Volumetric effects

client/shaders/clouds_merge/opengl_fragment.glsl

@@ -0,0 +1,44 @@
+#define cloudsTexture texture0
+#define sceneTexture texture1
+
+uniform sampler2D cloudsTexture;
+uniform sampler2D sceneTexture;
+uniform vec2 texelSize0;
+
+uniform vec3 dayLight;
+
+varying vec2 screenspaceCoordinate;
+
+vec4 sampleClouds(vec2 uv) {
+	vec4 cloudsKey = texture2D(cloudsTexture, uv);
+
+	const vec3 darkColor = vec3(0.05, 0.1, 0.2);
+	const vec3 auroraDark = vec3(0., 0.5, 0.5);
+	const vec3 auroraBright = vec3(0., 0.5, .0);
+
+	return vec4(
+		mix(auroraDark, auroraBright, cloudsKey.b) * cloudsKey.b * max(0., 1. - cloudsKey.r) + 
+		cloudsKey.r * (darkColor * max(0., 1. - cloudsKey.g) + dayLight * cloudsKey.g),
+	cloudsKey.r);
+}
+
+vec4 getClouds(vec2 uv) {
+	return
+		sampleClouds(uv - texelSize0 * vec2(-1.0, -1.0)) / 9.0 +
+		sampleClouds(uv - texelSize0 * vec2( 0.0, -1.0)) / 9.0 +
+		sampleClouds(uv - texelSize0 * vec2( 1.0, -1.0)) / 9.0 +
+		sampleClouds(uv - texelSize0 * vec2(-1.0,  0.0)) / 9.0 +
+		sampleClouds(uv - texelSize0 * vec2( 0.0,  0.0)) / 9.0 +
+		sampleClouds(uv - texelSize0 * vec2( 1.0,  0.0)) / 9.0 +
+		sampleClouds(uv - texelSize0 * vec2(-1.0,  1.0)) / 9.0 +
+		sampleClouds(uv - texelSize0 * vec2( 0.0,  1.0)) / 9.0 +
+		sampleClouds(uv - texelSize0 * vec2( 1.0,  1.0)) / 9.0;
+}
+
+void main(void)
+{
+	vec4 cloudsColor = getClouds(screenspaceCoordinate * 0.5 + 0.5);
+	vec4 sceneColor = texture2D(sceneTexture, screenspaceCoordinate * 0.5 + 0.5);
+
+	gl_FragColor = vec4(sceneColor.rgb * (1. - cloudsColor.a) + cloudsColor.rgb, 1.);
+}

client/shaders/clouds_merge/opengl_vertex.glsl

@@ -0,0 +1,7 @@
+varying vec2 screenspaceCoordinate;
+
+void main(void)
+{
+	screenspaceCoordinate = inVertexPosition.xy;
+	gl_Position = inVertexPosition;
+}

client/shaders/coarse_noise_shader/opengl_fragment.glsl

@@ -0,0 +1,17 @@
+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

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

client/shaders/noise_shader/opengl_fragment.glsl

@@ -0,0 +1,15 @@
+// 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

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

client/shaders/second_stage/opengl_fragment.glsl

@@ -163,7 +163,7 @@ void main(void)
 		// Filter out blue pixels, because the color grading tends to wash them out.
 		float blue_factor = clamp((color.b - max(color.r, color.g)) / max(0.01, min(color.r, color.g)), 0.0, 1.0);
 
-		color.rgb = mix(color.rgb, pow(color.rgb * slope, power), pow(1. - blue_factor, 4.));
+		color.rgb = mix(color.rgb, pow(color.rgb * slope, power), 1.);
 #endif
 		color.rgb = applySaturation(color.rgb, saturation);
 	}

client/shaders/volumetric_clouds/opengl_fragment.glsl

@@ -0,0 +1,182 @@
+#define depthmap texture0
+#define noiseTexture texture1
+#define noiseTextureCoarse texture2
+
+#define ITERATIONS 50
+#define LIGHT_ITERATIONS 10
+#define LIGHT_DISTANCE 100.
+#define AURORA_ITERATIONS 100
+
+uniform sampler2D depthmap;
+uniform sampler2D noiseTexture;
+uniform sampler2D noiseTextureCoarse;
+
+uniform vec2 texelSize0;
+
+uniform float cloudHeight;
+uniform float cloudThickness;
+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;
+
+varying vec2 screenspaceCoordinate;
+
+uniform float fogDistance;
+uniform float fogShadingParameter;
+
+uniform vec3 v_LightDirection;
+
+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) {
+	// 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);
+
+	return dither;
+}
+
+// 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);
+}
+
+float getDepth(vec2 screenspacePosition) {
+	float depth = texture2D(depthmap, screenspacePosition * 0.5 + 0.5).r;
+	return cameraNear * cameraFar / (cameraFar + depth * (cameraNear - cameraFar));
+}
+
+float getRawDepth(vec2 screenspacePosition) {
+	return texture2D(depthmap, screenspacePosition * 0.5 + 0.5).r;
+}
+
+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) {
+    return noise(p * 4.) * 0.5 + noise(p * 8.) * 0.25;
+}
+
+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 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.);
+}
+
+float getDensity(vec3 position) {
+	float density = texture2D(noiseTextureCoarse, position.xz / 2560. / 16.).r *
+		mtsmoothstep(0.0, cloudThickness * 0.2, position.y - cloudHeight) *
+		(1.0 - mtsmoothstep(cloudThickness * 0.5, cloudThickness, position.y - cloudHeight));
+
+	density = max(0., density - 0.5 * fnoise(position * 0.005));
+
+	return 0.04 * density;
+}
+
+float getBrightness(vec3 position, float bias) {
+	float density = 0.;
+	for (int i = 0; i < LIGHT_ITERATIONS; i++) {
+		vec3 rayPosition = position - v_LightDirection * LIGHT_DISTANCE * (float(i) + bias) / float(LIGHT_ITERATIONS);
+
+		density += getDensity(rayPosition) * float(LIGHT_DISTANCE) / float(LIGHT_ITERATIONS);
+	}
+	return exp(-density);
+}
+
+float blend(float A, float B, float alphaA, float alphaB) {
+    float alphaC = alphaA + (1. - alphaA) * alphaB;
+    return (alphaA * A + (1. - alphaA) * alphaB * B) / alphaC;
+}
+
+void main(void)
+{
+	vec3 viewVec = normalize(relativePosition);
+
+	vec3 position = cameraOffset + eyePosition;
+
+	float depth = getDepth(screenspaceCoordinate) / normalize(viewDirection).z;
+	float bottomPlaneIntersect = clamp(min((cloudHeight - eyePosition.y) / viewVec.y, depth), 0., 4. * fogDistance);
+	float topPlaneIntersect = clamp(min((cloudHeight + cloudThickness - eyePosition.y) / viewVec.y, depth), 0., 4. * fogDistance);
+
+	float startDepth = min(bottomPlaneIntersect, topPlaneIntersect);
+	float endDepth = max(bottomPlaneIntersect, topPlaneIntersect);
+
+	float bias = screenSpaceDither(gl_FragCoord.xy + animationTimer * 2400.0);
+
+	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);
+
+	if (auroraEndDepth - auroraStartDepth > 0.1 && rawDepth >= 1.0) {
+		for (int i = 0; i < ITERATIONS; i++) {
+			vec3 rayPosition = viewVec * (auroraStartDepth + (auroraEndDepth - auroraStartDepth) * (float(i) + bias) / float(ITERATIONS));
+
+			float localDensity = getAuroraDensity(rayPosition);
+
+			localDensity *= 1.0 - mtsmoothstep(4.0, 8.0, length(rayPosition));
+
+			density += localDensity;
+		}
+	}
+
+	color.b = density * (auroraEndDepth - auroraStartDepth) / float(AURORA_ITERATIONS);
+
+	float sunlightContribution = 0.;
+	float alpha = 0.;
+	float outScatter = 2. * (dot(v_LightDirection, viewVec) * 0.5 + 0.5);
+	density = 0.;
+
+	for (int i = 0; i < ITERATIONS; i++) {
+		vec3 rayPosition = eyePosition + 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 brightness = getBrightness(rayPosition, bias) * exp(-outScatter * localDensity);
+		sunlightContribution = blend(sunlightContribution, brightness, 1. - exp(-density), 1. - exp(-localDensity));
+		alpha = blend(alpha, clarity, 1. - exp(-density), 1. - exp(-localDensity));
+
+		density += localDensity;
+
+		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;
+
+	gl_FragColor = vec4(color, 1.0);
+}

client/shaders/volumetric_clouds/opengl_vertex.glsl

@@ -0,0 +1,17 @@
+uniform mat4 mCameraProjInv;
+uniform mat4 mCameraView;
+uniform vec3 eyePosition;
+
+varying vec3 relativePosition;
+varying vec3 viewDirection;
+
+varying vec2 screenspaceCoordinate;
+
+void main(void)
+{
+	screenspaceCoordinate = inVertexPosition.xy;
+	vec4 p = mCameraProjInv * inVertexPosition;
+	viewDirection = p.xyz / p.w;
+	relativePosition = (p.xyz / p.w) * mat3(mCameraView);
+	gl_Position = inVertexPosition;
+}

src/client/clouds.cpp

@@ -28,7 +28,6 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "settings.h"
 #include <cmath>
 
-
 // Menu clouds are created later
 class Clouds;
 Clouds *g_menuclouds = NULL;
@@ -344,6 +343,7 @@ void Clouds::updateMesh()
 
 void Clouds::render()
 {
+#if 0
 	if (m_params.density <= 0.0f)
 		return; // no need to do anything
 
@@ -394,13 +394,7 @@ void Clouds::render()
 	// Restore fog settings
 	driver->setFog(fog_color, fog_type, fog_start, fog_end, fog_density,
 			fog_pixelfog, fog_rangefog);
-}
+#endif
-
-void Clouds::renderVolumetrics() {
-	video::IVideoDriver* driver = SceneManager->getVideoDriver();
-	v2u32 ss = driver->getScreenSize();
-	core::rect<s32> rect(0, 0, ss.X, ss.Y);
-	driver->draw2DRectangle(video::SColor(255, 255, 255, 255), rect);
 }
 
 void Clouds::step(float dtime)

src/client/clouds.h

@@ -52,8 +52,6 @@ public:
 
 	virtual void render();
 
-	void renderVolumetrics();
-
 	virtual const aabb3f &getBoundingBox() const
 	{
 		return m_box;
@@ -93,6 +91,10 @@ public:
 		invalidateMesh();
 	}
 
+	float getDensity() const {
+		return m_params.density;
+	}
+
 	void setColorBright(video::SColor color_bright)
 	{
 		m_params.color_bright = color_bright;
@@ -112,6 +114,10 @@ public:
 		invalidateMesh();
 	}
 
+	float getHeight() const {
+		return m_params.height;
+	}
+
 	void setSpeed(v2f speed)
 	{
 		m_params.speed = speed;
@@ -126,6 +132,10 @@ public:
 		invalidateMesh();
 	}
 
+	float getThickness() const {
+		return m_params.thickness;
+	}
+
 	bool isCameraInsideCloud() const { return m_camera_inside_cloud; }
 
 	const video::SColor getColor() const { return m_color.toSColor(); }
@@ -147,7 +157,7 @@ private:
 
 	bool gridFilled(int x, int y) const;
 
-	video::SMaterial m_volume_material;
+	video::ITexture *m_density_texture = nullptr;
 
 	video::SMaterial m_material;
 	irr_ptr<scene::SMeshBuffer> m_meshbuffer;

src/client/game.cpp

@@ -383,9 +383,18 @@ 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_position_pixel{"cameraPosition"};
+	CachedVertexShaderSetting<float, 16> m_camera_projinv_vertex{"mCameraProjInv"};
+	CachedPixelShaderSetting<float, 16> m_camera_projinv_pixel{"mCameraProjInv"};
+	CachedVertexShaderSetting<float, 16> m_camera_view_vertex{"mCameraView"};
+	CachedPixelShaderSetting<float, 16> m_camera_view_pixel{"mCameraView"};
+	CachedPixelShaderSetting<float> m_camera_near_pixel{"cameraNear"};
+	CachedPixelShaderSetting<float> m_camera_far_pixel{"cameraFar"};
 	CachedPixelShaderSetting<SamplerLayer_t> m_texture0{"texture0"};
 	CachedPixelShaderSetting<SamplerLayer_t> m_texture1{"texture1"};
 	CachedPixelShaderSetting<SamplerLayer_t> m_texture2{"texture2"};
@@ -408,6 +417,9 @@ class GameGlobalShaderConstantSetter : public IShaderConstantSetter
 	float m_bloom_strength;
 	CachedPixelShaderSetting<float> m_bloom_radius_pixel{"bloomRadius"};
 	float m_bloom_radius;
+	CachedPixelShaderSetting<float> m_cloud_height_pixel{"cloudHeight"};
+	CachedPixelShaderSetting<float> m_cloud_thickness_pixel{"cloudThickness"};
+	CachedPixelShaderSetting<float> m_cloud_density_pixel{"cloudDensity"};
 	CachedPixelShaderSetting<float> m_saturation_pixel{"saturation"};
 	float m_gamma;
 	CachedPixelShaderSetting<float> m_gamma_pixel{"gamma"};
@@ -489,6 +501,10 @@ 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);
@@ -498,6 +514,24 @@ public:
 		m_camera_offset_pixel.set(offset, services);
 		m_camera_offset_vertex.set(offset, services);
 
+		v3f camera_position = m_client->getCamera()->getPosition();
+		m_camera_position_pixel.set(camera_position, services);
+
+		core::matrix4 camera_proj = m_client->getCamera()->getCameraNode()->getProjectionMatrix();
+		core::matrix4 camera_projinv;
+		camera_proj.getInverse(camera_projinv);
+		m_camera_projinv_vertex.set(camera_projinv, services);
+		m_camera_projinv_pixel.set(camera_projinv, services);
+
+		core::matrix4 camera_view = m_client->getCamera()->getCameraNode()->getViewMatrix();
+		m_camera_view_vertex.set(camera_view, services);
+		m_camera_view_pixel.set(camera_view, services);
+
+		float camera_near = m_client->getCamera()->getCameraNode()->getNearValue();
+		m_camera_near_pixel.set(&camera_near, services);
+		float camera_far = m_client->getCamera()->getCameraNode()->getFarValue();
+		m_camera_far_pixel.set(&camera_far, services);
+
 		SamplerLayer_t tex_id;
 		tex_id = 0;
 		m_texture0.set(&tex_id, services);
@@ -537,6 +571,17 @@ public:
 		video::SColorf artificial_light = lighting.artificial_light_color;
 		m_artificial_light.set(artificial_light, services);
 
+		// TODO: settings
+		Clouds* clouds = m_client->getClouds();
+		if (m_client->getClouds()) {
+			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);
+		}
+
 		if (m_volumetric_light_enabled) {
 			// Map directional light to screen space
 			auto camera_node = m_client->getCamera()->getCameraNode();

src/client/render/plain.cpp

@@ -66,11 +66,6 @@ void DrawHUD::run(PipelineContext &context)
 		context.client->getCamera()->drawNametags();
 	}
 	context.device->getGUIEnvironment()->drawAll();
-
-	// TODO: proper settings
-	if (true && context.client->getClouds()) {
-		context.client->getClouds()->renderVolumetrics();
-	}
 }
 
 

src/client/render/secondstage.cpp

@@ -25,6 +25,65 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "client/tile.h"
 #include "settings.h"
 
+class NoiseStep : public RenderStep {
+public:
+	NoiseStep(u32 shader_id, u8 texture_id) :
+		shader_id(shader_id), texture_id(texture_id)
+	{
+		material.UseMipMaps = false;
+		material.ZBuffer = true;
+		material.ZWriteEnable = video::EZW_ON;
+	}
+
+	void setRenderSource(RenderSource* _source) override {
+		source = _source;
+	}
+
+	void setRenderTarget(RenderTarget* _target) override {
+		target = _target;
+	}
+
+	void reset(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
+			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;
+	u8 texture_id;
+	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) :
 	shader_id(_shader_id), texture_map(_texture_map)
 {
@@ -65,7 +124,6 @@ void PostProcessingStep::run(PipelineContext &context)
 	if (target)
 		target->activate(context);
 
-	// attach the shader
 	material.MaterialType = context.client->getShaderSource()->getShaderInfo(shader_id).material;
 
 	auto driver = context.device->getVideoDriver();
@@ -96,6 +154,12 @@ void PostProcessingStep::setBilinearFilter(u8 index, bool value)
 	material.TextureLayers[index].MagFilter = value ? video::ETMAGF_LINEAR : video::ETMAGF_NEAREST;
 }
 
+void PostProcessingStep::setWrapRepeat(u8 index, bool value) {
+	assert(index < video::MATERIAL_MAX_TEXTURES);
+	material.TextureLayers[index].TextureWrapU = value ? video::ETC_REPEAT : video::ETC_CLAMP_TO_EDGE;
+	material.TextureLayers[index].TextureWrapV = value ? video::ETC_REPEAT : video::ETC_CLAMP_TO_EDGE;
+}
+
 RenderStep *addPostProcessing(RenderPipeline *pipeline, RenderStep *previousStep, v2f scale, Client *client)
 {
 	auto buffer = pipeline->createOwned<TextureBuffer>();
@@ -121,8 +185,13 @@ RenderStep *addPostProcessing(RenderPipeline *pipeline, RenderStep *previousStep
 	static const u8 TEXTURE_EXPOSURE_2 = 4;
 	static const u8 TEXTURE_FXAA = 5;
 	static const u8 TEXTURE_VOLUME = 6;
-	static const u8 TEXTURE_SCALE_DOWN = 10;
+	static const u8 TEXTURE_CLOUDS_1 = 7;
-	static const u8 TEXTURE_SCALE_UP = 20;
+	static const u8 TEXTURE_CLOUDS_2 = 8;
+	static const u8 TEXTURE_CLOUD_DENSITY = 9;
+	static const u8 TEXTURE_NOISE = 10;
+	static const u8 TEXTURE_NOISE_COARSE = 11;
+	static const u8 TEXTURE_SCALE_DOWN = 20;
+	static const u8 TEXTURE_SCALE_UP = 30;
 
 	// Super-sampling is simply rendering into a larger texture.
 	// Downscaling is done by the final step when rendering to the screen.
@@ -132,6 +201,8 @@ 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: Add clouds setting
 
 	if (enable_ssaa) {
 		u16 ssaa_scale = MYMAX(2, g_settings->getU16("fsaa"));
@@ -152,10 +223,47 @@ RenderStep *addPostProcessing(RenderPipeline *pipeline, RenderStep *previousStep
 	// Number of mipmap levels of the bloom downsampling texture
 	const u8 MIPMAP_LEVELS = 4;
 
-
 	// post-processing stage
 
 	u8 source = TEXTURE_COLOR;
+	
+	if (enable_volumetric_clouds) {
+		buffer->setTexture(TEXTURE_NOISE, core::dimension2du(256, 256), "noise", color_format);
+
+		shader_id = client->getShaderSource()->getShader("noise_shader", TILE_MATERIAL_PLAIN, NDT_MESH);
+		RenderStep *noise_step = pipeline->addStep<NoiseStep>(shader_id, TEXTURE_NOISE);
+		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);
+
+		shader_id = client->getShaderSource()->getShader("coarse_noise_shader", TILE_MATERIAL_PLAIN, NDT_MESH);
+		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);
+
+		shader_id = client->getShaderSource()->getShader("volumetric_clouds", TILE_MATERIAL_PLAIN, NDT_MESH);
+		PostProcessingStep *volumetric_clouds = pipeline->addStep<PostProcessingStep>(shader_id, std::vector<u8> { TEXTURE_DEPTH, TEXTURE_NOISE, TEXTURE_NOISE_COARSE });
+		volumetric_clouds->setRenderSource(buffer);
+		volumetric_clouds->setRenderTarget(pipeline->createOwned<TextureBufferOutput>(buffer, TEXTURE_CLOUDS_1));
+		volumetric_clouds->setBilinearFilter(1, true);
+		volumetric_clouds->setBilinearFilter(2, true);
+		volumetric_clouds->setWrapRepeat(1, true);
+		volumetric_clouds->setWrapRepeat(2, true);
+
+		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 });
+		blend_clouds->setRenderSource(buffer);
+		blend_clouds->setRenderTarget(pipeline->createOwned<TextureBufferOutput>(buffer, TEXTURE_CLOUDS_2));
+		blend_clouds->setBilinearFilter(0, true);
+
+		source = TEXTURE_CLOUDS_2;
+	}
 
 	// common downsampling step for bloom or autoexposure
 	if (enable_bloom || enable_auto_exposure) {
@@ -173,7 +281,7 @@ RenderStep *addPostProcessing(RenderPipeline *pipeline, RenderStep *previousStep
 
 			// get bright spots
 			u32 shader_id = client->getShaderSource()->getShader("extract_bloom", TILE_MATERIAL_PLAIN, NDT_MESH);
-			RenderStep *extract_bloom = pipeline->addStep<PostProcessingStep>(shader_id, std::vector<u8> { source, TEXTURE_EXPOSURE_1 });
+			auto 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;
@@ -224,7 +332,7 @@ RenderStep *addPostProcessing(RenderPipeline *pipeline, RenderStep *previousStep
 	}
 
 	// FXAA
-	u8 final_stage_source = TEXTURE_COLOR;
+	u8 final_stage_source = TEXTURE_CLOUDS_2;
 
 	if (enable_fxaa) {
 		final_stage_source = TEXTURE_FXAA;

src/client/render/secondstage.h

@@ -49,6 +49,9 @@ public:
 	 * @param value true to enable the bilinear filter, false to disable
 	 */
 	void setBilinearFilter(u8 index, bool value);
+
+	void setWrapRepeat(u8 index, bool value);
+
 private:
 	u32 shader_id;
 	std::vector<u8> texture_map;