chore : Fix vulkan related compiler warnings, add help text, improve CLI options (#8477)

* chore: Fix compiler warnings, add help text, improve CLI options

* Add prototypes for function definitions
* Invert logic of --no-clean option to be more intuitive
* Provide a new help prompt with clear instructions

* chore : Add ignore rule for vulkan shader generator

Signed-off-by: teleprint-me <77757836+teleprint-me@users.noreply.github.com>

* Update ggml/src/vulkan-shaders/vulkan-shaders-gen.cpp

Co-authored-by: 0cc4m <picard12@live.de>

* chore : Remove void and apply C++ style empty parameters

* chore : Remove void and apply C++ style empty parameters

---------

Signed-off-by: teleprint-me <77757836+teleprint-me@users.noreply.github.com>
Co-authored-by: 0cc4m <picard12@live.de>

.gitignore

@@ -50,6 +50,7 @@ build*
 !docs/build.md
 /libllama.so
 /llama-*
+/vulkan-shaders-gen
 android-ndk-*
 arm_neon.h
 cmake-build-*

ggml/src/vulkan-shaders/vulkan-shaders-gen.cpp

@@ -30,6 +30,20 @@
 
 #define ASYNCIO_CONCURRENCY 64
 
+// define prototypes
+void execute_command(const std::string& command, std::string& stdout_str, std::string& stderr_str);
+bool directory_exists(const std::string& path);
+bool create_directory(const std::string& path);
+std::string to_uppercase(const std::string& input);
+bool string_ends_with(const std::string& str, const std::string& suffix);
+std::string join_paths(const std::string& path1, const std::string& path2);
+std::string basename(const std::string &path);
+void string_to_spv(const std::string& _name, const std::string& in_fname, const std::map<std::string, std::string>& defines, bool fp16);
+std::map<std::string, std::string> merge_maps(const std::map<std::string, std::string>& a, const std::map<std::string, std::string>& b);
+void matmul_shaders(std::vector<std::future<void>>& tasks, bool fp16, bool matmul_id);
+void process_shaders(std::vector<std::future<void>>& tasks);
+void write_output_files();
+
 std::mutex lock;
 std::vector<std::pair<std::string, std::string>> shader_fnames;
 
@@ -38,7 +52,7 @@ std::string input_dir = "vulkan-shaders";
 std::string output_dir = "/tmp";
 std::string target_hpp = "ggml-vulkan-shaders.hpp";
 std::string target_cpp = "ggml-vulkan-shaders.cpp";
-bool no_clean = false;
+bool clean = true;
 
 const std::vector<std::string> type_names = {
     "f32",
@@ -464,8 +478,9 @@ void write_output_files() {
         }
         fprintf(src, "\n};\n\n");
 
-        if (!no_clean) {
+        if (clean) {
             std::remove(path.c_str());
+            // fprintf(stderr, "Removed: %s\n", path.c_str());
         }
     }
 
@@ -481,6 +496,18 @@ int main(int argc, char** argv) {
         }
     }
 
+    if (argc <= 1 || args.find("--help") != args.end()) {
+        std::cout << "Usage:\n"
+                     "\tvulkan-shaders-gen [options]\n\n"
+                     "Options:\n"
+                     "\t--glslc <path>        Path to glslc executable (default: /usr/bin/glslc)\n"
+                     "\t--input-dir           Directory containing shader sources (required)\n"
+                     "\t--output-dir          Output directory for generated SPIR-V files and optional C++ headers\n"
+                     "\t--target-hpp <path>   Path to generate a header file with shader declarations in C++ format\n"
+                     "\t--target-cpp <path>   Path to generate a source code file implementing the declared shaders (optional)\n"
+                     "\t--no-clean            Keep temporary SPIR-V files after build (default: remove them)\n";
+        return EXIT_SUCCESS;
+    }
     if (args.find("--glslc") != args.end()) {
         GLSLC = args["--glslc"]; // Path to glslc
     }
@@ -497,7 +524,7 @@ int main(int argc, char** argv) {
         target_cpp = args["--target-cpp"]; // Path to generated cpp file
     }
     if (args.find("--no-clean") != args.end()) {
-        no_clean = true; // Keep temporary SPIR-V files in output-dir after build
+        clean = false; // Keep temporary SPIR-V files in output-dir after build
     }
 
     if (!directory_exists(input_dir)) {