From 5450646b5c338d01123f8cdd740f91bf6ed357de Mon Sep 17 00:00:00 2001
From: Flyinghead <raphael.jean@gmail.com>
Date: Fri, 4 Oct 2024 16:45:28 +0200
Subject: [PATCH] android: add virtual gamepad transparency setting

Issue #384
---
 core/cfg/option.cpp | 1 +
 core/cfg/option.h   | 1 +
 core/rend/osd.cpp   | 7 +++++--
 core/ui/gui.cpp     | 2 ++
 4 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/core/cfg/option.cpp b/core/cfg/option.cpp
index b3bd2e5ad..cc5070642 100644
--- a/core/cfg/option.cpp
+++ b/core/cfg/option.cpp
@@ -168,6 +168,7 @@ Option<bool> OmxAudioHdmi("audio_hdmi", true, "omx");
 
 Option<int> MouseSensitivity("MouseSensitivity", 100, "input");
 Option<int> VirtualGamepadVibration("VirtualGamepadVibration", 20, "input");
+Option<int> VirtualGamepadTransparency("VirtualGamepadTransparency", 37, "input");
 
 std::array<Option<MapleDeviceType>, 4> MapleMainDevices {
 	Option<MapleDeviceType>("device1", MDT_SegaController, "input"),
diff --git a/core/cfg/option.h b/core/cfg/option.h
index c5ecd239b..4d1f283f7 100644
--- a/core/cfg/option.h
+++ b/core/cfg/option.h
@@ -534,6 +534,7 @@ extern Option<bool> OmxAudioHdmi;
 
 extern Option<int> MouseSensitivity;
 extern Option<int> VirtualGamepadVibration;
+extern Option<int> VirtualGamepadTransparency;
 extern std::array<Option<MapleDeviceType>, 4> MapleMainDevices;
 extern std::array<std::array<Option<MapleDeviceType>, 2>, 4> MapleExpansionDevices;
 extern Option<bool> PerGameVmu;
diff --git a/core/rend/osd.cpp b/core/rend/osd.cpp
index 9722b92f4..b10c5493c 100644
--- a/core/rend/osd.cpp
+++ b/core/rend/osd.cpp
@@ -26,10 +26,12 @@
 
 #include <stb_image.h>
 
+#ifndef LIBRETRO
+
 #define OSD_TEX_W 512
 #define OSD_TEX_H 256
 
-#if defined(__ANDROID__) && !defined(LIBRETRO)
+#ifdef __ANDROID__
 extern float vjoy_pos[15][8];
 #else
 
@@ -74,7 +76,7 @@ static void DrawButton(const float xy[8], u32 state)
 	OSDVertex vtx;
 
 	vtx.r = vtx.g = vtx.b = (0x7F - 0x40 * state / 255) * vjoy_pos[VJOY_VISIBLE][0];
-	vtx.a = 0xA0 * vjoy_pos[VJOY_VISIBLE][4];
+	vtx.a = (100 - config::VirtualGamepadTransparency) * 0xff / 100 * vjoy_pos[VJOY_VISIBLE][4];
 	vjoy_pos[VJOY_VISIBLE][4] += (vjoy_pos[VJOY_VISIBLE][0] - vjoy_pos[VJOY_VISIBLE][4]) / 2;
 
 	vtx.x = xy[0]; vtx.y = xy[1];
@@ -172,6 +174,7 @@ u8 *loadOSDButtons(int &width, int &height)
 	}
 	return image_data;
 }
+#endif	// LIBRETRO
 
 u32 vmu_lcd_data[8][48 * 32];
 bool vmu_lcd_status[8];
diff --git a/core/ui/gui.cpp b/core/ui/gui.cpp
index 194cd813c..fa270de2d 100644
--- a/core/ui/gui.cpp
+++ b/core/ui/gui.cpp
@@ -1442,6 +1442,8 @@ static void gamepadSettingsPopup(const std::shared_ptr<GamepadDevice>& gamepad)
 		{
 			header("Haptic");
 			OptionSlider("Power", config::VirtualGamepadVibration, 0, 100, "Haptic feedback power", "%d%%");
+			header("View");
+			OptionSlider("Transparency", config::VirtualGamepadTransparency, 0, 100, "Virtual gamepad buttons transparency", "%d%%");
 		}
 		else if (gamepad->is_rumble_enabled())
 		{