Update volumetrics

builtin/settingtypes.txt

@@ -610,14 +610,15 @@ enable_auto_exposure (Enable Automatic Exposure) bool false
 #    Requires: shaders, enable_post_processing, enable_auto_exposure
 exposure_compensation (Exposure compensation) float 0.0 -1.0 1.0
 
-#   Set the gamma value.
+#   Set the post processing gamma value.
 #   Higher values give lower contrast and vice versa. 
 #   Range: from 1.0 to 5.0
+#   Default: 1.6
 #
 #   Requires: shaders, enable_post_processing, tone_mapping
 gamma (Gamma) float 1.6 1.0 5.0
 
-#   Apply color grading to make brighter colors warmer and darker colors cooler.
+#   Apply ASL CDL color grading to make brighter colors warmer and darker colors cooler.
 #
 #   Requires: shaders, enable_post_processing
 enable_color_grading (Color grading) bool false
@@ -674,10 +675,28 @@ bloom_strength_factor (Bloom Strength Factor) float 1.0 0.1 10.0
 #    Requires: shaders, enable_post_processing, enable_bloom
 bloom_radius (Bloom Radius) float 1 0.1 8
 
+[**Volumetric Effects]
+
 #    Set to true to enable volumetric lighting effect (a.k.a. "Godrays").
 #
 #    Requires: shaders, enable_post_processing, enable_bloom
-enable_volumetric_lighting (Volumetric lighting) bool false
+enable_volumetric_lighting (Volumetric Lighting) bool false
+
+#   Set to true to render clouds as scatter volumes.
+#
+#   Requires: shaders, enable_post_processing, enable_clouds
+enable_volumetric_clouds (Volumetric Clouds) bool false
+
+#   Higher values reduce visual quality and may introduce artifacts, but improve performance of volumetric cloud/aurora effects.
+#   Range: from 1 to 4, default: 2
+#
+#   Requires: shaders, enable_post_processing
+volumetrics_undersampling (Volumetric Undersampling) int 2 1 4
+
+#   Set to true to render volumetric auroras ("Northern Lights").
+#
+#   Requires: shaders, enable_post_processing
+enable_volumetric_auroras (Volumetric Auroras) bool false
 
 [**Other Effects]
 

client/shaders/clouds_merge/opengl_fragment.glsl

@@ -1,24 +1,49 @@
 #define cloudsTexture texture0
 #define sceneTexture texture1
+#define depthmap texture2
 
 uniform sampler2D cloudsTexture;
 uniform sampler2D sceneTexture;
+uniform sampler2D depthmap;
 uniform vec2 texelSize0;
 
 uniform vec3 dayLight;
+uniform vec3 cloudColor;
 
 varying vec2 screenspaceCoordinate;
+varying vec3 relativePosition;
+varying vec3 viewDirection;
+varying vec3 sunTint;
+varying float auroraFactor;
+
+uniform vec3 cameraOffset;
+uniform vec3 cameraPosition;
+
+uniform float cameraNear;
+uniform float cameraFar;
+
+uniform float cloudHeight;
+uniform float cloudThickness;
+
+float getDepth(vec2 screenspacePosition) {
+	float depth = texture2D(depthmap, screenspacePosition * 0.5 + 0.5).r;
+	return cameraNear * cameraFar / (cameraFar + depth * (cameraNear - cameraFar));
+}
 
 vec4 sampleClouds(vec2 uv) {
 	vec4 cloudsKey = texture2D(cloudsTexture, uv);
 
-	const vec3 darkColor = vec3(0.05, 0.1, 0.2);
+	//const vec3 darkColor = vec3(0.05, 0.1, 0.2);
+	vec3 darkColor = vec3(0.2, 0.4, 0.8) * dayLight;
 	const vec3 auroraDark = vec3(0., 0.5, 0.5);
 	const vec3 auroraBright = vec3(0., 0.5, .0);
 
+	//const vec3 auroraDark = vec3(0.);
+	//const vec3 auroraBright = vec3(0.);
+
 	return vec4(
-		mix(auroraDark, auroraBright, cloudsKey.b) * cloudsKey.b * max(0., 1. - cloudsKey.r) + 
+		mix(auroraDark, auroraBright, cloudsKey.b) * cloudsKey.b * auroraFactor + 
-		cloudsKey.r * (darkColor * max(0., 1. - cloudsKey.g) + dayLight * cloudsKey.g),
+		cloudsKey.r * cloudColor * (darkColor * max(0., 1. - cloudsKey.g) + dayLight * sunTint * cloudsKey.g),
 	cloudsKey.r);
 }
 
@@ -37,8 +62,22 @@ vec4 getClouds(vec2 uv) {
 
 void main(void)
 {
-	vec4 cloudsColor = getClouds(screenspaceCoordinate * 0.5 + 0.5);
+	vec3 viewVec = normalize(relativePosition);
+
+	vec3 position = cameraOffset + cameraPosition;
+
+	float depth = getDepth(screenspaceCoordinate) / normalize(viewDirection).z;
+	float bottomPlaneIntersect = max((cloudHeight - cameraPosition.y) / viewVec.y, 0.);
+	float topPlaneIntersect = max((cloudHeight + cloudThickness - cameraPosition.y) / viewVec.y, 0.);
+	float minPlane = min(bottomPlaneIntersect, topPlaneIntersect);
+
 	vec4 sceneColor = texture2D(sceneTexture, screenspaceCoordinate * 0.5 + 0.5);
 
-	gl_FragColor = vec4(sceneColor.rgb * (1. - cloudsColor.a) + cloudsColor.rgb, 1.);
+	if (depth > minPlane) {
+		vec4 finalColor = getClouds(screenspaceCoordinate * 0.5 + 0.5);
+
+		gl_FragColor = vec4(sceneColor.rgb * (1. - finalColor.a) + finalColor.rgb, 1.);
+	} else {
+		gl_FragColor = sceneColor;
+	}
 }

client/shaders/clouds_merge/opengl_vertex.glsl

@@ -1,7 +1,48 @@
+uniform mat4 mCameraProjInv;
+uniform mat4 mCameraView;
+uniform vec3 v_LightDirection;
+uniform float f_timeofday;
+
+varying vec3 relativePosition;
+varying vec3 viewDirection;
 varying vec2 screenspaceCoordinate;
+varying vec3 sunTint;
+varying float auroraFactor;
+
+vec3 getDirectLightScatteringAtGround(vec3 v_LightDirection)
+{
+	// Based on talk at 2002 Game Developers Conference by Naty Hoffman and Arcot J. Preetham
+	const float beta_r0 = 1e-5; // Rayleigh scattering beta
+
+	// These factors are calculated based on expected value of scattering factor of 1e-5
+	// for Nitrogen at 532nm (green), 2e25 molecules/m3 in atmosphere
+	const vec3 beta_r0_l = vec3(3.3362176e-01, 8.75378289198826e-01, 1.95342379700656) * beta_r0; // wavelength-dependent scattering
+
+	const float atmosphere_height = 15000.; // height of the atmosphere in meters
+	// sun/moon light at the ground level, after going through the atmosphere
+	return exp(-beta_r0_l * atmosphere_height / (1e-5 - dot(v_LightDirection, vec3(0., 1., 0.))));
+}
+
+// custom smoothstep implementation because it's not defined in glsl1.2
+// https://docs.gl/sl4/smoothstep
+float mtsmoothstep(in float edge0, in float edge1, in float x)
+{
+	float t = clamp((x - edge0) / (edge1 - edge0), 0.0, 1.0);
+	return t * t * (3.0 - 2.0 * t);
+}
 
 void main(void)
 {
+	vec4 p = mCameraProjInv * inVertexPosition;
+	viewDirection = p.xyz / p.w;
+	relativePosition = (p.xyz / p.w) * mat3(mCameraView);
 	screenspaceCoordinate = inVertexPosition.xy;
+
+	auroraFactor = 1. - mtsmoothstep(0.13, 0.15, f_timeofday) * mtsmoothstep(0.87, 0.85, f_timeofday);
+
+	float tintFactor = mtsmoothstep(0.21, 0.24, f_timeofday) * mtsmoothstep(0.793, 0.753, f_timeofday);
+
+	sunTint = mix(vec3(1.0), getDirectLightScatteringAtGround(v_LightDirection), tintFactor);
+
 	gl_Position = inVertexPosition;
 }

client/shaders/coarse_noise_shader/opengl_fragment.glsl

@@ -1,17 +0,0 @@
-uniform float cloudDensity;
-
-// Pseudorandom number generator
-float rand(vec2 n) { 
-	return fract(sin(dot(n, vec2(12.9898, 4.1414))) * 43758.5453);
-}
-
-// More random pseudorandom number generator;
-float noise(vec2 p){
-	vec2 p2 = p + vec2(rand(p), rand(p.yx));
-	return rand(p2);
-}
-
-void main(void)
-{
-	gl_FragColor = vec4(vec3(step(noise(floor(gl_FragCoord.xy * 0.25)), cloudDensity)), 1.);
-}

client/shaders/coarse_noise_shader/opengl_vertex.glsl

@@ -1,4 +0,0 @@
-void main(void)
-{
-	gl_Position = inVertexPosition;
-}

client/shaders/noise_shader/opengl_fragment.glsl

@@ -1,15 +0,0 @@
-// Pseudorandom number generator
-float rand(vec2 n) { 
-	return fract(sin(dot(n, vec2(12.9898, 4.1414))) * 43758.5453);
-}
-
-// More random pseudorandom number generator;
-float noise(vec2 p){
-	vec2 p2 = p + vec2(rand(p), rand(p.yx));
-	return rand(p2);
-}
-
-void main(void)
-{
-	gl_FragColor = vec4(vec3(noise(gl_FragCoord.xy)), 1.);
-}

client/shaders/noise_shader/opengl_vertex.glsl

@@ -1,4 +0,0 @@
-void main(void)
-{
-	gl_Position = inVertexPosition;
-}

client/shaders/volumetric_clouds/opengl_fragment.glsl

@@ -2,10 +2,13 @@
 #define noiseTexture texture1
 #define noiseTextureCoarse texture2
 
+#define PROBING_ITERATIONS 30
 #define ITERATIONS 50
-#define LIGHT_ITERATIONS 10
+#define LIGHT_ITERATIONS 3
-#define LIGHT_DISTANCE 100.
+#define AURORA_ITERATIONS 80
-#define AURORA_ITERATIONS 100
+
+// See clouds.cpp
+#define CLOUD_SIZE 640.0
 
 uniform sampler2D depthmap;
 uniform sampler2D noiseTexture;
@@ -19,17 +22,17 @@ uniform float cloudDensity;
 
 varying vec3 relativePosition;
 varying vec3 viewDirection;
-uniform vec3 eyePosition;
 uniform vec3 cameraOffset;
 uniform vec3 cameraPosition;
 
-uniform mat4 mCameraView;
-uniform mat4 mCameraProjInv;
-
 uniform float cameraNear;
 uniform float cameraFar;
 
+uniform vec2 cloudOffset;
+uniform float cloudRadius;
+
 varying vec2 screenspaceCoordinate;
+varying float sunStrength;
 
 uniform float fogDistance;
 uniform float fogShadingParameter;
@@ -41,7 +44,8 @@ uniform float animationTimer;
 // Derived From http://alex.vlachos.com/graphics/Alex_Vlachos_Advanced_VR_Rendering_GDC2015.pdf
 // and https://www.shadertoy.com/view/MslGR8 (5th one starting from the bottom)
 // NOTE: `frag_coord` is in pixels (i.e. not normalized UV).
-float screenSpaceDither(highp vec2 frag_coord) {
+float screenSpaceDither(highp vec2 frag_coord) 
+{
 	// Iestyn's RGB dither (7 asm instructions) from Portal 2 X360, slightly modified for VR.
 	highp float dither = dot(vec2(171.0, 231.0), frag_coord);
 	dither = fract(dither / 103.0);
@@ -57,38 +61,47 @@ float mtsmoothstep(in float edge0, in float edge1, in float x)
 	return t * t * (3.0 - 2.0 * t);
 }
 
-float getDepth(vec2 screenspacePosition) {
+float toLinearDepth(float depth) 
-	float depth = texture2D(depthmap, screenspacePosition * 0.5 + 0.5).r;
+{
 	return cameraNear * cameraFar / (cameraFar + depth * (cameraNear - cameraFar));
 }
 
-float getRawDepth(vec2 screenspacePosition) {
+float getDepth(vec2 screenspacePosition) 
+{
 	return texture2D(depthmap, screenspacePosition * 0.5 + 0.5).r;
 }
 
-float noise(vec3 p){
+float noise(vec3 p) 
-    //p.y *= 1.;
+{
     float y = floor(p.y);
     float f1 = texture2D(noiseTexture, p.xz / 256. + y * 0.2).r;
     float f2 = texture2D(noiseTexture, p.xz / 256. + y * 0.2 + 0.2).r;
     return mix(f1, f2, fract(p.y));
 }
 
-float fnoise(vec3 p) {
+float fnoise(vec3 p) 
+{
     return noise(p * 4.) * 0.5 + noise(p * 8.) * 0.25;
 }
 
-float fnoise3(vec3 p) {
+float fnoise3(vec3 p) 
+{
     return noise(p * 4.) * 0.5 + noise(p * 8.) * 0.25 + noise(p * 16.) * 0.125;
 }
 
-float getAuroraDensity(vec3 position) {
+float getAuroraDensity(vec3 position) 
+{
 	float density = pow(max(0., 1. - 10. * abs(fnoise3(vec3(position.x * 0.25, animationTimer, position.z * 0.25)) - 0.5)), 4.);
-	return 1.0 * density * mtsmoothstep(0.0, 0.05, position.y - 1.) * pow(1. - mtsmoothstep(0.05, 2.0, position.y - 1.), 4.);
+	return 0.7 * density * mtsmoothstep(0.0, 0.05, position.y - 1.) * pow(1. - mtsmoothstep(0.05, 2.0, position.y - 1.), 4.);
 }
 
-float getDensity(vec3 position) {
+float getCoarse(vec3 position) {
-	float density = texture2D(noiseTextureCoarse, position.xz / 2560. / 16.).r *
+	return texture2D(noiseTextureCoarse, (position.xz - cloudOffset) * 0.5 / CLOUD_SIZE / cloudRadius).r;
+}
+
+float getDensity(vec3 position) 
+{
+	float density = texture2D(noiseTextureCoarse, (position.xz - cloudOffset) * 0.5 / CLOUD_SIZE / cloudRadius).r *
 		mtsmoothstep(0.0, cloudThickness * 0.2, position.y - cloudHeight) *
 		(1.0 - mtsmoothstep(cloudThickness * 0.5, cloudThickness, position.y - cloudHeight));
 
@@ -97,17 +110,19 @@ float getDensity(vec3 position) {
 	return 0.04 * density;
 }
 
-float getBrightness(vec3 position, float bias) {
+float getBrightness(vec3 position, float lightDistance) 
+{
 	float density = 0.;
-	for (int i = 0; i < LIGHT_ITERATIONS; i++) {
+	for (int i = 1; i <= LIGHT_ITERATIONS; i++) {
-		vec3 rayPosition = position - v_LightDirection * LIGHT_DISTANCE * (float(i) + bias) / float(LIGHT_ITERATIONS);
+		vec3 rayPosition = position - v_LightDirection * lightDistance * float(i) / float(LIGHT_ITERATIONS);
 
-		density += getDensity(rayPosition) * float(LIGHT_DISTANCE) / float(LIGHT_ITERATIONS);
+		density += getDensity(rayPosition) * float(lightDistance) / float(LIGHT_ITERATIONS);
 	}
 	return exp(-density);
 }
 
-float blend(float A, float B, float alphaA, float alphaB) {
+float blend(float A, float B, float alphaA, float alphaB) 
+{
     float alphaC = alphaA + (1. - alphaA) * alphaB;
     return (alphaA * A + (1. - alphaA) * alphaB * B) / alphaC;
 }
@@ -116,11 +131,16 @@ void main(void)
 {
 	vec3 viewVec = normalize(relativePosition);
 
-	vec3 position = cameraOffset + eyePosition;
+	vec3 position = cameraOffset + cameraPosition;
 
-	float depth = getDepth(screenspaceCoordinate) / normalize(viewDirection).z;
+	float depth = toLinearDepth(getDepth(screenspaceCoordinate)) / normalize(viewDirection).z;
-	float bottomPlaneIntersect = clamp(min((cloudHeight - eyePosition.y) / viewVec.y, depth), 0., 4. * fogDistance);
+	float bottomPlaneIntersect = clamp((cloudHeight - cameraPosition.y) / viewVec.y, 0., 4. * fogDistance);
-	float topPlaneIntersect = clamp(min((cloudHeight + cloudThickness - eyePosition.y) / viewVec.y, depth), 0., 4. * fogDistance);
+	float topPlaneIntersect = clamp((cloudHeight + cloudThickness - cameraPosition.y) / viewVec.y, 0., 4. * fogDistance);
+
+	if ((bottomPlaneIntersect > depth + 5.0) != (topPlaneIntersect > depth + 5.0)) {
+		bottomPlaneIntersect = min(depth, bottomPlaneIntersect);
+		topPlaneIntersect = min(depth, topPlaneIntersect);
+	}
 
 	float startDepth = min(bottomPlaneIntersect, topPlaneIntersect);
 	float endDepth = max(bottomPlaneIntersect, topPlaneIntersect);
@@ -129,17 +149,15 @@ void main(void)
 
 	vec3 color = vec3(0.);
 
-	float dx = (endDepth - startDepth) / float(ITERATIONS);
-
 	float density = 0.;
 
 	float auroraStartDepth = min(max(0., 1.0 / viewVec.y), 8.);
 	float auroraEndDepth = min(max(0., 3.0 / viewVec.y), 8.);
-	float rawDepth = getRawDepth(screenspaceCoordinate);
+	float rawDepth = getDepth(screenspaceCoordinate);
 
 	if (auroraEndDepth - auroraStartDepth > 0.1 && rawDepth >= 1.0) {
-		for (int i = 0; i < ITERATIONS; i++) {
+		for (int i = 0; i < AURORA_ITERATIONS; i++) {
-			vec3 rayPosition = viewVec * (auroraStartDepth + (auroraEndDepth - auroraStartDepth) * (float(i) + bias) / float(ITERATIONS));
+			vec3 rayPosition = viewVec * (auroraStartDepth + (auroraEndDepth - auroraStartDepth) * (float(i) + bias) / float(AURORA_ITERATIONS));
 
 			float localDensity = getAuroraDensity(rayPosition);
 
@@ -154,17 +172,26 @@ void main(void)
 	float sunlightContribution = 0.;
 	float alpha = 0.;
 	float outScatter = 2. * (dot(v_LightDirection, viewVec) * 0.5 + 0.5);
+	float forwardScatter = 1. + 2. * pow(min(dot(v_LightDirection, viewVec), 0.), 4.);
 	density = 0.;
 
+	float fogDepth = min(4. * fogDistance, startDepth + 2000.);
+	endDepth = min(endDepth, fogDepth);
+
+	float dx = (endDepth - startDepth) / float(ITERATIONS);
+	float lightDistance = cloudThickness * 0.5;
+
+	if (endDepth - startDepth > 0.1) {
 		for (int i = 0; i < ITERATIONS; i++) {
-		vec3 rayPosition = eyePosition + viewVec * (startDepth + (endDepth - startDepth) * (float(i) + bias) / float(ITERATIONS));
+			vec3 rayPosition = cameraPosition + viewVec * (startDepth + (endDepth - startDepth) * (float(i) + bias) / float(ITERATIONS));
 
 			float localDensity = getDensity(rayPosition) * dx;
 
 			if (localDensity < 0.0001) continue;
 
-		float clarity = clamp(fogShadingParameter - fogShadingParameter * length(rayPosition - eyePosition) / (4. * fogDistance), 0.0, 1.0);
+			float clarity = clamp(fogShadingParameter - fogShadingParameter * length(rayPosition - cameraPosition) / (fogDepth), 0.0, 1.0);
-		float brightness = getBrightness(rayPosition, bias) * exp(-outScatter * localDensity);
+			float outScatterContribution = exp(-0.5 * outScatter * localDensity);
+			float brightness = getBrightness(rayPosition, lightDistance) * forwardScatter * outScatterContribution * sunStrength + (1. - outScatterContribution);
 			sunlightContribution = blend(sunlightContribution, brightness, 1. - exp(-density), 1. - exp(-localDensity));
 			alpha = blend(alpha, clarity, 1. - exp(-density), 1. - exp(-localDensity));
 
@@ -172,11 +199,11 @@ void main(void)
 
 			if (density > 10.0) break;
 		}
-
+	}
-	float forwardScatter = 1. + 4. * pow(min(dot(v_LightDirection, viewVec), 0.), 4.);
 
 	color.r = (1. - exp(-density)) * alpha;
-	color.g = sunlightContribution * forwardScatter;
+	color.g = sunlightContribution;
+	color.b *= exp(-density);
 
 	gl_FragColor = vec4(color, 1.0);
 }

client/shaders/volumetric_clouds/opengl_vertex.glsl

@@ -1,11 +1,18 @@
 uniform mat4 mCameraProjInv;
 uniform mat4 mCameraView;
-uniform vec3 eyePosition;
+uniform float f_timeofday;
 
 varying vec3 relativePosition;
 varying vec3 viewDirection;
 
 varying vec2 screenspaceCoordinate;
+varying float sunStrength;
+
+float mtsmoothstep(in float edge0, in float edge1, in float x)
+{
+	float t = clamp((x - edge0) / (edge1 - edge0), 0.0, 1.0);
+	return t * t * (3.0 - 2.0 * t);
+}
 
 void main(void)
 {
@@ -13,5 +20,18 @@ void main(void)
 	vec4 p = mCameraProjInv * inVertexPosition;
 	viewDirection = p.xyz / p.w;
 	relativePosition = (p.xyz / p.w) * mat3(mCameraView);
+
+	if (f_timeofday < 0.21) {
+		sunStrength = 
+			(1.0 - mtsmoothstep(0.18, 0.21, f_timeofday));
+	} else if (f_timeofday >= 0.793) {
+		sunStrength = 
+			mtsmoothstep(0.793, 0.823, f_timeofday);
+	} else {
+		sunStrength = 
+			mtsmoothstep(0.21, 0.26, f_timeofday) *
+			(1.0 - mtsmoothstep(0.743, 0.793, f_timeofday));	
+	}
+
 	gl_Position = inVertexPosition;
 }

src/client/clouds.cpp

@@ -45,7 +45,7 @@ Clouds::Clouds(scene::ISceneManager* mgr, IShaderSource *ssrc,
 		s32 id,
 		u32 seed
 ):
-	scene::ISceneNode(mgr->getRootSceneNode(), mgr, id),
+	scene::ISceneNode(g_settings->getBool("enable_volumetric_clouds") ? nullptr : mgr->getRootSceneNode(), mgr, id),
 	m_seed(seed)
 {
 	m_enable_shaders = g_settings->getBool("enable_shaders");
@@ -106,6 +106,14 @@ void Clouds::updateMesh()
 		std::floor(center_of_drawing_in_noise_f.Y / cloud_size)
 	);
 
+	// The world position of the integer center point of drawing in the noise
+	v2f world_center_of_drawing_in_noise_f = v2f(
+		center_of_drawing_in_noise_i.X * cloud_size,
+		center_of_drawing_in_noise_i.Y * cloud_size
+	) + m_origin;
+
+	m_noise_position = world_center_of_drawing_in_noise_f - ((float)m_cloud_radius_i + 0.5f) * cloud_size;
+
 	// Only update mesh if it has moved enough, this saves lots of GPU buffer uploads.
 	constexpr float max_d = 5 * BS;
 
@@ -128,12 +136,6 @@ void Clouds::updateMesh()
 
 	const u32 num_faces_to_draw = m_enable_3d ? 6 : 1;
 
-	// The world position of the integer center point of drawing in the noise
-	v2f world_center_of_drawing_in_noise_f = v2f(
-		center_of_drawing_in_noise_i.X * cloud_size,
-		center_of_drawing_in_noise_i.Y * cloud_size
-	) + m_origin;
-
 	// Colors with primitive shading
 
 	video::SColorf c_top_f(m_color);
@@ -160,7 +162,7 @@ void Clouds::updateMesh()
 
 	// Read noise
 
-	std::vector<bool> grid(m_cloud_radius_i * 2 * m_cloud_radius_i * 2);
+	m_grid.resize(m_cloud_radius_i * 2 * m_cloud_radius_i * 2);
 
 	for(s16 zi = -m_cloud_radius_i; zi < m_cloud_radius_i; zi++) {
 		u32 si = (zi + m_cloud_radius_i) * m_cloud_radius_i * 2 + m_cloud_radius_i;
@@ -168,7 +170,7 @@ void Clouds::updateMesh()
 		for (s16 xi = -m_cloud_radius_i; xi < m_cloud_radius_i; xi++) {
 			u32 i = si + xi;
 
-			grid[i] = gridFilled(
+			m_grid[i] = gridFilled(
 				xi + center_of_drawing_in_noise_i.X,
 				zi + center_of_drawing_in_noise_i.Y
 			);
@@ -205,7 +207,7 @@ void Clouds::updateMesh()
 
 		u32 i = GETINDEX(xi, zi, m_cloud_radius_i);
 
-		if (!grid[i])
+		if (!m_grid[i])
 			continue;
 
 		v2f p0 = v2f(xi,zi)*cloud_size + world_center_of_drawing_in_noise_f;
@@ -238,7 +240,7 @@ void Clouds::updateMesh()
 			case 1: // back
 				if (INAREA(xi, zi - 1, m_cloud_radius_i)) {
 					u32 j = GETINDEX(xi, zi - 1, m_cloud_radius_i);
-					if(grid[j])
+					if(m_grid[j])
 						continue;
 				}
 				for (video::S3DVertex &vertex : v) {
@@ -253,7 +255,7 @@ void Clouds::updateMesh()
 			case 2: //right
 				if (INAREA(xi + 1, zi, m_cloud_radius_i)) {
 					u32 j = GETINDEX(xi+1, zi, m_cloud_radius_i);
-					if(grid[j])
+					if(m_grid[j])
 						continue;
 				}
 				for (video::S3DVertex &vertex : v) {
@@ -268,7 +270,7 @@ void Clouds::updateMesh()
 			case 3: // front
 				if (INAREA(xi, zi + 1, m_cloud_radius_i)) {
 					u32 j = GETINDEX(xi, zi + 1, m_cloud_radius_i);
-					if(grid[j])
+					if(m_grid[j])
 						continue;
 				}
 				for (video::S3DVertex &vertex : v) {
@@ -283,7 +285,7 @@ void Clouds::updateMesh()
 			case 4: // left
 				if (INAREA(xi-1, zi, m_cloud_radius_i)) {
 					u32 j = GETINDEX(xi-1, zi, m_cloud_radius_i);
-					if(grid[j])
+					if(m_grid[j])
 						continue;
 				}
 				for (video::S3DVertex &vertex : v) {
@@ -343,7 +345,6 @@ void Clouds::updateMesh()
 
 void Clouds::render()
 {
-#if 0
 	if (m_params.density <= 0.0f)
 		return; // no need to do anything
 
@@ -389,12 +390,38 @@ void Clouds::render()
 				cloud_full_radius*1.2, fog_density, fog_pixelfog, fog_rangefog);
 	}
 
+//#if 0
 	driver->drawMeshBuffer(m_meshbuffer.get());
-
+//#endif
 	// Restore fog settings
 	driver->setFog(fog_color, fog_type, fog_start, fog_end, fog_density,
 			fog_pixelfog, fog_rangefog);
-#endif
+}
+
+void Clouds::renderDepth() {
+	if (m_params.density <= 0.0f)
+		return; // no need to do anything
+
+	video::IVideoDriver* driver = SceneManager->getVideoDriver();
+
+	updateMesh();
+
+	// Update position
+	{
+		v2f off_origin = m_origin - m_mesh_origin;
+		v3f rel(off_origin.X, 0, off_origin.Y);
+		rel -= intToFloat(m_camera_offset, BS);
+		setPosition(rel);
+		updateAbsolutePosition();
+	}
+
+	video::SMaterial material = m_material;
+	material.MaterialType = video::EMT_SOLID;
+	material.ZWriteEnable = video::EZW_ON;
+
+	driver->setTransform(video::ETS_WORLD, AbsoluteTransformation);
+	driver->setMaterial(material);
+	driver->drawMeshBuffer(m_meshbuffer.get());
 }
 
 void Clouds::step(float dtime)

src/client/clouds.h

@@ -52,6 +52,8 @@ public:
 
 	virtual void render();
 
+	void renderDepth();
+
 	virtual const aabb3f &getBoundingBox() const
 	{
 		return m_box;
@@ -140,6 +142,16 @@ public:
 
 	const video::SColor getColor() const { return m_color.toSColor(); }
 
+	bool getGrid(int x, int y)
+	{
+		int index = x + y * m_cloud_radius_i * 2;
+		if (index < 0 || index >= m_grid.size())
+			return false;
+		return m_grid[index];
+	}
+
+	v2f getCloudOffset() const { return m_noise_position; }
+
 private:
 	void updateBox()
 	{
@@ -173,6 +185,7 @@ private:
 	u16 m_cloud_radius_i;
 	u32 m_seed;
 	v3f m_camera_pos;
+	v2f m_noise_position;
 
 	v3s16 m_camera_offset;
 	bool m_camera_inside_cloud = false;
@@ -180,4 +193,7 @@ private:
 	bool m_enable_shaders, m_enable_3d;
 	video::SColorf m_color = video::SColorf(1.0f, 1.0f, 1.0f, 1.0f);
 	CloudParams m_params;
+
+	std::vector<bool> m_grid;
+
 };

src/client/game.cpp

@@ -383,11 +383,10 @@ class GameGlobalShaderConstantSetter : public IShaderConstantSetter
 		m_animation_timer_delta_pixel{"animationTimerDelta"};
 	CachedPixelShaderSetting<float, 3> m_artificial_light{ "artificialLight" };
 	CachedPixelShaderSetting<float, 3> m_day_light{"dayLight"};
-	CachedPixelShaderSetting<float, 3> m_eye_position_pixel{ "eyePosition" };
-	CachedVertexShaderSetting<float, 3> m_eye_position_vertex{ "eyePosition" };
 	CachedPixelShaderSetting<float, 3> m_minimap_yaw{"yawVec"};
-	CachedPixelShaderSetting<float, 3> m_camera_offset_pixel{"cameraOffset"};
 	CachedVertexShaderSetting<float, 3> m_camera_offset_vertex{"cameraOffset"};
+	CachedPixelShaderSetting<float, 3> m_camera_offset_pixel{ "cameraOffset" };
+	CachedVertexShaderSetting<float, 3> m_camera_position_vertex{"cameraPosition"};
 	CachedPixelShaderSetting<float, 3> m_camera_position_pixel{"cameraPosition"};
 	CachedVertexShaderSetting<float, 16> m_camera_projinv_vertex{"mCameraProjInv"};
 	CachedPixelShaderSetting<float, 16> m_camera_projinv_pixel{"mCameraProjInv"};
@@ -420,6 +419,8 @@ class GameGlobalShaderConstantSetter : public IShaderConstantSetter
 	CachedPixelShaderSetting<float> m_cloud_height_pixel{"cloudHeight"};
 	CachedPixelShaderSetting<float> m_cloud_thickness_pixel{"cloudThickness"};
 	CachedPixelShaderSetting<float> m_cloud_density_pixel{"cloudDensity"};
+	CachedPixelShaderSetting<float, 2> m_cloud_offset_pixel{"cloudOffset"};
+	CachedPixelShaderSetting<float> m_cloud_radius_pixel{"cloudRadius"};
 	CachedPixelShaderSetting<float> m_saturation_pixel{"saturation"};
 	float m_gamma;
 	CachedPixelShaderSetting<float> m_gamma_pixel{"gamma"};
@@ -432,6 +433,8 @@ class GameGlobalShaderConstantSetter : public IShaderConstantSetter
 	CachedPixelShaderSetting<float> m_moon_brightness_pixel{"moonBrightness"};
 	CachedPixelShaderSetting<float>
 		m_volumetric_light_strength_pixel{"volumetricLightStrength"};
+	CachedPixelShaderSetting<float, 3>
+		m_volumetric_cloud_color{"cloudColor"};
 
 	static constexpr std::array<const char*, 5> SETTING_CALLBACKS = {
 		"exposure_compensation",
@@ -501,20 +504,17 @@ public:
 		m_animation_timer_delta_vertex.set(&animation_timer_delta_f, services);
 		m_animation_timer_delta_pixel.set(&animation_timer_delta_f, services);
 
-		v3f epos = m_client->getEnv().getLocalPlayer()->getEyePosition();
-		m_eye_position_pixel.set(epos, services);
-		m_eye_position_vertex.set(epos, services);
-
 		if (m_client->getMinimap()) {
 			v3f minimap_yaw = m_client->getMinimap()->getYawVec();
 			m_minimap_yaw.set(minimap_yaw, services);
 		}
 
 		v3f offset = intToFloat(m_client->getCamera()->getOffset(), BS);
-		m_camera_offset_pixel.set(offset, services);
 		m_camera_offset_vertex.set(offset, services);
+		m_camera_offset_pixel.set(offset, services);
 
 		v3f camera_position = m_client->getCamera()->getPosition();
+		m_camera_position_vertex.set(camera_position, services);
 		m_camera_position_pixel.set(camera_position, services);
 
 		core::matrix4 camera_proj = m_client->getCamera()->getCameraNode()->getProjectionMatrix();
@@ -573,13 +573,19 @@ public:
 
 		// TODO: settings
 		Clouds* clouds = m_client->getClouds();
-		if (m_client->getClouds()) {
+		if (clouds && g_settings->getBool("enable_volumetric_clouds")) {
 			float cloud_height = clouds->getHeight() * 10.0f;
 			m_cloud_height_pixel.set(&cloud_height, services);
 			float cloud_thickness = clouds->getThickness() * 10.0f;
 			m_cloud_thickness_pixel.set(&cloud_thickness, services);
 			float cloud_density = clouds->getDensity();
 			m_cloud_density_pixel.set(&cloud_density, services);
+			v2f cloud_offset = clouds->getCloudOffset();
+			m_cloud_offset_pixel.set(cloud_offset, services);
+			float cloud_radius = g_settings->getU16("cloud_radius");
+			m_cloud_radius_pixel.set(&cloud_radius, services);
+			video::SColor cloud_color = clouds->getColor();
+			m_volumetric_cloud_color.set(cloud_color, services);
 		}
 
 		if (m_volumetric_light_enabled) {
@@ -4294,7 +4300,7 @@ void Game::updateClouds(float dtime)
 		camera_node_position.Y   = camera_node_position.Y + camera_offset.Y * BS;
 		camera_node_position.Z   = camera_node_position.Z + camera_offset.Z * BS;
 		this->clouds->update(camera_node_position, this->sky->getCloudColor());
-		if (this->clouds->isCameraInsideCloud() && this->fogEnabled()) {
+		if (this->clouds->isCameraInsideCloud() && this->fogEnabled() && !g_settings->getBool("enable_volumetric_clouds")) {
 			// If camera is inside cloud and fog is enabled, use cloud's colors as sky colors.
 			video::SColor clouds_dark = this->clouds->getColor().getInterpolated(
 					video::SColor(255, 0, 0, 0), 0.9);

src/client/render/pipeline.cpp

@@ -113,6 +113,18 @@ void TextureBuffer::swapTextures(u8 texture_a, u8 texture_b)
 	m_textures[texture_b] = temp;
 }
 
+void TextureBuffer::setTextureImage(u8 id, video::IImage* image) {
+	assert(m_definitions[id].valid);
+
+	auto &definition = m_definitions[id];
+
+	if (m_textures[id]) m_driver->removeTexture(m_textures[id]);
+
+	m_textures[id] = m_driver->addTexture(definition.name.c_str(), image);
+	definition.fixed_size = true;
+	definition.size = image->getDimension();
+	definition.dirty = false;
+}
 
 bool TextureBuffer::ensureTexture(video::ITexture **texture, const TextureDefinition& definition, PipelineContext &context)
 {
@@ -183,6 +195,8 @@ void TextureBufferOutput::activate(PipelineContext &context)
 	if (!render_target)
 		render_target = driver->addRenderTarget();
 
+	if (disable_clear) m_clear = false;
+
 	core::array<video::ITexture *> textures;
 	core::dimension2du size(0, 0);
 	for (size_t i = 0; i < texture_map.size(); i++) {

src/client/render/pipeline.h

@@ -141,6 +141,7 @@ public:
 	virtual video::ITexture *getTexture(u8 index) override;
 	virtual void reset(PipelineContext &context) override;
 	void swapTextures(u8 texture_a, u8 texture_b);
+	void setTextureImage(u8 id, video::IImage* image);
 private:
 	static const u8 NO_DEPTH_TEXTURE = 255;
 
@@ -182,6 +183,7 @@ public:
 	TextureBufferOutput(TextureBuffer *buffer, const std::vector<u8> &texture_map, u8 depth_stencil);
 	virtual ~TextureBufferOutput() override;
 	void activate(PipelineContext &context) override;
+	void disableClearing() { disable_clear = true; }
 private:
 	static const u8 NO_DEPTH_TEXTURE = 255;
 
@@ -190,6 +192,7 @@ private:
 	u8 depth_stencil { NO_DEPTH_TEXTURE };
 	video::IRenderTarget* render_target { nullptr };
 	video::IVideoDriver* driver { nullptr };
+	bool disable_clear = false;
 };
 
 /**

src/client/render/secondstage.cpp

@@ -24,64 +24,114 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "client/shader.h"
 #include "client/tile.h"
 #include "settings.h"
+#include "noise.h"
 
 class NoiseStep : public RenderStep {
 public:
-	NoiseStep(u32 shader_id, u8 texture_id) :
+	NoiseStep(TextureBuffer* buffer, u8 id, u32 size) :
-		shader_id(shader_id), texture_id(texture_id)
+		buffer(buffer), id(id), size(size)
 	{
-		material.UseMipMaps = false;
-		material.ZBuffer = true;
-		material.ZWriteEnable = video::EZW_ON;
 	}
 
-	void setRenderSource(RenderSource* _source) override {
+	void setRenderSource(RenderSource* _source) override {}
-		source = _source;
+
+	void setRenderTarget(RenderTarget* _target) override {}
+
+	void reset(PipelineContext& context) override {}
+
+	void run(PipelineContext& context) override
+	{
+		if (!needs_run) return;
+
+		needs_run = false;
+
+		video::IImage* noise_image = context.device->getVideoDriver()->createImage(video::ECF_A8R8G8B8, core::dimension2du(256, 256));
+		PseudoRandom random;
+		for (u32 i = 0; i < size * size; ++i) {
+			noise_image->setPixel(i % size, i / size, video::SColor(0, random.next() % 256, 0, 0));
+		}
+		buffer->setTextureImage(id, noise_image);
+		noise_image->drop();
 	}
 
-	void setRenderTarget(RenderTarget* _target) override {
+private:
+	u32 size;
+	u8 id;
+	TextureBuffer* buffer = nullptr;
+	bool needs_run = true;
+};
+
+class CloudDensityStep : public RenderStep {
+public:
+	CloudDensityStep(TextureBuffer* buffer, u8 id, Clouds* clouds) :
+		buffer(buffer), id(id), clouds(clouds)
+	{
+	}
+
+	void setRenderSource(RenderSource* _source) override {}
+
+	void setRenderTarget(RenderTarget* _target) override {}
+
+	void reset(PipelineContext& context) override {}
+
+	void run(PipelineContext& context) override
+	{
+		u16 cloud_radius = g_settings->getU16("cloud_radius");
+		if (cloud_radius < 1) cloud_radius = 1;
+
+		video::IImage* image = context.device->getVideoDriver()->createImage(video::ECF_A8R8G8B8, core::dimension2du(8 * cloud_radius, 8 * cloud_radius));
+
+		for (int x = 0; x < 2 * cloud_radius; ++x) {
+			for (int y = 0; y < 2 * cloud_radius; ++y) {
+				bool isFilled = clouds->getGrid(x, y);
+
+				for (int i = 0; i < 16; ++i) {
+					int xp = x * 4 + i % 4;
+					int yp = y * 4 + i / 4;
+
+					image->setPixel(xp, yp, video::SColor(255, isFilled * 255, 0, 0));
+				}
+			}
+		}
+
+		buffer->setTextureImage(id, image);
+
+		image->drop();
+	}
+
+private:
+	Clouds* clouds = nullptr;
+	u8 id = 0;
+	TextureBuffer* buffer = nullptr;
+};
+
+class CloudDepthStep : public RenderStep {
+public:
+	CloudDepthStep(Clouds* clouds) :
+		clouds(clouds)
+	{
+	}
+
+	void setRenderSource(RenderSource* _source) override {}
+
+	void setRenderTarget(RenderTarget* _target) override
+	{
 		target = _target;
 	}
 
 	void reset(PipelineContext& context) override {}
 
-	void run(PipelineContext& context) override {
+	void run(PipelineContext& context) override
-		video::ITexture* texture = source->getTexture(texture_id);
+	{
-		if (texture != last_texture) {
-			last_texture = texture;
-
 		if (target)
 			target->activate(context);
 
-			// attach the shader
+		clouds->renderDepth();
-			material.MaterialType = context.client->getShaderSource()->getShaderInfo(shader_id).material;
-
-			auto driver = context.device->getVideoDriver();
-
-			static const video::SColor color = video::SColor(0, 0, 0, 255);
-			static const video::S3DVertex vertices[4] = {
-					video::S3DVertex(1.0, -1.0, 0.0, 0.0, 0.0, -1.0,
-							color, 1.0, 0.0),
-					video::S3DVertex(-1.0, -1.0, 0.0, 0.0, 0.0, -1.0,
-							color, 0.0, 0.0),
-					video::S3DVertex(-1.0, 1.0, 0.0, 0.0, 0.0, -1.0,
-							color, 0.0, 1.0),
-					video::S3DVertex(1.0, 1.0, 0.0, 0.0, 0.0, -1.0,
-							color, 1.0, 1.0),
-			};
-			static const u16 indices[6] = { 0, 1, 2, 2, 3, 0 };
-			driver->setMaterial(material);
-			driver->drawVertexPrimitiveList(&vertices, 4, &indices, 2);
-		}
 	}
 
 private:
-	u32 shader_id;
+	Clouds* clouds = nullptr;
-	u8 texture_id;
+	RenderTarget* target = nullptr;
-	video::SMaterial material;
-	video::ITexture* last_texture = nullptr;
-	RenderSource* source{ nullptr };
-	RenderTarget* target{ nullptr };
 };
 
 PostProcessingStep::PostProcessingStep(u32 _shader_id, const std::vector<u8> &_texture_map) :
@@ -160,6 +210,11 @@ void PostProcessingStep::setWrapRepeat(u8 index, bool value) {
 	material.TextureLayers[index].TextureWrapV = value ? video::ETC_REPEAT : video::ETC_CLAMP_TO_EDGE;
 }
 
+void PostProcessingStep::disableDepthTest() {
+	material.ZBuffer = video::ECFN_DISABLED;
+	material.ZWriteEnable = video::EZW_OFF;
+}
+
 RenderStep *addPostProcessing(RenderPipeline *pipeline, RenderStep *previousStep, v2f scale, Client *client)
 {
 	auto buffer = pipeline->createOwned<TextureBuffer>();
@@ -201,8 +256,8 @@ RenderStep *addPostProcessing(RenderPipeline *pipeline, RenderStep *previousStep
 	const bool enable_ssaa = antialiasing == "ssaa";
 	const bool enable_fxaa = antialiasing == "fxaa";
 	const bool enable_volumetric_light = g_settings->getBool("enable_volumetric_lighting") && enable_bloom;
-	const bool enable_volumetric_clouds = true;
+	// TODO: Proper constraints
-	// TODO: Add clouds setting
+	const bool enable_volumetric_clouds = g_settings->getBool("enable_volumetric_clouds") && client->getClouds();
 
 	if (enable_ssaa) {
 		u16 ssaa_scale = MYMAX(2, g_settings->getU16("fsaa"));
@@ -227,21 +282,20 @@ RenderStep *addPostProcessing(RenderPipeline *pipeline, RenderStep *previousStep
 
 	u8 source = TEXTURE_COLOR;
 
+	u8 final_color_source = TEXTURE_COLOR;
+	
 	if (enable_volumetric_clouds) {
+		const u16 cloud_radius = g_settings->getU16("cloud_radius");
+
 		buffer->setTexture(TEXTURE_NOISE, core::dimension2du(256, 256), "noise", color_format);
+		pipeline->addStep<NoiseStep>(buffer, TEXTURE_NOISE, 256);
 
-		shader_id = client->getShaderSource()->getShader("noise_shader", TILE_MATERIAL_PLAIN, NDT_MESH);
+		buffer->setTexture(TEXTURE_NOISE_COARSE, core::dimension2du(cloud_radius * 8, cloud_radius * 8), "noise_coarse", color_format);
-		RenderStep *noise_step = pipeline->addStep<NoiseStep>(shader_id, TEXTURE_NOISE);
+		pipeline->addStep<CloudDensityStep>(buffer, TEXTURE_NOISE_COARSE, client->getClouds());
-		noise_step->setRenderSource(buffer);
-		noise_step->setRenderTarget(pipeline->createOwned<TextureBufferOutput>(buffer, TEXTURE_NOISE));
 
-		buffer->setTexture(TEXTURE_NOISE_COARSE, core::dimension2du(256, 256), "noise", color_format);
+		u32 undersampling = core::clamp(g_settings->getU32("volumetrics_undersampling"), (u32)1, (u32)4);
 
-		shader_id = client->getShaderSource()->getShader("coarse_noise_shader", TILE_MATERIAL_PLAIN, NDT_MESH);
+		buffer->setTexture(TEXTURE_CLOUDS_1, scale / (float)undersampling, "clouds_1", color_format, /*clear:*/ true);
-		noise_step = pipeline->addStep<PostProcessingStep>(shader_id, std::vector<u8>());
-		noise_step->setRenderTarget(pipeline->createOwned<TextureBufferOutput>(buffer, TEXTURE_NOISE_COARSE));
-
-		buffer->setTexture(TEXTURE_CLOUDS_1, scale * 0.25f, "clouds_1", color_format, /*clear:*/ true);
 		buffer->setTexture(TEXTURE_CLOUDS_2, scale, "clouds_2", color_format);
 		buffer->setTexture(TEXTURE_CLOUD_DENSITY, scale, "cloud_density", color_format);
 
@@ -253,16 +307,24 @@ RenderStep *addPostProcessing(RenderPipeline *pipeline, RenderStep *previousStep
 		volumetric_clouds->setBilinearFilter(2, true);
 		volumetric_clouds->setWrapRepeat(1, true);
 		volumetric_clouds->setWrapRepeat(2, true);
+		volumetric_clouds->disableDepthTest();
 
 		source = TEXTURE_CLOUDS_1;
 
 		shader_id = client->getShaderSource()->getShader("clouds_merge", TILE_MATERIAL_PLAIN, NDT_MESH);
-		PostProcessingStep* blend_clouds = pipeline->addStep<PostProcessingStep>(shader_id, std::vector<u8> { TEXTURE_CLOUDS_1, TEXTURE_COLOR });
+		PostProcessingStep* blend_clouds = pipeline->addStep<PostProcessingStep>(shader_id, std::vector<u8> { TEXTURE_CLOUDS_1, TEXTURE_COLOR, TEXTURE_DEPTH });
 		blend_clouds->setRenderSource(buffer);
 		blend_clouds->setRenderTarget(pipeline->createOwned<TextureBufferOutput>(buffer, TEXTURE_CLOUDS_2));
 		blend_clouds->setBilinearFilter(0, true);
+		blend_clouds->disableDepthTest();
+
+		CloudDepthStep* cloud_depth = pipeline->addStep<CloudDepthStep>(client->getClouds());
+		TextureBufferOutput* cloud_depth_output = pipeline->createOwned<TextureBufferOutput>(buffer, std::vector<u8>{ TEXTURE_COLOR }, TEXTURE_DEPTH);
+		cloud_depth_output->disableClearing();
+		cloud_depth->setRenderTarget(cloud_depth_output);
 
 		source = TEXTURE_CLOUDS_2;
+		final_color_source = TEXTURE_CLOUDS_2;
 	}
 
 	// common downsampling step for bloom or autoexposure
@@ -281,7 +343,7 @@ RenderStep *addPostProcessing(RenderPipeline *pipeline, RenderStep *previousStep
 
 			// get bright spots
 			u32 shader_id = client->getShaderSource()->getShader("extract_bloom", TILE_MATERIAL_PLAIN, NDT_MESH);
-			auto extract_bloom = pipeline->addStep<PostProcessingStep>(shader_id, std::vector<u8> { source, TEXTURE_EXPOSURE_1 });
+			RenderStep* extract_bloom = pipeline->addStep<PostProcessingStep>(shader_id, std::vector<u8> { source, TEXTURE_EXPOSURE_1 });
 			extract_bloom->setRenderSource(buffer);
 			extract_bloom->setRenderTarget(pipeline->createOwned<TextureBufferOutput>(buffer, TEXTURE_BLOOM));
 			source = TEXTURE_BLOOM;
@@ -332,14 +394,14 @@ RenderStep *addPostProcessing(RenderPipeline *pipeline, RenderStep *previousStep
 	}
 
 	// FXAA
-	u8 final_stage_source = TEXTURE_CLOUDS_2;
+	u8 final_stage_source = final_color_source;
 
 	if (enable_fxaa) {
 		final_stage_source = TEXTURE_FXAA;
 
 		buffer->setTexture(TEXTURE_FXAA, scale, "fxaa", color_format);
 		shader_id = client->getShaderSource()->getShader("fxaa", TILE_MATERIAL_PLAIN);
-		PostProcessingStep *effect = pipeline->createOwned<PostProcessingStep>(shader_id, std::vector<u8> { TEXTURE_COLOR });
+		PostProcessingStep* effect = pipeline->createOwned<PostProcessingStep>(shader_id, std::vector<u8> { final_color_source });
 		pipeline->addStep(effect);
 		effect->setBilinearFilter(0, true);
 		effect->setRenderSource(buffer);
@@ -348,7 +410,7 @@ RenderStep *addPostProcessing(RenderPipeline *pipeline, RenderStep *previousStep
 
 	// final merge
 	shader_id = client->getShaderSource()->getShader("second_stage", TILE_MATERIAL_PLAIN, NDT_MESH);
-	PostProcessingStep *effect = pipeline->createOwned<PostProcessingStep>(shader_id, std::vector<u8> { final_stage_source, TEXTURE_SCALE_UP, TEXTURE_EXPOSURE_2 });
+	PostProcessingStep* effect = pipeline->createOwned<PostProcessingStep>(shader_id, std::vector<u8> { final_stage_source, TEXTURE_SCALE_UP, TEXTURE_EXPOSURE_2 });
 	pipeline->addStep(effect);
 	if (enable_ssaa)
 		effect->setBilinearFilter(0, true);

src/client/render/secondstage.h

@@ -52,6 +52,10 @@ public:
 
 	void setWrapRepeat(u8 index, bool value);
 
+	void setColor(video::SColor color);
+
+	void disableDepthTest();
+
 private:
 	u32 shader_id;
 	std::vector<u8> texture_map;

src/defaultsettings.cpp

@@ -342,6 +342,7 @@ void set_default_settings()
 	settings->setDefault("bloom_intensity", "0.05");
 	settings->setDefault("bloom_radius", "1");
 	settings->setDefault("enable_volumetric_lighting", "false");
+	settings->setDefault("enable_volumetric_clouds", "false");
 	settings->setDefault("enable_bumpmaps", "false");
 
 	// Effects Shadows