- merged gzdoom-gles2 and fixed some issues with pipeline size validation.

src/common/rendering/gl/gl_buffers.cpp

@@ -170,6 +170,29 @@ void GLBuffer::Resize(size_t newsize)
 	}
 }
 
+void GLBuffer::GPUDropSync()
+{
+	if (mGLSync != NULL)
+	{
+		glDeleteSync(mGLSync);
+	}
+
+	mGLSync = glFenceSync(GL_SYNC_GPU_COMMANDS_COMPLETE, 0);
+}
+
+void GLBuffer::GPUWaitSync()
+{
+	GLenum status = glClientWaitSync(mGLSync, GL_SYNC_FLUSH_COMMANDS_BIT, 1000 * 1000 * 50); // Wait for a max of 50ms...
+	
+	if (status != GL_ALREADY_SIGNALED && status != GL_CONDITION_SATISFIED)
+	{
+		//Printf("Error on glClientWaitSync: %d\n", status);
+	}
+	
+	glDeleteSync(mGLSync);
+
+	mGLSync = NULL;
+}
 
 //===========================================================================
 //