/**
* 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);
}
/**
* Specify a buffer object to receive vertex shader results, plus the
* offset in the buffer to start placing results.
* This function is part of GL_EXT_transform_feedback, but not GL3.
*/
void GLAPIENTRY
_mesa_BindBufferOffsetEXT(GLenum target, GLuint index, GLuint buffer,
GLintptr offset)
{
struct gl_transform_feedback_object *obj;
struct gl_buffer_object *bufObj;
GET_CURRENT_CONTEXT(ctx);
GLsizeiptr size;
if (target != GL_TRANSFORM_FEEDBACK_BUFFER) {
_mesa_error(ctx, GL_INVALID_ENUM, "glBindBufferOffsetEXT(target)");
return;
}
obj = ctx->TransformFeedback.CurrentObject;
if (obj->Active) {
_mesa_error(ctx, GL_INVALID_OPERATION,
"glBindBufferOffsetEXT(transform feedback active)");
return;
}
if (index >= ctx->Const.MaxTransformFeedbackBuffers) {
_mesa_error(ctx, GL_INVALID_VALUE,
"glBindBufferOffsetEXT(index=%d)", index);
return;
}
if (offset & 0x3) {
/* must be multiple of four */
_mesa_error(ctx, GL_INVALID_VALUE,
"glBindBufferOffsetEXT(offset=%d)", (int) offset);
return;
}
if (buffer == 0) {
bufObj = ctx->Shared->NullBufferObj;
} else {
bufObj = _mesa_lookup_bufferobj(ctx, buffer);
}
if (!bufObj) {
_mesa_error(ctx, GL_INVALID_OPERATION,
"glBindBufferOffsetEXT(invalid buffer=%u)", buffer);
return;
}
/* default size is the buffer size rounded down to nearest
* multiple of four.
*/
size = (bufObj->Size - offset) & ~0x3;
bind_buffer_range(ctx, index, bufObj, offset, size);
}
/**
* 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 ? GL_TRUE : GL_FALSE;
}
/**
* 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 );
}
/**
* Wrapper around _mesa_lookup_bufferobj that throws GL_INVALID_VALUE if id
* is not in the hash table. Specialised version for the
* transform-feedback-related functions. After calling _mesa_error, it
* returns NULL.
*/
static struct gl_buffer_object *
lookup_transform_feedback_bufferobj_err(struct gl_context *ctx,
GLuint buffer, const char* func)
{
struct gl_buffer_object *bufObj;
/* OpenGL 4.5 core profile, 13.2, pdf page 444: buffer must be zero or the
* name of an existing buffer object.
*/
if (buffer == 0) {
bufObj = ctx->Shared->NullBufferObj;
} else {
bufObj = _mesa_lookup_bufferobj(ctx, buffer);
if (!bufObj) {
_mesa_error(ctx, GL_INVALID_VALUE, "%s(invalid buffer=%u)", func,
buffer);
}
}
return bufObj;
}
/**
* 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);
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) {
struct gl_array_object *arrayObj = ctx->Array.ArrayObj;
GLuint j;
ASSERT(bufObj->Name == ids[i]);
if (bufObj->Pointer) {
/* if mapped, unmap it now */
ctx->Driver.UnmapBuffer(ctx, 0, bufObj);
bufObj->AccessFlags = DEFAULT_ACCESS;
bufObj->Pointer = NULL;
}
/* unbind any vertex pointers bound to this buffer */
unbind(ctx, &arrayObj->Vertex.BufferObj, bufObj);
unbind(ctx, &arrayObj->Weight.BufferObj, bufObj);
unbind(ctx, &arrayObj->Normal.BufferObj, bufObj);
unbind(ctx, &arrayObj->Color.BufferObj, bufObj);
unbind(ctx, &arrayObj->SecondaryColor.BufferObj, bufObj);
unbind(ctx, &arrayObj->FogCoord.BufferObj, bufObj);
unbind(ctx, &arrayObj->Index.BufferObj, bufObj);
unbind(ctx, &arrayObj->EdgeFlag.BufferObj, bufObj);
for (j = 0; j < Elements(arrayObj->TexCoord); j++) {
unbind(ctx, &arrayObj->TexCoord[j].BufferObj, bufObj);
}
for (j = 0; j < Elements(arrayObj->VertexAttrib); j++) {
unbind(ctx, &arrayObj->VertexAttrib[j].BufferObj, bufObj);
}
if (ctx->Array.ArrayBufferObj == bufObj) {
_mesa_BindBufferARB( GL_ARRAY_BUFFER_ARB, 0 );
}
if (ctx->Array.ElementArrayBufferObj == bufObj) {
_mesa_BindBufferARB( GL_ELEMENT_ARRAY_BUFFER_ARB, 0 );
}
/* unbind any pixel pack/unpack pointers bound to this buffer */
if (ctx->Pack.BufferObj == bufObj) {
_mesa_BindBufferARB( GL_PIXEL_PACK_BUFFER_EXT, 0 );
}
if (ctx->Unpack.BufferObj == bufObj) {
_mesa_BindBufferARB( GL_PIXEL_UNPACK_BUFFER_EXT, 0 );
}
/* The ID is immediately freed for re-use */
_mesa_HashRemove(ctx->Shared->BufferObjects, bufObj->Name);
_mesa_reference_buffer_object(ctx, &bufObj, NULL);
}
}
_glthread_UNLOCK_MUTEX(ctx->Shared->Mutex);
}
/**
* Bind the specified target to buffer for the specified context.
*/
static void
bind_buffer_object(GLcontext *ctx, GLenum target, GLuint buffer)
{
struct gl_buffer_object *oldBufObj;
struct gl_buffer_object *newBufObj = NULL;
struct gl_buffer_object **bindTarget = NULL;
switch (target) {
case GL_ARRAY_BUFFER_ARB:
bindTarget = &ctx->Array.ArrayBufferObj;
break;
case GL_ELEMENT_ARRAY_BUFFER_ARB:
bindTarget = &ctx->Array.ElementArrayBufferObj;
break;
case GL_PIXEL_PACK_BUFFER_EXT:
bindTarget = &ctx->Pack.BufferObj;
break;
case GL_PIXEL_UNPACK_BUFFER_EXT:
bindTarget = &ctx->Unpack.BufferObj;
break;
case GL_COPY_READ_BUFFER:
if (ctx->Extensions.ARB_copy_buffer) {
bindTarget = &ctx->CopyReadBuffer;
}
break;
case GL_COPY_WRITE_BUFFER:
if (ctx->Extensions.ARB_copy_buffer) {
bindTarget = &ctx->CopyWriteBuffer;
}
break;
default:
; /* no-op / we'll hit the follow error test next */
}
if (!bindTarget) {
_mesa_error(ctx, GL_INVALID_ENUM, "glBindBufferARB(target 0x%x)");
return;
}
/* Get pointer to old buffer object (to be unbound) */
oldBufObj = get_buffer(ctx, target);
if (oldBufObj && oldBufObj->Name == buffer)
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) {
/* if this is a new buffer object id, 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 );
}