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/*
* Copyright © 2013 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS 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 SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include <assert.h>
#include <string.h>
#include <stdio.h>
#include "dispatch_common.h"
static bool first_context_current = false;
static bool already_switched_to_dispatch_table = false;
/**
* If we can determine the WGL extension support from the current
* context, then return that, otherwise give the answer that will just
* send us on to get_proc_address().
*/
bool
epoxy_conservative_has_wgl_extension(const char *ext)
{
HDC hdc = wglGetCurrentDC();
if (!hdc)
return true;
return epoxy_has_wgl_extension(hdc, ext);
}
bool
epoxy_has_wgl_extension(HDC hdc, const char *ext)
{
PFNWGLGETEXTENSIONSSTRINGARBPROC getext;
getext = (void *)wglGetProcAddress("wglGetExtensionsStringARB");
if (!getext) {
fputs("Implementation unexpectedly missing "
"WGL_ARB_extensions_string. Probably a libepoxy bug.\n",
stderr);
return false;
}
return epoxy_extension_in_string(getext(hdc), ext);
}
/**
* Does the work necessary to update the win32 per-thread dispatch
* tables when wglMakeCurrent() is called.
*
* Right now, we use global function pointers until the second
* MakeCurrent occurs, at which point we switch to dispatch tables.
* This could be improved in the future to track a resolved dispatch
* table per context and reuse it when the context is made current
* again.
*/
void
epoxy_handle_external_wglMakeCurrent(void)
{
if (!first_context_current) {
first_context_current = true;
} else {
if (!already_switched_to_dispatch_table) {
already_switched_to_dispatch_table = true;
gl_switch_to_dispatch_table();
wgl_switch_to_dispatch_table();
}
gl_init_dispatch_table();
wgl_init_dispatch_table();
}
}
/**
* This global symbol is apparently looked up by Windows when loading
* a DLL, but it doesn't declare the prototype.
*/
BOOL WINAPI
DllMain(HINSTANCE dll, DWORD reason, LPVOID reserved);
BOOL WINAPI
DllMain(HINSTANCE dll, DWORD reason, LPVOID reserved)
{
void *data;
switch (reason) {
case DLL_PROCESS_ATTACH:
gl_tls_index = TlsAlloc();
if (gl_tls_index == TLS_OUT_OF_INDEXES)
return FALSE;
wgl_tls_index = TlsAlloc();
if (wgl_tls_index == TLS_OUT_OF_INDEXES)
return FALSE;
first_context_current = false;
/* FALLTHROUGH */
case DLL_THREAD_ATTACH:
data = LocalAlloc(LPTR, gl_tls_size);
TlsSetValue(gl_tls_index, data);
data = LocalAlloc(LPTR, wgl_tls_size);
TlsSetValue(wgl_tls_index, data);
break;
case DLL_THREAD_DETACH:
case DLL_PROCESS_DETACH:
data = TlsGetValue(gl_tls_index);
LocalFree(data);
data = TlsGetValue(wgl_tls_index);
LocalFree(data);
if (reason == DLL_PROCESS_DETACH) {
TlsFree(gl_tls_index);
TlsFree(wgl_tls_index);
}
break;
}
return TRUE;
}
WRAPPER_VISIBILITY (BOOL)
WRAPPER(epoxy_wglMakeCurrent)(HDC hdc, HGLRC hglrc)
{
BOOL ret = epoxy_wglMakeCurrent_unwrapped(hdc, hglrc);
epoxy_handle_external_wglMakeCurrent();
return ret;
}
WRAPPER_VISIBILITY (BOOL)
WRAPPER(epoxy_wglMakeContextCurrentARB)(HDC hDrawDC,
HDC hReadDC,
HGLRC hglrc)
{
BOOL ret = epoxy_wglMakeContextCurrentARB_unwrapped(hDrawDC, hReadDC,
hglrc);
epoxy_handle_external_wglMakeCurrent();
return ret;
}
WRAPPER_VISIBILITY (BOOL)
WRAPPER(epoxy_wglMakeContextCurrentEXT)(HDC hDrawDC,
HDC hReadDC,
HGLRC hglrc)
{
BOOL ret = epoxy_wglMakeContextCurrentEXT_unwrapped(hDrawDC, hReadDC,
hglrc);
epoxy_handle_external_wglMakeCurrent();
return ret;
}
WRAPPER_VISIBILITY (BOOL)
WRAPPER(epoxy_wglMakeAssociatedContextCurrentAMD)(HGLRC hglrc)
{
BOOL ret = epoxy_wglMakeAssociatedContextCurrentAMD_unwrapped(hglrc);
epoxy_handle_external_wglMakeCurrent();
return ret;
}
PFNWGLMAKECURRENTPROC epoxy_wglMakeCurrent = epoxy_wglMakeCurrent_wrapped;
PFNWGLMAKECONTEXTCURRENTEXTPROC epoxy_wglMakeContextCurrentEXT = epoxy_wglMakeContextCurrentEXT_wrapped;
PFNWGLMAKECONTEXTCURRENTARBPROC epoxy_wglMakeContextCurrentARB = epoxy_wglMakeContextCurrentARB_wrapped;
PFNWGLMAKEASSOCIATEDCONTEXTCURRENTAMDPROC epoxy_wglMakeAssociatedContextCurrentEXT = epoxy_wglMakeAssociatedContextCurrentAMD_wrapped;