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https://gitlab.freedesktop.org/mesa/mesa.git
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db7e49d5ff
Acked-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/33794>
112 lines
3.5 KiB
C
112 lines
3.5 KiB
C
/*
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* Mesa 3-D graphics library
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*
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* Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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/*
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* This file manages the OpenGL API dispatch layer.
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* The dispatch table (struct _glapi_table) is basically just a list
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* of function pointers.
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* There are functions to set/get the current dispatch table for the
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* current thread.
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*/
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#include "c11/threads.h"
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#include "util/u_thread.h"
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#include "glapi/glapi.h"
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#include "table.h"
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#include "stub.h"
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/**
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* \name Current dispatch and current context control variables
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*
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* Depending on whether or not multithreading is support, and the type of
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* support available, several variables are used to store the current context
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* pointer and the current dispatch table pointer. In the non-threaded case,
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* the variables \c _mesa_glapi_Dispatch and \c _glapi_Context are used for this
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* purpose.
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*
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* In multi threaded case, The TLS variables \c _mesa_glapi_tls_Dispatch and
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* \c _mesa_glapi_tls_Context are used. Having \c _mesa_glapi_Dispatch
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* be hardcoded to \c NULL maintains binary compatability between TLS enabled
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* loaders and non-TLS DRI drivers. When \c _mesa_glapi_Dispatch
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* are \c NULL, the thread state data \c ContextTSD are used.
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*/
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/*@{*/
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__THREAD_INITIAL_EXEC struct _glapi_table *_mesa_glapi_tls_Dispatch
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= (struct _glapi_table *) table_noop_array;
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__THREAD_INITIAL_EXEC void *_mesa_glapi_tls_Context;
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const struct _glapi_table *_mesa_glapi_Dispatch;
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/*@}*/
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/**
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* Set the current context pointer for this thread.
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* The context pointer is an opaque type which should be cast to
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* void from the real context pointer type.
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*/
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void
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_mesa_glapi_set_context(void *ptr)
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{
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_mesa_glapi_tls_Context = ptr;
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}
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/**
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* Get the current context pointer for this thread.
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* The context pointer is an opaque type which should be cast from
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* void to the real context pointer type.
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*/
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void *
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_mesa_glapi_get_context(void)
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{
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return _mesa_glapi_tls_Context;
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}
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/**
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* Set the global or per-thread dispatch table pointer.
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* If the dispatch parameter is NULL we'll plug in the no-op dispatch
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* table (__glapi_noop_table).
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*/
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void
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_mesa_glapi_set_dispatch(struct _glapi_table *tbl)
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{
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stub_init_once();
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if (!tbl)
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tbl = (struct _glapi_table *) table_noop_array;
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_mesa_glapi_tls_Dispatch = tbl;
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}
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/**
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* Return pointer to current dispatch table for calling thread.
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*/
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struct _glapi_table *
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_mesa_glapi_get_dispatch(void)
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{
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return _mesa_glapi_tls_Dispatch;
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}
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