From 29292ac6d0e59728ea7fae577c145a9b6dddce16 Mon Sep 17 00:00:00 2001
From: Jesse Hall <jessehall@google.com>
Date: Mon, 21 May 2012 11:23:57 -0700
Subject: Implement the EGL_KHR_fence_sync extension

Bug: 6515813
Change-Id: I738fc2663d81876dc75ad560fd08506b423a21bf
---
 emulator/opengl/system/egl/egl.cpp        | 75 ++++++++++++++++++++++++-------
 emulator/opengl/system/egl/eglDisplay.cpp |  3 +-
 emulator/opengl/system/egl/egl_ftable.h   |  1 -
 3 files changed, 61 insertions(+), 18 deletions(-)

diff --git a/emulator/opengl/system/egl/egl.cpp b/emulator/opengl/system/egl/egl.cpp
index 5aa5bda..ee195ac 100644
--- a/emulator/opengl/system/egl/egl.cpp
+++ b/emulator/opengl/system/egl/egl.cpp
@@ -13,6 +13,7 @@
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
+
 #include "HostConnection.h"
 #include "ThreadInfo.h"
 #include "eglDisplay.h"
@@ -1180,32 +1181,74 @@ EGLBoolean eglDestroyImageKHR(EGLDisplay dpy, EGLImageKHR img)
     return EGL_TRUE;
 }
 
-EGLSyncKHR eglCreateSyncKHR(EGLDisplay dpy, EGLenum type, const EGLint *attrib_list)
+#define FENCE_SYNC_HANDLE (EGLSyncKHR)0xFE4CE
+
+EGLSyncKHR eglCreateSyncKHR(EGLDisplay dpy, EGLenum type,
+        const EGLint *attrib_list)
 {
-    //TODO later
-    return 0;
+    // TODO: This implementation could be faster. We should require the host EGL
+    // to support KHR_fence_sync, or at least pipe the fence command to the host
+    // and wait for it (probably involving a glFinish on the host) in
+    // eglClientWaitSyncKHR.
+
+    VALIDATE_DISPLAY(dpy, EGL_NO_SYNC_KHR);
+
+    if (type != EGL_SYNC_FENCE_KHR ||
+            (attrib_list != NULL && attrib_list[0] != EGL_NONE)) {
+        setErrorReturn(EGL_BAD_ATTRIBUTE, EGL_NO_SYNC_KHR);
+    }
+
+    EGLThreadInfo *tInfo = getEGLThreadInfo();
+    if (!tInfo || !tInfo->currentContext) {
+        setErrorReturn(EGL_BAD_MATCH, EGL_NO_SYNC_KHR);
+    }
+
+    if (tInfo->currentContext->version == 2) {
+        s_display.gles2_iface()->finish();
+    } else {
+        s_display.gles_iface()->finish();
+    }
+
+    return FENCE_SYNC_HANDLE;
 }
 
 EGLBoolean eglDestroySyncKHR(EGLDisplay dpy, EGLSyncKHR sync)
 {
-    //TODO later
-    return 0;
-}
+    if (sync != FENCE_SYNC_HANDLE) {
+        setErrorReturn(EGL_BAD_PARAMETER, EGL_FALSE);
+    }
 
-EGLint eglClientWaitSyncKHR(EGLDisplay dpy, EGLSyncKHR sync, EGLint flags, EGLTimeKHR timeout)
-{
-    //TODO
-    return 0;
+    return EGL_TRUE;
 }
 
-EGLBoolean eglSignalSyncKHR(EGLDisplay dpy, EGLSyncKHR sync, EGLenum mode)
+EGLint eglClientWaitSyncKHR(EGLDisplay dpy, EGLSyncKHR sync, EGLint flags,
+        EGLTimeKHR timeout)
 {
-    //TODO later
-    return 0;
+    if (sync != FENCE_SYNC_HANDLE) {
+        setErrorReturn(EGL_BAD_PARAMETER, EGL_FALSE);
+    }
+
+    return EGL_CONDITION_SATISFIED_KHR;
 }
 
-EGLBoolean eglGetSyncAttribKHR(EGLDisplay dpy, EGLSyncKHR sync, EGLint attribute, EGLint *value)
+EGLBoolean eglGetSyncAttribKHR(EGLDisplay dpy, EGLSyncKHR sync,
+        EGLint attribute, EGLint *value)
 {
-    //TODO later
-    return 0;
+    if (sync != FENCE_SYNC_HANDLE) {
+        setErrorReturn(EGL_BAD_PARAMETER, EGL_FALSE);
+    }
+
+    switch (attribute) {
+    case EGL_SYNC_TYPE_KHR:
+        *value = EGL_SYNC_FENCE_KHR;
+        return EGL_TRUE;
+    case EGL_SYNC_STATUS_KHR:
+        *value = EGL_SIGNALED_KHR;
+        return EGL_TRUE;
+    case EGL_SYNC_CONDITION_KHR:
+        *value = EGL_SYNC_PRIOR_COMMANDS_COMPLETE_KHR;
+        return EGL_TRUE;
+    default:
+        setErrorReturn(EGL_BAD_ATTRIBUTE, EGL_FALSE);
+    }
 }
diff --git a/emulator/opengl/system/egl/eglDisplay.cpp b/emulator/opengl/system/egl/eglDisplay.cpp
index 2497548..bcb0d4b 100644
--- a/emulator/opengl/system/egl/eglDisplay.cpp
+++ b/emulator/opengl/system/egl/eglDisplay.cpp
@@ -24,7 +24,8 @@ static const char systemEGLVendor[] = "Google Android emulator";
 // list of extensions supported by this EGL implementation
 //  NOTE that each extension name should be suffixed with space
 static const char systemStaticEGLExtensions[] =
-            "EGL_ANDROID_image_native_buffer ";
+            "EGL_ANDROID_image_native_buffer "
+            "EGL_KHR_fence_sync ";
 
 // list of extensions supported by this EGL implementation only if supported
 // on the host implementation.
diff --git a/emulator/opengl/system/egl/egl_ftable.h b/emulator/opengl/system/egl/egl_ftable.h
index b21da72..16d130c 100644
--- a/emulator/opengl/system/egl/egl_ftable.h
+++ b/emulator/opengl/system/egl/egl_ftable.h
@@ -58,7 +58,6 @@ static const struct _egl_funcs_by_name {
     {"eglCreateSyncKHR", (void *)eglCreateSyncKHR},
     {"eglDestroySyncKHR", (void *)eglDestroySyncKHR},
     {"eglClientWaitSyncKHR", (void *)eglClientWaitSyncKHR},
-    {"eglSignalSyncKHR", (void *)eglSignalSyncKHR},
     {"eglGetSyncAttribKHR", (void *)eglGetSyncAttribKHR}
 };
 
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