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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 16:49:04 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 16:49:04 +0000
commit16f504a9dca3fe3b70568f67b7d41241ae485288 (patch)
treec60f36ada0496ba928b7161059ba5ab1ab224f9d /src/VBox/Additions/3D/win/VBoxGL/VBoxGL.c
parentInitial commit. (diff)
downloadvirtualbox-upstream.tar.xz
virtualbox-upstream.zip
Adding upstream version 7.0.6-dfsg.upstream/7.0.6-dfsgupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/VBox/Additions/3D/win/VBoxGL/VBoxGL.c')
-rw-r--r--src/VBox/Additions/3D/win/VBoxGL/VBoxGL.c580
1 files changed, 580 insertions, 0 deletions
diff --git a/src/VBox/Additions/3D/win/VBoxGL/VBoxGL.c b/src/VBox/Additions/3D/win/VBoxGL/VBoxGL.c
new file mode 100644
index 00000000..9871bd6b
--- /dev/null
+++ b/src/VBox/Additions/3D/win/VBoxGL/VBoxGL.c
@@ -0,0 +1,580 @@
+/* $Id: VBoxGL.c $ */
+/** @file
+ * VirtualBox Windows Guest Mesa3D - OpenGL driver.
+ */
+
+/*
+ * Copyright (C) 2018-2022 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, in version 3 of the
+ * License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+#include "GaDrvEnvKMT.h"
+
+#include "stw_winsys.h"
+#include "stw_device.h"
+#include "stw_context.h"
+
+#include "pipe/p_state.h"
+#include "svga3d_reg.h"
+
+#include <iprt/asm.h>
+
+#include <common/wddm/VBoxMPIf.h>
+
+#include <Psapi.h>
+
+static const char *g_pszSvgaDll =
+#ifdef VBOX_WOW64
+ "VBoxSVGA-x86.dll"
+#else
+ "VBoxSVGA.dll"
+#endif
+;
+
+static struct GaDrvFunctions
+{
+ PFNGaDrvScreenCreate pfnGaDrvScreenCreate;
+ PFNGaDrvScreenDestroy pfnGaDrvScreenDestroy;
+ PFNGaDrvGetWDDMEnv pfnGaDrvGetWDDMEnv;
+ PFNGaDrvGetContextId pfnGaDrvGetContextId;
+ PFNGaDrvGetSurfaceId pfnGaDrvGetSurfaceId;
+ PFNGaDrvContextFlush pfnGaDrvContextFlush;
+} g_drvfuncs;
+
+
+static HMODULE gaDrvLoadSVGA(struct GaDrvFunctions *pDrvFuncs)
+{
+ struct VBOXWDDMDLLPROC aDrvProcs[] =
+ {
+ { "GaDrvScreenCreate", (FARPROC *)&pDrvFuncs->pfnGaDrvScreenCreate },
+ { "GaDrvScreenDestroy", (FARPROC *)&pDrvFuncs->pfnGaDrvScreenDestroy },
+ { "GaDrvGetWDDMEnv", (FARPROC *)&pDrvFuncs->pfnGaDrvGetWDDMEnv },
+ { "GaDrvGetContextId", (FARPROC *)&pDrvFuncs->pfnGaDrvGetContextId },
+ { "GaDrvGetSurfaceId", (FARPROC *)&pDrvFuncs->pfnGaDrvGetSurfaceId },
+ { "GaDrvContextFlush", (FARPROC *)&pDrvFuncs->pfnGaDrvContextFlush },
+ { NULL, NULL }
+ };
+
+ HMODULE hmod = VBoxWddmLoadSystemDll(g_pszSvgaDll);
+ if (hmod)
+ {
+ VBoxWddmLoadAdresses(hmod, aDrvProcs);
+ }
+ return hmod;
+}
+
+struct stw_shared_surface
+{
+ D3DKMT_HANDLE hResource;
+ D3DKMT_HANDLE hSurface;
+ uint32_t u32Sid;
+};
+
+static NTSTATUS vboxKmtPresent(D3DKMT_HANDLE hContext, HWND hwnd, D3DKMT_HANDLE hSource, LONG lWidth, LONG lHeight)
+{
+ RECT r;
+ r.left = 0;
+ r.top = 0;
+ r.right = lWidth;
+ r.bottom = lHeight;
+
+ D3DKMT_PRESENT PresentData;
+ memset(&PresentData, 0, sizeof(PresentData));
+ PresentData.hContext = hContext;
+ PresentData.hWindow = hwnd;
+ PresentData.hSource = hSource;
+ PresentData.hDestination = 0;
+ PresentData.Flags.Blt = 1;
+ PresentData.Flags.SrcRectValid = 1;
+ PresentData.Flags.DstRectValid = 1;
+ PresentData.SrcRect = r;
+ PresentData.SubRectCnt = 1;
+ PresentData.pSrcSubRects = &r;
+ PresentData.DstRect = r;
+
+ D3DKMTFUNCTIONS const *d3dkmt = D3DKMTFunctions();
+ NTSTATUS Status = d3dkmt->pfnD3DKMTPresent(&PresentData);
+ return Status;
+}
+
+NTSTATUS vboxKmtOpenSharedSurface(D3DKMT_HANDLE hAdapter, D3DKMT_HANDLE hDevice, D3DKMT_HANDLE hSharedSurface, struct stw_shared_surface *pSurf)
+{
+ D3DKMTFUNCTIONS const *d3dkmt = D3DKMTFunctions();
+
+ D3DKMT_QUERYRESOURCEINFO QueryResourceInfoData;
+ memset(&QueryResourceInfoData, 0, sizeof(QueryResourceInfoData));
+ QueryResourceInfoData.hDevice = hDevice;
+ QueryResourceInfoData.hGlobalShare = hSharedSurface;
+
+ NTSTATUS Status = d3dkmt->pfnD3DKMTQueryResourceInfo(&QueryResourceInfoData);
+ if (Status == STATUS_SUCCESS)
+ {
+ D3DDDI_OPENALLOCATIONINFO OpenAllocationInfoData;
+ memset(&OpenAllocationInfoData, 0, sizeof(OpenAllocationInfoData));
+
+ D3DKMT_OPENRESOURCE OpenResourceData;
+ memset(&OpenResourceData, 0, sizeof(OpenResourceData));
+ OpenResourceData.hDevice = hDevice;
+ OpenResourceData.hGlobalShare = hSharedSurface;
+ OpenResourceData.NumAllocations = 1;
+ OpenResourceData.pOpenAllocationInfo = &OpenAllocationInfoData;
+ if (QueryResourceInfoData.PrivateRuntimeDataSize)
+ {
+ OpenResourceData.pPrivateRuntimeData = malloc(QueryResourceInfoData.PrivateRuntimeDataSize);
+ if (OpenResourceData.pPrivateRuntimeData == NULL)
+ {
+ Status = STATUS_NOT_SUPPORTED;
+ }
+ OpenResourceData.PrivateRuntimeDataSize = QueryResourceInfoData.PrivateRuntimeDataSize;
+ }
+ if (QueryResourceInfoData.ResourcePrivateDriverDataSize)
+ {
+ OpenResourceData.pResourcePrivateDriverData = malloc(QueryResourceInfoData.ResourcePrivateDriverDataSize);
+ if (OpenResourceData.pResourcePrivateDriverData == NULL)
+ {
+ Status = STATUS_NOT_SUPPORTED;
+ }
+ OpenResourceData.ResourcePrivateDriverDataSize = QueryResourceInfoData.ResourcePrivateDriverDataSize;
+ }
+ if (QueryResourceInfoData.TotalPrivateDriverDataSize)
+ {
+ OpenResourceData.pTotalPrivateDriverDataBuffer = malloc(QueryResourceInfoData.TotalPrivateDriverDataSize);
+ if (OpenResourceData.pTotalPrivateDriverDataBuffer == NULL)
+ {
+ Status = STATUS_NOT_SUPPORTED;
+ }
+ OpenResourceData.TotalPrivateDriverDataBufferSize = QueryResourceInfoData.TotalPrivateDriverDataSize;
+ }
+
+ if (Status == STATUS_SUCCESS)
+ {
+ Status = d3dkmt->pfnD3DKMTOpenResource(&OpenResourceData);
+ if (Status == STATUS_SUCCESS)
+ {
+ if (OpenAllocationInfoData.PrivateDriverDataSize == sizeof(VBOXWDDM_ALLOCINFO))
+ {
+ VBOXWDDM_ALLOCINFO *pVBoxAllocInfo = (VBOXWDDM_ALLOCINFO *)OpenAllocationInfoData.pPrivateDriverData;
+ pSurf->hResource = OpenResourceData.hResource;
+ pSurf->hSurface = OpenAllocationInfoData.hAllocation;
+ pSurf->u32Sid = pVBoxAllocInfo->hostID;
+ }
+ else if (OpenAllocationInfoData.PrivateDriverDataSize == sizeof(VBOXDXALLOCATIONDESC))
+ {
+ //VBOXDXALLOCATIONDESC *pAllocDesc = (VBOXDXALLOCATIONDESC *)OpenAllocationInfoData.PrivateDriverDataSize;
+ pSurf->hResource = OpenResourceData.hResource;
+ pSurf->hSurface = OpenAllocationInfoData.hAllocation;
+
+ VBOXDISPIFESCAPE_SVGAGETSID data;
+ memset(&data, 0, sizeof(data));
+ data.EscapeHdr.escapeCode = VBOXESC_SVGAGETSID;
+ data.hAllocation = OpenAllocationInfoData.hAllocation;
+ // data.u32Sid = 0;
+
+ D3DKMT_ESCAPE EscapeData;
+ memset(&EscapeData, 0, sizeof(EscapeData));
+ EscapeData.hAdapter = hAdapter;
+ EscapeData.hDevice = hDevice;
+ EscapeData.Type = D3DKMT_ESCAPE_DRIVERPRIVATE;
+ // EscapeData.Flags.HardwareAccess = 0;
+ EscapeData.pPrivateDriverData = &data;
+ EscapeData.PrivateDriverDataSize = sizeof(data);
+ // EscapeData.hContext = 0;
+ Status = d3dkmt->pfnD3DKMTEscape(&EscapeData);
+ if (Status == STATUS_SUCCESS)
+ pSurf->u32Sid = data.u32Sid;
+ else
+ Assert(0);
+ }
+ else
+ Assert(0);
+ }
+ }
+
+ if (OpenResourceData.pPrivateRuntimeData != NULL)
+ {
+ free(OpenResourceData.pPrivateRuntimeData);
+ }
+ if (OpenResourceData.pResourcePrivateDriverData != NULL)
+ {
+ free(OpenResourceData.pResourcePrivateDriverData);
+ }
+ if (OpenResourceData.pTotalPrivateDriverDataBuffer != NULL)
+ {
+ free(OpenResourceData.pTotalPrivateDriverDataBuffer);
+ }
+ }
+
+ return Status;
+}
+
+NTSTATUS vboxKmtCloseSharedSurface(D3DKMT_HANDLE hDevice, struct stw_shared_surface *pSurf)
+{
+ D3DKMTFUNCTIONS const *d3dkmt = D3DKMTFunctions();
+
+ D3DKMT_DESTROYALLOCATION DestroyAllocationData;
+ memset(&DestroyAllocationData, 0, sizeof(DestroyAllocationData));
+ DestroyAllocationData.hDevice = hDevice;
+ DestroyAllocationData.hResource = pSurf->hResource;
+ /* "If the OpenGL ICD sets the handle in the hResource member to a non-NULL value,
+ * the ICD must set phAllocationList to NULL." and
+ * "the AllocationCount member is ignored by the OpenGL runtime."
+ */
+ // DestroyAllocationData.phAllocationList = NULL;
+ // DestroyAllocationData.AllocationCount = 0;
+
+ NTSTATUS Status = d3dkmt->pfnD3DKMTDestroyAllocation(&DestroyAllocationData);
+ Assert(Status == STATUS_SUCCESS);
+ return Status;
+}
+
+
+static struct pipe_screen *
+wddm_screen_create(HDC hDC)
+{
+ RT_NOREF(hDC); /** @todo Use it? */
+ struct pipe_screen *screen = NULL;
+
+ if (gaDrvLoadSVGA(&g_drvfuncs))
+ {
+ WDDMGalliumDriverEnv const *pEnv = GaDrvEnvKmtCreate();
+ if (pEnv)
+ {
+ /// @todo pEnv to include destructor callback, to be called from winsys screen destructor?
+ screen = g_drvfuncs.pfnGaDrvScreenCreate(pEnv);
+ }
+ }
+
+ return screen;
+}
+
+static void
+wddm_present(struct pipe_screen *screen,
+ struct pipe_context *context,
+ struct pipe_resource *res,
+ HDC hDC)
+{
+ RT_NOREF(context);
+ struct stw_context *ctx = stw_current_context();
+ struct pipe_context *pipe = ctx->st->pipe;
+
+ const WDDMGalliumDriverEnv *pEnv = g_drvfuncs.pfnGaDrvGetWDDMEnv(screen);
+ if (pEnv)
+ {
+ /* Get context and kernel-mode handle of the resource. */
+ uint32_t u32Cid = g_drvfuncs.pfnGaDrvGetContextId(pipe);
+ D3DKMT_HANDLE hContext = GaDrvEnvKmtContextHandle(pEnv, u32Cid);
+
+ uint32_t u32SourceSid = g_drvfuncs.pfnGaDrvGetSurfaceId(screen, res);
+ D3DKMT_HANDLE hSource = GaDrvEnvKmtSurfaceHandle(pEnv, u32SourceSid);
+
+ HWND hwnd = WindowFromDC(hDC);
+
+ vboxKmtPresent(hContext, hwnd, hSource, res->width0, res->height0);
+ }
+}
+
+static boolean
+wddm_get_adapter_luid(struct pipe_screen *screen,
+ HDC hDC,
+ LUID *pAdapterLuid)
+{
+ RT_NOREF(hDC); /** @todo Use it? */
+ const WDDMGalliumDriverEnv *pEnv = g_drvfuncs.pfnGaDrvGetWDDMEnv(screen);
+ if (pEnv)
+ {
+ GaDrvEnvKmtAdapterLUID(pEnv, pAdapterLuid);
+ return true;
+ }
+
+ return false;
+}
+
+static struct stw_shared_surface *
+wddm_shared_surface_open(struct pipe_screen *screen,
+ HANDLE hSharedSurface)
+{
+ struct stw_shared_surface *surface = NULL;
+
+ const WDDMGalliumDriverEnv *pEnv = g_drvfuncs.pfnGaDrvGetWDDMEnv(screen);
+ if (pEnv)
+ {
+ surface = (struct stw_shared_surface *)malloc(sizeof(struct stw_shared_surface));
+ if (surface)
+ {
+ D3DKMT_HANDLE hAdapter = GaDrvEnvKmtAdapterHandle(pEnv);
+ D3DKMT_HANDLE hDevice = GaDrvEnvKmtDeviceHandle(pEnv);
+ NTSTATUS Status = vboxKmtOpenSharedSurface(hAdapter, hDevice, (D3DKMT_HANDLE)(uintptr_t)hSharedSurface, surface);
+ if (Status != STATUS_SUCCESS)
+ {
+ free(surface);
+ surface = NULL;
+ }
+ }
+ }
+ return surface;
+}
+
+static void
+wddm_shared_surface_close(struct pipe_screen *screen,
+ struct stw_shared_surface *surface)
+{
+ const WDDMGalliumDriverEnv *pEnv = g_drvfuncs.pfnGaDrvGetWDDMEnv(screen);
+ if (pEnv)
+ {
+ D3DKMT_HANDLE hDevice = GaDrvEnvKmtDeviceHandle(pEnv);
+ vboxKmtCloseSharedSurface(hDevice, surface);
+ }
+ free(surface);
+}
+
+static void
+wddm_compose(struct pipe_screen *screen,
+ struct pipe_resource *res,
+ struct stw_shared_surface *dest,
+ LPCRECT pRect,
+ ULONGLONG PresentHistoryToken)
+{
+ struct stw_context *ctx = stw_current_context();
+ struct pipe_context *pipe = ctx->st->pipe;
+
+ /* The ICD asked to present something, make sure that any outstanding commends are submitted. */
+ g_drvfuncs.pfnGaDrvContextFlush(pipe);
+
+ uint32_t u32SourceSid = g_drvfuncs.pfnGaDrvGetSurfaceId(screen, res);
+
+ /* Generate SVGA_3D_CMD_SURFACE_COPY command for these resources. */
+ struct
+ {
+ SVGA3dCmdHeader header;
+ SVGA3dCmdSurfaceCopy surfaceCopy;
+ SVGA3dCopyBox box;
+ } command;
+
+ command.header.id = SVGA_3D_CMD_SURFACE_COPY;
+ command.header.size = sizeof(command) - sizeof(SVGA3dCmdHeader);
+
+ command.surfaceCopy.src.sid = u32SourceSid;
+ command.surfaceCopy.src.face = 0;
+ command.surfaceCopy.src.mipmap = 0;
+ command.surfaceCopy.dest.sid = dest->u32Sid;
+ command.surfaceCopy.dest.face = 0;
+ command.surfaceCopy.dest.mipmap = 0;
+
+ command.box.x = pRect->left;
+ command.box.y = pRect->top;
+ command.box.z = 0;
+ command.box.w = pRect->right - pRect->left;
+ command.box.h = pRect->bottom - pRect->top;
+ command.box.d = 1;
+ command.box.srcx = 0;
+ command.box.srcy = 0;
+ command.box.srcz = 0;
+
+ const WDDMGalliumDriverEnv *pEnv = g_drvfuncs.pfnGaDrvGetWDDMEnv(screen);
+ if (pEnv)
+ {
+ uint32_t u32Cid = g_drvfuncs.pfnGaDrvGetContextId(pipe);
+ GaDrvEnvKmtRenderCompose(pEnv, u32Cid, &command, sizeof(command), PresentHistoryToken);
+ }
+}
+
+static unsigned
+wddm_get_pfd_flags(struct pipe_screen *screen)
+{
+ (void)screen;
+ return stw_pfd_gdi_support | stw_pfd_double_buffer;
+}
+
+static const char *
+wddm_get_name(void)
+{
+ return "VBoxGL";
+}
+
+static const struct stw_winsys stw_winsys = {
+ wddm_screen_create,
+ wddm_present,
+ wddm_get_adapter_luid,
+ wddm_shared_surface_open,
+ wddm_shared_surface_close,
+ wddm_compose,
+ wddm_get_pfd_flags,
+ NULL, /* create_framebuffer */
+ wddm_get_name,
+};
+
+#ifdef DEBUG
+typedef BOOL WINAPI FNGetModuleInformation(HANDLE hProcess, HMODULE hModule, LPMODULEINFO lpmodinfo, DWORD cb);
+typedef FNGetModuleInformation *PFNGetModuleInformation;
+
+static PFNGetModuleInformation g_pfnGetModuleInformation = NULL;
+static HMODULE g_hModPsapi = NULL;
+static PVOID g_VBoxWDbgVEHandler = NULL;
+
+static bool vboxVDbgIsAddressInModule(PVOID pv, const char *pszModuleName)
+{
+ HMODULE hMod = GetModuleHandleA(pszModuleName);
+ if (!hMod)
+ return false;
+
+ if (!g_pfnGetModuleInformation)
+ return false;
+
+ HANDLE hProcess = GetCurrentProcess();
+ MODULEINFO ModuleInfo = {0};
+ if (!g_pfnGetModuleInformation(hProcess, hMod, &ModuleInfo, sizeof(ModuleInfo)))
+ return false;
+
+ return (uintptr_t)ModuleInfo.lpBaseOfDll <= (uintptr_t)pv
+ && (uintptr_t)pv < (uintptr_t)ModuleInfo.lpBaseOfDll + ModuleInfo.SizeOfImage;
+}
+
+static bool vboxVDbgIsExceptionIgnored(PEXCEPTION_RECORD pExceptionRecord)
+{
+ /* Module (dll) names for GetModuleHandle.
+ * Exceptions originated from these modules will be ignored.
+ */
+ static const char *apszIgnoredModuleNames[] =
+ {
+ NULL
+ };
+
+ int i = 0;
+ while (apszIgnoredModuleNames[i])
+ {
+ if (vboxVDbgIsAddressInModule(pExceptionRecord->ExceptionAddress, apszIgnoredModuleNames[i]))
+ return true;
+
+ ++i;
+ }
+
+ return false;
+}
+
+static LONG WINAPI vboxVDbgVectoredHandler(struct _EXCEPTION_POINTERS *pExceptionInfo) RT_NOTHROW_DEF
+{
+ static volatile bool g_fAllowIgnore = true; /* Might be changed in kernel debugger. */
+
+ PEXCEPTION_RECORD pExceptionRecord = pExceptionInfo->ExceptionRecord;
+ /* PCONTEXT pContextRecord = pExceptionInfo->ContextRecord; */
+
+ switch (pExceptionRecord->ExceptionCode)
+ {
+ default:
+ break;
+ case EXCEPTION_BREAKPOINT:
+ case EXCEPTION_ACCESS_VIOLATION:
+ case EXCEPTION_STACK_OVERFLOW:
+ case EXCEPTION_ARRAY_BOUNDS_EXCEEDED:
+ case EXCEPTION_FLT_DIVIDE_BY_ZERO:
+ case EXCEPTION_FLT_INVALID_OPERATION:
+ case EXCEPTION_INT_DIVIDE_BY_ZERO:
+ case EXCEPTION_ILLEGAL_INSTRUCTION:
+ if (g_fAllowIgnore && vboxVDbgIsExceptionIgnored(pExceptionRecord))
+ break;
+ ASMBreakpoint();
+ break;
+ case 0x40010006: /* OutputDebugStringA? */
+ case 0x4001000a: /* OutputDebugStringW? */
+ break;
+ }
+ return EXCEPTION_CONTINUE_SEARCH;
+}
+
+static void vboxVDbgVEHandlerRegister(void)
+{
+ Assert(!g_VBoxWDbgVEHandler);
+ g_VBoxWDbgVEHandler = AddVectoredExceptionHandler(1, vboxVDbgVectoredHandler);
+ Assert(g_VBoxWDbgVEHandler);
+
+ g_hModPsapi = GetModuleHandleA("Psapi.dll"); /* Usually already loaded. */
+ if (g_hModPsapi)
+ g_pfnGetModuleInformation = (PFNGetModuleInformation)GetProcAddress(g_hModPsapi, "GetModuleInformation");
+}
+
+static void vboxVDbgVEHandlerUnregister(void)
+{
+ Assert(g_VBoxWDbgVEHandler);
+ ULONG uResult = RemoveVectoredExceptionHandler(g_VBoxWDbgVEHandler);
+ Assert(uResult); RT_NOREF(uResult);
+ g_VBoxWDbgVEHandler = NULL;
+
+ g_hModPsapi = NULL;
+ g_pfnGetModuleInformation = NULL;
+}
+#endif /* DEBUG */
+
+BOOL WINAPI DllMain(HINSTANCE hDLLInst,
+ DWORD fdwReason,
+ LPVOID lpvReserved)
+{
+ RT_NOREF2(hDLLInst, lpvReserved);
+
+ switch (fdwReason)
+ {
+ case DLL_PROCESS_ATTACH:
+#ifdef DEBUG
+ vboxVDbgVEHandlerRegister();
+#endif
+ D3DKMTLoad();
+ stw_init(&stw_winsys);
+ stw_init_thread();
+ break;
+
+ case DLL_PROCESS_DETACH:
+#ifdef DEBUG
+ vboxVDbgVEHandlerUnregister();
+#endif
+ break;
+
+ case DLL_THREAD_ATTACH:
+ stw_init_thread();
+ break;
+
+ case DLL_THREAD_DETACH:
+ stw_cleanup_thread();
+ break;
+
+ default:
+ if (lpvReserved == NULL)
+ {
+ // We're being unloaded from the process.
+ stw_cleanup_thread();
+ stw_cleanup();
+ }
+ else
+ {
+ // Process itself is terminating, and all threads and modules are
+ // being detached.
+ //
+ // The order threads (including llvmpipe rasterizer threads) are
+ // destroyed can not be relied up, so it's not safe to cleanup.
+ //
+ // However global destructors (e.g., LLVM's) will still be called, and
+ // if Microsoft OPENGL32.DLL's DllMain is called after us, it will
+ // still try to invoke DrvDeleteContext to destroys all outstanding,
+ // so set stw_dev to NULL to return immediately if that happens.
+ stw_dev = NULL;
+ }
+ break;
+ }
+
+ return TRUE;
+}