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internal/graphicsdriver/directx: defer the initialization

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This commit is contained in:
Hajime Hoshi 2022-05-29 22:02:39 +09:00
parent b4491ab94d
commit 59798d29f4
1 changed files with 14 additions and 7 deletions
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21
internal/graphicsdriver/directx/graphics_windows.go
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@ -20,6 +20,7 @@ import (
"os"
"reflect"
"strings"
"sync"
"unsafe"
"golang.org/x/sys/windows"
@ -32,18 +33,24 @@ import (
const frameCount = 2
const is64bit = uint64(^uintptr(0)) == ^uint64(0)
// isDirectXAvailable indicates whether DirectX is available or not.
// In 32bit machines, DirectX is not used because
// 1) The functions syscall.Syscall cannot accept 64bit values as one argument
// 2) The struct layouts can be different
// TODO: Support DirectX for 32bit machines (#2088).
var isDirectXAvailable = is64bit && theGraphics.initializeDevice() == nil
var (
isDirectXAvailable bool
isDirectXAvailableOnce sync.Once
)
var theGraphics Graphics
func Get() *Graphics {
isDirectXAvailableOnce.Do(func() {
const is64bit = uint64(^uintptr(0)) == ^uint64(0)
// In 32bit machines, DirectX is not used because
// 1) The functions syscall.Syscall cannot accept 64bit values as one argument
// 2) The struct layouts can be different
// TODO: Support DirectX for 32bit machines (#2088).
isDirectXAvailable = is64bit && theGraphics.initializeDevice() == nil
})
if !isDirectXAvailable {
return nil
}