Revert "Remove the Android display resolution selector"

This reverts commit ea0eaa3.

Common/System/Request.h

@@ -111,6 +111,10 @@ inline void System_RestartApp(const std::string &params) {
 	g_requestManager.MakeSystemRequest(SystemRequestType::RESTART_APP, nullptr, nullptr, params, "", 0);
 }
 
+inline void System_RecreateActivity() {
+	g_requestManager.MakeSystemRequest(SystemRequestType::RECREATE_ACTIVITY, nullptr, nullptr, "", "", 0);
+}
+
 // The design is a little weird, just a holdover from the old message. Can either toggle or set to on or off.
 inline void System_ToggleFullscreenState(const std::string &param) {
 	g_requestManager.MakeSystemRequest(SystemRequestType::TOGGLE_FULLSCREEN_STATE, nullptr, nullptr, param, "", 0);

Common/System/System.h

@@ -63,6 +63,7 @@ enum class SystemRequestType {
 
 	EXIT_APP,
 	RESTART_APP,  // For graphics backend changes
+	RECREATE_ACTIVITY,  // Android
 	COPY_TO_CLIPBOARD,
 	SHARE_TEXT,
 	SET_WINDOW_TITLE,

Core/Config.cpp

@@ -300,6 +300,34 @@ static int DefaultFastForwardMode() {
 #endif
 }
 
+static int DefaultAndroidHwScale() {
+#ifdef __ANDROID__
+	if (System_GetPropertyInt(SYSPROP_SYSTEMVERSION) >= 19 || System_GetPropertyInt(SYSPROP_DEVICE_TYPE) == DEVICE_TYPE_TV) {
+		// Arbitrary cutoff at Kitkat - modern devices are usually powerful enough that hw scaling
+		// doesn't really help very much and mostly causes problems. See #11151
+		return 0;
+	}
+
+	// Get the real resolution as passed in during startup, not dp_xres and stuff
+	int xres = System_GetPropertyInt(SYSPROP_DISPLAY_XRES);
+	int yres = System_GetPropertyInt(SYSPROP_DISPLAY_YRES);
+
+	if (xres <= 960) {
+		// Smaller than the PSP*2, let's go native.
+		return 0;
+	} else if (xres <= 480 * 3) {  // 720p xres
+		// Small-ish screen, we should default to 2x
+		return 2 + 1;
+	} else {
+		// Large or very large screen. Default to 3x psp resolution.
+		return 3 + 1;
+	}
+	return 0;
+#else
+	return 1;
+#endif
+}
+
 // See issue 14439. Should possibly even block these devices from selecting VK.
 const char * const vulkanDefaultBlacklist[] = {
 	"Sony:BRAVIA VH1",
@@ -498,6 +526,7 @@ static const ConfigSetting graphicsSettings[] = {
 	ConfigSetting("SoftwareSkinning", &g_Config.bSoftwareSkinning, true, CfgFlag::PER_GAME | CfgFlag::REPORT),
 	ConfigSetting("TextureFiltering", &g_Config.iTexFiltering, 1, CfgFlag::PER_GAME | CfgFlag::REPORT),
 	ConfigSetting("InternalResolution", &g_Config.iInternalResolution, &DefaultInternalResolution, CfgFlag::PER_GAME | CfgFlag::REPORT),
+	ConfigSetting("AndroidHwScale", &g_Config.iAndroidHwScale, &DefaultAndroidHwScale, CfgFlag::DEFAULT),
 	ConfigSetting("HighQualityDepth", &g_Config.bHighQualityDepth, true, CfgFlag::PER_GAME | CfgFlag::REPORT),
 	ConfigSetting("FrameSkip", &g_Config.iFrameSkip, 0, CfgFlag::PER_GAME | CfgFlag::REPORT),
 	ConfigSetting("FrameSkipType", &g_Config.iFrameSkipType, 0, CfgFlag::PER_GAME | CfgFlag::REPORT),

Core/Config.h

@@ -398,6 +398,9 @@ struct Config {
 
 	bool bSystemControls;
 
+	// Use the hardware scaler to scale up the image to save fillrate. Similar to Windows' window size, really.
+	int iAndroidHwScale;  // 0 = device resolution. 1 = 480x272 (extended to correct aspect), 2 = 960x544 etc.
+
 	// Risky JIT optimizations
 	bool bDiscardRegsOnJRRA;
 

UI/ControlMappingScreen.cpp

@@ -772,6 +772,9 @@ void RecreateActivity() {
 
 UI::EventReturn TouchTestScreen::OnImmersiveModeChange(UI::EventParams &e) {
 	System_Notify(SystemNotification::IMMERSIVE_MODE_CHANGE);
+	if (g_Config.iAndroidHwScale != 0) {
+		RecreateActivity();
+	}
 	return UI::EVENT_DONE;
 }
 

UI/GameSettingsScreen.cpp

@@ -368,6 +368,18 @@ void GameSettingsScreen::CreateGraphicsSettings(UI::ViewGroup *graphicsSettings)
 		}
 	}
 
+#if PPSSPP_PLATFORM(ANDROID)
+	if ((deviceType != DEVICE_TYPE_TV) && (deviceType != DEVICE_TYPE_VR)) {
+		static const char *deviceResolutions[] = { "Native device resolution", "Auto (same as Rendering)", "1x PSP", "2x PSP", "3x PSP", "4x PSP", "5x PSP" };
+		int max_res_temp = std::max(System_GetPropertyInt(SYSPROP_DISPLAY_XRES), System_GetPropertyInt(SYSPROP_DISPLAY_YRES)) / 480 + 2;
+		if (max_res_temp == 3)
+			max_res_temp = 4;  // At least allow 2x
+		int max_res = std::min(max_res_temp, (int)ARRAY_SIZE(deviceResolutions));
+		UI::PopupMultiChoice *hwscale = graphicsSettings->Add(new PopupMultiChoice(&g_Config.iAndroidHwScale, gr->T("Display Resolution (HW scaler)"), deviceResolutions, 0, max_res, I18NCat::GRAPHICS, screenManager()));
+		hwscale->OnChoice.Handle(this, &GameSettingsScreen::OnHwScaleChange);  // To refresh the display mode
+	}
+#endif
+
 	if (deviceType != DEVICE_TYPE_VR) {
 #if !defined(MOBILE_DEVICE)
 		graphicsSettings->Add(new CheckBox(&g_Config.bFullScreen, gr->T("FullScreen", "Full Screen")))->OnClick.Handle(this, &GameSettingsScreen::OnFullscreenChange);
@@ -1206,6 +1218,9 @@ UI::EventReturn GameSettingsScreen::OnAdhocGuides(UI::EventParams &e) {
 
 UI::EventReturn GameSettingsScreen::OnImmersiveModeChange(UI::EventParams &e) {
 	System_Notify(SystemNotification::IMMERSIVE_MODE_CHANGE);
+	if (g_Config.iAndroidHwScale != 0) {
+		System_RecreateActivity();
+	}
 	return UI::EVENT_DONE;
 }
 
@@ -1327,11 +1342,19 @@ UI::EventReturn GameSettingsScreen::OnFullscreenMultiChange(UI::EventParams &e)
 }
 
 UI::EventReturn GameSettingsScreen::OnResolutionChange(UI::EventParams &e) {
+	if (g_Config.iAndroidHwScale == 1) {
+		System_RecreateActivity();
+	}
 	Reporting::UpdateConfig();
 	NativeMessageReceived("gpu_renderResized", "");
 	return UI::EVENT_DONE;
 }
 
+UI::EventReturn GameSettingsScreen::OnHwScaleChange(UI::EventParams &e) {
+	System_RecreateActivity();
+	return UI::EVENT_DONE;
+}
+
 void GameSettingsScreen::onFinish(DialogResult result) {
 	Reporting::Enable(enableReports_, "report.ppsspp.org");
 	Reporting::UpdateConfig();

UI/GameSettingsScreen.h

@@ -108,6 +108,7 @@ class GameSettingsScreen : public UIDialogScreenWithGameBackground {
 	UI::EventReturn OnFullscreenChange(UI::EventParams &e);
 	UI::EventReturn OnFullscreenMultiChange(UI::EventParams &e);
 	UI::EventReturn OnResolutionChange(UI::EventParams &e);
+	UI::EventReturn OnHwScaleChange(UI::EventParams &e);
 	UI::EventReturn OnRestoreDefaultSettings(UI::EventParams &e);
 	UI::EventReturn OnRenderingMode(UI::EventParams &e);
 	UI::EventReturn OnRenderingBackend(UI::EventParams &e);

UI/NativeApp.cpp

@@ -211,6 +211,22 @@ std::string NativeQueryConfig(std::string query) {
 		return std::string(temp);
 	} else if (query == "immersiveMode") {
 		return std::string(g_Config.bImmersiveMode ? "1" : "0");
+	} else if (query == "hwScale") {
+		int scale = g_Config.iAndroidHwScale;
+		// Override hw scale for TV type devices.
+		if (System_GetPropertyInt(SYSPROP_DEVICE_TYPE) == DEVICE_TYPE_TV)
+			scale = 0;
+
+		if (scale == 1) {
+			// If g_Config.iInternalResolution is also set to Auto (1), we fall back to "Device resolution" (0). It works out.
+			scale = g_Config.iInternalResolution;
+		} else if (scale >= 2) {
+			scale -= 1;
+		}
+
+		int max_res = std::max(System_GetPropertyInt(SYSPROP_DISPLAY_XRES), System_GetPropertyInt(SYSPROP_DISPLAY_YRES)) / 480 + 1;
+		snprintf(temp, sizeof(temp), "%d", std::min(scale, max_res));
+		return std::string(temp);
 	} else if (query == "sustainedPerformanceMode") {
 		return std::string(g_Config.bSustainedPerformanceMode ? "1" : "0");
 	} else if (query == "androidJavaGL") {

android/jni/app-android.cpp

@@ -1046,6 +1046,9 @@ bool System_MakeRequest(SystemRequestType type, int requestId, const std::string
 	case SystemRequestType::RESTART_APP:
 		PushCommand("graphics_restart", param1);
 		return true;
+	case SystemRequestType::RECREATE_ACTIVITY:
+		PushCommand("recreate", param1);
+		return true;
 	case SystemRequestType::INPUT_TEXT_MODAL:
 	{
 		std::string serialized = StringFromFormat("%d:@:%s:@:%s", requestId, param1.c_str(), param2.c_str());
@@ -1283,6 +1286,50 @@ extern "C" void JNICALL Java_org_ppsspp_ppsspp_NativeActivity_requestExitVulkanR
 	}
 }
 
+void correctRatio(int &sz_x, int &sz_y, float scale) {
+	float x = (float)sz_x;
+	float y = (float)sz_y;
+	float ratio = x / y;
+	INFO_LOG(G3D, "CorrectRatio: Considering size: %0.2f/%0.2f=%0.2f for scale %f", x, y, ratio, scale);
+	float targetRatio;
+
+	// Try to get the longest dimension to match scale*PSP resolution.
+	if (x >= y) {
+		targetRatio = 480.0f / 272.0f;
+		x = 480.f * scale;
+		y = 272.f * scale;
+	} else {
+		targetRatio = 272.0f / 480.0f;
+		x = 272.0f * scale;
+		y = 480.0f * scale;
+	}
+
+	float correction = targetRatio / ratio;
+	INFO_LOG(G3D, "Target ratio: %0.2f ratio: %0.2f correction: %0.2f", targetRatio, ratio, correction);
+	if (ratio < targetRatio) {
+		y *= correction;
+	} else {
+		x /= correction;
+	}
+
+	sz_x = x;
+	sz_y = y;
+	INFO_LOG(G3D, "Corrected ratio: %dx%d", sz_x, sz_y);
+}
+
+void getDesiredBackbufferSize(int &sz_x, int &sz_y) {
+	sz_x = display_xres;
+	sz_y = display_yres;
+	std::string config = NativeQueryConfig("hwScale");
+	int scale;
+	if (1 == sscanf(config.c_str(), "%d", &scale) && scale > 0) {
+		correctRatio(sz_x, sz_y, scale);
+	} else {
+		sz_x = 0;
+		sz_y = 0;
+	}
+}
+
 extern "C" void JNICALL Java_org_ppsspp_ppsspp_NativeApp_setDisplayParameters(JNIEnv *, jclass, jint xres, jint yres, jint dpi, jfloat refreshRate) {
 	INFO_LOG(G3D, "NativeApp.setDisplayParameters(%d x %d, dpi=%d, refresh=%0.2f)", xres, yres, dpi, refreshRate);
 
@@ -1311,6 +1358,18 @@ extern "C" void JNICALL Java_org_ppsspp_ppsspp_NativeApp_setDisplayParameters(JN
 	}
 }
 
+extern "C" void JNICALL Java_org_ppsspp_ppsspp_NativeApp_computeDesiredBackbufferDimensions() {
+	getDesiredBackbufferSize(desiredBackbufferSizeX, desiredBackbufferSizeY);
+}
+
+extern "C" jint JNICALL Java_org_ppsspp_ppsspp_NativeApp_getDesiredBackbufferWidth(JNIEnv *, jclass) {
+	return desiredBackbufferSizeX;
+}
+
+extern "C" jint JNICALL Java_org_ppsspp_ppsspp_NativeApp_getDesiredBackbufferHeight(JNIEnv *, jclass) {
+	return desiredBackbufferSizeY;
+}
+
 std::vector<std::string> System_GetCameraDeviceList() {
 	jclass cameraClass = findClass("org/ppsspp/ppsspp/CameraHelper");
 	jmethodID deviceListMethod = getEnv()->GetStaticMethodID(cameraClass, "getDeviceList", "()Ljava/util/ArrayList;");

android/src/org/ppsspp/ppsspp/SizeManager.java

@@ -85,6 +85,11 @@ public void surfaceCreated(SurfaceHolder holder) {
 
 		Log.d(TAG, "Surface created. pixelWidth=" + pixelWidth + ", pixelHeight=" + pixelHeight + " holder: " + holder.toString() + " or: " + requestedOr);
 		NativeApp.setDisplayParameters(pixelWidth, pixelHeight, (int)densityDpi, refreshRate);
+		getDesiredBackbufferSize(desiredSize);
+
+		// Note that desiredSize might be 0,0 here - but that's fine when calling setFixedSize! It means auto.
+		Log.d(TAG, "Setting fixed size " + desiredSize.x + " x " + desiredSize.y);
+		holder.setFixedSize(desiredSize.x, desiredSize.y);
 	}
 
 	@Override