From 93ae0c0a17b7eabb79736c333354650594aa3e38 Mon Sep 17 00:00:00 2001
From: astrofra <astrofra@gmail.com>
Date: Tue, 15 Aug 2023 07:56:06 +0200
Subject: [PATCH] Lua version of the DOF sample.

---
 scene_dof.lua | 57 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 57 insertions(+)
 create mode 100644 scene_dof.lua

diff --git a/scene_dof.lua b/scene_dof.lua
new file mode 100644
index 0000000..4e4b16a
--- /dev/null
+++ b/scene_dof.lua
@@ -0,0 +1,57 @@
+-- Toyota 2JZ-GTE Engine model by Serhii Denysenko (CGTrader: serhiidenysenko8256)
+-- URL : https://www.cgtrader.com/3d-models/vehicle/part/toyota-2jz-gte-engine-2932b715-2f42-4ecd-93ce-df9507c67ce8
+
+hg = require("harfang")
+math.randomseed(os.time())
+
+hg.InputInit()
+hg.WindowSystemInit()
+
+res_x, res_y = 1280, 720
+win = hg.RenderInit('AAA Scene', res_x, res_y, hg.RF_VSync | hg.RF_MSAA4X)
+
+pipeline = hg.CreateForwardPipeline()
+res = hg.PipelineResources()
+
+hg.AddAssetsFolder("resources_compiled")
+
+-- load scene
+scene = hg.Scene()
+hg.LoadSceneFromAssets("car_engine/engine.scn", scene, res, hg.GetForwardPipelineInfo())
+
+-- AAA pipeline
+pipeline_aaa_config = hg.ForwardPipelineAAAConfig()
+pipeline_aaa = hg.CreateForwardPipelineAAAFromAssets("core", pipeline_aaa_config, hg.BR_Equal, hg.BR_Equal)
+pipeline_aaa_config.sample_count = 1
+target_dof_focus_point = 3.5
+target_dof_focus_length = 2.0
+pipeline_aaa_config.dof_focus_point = target_dof_focus_point -- Distance to the focus point (in meters)
+pipeline_aaa_config.dof_focus_length = target_dof_focus_length -- Depth of field (in meters); smaller values result in a narrower focused area.
+
+-- main loop
+frame = 0
+
+while not hg.ReadKeyboard():Key(hg.K_Escape) and hg.IsWindowOpen(win) do
+	dt = hg.TickClock()
+
+	trs = scene:GetNode('engine_master'):GetTransform()
+	trs:SetRot(trs:GetRot() + hg.Vec3(0, hg.Deg(15) * hg.time_to_sec_f(dt), 0))
+
+	-- change DOF randomly
+	if frame % 250 == 0 then
+		target_dof_focus_point = math.random() + 2.5 -- random value between 2.5 and 3.5
+		target_dof_focus_length = math.random() * 1.5 + 0.5 -- random value between 0.5 and 2.0
+	end
+	
+	pipeline_aaa_config.dof_focus_point = hg.Lerp(pipeline_aaa_config.dof_focus_point, target_dof_focus_point, 0.1)
+	pipeline_aaa_config.dof_focus_length = hg.Lerp(pipeline_aaa_config.dof_focus_length, target_dof_focus_length, 0.1)
+
+	scene:Update(dt)
+	hg.SubmitSceneToPipeline(0, scene, hg.IntRect(0, 0, res_x, res_y), true, pipeline, res, pipeline_aaa, pipeline_aaa_config, frame)
+
+	frame = hg.Frame()
+	hg.UpdateWindow(win)
+end
+
+hg.RenderShutdown()
+hg.DestroyWindow(win)