1 files changed, 114 insertions, 0 deletions
diff --git a/gfx/gl/EGLUtils.cpp b/gfx/gl/EGLUtils.cpp
new file mode 100644
index 000000000..bc55d7fb0
--- /dev/null
+++ b/gfx/gl/EGLUtils.cpp
@@ -0,0 +1,114 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "EGLUtils.h"
+
+#include "GLContextEGL.h"
+
+namespace mozilla {
+namespace gl {
+
+bool
+DoesEGLContextSupportSharingWithEGLImage(GLContext* gl)
+{
+    return sEGLLibrary.HasKHRImageBase() &&
+           sEGLLibrary.HasKHRImageTexture2D() &&
+           gl->IsExtensionSupported(GLContext::OES_EGL_image);
+}
+
+EGLImage
+CreateEGLImage(GLContext* gl, GLuint tex)
+{
+    MOZ_ASSERT(DoesEGLContextSupportSharingWithEGLImage(gl));
+
+    EGLClientBuffer clientBuffer = (EGLClientBuffer)((uint64_t)tex);
+    EGLContext eglContext = GLContextEGL::Cast(gl)->mContext;
+    EGLImage image = sEGLLibrary.fCreateImage(EGL_DISPLAY(),
+                                              eglContext,
+                                              LOCAL_EGL_GL_TEXTURE_2D,
+                                              clientBuffer,
+                                              nullptr);
+    return image;
+}
+
+////////////////////////////////////////////////////////////////////////
+// EGLImageWrapper
+
+/*static*/ EGLImageWrapper*
+EGLImageWrapper::Create(GLContext* gl, GLuint tex)
+{
+    MOZ_ASSERT(DoesEGLContextSupportSharingWithEGLImage(gl));
+
+    GLLibraryEGL& library = sEGLLibrary;
+    EGLDisplay display = EGL_DISPLAY();
+    EGLContext eglContext = GLContextEGL::Cast(gl)->mContext;
+    EGLClientBuffer clientBuffer = (EGLClientBuffer)((uint64_t)tex);
+    EGLImage image = library.fCreateImage(display,
+                                          eglContext,
+                                          LOCAL_EGL_GL_TEXTURE_2D,
+                                          clientBuffer,
+                                          nullptr);
+    if (!image) {
+#ifdef DEBUG
+        printf_stderr("Could not create EGL images: ERROR (0x%04x)\n",
+                      sEGLLibrary.fGetError());
+#endif
+        return nullptr;
+    }
+
+    return new EGLImageWrapper(library, display, image);
+}
+
+EGLImageWrapper::~EGLImageWrapper()
+{
+    mLibrary.fDestroyImage(mDisplay, mImage);
+}
+
+bool
+EGLImageWrapper::FenceSync(GLContext* gl)
+{
+    MOZ_ASSERT(!mSync);
+
+    if (mLibrary.IsExtensionSupported(GLLibraryEGL::KHR_fence_sync)) {
+        mSync = mLibrary.fCreateSync(mDisplay,
+                                     LOCAL_EGL_SYNC_FENCE,
+                                     nullptr);
+        // We need to flush to make sure the sync object enters the command stream;
+        // we can't use EGL_SYNC_FLUSH_COMMANDS_BIT at wait time, because the wait
+        // happens on a different thread/context.
+        gl->fFlush();
+    }
+
+    if (!mSync) {
+        // we failed to create one, so just do a finish
+        gl->fFinish();
+    }
+
+    return true;
+}
+
+bool
+EGLImageWrapper::ClientWaitSync()
+{
+    if (!mSync) {
+        // if we have no sync object, then we did a Finish() earlier
+        return true;
+    }
+
+    // wait at most 1 second; this should really be never/rarely hit
+    const uint64_t ns_per_ms = 1000 * 1000;
+    EGLTime timeout = 1000 * ns_per_ms;
+
+    EGLint result = mLibrary.fClientWaitSync(mDisplay,
+                                             mSync,
+                                             0,
+                                             timeout);
+    mLibrary.fDestroySync(mDisplay, mSync);
+    mSync = nullptr;
+
+    return result == LOCAL_EGL_CONDITION_SATISFIED;
+}
+
+} // namespace gl
+} // namespace mozilla