From e321beb543311dcb591942ec42464e38cbeae0f0 Mon Sep 17 00:00:00 2001
From: hachem <im@hachem.wtf>
Date: Tue, 22 Sep 2026 06:40:02 +0200
Subject: fix: Vulkan backend on Windows

---
 src/platform/vulkan/vulkan_device.cpp | 36 ++++++++++++++++++++++++++++++++++-
 1 file changed, 35 insertions(+), 1 deletion(-)

(limited to 'src/platform/vulkan/vulkan_device.cpp')

diff --git a/src/platform/vulkan/vulkan_device.cpp b/src/platform/vulkan/vulkan_device.cpp
index b4c2630..f5d7662 100644
--- a/src/platform/vulkan/vulkan_device.cpp
+++ b/src/platform/vulkan/vulkan_device.cpp
@@ -1,5 +1,15 @@
 #include "vulkan_common.h"
 
+#include <algorithm>
+#include <filesystem>
+
+#if defined(_WIN32)
+    #ifndef NOMINMAX
+        #define NOMINMAX
+    #endif
+    #include <windows.h>
+#endif
+
 #include <imgui.h>
 #include <imgui_impl_glfw.h>
 #include <imgui_impl_vulkan.h>
@@ -44,7 +54,14 @@ namespace Donut::RHI
     auto VulkanDevice::create_shader_module(const std::string& path, VkShaderModule& out) const -> bool
     {
         auto spv = load_spirv(path);
-        if (spv.empty()) { DONUT_ERROR("Vulkan RHI: failed to load SPIR-V {}", path); return false; }
+        if (spv.empty())
+        {
+            std::error_code ec;
+            const auto cwd = std::filesystem::current_path(ec).u8string();
+            DONUT_ERROR("Vulkan RHI: failed to load SPIR-V {} (cwd {}; shaders live in assets/shaders/generated, see tools/compile-shaders.sh)",
+                        path, std::string(cwd.begin(), cwd.end()));
+            return false;
+        }
         VkShaderModuleCreateInfo ci{ VK_STRUCTURE_TYPE_SHADER_MODULE_CREATE_INFO };
         ci.codeSize = spv.size() * 4; ci.pCode = spv.data();
         return vkCreateShaderModule(m_device, &ci, nullptr, &out) == VK_SUCCESS;
@@ -184,6 +201,10 @@ namespace Donut::RHI
         void* mp = nullptr; vkMapMemory(m_device, mem, 0, sz, 0, &mp);
         std::memcpy(out.data(), mp, sz);
         vkUnmapMemory(m_device, mem);
+        const size_t row = (size_t)w * 4;
+        for (uint32_t y = 0; y < h / 2; ++y)
+            std::swap_ranges(out.begin() + (std::ptrdiff_t)(y * row), out.begin() + (std::ptrdiff_t)((y + 1) * row),
+                             out.begin() + (std::ptrdiff_t)((h - 1 - y) * row));
         vkFreeCommandBuffers(m_device, m_command_pool, 1, &cmd);
         vkDestroyBuffer(m_device, buf, nullptr); vkFreeMemory(m_device, mem, nullptr);
     }
@@ -221,6 +242,10 @@ namespace Donut::RHI
         void* mp = nullptr; vkMapMemory(m_device, mem, 0, sz, 0, &mp);
         std::memcpy(out.data(), mp, sz);
         vkUnmapMemory(m_device, mem);
+        const size_t row = (size_t)w * 4;
+        for (uint32_t y = 0; y < h / 2; ++y)
+            std::swap_ranges(out.begin() + (std::ptrdiff_t)(y * row), out.begin() + (std::ptrdiff_t)((y + 1) * row),
+                             out.begin() + (std::ptrdiff_t)((h - 1 - y) * row));
         vkFreeCommandBuffers(m_device, m_command_pool, 1, &cmd);
         vkDestroyBuffer(m_device, buf, nullptr); vkFreeMemory(m_device, mem, nullptr);
     }
@@ -291,6 +316,15 @@ namespace Donut::RHI
 
     auto create_vulkan_device() -> Scope<Device> { return create_scope<VulkanDevice>(); }
 
+    auto vulkan_runtime_available() -> bool
+    {
+#if defined(_WIN32)
+        return LoadLibraryExW(L"vulkan-1.dll", nullptr, LOAD_LIBRARY_SEARCH_SYSTEM32) != nullptr;
+#else
+        return true;
+#endif
+    }
+
     auto vulkan_prepare_glfw() -> void
     {
 #ifdef __APPLE__
-- 
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