/*
* Copyright (c) 2013, NVIDIA CORPORATION.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and/or associated documentation files (the
* "Materials"), to deal in the Materials without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Materials, and to
* permit persons to whom the Materials are furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included
* unaltered in all copies or substantial portions of the Materials.
* Any additions, deletions, or changes to the original source files
* must be clearly indicated in accompanying documentation.
*
* If only executable code is distributed, then the accompanying
* documentation must state that "this software is based in part on the
* work of the Khronos Group."
*
* THE MATERIALS ARE 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 THE AUTHORS OR COPYRIGHT HOLDERS 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
* MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS.
*/
#if !defined(__LIB_GLX_ABI_H)
#define __LIB_GLX_ABI_H
#include <stdint.h>
#include <GL/glx.h>
#include "glvnd/GLdispatchABI.h"
#if defined(__cplusplus)
extern "C" {
#endif
/*!
* \defgroup glxvendorabi GLX Vendor ABI
*
* Definition of ABI exported by libGLX.so to libGLX_VENDOR.so libraries.
*
* Each vendor is associated with three distinct dispatch table types:
*
* - static GLX dispatch table: this is the fixed list of GLX 1.4 entrypoints
* provided by the vendor at load time during the initial handshake.
* - dynamic GLX dispatch table: this is a structure allocated by the API
* library at runtime used to manage GLX extension functions which are not
* present in the static table.
* - core GL dispatch table: this is a structure maintained by the API library
* which contains both GL core (static) and GL extension (dynamic) functions.
*
* Note that while the implementations of most GLX functions in a vendor
* library is mostly unchanged from a traditional, single-vendor driver, libGLX
* has additional requirements for GLXContext and GLXFBConfig handle values.
*
* First, all GLXContext and GLXFBConfig handles have to be unique between
* vendor libraries. That is, every GLXContext or GLXFBConfig handle must map
* to exactly one vendor library, so that libGLX knows which library to dispatch
* to.
*
* To do that, all GLXContext and GLXFBConfig handles *must* be a pointer to an
* address that the vendor library somehow controls. The address doesn't need
* to be readable or writable, but it must be an address that no other vendor
* library would use.
*
* The address could be a pointer to a structure, or an address in a statically
* or dynamically allocated array. It could even be a file mapping, or even an
* offset into wherever the vendor library itself is mapped.
*
* A vendor library may not, however, use anything like an index or an XID for
* a GLXContext or GLXFBConfig handle.
*
* GLXContext handles must also be globally unique across all display
* connections in the entire process. That is, a vendor library may not return
* the same GLXContext handle for two different contexts, even if they're on
* different displays or different servers.
*
* GLXFBConfigs may be duplicated between multiple displays, as long as they
* are still unique between vendors. Some applications even depend on this:
* They will look up a GLXFBConfig handle with one connection, and then try to
* use that config on another connection.
*
* @{
*/
/*!
* Current version of the ABI.
*
* This version number contains a major number in the high-order 16 bits, and
* a minor version number in the low-order 16 bits.
*
* The major version number is incremented when an interface change will break
* backwards compatibility with existing vendor libraries. The minor version
* number is incremented when there's a change but existing vendor libraries
* will still work.
*/
#define GLX_VENDOR_ABI_MAJOR_VERSION ((uint32_t) 1)
#define GLX_VENDOR_ABI_MINOR_VERSION ((uint32_t) 0)
#define GLX_VENDOR_ABI_VERSION ((GLX_VENDOR_ABI_MAJOR_VERSION << 16) | GLX_VENDOR_ABI_MINOR_VERSION)
static inline uint32_t GLX_VENDOR_ABI_GET_MAJOR_VERSION(uint32_t version)
{
return version >> 16;
}
static inline uint32_t GLX_VENDOR_ABI_GET_MINOR_VERSION(uint32_t version)
{
return version & 0xFFFF;
}
/*!
* This opaque structure stores function pointers for GLX extension functions.
* It is allocated at runtime by the API library. Vendor-provided dispatch
* functions retrieve and operate on this structure using the API below.
*/
typedef struct __GLXvendorInfoRec __GLXvendorInfo;
/****************************************************************************
* API library exports *
****************************************************************************/
/*!
* Functions exported by libGLX.so.
*
* These functions are exported by libGLX, and should be used by the
* vendor-implemented dispatch functions to lookup and call into the right
* vendor.
*
* These functions should only be called from the GLX dispatch functions, never
* from the actual implementation of any function. libGLX.so may be holding a
* non-recursive lock when it calls into the vendor library, so trying to call
* back into libGLX could deadlock.
*/
typedef struct __GLXapiExportsRec {
/*!
* This fetches the appropriate dynamic GLX dispatch table given the display
* and screen number.
*/
__GLXvendorInfo *(*getDynDispatch)(Display *dpy,
const int screen);
/*!
* This function retrieves the appropriate current dynamic dispatch table,
* if a GL context is current. Otherwise, this returns NULL.
*/
__GLXvendorInfo *(*getCurrentDynDispatch)(void);
/*!
* This function retrieves an entry point from the dynamic dispatch table
* given an index into the table.
*/
__GLXextFuncPtr (*fetchDispatchEntry)
(__GLXvendorInfo *dynDispatch, int index);
/************************************************************************
* This routine is used by the vendor to lookup its context structure.
* The contents of this structure are opaque to the API library and
* vendor-dependent.
************************************************************************/
/*!
* This retrieves the current context for this thread.
*/
GLXContext (*getCurrentContext)(void);
/************************************************************************
* These routines are used by vendor dispatch functions to look up
* and add mappings between various objects and vendors.
************************************************************************/
/*!
* Records the vendor for a context. The vendor must be the one returned
* for the XVisualInfo or GLXFBConfig that the context is created from.
*
* \param dpy The display pointer.
* \param context The context handle.
* \param vendor The vendor that created the context.
* \return Zero on success, non-zero on error.
*/
int (*addVendorContextMapping)(Display *dpy, GLXContext context, __GLXvendorInfo *vendor);
/*!
* Removes a mapping from context to vendor. The context must have been
* added with \p addVendorContextMapping.
*/
void (*removeVendorContextMapping)(Display *dpy, GLXContext context);
/*!
* Looks up the vendor for a context.
*
* If no mapping is found, then this function will return \c NULL. No
* errors are raised, so the dispatch function must raise any appropriate X
* errors.
*
* Note that this function does not take a display connection, since
* there are cases (e.g., glXGetContextIDEXT) that take a GLXContext but
* not a display.
*
* \param context The context to look up.
* \return The vendor for the context, or NULL if no matching context was
* found.
*/
__GLXvendorInfo * (*vendorFromContext)(GLXContext context);
int (*addVendorFBConfigMapping)(Display *dpy, GLXFBConfig config, __GLXvendorInfo *vendor);
void (*removeVendorFBConfigMapping)(Display *dpy, GLXFBConfig config);
__GLXvendorInfo * (*vendorFromFBConfig)(Display *dpy, GLXFBConfig config);
int (*addVendorDrawableMapping)(Display *dpy, GLXDrawable drawable, __GLXvendorInfo *vendor);
void (*removeVendorDrawableMapping)(Display *dpy, GLXDrawable drawable);
/*!
* Looks up the vendor for a drawable.
*
* If the drawable was created from another GLX function, then this will
* return the same vendor library that was used to create it.
*
* If the drawable was not created from GLX (a regular X window, for
* example), then libGLX.so will use the x11glvnd server extension to
* figure out a vendor library.
*
* All of this should be opaque to a dispatch function, since the only
* thing that matters is finding out which vendor to dispatch to.
*/
__GLXvendorInfo * (*vendorFromDrawable)(Display *dpy, GLXDrawable drawable);
} __GLXapiExports;
/*****************************************************************************
* API library imports *
*****************************************************************************/
/*!
* This structure stores required and optional vendor library callbacks.
*/
typedef struct __GLXapiImportsRec {
/*!
* Checks if the vendor library can support a given X screen. If this
* returns false, then libGLX will fall back to the indirect rendering
* library (if one exists).
*
* \param dpy The display connection.
* \param screen The screen number.
* \return True if the vendor library can support this screen.
*/
Bool (* isScreenSupported) (Display *dpy, int screen);
/*!
* This retrieves the pointer to the real GLX or core GL function.
*
* \param procName The name of the function.
* \return A pointer to a function, or \c NULL if the vendor does not
* support the function.
*/
void *(*getProcAddress) (const GLubyte *procName);
/*!
* This retrieves vendor-neutral functions which use the
* __GLXdispatchTableDynamic API above to dispatch to the correct vendor.
*
* A vendor library must provide a dispatch function for all GLX functions
* that it supports. If \c getDispatchAddress returns NULL, but
* \c getProcAddress returns non-NULL, then libGLX will assume that the
* function is a GL function, not GLX.
*
* That allows libGLX to dispatch GL and GLX functions correctly, even in
* the case of a GL function that starts with "glX".
*
* \param procName The name of the function.
* \return A pointer to a function, or \c NULL if the vendor does not
* support the function or \p procName is not a GLX function.
*/
void *(*getDispatchAddress) (const GLubyte *procName);
/*!
* This notifies the vendor library which dispatch table index is
* assigned to a particular GLX extension function.
*/
void (*setDispatchIndex) (const GLubyte *procName, int index);
/*!
* (OPTIONAL) This notifies the vendor library when an X error was
* generated due to a detected error in the GLX API stream.
*
* This may be \c NULL, in which case the vendor library is not notified of
* any errors.
*
* \note this is a notification only -- libGLX takes care of actually
* reporting the error.
*
* \param dpy The display connection.
* \param error The error code.
* \param resid The XID associated with the error, if any.
* \param opcode The minor opcode of the function that generated the error.
* \param coreX11error True if the error code is a core X11 error, or False
* if it's a GLX error code.
*
* \return True if libGLX should report the error to the application.
*/
Bool (*notifyError) (Display *dpy, unsigned char error,
XID resid, unsigned char opcode,
Bool coreX11error);
/*
* The vendor library may use the isPatchSupported, initiatePatch,
* releasePatch, and patchThreadAttach callbacks to re-write libglvnd's
* entrypoints at make current time, provided no other contexts are current
* and the TLS model supports this functionality. This is a performance
* optimization that may not be available at runtime; the vendor library
* must not depend on this functionality for correctness.
*
* To use this optimization, the vendor library must provide at least the
* isPatchSupported and initiatePatch entrypoints.
*/
/*!
* (OPTIONAL) Checks to see if the vendor library supports patching the
* given stub type and size.
*
* \param type The type of entrypoints. This will be a one of the
* __GLDISPATCH_STUB_* values.
* \param stubSize The maximum size of the stub that the vendor library can
* write, in bytes.
* \param lookupStubOffset A callback into libglvnd to look up the address
* of each entrypoint.
*/
GLboolean (* isPatchSupported)(int type, int stubSize);
/*!
* (OPTIONAL) Called by libglvnd to request that a vendor library patch its
* top-level entrypoints.
*
* The vendor library should use the \p lookupStubOffset callback to find
* the addresses of each entrypoint.
*
* This function may be called more than once to patch multiple sets of
* entrypoints. For example, depending on how they're built, libOpenGL.so
* or libGL.so may have their own entrypoints that are separate functions
* from the ones in libGLdispatch.
*
* Note that during this call is the only time that the entrypoints can be
* modified. After the call to \c initiatePatch returns, the vendor library
* should treat the entrypoints as read-only.
*
* \param type The type of entrypoints. This will be a one of the
* __GLDISPATCH_STUB_* values.
* \param stubSize The maximum size of the stub that the vendor library can
* write, in bytes.
* \param lookupStubOffset A callback into libglvnd to look up the address
* of each entrypoint.
*
* \return GL_TRUE if the vendor library supports patching with this type
* and size.
*/
GLboolean (*initiatePatch)(int type,
int stubSize,
DispatchPatchLookupStubOffset lookupStubOffset);
/*!
* (OPTIONAL) Called by libglvnd to notify the current vendor that it no
* longer owns the top-level entrypoints.
*
* Libglvnd will take care of the restoring the entrypoints back to their
* original state. The vendor library must not try to modify them.
*/
void (*releasePatch)(void);
/*!
* (OPTIONAL) Called at the start of window-system functions (GLX and EGL).
* This callback allows vendor libraries to perform any per-thread
* initialization.
*
* This is basically a workaround for broken applications. A lot of apps
* will make one or more invalid GLX/EGL calls on a thread (often including
* a MakeCurrent with invalid parameters), and then will try to call an
* OpenGL function.
*
* A non-libglvnd-based driver would be able to initialize any thread state
* even on a bogus GLX call, but with libglvnd, those calls wouldn't get
* past libGLX.
*
* This function is optional. If it's \c NULL, then libGLdispatch will
* simply ignore it.
*
* \note This function may be called concurrently from multiple threads.
*/
void (*patchThreadAttach)(void);
} __GLXapiImports;
/*****************************************************************************/
#define __GLX_MAIN_PROTO_NAME "__glx_Main"
#define __GLX_MAIN_PROTO(version, exports, vendor, imports) \
Bool __glx_Main(uint32_t version, \
const __GLXapiExports *exports, \
__GLXvendorInfo *vendor, \
__GLXapiImports *imports)
typedef Bool (*__PFNGLXMAINPROC)
(uint32_t version, const __GLXapiExports *exports, __GLXvendorInfo *vendor, __GLXapiImports *imports);
/*!
* Vendor libraries must export a function called __glx_Main() with the
* following prototype.
*
* This function also performs a handshake based on the ABI version number.
* Vendor libraries can optionally use the version number to support older
* versions of the ABI.
*
* \param[in] version The ABI version. The upper 16 bits contains the major version
* number, and the lower 16 bits contains the minor version number.
*
* \param[in] exports The table of functions provided by libGLX. This pointer will
* remain valid for as long as the vendor is loaded.
*
* \param[in] vendor The opaque pointer used to identify this vendor library. This
* may be used in future versions to provide additional per-vendor information.
*
* \param[out] imports The function table that the vendor library should fill
* in. The vendor library must assign every non-optional function in the
* struct.
*
* \return True on success. If the vendor library does not support the
* requested ABI version or if some other error occurs, then it should return
* False.
*/
Bool __glx_Main(uint32_t version,
const __GLXapiExports *exports,
__GLXvendorInfo *vendor,
__GLXapiImports *imports);
/*!
* @}
*/
#if defined(__cplusplus)
}
#endif
#endif /* __LIB_GLX_ABI_H */