add entity 'on_render' event

res/content/base/scripts/components/drop.lua

@@ -88,7 +88,7 @@ function on_trigger_exit(index, oid)
     end
 end
 
-function on_update()
+function on_render()
     if inair then
         local dt = time.delta();
 
@@ -100,6 +100,9 @@ function on_update()
         mat4.scale(matrix, scale, matrix)
         rig:set_matrix(0, matrix)
     end
+end
+
+function on_update()
     if target ~= -1 then
         local dir = vec3.sub({player.get_pos(target)}, tsf:get_pos())
         vec3.normalize(dir, dir)

res/modules/internal/stdcomp.lua

@@ -68,7 +68,7 @@ return {
         end
     end,
     update = function()
-        for id,entity in pairs(entities) do
+        for _,entity in pairs(entities) do
             for _, component in pairs(entity.components) do
                 local callback = component.on_update
                 if callback then
@@ -80,5 +80,19 @@ return {
                 end
             end
         end
+    end,
+    render = function()
+        for _,entity in pairs(entities) do
+            for _, component in pairs(entity.components) do
+                local callback = component.on_render
+                if callback then
+                    local result, err = pcall(callback)
+                    if err then
+                        --// TODO: replace with error logging
+                        print(err)
+                    end
+                end
+            end
+        end
     end
 }

src/logic/scripting/scripting.cpp

@@ -422,6 +422,13 @@ void scripting::on_entities_update() {
     lua::pop(L);
 }
 
+void scripting::on_entities_render() {
+    auto L = lua::get_main_thread();
+    lua::get_from(L, STDCOMP, "render", true);
+    lua::call_nothrow(L, 0, 0);
+    lua::pop(L);
+}
+
 void scripting::on_ui_open(
     UiDocument* layout,
     std::vector<dynamic::Value> args

src/logic/scripting/scripting.hpp

@@ -89,6 +89,7 @@ namespace scripting {
     bool on_entity_fall(const Entity& entity);
     bool on_entity_save(const Entity& entity);
     void on_entities_update();
+    void on_entities_render();
     void on_trigger_enter(const Entity& entity, size_t index, entityid_t oid);
     void on_trigger_exit(const Entity& entity, size_t index, entityid_t oid);
 

src/objects/Entities.cpp

@@ -311,12 +311,6 @@ void Entities::updatePhysics(float delta) {
 
 void Entities::update() {
     scripting::on_entities_update();
-    auto view = registry.view<Transform>();
-    for (auto [entity, transform] : view.each()) {
-        if (transform.dirty) {
-            transform.refresh();
-        }
-    }
 }
 
 void Entities::renderDebug(LineBatch& batch, const Frustum& frustum) {
@@ -343,8 +337,13 @@ void Entities::renderDebug(LineBatch& batch, const Frustum& frustum) {
 }
 
 void Entities::render(Assets* assets, ModelBatch& batch, const Frustum& frustum) {
+    scripting::on_entities_render();
+
     auto view = registry.view<Transform, rigging::Rig>();
     for (auto [entity, transform, rig] : view.each()) {
+        if (transform.dirty) {
+            transform.refresh();
+        }
         const auto& pos = transform.pos;
         const auto& size = transform.size;
         if (frustum.isBoxVisible(pos-size, pos+size)) {