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* Copyright 2010 Google Inc.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
#ifndef GrContext_DEFINED
#define GrContext_DEFINED
#include "SkMatrix.h"
#include "SkPathEffect.h"
#include "SkTypes.h"
#include "../private/GrRecordingContext.h"
#include "GrContextOptions.h"
// We shouldn't need this but currently Android is relying on this being include transitively.
#include "SkUnPreMultiply.h"
class GrAtlasManager;
class GrBackendFormat;
class GrBackendSemaphore;
class GrCaps;
class GrContextPriv;
class GrContextThreadSafeProxy;
class GrFragmentProcessor;
struct GrGLInterface;
class GrGpu;
struct GrMockOptions;
class GrPath;
class GrRenderTargetContext;
class GrResourceCache;
class GrResourceProvider;
class GrSamplerState;
class GrSkSLFPFactoryCache;
class GrSurfaceProxy;
class GrSwizzle;
class GrTextContext;
class GrTextureProxy;
struct GrVkBackendContext;
class SkImage;
class SkSurfaceProps;
class SkTaskGroup;
class SkTraceMemoryDump;
class SK_API GrContext : public GrRecordingContext {
* Creates a GrContext for a backend context. If no GrGLInterface is provided then the result of
* GrGLMakeNativeInterface() is used if it succeeds.
static sk_sp<GrContext> MakeGL(sk_sp<const GrGLInterface>, const GrContextOptions&);
static sk_sp<GrContext> MakeGL(sk_sp<const GrGLInterface>);
static sk_sp<GrContext> MakeGL(const GrContextOptions&);
static sk_sp<GrContext> MakeGL();
static sk_sp<GrContext> MakeVulkan(const GrVkBackendContext&, const GrContextOptions&);
static sk_sp<GrContext> MakeVulkan(const GrVkBackendContext&);
#ifdef SK_METAL
* Makes a GrContext which uses Metal as the backend. The device parameter is an MTLDevice
* and queue is an MTLCommandQueue which should be used by the backend. These objects must
* have a ref on them which can be transferred to Ganesh which will release the ref when the
* GrContext is destroyed.
static sk_sp<GrContext> MakeMetal(void* device, void* queue, const GrContextOptions& options);
static sk_sp<GrContext> MakeMetal(void* device, void* queue);
static sk_sp<GrContext> MakeMock(const GrMockOptions*, const GrContextOptions&);
static sk_sp<GrContext> MakeMock(const GrMockOptions*);
~GrContext() override;
sk_sp<GrContextThreadSafeProxy> threadSafeProxy();
* The GrContext normally assumes that no outsider is setting state
* within the underlying 3D API's context/device/whatever. This call informs
* the context that the state was modified and it should resend. Shouldn't
* be called frequently for good performance.
* The flag bits, state, is dpendent on which backend is used by the
* context, either GL or D3D (possible in future).
void resetContext(uint32_t state = kAll_GrBackendState);
* If the backend is GrBackendApi::kOpenGL, then all texture unit/target combinations for which
* the GrContext has modified the bound texture will have texture id 0 bound. This does not
* flush the GrContext. Calling resetContext() does not change the set that will be bound
* to texture id 0 on the next call to resetGLTextureBindings(). After this is called
* all unit/target combinations are considered to have unmodified bindings until the GrContext
* subsequently modifies them (meaning if this is called twice in a row with no intervening
* GrContext usage then the second call is a no-op.)
void resetGLTextureBindings();
* Abandons all GPU resources and assumes the underlying backend 3D API context is no longer
* usable. Call this if you have lost the associated GPU context, and thus internal texture,
* buffer, etc. references/IDs are now invalid. Calling this ensures that the destructors of the
* GrContext and any of its created resource objects will not make backend 3D API calls. Content
* rendered but not previously flushed may be lost. After this function is called all subsequent
* calls on the GrContext will fail or be no-ops.
* The typical use case for this function is that the underlying 3D context was lost and further
* API calls may crash.
void abandonContext() override;
* Returns true if the context was abandoned.
using GrImageContext::abandoned;
* This is similar to abandonContext() however the underlying 3D context is not yet lost and
* the GrContext will cleanup all allocated resources before returning. After returning it will
* assume that the underlying context may no longer be valid.
* The typical use case for this function is that the client is going to destroy the 3D context
* but can't guarantee that GrContext will be destroyed first (perhaps because it may be ref'ed
* elsewhere by either the client or Skia objects).
virtual void releaseResourcesAndAbandonContext();
// Resource Cache
* Return the current GPU resource cache limits.
* @param maxResources If non-null, returns maximum number of resources that
* can be held in the cache.
* @param maxResourceBytes If non-null, returns maximum number of bytes of
* video memory that can be held in the cache.
void getResourceCacheLimits(int* maxResources, size_t* maxResourceBytes) const;
* Gets the current GPU resource cache usage.
* @param resourceCount If non-null, returns the number of resources that are held in the
* cache.
* @param maxResourceBytes If non-null, returns the total number of bytes of video memory held
* in the cache.
void getResourceCacheUsage(int* resourceCount, size_t* resourceBytes) const;
* Gets the number of bytes in the cache consumed by purgeable (e.g. unlocked) resources.
size_t getResourceCachePurgeableBytes() const;
* Specify the GPU resource cache limits. If the current cache exceeds either
* of these, it will be purged (LRU) to keep the cache within these limits.
* @param maxResources The maximum number of resources that can be held in
* the cache.
* @param maxResourceBytes The maximum number of bytes of video memory
* that can be held in the cache.
void setResourceCacheLimits(int maxResources, size_t maxResourceBytes);
* Frees GPU created by the context. Can be called to reduce GPU memory
* pressure.
virtual void freeGpuResources();
* Purge GPU resources that haven't been used in the past 'msNotUsed' milliseconds or are
* otherwise marked for deletion, regardless of whether the context is under budget.
void performDeferredCleanup(std::chrono::milliseconds msNotUsed);
// Temporary compatibility API for Android.
void purgeResourcesNotUsedInMs(std::chrono::milliseconds msNotUsed) {
* Purge unlocked resources from the cache until the the provided byte count has been reached
* or we have purged all unlocked resources. The default policy is to purge in LRU order, but
* can be overridden to prefer purging scratch resources (in LRU order) prior to purging other
* resource types.
* @param maxBytesToPurge the desired number of bytes to be purged.
* @param preferScratchResources If true scratch resources will be purged prior to other
* resource types.
void purgeUnlockedResources(size_t bytesToPurge, bool preferScratchResources);
* This entry point is intended for instances where an app has been backgrounded or
* suspended.
* If 'scratchResourcesOnly' is true all unlocked scratch resources will be purged but the
* unlocked resources with persistent data will remain. If 'scratchResourcesOnly' is false
* then all unlocked resources will be purged.
* In either case, after the unlocked resources are purged a separate pass will be made to
* ensure that resource usage is under budget (i.e., even if 'scratchResourcesOnly' is true
* some resources with persistent data may be purged to be under budget).
* @param scratchResourcesOnly If true only unlocked scratch resources will be purged prior
* enforcing the budget requirements.
void purgeUnlockedResources(bool scratchResourcesOnly);
* Gets the maximum supported texture size.
int maxTextureSize() const;
* Gets the maximum supported render target size.
int maxRenderTargetSize() const;
* Can a SkImage be created with the given color type.
bool colorTypeSupportedAsImage(SkColorType) const;
* Can a SkSurface be created with the given color type. To check whether MSAA is supported
* use maxSurfaceSampleCountForColorType().
bool colorTypeSupportedAsSurface(SkColorType colorType) const {
return this->maxSurfaceSampleCountForColorType(colorType) > 0;
* Gets the maximum supported sample count for a color type. 1 is returned if only non-MSAA
* rendering is supported for the color type. 0 is returned if rendering to this color type
* is not supported at all.
int maxSurfaceSampleCountForColorType(SkColorType) const;
// Misc.
* Inserts a list of GPU semaphores that the current GPU-backed API must wait on before
* executing any more commands on the GPU. Skia will take ownership of the underlying semaphores
* and delete them once they have been signaled and waited on. If this call returns false, then
* the GPU back-end will not wait on any passed in semaphores, and the client will still own the
* semaphores.
bool wait(int numSemaphores, const GrBackendSemaphore* waitSemaphores);
* Call to ensure all drawing to the context has been issued to the underlying 3D API.
void flush();
* Call to ensure all drawing to the context has been issued to the underlying 3D API. After
* issuing all commands, numSemaphore semaphores will be signaled by the gpu. The client passes
* in an array of numSemaphores GrBackendSemaphores. In general these GrBackendSemaphore's can
* be either initialized or not. If they are initialized, the backend uses the passed in
* semaphore. If it is not initialized, a new semaphore is created and the GrBackendSemaphore
* object is initialized with that semaphore.
* The client will own and be responsible for deleting the underlying semaphores that are stored
* and returned in initialized GrBackendSemaphore objects. The GrBackendSemaphore objects
* themselves can be deleted as soon as this function returns.
* If the backend API is OpenGL only uninitialized GrBackendSemaphores are supported.
* If the backend API is Vulkan either initialized or uninitialized semaphores are supported.
* If uninitialized, the semaphores which are created will be valid for use only with the
* VkDevice with which they were created.
* If this call returns GrSemaphoresSubmitted::kNo, the GPU backend will not have created or
* added any semaphores to signal on the GPU. Thus the client should not have the GPU wait on
* any of the semaphores. However, any pending commands to the context will still be flushed.
* If a finishedProc is provided, the finishedProc will be called when all work submitted to the
* gpu from this flush call and all previous flush calls has finished on the GPU. If the flush
* call fails due to an error and nothing ends up getting sent to the GPU, the finished proc is
* called immediately.
GrSemaphoresSubmitted flush(GrFlushFlags flags, int numSemaphores,
GrBackendSemaphore signalSemaphores[],
GrGpuFinishedProc finishedProc = nullptr,
GrGpuFinishedContext finishedContext = nullptr);
* Deprecated.
GrSemaphoresSubmitted flushAndSignalSemaphores(int numSemaphores,
GrBackendSemaphore signalSemaphores[]) {
return this->flush(kNone_GrFlushFlags, numSemaphores, signalSemaphores);
// Provides access to functions that aren't part of the public API.
GrContextPriv priv();
const GrContextPriv priv() const;
/** Enumerates all cached GPU resources and dumps their memory to traceMemoryDump. */
// Chrome is using this!
void dumpMemoryStatistics(SkTraceMemoryDump* traceMemoryDump) const;
bool supportsDistanceFieldText() const;
void storeVkPipelineCacheData();
GrContext(GrBackendApi, const GrContextOptions&, int32_t contextID = SK_InvalidGenID);
bool init(sk_sp<const GrCaps>, sk_sp<GrSkSLFPFactoryCache>) override;
GrContext* asDirectContext() override { return this; }
virtual GrAtlasManager* onGetAtlasManager() = 0;
sk_sp<GrContextThreadSafeProxy> fThreadSafeProxy;
// fTaskGroup must appear before anything that uses it (e.g. fGpu), so that it is destroyed
// after all of its users. Clients of fTaskGroup will generally want to ensure that they call
// wait() on it as they are being destroyed, to avoid the possibility of pending tasks being
// invoked after objects they depend upon have already been destroyed.
std::unique_ptr<SkTaskGroup> fTaskGroup;
sk_sp<GrGpu> fGpu;
GrResourceCache* fResourceCache;
GrResourceProvider* fResourceProvider;
bool fDidTestPMConversions;
// true if the PM/UPM conversion succeeded; false otherwise
bool fPMUPMConversionsRoundTrip;
GrContextOptions::PersistentCache* fPersistentCache;
// TODO: have the GrClipStackClip use renderTargetContexts and rm this friending
friend class GrContextPriv;
* These functions create premul <-> unpremul effects, using the specialized round-trip effects
* from GrConfigConversionEffect.
std::unique_ptr<GrFragmentProcessor> createPMToUPMEffect(std::unique_ptr<GrFragmentProcessor>);
std::unique_ptr<GrFragmentProcessor> createUPMToPMEffect(std::unique_ptr<GrFragmentProcessor>);
* Returns true if createPMToUPMEffect and createUPMToPMEffect will succeed. In other words,
* did we find a pair of round-trip preserving conversion effects?
bool validPMUPMConversionExists();
typedef GrRecordingContext INHERITED;