GPU: Add placeholder for Vulkan backend.

This patch adds a placeholder for the vulkan backend.
When activated (`WITH_VULKAN_BACKEND=On` and `--gpu-backend vulkan`)
it might open a blender screen, but nothing should be visible as
none of the functions are implemented or otherwise crash on a nullptr.

This is expected as this is just a placeholder. The goal is to add shader compilation
+validation to this backend as one of the next steps so we can validate
changes to existing shaders on OpenGL, Metal and Vulkan at the same time.

Reviewed By: fclem

Differential Revision: https://developer.blender.org/D16338

1 files changed, 28 insertions, 0 deletions

diff --git a/source/blender/gpu/vulkan/vk_query.cc b/source/blender/gpu/vulkan/vk_query.cc
new file mode 100644
index 00000000000..e24fe54e5d0
--- /dev/null
+++ b/source/blender/gpu/vulkan/vk_query.cc
@@ -0,0 +1,28 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later
+ * Copyright 2022 Blender Foundation. All rights reserved. */
+
+/** \file
+ * \ingroup gpu
+ */
+
+#include "vk_query.hh"
+
+namespace blender::gpu {
+
+void VKQueryPool::init(GPUQueryType /*type*/)
+{
+}
+
+void VKQueryPool::begin_query()
+{
+}
+
+void VKQueryPool::end_query()
+{
+}
+
+void VKQueryPool::get_occlusion_result(MutableSpan<uint32_t> /*r_values*/)
+{
+}
+
+}  // namespace blender::gpu
\ No newline at end of file