x%x)", name);
		1906	return 0;
		1907	}
		1908
		1909	switch (option) {
		1910	case GL_RETAINED_APPLE:
		1911	case GL_UNDEFINED_APPLE:
		1912	/* legal */
		1913	break;
		1914	default:
		1915	_mesa_error(ctx, GL_INVALID_ENUM,
		1916	"glObjectUnpurgeable(name = 0x%x) invalid option: %d",
		1917	name, option);
		1918	return 0;
		1919	}
		1920
		1921	switch (objectType) {
		1922	case GL_BUFFER_OBJECT_APPLE:
		1923	return buffer_object_unpurgeable(ctx, name, option);
		1924	case GL_TEXTURE:
		1925	return texture_object_unpurgeable(ctx, name, option);
		1926	case GL_RENDERBUFFER_EXT:
		1927	return renderbuffer_unpurgeable(ctx, name, option);
		1928	default:
		1929	_mesa_error(ctx, GL_INVALID_ENUM,
		1930	"glObjectUnpurgeable(name = 0x%x) invalid type: %d",
		1931	name, objectType);
		1932	return 0;
		1933	}
		1934	}
		1935
		1936
		1937	static void
		1938	get_buffer_object_parameteriv(struct gl_context *ctx, GLuint name,
		1939	GLenum pname, GLint *params)
		1940	{
		1941	struct gl_buffer_object *bufObj = _mesa_lookup_bufferobj(ctx, name);
		1942	if (!bufObj) {
		1943	_mesa_error(ctx, GL_INVALID_VALUE,
		1944	"glGetObjectParameteriv(name = 0x%x) invalid object", name);
		1945	return;
		1946	}
		1947
		1948	switch (pname) {
		1949	case GL_PURGEABLE_APPLE:
		1950	*params = bufObj->Purgeable;
		1951	break;
		1952	default:
		1953	_mesa_error(ctx, GL_INVALID_ENUM,
		1954	"glGetObjectParameteriv(name = 0x%x) invalid enum: %d",
		1955	name, pname);
		1956	break;
		1957	}
		1958	}
		1959
		1960
		1961	static void
		1962	get_renderbuffer_parameteriv(struct gl_context *ctx, GLuint name,
		1963	GLenum pname, GLint *params)
		1964	{
		1965	struct gl_renderbuffer *rb = _mesa_lookup_renderbuffer(ctx, name);
		1966	if (!rb) {
		1967	_mesa_error(ctx, GL_INVALID_VALUE,
		1968	"glObjectUnpurgeable(name = 0x%x)", name);
		1969	return;
		1970	}
		1971
		1972	switch (pname) {
		1973	case GL_PURGEABLE_APPLE:
		1974	*params = rb->Purgeable;
		1975	break;
		1976	default:
		1977	_mesa_error(ctx, GL_INVALID_ENUM,
		1978	"glGetObjectParameteriv(name = 0x%x) invalid enum: %d",
		1979	name, pname);
		1980	break;
		1981	}
		1982	}
		1983
		1984
		1985	static void
		1986	get_texture_object_parameteriv(struct gl_context *ctx, GLuint name,
		1987	GLenum pname, GLint *params)
		1988	{
		1989	struct gl_texture_object *texObj = _mesa_lookup_texture(ctx, name);
		1990	if (!texObj) {
		1991	_mesa_error(ctx, GL_INVALID_VALUE,
		1992	"glObjectUnpurgeable(name = 0x%x)", name);
		1993	return;
		1994	}
		1995
		1996	switch (pname) {
		1997	case GL_PURGEABLE_APPLE:
		1998	*params = texObj->Purgeable;
		1999	break;
		2000	default:
		2001	_mesa_error(ctx, GL_INVALID_ENUM,
		2002	"glGetObjectParameteriv(name = 0x%x) invalid enum: %d",
		2003	name, pname);
		2004	break;
		2005	}
		2006	}
		2007
		2008
		2009	void GLAPIENTRY
		2010	_mesa_GetObjectParameterivAPPLE(GLenum objectType, GLuint name, GLenum pname,
		2011	GLint *params)
		2012	{
		2013	GET_CURRENT_CONTEXT(ctx);
		2014
		2015	if (name == 0) {
		2016	_mesa_error(ctx, GL_INVALID_VALUE,
		2017	"glGetObjectParameteriv(name = 0x%x)", name);
		2018	return;
		2019	}
		2020
		2021	switch (objectType) {
		2022	case GL_TEXTURE:
		2023	get_texture_object_parameteriv(ctx, name, pname, params);
		2024	break;
		2025	case GL_BUFFER_OBJECT_APPLE:
		2026	get_buffer_object_parameteriv(ctx, name, pname, params);
		2027	break;
		2028	case GL_RENDERBUFFER_EXT:
		2029	get_renderbuffer_parameteriv(ctx, name, pname, params);
		2030	break;
		2031	default:
		2032	_mesa_error(ctx, GL_INVALID_ENUM,
		2033	"glGetObjectParameteriv(name = 0x%x) invalid type: %d",
		2034	name, objectType);
		2035	}
		2036	}
		2037
		2038	static void
		2039	set_ubo_binding(struct gl_context *ctx,
		2040	int index,
		2041	struct gl_buffer_object *bufObj,
		2042	GLintptr offset,
		2043	GLsizeiptr size,
		2044	GLboolean autoSize)
		2045	{
		2046	struct gl_uniform_buffer_binding *binding;
		2047
		2048	binding = &ctx->UniformBufferBindings[index];
		2049	if (binding->BufferObject == bufObj &&
		2050	binding->Offset == offset &&
		2051	binding->Size == size &&
		2052	binding->AutomaticSize == autoSize) {
		2053	return;
		2054	}
		2055
		2056	FLUSH_VERTICES(ctx, 0);
		2057	ctx->NewDriverState \|= ctx->DriverFlags.NewUniformBuffer;
		2058
		2059	_mesa_reference_buffer_object(ctx, &binding->BufferObject, bufObj);
		2060	binding->Offset = offset;
		2061	binding->Size = size;
		2062	binding->AutomaticSize = autoSize;
		2063	}
		2064
		2065	/**
		2066	* Bind a region of a buffer object to a uniform block binding point.
		2067	* \param index the uniform buffer binding point index
		2068	* \param bufObj the buffer object
		2069	* \param offset offset to the start of buffer object region
		2070	* \param size size of the buffer object region
		2071	*/
		2072	static void
		2073	bind_buffer_range_uniform_buffer(struct gl_context *ctx,
		2074	GLuint index,
		2075	struct gl_buffer_object *bufObj,
		2076	GLintptr offset,
		2077	GLsizeiptr size)
		2078	{
		2079	if (index >= ctx->Const.MaxUniformBufferBindings) {
		2080	_mesa_error(ctx, GL_INVALID_VALUE, "glBindBufferRange(index=%d)", index);
		2081	return;
		2082	}
		2083
		2084	if (offset & (ctx->Const.UniformBufferOffsetAlignment - 1)) {
		2085	_mesa_error(ctx, GL_INVALID_VALUE,
		2086	"glBindBufferRange(offset misalgned %d/%d)", (int) offset,
		2087	ctx->Const.UniformBufferOffsetAlignment);
		2088	return;
		2089	}
		2090
		2091	if (bufObj == ctx->Shared->NullBufferObj) {
		2092	offset = -1;
		2093	size = -1;
		2094	}
		2095
		2096	_mesa_reference_buffer_object(ctx, &ctx->UniformBuffer, bufObj);
		2097	set_ubo_binding(ctx, index, bufObj, offset, size, GL_FALSE);
		2098	}
		2099
		2100
		2101	/**
		2102	* Bind a buffer object to a uniform block binding point.
		2103	* As above, but offset = 0.
		2104	*/
		2105	static void
		2106	bind_buffer_base_uniform_buffer(struct gl_context *ctx,
		2107	GLuint index,
		2108	struct gl_buffer_object *bufObj)
		2109	{
		2110	if (index >= ctx->Const.MaxUniformBufferBindings) {
		2111	_mesa_error(ctx, GL_INVALID_VALUE, "glBindBufferBase(index=%d)", index);
		2112	return;
		2113	}
		2114
		2115	_mesa_reference_buffer_object(ctx, &ctx->UniformBuffer, bufObj);
		2116	if (bufObj == ctx->Shared->NullBufferObj)
		2117	set_ubo_binding(ctx, index, bufObj, -1, -1, GL_TRUE);
		2118	else
		2119	set_ubo_binding(ctx, index, bufObj, 0, 0, GL_TRUE);
		2120	}
		2121
		2122	void GLAPIENTRY
		2123	_mesa_BindBufferRange(GLenum target, GLuint index,
		2124	GLuint buffer, GLintptr offset, GLsizeiptr size)
		2125	{
		2126	GET_CURRENT_CONTEXT(ctx);
		2127	struct gl_buffer_object *bufObj;
		2128
		2129	if (buffer == 0) {
		2130	bufObj = ctx->Shared->NullBufferObj;
		2131	} else {
		2132	bufObj = _mesa_lookup_bufferobj(ctx, buffer);
		2133	}
		2134	if (!handle_bind_buffer_gen(ctx, target, buffer, &bufObj))
		2135	return;
		2136
		2137	if (!bufObj) {
		2138	_mesa_error(ctx, GL_INVALID_OPERATION,
		2139	"glBindBufferRange(invalid buffer=%u)", buffer);
		2140	return;
		2141	}
		2142
		2143	if (buffer != 0) {
		2144	if (size <= 0) {
		2145	_mesa_error(ctx, GL_INVALID_VALUE, "glBindBufferRange(size=%d)",
		2146	(int) size);
		2147	return;
		2148	}
		2149	}
		2150
		2151	switch (target) {
		2152	case GL_TRANSFORM_FEEDBACK_BUFFER:
		2153	_mesa_bind_buffer_range_transform_feedback(ctx, index, bufObj,
		2154	offset, size);
		2155	return;
		2156	case GL_UNIFORM_BUFFER:
		2157	bind_buffer_range_uniform_buffer(ctx, index, bufObj, offset, size);
		2158	return;
		2159	default:
		2160	_mesa_error(ctx, GL_INVALID_ENUM, "glBindBufferRange(target)");
		2161	return;
		2162	}
		2163	}
		2164
		2165	void GLAPIENTRY
		2166	_mesa_BindBufferBase(GLenum target, GLuint index, GLuint buffer)
		2167	{
		2168	GET_CURRENT_CONTEXT(ctx);
		2169	struct gl_buffer_object *bufObj;
		2170
		2171	if (buffer == 0) {
		2172	bufObj = ctx->Shared->NullBufferObj;
		2173	} else {
		2174	bufObj = _mesa_lookup_bufferobj(ctx, buffer);
		2175	}
		2176	if (!handle_bind_buffer_gen(ctx, target, buffer, &bufObj))
		2177	return;
		2178
		2179	if (!bufObj) {
		2180	_mesa_error(ctx, GL_INVALID_OPERATION,
		2181	"glBindBufferBase(invalid buffer=%u)", buffer);
		2182	return;
		2183	}
		2184
		2185	/* Note that there's some oddness in the GL 3.1-GL 3.3 specifications with
		2186	* regards to BindBufferBase. It says (GL 3.1 core spec, page 63):
		2187	*
		2188	* "BindBufferBase is equivalent to calling BindBufferRange with offset
		2189	* zero and size equal to the size of buffer."
		2190	*
		2191	* but it says for glGetIntegeri_v (GL 3.1 core spec, page 230):
		2192	*
		2193	* "If the parameter (starting offset or size) was not specified when the
		2194	* buffer object was bound, zero is returned."
		2195	*
		2196	* What happens if the size of the buffer changes? Does the size of the
		2197	* buffer at the moment glBindBufferBase was called still play a role, like
		2198	* the first quote would imply, or is the size meaningless in the
		2199	* glBindBufferBase case like the second quote would suggest? The GL 4.1
		2200	* core spec page 45 says:
		2201	*
		2202	* "It is equivalent to calling BindBufferRange with offset zero, while
		2203	* size is determined by the size of the bound buffer at the time the
		2204	* binding is used."
		2205	*
		2206	* My interpretation is that the GL 4.1 spec was a clarification of the
		2207	* behavior, not a change. In particular, this choice will only make
		2208	* rendering work in cases where it would have had undefined results.
		2209	*/
		2210
		2211	switch (target) {
		2212	case GL_TRANSFORM_FEEDBACK_BUFFER:
		2213	_mesa_bind_buffer_base_transform_feedback(ctx, index, bufObj);
		2214	return;
		2215	case GL_UNIFORM_BUFFER:
		2216	bind_buffer_base_uniform_buffer(ctx, index, bufObj);
		2217	return;
		2218	default:
		2219	_mesa_error(ctx, GL_INVALID_ENUM, "glBindBufferBase(target)");
		2220	return;
		2221	}
		2222	}
		2223
		2224	void GLAPIENTRY
		2225	_mesa_InvalidateBufferSubData(GLuint buffer, GLintptr offset,
		2226	GLsizeiptr length)
		2227	{
		2228	GET_CURRENT_CONTEXT(ctx);
		2229	struct gl_buffer_object *bufObj;
		2230	const GLintptr end = offset + length;
		2231
		2232	bufObj = _mesa_lookup_bufferobj(ctx, buffer);
		2233	if (!bufObj) {
		2234	_mesa_error(ctx, GL_INVALID_VALUE,
		2235	"glInvalidateBufferSubData(name = 0x%x) invalid object",
		2236	buffer);
		2237	return;
		2238	}
		2239
		2240	/* The GL_ARB_invalidate_subdata spec says:
		2241	*
		2242	* "An INVALID_VALUE error is generated if or is
		2243	* negative, or if + is greater than the value of
		2244	* BUFFER_SIZE."
		2245	*/
		2246	if (end < 0 \|\| end > bufObj->Size) {
		2247	_mesa_error(ctx, GL_INVALID_VALUE,
		2248	"glInvalidateBufferSubData(invalid offset or length)");
		2249	return;
		2250	}
		2251
		2252	/* The GL_ARB_invalidate_subdata spec says:
		2253	*
		2254	* "An INVALID_OPERATION error is generated if the buffer is currently
		2255	* mapped by MapBuffer, or if the invalidate range intersects the range
		2256	* currently mapped by MapBufferRange."
		2257	*/
		2258	if (_mesa_bufferobj_mapped(bufObj)) {
		2259	const GLintptr mapEnd = bufObj->Offset + bufObj->Length;
		2260
		2261	/* The regions do not overlap if and only if the end of the discard
		2262	* region is before the mapped region or the start of the discard region
		2263	* is after the mapped region.
		2264	*
		2265	* Note that 'end' and 'mapEnd' are the first byte after the discard
		2266	* region and the mapped region, repsectively. It is okay for that byte
		2267	* to be mapped (for 'end') or discarded (for 'mapEnd').
		2268	*/
		2269	if (!(end <= bufObj->Offset \|\| offset >= mapEnd)) {
		2270	_mesa_error(ctx, GL_INVALID_OPERATION,
		2271	"glInvalidateBufferSubData(intersection with mapped "
		2272	"range)");
		2273	return;
		2274	}
		2275	}
		2276
		2277	/* We don't actually do anything for this yet. Just return after
		2278	* validating the parameters and generating the required errors.
		2279	*/
		2280	return;
		2281	}
		2282
		2283	void GLAPIENTRY
		2284	_mesa_InvalidateBufferData(GLuint buffer)
		2285	{
		2286	GET_CURRENT_CONTEXT(ctx);
		2287	struct gl_buffer_object *bufObj;
		2288
		2289	bufObj = _mesa_lookup_bufferobj(ctx, buffer);
		2290	if (!bufObj) {
		2291	_mesa_error(ctx, GL_INVALID_VALUE,
		2292	"glInvalidateBufferData(name = 0x%x) invalid object",
		2293	buffer);
		2294	return;
		2295	}
		2296
		2297	/* The GL_ARB_invalidate_subdata spec says:
		2298	*
		2299	* "An INVALID_OPERATION error is generated if the buffer is currently
		2300	* mapped by MapBuffer, or if the invalidate range intersects the range
		2301	* currently mapped by MapBufferRange."
		2302	*/
		2303	if (_mesa_bufferobj_mapped(bufObj)) {
		2304	_mesa_error(ctx, GL_INVALID_OPERATION,
		2305	"glInvalidateBufferData(intersection with mapped "
		2306	"range)");
		2307	return;
		2308	}
		2309
		2310	/* We don't actually do anything for this yet. Just return after
		2311	* validating the parameters and generating the required errors.
		2312	*/
		2313	return;
		2314	}

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(root)/contrib/sdk/sources/Mesa/src/mesa/main/bufferobj.c – Rev 4358