#if !RESOURCE_RELOADING

DXC_Result DXC_Compile(Arena *arena, String shader_source, i32 num_args, String *args)
{
    (UNUSED)arena;
    (UNUSED)shader_source;
    (UNUSED)num_args;
    (UNUSED)args;
    DXC_Result result = ZI;
    return result;
}

#else

#if CompilerIsClang
# pragma clang diagnostic ignored "-Wlanguage-extension-token"
#endif

////////////////////////////////
//~ Windows headers

#pragma warning(push, 0)
# define WIN32_LEAN_AND_MEAN
# define UNICODE
# include <Windows.h>
# include <atlbase.h>
# include <dxcapi.h>
# include <d3d12shader.h>
#pragma warning(pop)

#pragma comment(lib, "d3dcompiler")
#pragma comment(lib, "dxcompiler")

////////////////////////////////
//~ Compile

/* https://github.com/microsoft/DirectXShaderCompiler/wiki/Using-dxc.exe-and-dxcompiler.dll */
DXC_Result DXC_Compile(Arena *arena, String shader_source, i32 num_args, String *args)
{
    __prof;
    TempArena scratch = BeginScratch(arena);
    DXC_Result result = ZI;

    wchar_t **wstr_args = PushStructs(scratch.arena, wchar_t *, num_args);
    for (i32 i = 0; i < num_args; ++i) {
        wstr_args[i] = WstrFromString(scratch.arena, args[i]);
    }

    DxcBuffer dxc_src_buffer = ZI;
    dxc_src_buffer.Ptr = shader_source.text;
    dxc_src_buffer.Size = shader_source.len;
    dxc_src_buffer.Encoding = DXC_CP_UTF8;

    //- Init compiler
    CComPtr<IDxcUtils> dxc_utils;
    CComPtr<IDxcCompiler3> dxc_compiler;
    CComPtr<IDxcIncludeHandler> dxc_include_handler;
    DxcCreateInstance(CLSID_DxcUtils, IID_PPV_ARGS(&dxc_utils));
    DxcCreateInstance(CLSID_DxcCompiler, IID_PPV_ARGS(&dxc_compiler));
    dxc_utils->CreateDefaultIncludeHandler(&dxc_include_handler);

    //- Compile
    CComPtr<IDxcResult> compile_results = 0;
    dxc_compiler->Compile(&dxc_src_buffer, (LPCWSTR *)wstr_args, (u32)num_args, dxc_include_handler, IID_PPV_ARGS(&compile_results));

    //- Copy errors
    CComPtr<IDxcBlobUtf8> dxc_errors = 0;
    compile_results->GetOutput(DXC_OUT_ERRORS, IID_PPV_ARGS(&dxc_errors), 0);
    if (dxc_errors != 0) {
        String blob_str = ZI;
        blob_str.len = dxc_errors->GetBufferSize();
        blob_str.text = (u8 *)dxc_errors->GetBufferPointer();
        result.errors = CopyString(arena, blob_str);
    }

    //- Get status
    HRESULT dxc_hr = 0;
    compile_results->GetStatus(&dxc_hr);
    result.success = SUCCEEDED(dxc_hr);

    //- Copy shader output
    if (result.success) {
        CComPtr<IDxcBlob> dxc_shader = 0;
        compile_results->GetOutput(DXC_OUT_OBJECT, IID_PPV_ARGS(&dxc_shader), 0);
        if (dxc_shader != 0) {
            String blob_str = ZI;
            blob_str.len = dxc_shader->GetBufferSize();
            blob_str.text = (u8 *)dxc_shader->GetBufferPointer();
            result.dxc = CopyString(arena, blob_str);
        }
    }

    EndScratch(scratch);
    return result;
}

#endif