release: create v0.4.0

Author: dabrain34

CONTRIBUTING

@@ -118,6 +118,15 @@ Use this section for any extra context that doesn't fit elsewhere:
 
 PR titles and bodies are automatically validated via GitHub Actions. The check will fail if required sections are missing or incorrectly formatted.
 
+---
+
+## Release Process
+
+1. Update `Changelog.md` with the new version entry
+2. Update the version in `common/include/VkVSCommon.h`
+3. Create a tag (e.g. `v0.4.0`) and push it — GitHub will automatically create a release
+
+---
 
 ## Developer Certificate of Origin
 

Changelog.md

@@ -1,3 +1,12 @@
+v0.4.0:
+  - Add testing framework to run automated decode and encode conformance
+    tests across multiple GPU drivers and codecs
+  - Add GitHub issue and PR templates with body validation workflow
+  - Add contributing section with testing hardware requirements
+  - Improve error handling: VulkanVideoProcessor::Initialize returns VkResult
+  - Improve frame output error handling with result enum in VkVideoQueue
+  - Code cleanup and better C++ compliance across decoder and build system
+
 v0.3.9:
   - Add clang compiler support for Linux and Windows builds
   - Add -Wundef warning flag and fix undefined macro usage

common/include/VkVSCommon.h

@@ -9,8 +9,8 @@ extern "C" {
 
 // Version information
 #define VKVS_VERSION_MAJOR 0
-#define VKVS_VERSION_MINOR 3
-#define VKVS_VERSION_PATCH 9
+#define VKVS_VERSION_MINOR 4
+#define VKVS_VERSION_PATCH 0
 
 // Helper macros for version string construction (prefixed to avoid reserved identifier issues)
 #define VKVS_STRINGIFY(x) #x