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-rw-r--r--external/skia/share-grcontext.patch.1591
1 files changed, 591 insertions, 0 deletions
diff --git a/external/skia/share-grcontext.patch.1 b/external/skia/share-grcontext.patch.1
new file mode 100644
index 000000000..1c7da21d6
--- /dev/null
+++ b/external/skia/share-grcontext.patch.1
@@ -0,0 +1,591 @@
+diff --git a/tools/sk_app/VulkanWindowContext.cpp b/tools/sk_app/VulkanWindowContext.cpp
+index 970c67ec0c..371bd8ab0c 100644
+--- a/tools/sk_app/VulkanWindowContext.cpp
++++ b/tools/sk_app/VulkanWindowContext.cpp
+@@ -24,8 +24,10 @@
+ #undef CreateSemaphore
+ #endif
+
+-#define GET_PROC(F) f ## F = (PFN_vk ## F) fGetInstanceProcAddr(fInstance, "vk" #F)
+-#define GET_DEV_PROC(F) f ## F = (PFN_vk ## F) fGetDeviceProcAddr(fDevice, "vk" #F)
++#define GET_PROC(F) f ## F = (PFN_vk ## F) fGetInstanceProcAddr(fShared->fInstance, "vk" #F)
++#define GET_DEV_PROC(F) f ## F = (PFN_vk ## F) fGetDeviceProcAddr(fShared->fDevice, "vk" #F)
++#define GET_PROC_GLOBAL(F) fGlobalShared->f ## F = (PFN_vk ## F) fGetInstanceProcAddr(fGlobalShared->fInstance, "vk" #F)
++#define GET_DEV_PROC_GLOBAL(F) fGlobalShared->f ## F = (PFN_vk ## F) fGetDeviceProcAddr(fGlobalShared->fDevice, "vk" #F)
+
+ namespace sk_app {
+
+@@ -49,6 +51,14 @@ VulkanWindowContext::VulkanWindowContext(const DisplayParams& params,
+ }
+
+ void VulkanWindowContext::initializeContext() {
++ fShared = fGlobalShared;
++ if( !fShared )
++ {
++ // TODO do we need a mutex?
++
++ fGlobalShared = sk_make_sp<Shared>();
++ Shared* d = fGlobalShared.get(); // shorter variable name
++
+ // any config code here (particularly for msaa)?
+
+ PFN_vkGetInstanceProcAddr getInstanceProc = fGetInstanceProcAddr;
+@@ -62,24 +72,25 @@ void VulkanWindowContext::initializeContext() {
+ };
+ GrVkBackendContext backendContext;
+ GrVkExtensions extensions;
+- VkPhysicalDeviceFeatures2 features;
+- if (!sk_gpu_test::CreateVkBackendContext(getProc, &backendContext, &extensions, &features,
+- &fDebugCallback, &fPresentQueueIndex, fCanPresentFn)) {
+- sk_gpu_test::FreeVulkanFeaturesStructs(&features);
++ if (!sk_gpu_test::CreateVkBackendContext(getProc, &backendContext, &extensions, &d->features,
++ &d->fDebugCallback, &d->fPresentQueueIndex, fCanPresentFn)) {
++ sk_gpu_test::FreeVulkanFeaturesStructs(&d->features);
++ fGlobalShared.reset();
+ return;
+ }
+
+ if (!extensions.hasExtension(VK_KHR_SURFACE_EXTENSION_NAME, 25) ||
+ !extensions.hasExtension(VK_KHR_SWAPCHAIN_EXTENSION_NAME, 68)) {
+- sk_gpu_test::FreeVulkanFeaturesStructs(&features);
++ sk_gpu_test::FreeVulkanFeaturesStructs(&d->features);
++ fGlobalShared.reset();
+ return;
+ }
+
+- fInstance = backendContext.fInstance;
+- fPhysicalDevice = backendContext.fPhysicalDevice;
+- fDevice = backendContext.fDevice;
+- fGraphicsQueueIndex = backendContext.fGraphicsQueueIndex;
+- fGraphicsQueue = backendContext.fQueue;
++ d->fInstance = backendContext.fInstance;
++ d->fPhysicalDevice = backendContext.fPhysicalDevice;
++ d->fDevice = backendContext.fDevice;
++ d->fGraphicsQueueIndex = backendContext.fGraphicsQueueIndex;
++ d->fGraphicsQueue = backendContext.fQueue;
+
+ PFN_vkGetPhysicalDeviceProperties localGetPhysicalDeviceProperties =
+ reinterpret_cast<PFN_vkGetPhysicalDeviceProperties>(
+@@ -87,21 +98,30 @@ void VulkanWindowContext::initializeContext() {
+ backendContext.fInstance,
+ VK_NULL_HANDLE));
+ if (!localGetPhysicalDeviceProperties) {
+- sk_gpu_test::FreeVulkanFeaturesStructs(&features);
++ sk_gpu_test::FreeVulkanFeaturesStructs(&d->features);
++ fGlobalShared.reset();
+ return;
+ }
+- VkPhysicalDeviceProperties physDeviceProperties;
+- localGetPhysicalDeviceProperties(backendContext.fPhysicalDevice, &physDeviceProperties);
+- uint32_t physDevVersion = physDeviceProperties.apiVersion;
++ localGetPhysicalDeviceProperties(backendContext.fPhysicalDevice, &d->physDeviceProperties);
++ uint32_t physDevVersion = d->physDeviceProperties.apiVersion;
+
+- fInterface.reset(new GrVkInterface(backendContext.fGetProc, fInstance, fDevice,
++ d->fInterface.reset(new GrVkInterface(backendContext.fGetProc, d->fInstance, d->fDevice,
+ backendContext.fInstanceVersion, physDevVersion,
+ &extensions));
+
+- GET_PROC(DestroyInstance);
+- if (fDebugCallback != VK_NULL_HANDLE) {
+- GET_PROC(DestroyDebugReportCallbackEXT);
++ d->fContext = GrContext::MakeVulkan(backendContext, fDisplayParams.fGrContextOptions);
++
++ GET_PROC_GLOBAL(DestroyInstance);
++ GET_DEV_PROC_GLOBAL(DestroyDevice);
++ if (fGlobalShared->fDebugCallback != VK_NULL_HANDLE) {
++ GET_PROC_GLOBAL(DestroyDebugReportCallbackEXT);
+ }
++
++ fShared = fGlobalShared;
++ } // if( !fShared )
++
++ fContext = fShared->fContext;
++
+ GET_PROC(DestroySurfaceKHR);
+ GET_PROC(GetPhysicalDeviceSurfaceSupportKHR);
+ GET_PROC(GetPhysicalDeviceSurfaceCapabilitiesKHR);
+@@ -109,7 +129,6 @@ void VulkanWindowContext::initializeContext() {
+ GET_PROC(GetPhysicalDeviceSurfacePresentModesKHR);
+ GET_DEV_PROC(DeviceWaitIdle);
+ GET_DEV_PROC(QueueWaitIdle);
+- GET_DEV_PROC(DestroyDevice);
+ GET_DEV_PROC(CreateSwapchainKHR);
+ GET_DEV_PROC(DestroySwapchainKHR);
+ GET_DEV_PROC(GetSwapchainImagesKHR);
+@@ -117,46 +136,44 @@ void VulkanWindowContext::initializeContext() {
+ GET_DEV_PROC(QueuePresentKHR);
+ GET_DEV_PROC(GetDeviceQueue);
+
+- fContext = GrContext::MakeVulkan(backendContext, fDisplayParams.fGrContextOptions);
++ // No actual window, used just to create the shared GrContext.
++ if(fCreateVkSurfaceFn == nullptr)
++ return;
+
+- fSurface = fCreateVkSurfaceFn(fInstance);
++ fSurface = fCreateVkSurfaceFn(fShared->fInstance);
+ if (VK_NULL_HANDLE == fSurface) {
+ this->destroyContext();
+- sk_gpu_test::FreeVulkanFeaturesStructs(&features);
+ return;
+ }
+
++ // create presentQueue
++ fGetDeviceQueue(fShared->fDevice, fShared->fPresentQueueIndex, 0, &fPresentQueue);
++
+ VkBool32 supported;
+- VkResult res = fGetPhysicalDeviceSurfaceSupportKHR(fPhysicalDevice, fPresentQueueIndex,
++ VkResult res = fGetPhysicalDeviceSurfaceSupportKHR(fShared->fPhysicalDevice, fShared->fPresentQueueIndex,
+ fSurface, &supported);
+ if (VK_SUCCESS != res) {
+ this->destroyContext();
+- sk_gpu_test::FreeVulkanFeaturesStructs(&features);
+ return;
+ }
+
+ if (!this->createSwapchain(-1, -1, fDisplayParams)) {
+ this->destroyContext();
+- sk_gpu_test::FreeVulkanFeaturesStructs(&features);
+ return;
+ }
+-
+- // create presentQueue
+- fGetDeviceQueue(fDevice, fPresentQueueIndex, 0, &fPresentQueue);
+- sk_gpu_test::FreeVulkanFeaturesStructs(&features);
+ }
+
+ bool VulkanWindowContext::createSwapchain(int width, int height,
+ const DisplayParams& params) {
+ // check for capabilities
+ VkSurfaceCapabilitiesKHR caps;
+- VkResult res = fGetPhysicalDeviceSurfaceCapabilitiesKHR(fPhysicalDevice, fSurface, &caps);
++ VkResult res = fGetPhysicalDeviceSurfaceCapabilitiesKHR(fShared->fPhysicalDevice, fSurface, &caps);
+ if (VK_SUCCESS != res) {
+ return false;
+ }
+
+ uint32_t surfaceFormatCount;
+- res = fGetPhysicalDeviceSurfaceFormatsKHR(fPhysicalDevice, fSurface, &surfaceFormatCount,
++ res = fGetPhysicalDeviceSurfaceFormatsKHR(fShared->fPhysicalDevice, fSurface, &surfaceFormatCount,
+ nullptr);
+ if (VK_SUCCESS != res) {
+ return false;
+@@ -164,14 +181,14 @@ bool VulkanWindowContext::createSwapchain(int width, int height,
+
+ SkAutoMalloc surfaceFormatAlloc(surfaceFormatCount * sizeof(VkSurfaceFormatKHR));
+ VkSurfaceFormatKHR* surfaceFormats = (VkSurfaceFormatKHR*)surfaceFormatAlloc.get();
+- res = fGetPhysicalDeviceSurfaceFormatsKHR(fPhysicalDevice, fSurface, &surfaceFormatCount,
++ res = fGetPhysicalDeviceSurfaceFormatsKHR(fShared->fPhysicalDevice, fSurface, &surfaceFormatCount,
+ surfaceFormats);
+ if (VK_SUCCESS != res) {
+ return false;
+ }
+
+ uint32_t presentModeCount;
+- res = fGetPhysicalDeviceSurfacePresentModesKHR(fPhysicalDevice, fSurface, &presentModeCount,
++ res = fGetPhysicalDeviceSurfacePresentModesKHR(fShared->fPhysicalDevice, fSurface, &presentModeCount,
+ nullptr);
+ if (VK_SUCCESS != res) {
+ return false;
+@@ -179,7 +196,7 @@ bool VulkanWindowContext::createSwapchain(int width, int height,
+
+ SkAutoMalloc presentModeAlloc(presentModeCount * sizeof(VkPresentModeKHR));
+ VkPresentModeKHR* presentModes = (VkPresentModeKHR*)presentModeAlloc.get();
+- res = fGetPhysicalDeviceSurfacePresentModesKHR(fPhysicalDevice, fSurface, &presentModeCount,
++ res = fGetPhysicalDeviceSurfacePresentModesKHR(fShared->fPhysicalDevice, fSurface, &presentModeCount,
+ presentModes);
+ if (VK_SUCCESS != res) {
+ return false;
+@@ -286,8 +303,8 @@ bool VulkanWindowContext::createSwapchain(int width, int height,
+ swapchainCreateInfo.imageArrayLayers = 1;
+ swapchainCreateInfo.imageUsage = usageFlags;
+
+- uint32_t queueFamilies[] = { fGraphicsQueueIndex, fPresentQueueIndex };
+- if (fGraphicsQueueIndex != fPresentQueueIndex) {
++ uint32_t queueFamilies[] = { fShared->fGraphicsQueueIndex, fShared->fPresentQueueIndex };
++ if (fShared->fGraphicsQueueIndex != fShared->fPresentQueueIndex) {
+ swapchainCreateInfo.imageSharingMode = VK_SHARING_MODE_CONCURRENT;
+ swapchainCreateInfo.queueFamilyIndexCount = 2;
+ swapchainCreateInfo.pQueueFamilyIndices = queueFamilies;
+@@ -303,18 +320,18 @@ bool VulkanWindowContext::createSwapchain(int width, int height,
+ swapchainCreateInfo.clipped = true;
+ swapchainCreateInfo.oldSwapchain = fSwapchain;
+
+- res = fCreateSwapchainKHR(fDevice, &swapchainCreateInfo, nullptr, &fSwapchain);
++ res = fCreateSwapchainKHR(fShared->fDevice, &swapchainCreateInfo, nullptr, &fSwapchain);
+ if (VK_SUCCESS != res) {
+ return false;
+ }
+
+ // destroy the old swapchain
+ if (swapchainCreateInfo.oldSwapchain != VK_NULL_HANDLE) {
+- fDeviceWaitIdle(fDevice);
++ fDeviceWaitIdle(fShared->fDevice);
+
+ this->destroyBuffers();
+
+- fDestroySwapchainKHR(fDevice, swapchainCreateInfo.oldSwapchain, nullptr);
++ fDestroySwapchainKHR(fShared->fDevice, swapchainCreateInfo.oldSwapchain, nullptr);
+ }
+
+ this->createBuffers(swapchainCreateInfo.imageFormat, colorType,
+@@ -325,10 +342,10 @@ bool VulkanWindowContext::createSwapchain(int width, int height,
+
+ void VulkanWindowContext::createBuffers(VkFormat format, SkColorType colorType,
+ VkSharingMode sharingMode) {
+- fGetSwapchainImagesKHR(fDevice, fSwapchain, &fImageCount, nullptr);
++ fGetSwapchainImagesKHR(fShared->fDevice, fSwapchain, &fImageCount, nullptr);
+ SkASSERT(fImageCount);
+ fImages = new VkImage[fImageCount];
+- fGetSwapchainImagesKHR(fDevice, fSwapchain, &fImageCount, fImages);
++ fGetSwapchainImagesKHR(fShared->fDevice, fSwapchain, &fImageCount, fImages);
+
+ // set up initial image layouts and create surfaces
+ fImageLayouts = new VkImageLayout[fImageCount];
+@@ -343,7 +360,7 @@ void VulkanWindowContext::createBuffers(VkFormat format, SkColorType colorType,
+ info.fImageTiling = VK_IMAGE_TILING_OPTIMAL;
+ info.fFormat = format;
+ info.fLevelCount = 1;
+- info.fCurrentQueueFamily = fPresentQueueIndex;
++ info.fCurrentQueueFamily = fShared->fPresentQueueIndex;
+ info.fSharingMode = sharingMode;
+
+ if (fSampleCount == 1) {
+@@ -375,8 +392,8 @@ void VulkanWindowContext::createBuffers(VkFormat format, SkColorType colorType,
+ fBackbuffers = new BackbufferInfo[fImageCount + 1];
+ for (uint32_t i = 0; i < fImageCount + 1; ++i) {
+ fBackbuffers[i].fImageIndex = -1;
+- SkDEBUGCODE(VkResult result = )GR_VK_CALL(fInterface,
+- CreateSemaphore(fDevice, &semaphoreInfo, nullptr,
++ SkDEBUGCODE(VkResult result = )GR_VK_CALL(fShared->fInterface,
++ CreateSemaphore(fShared->fDevice, &semaphoreInfo, nullptr,
+ &fBackbuffers[i].fRenderSemaphore));
+ SkASSERT(result == VK_SUCCESS);
+ }
+@@ -388,8 +405,8 @@ void VulkanWindowContext::destroyBuffers() {
+ if (fBackbuffers) {
+ for (uint32_t i = 0; i < fImageCount + 1; ++i) {
+ fBackbuffers[i].fImageIndex = -1;
+- GR_VK_CALL(fInterface,
+- DestroySemaphore(fDevice,
++ GR_VK_CALL(fShared->fInterface,
++ DestroySemaphore(fShared->fDevice,
+ fBackbuffers[i].fRenderSemaphore,
+ nullptr));
+ }
+@@ -414,41 +431,59 @@ VulkanWindowContext::~VulkanWindowContext() {
+ void VulkanWindowContext::destroyContext() {
+ if (this->isValid()) {
+ fQueueWaitIdle(fPresentQueue);
+- fDeviceWaitIdle(fDevice);
++ fDeviceWaitIdle(fShared->fDevice);
+
+ this->destroyBuffers();
+
+ if (VK_NULL_HANDLE != fSwapchain) {
+- fDestroySwapchainKHR(fDevice, fSwapchain, nullptr);
++ fDestroySwapchainKHR(fShared->fDevice, fSwapchain, nullptr);
+ fSwapchain = VK_NULL_HANDLE;
+ }
+
+ if (VK_NULL_HANDLE != fSurface) {
+- fDestroySurfaceKHR(fInstance, fSurface, nullptr);
++ fDestroySurfaceKHR(fShared->fInstance, fSurface, nullptr);
+ fSurface = VK_NULL_HANDLE;
+ }
+ }
+
+ fContext.reset();
+- fInterface.reset();
++ fShared.reset();
++
++ checkDestroyShared();
++}
++
++void VulkanWindowContext::checkDestroyShared()
++{
++ if(!fGlobalShared || !fGlobalShared->unique()) // TODO mutex?
++ return;
++#ifndef SK_TRACE_VK_RESOURCES
++ if(!fGlobalShared->fContext->unique())
++ return;
++#endif
++ SkASSERT(fGlobalShared->fContext->unique());
++ fGlobalShared->fContext.reset();
++ fGlobalShared->fInterface.reset();
+
+- if (VK_NULL_HANDLE != fDevice) {
+- fDestroyDevice(fDevice, nullptr);
+- fDevice = VK_NULL_HANDLE;
++ if (VK_NULL_HANDLE != fGlobalShared->fDevice) {
++ fGlobalShared->fDestroyDevice(fGlobalShared->fDevice, nullptr);
++ fGlobalShared->fDevice = VK_NULL_HANDLE;
+ }
+
+ #ifdef SK_ENABLE_VK_LAYERS
+- if (fDebugCallback != VK_NULL_HANDLE) {
+- fDestroyDebugReportCallbackEXT(fInstance, fDebugCallback, nullptr);
++ if (fGlobalShared->fDebugCallback != VK_NULL_HANDLE) {
++ fGlobalShared->fDestroyDebugReportCallbackEXT(fGlobalShared->fInstance, fDebugCallback, nullptr);
+ }
+ #endif
+
+- fPhysicalDevice = VK_NULL_HANDLE;
++ fGlobalShared->fPhysicalDevice = VK_NULL_HANDLE;
+
+- if (VK_NULL_HANDLE != fInstance) {
+- fDestroyInstance(fInstance, nullptr);
+- fInstance = VK_NULL_HANDLE;
++ if (VK_NULL_HANDLE != fGlobalShared->fInstance) {
++ fGlobalShared->fDestroyInstance(fGlobalShared->fInstance, nullptr);
++ fGlobalShared->fInstance = VK_NULL_HANDLE;
+ }
++
++ sk_gpu_test::FreeVulkanFeaturesStructs(&fGlobalShared->features);
++ fGlobalShared.reset();
+ }
+
+ VulkanWindowContext::BackbufferInfo* VulkanWindowContext::getAvailableBackbuffer() {
+@@ -474,35 +509,35 @@ sk_sp<SkSurface> VulkanWindowContext::getBackbufferSurface() {
+ semaphoreInfo.pNext = nullptr;
+ semaphoreInfo.flags = 0;
+ VkSemaphore semaphore;
+- SkDEBUGCODE(VkResult result = )GR_VK_CALL(fInterface, CreateSemaphore(fDevice, &semaphoreInfo,
++ SkDEBUGCODE(VkResult result = )GR_VK_CALL(fShared->fInterface, CreateSemaphore(fShared->fDevice, &semaphoreInfo,
+ nullptr, &semaphore));
+ SkASSERT(result == VK_SUCCESS);
+
+ // acquire the image
+- VkResult res = fAcquireNextImageKHR(fDevice, fSwapchain, UINT64_MAX,
++ VkResult res = fAcquireNextImageKHR(fShared->fDevice, fSwapchain, UINT64_MAX,
+ semaphore, VK_NULL_HANDLE,
+ &backbuffer->fImageIndex);
+ if (VK_ERROR_SURFACE_LOST_KHR == res) {
+ // need to figure out how to create a new vkSurface without the platformData*
+ // maybe use attach somehow? but need a Window
+- GR_VK_CALL(fInterface, DestroySemaphore(fDevice, semaphore, nullptr));
++ GR_VK_CALL(fShared->fInterface, DestroySemaphore(fShared->fDevice, semaphore, nullptr));
+ return nullptr;
+ }
+ if (VK_ERROR_OUT_OF_DATE_KHR == res) {
+ // tear swapchain down and try again
+ if (!this->createSwapchain(-1, -1, fDisplayParams)) {
+- GR_VK_CALL(fInterface, DestroySemaphore(fDevice, semaphore, nullptr));
++ GR_VK_CALL(fShared->fInterface, DestroySemaphore(fShared->fDevice, semaphore, nullptr));
+ return nullptr;
+ }
+ backbuffer = this->getAvailableBackbuffer();
+
+ // acquire the image
+- res = fAcquireNextImageKHR(fDevice, fSwapchain, UINT64_MAX,
++ res = fAcquireNextImageKHR(fShared->fDevice, fSwapchain, UINT64_MAX,
+ semaphore, VK_NULL_HANDLE,
+ &backbuffer->fImageIndex);
+
+ if (VK_SUCCESS != res) {
+- GR_VK_CALL(fInterface, DestroySemaphore(fDevice, semaphore, nullptr));
++ GR_VK_CALL(fShared->fInterface, DestroySemaphore(fShared->fDevice, semaphore, nullptr));
+ return nullptr;
+ }
+ }
+@@ -528,7 +563,7 @@ void VulkanWindowContext::swapBuffers() {
+ GrFlushInfo info;
+ info.fNumSemaphores = 1;
+ info.fSignalSemaphores = &beSemaphore;
+- GrBackendSurfaceMutableState presentState(VK_IMAGE_LAYOUT_PRESENT_SRC_KHR, fPresentQueueIndex);
++ GrBackendSurfaceMutableState presentState(VK_IMAGE_LAYOUT_PRESENT_SRC_KHR, fShared->fPresentQueueIndex);
+ surface->flush(info, &presentState);
+ surface->getContext()->submit();
+
+@@ -548,4 +583,6 @@ void VulkanWindowContext::swapBuffers() {
+ fQueuePresentKHR(fPresentQueue, &presentInfo);
+ }
+
++SK_API sk_sp<VulkanWindowContext::Shared> VulkanWindowContext::fGlobalShared;
++
+ } //namespace sk_app
+diff --git a/tools/sk_app/VulkanWindowContext.h b/tools/sk_app/VulkanWindowContext.h
+index 5e245aff70..c6c866372f 100644
+--- a/tools/sk_app/VulkanWindowContext.h
++++ b/tools/sk_app/VulkanWindowContext.h
+@@ -19,18 +19,36 @@
+ #include "tools/gpu/vk/VkTestUtils.h"
+ #include "tools/sk_app/WindowContext.h"
+
++#include <cassert>
++
+ class GrRenderTarget;
+
+ namespace sk_app {
+
+-class VulkanWindowContext : public WindowContext {
++class SK_API VulkanWindowContext : public WindowContext {
++ struct Shared;
+ public:
+ ~VulkanWindowContext() override;
+
++ class SharedGrContext {
++ public:
++ SharedGrContext() {}
++ GrContext* getGrContext() { return shared ? shared->fContext.get() : nullptr; }
++ ~SharedGrContext() { shared.reset(); checkDestroyShared(); }
++ bool operator!() const { return !shared; }
++ void reset() { shared.reset(); }
++ private:
++ friend class VulkanWindowContext;
++ SharedGrContext(sk_sp<Shared>& sh ) : shared( sh ) {}
++ sk_sp<Shared> shared;
++ };
++
++ static SharedGrContext getSharedGrContext() { return SharedGrContext( fGlobalShared ); }
++
+ sk_sp<SkSurface> getBackbufferSurface() override;
+ void swapBuffers() override;
+
+- bool isValid() override { return fDevice != VK_NULL_HANDLE; }
++ bool isValid() override { return fSurface != VK_NULL_HANDLE; }
+
+ void resize(int w, int h) override {
+ this->createSwapchain(w, h, fDisplayParams);
+@@ -50,9 +68,15 @@ public:
+ VulkanWindowContext(const DisplayParams&, CreateVkSurfaceFn, CanPresentFn,
+ PFN_vkGetInstanceProcAddr, PFN_vkGetDeviceProcAddr);
+
++ static const VkPhysicalDeviceProperties& getPhysDeviceProperties() {
++ assert( fGlobalShared != nullptr );
++ return fGlobalShared->physDeviceProperties;
++ }
++
+ private:
+ void initializeContext();
+ void destroyContext();
++ static void checkDestroyShared();
+
+ struct BackbufferInfo {
+ uint32_t fImageIndex; // image this is associated with
+@@ -64,11 +88,6 @@ private:
+ void createBuffers(VkFormat format, SkColorType colorType, VkSharingMode);
+ void destroyBuffers();
+
+- VkInstance fInstance = VK_NULL_HANDLE;
+- VkPhysicalDevice fPhysicalDevice = VK_NULL_HANDLE;
+- VkDevice fDevice = VK_NULL_HANDLE;
+- VkDebugReportCallbackEXT fDebugCallback = VK_NULL_HANDLE;
+-
+ // Create functions
+ CreateVkSurfaceFn fCreateVkSurfaceFn;
+ CanPresentFn fCanPresentFn;
+@@ -90,20 +109,44 @@ private:
+ PFN_vkAcquireNextImageKHR fAcquireNextImageKHR = nullptr;
+ PFN_vkQueuePresentKHR fQueuePresentKHR = nullptr;
+
+- PFN_vkDestroyInstance fDestroyInstance = nullptr;
+ PFN_vkDeviceWaitIdle fDeviceWaitIdle = nullptr;
+- PFN_vkDestroyDebugReportCallbackEXT fDestroyDebugReportCallbackEXT = nullptr;
+ PFN_vkQueueWaitIdle fQueueWaitIdle = nullptr;
+- PFN_vkDestroyDevice fDestroyDevice = nullptr;
+ PFN_vkGetDeviceQueue fGetDeviceQueue = nullptr;
+
++ // We need to use just one GrContext, so share all the relevant data.
++ struct Shared : public SkRefCnt
++ {
++ PFN_vkDestroyInstance fDestroyInstance = nullptr;
++ PFN_vkDestroyDevice fDestroyDevice = nullptr;
++ PFN_vkDestroyDebugReportCallbackEXT fDestroyDebugReportCallbackEXT = nullptr;
++
++ VkInstance fInstance = VK_NULL_HANDLE;
++ VkPhysicalDevice fPhysicalDevice = VK_NULL_HANDLE;
++ VkDevice fDevice = VK_NULL_HANDLE;
++ VkDebugReportCallbackEXT fDebugCallback = VK_NULL_HANDLE;
++
+ sk_sp<const GrVkInterface> fInterface;
+
+- VkSurfaceKHR fSurface;
+- VkSwapchainKHR fSwapchain;
++ // Original code had this as a function-local variable, but that seems wrong.
++ // It should exist as long as the context exists.
++ VkPhysicalDeviceFeatures2 features;
++
++ // Store this to make it accessible.
++ VkPhysicalDeviceProperties physDeviceProperties;
++
+ uint32_t fGraphicsQueueIndex;
+ VkQueue fGraphicsQueue;
+ uint32_t fPresentQueueIndex;
++
++ sk_sp<GrContext> fContext;
++ };
++
++ sk_sp<Shared> fShared;
++
++ static sk_sp<Shared> fGlobalShared;
++
++ VkSurfaceKHR fSurface;
++ VkSwapchainKHR fSwapchain;
+ VkQueue fPresentQueue;
+
+ uint32_t fImageCount;
+diff --git a/tools/sk_app/unix/VulkanWindowContext_unix.cpp b/tools/sk_app/unix/VulkanWindowContext_unix.cpp
+index 6f0ce0aceb..877578cede 100644
+--- a/tools/sk_app/unix/VulkanWindowContext_unix.cpp
++++ b/tools/sk_app/unix/VulkanWindowContext_unix.cpp
+@@ -30,7 +30,7 @@ std::unique_ptr<WindowContext> MakeVulkanForXlib(const XlibWindowInfo& info,
+ return nullptr;
+ }
+
+- auto createVkSurface = [&info, instProc](VkInstance instance) -> VkSurfaceKHR {
++ VulkanWindowContext::CreateVkSurfaceFn createVkSurface = [&info, instProc](VkInstance instance) -> VkSurfaceKHR {
+ static PFN_vkCreateXcbSurfaceKHR createXcbSurfaceKHR = nullptr;
+ if (!createXcbSurfaceKHR) {
+ createXcbSurfaceKHR =
+@@ -54,6 +54,9 @@ std::unique_ptr<WindowContext> MakeVulkanForXlib(const XlibWindowInfo& info,
+
+ return surface;
+ };
++ // Allow creating just the shared context, without an associated window.
++ if(info.fWindow == None)
++ createVkSurface = nullptr;
+
+ auto canPresent = [&info, instProc](VkInstance instance, VkPhysicalDevice physDev,
+ uint32_t queueFamilyIndex) {
+@@ -76,7 +79,7 @@ std::unique_ptr<WindowContext> MakeVulkanForXlib(const XlibWindowInfo& info,
+ };
+ std::unique_ptr<WindowContext> ctx(
+ new VulkanWindowContext(displayParams, createVkSurface, canPresent, instProc, devProc));
+- if (!ctx->isValid()) {
++ if (!ctx->isValid() && createVkSurface != nullptr) {
+ return nullptr;
+ }
+ return ctx;
+diff --git a/tools/sk_app/win/VulkanWindowContext_win.cpp b/tools/sk_app/win/VulkanWindowContext_win.cpp
+index 909c96127b..35e063ae28 100644
+--- a/tools/sk_app/win/VulkanWindowContext_win.cpp
++++ b/tools/sk_app/win/VulkanWindowContext_win.cpp
+@@ -30,7 +30,7 @@ std::unique_ptr<WindowContext> MakeVulkanForWin(HWND hwnd, const DisplayParams&
+ return nullptr;
+ }
+
+- auto createVkSurface = [hwnd, instProc] (VkInstance instance) -> VkSurfaceKHR {
++ VulkanWindowContext::CreateVkSurfaceFn createVkSurface = [hwnd, instProc] (VkInstance instance) -> VkSurfaceKHR {
+ static PFN_vkCreateWin32SurfaceKHR createWin32SurfaceKHR = nullptr;
+ if (!createWin32SurfaceKHR) {
+ createWin32SurfaceKHR = (PFN_vkCreateWin32SurfaceKHR)
+@@ -54,6 +54,9 @@ std::unique_ptr<WindowContext> MakeVulkanForWin(HWND hwnd, const DisplayParams&
+
+ return surface;
+ };
++ // Allow creating just the shared context, without an associated window.
++ if(hwnd == nullptr)
++ createVkSurface = nullptr;
+
+ auto canPresent = [instProc] (VkInstance instance, VkPhysicalDevice physDev,
+ uint32_t queueFamilyIndex) {
+@@ -71,7 +74,7 @@ std::unique_ptr<WindowContext> MakeVulkanForWin(HWND hwnd, const DisplayParams&
+
+ std::unique_ptr<WindowContext> ctx(
+ new VulkanWindowContext(params, createVkSurface, canPresent, instProc, devProc));
+- if (!ctx->isValid()) {
++ if (!ctx->isValid() && createVkSurface != nullptr) {
+ return nullptr;
+ }
+ return ctx;