internal/ui: use -overlay to provide the implementation for Nintendo Switch

Closes #2372

doc.go

@@ -104,4 +104,6 @@
 // `microsoftgdk` is for Microsoft GDK (e.g. Xbox).
 //
 // `nintendosdk` is for NintendoSDK (e.g. Nintendo Switch).
+//
+// `nintendosdkprofile` enables a profiler for NintendoSDK.
 package ebiten

internal/ui/egl_nintendosdk.go

@@ -0,0 +1,93 @@
+// Copyright 2023 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 nintendosdk
+
+package ui
+
+// #include <EGL/egl.h>
+// #include <EGL/eglext.h>
+import "C"
+
+import (
+	"fmt"
+)
+
+type egl struct {
+	display C.EGLDisplay
+	surface C.EGLSurface
+	context C.EGLContext
+}
+
+func (e *egl) init(nativeWindowHandle C.NativeWindowType) error {
+	// Initialize EGL
+	e.display = C.eglGetDisplay(C.EGL_DEFAULT_DISPLAY)
+	if e.display == 0 {
+		return fmt.Errorf("ui: eglGetDisplay failed")
+	}
+
+	if r := C.eglInitialize(e.display, nil, nil); r == 0 {
+		return fmt.Errorf("ui: eglInitialize failed")
+	}
+
+	configAttribs := []C.EGLint{
+		C.EGL_RENDERABLE_TYPE, C.EGL_OPENGL_BIT,
+		C.EGL_SURFACE_TYPE, C.EGL_WINDOW_BIT,
+		C.EGL_RED_SIZE, 8,
+		C.EGL_GREEN_SIZE, 8,
+		C.EGL_BLUE_SIZE, 8,
+		C.EGL_ALPHA_SIZE, 8,
+		C.EGL_NONE}
+	var numConfigs C.EGLint
+	var config C.EGLConfig
+	if r := C.eglChooseConfig(e.display, &configAttribs[0], &config, 1, &numConfigs); r == 0 {
+		return fmt.Errorf("ui: eglChooseConfig failed")
+	}
+	if numConfigs != 1 {
+		return fmt.Errorf("ui: eglChooseConfig failed: numConfigs must be 1 but %d", numConfigs)
+	}
+
+	e.surface = C.eglCreateWindowSurface(e.display, config, nativeWindowHandle, nil)
+	if e.surface == C.EGL_NO_SURFACE {
+		return fmt.Errorf("ui: eglCreateWindowSurface failed")
+	}
+
+	// Set the current rendering API.
+	if r := C.eglBindAPI(C.EGL_OPENGL_API); r == 0 {
+		return fmt.Errorf("ui: eglBindAPI failed")
+	}
+
+	// Create new context and set it as current.
+	contextAttribs := []C.EGLint{
+		// Set target garaphics api version.
+		C.EGL_CONTEXT_MAJOR_VERSION, 2,
+		C.EGL_CONTEXT_MINOR_VERSION, 1,
+		// For debug callback
+		C.EGL_CONTEXT_FLAGS_KHR, C.EGL_CONTEXT_OPENGL_DEBUG_BIT_KHR,
+		C.EGL_NONE}
+	e.context = C.eglCreateContext(e.display, config, C.EGL_NO_CONTEXT, &contextAttribs[0])
+	if e.context == C.EGL_NO_CONTEXT {
+		return fmt.Errorf("ui: eglCreateContext failed: error: %d", C.eglGetError())
+	}
+
+	if r := C.eglMakeCurrent(e.display, e.surface, e.surface, e.context); r == 0 {
+		return fmt.Errorf("ui: eglMakeCurrent failed")
+	}
+
+	return nil
+}
+
+func (e *egl) swapBuffers() {
+	C.eglSwapBuffers(e.display, e.surface)
+}

internal/ui/init_nintendosdk.cpp

@@ -1,4 +1,4 @@
-// Copyright 2021 The Ebiten Authors
+// Copyright 2023 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.
@@ -14,27 +14,12 @@
 
 //go:build nintendosdk
 
-package nintendosdk
+// The actual implementaiton will be provided by -overlay.
 
-// #cgo !darwin LDFLAGS: -Wl,-unresolved-symbols=ignore-all
-// #cgo darwin LDFLAGS: -Wl,-undefined,dynamic_lookup
-//
-// #include <stdint.h>
-//
-// // UI
-// void EbitenInitializeGame();
-// void EbitenBeginFrame();
-// void EbitenEndFrame();
-import "C"
+#include "init_nintendosdk.h"
 
-func InitializeGame() {
-	C.EbitenInitializeGame()
-}
+extern "C" NativeWindowType ebitengine_Init() {}
 
-func BeginFrame() {
-	C.EbitenBeginFrame()
-}
+extern "C" void ebitengine_InitializeProfiler() {}
 
-func EndFrame() {
-	C.EbitenEndFrame()
-}
+extern "C" void ebitengine_RecordProfilerHeartbeat() {}

internal/ui/init_nintendosdk.h

@@ -0,0 +1,29 @@
+// Copyright 2023 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 nintendosdk
+
+#include <EGL/egl.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+NativeWindowType ebitengine_Init();
+void ebitengine_InitializeProfiler();
+void ebitengine_RecordProfilerHeartbeat();
+
+#ifdef __cplusplus
+} // extern "C"
+#endif

internal/ui/notprofile_nintendosdk.go

@@ -0,0 +1,23 @@
+// Copyright 2023 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 nintendosdk && !nintendosdkprofile
+
+package ui
+
+func initializeProfiler() {
+}
+
+func recordProfilerHeartbeat() {
+}

internal/ui/profile_nintendosdk.go

@@ -0,0 +1,28 @@
+// Copyright 2023 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 nintendosdk && nintendosdkprofile
+
+package ui
+
+// #include "init_nintendosdk.h"
+import "C"
+
+func initializeProfiler() {
+	C.ebitengine_InitializeProfiler()
+}
+
+func recordProfilerHeartbeat() {
+	C.ebitengine_RecordProfilerHeartbeat()
+}

internal/ui/ui_nintendosdk.go

@@ -16,6 +16,7 @@
 
 package ui
 
+// #include "init_nintendosdk.h"
 // #include "input_nintendosdk.h"
 import "C"
 
@@ -25,7 +26,6 @@ import (
 	"github.com/hajimehoshi/ebiten/v2/internal/gamepad"
 	"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver"
 	"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver/opengl"
-	"github.com/hajimehoshi/ebiten/v2/internal/nintendosdk"
 )
 
 type graphicsDriverCreatorImpl struct{}
@@ -59,6 +59,8 @@ type userInterfaceImpl struct {
 	context       *context
 	inputState    InputState
 	nativeTouches []C.struct_Touch
+
+	egl egl
 }
 
 func (u *userInterfaceImpl) Run(game Game, options *RunOptions) error {
@@ -68,10 +70,18 @@ func (u *userInterfaceImpl) Run(game Game, options *RunOptions) error {
 		return err
 	}
 	u.graphicsDriver = g
-	nintendosdk.InitializeGame()
+
+	n := C.ebitengine_Init()
+	if err := u.egl.init(n); err != nil {
+		return err
+	}
+
+	initializeProfiler()
+
 	for {
+		recordProfilerHeartbeat()
+
 		// TODO: Make a separate thread for rendering (#2512).
-		nintendosdk.BeginFrame()
 		gamepad.Update()
 		u.updateInputState()
 
@@ -79,7 +89,7 @@ func (u *userInterfaceImpl) Run(game Game, options *RunOptions) error {
 			return err
 		}
 
-		nintendosdk.EndFrame()
+		u.egl.swapBuffers()
 	}
 }