Fog: Make fraction of visible distance at which fog starts configurable

Optimise the fetching of global settings 'camera_smoothing',
'cinematic' and 'cinematic_camera_smoothing'.
Cache 'cam_smoothing'.

3 files changed, 33 insertions, 9 deletions

diff --git a/src/defaultsettings.cpp b/src/defaultsettings.cpp
index 2cb57532d..bd88cf530 100644
--- a/src/defaultsettings.cpp
+++ b/src/defaultsettings.cpp
@@ -106,6 +106,7 @@ void set_default_settings(Settings *settings)
 	settings->setDefault("client_unload_unused_data_timeout", "600");
 	settings->setDefault("client_mapblock_limit", "5000");
 	settings->setDefault("enable_fog", "true");
+	settings->setDefault("fog_start", "0.4");
 	settings->setDefault("fov", "72");
 	settings->setDefault("view_bobbing", "true");
 	settings->setDefault("leaves_style", "fancy");
diff --git a/src/game.cpp b/src/game.cpp
index e6d38d0a0..cc6e5a0e3 100644
--- a/src/game.cpp
+++ b/src/game.cpp
@@ -1825,6 +1825,8 @@ private:
 	f32  m_cache_mouse_sensitivity;
 	f32  m_cache_joystick_frustum_sensitivity;
 	f32  m_repeat_right_click_time;
+	f32  m_cache_cam_smoothing;
+	f32  m_cache_fog_start;
 
 #ifdef __ANDROID__
 	bool m_cache_hold_aux1;
@@ -1876,6 +1878,12 @@ Game::Game() :
 		&settingChangedCallback, this);
 	g_settings->registerChangedCallback("free_move",
 		&settingChangedCallback, this);
+	g_settings->registerChangedCallback("cinematic",
+		&settingChangedCallback, this);
+	g_settings->registerChangedCallback("cinematic_camera_smoothing",
+		&settingChangedCallback, this);
+	g_settings->registerChangedCallback("camera_smoothing",
+		&settingChangedCallback, this);
 
 	readSettings();
 
@@ -1929,6 +1937,12 @@ Game::~Game()
 		&settingChangedCallback, this);
 	g_settings->deregisterChangedCallback("free_move",
 		&settingChangedCallback, this);
+	g_settings->deregisterChangedCallback("cinematic",
+		&settingChangedCallback, this);
+	g_settings->deregisterChangedCallback("cinematic_camera_smoothing",
+		&settingChangedCallback, this);
+	g_settings->deregisterChangedCallback("camera_smoothing",
+		&settingChangedCallback, this);
 }
 
 bool Game::startup(bool *kill,
@@ -2034,16 +2048,10 @@ void Game::run()
 		processUserInput(&flags, &runData, dtime);
 		// Update camera before player movement to avoid camera lag of one frame
 		updateCameraDirection(&cam_view_target, &flags, dtime);
-		float cam_smoothing = 0;
-		if (g_settings->getBool("cinematic"))
-			cam_smoothing = 1 - g_settings->getFloat("cinematic_camera_smoothing");
-		else
-			cam_smoothing = 1 - g_settings->getFloat("camera_smoothing");
-		cam_smoothing = rangelim(cam_smoothing, 0.01f, 1.0f);
 		cam_view.camera_yaw += (cam_view_target.camera_yaw -
-				cam_view.camera_yaw) * cam_smoothing;
+				cam_view.camera_yaw) * m_cache_cam_smoothing;
 		cam_view.camera_pitch += (cam_view_target.camera_pitch -
-				cam_view.camera_pitch) * cam_smoothing;
+				cam_view.camera_pitch) * m_cache_cam_smoothing;
 		updatePlayerControl(cam_view);
 		step(&dtime);
 		processClientEvents(&cam_view_target, &runData.damage_flash);
@@ -4284,7 +4292,7 @@ void Game::updateFrame(ProfilerGraph *graph, RunStats *stats,
 		driver->setFog(
 				sky->getBgColor(),
 				video::EFT_FOG_LINEAR,
-				runData->fog_range * 0.4,
+				runData->fog_range * m_cache_fog_start,
 				runData->fog_range * 1.0,
 				0.01,
 				false, // pixel fog
@@ -4660,7 +4668,18 @@ void Game::readSettings()
 	m_cache_enable_noclip                = g_settings->getBool("noclip");
 	m_cache_enable_free_move             = g_settings->getBool("free_move");
 
+	m_cache_fog_start                    = g_settings->getFloat("fog_start");
+
+	m_cache_cam_smoothing = 0;
+	if (g_settings->getBool("cinematic"))
+		m_cache_cam_smoothing = 1 - g_settings->getFloat("cinematic_camera_smoothing");
+	else
+		m_cache_cam_smoothing = 1 - g_settings->getFloat("camera_smoothing");
+
+	m_cache_fog_start = rangelim(m_cache_fog_start, 0.0f, 0.99f);
+	m_cache_cam_smoothing = rangelim(m_cache_cam_smoothing, 0.01f, 1.0f);
 	m_cache_mouse_sensitivity = rangelim(m_cache_mouse_sensitivity, 0.001, 100.0);
+
 }
 
 /****************************************************************************/
diff --git a/src/shader.cpp b/src/shader.cpp
index d51c1e308..c0ecf738d 100644
--- a/src/shader.cpp
+++ b/src/shader.cpp
@@ -751,6 +751,10 @@ ShaderInfo generate_shader(std::string name, u8 material_type, u8 drawtype,
 	if (g_settings->getBool("tone_mapping"))
 		shaders_header += "#define ENABLE_TONE_MAPPING\n";
 
+	shaders_header += "#define FOG_START ";
+	shaders_header += ftos(rangelim(g_settings->getFloat("fog_start"), 0.0f, 0.99f));
+	shaders_header += "\n";
+
 	// Call addHighLevelShaderMaterial() or addShaderMaterial()
 	const c8* vertex_program_ptr = 0;
 	const c8* pixel_program_ptr = 0;