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, 14 insertions, 0 deletions

diff --git a/source/blender/gpu/intern/gpu_context.cc b/source/blender/gpu/intern/gpu_context.cc
index f6b88c4231c..7e94538892a 100644
--- a/source/blender/gpu/intern/gpu_context.cc
+++ b/source/blender/gpu/intern/gpu_context.cc
@@ -33,6 +33,9 @@
 #  include "gl_backend.hh"
 #  include "gl_context.hh"
 #endif
+#ifdef WITH_VULKAN_BACKEND
+#  include "vk_backend.hh"
+#endif
 #ifdef WITH_METAL_BACKEND
 #  include "mtl_backend.hh"
 #endif
@@ -245,6 +248,12 @@ bool GPU_backend_supported(void)
 #else
       return false;
 #endif
+    case GPU_BACKEND_VULKAN:
+#ifdef WITH_VULKAN_BACKEND
+      return true;
+#else
+      return false;
+#endif
     case GPU_BACKEND_METAL:
 #ifdef WITH_METAL_BACKEND
       return MTLBackend::metal_is_supported();
@@ -268,6 +277,11 @@ static void gpu_backend_create()
       g_backend = new GLBackend;
       break;
 #endif
+#ifdef WITH_VULKAN_BACKEND
+    case GPU_BACKEND_VULKAN:
+      g_backend = new VKBackend;
+      break;
+#endif
 #ifdef WITH_METAL_BACKEND
     case GPU_BACKEND_METAL:
       g_backend = new MTLBackend;