308 lines
11 KiB
C
308 lines
11 KiB
C
/*
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* Copyright (c) 2016, NVIDIA CORPORATION.
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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/or associated documentation files (the
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* "Materials"), to deal in the Materials without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Materials, and to
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* permit persons to whom the Materials are furnished to do so, subject to
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* 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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* unaltered in all copies or substantial portions of the Materials.
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* Any additions, deletions, or changes to the original source files
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* must be clearly indicated in accompanying documentation.
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*
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* If only executable code is distributed, then the accompanying
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* documentation must state that "this software is based in part on the
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* work of the Khronos Group."
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*
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* THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS.
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*/
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/**
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* \file
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*
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* Defines the interface between the libglvnd server module and a vendor
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* library.
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*
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* Each screen may have one vendor library assigned to it. The GLVND module
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* will examine each GLX request to determine which screen it goes to, and then
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* it will forward that request to whichever vendor is assigned to that screen.
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*
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* Each vendor library is represented by an opaque __GLXServerVendor handle.
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* Display drivers are responsible for creating handles for its GLX
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* implementations, and assigning those handles to each screen.
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*
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* The GLVND module keeps a list of callbacks, which are called from
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* InitExtensions. Drivers should use that callback to assign a vendor
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* handle to whichever screens they support.
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*
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* Additional notes about dispatching:
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* - If a request has one or more GLXContextTag values, then the dispatch stub
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* must ensure that all of the tags belong to the vendor that it forwards the
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* request to. Otherwise, if a vendor library tries to look up the private
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* data for the tag, it could get the data from another vendor and crash.
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* - Following from the last point, if a request takes a GLXContextTag value,
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* then the dispatch stub should use the tag to select a vendor. If the
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* request takes two or more tags, then the vendor must ensure that they all
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* map to the same vendor.
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*/
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#ifndef GLXVENDORABI_H
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#define GLXVENDORABI_H
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#include <scrnintstr.h>
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#include <extnsionst.h>
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#include <GL/glxproto.h>
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/*!
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* Current version of the ABI.
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*
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* This version number contains a major number in the high-order 16 bits, and
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* a minor version number in the low-order 16 bits.
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*
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* The major version number is incremented when an interface change will break
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* backwards compatibility with existing vendor libraries. The minor version
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* number is incremented when there's a change but existing vendor libraries
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* will still work.
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*/
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#define GLXSERVER_VENDOR_ABI_MAJOR_VERSION 0
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#define GLXSERVER_VENDOR_ABI_MINOR_VERSION 0
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#if defined(__cplusplus)
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extern "C" {
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#endif
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/**
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* An opaque pointer representing a vendor library.
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*/
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typedef struct GlxServerVendorRec GlxServerVendor;
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typedef int (* GlxServerDispatchProc) (ClientPtr client);
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typedef struct GlxServerImportsRec GlxServerImports;
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/**
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* Functions exported by libglvnd to the vendor library.
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*/
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typedef struct GlxServerExportsRec {
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int majorVersion;
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int minorVersion;
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/**
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* This callback is called during each server generation when the GLX
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* extension is initialized.
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*
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* Drivers may create a __GLXServerVendor handle at any time, but may only
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* assign a vendor to a screen from this callback.
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*
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* The callback is called with the ExtensionEntry pointer for the GLX
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* extension.
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*/
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CallbackListPtr *extensionInitCallback;
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/**
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* Allocates and zeroes a __GLXserverImports structure.
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*
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* Future versions of the GLVND interface may add optional members to the
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* end of the __GLXserverImports struct. Letting the GLVND layer allocate
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* the __GLXserverImports struct allows backward compatibility with
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* existing drivers.
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*/
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GlxServerImports * (* allocateServerImports) (void);
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/**
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* Frees a __GLXserverImports structure that was allocated with
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* \c allocateServerImports.
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*/
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void (* freeServerImports) (GlxServerImports *imports);
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/**
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* Creates a new vendor library handle.
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*/
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GlxServerVendor * (* createVendor) (const GlxServerImports *imports);
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/**
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* Destroys a vendor library handle.
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*
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* This function may not be called while the vendor handle is assigned to a
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* screen, but it may be called from the __GLXserverImports::extensionCloseDown
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* callback.
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*/
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void (* destroyVendor) (GlxServerVendor *vendor);
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/**
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* Sets the vendor library to use for a screen.
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*
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* This function should be called from the screen's CreateScreenResources
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* callback.
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*/
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Bool (* setScreenVendor) (ScreenPtr screen, GlxServerVendor *vendor);
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/**
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* Adds an entry to the XID map.
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*
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* This mapping is used to dispatch requests based on an XID.
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*
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* Client-generated XID's (contexts, drawables, etc) must be added to the
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* map by the dispatch stub.
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*
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* XID's that are generated in the server should be added by the vendor
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* library.
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*
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* Vendor libraries are responsible for keeping track of any additional
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* data they need for the XID's.
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*
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* Note that adding GLXFBConfig ID's appears to be unnecessary -- every GLX
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* request I can find that takes a GLXFBConfig also takes a screen number.
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*
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* \param id The XID to add to the map. The XID must not already be in the
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* map.
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* \param vendor The vendor library to associate with \p id.
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* \return True on success, or False on failure.
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*/
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Bool (* addXIDMap) (XID id, GlxServerVendor *vendor);
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/**
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* Returns the vendor and data for an XID, as added with \c addXIDMap.
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*
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* If \p id wasn't added with \c addXIDMap (for example, if it's a regular
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* X window), then libglvnd will try to look it up as a drawable and return
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* the vendor for whatever screen it's on.
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*
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* \param id The XID to look up.
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* \return The vendor that owns the XID, or \c NULL if no matching vendor
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* was found.
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*/
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GlxServerVendor * (* getXIDMap) (XID id);
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/**
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* Removes an entry from the XID map.
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*/
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void (* removeXIDMap) (XID id);
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/**
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* Looks up a context tag.
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*
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* Context tags are created and managed by libglvnd to ensure that they're
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* unique between vendors.
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*
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* \param client The client connection.
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* \param tag The context tag.
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* \return The vendor that owns the context tag, or \c NULL if the context
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* tag is invalid.
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*/
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GlxServerVendor * (* getContextTag)(ClientPtr client, GLXContextTag tag);
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/**
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* Assigns a pointer to vendor-private data for a context tag.
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*
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* Since the tag values are assigned by GLVND, vendors can use this
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* function to store any private data they need for a context tag.
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*
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* \param client The client connection.
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* \param tag The context tag.
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* \param data An arbitrary pointer value.
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*/
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Bool (* setContextTagPrivate)(ClientPtr client, GLXContextTag tag, void *data);
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/**
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* Returns the private data pointer that was assigned from
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* setContextTagPrivate.
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*
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* This function is safe to use in __GLXserverImports::makeCurrent to look
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* up the old context private pointer.
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*
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* However, this function is not safe to use from a ClientStateCallback,
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* because GLVND may have alraedy deleted the tag by that point.
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*/
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void * (* getContextTagPrivate)(ClientPtr client, GLXContextTag tag);
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GlxServerVendor * (* getVendorForScreen) (ClientPtr client, ScreenPtr screen);
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/**
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* Forwards a request to a vendor library.
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*
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* \param vendor The vendor to send the request to.
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* \param client The client.
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*/
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int (* forwardRequest) (GlxServerVendor *vendor, ClientPtr client);
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} GlxServerExports;
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extern _X_EXPORT const GlxServerExports glxServer;
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/**
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* Functions exported by the vendor library to libglvnd.
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*/
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struct GlxServerImportsRec {
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/**
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* Called on a server reset.
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*
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* This is called from the extension's CloseDown callback.
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*
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* Note that this is called after freeing all of GLVND's per-screen data,
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* so the callback may destroy any vendor handles.
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*
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* If the server is exiting, then GLVND will free any remaining vendor
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* handles after calling the extensionCloseDown callbacks.
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*/
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void (* extensionCloseDown) (const ExtensionEntry *extEntry);
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/**
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* Handles a GLX request.
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*/
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int (* handleRequest) (ClientPtr client);
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/**
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* Returns a dispatch function for a request.
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*
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* \param minorOpcode The minor opcode of the request.
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* \param vendorCode The vendor opcode, if \p minorOpcode
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* is \c X_GLXVendorPrivate or \c X_GLXVendorPrivateWithReply.
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* \return A dispatch function, or NULL if the vendor doesn't support this
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* request.
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*/
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GlxServerDispatchProc (* getDispatchAddress) (CARD8 minorOpcode, CARD32 vendorCode);
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/**
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* Handles a MakeCurrent request.
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*
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* This function is called to handle any MakeCurrent request. The vendor
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* library should deal with changing the current context. After the vendor
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* returns GLVND will send the reply.
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*
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* In addition, GLVND will call this function with any current contexts
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* when a client disconnects.
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*
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* To ensure that context tags are unique, libglvnd will select a context
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* tag and pass it to the vendor library.
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*
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* The vendor can use \c __GLXserverExports::getContextTagPrivate to look
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* up the private data pointer for \p oldContextTag.
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*
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* Likewise, the vendor can use \c __GLXserverExports::setContextTagPrivate
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* to assign a private data pointer to \p newContextTag.
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*/
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int (* makeCurrent) (ClientPtr client,
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GLXContextTag oldContextTag,
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XID drawable,
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XID readdrawable,
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XID context,
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GLXContextTag newContextTag);
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};
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#if defined(__cplusplus)
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}
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#endif
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#endif // GLXVENDORABI_H
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