libgui: have ST::updateTexImage check the GL ctx

This change adds a check to SurfaceTexture::updateTexImage to verify
that the current GL context is the same as the one that was used for
previous updateTexImage calls.

Change-Id: If02d2f787bcfdb528046dc9ddf6665f8a90e1bf4

1 files changed, 11 insertions, 4 deletions

diff --git a/include/gui/SurfaceTexture.h b/include/gui/SurfaceTexture.h
index f8dc3ac..cd490f2 100644
--- a/include/gui/SurfaceTexture.h
+++ b/include/gui/SurfaceTexture.h
@@ -260,7 +260,6 @@ private:
     struct EGLSlot {
         EGLSlot()
         : mEglImage(EGL_NO_IMAGE_KHR),
-          mEglDisplay(EGL_NO_DISPLAY),
           mFence(EGL_NO_SYNC_KHR) {
         }
 
@@ -269,9 +268,6 @@ private:
         // mEglImage is the EGLImage created from mGraphicBuffer.
         EGLImageKHR mEglImage;
 
-        // mEglDisplay is the EGLDisplay used to create mEglImage.
-        EGLDisplay mEglDisplay;
-
         // mFence is the EGL sync object that must signal before the buffer
         // associated with this buffer slot may be dequeued. It is initialized
         // to EGL_NO_SYNC_KHR when the buffer is created and (optionally, based
@@ -279,6 +275,17 @@ private:
         EGLSyncKHR mFence;
     };
 
+    // mEglDisplay is the EGLDisplay with which this SurfaceTexture is currently
+    // associated.  It is intialized to EGL_NO_DISPLAY and gets set to the
+    // current display when updateTexImage is called for the first time.
+    EGLDisplay mEglDisplay;
+
+    // mEglContext is the OpenGL ES context with which this SurfaceTexture is
+    // currently associated.  It is initialized to EGL_NO_CONTEXT and gets set
+    // to the current GL context when updateTexImage is called for the first
+    // time.
+    EGLContext mEglContext;
+
     // mEGLSlots stores the buffers that have been allocated by the BufferQueue
     // for each buffer slot.  It is initialized to null pointers, and gets
     // filled in with the result of BufferQueue::acquire when the