SDL: Translate conditional effect direction instead of hardcoding it to 0 (c6c74)

SDL Commits
1 
From c6c7469708e5dc9f265cf359fc0a8982b448544e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tomasz=20Paku=C5=82a?= <[EMAIL REDACTED]>
Date: Mon, 20 Jan 2025 23:15:42 +0100
Subject: [PATCH] Translate conditional effect direction instead of hardcoding
 it to 0

Provious code wrongly assumed that direction is not an important part
of conditional effect. Moreover, if there's need to hardcode polar
direction, the default should be 0x4000 (north).

For one axis affects, a direction of 0 means complete lack of force, if
a FFB-enabled device takes direction into force calculation. A sine function
graph can be used to represent the resulting forces where X is the input
direction and Y is the force multiplier (360 degrees equals to 1).

This fixes conditional effect playback on Moza Racing devices, which do
not ignore direction field.
---
 include/SDL3/SDL_haptic.h        | 2 +-
 src/haptic/linux/SDL_syshaptic.c | 4 +++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/include/SDL3/SDL_haptic.h b/include/SDL3/SDL_haptic.h
index bb6d606551670..84f8c0c4f7695 100644
--- a/include/SDL3/SDL_haptic.h
+++ b/include/SDL3/SDL_haptic.h
@@ -710,7 +710,7 @@ typedef struct SDL_HapticCondition
     /* Header */
     Uint16 type;            /**< SDL_HAPTIC_SPRING, SDL_HAPTIC_DAMPER,
                                  SDL_HAPTIC_INERTIA or SDL_HAPTIC_FRICTION */
-    SDL_HapticDirection direction;  /**< Direction of the effect - Not used ATM. */
+    SDL_HapticDirection direction;  /**< Direction of the effect. */
 
     /* Replay */
     Uint32 length;          /**< Duration of the effect. */
diff --git a/src/haptic/linux/SDL_syshaptic.c b/src/haptic/linux/SDL_syshaptic.c
index 1e38b9aabf4b9..c9775d2eba0a6 100644
--- a/src/haptic/linux/SDL_syshaptic.c
+++ b/src/haptic/linux/SDL_syshaptic.c
@@ -824,7 +824,9 @@ static bool SDL_SYS_ToFFEffect(struct ff_effect *dest, const SDL_HapticEffect *s
             dest->type = FF_FRICTION;
         }
 
-        dest->direction = 0; // Handled by the condition-specifics.
+        if (!SDL_SYS_ToDirection(&dest->direction, &condition->direction)) {
+            return false;
+        }
 
         // Replay
         dest->replay.length = (condition->length == SDL_HAPTIC_INFINITY) ? 0 : CLAMP(condition->length);