[gtk+] gsk: Fix Vulkan validation errors for image upload

[Matthias Clasen <matthiasc src gnome org>]

commit 145e4fde92182b89c278e20cc0dc66ac820a8ea4
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Sep 26 18:18:31 2017 -0400

    gsk: Fix Vulkan validation errors for image upload
    
    I've finally figured out the right combination of src and dest
    stage and access flags to make all validation warnings go away.
    This commit only fixes the direct upload code.

 gsk/gskvulkanimage.c |   16 ++++------------
 1 files changed, 4 insertions(+), 12 deletions(-)
---
diff --git a/gsk/gskvulkanimage.c b/gsk/gskvulkanimage.c
index d09a109..1eb9c3a 100644
--- a/gsk/gskvulkanimage.c
+++ b/gsk/gskvulkanimage.c
@@ -148,12 +148,8 @@ gsk_vulkan_uploader_upload (GskVulkanUploader *self)
 
       command_buffer = gsk_vulkan_command_pool_get_buffer (self->command_pool);
       vkCmdPipelineBarrier (command_buffer,
-#if 0
-                            VK_PIPELINE_STAGE_TOP_OF_PIPE_BIT,
-                            VK_PIPELINE_STAGE_TOP_OF_PIPE_BIT,
-#endif
-                            VK_PIPELINE_STAGE_TRANSFER_BIT,
-                            VK_PIPELINE_STAGE_TRANSFER_BIT,
+                            VK_PIPELINE_STAGE_FRAGMENT_SHADER_BIT,
+                            VK_PIPELINE_STAGE_HOST_BIT | VK_PIPELINE_STAGE_TRANSFER_BIT,
                             0,
                             0, NULL,
                             self->before_buffer_barriers->len, (VkBufferMemoryBarrier *) 
self->before_buffer_barriers->data,
@@ -168,12 +164,8 @@ gsk_vulkan_uploader_upload (GskVulkanUploader *self)
     {
       VkCommandBuffer command_buffer = gsk_vulkan_uploader_get_copy_buffer (self);
       vkCmdPipelineBarrier (command_buffer,
-#if 0
-                            VK_PIPELINE_STAGE_TOP_OF_PIPE_BIT,
-                            VK_PIPELINE_STAGE_TOP_OF_PIPE_BIT,
-#endif
-                            VK_PIPELINE_STAGE_VERTEX_SHADER_BIT,
-                            VK_PIPELINE_STAGE_VERTEX_SHADER_BIT,
+                            VK_PIPELINE_STAGE_HOST_BIT | VK_PIPELINE_STAGE_TRANSFER_BIT,
+                            VK_PIPELINE_STAGE_FRAGMENT_SHADER_BIT,
                             0,
                             0, NULL,
                             self->after_buffer_barriers->len, (VkBufferMemoryBarrier *) 
self->after_buffer_barriers->data,