Proper fog disabling with and without shaders (#227)

client/shaders/nodes_shader/opengl_fragment.glsl

@@ -3,6 +3,7 @@ uniform sampler2D normalTexture;
 uniform sampler2D textureFlags;
 
 uniform vec4 skyBgColor;
+uniform mediump float fogDistance;
 uniform vec3 eyePosition;
 
 varying mediump vec4 varColor;
@@ -73,9 +74,11 @@ void main(void)
 	// As additions usually come for free following a multiplication, the new formula
 	// should be more efficient as well.
 	// Note: clarity = (1 - fogginess)
+	if (fogDistance > 0.0) { // -1.0 means disabled
 		float clarity = clamp(fogShadingParameter
 			- fogShadingParameter * length(eyeVec), 0.0, 1.0);
 		col = mix(skyBgColor, col, clarity);
+	}
 	col = vec4(col.rgb, base.a);
 
 	gl_FragColor = col;

client/shaders/nodes_shader/opengl_vertex.glsl

@@ -1,7 +1,7 @@
 // Color of the light emitted by the sun.
 uniform highp mat4 mWorld;
 uniform vec3 dayLight;
-uniform float fogDistance;
+uniform mediump float fogDistance;
 uniform float animationTimer;
 
 varying mediump vec4 varColor;

client/shaders/wielded_shader/opengl_fragment.glsl

@@ -40,9 +40,11 @@ void main(void)
 	// As additions usually come for free following a multiplication, the new formula
 	// should be more efficient as well.
 	// Note: clarity = (1 - fogginess)
+	if (fogDistance > 0.0) { // -1.0 means disabled
 		float clarity = clamp(fogShadingParameter
 			- fogShadingParameter * length(eyeVec) / fogDistance, 0.0, 1.0);
 		col = mix(skyBgColor, col, clarity);
+	}
 
 	gl_FragColor = vec4(col.rgb, base.a);
 }

src/drawscene.cpp

@@ -60,7 +60,7 @@ void draw_anaglyph_3d_mode(Camera& camera, bool show_hud, Hud& hud,
 	//clear the depth buffer, and color
 	driver->beginScene( true, true, irr::video::SColor(0, 200, 200, 255));
 	driver->getOverrideMaterial().Material.ColorMask = irr::video::ECP_RED;
-	driver->getOverrideMaterial().EnableFlags = irr::video::EMF_COLOR_MASK;
+	driver->getOverrideMaterial().EnableFlags |= irr::video::EMF_COLOR_MASK;
 	driver->getOverrideMaterial().EnablePasses = irr::scene::ESNRP_SKY_BOX
 			+ irr::scene::ESNRP_SOLID + irr::scene::ESNRP_TRANSPARENT
 			+ irr::scene::ESNRP_TRANSPARENT_EFFECT + irr::scene::ESNRP_SHADOW;
@@ -88,7 +88,7 @@ void draw_anaglyph_3d_mode(Camera& camera, bool show_hud, Hud& hud,
 	driver->clearZBuffer();
 	driver->getOverrideMaterial().Material.ColorMask = irr::video::ECP_GREEN
 			+ irr::video::ECP_BLUE;
-	driver->getOverrideMaterial().EnableFlags = irr::video::EMF_COLOR_MASK;
+	driver->getOverrideMaterial().EnableFlags |= irr::video::EMF_COLOR_MASK;
 	driver->getOverrideMaterial().EnablePasses = irr::scene::ESNRP_SKY_BOX
 			+ irr::scene::ESNRP_SOLID + irr::scene::ESNRP_TRANSPARENT
 			+ irr::scene::ESNRP_TRANSPARENT_EFFECT + irr::scene::ESNRP_SHADOW;

src/game.cpp

@@ -698,7 +698,7 @@ public:
 		m_sky_bg_color.set(bgcolorfa, services);
 
 		// Fog distance
-		float fog_distance = 10000 * BS;
+		float fog_distance = -1.0f; // sentinel for disabled fog
 
 		if (m_fog_enabled && !*m_force_fog_off)
 			fog_distance = *m_fog_range;
@@ -1164,6 +1164,7 @@ struct GameRunData {
 	bool left_punch;
 	bool update_wielded_item_trigger;
 	bool reset_jump_timer;
+	bool disable_fog;
 	float nodig_delay_timer;
 	float noplace_delay_timer;
 	float dig_time;
@@ -1961,7 +1962,7 @@ bool Game::createClient(const std::string &playername,
 	#endif
 
 	GameGlobalShaderConstantSetterFactory *scsf = new GameGlobalShaderConstantSetterFactory(
-			&flags.force_fog_off, &runData.fog_range, client);
+			&runData.disable_fog, &runData.fog_range, client);
 	shader_src->addShaderConstantSetterFactory(scsf);
 
 	// Update cached textures, meshes and materials
@@ -4188,15 +4189,8 @@ void Game::updateFrame(ProfilerGraph *graph, RunStats *stats, f32 dtime,
 		Fog range
 	*/
 
-	if (draw_control->range_all) {
+	runData.disable_fog = !m_cache_enable_fog || flags.force_fog_off || draw_control->range_all;
-		#if defined(__ANDROID__) || defined(__IOS__)
-			runData.fog_range = draw_control->wanted_range * 4 * BS;
-		#else
-			runData.fog_range = 100000 * BS;
-		#endif
-	} else {
 	runData.fog_range = draw_control->wanted_range * BS;
-	}
 
 	/*
 		Calculate general brightness
@@ -4267,7 +4261,6 @@ void Game::updateFrame(ProfilerGraph *graph, RunStats *stats, f32 dtime,
 		Fog
 	*/
 
-	if (m_cache_enable_fog && !flags.force_fog_off) {
 	driver->setFog(
 			sky->getBgColor(),
 			video::EFT_FOG_LINEAR,
@@ -4277,17 +4270,6 @@ void Game::updateFrame(ProfilerGraph *graph, RunStats *stats, f32 dtime,
 			false, // pixel fog
 			true // range fog
 	);
-	} else {
-		driver->setFog(
-				sky->getBgColor(),
-				video::EFT_FOG_LINEAR,
-				100000 * BS,
-				110000 * BS,
-				0.01,
-				false, // pixel fog
-				false // range fog
-		);
-	}
 
 	/*
 		Get chat messages from client
@@ -4378,10 +4360,21 @@ void Game::updateFrame(ProfilerGraph *graph, RunStats *stats, f32 dtime,
 	TimeTaker tt_draw("mainloop: draw");
 	driver->beginScene(true, true, skycolor);
 
+	if (runData.disable_fog) {
+		driver->getOverrideMaterial().reset();
+		driver->getOverrideMaterial().EnableFlags = video::EMF_FOG_ENABLE;
+		driver->getOverrideMaterial().EnablePasses = irr::scene::ESNRP_SKY_BOX
+				| irr::scene::ESNRP_SOLID | irr::scene::ESNRP_TRANSPARENT
+				| irr::scene::ESNRP_TRANSPARENT_EFFECT | irr::scene::ESNRP_SHADOW;
+	}
+
 	draw_scene(driver, smgr, *camera, *client, player, *hud, mapper,
 			guienv, screensize, skycolor, flags.show_hud,
 			flags.show_minimap);
 
+	driver->getOverrideMaterial().EnableFlags = 0;
+	driver->getOverrideMaterial().EnablePasses = 0;
+
 	/*
 		Profiler graph
 	*/