From d7c1ced08d5d78fcb239550404db4e67d4357a19 Mon Sep 17 00:00:00 2001
From: hachem <im@hachem.wtf>
Date: Tue, 22 Sep 2026 06:57:16 +0200
Subject: fix: windows support

---
 premake5.lua | 77 ++++++++++++++++++++++++++++++++++++++++++------------------
 1 file changed, 54 insertions(+), 23 deletions(-)

(limited to 'premake5.lua')

diff --git a/premake5.lua b/premake5.lua
index 27a11e2..88cf22a 100644
--- a/premake5.lua
+++ b/premake5.lua
@@ -1,5 +1,12 @@
 output_dir = "%{cfg.buildcfg}-%{cfg.system}"
 
+-- the LunarG installer sets this on windows. without it the vulkan backend is
+-- left out of the build (DONUT_NO_VULKAN) and the app runs opengl only.
+vulkan_sdk = os.getenv("VULKAN_SDK")
+if os.target() == "windows" and not vulkan_sdk then
+	print("VULKAN_SDK is not set: building without the Vulkan backend (OpenGL only)")
+end
+
 include_dir = {
 	glm = "ext/glm",
 	glfw = "ext/glfw/include",
@@ -38,19 +45,21 @@ function setup_c_target()
 		runtime "Debug"
 		symbols "On"
 
-		filter { "system:macosx or system:linux" }
-			buildoptions {
-				"-g",
-				"-fno-omit-frame-pointer",
-				"-fsanitize=address,undefined",
-			}
+	-- premake filters don't nest: this one has to name debug again, or the
+	-- sanitizers end up in every config
+	filter { "configurations:debug", "system:macosx or system:linux" }
+		buildoptions {
+			"-g",
+			"-fno-omit-frame-pointer",
+			"-fsanitize=address,undefined",
+		}
 
-			linkoptions {
-				"-fsanitize=address,undefined",
-			}
-		filter {}
+		linkoptions {
+			"-fsanitize=address,undefined",
+		}
+	filter {}
 
-	filter { "configurations:release", "configurations:dist" }
+	filter "configurations:release or dist"
 		runtime "Release"
 		optimize "Speed"
 	filter {}
@@ -78,19 +87,21 @@ function setup_cpp_target()
 		runtime "Debug"
 		symbols "On"
 
-		filter { "system:macosx or system:linux" }
-			buildoptions {
-				"-g",
-				"-fno-omit-frame-pointer",
-				"-fsanitize=address,undefined",
-			}
+	-- premake filters don't nest: this one has to name debug again, or the
+	-- sanitizers end up in every config
+	filter { "configurations:debug", "system:macosx or system:linux" }
+		buildoptions {
+			"-g",
+			"-fno-omit-frame-pointer",
+			"-fsanitize=address,undefined",
+		}
 
-			linkoptions {
-				"-fsanitize=address,undefined",
-			}
-		filter {}
+		linkoptions {
+			"-fsanitize=address,undefined",
+		}
+	filter {}
 
-	filter { "configurations:release", "configurations:dist" }
+	filter "configurations:release or dist"
 		runtime "Release"
 		optimize "Speed"
 	filter {}
@@ -335,6 +346,10 @@ project "imgui"
 		externalincludedirs "/opt/homebrew/include"
 	filter "system:windows"
 		systemversion "latest"
+		if vulkan_sdk then
+			files "ext/imgui/backends/imgui_impl_vulkan.cpp"
+			externalincludedirs (vulkan_sdk .. "/Include")
+		end
 	filter {}
 
 project "imguizmo"
@@ -387,6 +402,7 @@ project "donut"
 	}
 
 	includedirs "src"
+	debugdir "%{wks.location}"   -- every asset path is relative to the repo root
 
 	externalincludedirs {
 		"%{include_dir.glm}",
@@ -413,7 +429,22 @@ project "donut"
 
 	filter "system:windows"
 		systemversion "latest"
-		links "opengl32.lib"
+		defines "NOMINMAX"             -- glad drags in windows.h, whose min/max macros eat std::min/std::max
+		usestandardpreprocessor "On"   -- msvc only knows __VA_OPT__ (log.h) with its conforming preprocessor
+		conformancemode "On"
+		buildoptions "/utf-8"
+		links "opengl32"
+		if vulkan_sdk then
+			externalincludedirs (vulkan_sdk .. "/Include")
+			libdirs (vulkan_sdk .. "/Lib")
+			-- delay-loaded, so a box without a Vulkan driver still starts (on OpenGL)
+			-- instead of the loader refusing to run the exe at all
+			links { "vulkan-1", "delayimp" }
+			linkoptions "/DELAYLOAD:vulkan-1.dll"
+		else
+			defines "DONUT_NO_VULKAN"
+			removefiles "src/platform/vulkan/**"
+		end
 
 	filter "system:macosx"
 		files "src/**.mm"
-- 
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