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feat: Add Windows-only terrain SVG export functionality via FFI with configurable rendering options.

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This commit is contained in:
Jacob Schmidt 2026-02-16 20:26:40 -06:00
parent 4d7e3520eb
commit 2dbcb98817
1 changed files with 8 additions and 32 deletions
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40
arma/server/extension/src/terrain.rs
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@ -12,19 +12,11 @@ mod windows_ffi {
#[link(name = "kernel32")]
unsafe extern "system" {
pub(super) fn GetModuleHandleA(lpModuleName: *const u8) -> *mut c_void;
pub(super) fn LoadLibraryA(lpLibFileName: *const u8) -> *mut c_void;
pub(super) fn GetProcAddress(hModule: *mut c_void, lpProcName: *const u8) -> *mut c_void;
}
/// Mangled C++ name for the ExportSVG function.
/// Format: `?ExportSVG@@YAXPEBD_N11111@Z` matches signature:
/// `void ExportSVG(const char*, bool, bool, bool, bool, bool, bool)`
pub(super) const EXPORT_SVG_PROC_NAME: &[u8] = b"?ExportSVG@@YAXPEBD_N11111@Z\0";
/// Name of the DLL containing the ExportSVG function.
/// Update this to match your actual DLL name.
pub(super) const TERRAIN_DLL_NAME: &[u8] = b"TerrainExport.dll\0";
pub(super) type FnExportSVG =
extern "system" fn(*const c_char, bool, bool, bool, bool, bool, bool) -> *const c_void;
}
@ -63,35 +55,20 @@ pub fn export_terrain_svg(
unsafe {
use windows_ffi::*;
// Try to get already loaded module, or load the DLL
let module = GetModuleHandleA(TERRAIN_DLL_NAME.as_ptr());
let module = if module.is_null() {
let loaded = LoadLibraryA(TERRAIN_DLL_NAME.as_ptr());
if loaded.is_null() {
return Err(format!(
"Failed to load DLL: {}",
std::str::from_utf8_unchecked(&TERRAIN_DLL_NAME[..TERRAIN_DLL_NAME.len() - 1])
));
}
loaded
} else {
module
};
// Get the ExportSVG function address
let export_svg_proc = GetProcAddress(module, EXPORT_SVG_PROC_NAME.as_ptr());
if export_svg_proc.is_null() {
return Err("Failed to find ExportSVG function in DLL".to_string());
let module = GetModuleHandleA(std::ptr::null());
if module.is_null() {
return Err("Failed to get game engine module handle".to_string());
}
// Convert to function pointer
let export_svg: FnExportSVG = std::mem::transmute(export_svg_proc);
let export_svg_proc = GetProcAddress(module, EXPORT_SVG_PROC_NAME.as_ptr());
if export_svg_proc.is_null() {
return Err("Failed to find ExportSVG function in game engine".to_string());
}
// Convert file path to C string
let export_svg: FnExportSVG = std::mem::transmute(export_svg_proc);
let file_path_cstr =
std::ffi::CString::new(file_path).map_err(|e| format!("Invalid file path: {}", e))?;
// Call the export function
export_svg(
file_path_cstr.as_ptr(),
draw_location_names,
@ -164,7 +141,6 @@ struct ExportSvgOptions {
/// ["terrain:exportSVG", [toJSON _options]] call forge_x_extension_fnc_extCall;
/// ```
fn export_svg(options_json: String) -> String {
// Parse options from JSON
let options: ExportSvgOptions = match serde_json::from_str(&options_json) {
Ok(opts) => opts,
Err(e) => {