From 85985c4408906b18eb451ca94edabaa0c3607817 Mon Sep 17 00:00:00 2001
From: Steven Le Rouzic <steven.lerouzic@gmail.com>
Date: Mon, 22 Apr 2024 00:17:53 +0200
Subject: Add Vulkan loader

---
 deimos/vulkan/BUILD                      | 15 ++++++++
 deimos/vulkan/vulkan.h                   | 33 +++++++++++++++++
 deimos/vulkan/vulkan_entry_functions.inc |  2 ++
 deimos/vulkan/vulkan_loader.cpp          | 61 ++++++++++++++++++++++++++++++++
 4 files changed, 111 insertions(+)
 create mode 100644 deimos/vulkan/BUILD
 create mode 100644 deimos/vulkan/vulkan.h
 create mode 100644 deimos/vulkan/vulkan_entry_functions.inc
 create mode 100644 deimos/vulkan/vulkan_loader.cpp

(limited to 'deimos/vulkan')

diff --git a/deimos/vulkan/BUILD b/deimos/vulkan/BUILD
new file mode 100644
index 0000000..a773fa1
--- /dev/null
+++ b/deimos/vulkan/BUILD
@@ -0,0 +1,15 @@
+cc_library(
+    name = "vulkan",
+    hdrs = [
+        "vulkan.h",
+    ],
+    srcs = [
+        "vulkan_loader.cpp",
+        "vulkan_entry_functions.inc",
+    ],
+    deps = [
+        "//deimos/core",
+        "//3rd_party/vulkan",
+    ],
+    visibility = ["//:__subpackages__"],
+)
diff --git a/deimos/vulkan/vulkan.h b/deimos/vulkan/vulkan.h
new file mode 100644
index 0000000..549deac
--- /dev/null
+++ b/deimos/vulkan/vulkan.h
@@ -0,0 +1,33 @@
+#pragma once
+
+#include <deimos/core/id_name.h>
+#include <vulkan.h>
+
+namespace deimos
+{
+
+class ApiRegistry;
+
+struct VulkanApi
+{
+#define FN(NAME) PFN_vk##NAME NAME{};
+#include "deimos/vulkan/vulkan_entry_functions.inc"
+#undef FN
+};
+
+class VulkanLoaderApi
+{
+public:
+    VulkanLoaderApi() = default;
+    deimos_NO_COPY_MOVE(VulkanLoaderApi);
+    virtual ~VulkanLoaderApi() = default;
+
+    static constexpr IdName kApiName{"deimos::VulkanLoaderApi"};
+
+    virtual VulkanApi* LoadEntry() = 0;
+};
+
+void RegisterVulkanLoaderApi(ApiRegistry*);
+
+} // namespace deimos
+
diff --git a/deimos/vulkan/vulkan_entry_functions.inc b/deimos/vulkan/vulkan_entry_functions.inc
new file mode 100644
index 0000000..97584c4
--- /dev/null
+++ b/deimos/vulkan/vulkan_entry_functions.inc
@@ -0,0 +1,2 @@
+FN(GetInstanceProcAddr)
+FN(CreateInstance)
diff --git a/deimos/vulkan/vulkan_loader.cpp b/deimos/vulkan/vulkan_loader.cpp
new file mode 100644
index 0000000..ddd5cf0
--- /dev/null
+++ b/deimos/vulkan/vulkan_loader.cpp
@@ -0,0 +1,61 @@
+#include "deimos/vulkan/vulkan.h"
+
+#include <deimos/core/api_registry.h>
+#include <deimos/core/allocator.h>
+#include <deimos/core/os.h>
+#include <deimos/core/log.h>
+
+static deimos::OsApi* os_api;
+static deimos::LogApi* log_api;
+
+namespace deimos
+{
+
+class VulkanLoaderImpl : public VulkanLoaderApi
+{
+    Allocator*            m_allocator;
+    gsl::owner<OsDll*>    m_vulkan_dll{};
+    
+public:
+    explicit VulkanLoaderImpl(Allocator* allocator) : m_allocator{allocator} {}
+    
+    VulkanApi* LoadEntry() override
+    {
+        if (m_vulkan_dll == nullptr)
+        {
+            m_vulkan_dll = os_api->dll->Open("vulkan-1.dll");
+            if (m_vulkan_dll != nullptr)
+            {
+                log_api->LogInfo("Vulkan DLL loaded");
+            }
+            else
+            {
+                deimos_Panic("Couldn't load Vulkan DLL");
+                return nullptr;
+            }
+        }
+
+        VulkanApi* api = m_allocator->New<VulkanApi>();
+#define FN(NAME) api->NAME = (PFN_vk##NAME)os_api->dll->GetSymbol(m_vulkan_dll, "vk" #NAME);
+#include "deimos/vulkan/vulkan_entry_functions.inc"
+#undef FN
+        return api;
+    }
+};
+
+void RegisterVulkanLoaderApi(ApiRegistry* registry)
+{
+    os_api = registry->Get<OsApi>();
+    log_api = registry->Get<LogApi>();
+
+    auto* allocator_api = registry->Get<AllocatorApi>();
+    auto* allocator = allocator_api->CreateChild(allocator_api->system, "Vulkan");
+
+    auto* impl = allocator->New<VulkanLoaderImpl>(allocator);
+    registry->Set(impl);
+    
+    log_api->LogInfo("Vulkan loader API registered");
+}
+
+} // namespace deimos
+
-- 
cgit