diff --git a/examples/jsm/shaders/GTAOShader.js b/examples/jsm/shaders/GTAOShader.js
index d6cc90d794fc5e..2ca4ef0f94ca80 100644
--- a/examples/jsm/shaders/GTAOShader.js
+++ b/examples/jsm/shaders/GTAOShader.js
@@ -91,8 +91,12 @@ const GTAOShader = {
 		#define FRAGMENT_OUTPUT vec4(vec3(ao), 1.)
 		#endif
 
-		vec3 getViewPosition(const in vec2 screenPosition, const in float depth) {
-			vec4 clipSpacePosition = vec4(vec3(screenPosition, depth) * 2.0 - 1.0, 1.0);
+		vec3 getViewPosition( const in vec2 screenPosition, const in float depth ) {
+			#ifdef USE_REVERSED_DEPTH_BUFFER
+				vec4 clipSpacePosition = vec4( vec2( screenPosition ) * 2.0 - 1.0, depth, 1.0 );
+			#else
+				vec4 clipSpacePosition = vec4( vec3( screenPosition, depth ) * 2.0 - 1.0, 1.0 );
+			#endif
 			vec4 viewSpacePosition = cameraProjectionMatrixInverse * clipSpacePosition;
 			return viewSpacePosition.xyz / viewSpacePosition.w;
 		}
@@ -154,10 +158,19 @@ const GTAOShader = {
 
 		void main() {
 			float depth = getDepth(vUv.xy);
-			if (depth >= 1.0) {
-				discard;
-				return;
-			}
+
+			#ifdef USE_REVERSED_DEPTH_BUFFER
+				if (depth <= 0.0) {
+					discard;
+					return;
+				}
+			#else
+				if (depth >= 1.0) {
+					discard;
+					return;
+				}
+			#endif
+			
 			vec3 viewPos = getViewPosition(vUv, depth);
 			vec3 viewNormal = getViewNormal(vUv);
 
diff --git a/examples/jsm/shaders/PoissonDenoiseShader.js b/examples/jsm/shaders/PoissonDenoiseShader.js
index 0a3a7bf138414d..ff3e45feb6d75d 100644
--- a/examples/jsm/shaders/PoissonDenoiseShader.js
+++ b/examples/jsm/shaders/PoissonDenoiseShader.js
@@ -86,8 +86,12 @@ const PoissonDenoiseShader = {
 
 		const vec3 poissonDisk[SAMPLES] = SAMPLE_VECTORS;
 
-		vec3 getViewPosition(const in vec2 screenPosition, const in float depth) {
-			vec4 clipSpacePosition = vec4(vec3(screenPosition, depth) * 2.0 - 1.0, 1.0);
+		vec3 getViewPosition( const in vec2 screenPosition, const in float depth ) {
+			#ifdef USE_REVERSED_DEPTH_BUFFER
+				vec4 clipSpacePosition = vec4( vec2( screenPosition ) * 2.0 - 1.0, depth, 1.0 );
+			#else
+				vec4 clipSpacePosition = vec4( vec3( screenPosition, depth ) * 2.0 - 1.0, 1.0 );
+			#endif
 			vec4 viewSpacePosition = cameraProjectionMatrixInverse * clipSpacePosition;
 			return viewSpacePosition.xyz / viewSpacePosition.w;
 		}
diff --git a/examples/jsm/shaders/SAOShader.js b/examples/jsm/shaders/SAOShader.js
index 7ee8330457d08d..e3e2d9425a6c48 100644
--- a/examples/jsm/shaders/SAOShader.js
+++ b/examples/jsm/shaders/SAOShader.js
@@ -86,17 +86,6 @@ const SAOShader = {
 
 		#include <packing>
 
-		#ifdef USE_REVERSED_DEPTH_BUFFER
-
-			const float depthThreshold = 0.0 + EPSILON;
-
-		#else
-
-			const float depthThreshold = 1.0 - EPSILON;
-
-		#endif
-
-
 		vec4 getDefaultColor( const in vec2 screenPosition ) {
 			#if DIFFUSE_TEXTURE == 1
 			return texture2D( tDiffuse, vUv );
@@ -164,9 +153,15 @@ const SAOShader = {
 				angle += ANGLE_STEP;
 
 				float sampleDepth = getDepth( sampleUv );
-				if( sampleDepth >= depthThreshold ) {
+				#ifdef USE_REVERSED_DEPTH_BUFFER
+				if( sampleDepth <= 0.0 + EPSILON ) {
 					continue;
 				}
+				#else
+					if( sampleDepth >= 1.0 - EPSILON ) {
+						continue;
+					}
+				#endif
 
 				float sampleViewZ = getViewZ( sampleDepth );
 				vec3 sampleViewPosition = getViewPosition( sampleUv, sampleDepth, sampleViewZ );
@@ -181,9 +176,16 @@ const SAOShader = {
 
 		void main() {
 			float centerDepth = getDepth( vUv );
-			if( centerDepth >= depthThreshold ) {
-				discard;
-			}
+			
+			#ifdef USE_REVERSED_DEPTH_BUFFER
+				if( centerDepth <= 0.0 + EPSILON ) {
+					discard;
+				}
+			#else
+				if( centerDepth >= 1.0 - EPSILON ) {
+					discard;
+				}
+			#endif
 
 			float centerViewZ = getViewZ( centerDepth );
 			vec3 viewPosition = getViewPosition( vUv, centerDepth, centerViewZ );
diff --git a/src/cameras/CubeCamera.js b/src/cameras/CubeCamera.js
index 9ba288946ed9e1..afaae16a8069a0 100644
--- a/src/cameras/CubeCamera.js
+++ b/src/cameras/CubeCamera.js
@@ -203,19 +203,27 @@ class CubeCamera extends Object3D {
 
 		renderTarget.texture.generateMipmaps = false;
 
+		// https://github.com/mrdoob/three.js/issues/31413#issuecomment-3095966812
+		const reversedDepthBuffer = !! ( renderer.isWebGLRenderer && renderer.state.buffers.depth.getReversed() );
+
 		renderer.setRenderTarget( renderTarget, 0, activeMipmapLevel );
+		if ( reversedDepthBuffer && renderer.autoClear === false ) renderer.clearDepth();
 		renderer.render( scene, cameraPX );
 
 		renderer.setRenderTarget( renderTarget, 1, activeMipmapLevel );
+		if ( reversedDepthBuffer && renderer.autoClear === false ) renderer.clearDepth();
 		renderer.render( scene, cameraNX );
 
 		renderer.setRenderTarget( renderTarget, 2, activeMipmapLevel );
+		if ( reversedDepthBuffer && renderer.autoClear === false ) renderer.clearDepth();
 		renderer.render( scene, cameraPY );
 
 		renderer.setRenderTarget( renderTarget, 3, activeMipmapLevel );
+		if ( reversedDepthBuffer && renderer.autoClear === false ) renderer.clearDepth();
 		renderer.render( scene, cameraNY );
 
 		renderer.setRenderTarget( renderTarget, 4, activeMipmapLevel );
+		if ( reversedDepthBuffer && renderer.autoClear === false ) renderer.clearDepth();
 		renderer.render( scene, cameraPZ );
 
 		// mipmaps are generated during the last call of render()
@@ -224,6 +232,7 @@ class CubeCamera extends Object3D {
 		renderTarget.texture.generateMipmaps = generateMipmaps;
 
 		renderer.setRenderTarget( renderTarget, 5, activeMipmapLevel );
+		if ( reversedDepthBuffer && renderer.autoClear === false ) renderer.clearDepth();
 		renderer.render( scene, cameraNZ );
 
 		renderer.setRenderTarget( currentRenderTarget, currentActiveCubeFace, currentActiveMipmapLevel );
diff --git a/src/core/Clock.js b/src/core/Clock.js
index 5b3966f2ecf356..fc0f5e04620693 100644
--- a/src/core/Clock.js
+++ b/src/core/Clock.js
@@ -1,11 +1,16 @@
+import { warn } from '../utils.js';
+
 /**
  * Class for keeping track of time.
+ *
+ * @deprecated since r183.
  */
 class Clock {
 
 	/**
 	 * Constructs a new clock.
 	 *
+	 * @deprecated since 183.
 	 * @param {boolean} [autoStart=true] - Whether to automatically start the clock when
 	 * `getDelta()` is called for the first time.
 	 */
@@ -53,6 +58,8 @@ class Clock {
 		 */
 		this.running = false;
 
+		warn( 'THREE.Clock: This module has been deprecated. Please use THREE.Timer instead.' ); // @deprecated, r183
+
 	}
 
 	/**
diff --git a/src/renderers/webgl/WebGLState.js b/src/renderers/webgl/WebGLState.js
index c49d48eff668be..674efa16a80fdd 100644
--- a/src/renderers/webgl/WebGLState.js
+++ b/src/renderers/webgl/WebGLState.js
@@ -214,6 +214,8 @@ function WebGLState( gl, extensions ) {
 
 				if ( currentDepthClear !== depth ) {
 
+					currentDepthClear = depth;
+
 					if ( currentReversed ) {
 
 						depth = 1 - depth;
@@ -221,7 +223,6 @@ function WebGLState( gl, extensions ) {
 					}
 
 					gl.clearDepth( depth );
-					currentDepthClear = depth;
 
 				}