ash/src/instance.rs

#![allow(dead_code)]
use prelude::*;
use std::ptr;
use std::mem;
use vk;
use device::Device;
use ::RawPtr;

#[derive(Debug)]
pub enum DeviceError {
    LoadError(String),
    VkError(vk::Result),
}

#[derive(Debug)]
pub struct Instance {
    handle: vk::Instance,
    instance_fn: vk::InstanceFn,
}

impl Instance {
    pub fn handle(&self) -> vk::Instance {
        self.handle
    }

    pub fn from_raw(handle: vk::Instance, instance_fn: vk::InstanceFn) -> Self {
        Instance {
            handle: handle,
            instance_fn: instance_fn,
        }
    }

    pub unsafe fn create_device(&self,
                         physical_device: vk::PhysicalDevice,
                         create_info: &vk::DeviceCreateInfo,
                         allocation_callbacks: Option<&vk::AllocationCallbacks>)
                         -> Result<Device, DeviceError> {
        unsafe {
            let mut device: vk::Device = mem::uninitialized();
            let err_code = self.instance_fn
                .create_device(physical_device, create_info, allocation_callbacks.as_raw_ptr(), &mut device);
            if err_code != vk::Result::Success {
                return Err(DeviceError::VkError(err_code));
            }
            let device_fn = vk::DeviceFn::load(|name| {
                    mem::transmute(self.instance_fn.get_device_proc_addr(device, name.as_ptr()))
                }).map_err(|err| DeviceError::LoadError(err))?;
            Ok(Device::from_raw(device, device_fn))
        }
    }

    pub fn get_device_proc_addr(&self,
                                device: vk::Device,
                                p_name: *const vk::c_char)
                                -> vk::PFN_vkVoidFunction {
        unsafe { self.instance_fn.get_device_proc_addr(device, p_name) }
    }

    pub unsafe fn destroy_instance(&self) {
        self.instance_fn.destroy_instance(self.handle, ptr::null());
    }

    pub fn get_physical_device_format_properties(&self,
                                                 physical_device: vk::PhysicalDevice,
                                                 format: vk::Format)
                                                 -> vk::FormatProperties {
        unsafe {
            let mut format_prop = mem::uninitialized();
            self.instance_fn
                .get_physical_device_format_properties(physical_device, format, &mut format_prop);
            format_prop
        }
    }
    pub fn get_physical_device_memory_properties(&self,
                                                 physical_device: vk::PhysicalDevice)
                                                 -> vk::PhysicalDeviceMemoryProperties {
        unsafe {
            let mut memory_prop = mem::uninitialized();
            self.instance_fn
                .get_physical_device_memory_properties(physical_device, &mut memory_prop);
            memory_prop
        }
    }

    pub fn get_physical_device_queue_family_properties(&self,
                                                       physical_device: vk::PhysicalDevice)
                                                       -> Vec<vk::QueueFamilyProperties> {
        unsafe {
            let mut queue_count = 0;
            self.instance_fn
                .get_physical_device_queue_family_properties(physical_device,
                                                             &mut queue_count,
                                                             ptr::null_mut());
            let mut queue_families_vec = Vec::with_capacity(queue_count as usize);
            self.instance_fn
                .get_physical_device_queue_family_properties(physical_device,
                                                             &mut queue_count,
                                                             queue_families_vec.as_mut_ptr());
            queue_families_vec.set_len(queue_count as usize);
            queue_families_vec
        }
    }

    pub fn enumerate_physical_devices(&self) -> VkResult<Vec<vk::PhysicalDevice>> {
        unsafe {
            let mut num = mem::uninitialized();
            self.instance_fn
                .enumerate_physical_devices(self.handle, &mut num, ptr::null_mut());
            let mut physical_devices = Vec::<vk::PhysicalDevice>::with_capacity(num as usize);
            let err_code = self.instance_fn
                .enumerate_physical_devices(self.handle, &mut num, physical_devices.as_mut_ptr());
            physical_devices.set_len(num as usize);
            match err_code {
                vk::Result::Success => Ok(physical_devices),
                _ => Err(err_code),
            }
        }
    }

    pub fn enumerate_device_extension_properties
        (&self,
         device: vk::PhysicalDevice)
         -> Result<Vec<vk::ExtensionProperties>, vk::Result> {
        unsafe {
            let mut num = 0;
            self.instance_fn
                .enumerate_device_extension_properties(device,
                                                       ptr::null(),
                                                       &mut num,
                                                       ptr::null_mut());
            let mut data = Vec::with_capacity(num as usize);
            let err_code = self.instance_fn
                .enumerate_device_extension_properties(device,
                                                       ptr::null(),
                                                       &mut num,
                                                       data.as_mut_ptr());
            data.set_len(num as usize);
            match err_code {
                vk::Result::Success => Ok(data),
                _ => Err(err_code),
            }
        }
    }
}