wined3d: Implement NULL constant buffer views for the Vulkan backend.

dlls/wined3d/context_vk.c

@@ -2527,8 +2527,11 @@ static bool wined3d_context_vk_update_descriptors(struct wined3d_context_vk *con
             case WINED3D_SHADER_DESCRIPTOR_TYPE_CBV:
                 if (!(buffer = state->cb[binding->shader_type][binding->resource_idx]))
                 {
-                    FIXME("NULL constant buffer views not implemented.\n");
+                    if (!wined3d_shader_descriptor_writes_vk_add_write(writes, vk_descriptor_set,
+                            binding->binding_idx, VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER,
+                            &device_vk->null_resources_vk.buffer_info, NULL, NULL))
                         return false;
+                    break;
                 }
                 buffer_vk = wined3d_buffer_vk(buffer);
                 buffer_info = wined3d_buffer_vk_get_buffer_info(buffer_vk);

dlls/wined3d/device.c

@@ -717,11 +717,15 @@ bool wined3d_device_vk_create_null_resources(struct wined3d_device_vk *device_vk
 
     vk_info = context_vk->vk_info;
 
-    usage = VK_BUFFER_USAGE_TRANSFER_DST_BIT | VK_BUFFER_USAGE_UNIFORM_TEXEL_BUFFER_BIT;
+    usage = VK_BUFFER_USAGE_TRANSFER_DST_BIT | VK_BUFFER_USAGE_UNIFORM_TEXEL_BUFFER_BIT
+            | VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT;
     memory_type = VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT;
     if (!wined3d_context_vk_create_bo(context_vk, 16, usage, memory_type, &r->bo))
         return false;
     VK_CALL(vkCmdFillBuffer(vk_command_buffer, r->bo.vk_buffer, r->bo.buffer_offset, r->bo.size, 0x00000000u));
+    r->buffer_info.buffer = r->bo.vk_buffer;
+    r->buffer_info.offset = r->bo.buffer_offset;
+    r->buffer_info.range = r->bo.size;
 
     if (!wined3d_null_image_vk_init(&r->image_1d, context_vk, vk_command_buffer, VK_IMAGE_TYPE_1D, 1, 1))
     {

dlls/wined3d/wined3d_private.h

@@ -3875,6 +3875,8 @@ struct wined3d_null_image_vk
 struct wined3d_null_resources_vk
 {
     struct wined3d_bo_vk bo;
+    VkDescriptorBufferInfo buffer_info;
+
     struct wined3d_null_image_vk image_1d;
     struct wined3d_null_image_vk image_2d;
     struct wined3d_null_image_vk image_2dms;