Shadow mapping render pass (#11244)

Co-authored-by: x2048 <codeforsmile@gmail.com>

1 files changed, 36 insertions, 1 deletions

diff --git a/src/client/game.cpp b/src/client/game.cpp
index eb1dbb5a3..d240ebc0f 100644
--- a/src/client/game.cpp
+++ b/src/client/game.cpp
@@ -738,6 +738,7 @@ protected:
 			const ItemStack &selected_item, const ItemStack &hand_item, f32 dtime);
 	void updateFrame(ProfilerGraph *graph, RunStats *stats, f32 dtime,
 			const CameraOrientation &cam);
+	void updateShadows();
 
 	// Misc
 	void limitFps(FpsControl *fps_timings, f32 *dtime);
@@ -3831,13 +3832,20 @@ void Game::updateFrame(ProfilerGraph *graph, RunStats *stats, f32 dtime,
 	*/
 	runData.update_draw_list_timer += dtime;
 
+	float update_draw_list_delta = 0.2f;
+	if (ShadowRenderer *shadow = RenderingEngine::get_shadow_renderer())
+		update_draw_list_delta = shadow->getUpdateDelta();
+
 	v3f camera_direction = camera->getDirection();
-	if (runData.update_draw_list_timer >= 0.2
+	if (runData.update_draw_list_timer >= update_draw_list_delta
 			|| runData.update_draw_list_last_cam_dir.getDistanceFrom(camera_direction) > 0.2
 			|| m_camera_offset_changed) {
+
 		runData.update_draw_list_timer = 0;
 		client->getEnv().getClientMap().updateDrawList();
 		runData.update_draw_list_last_cam_dir = camera_direction;
+
+		updateShadows();
 	}
 
 	m_game_ui->update(*stats, client, draw_control, cam, runData.pointed_old, gui_chat_console, dtime);
@@ -3968,7 +3976,34 @@ inline void Game::updateProfilerGraphs(ProfilerGraph *graph)
 	graph->put(values);
 }
 
+/****************************************************************************
+ * Shadows
+ *****************************************************************************/
+void Game::updateShadows()
+{
+	ShadowRenderer *shadow = RenderingEngine::get_shadow_renderer();
+	if (!shadow)
+		return;
+
+	float in_timeofday = fmod(runData.time_of_day_smooth, 1.0f);
+
+	float timeoftheday = fmod(getWickedTimeOfDay(in_timeofday) + 0.75f, 0.5f) + 0.25f;
+	const float offset_constant = 10000.0f;
+
+	v3f light(0.0f, 0.0f, -1.0f);
+	light.rotateXZBy(90);
+	light.rotateXYBy(timeoftheday * 360 - 90);
+	light.rotateYZBy(sky->getSkyBodyOrbitTilt());
 
+	v3f sun_pos = light * offset_constant;
+
+	if (shadow->getDirectionalLightCount() == 0)
+		shadow->addDirectionalLight();
+	shadow->getDirectionalLight().setDirection(sun_pos);
+	shadow->setTimeOfDay(in_timeofday);
+
+	shadow->getDirectionalLight().update_frustum(camera, client);
+}
 
 /****************************************************************************
  Misc