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// SPDX-License-Identifier: Unlicense OR MIT
//go:build (linux || freebsd) && !novulkan
// +build linux freebsd
// +build !novulkan
package app
import (
"errors"
"unsafe"
"gioui.org/gpu"
"gioui.org/internal/vk"
)
type vkContext struct {
physDev vk.PhysicalDevice
inst vk.Instance
dev vk.Device
queueFam int
queue vk.Queue
acquireSem vk.Semaphore
presentSem vk.Semaphore
swchain vk.Swapchain
imgs []vk.Image
views []vk.ImageView
fbos []vk.Framebuffer
format vk.Format
presentIdx int
}
func newVulkanContext(inst vk.Instance, surf vk.Surface) (*vkContext, error) {
physDev, qFam, err := vk.ChoosePhysicalDevice(inst, surf)
if err != nil {
return nil, err
}
dev, err := vk.CreateDeviceAndQueue(physDev, qFam, "VK_KHR_swapchain")
if err != nil {
return nil, err
}
if err != nil {
vk.DestroyDevice(dev)
return nil, err
}
acquireSem, err := vk.CreateSemaphore(dev)
if err != nil {
vk.DestroyDevice(dev)
return nil, err
}
presentSem, err := vk.CreateSemaphore(dev)
if err != nil {
vk.DestroySemaphore(dev, acquireSem)
vk.DestroyDevice(dev)
return nil, err
}
c := &vkContext{
physDev: physDev,
inst: inst,
dev: dev,
queueFam: qFam,
queue: vk.GetDeviceQueue(dev, qFam, 0),
acquireSem: acquireSem,
presentSem: presentSem,
}
return c, nil
}
func (c *vkContext) RenderTarget() (gpu.RenderTarget, error) {
vk.DeviceWaitIdle(c.dev)
imgIdx, err := vk.AcquireNextImage(c.dev, c.swchain, c.acquireSem, 0)
if err := mapSurfaceErr(err); err != nil {
return nil, err
}
c.presentIdx = imgIdx
return gpu.VulkanRenderTarget{
WaitSem: uint64(c.acquireSem),
SignalSem: uint64(c.presentSem),
Framebuffer: uint64(c.fbos[imgIdx]),
Image: uint64(c.imgs[imgIdx]),
}, nil
}
func (c *vkContext) api() gpu.API {
return gpu.Vulkan{
PhysDevice: unsafe.Pointer(c.physDev),
Device: unsafe.Pointer(c.dev),
Format: int(c.format),
QueueFamily: c.queueFam,
QueueIndex: 0,
}
}
func mapErr(err error) error {
var vkErr vk.Error
if errors.As(err, &vkErr) && vkErr == vk.ERROR_DEVICE_LOST {
return gpu.ErrDeviceLost
}
return err
}
func mapSurfaceErr(err error) error {
var vkErr vk.Error
if !errors.As(err, &vkErr) {
return err
}
switch {
case vkErr == vk.SUBOPTIMAL_KHR:
// Android reports VK_SUBOPTIMAL_KHR when presenting to a rotated
// swapchain (preTransform != currentTransform). However, we don't
// support transforming the output ourselves, so we'll live with it.
return nil
case vkErr == vk.ERROR_OUT_OF_DATE_KHR:
return errOutOfDate
case vkErr == vk.ERROR_SURFACE_LOST_KHR:
// Treating a lost surface as a lost device isn't accurate, but
// probably not worth optimizing.
return gpu.ErrDeviceLost
}
return mapErr(err)
}
func (c *vkContext) release() {
vk.DeviceWaitIdle(c.dev)
c.destroySwapchain()
vk.DestroySemaphore(c.dev, c.acquireSem)
vk.DestroySemaphore(c.dev, c.presentSem)
vk.DestroyDevice(c.dev)
*c = vkContext{}
}
func (c *vkContext) present() error {
return mapSurfaceErr(vk.PresentQueue(c.queue, c.swchain, c.presentSem, c.presentIdx))
}
func (c *vkContext) destroyImageViews() {
for _, f := range c.fbos {
vk.DestroyFramebuffer(c.dev, f)
}
c.fbos = nil
for _, view := range c.views {
vk.DestroyImageView(c.dev, view)
}
c.views = nil
}
func (c *vkContext) destroySwapchain() {
vk.DeviceWaitIdle(c.dev)
c.destroyImageViews()
if c.swchain != 0 {
vk.DestroySwapchain(c.dev, c.swchain)
c.swchain = 0
}
}
func (c *vkContext) refresh(surf vk.Surface, width, height int) error {
vk.DeviceWaitIdle(c.dev)
c.destroyImageViews()
// Check whether size is valid. That's needed on X11, where ConfigureNotify
// is not always synchronized with the window extent.
caps, err := vk.GetPhysicalDeviceSurfaceCapabilities(c.physDev, surf)
if err != nil {
return err
}
minExt, maxExt := caps.MinExtent(), caps.MaxExtent()
if width < minExt.X || maxExt.X < width || height < minExt.Y || maxExt.Y < height {
return errOutOfDate
}
swchain, imgs, format, err := vk.CreateSwapchain(c.physDev, c.dev, surf, width, height, c.swchain)
if c.swchain != 0 {
vk.DestroySwapchain(c.dev, c.swchain)
c.swchain = 0
}
if err := mapSurfaceErr(err); err != nil {
return err
}
c.swchain = swchain
c.imgs = imgs
c.format = format
pass, err := vk.CreateRenderPass(
c.dev,
format,
vk.ATTACHMENT_LOAD_OP_CLEAR,
vk.IMAGE_LAYOUT_UNDEFINED,
vk.IMAGE_LAYOUT_PRESENT_SRC_KHR,
nil,
)
if err := mapErr(err); err != nil {
return err
}
defer vk.DestroyRenderPass(c.dev, pass)
for _, img := range imgs {
view, err := vk.CreateImageView(c.dev, img, format)
if err := mapErr(err); err != nil {
return err
}
c.views = append(c.views, view)
fbo, err := vk.CreateFramebuffer(c.dev, pass, view, width, height)
if err := mapErr(err); err != nil {
return err
}
c.fbos = append(c.fbos, fbo)
}
return nil
}
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