improving GLSL_std450 support

ffi/module.zig

@@ -6,6 +6,20 @@ const Options = extern struct {
     use_simd_vectors_specializations: ffi.SpvCBool,
 };
 
+const ReflectionInfos = extern struct {
+    local_size_x: ffi.SpvCWord,
+    local_size_y: ffi.SpvCWord,
+    local_size_z: ffi.SpvCWord,
+
+    geometry_invocations: ffi.SpvCWord,
+    geometry_output_count: ffi.SpvCWord,
+    geometry_input: ffi.SpvCWord,
+    geometry_output: ffi.SpvCWord,
+
+    needs_derivatives: ffi.SpvCBool,
+    has_control_barriers: ffi.SpvCBool,
+};
+
 fn toCResult(err: spv.Module.ModuleError) ffi.Result {
     return switch (err) {
         spv.Module.ModuleError.InvalidSpirV => ffi.Result.InvalidSpirV,
@@ -40,3 +54,17 @@ export fn SpvDeinitModule(module: *spv.Module) callconv(.c) void {
     module.deinit(allocator);
     allocator.destroy(module);
 }
+
+export fn SpvModuleGetReflectionInfos(module: *spv.Module) callconv(.c) ReflectionInfos {
+    return .{
+        .local_size_x = module.reflection_infos.local_size_x,
+        .local_size_y = module.reflection_infos.local_size_y,
+        .local_size_z = module.reflection_infos.local_size_z,
+        .geometry_invocations = module.reflection_infos.geometry_invocations,
+        .geometry_output_count = module.reflection_infos.geometry_output_count,
+        .geometry_input = module.reflection_infos.geometry_input,
+        .geometry_output = module.reflection_infos.geometry_output,
+        .needs_derivatives = if (module.reflection_infos.needs_derivatives) 1 else 0,
+        .has_control_barriers = if (module.reflection_infos.has_control_barriers) 1 else 0,
+    };
+}