Windows ARM64 support (in the not too distant future)

[ArminiusTux]

Iris compiles nicely via @msys2, but the Vulkan requirements are a bit too demanding for Snapdragon SoCs on Windows (ARM64).

iris
vulkan: Using Vulkan device "Qualcomm(R) Adreno(TM) X1-85 GPU". API version 1.3.295.0 Driver version 8035f000
vulkan: Requested device extension not supported: VK_EXT_descriptor_buffer
vulkan: Requested device extension not supported: VK_EXT_memory_priority
vulkan: Requested device extension not supported: VK_EXT_memory_budget
vulkan: Requested device extension not supported: VK_EXT_pageable_device_local_memory
vulkan: Requested device extension not supported: VK_EXT_external_memory_host
vulkan: Failed to create Vulkan device
iris: Failed to initialize Vulkan
iris: Failed to initialize instance

iris -v
iris (0.20-alpha unknown)
Copyright (C) 2025 Allkern/Lisandro Alarcon

MIT License
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

[PucklaJ]

It seems to me that some extensions are not needed. For example the VK_EXT_external_memory_host extension which is missing in the PanVK Mesa driver for my RK3588 (and more than half of all Mesa drivers), is not used in the codebase or in parallel-gs. Maybe @allkern just added some extensions without actually using them. Or is planning to use them later. I couldn't find a single call to a function ending with EXT.

@allkern Correct me if I am wrong, but it seems that at least the VK_EXT_external_memory_host extension is not used.

Nevermind, I found calls to the extensions in Granite, the vulkan renderer.

But still, the vulkan renderer requires too many extensions. Fallbacks for drivers where these are not available need to be developed.

[allkern]

Thanks for the insights, the use of Vulkan extensions depends on Parallel-GS, which I sadly have no direct control over. I can contact the developer, but I can't really give an ETA on this unfortunately, I'll leave this issue open as a reminder