ebiten/internal/ui/ui_android.go

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// Copyright 2022 The Ebiten Authors
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//
// 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.
package ui
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/*
#include <jni.h>
#include <stdlib.h>
// The following JNI code works as this pseudo Java code:
//
// WindowService windowService = context.getSystemService(Context.WINDOW_SERVICE);
// Display display = windowManager.getDefaultDisplay();
// DisplayMetrics displayMetrics = new DisplayMetrics();
// display.getRealMetrics(displayMetrics);
// return displayMetrics.widthPixels, displayMetrics.heightPixels, displayMetrics.density;
//
static void displayInfo(int* width, int* height, float* scale, uintptr_t java_vm, uintptr_t jni_env, uintptr_t ctx) {
*width = 0;
*height = 0;
*scale = 1;
JavaVM* vm = (JavaVM*)java_vm;
JNIEnv* env = (JNIEnv*)jni_env;
jobject context = (jobject)ctx;
const char* kWindowService = "window";
const jclass android_content_Context =
(*env)->FindClass(env, "android/content/Context");
const jclass android_view_WindowManager =
(*env)->FindClass(env, "android/view/WindowManager");
const jclass android_view_Display =
(*env)->FindClass(env, "android/view/Display");
const jclass android_util_DisplayMetrics =
(*env)->FindClass(env, "android/util/DisplayMetrics");
const jobject android_context_Context_WINDOW_SERVICE =
(*env)->GetStaticObjectField(
env, android_content_Context,
(*env)->GetStaticFieldID(env, android_content_Context, "WINDOW_SERVICE", "Ljava/lang/String;"));
const jobject windowManager =
(*env)->CallObjectMethod(
env, context,
(*env)->GetMethodID(env, android_content_Context, "getSystemService", "(Ljava/lang/String;)Ljava/lang/Object;"),
android_context_Context_WINDOW_SERVICE);
const jobject display =
(*env)->CallObjectMethod(
env, windowManager,
(*env)->GetMethodID(env, android_view_WindowManager, "getDefaultDisplay", "()Landroid/view/Display;"));
const jobject displayMetrics =
(*env)->NewObject(
env, android_util_DisplayMetrics,
(*env)->GetMethodID(env, android_util_DisplayMetrics, "<init>", "()V"));
(*env)->CallVoidMethod(
env, display,
(*env)->GetMethodID(env, android_view_Display, "getRealMetrics", "(Landroid/util/DisplayMetrics;)V"),
displayMetrics);
*width =
(*env)->GetIntField(
env, displayMetrics,
(*env)->GetFieldID(env, android_util_DisplayMetrics, "widthPixels", "I"));
*height =
(*env)->GetIntField(
env, displayMetrics,
(*env)->GetFieldID(env, android_util_DisplayMetrics, "heightPixels", "I"));
*scale =
(*env)->GetFloatField(
env, displayMetrics,
(*env)->GetFieldID(env, android_util_DisplayMetrics, "density", "F"));
(*env)->DeleteLocalRef(env, android_content_Context);
(*env)->DeleteLocalRef(env, android_view_WindowManager);
(*env)->DeleteLocalRef(env, android_view_Display);
(*env)->DeleteLocalRef(env, android_util_DisplayMetrics);
(*env)->DeleteLocalRef(env, android_context_Context_WINDOW_SERVICE);
(*env)->DeleteLocalRef(env, windowManager);
(*env)->DeleteLocalRef(env, display);
(*env)->DeleteLocalRef(env, displayMetrics);
}
*/
import "C"
import (
"errors"
"github.com/ebitengine/gomobile/app"
"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver"
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"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver/opengl"
)
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type graphicsDriverCreatorImpl struct {
colorSpace graphicsdriver.ColorSpace
}
func (g *graphicsDriverCreatorImpl) newAuto() (graphicsdriver.Graphics, GraphicsLibrary, error) {
graphics, err := g.newOpenGL()
return graphics, GraphicsLibraryOpenGL, err
}
func (g *graphicsDriverCreatorImpl) newOpenGL() (graphicsdriver.Graphics, error) {
return opengl.NewGraphics()
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}
func (*graphicsDriverCreatorImpl) newDirectX() (graphicsdriver.Graphics, error) {
return nil, errors.New("ui: DirectX is not supported in this environment")
}
func (*graphicsDriverCreatorImpl) newMetal() (graphicsdriver.Graphics, error) {
return nil, errors.New("ui: Metal is not supported in this environment")
}
func (*graphicsDriverCreatorImpl) newPlayStation5() (graphicsdriver.Graphics, error) {
return nil, errors.New("ui: PlayStation 5 is not supported in this environment")
}
func dipToNativePixels(x float64, scale float64) float64 {
return x * scale
}
func dipFromNativePixels(x float64, scale float64) float64 {
return x / scale
}
func (u *UserInterface) displayInfo() (int, int, float64, bool) {
var cWidth, cHeight C.int
var cScale C.float
if err := app.RunOnJVM(func(vm, env, ctx uintptr) error {
C.displayInfo(&cWidth, &cHeight, &cScale, C.uintptr_t(vm), C.uintptr_t(env), C.uintptr_t(ctx))
return nil
}); err != nil {
// JVM is not ready yet.
// TODO: Fix gomobile to detect the error type for this case.
return 0, 0, 1, false
}
scale := float64(cScale)
width := int(dipFromNativePixels(float64(cWidth), scale))
height := int(dipFromNativePixels(float64(cHeight), scale))
return width, height, scale, true
}