From 51afc2c2910d6f7c1f2dee9c90f54729d3c3d940 Mon Sep 17 00:00:00 2001
From: fazzi <18248986+fxzzi@users.noreply.github.com>
Date: Fri, 18 Apr 2025 20:44:54 +0100
Subject: ctm: enable fade animation on nvidia driver versions 575 and above
 (#10095)

* ctm: enable fade animation on nvidia driver versions 575 and above

* format if statement without braces; handle potential throw when checking for nvidia version file
---
 src/helpers/MiscFunctions.cpp | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

(limited to 'src/helpers/MiscFunctions.cpp')

diff --git a/src/helpers/MiscFunctions.cpp b/src/helpers/MiscFunctions.cpp
index 9e398fd9..88af38c7 100644
--- a/src/helpers/MiscFunctions.cpp
+++ b/src/helpers/MiscFunctions.cpp
@@ -817,3 +817,38 @@ float stringToPercentage(const std::string& VALUE, const float REL) {
     else
         return std::stof(VALUE);
 }
+
+// Checks if Nvidia driver major version is at least given version.
+// Useful for explicit_sync_kms and ctm_animation as they only work
+// past certain driver versions.
+bool isNvidiaDriverVersionAtLeast(int threshold) {
+    static int  driverMajor = 0;
+    static bool once        = true;
+
+    if (once) {
+        once = false;
+
+        std::error_code ec;
+        if (std::filesystem::exists("/sys/module/nvidia_drm/version", ec) && !ec) {
+            std::ifstream ifs("/sys/module/nvidia_drm/version");
+            if (ifs.good()) {
+                try {
+                    std::string driverInfo((std::istreambuf_iterator<char>(ifs)), (std::istreambuf_iterator<char>()));
+
+                    size_t      firstDot = driverInfo.find('.');
+                    if (firstDot != std::string::npos)
+                        driverMajor = std::stoi(driverInfo.substr(0, firstDot));
+
+                    Debug::log(LOG, "Parsed NVIDIA major version: {}", driverMajor);
+
+                } catch (std::exception& e) {
+                    driverMajor = 0; // Default to 0 if parsing fails
+                }
+
+                ifs.close();
+            }
+        }
+    }
+
+    return driverMajor >= threshold;
+}
-- 
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