Orkuncakilkaya
208cad7ca1
ludic-dev vkgen reads vk.xml into runtime/native/vk_api.ludic (constants, every struct's <Struct>_sizeof and <Struct>_<field> offsets, one extern per command) and vk_thunks.ll. Every size and offset was compiled against the SDK's C headers; `ludic-dev test` checks the tracked files against the registry wherever the Vulkan SDK is installed. vk_win.ll (vulkan-1.dll) and vk_mac.ll (libvulkan.1.dylib, MoltenVK) open the loader at run time, so a program built with Vk.* starts on a machine without Vulkan. ludicc and ludic build link both for any program that uses Vk.*. The seeds are regenerated for the new compiler. vk_probe reports what a machine's Vulkan can do; vk_compute dispatches a Slang compute shader and reads the picture back, clean under the validation layer on an RTX 3070 Ti and on an M4 Pro through MoltenVK. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
110 lines
3.2 KiB
LLVM
110 lines
3.2 KiB
LLVM
; ============================================================================
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; vk_mac.ll — the Vulkan loader, for macOS, written in LLVM IR.
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;
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; macOS has no Vulkan of its own: the LunarG loader and MoltenVK (Vulkan over
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; Metal) come with the Vulkan SDK or with a game that bundles them. So the loader
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; is looked for at run time - beside the executable, in the usual library
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; directories, then under $VULKAN_SDK - and a Mac without it gets 0 from vk_open
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; and stays on OpenGL. The contract is vk_win.ll's:
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;
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; lvk_open() -> 1 | 0 lvk_sym(name) -> ptr lvk_has(name) -> 1 | 0
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;
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; MoltenVK is a portability driver: an instance must ask for
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; VK_KHR_portability_enumeration (and the ENUMERATE_PORTABILITY flag) to see it.
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; ============================================================================
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declare ptr @dlopen(ptr, i32)
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declare ptr @dlsym(ptr, ptr)
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declare ptr @getenv(ptr)
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declare i32 @snprintf(ptr, i64, ptr, ...)
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declare i32 @lvk_bind()
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@.lvk_c0 = private unnamed_addr constant [18 x i8] c"libvulkan.1.dylib\00"
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@.lvk_c1 = private unnamed_addr constant [35 x i8] c"@executable_path/libvulkan.1.dylib\00"
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@.lvk_c2 = private unnamed_addr constant [33 x i8] c"/usr/local/lib/libvulkan.1.dylib\00"
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@.lvk_c3 = private unnamed_addr constant [36 x i8] c"/opt/homebrew/lib/libvulkan.1.dylib\00"
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@.lvk_env = private unnamed_addr constant [11 x i8] c"VULKAN_SDK\00"
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@.lvk_fmt = private unnamed_addr constant [25 x i8] c"%s/lib/libvulkan.1.dylib\00"
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@lvk_lib = internal global ptr null
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; RTLD_NOW (2) | RTLD_LOCAL (4)
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define internal ptr @lvk_try(ptr %path) {
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entry:
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%h = call ptr @dlopen(ptr %path, i32 6)
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ret ptr %h
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}
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define i32 @lvk_open() {
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entry:
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%have = load ptr, ptr @lvk_lib
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%open = icmp ne ptr %have, null
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br i1 %open, label %ok, label %t0
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t0:
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%h0 = call ptr @lvk_try(ptr @.lvk_c0)
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%n0 = icmp eq ptr %h0, null
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br i1 %n0, label %t1, label %got0
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got0:
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store ptr %h0, ptr @lvk_lib
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br label %bind
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t1:
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%h1 = call ptr @lvk_try(ptr @.lvk_c1)
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%n1 = icmp eq ptr %h1, null
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br i1 %n1, label %t2, label %got1
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got1:
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store ptr %h1, ptr @lvk_lib
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br label %bind
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t2:
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%h2 = call ptr @lvk_try(ptr @.lvk_c2)
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%n2 = icmp eq ptr %h2, null
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br i1 %n2, label %t3, label %got2
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got2:
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store ptr %h2, ptr @lvk_lib
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br label %bind
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t3:
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%h3 = call ptr @lvk_try(ptr @.lvk_c3)
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%n3 = icmp eq ptr %h3, null
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br i1 %n3, label %t4, label %got3
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got3:
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store ptr %h3, ptr @lvk_lib
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br label %bind
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t4:
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%sdk = call ptr @getenv(ptr @.lvk_env)
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%nosdk = icmp eq ptr %sdk, null
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br i1 %nosdk, label %fail, label %t4b
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t4b:
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%buf = alloca [1024 x i8]
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%w = call i32 (ptr, i64, ptr, ...) @snprintf(ptr %buf, i64 1024, ptr @.lvk_fmt, ptr %sdk)
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%h4 = call ptr @lvk_try(ptr %buf)
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%n4 = icmp eq ptr %h4, null
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br i1 %n4, label %fail, label %got4
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got4:
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store ptr %h4, ptr @lvk_lib
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br label %bind
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bind:
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%n = call i32 @lvk_bind()
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br label %ok
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ok:
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ret i32 1
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fail:
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ret i32 0
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}
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define ptr @lvk_sym(ptr %name) {
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entry:
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%lib = load ptr, ptr @lvk_lib
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%none = icmp eq ptr %lib, null
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br i1 %none, label %no, label %look
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look:
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%p = call ptr @dlsym(ptr %lib, ptr %name)
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ret ptr %p
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no:
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ret ptr null
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}
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define i32 @lvk_has(ptr %name) {
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entry:
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%p = call ptr @lvk_sym(ptr %name)
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%there = icmp ne ptr %p, null
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%r = zext i1 %there to i32
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ret i32 %r
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}
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