From db4f49bbbab48367a513409c16dccba790308ee4 Mon Sep 17 00:00:00 2001
From: Richard Harris <richardjharris@gmail.com>
Date: Sun, 31 May 2026 17:38:57 +0000
Subject: [PATCH] Implement Direct mode support for Roccat Vulcan TKL (non-Pro)

---
 .../RoccatVulcanKeyboardController.cpp        | 26 ++++++++++++++++---
 .../RoccatVulcanKeyboardController.h          |  5 ++++
 2 files changed, 27 insertions(+), 4 deletions(-)

diff --git a/Controllers/RoccatController/RoccatVulcanKeyboardController/RoccatVulcanKeyboardController.cpp b/Controllers/RoccatController/RoccatVulcanKeyboardController/RoccatVulcanKeyboardController.cpp
index 3073fd268..576270024 100644
--- a/Controllers/RoccatController/RoccatVulcanKeyboardController/RoccatVulcanKeyboardController.cpp
+++ b/Controllers/RoccatController/RoccatVulcanKeyboardController/RoccatVulcanKeyboardController.cpp
@@ -86,9 +86,14 @@ device_info RoccatVulcanKeyboardController::InitDeviceInfo()
     buf[0] = report_id;
     hid_get_feature_report(dev_ctrl, buf, packet_length);
 
-    char version[5];
-    snprintf(version, 5, "%d.%02d", buf[2] / 100, buf[2] % 100);
+    /*-------------------------------------------------------------*\
+    | buf[2] is version e.g. 103 means v1.03                        |
+    \*-------------------------------------------------------------*/
+    dev_info.version_major = buf[2] / 100;
+    dev_info.version_minor = buf[2] % 100;
 
+    char version[5];
+    snprintf(version, 5, "%d.%02d", dev_info.version_major, dev_info.version_minor);
     dev_info.version = version;
 
     if(device_pid == ROCCAT_MAGMA_PID || device_pid == ROCCAT_MAGMA_MINI_PID)
@@ -116,6 +121,11 @@ device_info RoccatVulcanKeyboardController::GetDeviceInfo()
     return dev_info;
 }
 
+bool RoccatVulcanKeyboardController::IsBigEndianDirectMode()
+{
+    return (dev_info.version_major >= 1 && dev_info.version_minor >= 16);
+}
+
 void RoccatVulcanKeyboardController::EnableDirect(bool on_off_switch)
 {
     uint8_t* buf;
@@ -218,8 +228,16 @@ void RoccatVulcanKeyboardController::SendColors(std::vector<led_color> colors)
     }
     else
     {
-        bufs[0][3] = packet_length & 0xFF;
-        bufs[0][4] = (packet_length >> 8) & 0xFF;
+        if(IsBigEndianDirectMode())
+        {
+            bufs[0][3] = (packet_length >> 8) & 0xFF;
+            bufs[0][4] = packet_length & 0xFF;
+        }
+        else
+        {
+            bufs[0][3] = packet_length & 0xFF;
+            bufs[0][4] = (packet_length >> 8) & 0xFF;
+        }
     }
 
     unsigned int data_length_packet = 64 - header_length_first;
diff --git a/Controllers/RoccatController/RoccatVulcanKeyboardController/RoccatVulcanKeyboardController.h b/Controllers/RoccatController/RoccatVulcanKeyboardController/RoccatVulcanKeyboardController.h
index 485030e0e..a27135a0c 100644
--- a/Controllers/RoccatController/RoccatVulcanKeyboardController/RoccatVulcanKeyboardController.h
+++ b/Controllers/RoccatController/RoccatVulcanKeyboardController/RoccatVulcanKeyboardController.h
@@ -61,6 +61,8 @@ enum
 struct device_info
 {
     std::string     version;
+    int             version_major;
+    int             version_minor;
     int             layout_type;
 };
 
@@ -89,6 +91,7 @@ public:
     void            AwaitResponse(int ms);
     void            ClearResponses();
 
+
     uint16_t        device_pid;
 
 private:
@@ -97,4 +100,6 @@ private:
     device_info     dev_info;
     std::string     location;
     std::string     name;
+
+    bool            IsBigEndianDirectMode();
 };