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reactos/dll/opengl/mesa/main/bufferobj.c

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/*
* Mesa 3-D graphics library
* Version: 7.6
*
* Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
* Copyright (C) 2009 VMware, Inc. All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/**
* \file bufferobj.c
* \brief Functions for the GL_ARB_vertex/pixel_buffer_object extensions.
* \author Brian Paul, Ian Romanick
*/
#include <precomp.h>
/* Debug flags */
/*#define VBO_DEBUG*/
/*#define BOUNDS_CHECK*/
/**
* Used as a placeholder for buffer objects between glGenBuffers() and
* glBindBuffer() so that glIsBuffer() can work correctly.
*/
static struct gl_buffer_object DummyBufferObject;
/**
* Return pointer to address of a buffer object target.
* \param ctx the GL context
* \param target the buffer object target to be retrieved.
* \return pointer to pointer to the buffer object bound to \c target in the
* specified context or \c NULL if \c target is invalid.
*/
static inline struct gl_buffer_object **
get_buffer_target(struct gl_context *ctx, GLenum target)
{
switch (target) {
case GL_ELEMENT_ARRAY_BUFFER_ARB:
return &ctx->Array.ElementArrayBufferObj;
default:
return NULL;
}
return NULL;
}
/**
* Get the buffer object bound to the specified target in a GL context.
* \param ctx the GL context
* \param target the buffer object target to be retrieved.
* \return pointer to the buffer object bound to \c target in the
* specified context or \c NULL if \c target is invalid.
*/
static inline struct gl_buffer_object *
get_buffer(struct gl_context *ctx, const char *func, GLenum target)
{
struct gl_buffer_object **bufObj = get_buffer_target(ctx, target);
if (!bufObj) {
_mesa_error(ctx, GL_INVALID_ENUM, "%s(target)", func);
return NULL;
}
if (!_mesa_is_bufferobj(*bufObj)) {
_mesa_error(ctx, GL_INVALID_OPERATION, "%s(buffer 0)", func);
return NULL;
}
return *bufObj;
}
static inline GLenum
default_access_mode(const struct gl_context *ctx)
{
(void)ctx;
return GL_MAP_READ_BIT | GL_MAP_WRITE_BIT;
}
/**
* Convert a GLbitfield describing the mapped buffer access flags
* into one of GL_READ_WRITE, GL_READ_ONLY, or GL_WRITE_ONLY.
*/
static GLenum
simplified_access_mode(GLbitfield access)
{
const GLbitfield rwFlags = GL_MAP_READ_BIT | GL_MAP_WRITE_BIT;
if ((access & rwFlags) == rwFlags)
return GL_READ_WRITE;
if ((access & GL_MAP_READ_BIT) == GL_MAP_READ_BIT)
return GL_READ_ONLY;
if ((access & GL_MAP_WRITE_BIT) == GL_MAP_WRITE_BIT)
return GL_WRITE_ONLY;
return GL_READ_WRITE; /* this should never happen, but no big deal */
}
/**
* Tests the subdata range parameters and sets the GL error code for
* \c glBufferSubDataARB and \c glGetBufferSubDataARB.
*
* \param ctx GL context.
* \param target Buffer object target on which to operate.
* \param offset Offset of the first byte of the subdata range.
* \param size Size, in bytes, of the subdata range.
* \param caller Name of calling function for recording errors.
* \return A pointer to the buffer object bound to \c target in the
* specified context or \c NULL if any of the parameter or state
* conditions for \c glBufferSubDataARB or \c glGetBufferSubDataARB
* are invalid.
*
* \sa glBufferSubDataARB, glGetBufferSubDataARB
*/
static struct gl_buffer_object *
buffer_object_subdata_range_good( struct gl_context * ctx, GLenum target,
GLintptrARB offset, GLsizeiptrARB size,
const char *caller )
{
struct gl_buffer_object *bufObj;
if (size < 0) {
_mesa_error(ctx, GL_INVALID_VALUE, "%s(size < 0)", caller);
return NULL;
}
if (offset < 0) {
_mesa_error(ctx, GL_INVALID_VALUE, "%s(offset < 0)", caller);
return NULL;
}
bufObj = get_buffer(ctx, caller, target);
if (!bufObj)
return NULL;
if (offset + size > bufObj->Size) {
_mesa_error(ctx, GL_INVALID_VALUE,
"%s(offset %lu + size %lu > buffer size %lu)", caller,
(unsigned long) offset,
(unsigned long) size,
(unsigned long) bufObj->Size);
return NULL;
}
if (_mesa_bufferobj_mapped(bufObj)) {
/* Buffer is currently mapped */
_mesa_error(ctx, GL_INVALID_OPERATION, "%s", caller);
return NULL;
}
return bufObj;
}
/**
* Allocate and initialize a new buffer object.
*
* Default callback for the \c dd_function_table::NewBufferObject() hook.
*/
static struct gl_buffer_object *
_mesa_new_buffer_object( struct gl_context *ctx, GLuint name, GLenum target )
{
struct gl_buffer_object *obj;
(void) ctx;
obj = MALLOC_STRUCT(gl_buffer_object);
_mesa_initialize_buffer_object(ctx, obj, name, target);
return obj;
}
/**
* Delete a buffer object.
*
* Default callback for the \c dd_function_table::DeleteBuffer() hook.
*/
static void
_mesa_delete_buffer_object(struct gl_context *ctx,
struct gl_buffer_object *bufObj)
{
(void) ctx;
if (bufObj->Data)
free(bufObj->Data);
/* assign strange values here to help w/ debugging */
bufObj->RefCount = -1000;
bufObj->Name = ~0;
_glthread_DESTROY_MUTEX(bufObj->Mutex);
free(bufObj);
}
/**
* Set ptr to bufObj w/ reference counting.
* This is normally only called from the _mesa_reference_buffer_object() macro
* when there's a real pointer change.
*/
void
_mesa_reference_buffer_object_(struct gl_context *ctx,
struct gl_buffer_object **ptr,
struct gl_buffer_object *bufObj)
{
if (*ptr) {
/* Unreference the old buffer */
GLboolean deleteFlag = GL_FALSE;
struct gl_buffer_object *oldObj = *ptr;
_glthread_LOCK_MUTEX(oldObj->Mutex);
ASSERT(oldObj->RefCount > 0);
oldObj->RefCount--;
#if 0
printf("BufferObj %p %d DECR to %d\n",
(void *) oldObj, oldObj->Name, oldObj->RefCount);
#endif
deleteFlag = (oldObj->RefCount == 0);
_glthread_UNLOCK_MUTEX(oldObj->Mutex);
if (deleteFlag) {
/* some sanity checking: don't delete a buffer still in use */
#if 0
/* unfortunately, these tests are invalid during context tear-down */
ASSERT(ctx->Array.ArrayBufferObj != bufObj);
ASSERT(ctx->Array.ArrayObj->ElementArrayBufferObj != bufObj);
ASSERT(ctx->Array.ArrayObj->Vertex.BufferObj != bufObj);
#endif
ASSERT(ctx->Driver.DeleteBuffer);
ctx->Driver.DeleteBuffer(ctx, oldObj);
}
*ptr = NULL;
}
ASSERT(!*ptr);
if (bufObj) {
/* reference new buffer */
_glthread_LOCK_MUTEX(bufObj->Mutex);
if (bufObj->RefCount == 0) {
/* this buffer's being deleted (look just above) */
/* Not sure this can every really happen. Warn if it does. */
_mesa_problem(NULL, "referencing deleted buffer object");
*ptr = NULL;
}
else {
bufObj->RefCount++;
#if 0
printf("BufferObj %p %d INCR to %d\n",
(void *) bufObj, bufObj->Name, bufObj->RefCount);
#endif
*ptr = bufObj;
}
_glthread_UNLOCK_MUTEX(bufObj->Mutex);
}
}
/**
* Initialize a buffer object to default values.
*/
void
_mesa_initialize_buffer_object( struct gl_context *ctx,
struct gl_buffer_object *obj,
GLuint name, GLenum target )
{
(void) target;
memset(obj, 0, sizeof(struct gl_buffer_object));
_glthread_INIT_MUTEX(obj->Mutex);
obj->RefCount = 1;
obj->Name = name;
obj->Usage = GL_STATIC_DRAW_ARB;
obj->AccessFlags = default_access_mode(ctx);
}
/**
* Allocate space for and store data in a buffer object. Any data that was
* previously stored in the buffer object is lost. If \c data is \c NULL,
* memory will be allocated, but no copy will occur.
*
* This is the default callback for \c dd_function_table::BufferData()
* Note that all GL error checking will have been done already.
*
* \param ctx GL context.
* \param target Buffer object target on which to operate.
* \param size Size, in bytes, of the new data store.
* \param data Pointer to the data to store in the buffer object. This
* pointer may be \c NULL.
* \param usage Hints about how the data will be used.
* \param bufObj Object to be used.
*
* \return GL_TRUE for success, GL_FALSE for failure
* \sa glBufferDataARB, dd_function_table::BufferData.
*/
static GLboolean
_mesa_buffer_data( struct gl_context *ctx, GLenum target, GLsizeiptrARB size,
const GLvoid * data, GLenum usage,
struct gl_buffer_object * bufObj )
{
void * new_data;
(void) ctx; (void) target;
new_data = _mesa_realloc( bufObj->Data, bufObj->Size, size );
if (new_data) {
bufObj->Data = (GLubyte *) new_data;
bufObj->Size = size;
bufObj->Usage = usage;
if (data) {
memcpy( bufObj->Data, data, size );
}
return GL_TRUE;
}
else {
return GL_FALSE;
}
}
/**
* Replace data in a subrange of buffer object. If the data range
* specified by \c size + \c offset extends beyond the end of the buffer or
* if \c data is \c NULL, no copy is performed.
*
* This is the default callback for \c dd_function_table::BufferSubData()
* Note that all GL error checking will have been done already.
*
* \param ctx GL context.
* \param target Buffer object target on which to operate.
* \param offset Offset of the first byte to be modified.
* \param size Size, in bytes, of the data range.
* \param data Pointer to the data to store in the buffer object.
* \param bufObj Object to be used.
*
* \sa glBufferSubDataARB, dd_function_table::BufferSubData.
*/
static void
_mesa_buffer_subdata( struct gl_context *ctx, GLintptrARB offset,
GLsizeiptrARB size, const GLvoid * data,
struct gl_buffer_object * bufObj )
{
(void) ctx;
/* this should have been caught in _mesa_BufferSubData() */
ASSERT(size + offset <= bufObj->Size);
if (bufObj->Data) {
memcpy( (GLubyte *) bufObj->Data + offset, data, size );
}
}
/**
* Retrieve data from a subrange of buffer object. If the data range
* specified by \c size + \c offset extends beyond the end of the buffer or
* if \c data is \c NULL, no copy is performed.
*
* This is the default callback for \c dd_function_table::GetBufferSubData()
* Note that all GL error checking will have been done already.
*
* \param ctx GL context.
* \param target Buffer object target on which to operate.
* \param offset Offset of the first byte to be fetched.
* \param size Size, in bytes, of the data range.
* \param data Destination for data
* \param bufObj Object to be used.
*
* \sa glBufferGetSubDataARB, dd_function_table::GetBufferSubData.
*/
static void
_mesa_buffer_get_subdata( struct gl_context *ctx, GLintptrARB offset,
GLsizeiptrARB size, GLvoid * data,
struct gl_buffer_object * bufObj )
{
(void) ctx;
if (bufObj->Data && ((GLsizeiptrARB) (size + offset) <= bufObj->Size)) {
memcpy( data, (GLubyte *) bufObj->Data + offset, size );
}
}
/**
* Default fallback for \c dd_function_table::MapBufferRange().
* Called via glMapBufferRange().
*/
static void *
_mesa_buffer_map_range( struct gl_context *ctx, GLintptr offset,
GLsizeiptr length, GLbitfield access,
struct gl_buffer_object *bufObj )
{
(void) ctx;
assert(!_mesa_bufferobj_mapped(bufObj));
/* Just return a direct pointer to the data */
bufObj->Pointer = bufObj->Data + offset;
bufObj->Length = length;
bufObj->Offset = offset;
bufObj->AccessFlags = access;
return bufObj->Pointer;
}
/**
* Default fallback for \c dd_function_table::FlushMappedBufferRange().
* Called via glFlushMappedBufferRange().
*/
static void
_mesa_buffer_flush_mapped_range( struct gl_context *ctx,
GLintptr offset, GLsizeiptr length,
struct gl_buffer_object *obj )
{
(void) ctx;
(void) offset;
(void) length;
(void) obj;
/* no-op */
}
/**
* Default callback for \c dd_function_table::MapBuffer().
*
* The input parameters will have been already tested for errors.
*
* \sa glUnmapBufferARB, dd_function_table::UnmapBuffer
*/
static GLboolean
_mesa_buffer_unmap( struct gl_context *ctx, struct gl_buffer_object *bufObj )
{
(void) ctx;
/* XXX we might assert here that bufObj->Pointer is non-null */
bufObj->Pointer = NULL;
bufObj->Length = 0;
bufObj->Offset = 0;
bufObj->AccessFlags = 0x0;
return GL_TRUE;
}
/**
* Initialize the state associated with buffer objects
*/
void
_mesa_init_buffer_objects( struct gl_context *ctx )
{
memset(&DummyBufferObject, 0, sizeof(DummyBufferObject));
_glthread_INIT_MUTEX(DummyBufferObject.Mutex);
DummyBufferObject.RefCount = 1000*1000*1000; /* never delete */
}
/**
* Bind the specified target to buffer for the specified context.
* Called by glBindBuffer() and other functions.
*/
static void
bind_buffer_object(struct gl_context *ctx, GLenum target, GLuint buffer)
{
struct gl_buffer_object *oldBufObj;
struct gl_buffer_object *newBufObj = NULL;
struct gl_buffer_object **bindTarget = NULL;
bindTarget = get_buffer_target(ctx, target);
if (!bindTarget) {
_mesa_error(ctx, GL_INVALID_ENUM, "glBindBufferARB(target 0x%x)", target);
return;
}
/* Get pointer to old buffer object (to be unbound) */
oldBufObj = *bindTarget;
if (oldBufObj && oldBufObj->Name == buffer && !oldBufObj->DeletePending)
return; /* rebinding the same buffer object- no change */
/*
* Get pointer to new buffer object (newBufObj)
*/
if (buffer == 0) {
/* The spec says there's not a buffer object named 0, but we use
* one internally because it simplifies things.
*/
newBufObj = ctx->Shared->NullBufferObj;
}
else {
/* non-default buffer object */
newBufObj = _mesa_lookup_bufferobj(ctx, buffer);
if (!newBufObj || newBufObj == &DummyBufferObject) {
/* If this is a new buffer object id, or one which was generated but
* never used before, allocate a buffer object now.
*/
ASSERT(ctx->Driver.NewBufferObject);
newBufObj = ctx->Driver.NewBufferObject(ctx, buffer, target);
if (!newBufObj) {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glBindBufferARB");
return;
}
_mesa_HashInsert(ctx->Shared->BufferObjects, buffer, newBufObj);
}
}
/* bind new buffer */
_mesa_reference_buffer_object(ctx, bindTarget, newBufObj);
/* Pass BindBuffer call to device driver */
if (ctx->Driver.BindBuffer)
ctx->Driver.BindBuffer( ctx, target, newBufObj );
}
/**
* Update the default buffer objects in the given context to reference those
* specified in the shared state and release those referencing the old
* shared state.
*/
void
_mesa_update_default_objects_buffer_objects(struct gl_context *ctx)
{
/* Bind the NullBufferObj to remove references to those
* in the shared context hash table.
*/
bind_buffer_object( ctx, GL_ARRAY_BUFFER_ARB, 0);
bind_buffer_object( ctx, GL_ELEMENT_ARRAY_BUFFER_ARB, 0);
}
/**
* Return the gl_buffer_object for the given ID.
* Always return NULL for ID 0.
*/
struct gl_buffer_object *
_mesa_lookup_bufferobj(struct gl_context *ctx, GLuint buffer)
{
if (buffer == 0)
return NULL;
else
return (struct gl_buffer_object *)
_mesa_HashLookup(ctx->Shared->BufferObjects, buffer);
}
/**
* If *ptr points to obj, set ptr = the Null/default buffer object.
* This is a helper for buffer object deletion.
* The GL spec says that deleting a buffer object causes it to get
* unbound from all arrays in the current context.
*/
static void
unbind(struct gl_context *ctx,
struct gl_buffer_object **ptr,
struct gl_buffer_object *obj)
{
if (*ptr == obj) {
_mesa_reference_buffer_object(ctx, ptr, ctx->Shared->NullBufferObj);
}
}
/**
* Plug default/fallback buffer object functions into the device
* driver hooks.
*/
void
_mesa_init_buffer_object_functions(struct dd_function_table *driver)
{
/* GL_ARB_vertex/pixel_buffer_object */
driver->NewBufferObject = _mesa_new_buffer_object;
driver->DeleteBuffer = _mesa_delete_buffer_object;
driver->BindBuffer = NULL;
driver->BufferData = _mesa_buffer_data;
driver->BufferSubData = _mesa_buffer_subdata;
driver->GetBufferSubData = _mesa_buffer_get_subdata;
driver->UnmapBuffer = _mesa_buffer_unmap;
/* GL_ARB_map_buffer_range */
driver->MapBufferRange = _mesa_buffer_map_range;
driver->FlushMappedBufferRange = _mesa_buffer_flush_mapped_range;
}
/**********************************************************************/
/* API Functions */
/**********************************************************************/
void GLAPIENTRY
_mesa_BindBufferARB(GLenum target, GLuint buffer)
{
GET_CURRENT_CONTEXT(ctx);
ASSERT_OUTSIDE_BEGIN_END(ctx);
if (MESA_VERBOSE & VERBOSE_API)
_mesa_debug(ctx, "glBindBuffer(%s, %u)\n",
_mesa_lookup_enum_by_nr(target), buffer);
bind_buffer_object(ctx, target, buffer);
}
/**
* Delete a set of buffer objects.
*
* \param n Number of buffer objects to delete.
* \param ids Array of \c n buffer object IDs.
*/
void GLAPIENTRY
_mesa_DeleteBuffersARB(GLsizei n, const GLuint *ids)
{
GET_CURRENT_CONTEXT(ctx);
GLsizei i;
ASSERT_OUTSIDE_BEGIN_END(ctx);
FLUSH_VERTICES(ctx, 0);
if (n < 0) {
_mesa_error(ctx, GL_INVALID_VALUE, "glDeleteBuffersARB(n)");
return;
}
_glthread_LOCK_MUTEX(ctx->Shared->Mutex);
for (i = 0; i < n; i++) {
struct gl_buffer_object *bufObj = _mesa_lookup_bufferobj(ctx, ids[i]);
if (bufObj) {
GLuint j;
ASSERT(bufObj->Name == ids[i] || bufObj == &DummyBufferObject);
if (_mesa_bufferobj_mapped(bufObj)) {
/* if mapped, unmap it now */
ctx->Driver.UnmapBuffer(ctx, bufObj);
bufObj->AccessFlags = default_access_mode(ctx);
bufObj->Pointer = NULL;
}
/* unbind any vertex pointers bound to this buffer */
for (j = 0; j < Elements(ctx->Array.VertexAttrib); j++) {
unbind(ctx, &ctx->Array.VertexAttrib[j].BufferObj, bufObj);
}
if (ctx->Array.ElementArrayBufferObj == bufObj) {
_mesa_BindBufferARB( GL_ELEMENT_ARRAY_BUFFER_ARB, 0 );
}
/* The ID is immediately freed for re-use */
_mesa_HashRemove(ctx->Shared->BufferObjects, ids[i]);
/* Make sure we do not run into the classic ABA problem on bind.
* We don't want to allow re-binding a buffer object that's been
* "deleted" by glDeleteBuffers().
*
* The explicit rebinding to the default object in the current context
* prevents the above in the current context, but another context
* sharing the same objects might suffer from this problem.
* The alternative would be to do the hash lookup in any case on bind
* which would introduce more runtime overhead than this.
*/
bufObj->DeletePending = GL_TRUE;
_mesa_reference_buffer_object(ctx, &bufObj, NULL);
}
}
_glthread_UNLOCK_MUTEX(ctx->Shared->Mutex);
}
/**
* Generate a set of unique buffer object IDs and store them in \c buffer.
*
* \param n Number of IDs to generate.
* \param buffer Array of \c n locations to store the IDs.
*/
void GLAPIENTRY
_mesa_GenBuffersARB(GLsizei n, GLuint *buffer)
{
GET_CURRENT_CONTEXT(ctx);
GLuint first;
GLint i;
ASSERT_OUTSIDE_BEGIN_END(ctx);
if (MESA_VERBOSE & VERBOSE_API)
_mesa_debug(ctx, "glGenBuffers(%d)\n", n);
if (n < 0) {
_mesa_error(ctx, GL_INVALID_VALUE, "glGenBuffersARB");
return;
}
if (!buffer) {
return;
}
/*
* This must be atomic (generation and allocation of buffer object IDs)
*/
_glthread_LOCK_MUTEX(ctx->Shared->Mutex);
first = _mesa_HashFindFreeKeyBlock(ctx->Shared->BufferObjects, n);
/* Insert the ID and pointer to dummy buffer object into hash table */
for (i = 0; i < n; i++) {
_mesa_HashInsert(ctx->Shared->BufferObjects, first + i,
&DummyBufferObject);
buffer[i] = first + i;
}
_glthread_UNLOCK_MUTEX(ctx->Shared->Mutex);
}
/**
* Determine if ID is the name of a buffer object.
*
* \param id ID of the potential buffer object.
* \return \c GL_TRUE if \c id is the name of a buffer object,
* \c GL_FALSE otherwise.
*/
GLboolean GLAPIENTRY
_mesa_IsBufferARB(GLuint id)
{
struct gl_buffer_object *bufObj;
GET_CURRENT_CONTEXT(ctx);
ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);
_glthread_LOCK_MUTEX(ctx->Shared->Mutex);
bufObj = _mesa_lookup_bufferobj(ctx, id);
_glthread_UNLOCK_MUTEX(ctx->Shared->Mutex);
return bufObj && bufObj != &DummyBufferObject;
}
void GLAPIENTRY
_mesa_BufferDataARB(GLenum target, GLsizeiptrARB size,
const GLvoid * data, GLenum usage)
{
GET_CURRENT_CONTEXT(ctx);
struct gl_buffer_object *bufObj;
ASSERT_OUTSIDE_BEGIN_END(ctx);
if (MESA_VERBOSE & VERBOSE_API)
_mesa_debug(ctx, "glBufferData(%s, %ld, %p, %s)\n",
_mesa_lookup_enum_by_nr(target),
(long int) size, data,
_mesa_lookup_enum_by_nr(usage));
if (size < 0) {
_mesa_error(ctx, GL_INVALID_VALUE, "glBufferDataARB(size < 0)");
return;
}
switch (usage) {
case GL_STREAM_DRAW_ARB:
case GL_STREAM_READ_ARB:
case GL_STREAM_COPY_ARB:
case GL_STATIC_DRAW_ARB:
case GL_STATIC_READ_ARB:
case GL_STATIC_COPY_ARB:
case GL_DYNAMIC_DRAW_ARB:
case GL_DYNAMIC_READ_ARB:
case GL_DYNAMIC_COPY_ARB:
/* OK */
break;
default:
_mesa_error(ctx, GL_INVALID_ENUM, "glBufferDataARB(usage)");
return;
}
bufObj = get_buffer(ctx, "glBufferDataARB", target);
if (!bufObj)
return;
if (_mesa_bufferobj_mapped(bufObj)) {
/* Unmap the existing buffer. We'll replace it now. Not an error. */
ctx->Driver.UnmapBuffer(ctx, bufObj);
bufObj->AccessFlags = default_access_mode(ctx);
ASSERT(bufObj->Pointer == NULL);
}
FLUSH_VERTICES(ctx, _NEW_BUFFER_OBJECT);
bufObj->Written = GL_TRUE;
#ifdef VBO_DEBUG
printf("glBufferDataARB(%u, sz %ld, from %p, usage 0x%x)\n",
bufObj->Name, size, data, usage);
#endif
#ifdef BOUNDS_CHECK
size += 100;
#endif
ASSERT(ctx->Driver.BufferData);
if (!ctx->Driver.BufferData( ctx, target, size, data, usage, bufObj )) {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glBufferDataARB()");
}
}
void GLAPIENTRY
_mesa_BufferSubDataARB(GLenum target, GLintptrARB offset,
GLsizeiptrARB size, const GLvoid * data)
{
GET_CURRENT_CONTEXT(ctx);
struct gl_buffer_object *bufObj;
ASSERT_OUTSIDE_BEGIN_END(ctx);
bufObj = buffer_object_subdata_range_good( ctx, target, offset, size,
"glBufferSubDataARB" );
if (!bufObj) {
/* error already recorded */
return;
}
if (size == 0)
return;
bufObj->Written = GL_TRUE;
ASSERT(ctx->Driver.BufferSubData);
ctx->Driver.BufferSubData( ctx, offset, size, data, bufObj );
}
void GLAPIENTRY
_mesa_GetBufferSubDataARB(GLenum target, GLintptrARB offset,
GLsizeiptrARB size, void * data)
{
GET_CURRENT_CONTEXT(ctx);
struct gl_buffer_object *bufObj;
ASSERT_OUTSIDE_BEGIN_END(ctx);
bufObj = buffer_object_subdata_range_good( ctx, target, offset, size,
"glGetBufferSubDataARB" );
if (!bufObj) {
/* error already recorded */
return;
}
ASSERT(ctx->Driver.GetBufferSubData);
ctx->Driver.GetBufferSubData( ctx, offset, size, data, bufObj );
}
void * GLAPIENTRY
_mesa_MapBufferARB(GLenum target, GLenum access)
{
GET_CURRENT_CONTEXT(ctx);
struct gl_buffer_object * bufObj;
GLbitfield accessFlags;
void *map;
ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, NULL);
switch (access) {
case GL_READ_ONLY_ARB:
accessFlags = GL_MAP_READ_BIT;
break;
case GL_WRITE_ONLY_ARB:
accessFlags = GL_MAP_WRITE_BIT;
break;
case GL_READ_WRITE_ARB:
accessFlags = GL_MAP_READ_BIT | GL_MAP_WRITE_BIT;
break;
default:
_mesa_error(ctx, GL_INVALID_ENUM, "glMapBufferARB(access)");
return NULL;
}
bufObj = get_buffer(ctx, "glMapBufferARB", target);
if (!bufObj)
return NULL;
if (_mesa_bufferobj_mapped(bufObj)) {
_mesa_error(ctx, GL_INVALID_OPERATION, "glMapBufferARB(already mapped)");
return NULL;
}
if (!bufObj->Size) {
_mesa_error(ctx, GL_OUT_OF_MEMORY,
"glMapBuffer(buffer size = 0)");
return NULL;
}
ASSERT(ctx->Driver.MapBufferRange);
map = ctx->Driver.MapBufferRange(ctx, 0, bufObj->Size, accessFlags, bufObj);
if (!map) {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glMapBufferARB(map failed)");
return NULL;
}
else {
/* The driver callback should have set these fields.
* This is important because other modules (like VBO) might call
* the driver function directly.
*/
ASSERT(bufObj->Pointer == map);
ASSERT(bufObj->Length == bufObj->Size);
ASSERT(bufObj->Offset == 0);
bufObj->AccessFlags = accessFlags;
}
if (access == GL_WRITE_ONLY_ARB || access == GL_READ_WRITE_ARB)
bufObj->Written = GL_TRUE;
#ifdef VBO_DEBUG
printf("glMapBufferARB(%u, sz %ld, access 0x%x)\n",
bufObj->Name, bufObj->Size, access);
if (access == GL_WRITE_ONLY_ARB) {
GLuint i;
GLubyte *b = (GLubyte *) bufObj->Pointer;
for (i = 0; i < bufObj->Size; i++)
b[i] = i & 0xff;
}
#endif
#ifdef BOUNDS_CHECK
{
GLubyte *buf = (GLubyte *) bufObj->Pointer;
GLuint i;
/* buffer is 100 bytes larger than requested, fill with magic value */
for (i = 0; i < 100; i++) {
buf[bufObj->Size - i - 1] = 123;
}
}
#endif
return bufObj->Pointer;
}
GLboolean GLAPIENTRY
_mesa_UnmapBufferARB(GLenum target)
{
GET_CURRENT_CONTEXT(ctx);
struct gl_buffer_object *bufObj;
GLboolean status = GL_TRUE;
ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);
bufObj = get_buffer(ctx, "glUnmapBufferARB", target);
if (!bufObj)
return GL_FALSE;
if (!_mesa_bufferobj_mapped(bufObj)) {
_mesa_error(ctx, GL_INVALID_OPERATION, "glUnmapBufferARB");
return GL_FALSE;
}
#ifdef BOUNDS_CHECK
if (bufObj->Access != GL_READ_ONLY_ARB) {
GLubyte *buf = (GLubyte *) bufObj->Pointer;
GLuint i;
/* check that last 100 bytes are still = magic value */
for (i = 0; i < 100; i++) {
GLuint pos = bufObj->Size - i - 1;
if (buf[pos] != 123) {
_mesa_warning(ctx, "Out of bounds buffer object write detected"
" at position %d (value = %u)\n",
pos, buf[pos]);
}
}
}
#endif
#ifdef VBO_DEBUG
if (bufObj->AccessFlags & GL_MAP_WRITE_BIT) {
GLuint i, unchanged = 0;
GLubyte *b = (GLubyte *) bufObj->Pointer;
GLint pos = -1;
/* check which bytes changed */
for (i = 0; i < bufObj->Size - 1; i++) {
if (b[i] == (i & 0xff) && b[i+1] == ((i+1) & 0xff)) {
unchanged++;
if (pos == -1)
pos = i;
}
}
if (unchanged) {
printf("glUnmapBufferARB(%u): %u of %ld unchanged, starting at %d\n",
bufObj->Name, unchanged, bufObj->Size, pos);
}
}
#endif
status = ctx->Driver.UnmapBuffer( ctx, bufObj );
bufObj->AccessFlags = default_access_mode(ctx);
ASSERT(bufObj->Pointer == NULL);
ASSERT(bufObj->Offset == 0);
ASSERT(bufObj->Length == 0);
return status;
}
void GLAPIENTRY
_mesa_GetBufferParameterivARB(GLenum target, GLenum pname, GLint *params)
{
GET_CURRENT_CONTEXT(ctx);
struct gl_buffer_object *bufObj;
ASSERT_OUTSIDE_BEGIN_END(ctx);
bufObj = get_buffer(ctx, "glGetBufferParameterivARB", target);
if (!bufObj)
return;
switch (pname) {
case GL_BUFFER_SIZE_ARB:
*params = (GLint) bufObj->Size;
return;
case GL_BUFFER_USAGE_ARB:
*params = bufObj->Usage;
return;
case GL_BUFFER_ACCESS_ARB:
*params = simplified_access_mode(bufObj->AccessFlags);
return;
case GL_BUFFER_MAPPED_ARB:
*params = _mesa_bufferobj_mapped(bufObj);
return;
case GL_BUFFER_ACCESS_FLAGS:
if (!ctx->Extensions.ARB_map_buffer_range)
goto invalid_pname;
*params = bufObj->AccessFlags;
return;
case GL_BUFFER_MAP_OFFSET:
if (!ctx->Extensions.ARB_map_buffer_range)
goto invalid_pname;
*params = (GLint) bufObj->Offset;
return;
case GL_BUFFER_MAP_LENGTH:
if (!ctx->Extensions.ARB_map_buffer_range)
goto invalid_pname;
*params = (GLint) bufObj->Length;
return;
default:
; /* fall-through */
}
invalid_pname:
_mesa_error(ctx, GL_INVALID_ENUM, "glGetBufferParameterivARB(pname=%s)",
_mesa_lookup_enum_by_nr(pname));
}
/**
* New in GL 3.2
* This is pretty much a duplicate of GetBufferParameteriv() but the
* GL_BUFFER_SIZE_ARB attribute will be 64-bits on a 64-bit system.
*/
void GLAPIENTRY
_mesa_GetBufferParameteri64v(GLenum target, GLenum pname, GLint64 *params)
{
GET_CURRENT_CONTEXT(ctx);
struct gl_buffer_object *bufObj;
ASSERT_OUTSIDE_BEGIN_END(ctx);
bufObj = get_buffer(ctx, "glGetBufferParameteri64v", target);
if (!bufObj)
return;
switch (pname) {
case GL_BUFFER_SIZE_ARB:
*params = bufObj->Size;
return;
case GL_BUFFER_USAGE_ARB:
*params = bufObj->Usage;
return;
case GL_BUFFER_ACCESS_ARB:
*params = simplified_access_mode(bufObj->AccessFlags);
return;
case GL_BUFFER_ACCESS_FLAGS:
if (!ctx->Extensions.ARB_map_buffer_range)
goto invalid_pname;
*params = bufObj->AccessFlags;
return;
case GL_BUFFER_MAPPED_ARB:
*params = _mesa_bufferobj_mapped(bufObj);
return;
case GL_BUFFER_MAP_OFFSET:
if (!ctx->Extensions.ARB_map_buffer_range)
goto invalid_pname;
*params = bufObj->Offset;
return;
case GL_BUFFER_MAP_LENGTH:
if (!ctx->Extensions.ARB_map_buffer_range)
goto invalid_pname;
*params = bufObj->Length;
return;
default:
; /* fall-through */
}
invalid_pname:
_mesa_error(ctx, GL_INVALID_ENUM, "glGetBufferParameteri64v(pname=%s)",
_mesa_lookup_enum_by_nr(pname));
}
void GLAPIENTRY
_mesa_GetBufferPointervARB(GLenum target, GLenum pname, GLvoid **params)
{
GET_CURRENT_CONTEXT(ctx);
struct gl_buffer_object * bufObj;
ASSERT_OUTSIDE_BEGIN_END(ctx);
if (pname != GL_BUFFER_MAP_POINTER_ARB) {
_mesa_error(ctx, GL_INVALID_ENUM, "glGetBufferPointervARB(pname)");
return;
}
bufObj = get_buffer(ctx, "glGetBufferPointervARB", target);
if (!bufObj)
return;
*params = bufObj->Pointer;
}
/**
* See GL_ARB_map_buffer_range spec
*/
void * GLAPIENTRY
_mesa_MapBufferRange(GLenum target, GLintptr offset, GLsizeiptr length,
GLbitfield access)
{
GET_CURRENT_CONTEXT(ctx);
struct gl_buffer_object *bufObj;
void *map;
ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, NULL);
if (!ctx->Extensions.ARB_map_buffer_range) {
_mesa_error(ctx, GL_INVALID_OPERATION,
"glMapBufferRange(extension not supported)");
return NULL;
}
if (offset < 0) {
_mesa_error(ctx, GL_INVALID_VALUE,
"glMapBufferRange(offset = %ld)", (long)offset);
return NULL;
}
if (length < 0) {
_mesa_error(ctx, GL_INVALID_VALUE,
"glMapBufferRange(length = %ld)", (long)length);
return NULL;
}
if (access & ~(GL_MAP_READ_BIT |
GL_MAP_WRITE_BIT |
GL_MAP_INVALIDATE_RANGE_BIT |
GL_MAP_INVALIDATE_BUFFER_BIT |
GL_MAP_FLUSH_EXPLICIT_BIT |
GL_MAP_UNSYNCHRONIZED_BIT)) {
/* generate an error if any undefind bit is set */
_mesa_error(ctx, GL_INVALID_VALUE, "glMapBufferRange(access)");
return NULL;
}
if ((access & (GL_MAP_READ_BIT | GL_MAP_WRITE_BIT)) == 0) {
_mesa_error(ctx, GL_INVALID_OPERATION,
"glMapBufferRange(access indicates neither read or write)");
return NULL;
}
if ((access & GL_MAP_READ_BIT) &&
(access & (GL_MAP_INVALIDATE_RANGE_BIT |
GL_MAP_INVALIDATE_BUFFER_BIT |
GL_MAP_UNSYNCHRONIZED_BIT))) {
_mesa_error(ctx, GL_INVALID_OPERATION,
"glMapBufferRange(invalid access flags)");
return NULL;
}
if ((access & GL_MAP_FLUSH_EXPLICIT_BIT) &&
((access & GL_MAP_WRITE_BIT) == 0)) {
_mesa_error(ctx, GL_INVALID_OPERATION,
"glMapBufferRange(invalid access flags)");
return NULL;
}
bufObj = get_buffer(ctx, "glMapBufferRange", target);
if (!bufObj)
return NULL;
if (offset + length > bufObj->Size) {
_mesa_error(ctx, GL_INVALID_VALUE,
"glMapBufferRange(offset + length > size)");
return NULL;
}
if (_mesa_bufferobj_mapped(bufObj)) {
_mesa_error(ctx, GL_INVALID_OPERATION,
"glMapBufferRange(buffer already mapped)");
return NULL;
}
if (!bufObj->Size) {
_mesa_error(ctx, GL_OUT_OF_MEMORY,
"glMapBufferRange(buffer size = 0)");
return NULL;
}
/* Mapping zero bytes should return a non-null pointer. */
if (!length) {
static long dummy = 0;
bufObj->Pointer = &dummy;
bufObj->Length = length;
bufObj->Offset = offset;
bufObj->AccessFlags = access;
return bufObj->Pointer;
}
ASSERT(ctx->Driver.MapBufferRange);
map = ctx->Driver.MapBufferRange(ctx, offset, length, access, bufObj);
if (!map) {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glMapBufferARB(map failed)");
}
else {
/* The driver callback should have set all these fields.
* This is important because other modules (like VBO) might call
* the driver function directly.
*/
ASSERT(bufObj->Pointer == map);
ASSERT(bufObj->Length == length);
ASSERT(bufObj->Offset == offset);
ASSERT(bufObj->AccessFlags == access);
}
return map;
}
/**
* See GL_ARB_map_buffer_range spec
*/
void GLAPIENTRY
_mesa_FlushMappedBufferRange(GLenum target, GLintptr offset, GLsizeiptr length)
{
GET_CURRENT_CONTEXT(ctx);
struct gl_buffer_object *bufObj;
ASSERT_OUTSIDE_BEGIN_END(ctx);
if (!ctx->Extensions.ARB_map_buffer_range) {
_mesa_error(ctx, GL_INVALID_OPERATION,
"glFlushMappedBufferRange(extension not supported)");
return;
}
if (offset < 0) {
_mesa_error(ctx, GL_INVALID_VALUE,
"glFlushMappedBufferRange(offset = %ld)", (long)offset);
return;
}
if (length < 0) {
_mesa_error(ctx, GL_INVALID_VALUE,
"glFlushMappedBufferRange(length = %ld)", (long)length);
return;
}
bufObj = get_buffer(ctx, "glFlushMappedBufferRange", target);
if (!bufObj)
return;
if (!_mesa_bufferobj_mapped(bufObj)) {
/* buffer is not mapped */
_mesa_error(ctx, GL_INVALID_OPERATION,
"glFlushMappedBufferRange(buffer is not mapped)");
return;
}
if ((bufObj->AccessFlags & GL_MAP_FLUSH_EXPLICIT_BIT) == 0) {
_mesa_error(ctx, GL_INVALID_OPERATION,
"glFlushMappedBufferRange(GL_MAP_FLUSH_EXPLICIT_BIT not set)");
return;
}
if (offset + length > bufObj->Length) {
_mesa_error(ctx, GL_INVALID_VALUE,
"glFlushMappedBufferRange(offset %ld + length %ld > mapped length %ld)",
(long)offset, (long)length, (long)bufObj->Length);
return;
}
ASSERT(bufObj->AccessFlags & GL_MAP_WRITE_BIT);
if (ctx->Driver.FlushMappedBufferRange)
ctx->Driver.FlushMappedBufferRange(ctx, offset, length, bufObj);
}
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