Add API for flushing surfaces with gpu semaphores

BUG=skia:

Change-Id: Ia4bfef784cd5f2516ceccafce958be18a86f91d1
Reviewed-on: https://skia-review.googlesource.com/11488
Commit-Queue: Greg Daniel <egdaniel@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
Reviewed-by: Forrest Reiling <freiling@google.com>

3 files changed, 33 insertions, 9 deletions

diff --git a/src/gpu/gl/GrGLGpu.cpp b/src/gpu/gl/GrGLGpu.cpp
index b3f8c2caa8..d40160044c 100644
--- a/src/gpu/gl/GrGLGpu.cpp
+++ b/src/gpu/gl/GrGLGpu.cpp
@@ -9,6 +9,7 @@
 
 #include <cmath>
 #include "../private/GrGLSL.h"
+#include "GrBackendSemaphore.h"
 #include "GrBackendSurface.h"
 #include "GrFixedClip.h"
 #include "GrGLBuffer.h"
@@ -4288,10 +4289,16 @@ void GrGLGpu::deleteFence(GrFence fence) const {
     this->deleteSync((GrGLsync)fence);
 }
 
-sk_sp<GrSemaphore> SK_WARN_UNUSED_RESULT GrGLGpu::makeSemaphore() {
-    return GrGLSemaphore::Make(this);
+sk_sp<GrSemaphore> SK_WARN_UNUSED_RESULT GrGLGpu::makeSemaphore(bool isOwned) {
+    return GrGLSemaphore::Make(this, isOwned);
 }
 
+sk_sp<GrSemaphore> GrGLGpu::wrapBackendSemaphore(const GrBackendSemaphore& semaphore,
+                                                 GrWrapOwnership ownership) {
+    return GrGLSemaphore::MakeWrapped(this, semaphore.glSync(), ownership);
+}
+
+
 void GrGLGpu::insertSemaphore(sk_sp<GrSemaphore> semaphore, bool flush) {
     GrGLSemaphore* glSem = static_cast<GrGLSemaphore*>(semaphore.get());
 
@@ -4316,7 +4323,7 @@ void GrGLGpu::deleteSync(GrGLsync sync) const {
 
 sk_sp<GrSemaphore> GrGLGpu::prepareTextureForCrossContextUsage(GrTexture* texture) {
     // Set up a semaphore to be signaled once the data is ready, and flush GL
-    sk_sp<GrSemaphore> semaphore = this->makeSemaphore();
+    sk_sp<GrSemaphore> semaphore = this->makeSemaphore(true);
     this->insertSemaphore(semaphore, true);
 
     return semaphore;
diff --git a/src/gpu/gl/GrGLGpu.h b/src/gpu/gl/GrGLGpu.h
index f121df3f01..80a12eb7cc 100644
--- a/src/gpu/gl/GrGLGpu.h
+++ b/src/gpu/gl/GrGLGpu.h
@@ -166,7 +166,9 @@ public:
     bool waitFence(GrFence, uint64_t timeout) override;
     void deleteFence(GrFence) const override;
 
-    sk_sp<GrSemaphore> SK_WARN_UNUSED_RESULT makeSemaphore() override;
+    sk_sp<GrSemaphore> SK_WARN_UNUSED_RESULT makeSemaphore(bool isOwned) override;
+    sk_sp<GrSemaphore> wrapBackendSemaphore(const GrBackendSemaphore& semaphore,
+                                            GrWrapOwnership ownership) override;
     void insertSemaphore(sk_sp<GrSemaphore> semaphore, bool flush) override;
     void waitSemaphore(sk_sp<GrSemaphore> semaphore) override;
 
diff --git a/src/gpu/gl/GrGLSemaphore.h b/src/gpu/gl/GrGLSemaphore.h
index f439ebd294..cfc3de9951 100644
--- a/src/gpu/gl/GrGLSemaphore.h
+++ b/src/gpu/gl/GrGLSemaphore.h
@@ -10,16 +10,26 @@
 
 #include "GrSemaphore.h"
 
-class GrGLGpu;
+#include "GrBackendSemaphore.h"
+#include "GrGLGpu.h"
 
 class GrGLSemaphore : public GrSemaphore {
 public:
-    static sk_sp<GrGLSemaphore> Make(const GrGLGpu* gpu) {
-        return sk_sp<GrGLSemaphore>(new GrGLSemaphore(gpu));
+    static sk_sp<GrGLSemaphore> Make(const GrGLGpu* gpu, bool isOwned) {
+        return sk_sp<GrGLSemaphore>(new GrGLSemaphore(gpu, isOwned));
+    }
+
+    static sk_sp<GrGLSemaphore> MakeWrapped(const GrGLGpu* gpu,
+                                            GrGLsync sync,
+                                            GrWrapOwnership ownership) {
+        auto sema = sk_sp<GrGLSemaphore>(new GrGLSemaphore(gpu,
+                                                           kBorrow_GrWrapOwnership != ownership));
+        sema->setSync(sync);
+        return sema;
     }
 
     ~GrGLSemaphore() override {
-        if (fGpu) {
+        if (fIsOwned && fGpu) {
             static_cast<const GrGLGpu*>(fGpu)->deleteSync(fSync);
         }
     }
@@ -28,9 +38,14 @@ public:
     void setSync(const GrGLsync& sync) { fSync = sync; }
 
 private:
-    GrGLSemaphore(const GrGLGpu* gpu) : INHERITED(gpu), fSync(0) {}
+    GrGLSemaphore(const GrGLGpu* gpu, bool isOwned) : INHERITED(gpu), fSync(0), fIsOwned(isOwned) {}
+
+    void setBackendSemaphore(GrBackendSemaphore* backendSemaphore) const override {
+        backendSemaphore->initGL(fSync);
+    }
 
     GrGLsync fSync;
+    bool     fIsOwned;
 
     typedef GrSemaphore INHERITED;
 };