From ce14cc8677b6d885a5f6c1a372a552f6ce2263e4 Mon Sep 17 00:00:00 2001
From: Thomas Harte <thomas.harte@gmail.com>
Date: Sun, 5 Aug 2018 17:36:01 -0400
Subject: [PATCH] Flips meaning of analogue input bits, correcting most
 joystick titles.

Mysteriously, some functioned correctly before this. But they continue to do so.
---
 Machines/AppleII/AppleII.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Machines/AppleII/AppleII.cpp b/Machines/AppleII/AppleII.cpp
index c8228009e..28dee33a1 100644
--- a/Machines/AppleII/AppleII.cpp
+++ b/Machines/AppleII/AppleII.cpp
@@ -289,7 +289,7 @@ template <bool is_iie> class ConcreteMachine:
 
 		std::vector<std::unique_ptr<Inputs::Joystick>> joysticks_;
 		bool analogue_channel_is_discharged(size_t channel) {
-			return static_cast<Joystick *>(joysticks_[channel >> 1].get())->axes[channel & 1] < analogue_charge_ + analogue_biases_[channel];
+			return (1.0f - static_cast<Joystick *>(joysticks_[channel >> 1].get())->axes[channel & 1]) < analogue_charge_ + analogue_biases_[channel];
 		}
 
 		// The IIe has three keys that are wired directly to the same input as the joystick buttons.
@@ -492,7 +492,7 @@ template <bool is_iie> class ConcreteMachine:
 								case 0xc067: {	// Analogue input 3.
 									const size_t input = address - 0xc064;
 									*value &= 0x7f;
-									if(analogue_channel_is_discharged(input)) {
+									if(!analogue_channel_is_discharged(input)) {
 										*value |= 0x80;
 									}
 								} break;