Commit 28d73358 authored by Fredrik Höglund's avatar Fredrik Höglund

mesa: Add helper functions for looking up multiple buffers

v2: Document the difference between _mesa_lookup_bufferobj() and
    _mesa_multi_bind_lookup_bufferobj().
v3: Don't create the buffer objects when they don't exist.

Reviewed-by: Brian Paul <brianp@vmware.com> (v2)
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com> (v2)
parent 19f7eeb6
......@@ -975,6 +975,78 @@ _mesa_lookup_bufferobj(struct gl_context *ctx, GLuint buffer)
}
struct gl_buffer_object *
_mesa_lookup_bufferobj_locked(struct gl_context *ctx, GLuint buffer)
{
return (struct gl_buffer_object *)
_mesa_HashLookupLocked(ctx->Shared->BufferObjects, buffer);
}
void
_mesa_begin_bufferobj_lookups(struct gl_context *ctx)
{
_mesa_HashLockMutex(ctx->Shared->BufferObjects);
}
void
_mesa_end_bufferobj_lookups(struct gl_context *ctx)
{
_mesa_HashUnlockMutex(ctx->Shared->BufferObjects);
}
/**
* Look up a buffer object for a multi-bind function.
*
* Unlike _mesa_lookup_bufferobj(), this function also takes care
* of generating an error if the buffer ID is not zero or the name
* of an existing buffer object.
*
* If the buffer ID refers to an existing buffer object, a pointer
* to the buffer object is returned. If the ID is zero, a pointer
* to the shared NullBufferObj is returned. If the ID is not zero
* and does not refer to a valid buffer object, this function
* returns NULL.
*
* This function assumes that the caller has already locked the
* hash table mutex by calling _mesa_begin_bufferobj_lookups().
*/
struct gl_buffer_object *
_mesa_multi_bind_lookup_bufferobj(struct gl_context *ctx,
const GLuint *buffers,
GLuint index, const char *caller)
{
struct gl_buffer_object *bufObj;
if (buffers[index] != 0) {
bufObj = _mesa_lookup_bufferobj_locked(ctx, buffers[index]);
/* The multi-bind functions don't create the buffer objects
when they don't exist. */
if (bufObj == &DummyBufferObject)
bufObj = NULL;
} else
bufObj = ctx->Shared->NullBufferObj;
if (!bufObj) {
/* The ARB_multi_bind spec says:
*
* "An INVALID_OPERATION error is generated if any value
* in <buffers> is not zero or the name of an existing
* buffer object (per binding)."
*/
_mesa_error(ctx, GL_INVALID_OPERATION,
"%s(buffers[%u]=%u is not zero or the name "
"of an existing buffer object)",
caller, index, buffers[index]);
}
return bufObj;
}
/**
* If *ptr points to obj, set ptr = the Null/default buffer object.
* This is a helper for buffer object deletion.
......
......@@ -86,6 +86,20 @@ _mesa_update_default_objects_buffer_objects(struct gl_context *ctx);
extern struct gl_buffer_object *
_mesa_lookup_bufferobj(struct gl_context *ctx, GLuint buffer);
extern struct gl_buffer_object *
_mesa_lookup_bufferobj_locked(struct gl_context *ctx, GLuint buffer);
extern void
_mesa_begin_bufferobj_lookups(struct gl_context *ctx);
extern void
_mesa_end_bufferobj_lookups(struct gl_context *ctx);
extern struct gl_buffer_object *
_mesa_multi_bind_lookup_bufferobj(struct gl_context *ctx,
const GLuint *buffers,
GLuint index, const char *caller);
extern void
_mesa_initialize_buffer_object(struct gl_context *ctx,
struct gl_buffer_object *obj,
......
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