internal/cocoa: remove IsIOS

Use `runtime.GOOS == "ios"` instead.

Closes #1415

internal/cocoa/ios_darwin.go

@@ -1,20 +0,0 @@
-// Copyright 2022 The Ebitengine Authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-//go:build ios
-// +build ios
-
-package cocoa
-
-const IsIOS = true

internal/cocoa/notios_darwin.go

@@ -1,20 +0,0 @@
-// Copyright 2022 The Ebitengine Authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-//go:build !ios
-// +build !ios
-
-package cocoa
-
-const IsIOS = false

internal/graphicsdriver/metal/ca/ca_darwin.go

@@ -22,6 +22,7 @@ package ca
 import (
 	"errors"
 	"fmt"
+	"runtime"
 	"unsafe"
 
 	"github.com/ebitengine/purego"
@@ -59,7 +60,7 @@ var (
 // Reference: https://developer.apple.com/documentation/quartzcore/cametallayer.
 func MakeMetalLayer() MetalLayer {
 	layer := objc.ID(objc.GetClass("CAMetalLayer")).Send(objc.RegisterName("new"))
-	if !cocoa.IsIOS {
+	if runtime.GOOS != "ios" {
 		colorspace, _, _ := purego.SyscallN(_CGColorSpaceCreateWithName, **(**uintptr)(unsafe.Pointer(&kCGColorSpaceDisplayP3))) // Dlsym returns pointer to symbol so dereference it
 		layer.Send(objc.RegisterName("setColorspace:"), colorspace)
 		purego.SyscallN(_CGColorSpaceRelease, colorspace)
@@ -125,7 +126,7 @@ func (ml MetalLayer) SetMaximumDrawableCount(count int) {
 //
 // Reference: https://developer.apple.com/documentation/quartzcore/cametallayer/2887087-displaysyncenabled.
 func (ml MetalLayer) SetDisplaySyncEnabled(enabled bool) {
-	if cocoa.IsIOS {
+	if runtime.GOOS == "ios" {
 		return
 	}
 	ml.metalLayer.Send(objc.RegisterName("setDisplaySyncEnabled:"), enabled)

internal/graphicsdriver/metal/mtl/mtl_darwin.go

@@ -26,6 +26,7 @@ import (
 	"errors"
 	"fmt"
 	"reflect"
+	"runtime"
 	"unsafe"
 
 	"github.com/ebitengine/purego"
@@ -559,7 +560,7 @@ func CreateSystemDefaultDevice() (Device, bool) {
 		lowPower bool
 		name     string
 	)
-	if !cocoa.IsIOS {
+	if runtime.GOOS != "ios" {
 		headless = int(objc.ID(d).Send(sel_isHeadless)) != 0
 		lowPower = int(objc.ID(d).Send(sel_isLowPower)) != 0
 	}
@@ -941,14 +942,14 @@ type BlitCommandEncoder struct {
 //
 // Reference: https://developer.apple.com/documentation/metal/mtlblitcommandencoder/1400775-synchronize.
 func (bce BlitCommandEncoder) Synchronize(resource Resource) {
-	if cocoa.IsIOS {
+	if runtime.GOOS == "ios" {
 		return
 	}
 	bce.commandEncoder.Send(sel_synchronizeResource, resource.resource())
 }
 
 func (bce BlitCommandEncoder) SynchronizeTexture(texture Texture, slice int, level int) {
-	if cocoa.IsIOS {
+	if runtime.GOOS == "ios" {
 		return
 	}
 	bce.commandEncoder.Send(sel_synchronizeTexture_slice_level, texture.texture, slice, level)
@@ -1081,7 +1082,7 @@ func (b Buffer) CopyToContents(data unsafe.Pointer, lengthInBytes uintptr) {
 	dataHeader.Len = int(lengthInBytes)
 	dataHeader.Cap = int(lengthInBytes)
 	copy(contentSlice, dataSlice)
-	if !cocoa.IsIOS {
+	if runtime.GOOS != "ios" {
 		b.buffer.Send(sel_didModifyRange, 0, lengthInBytes)
 	}
 }