WebGLRenderer: Auto-correct reversed projection matrix (#31410)

* Auto-correct projection matrix

Author: WestLangley

src/renderers/WebGLRenderer.js

@@ -52,7 +52,7 @@ import { WebGLUtils } from './webgl/WebGLUtils.js';
 import { WebXRManager } from './webxr/WebXRManager.js';
 import { WebGLMaterials } from './webgl/WebGLMaterials.js';
 import { WebGLUniformsGroups } from './webgl/WebGLUniformsGroups.js';
-import { createCanvasElement, probeAsync, toNormalizedProjectionMatrix, toReversedProjectionMatrix, warnOnce } from '../utils.js';
+import { createCanvasElement, probeAsync, warnOnce } from '../utils.js';
 import { ColorManagement } from '../math/ColorManagement.js';
 
 /**
@@ -313,7 +313,6 @@ class WebGLRenderer {
 
 		// camera matrices cache
 
-		const _currentProjectionMatrix = new Matrix4();
 		const _projScreenMatrix = new Matrix4();
 
 		const _vector3 = new Vector3();
@@ -2384,22 +2383,13 @@ class WebGLRenderer {
 
 				if ( reversedDepthBuffer && camera.reversedDepth !== true ) {
 
-					// @deprecated, r179
-					warnOnce( 'THREE.WebGLRenderer: reversedDepthBuffer must be used with "camera.reversedDepth = true;" for correct results. Automatic conversion will be removed in r189.' );
-
-					_currentProjectionMatrix.copy( camera.projectionMatrix );
-
-					toNormalizedProjectionMatrix( _currentProjectionMatrix );
-					toReversedProjectionMatrix( _currentProjectionMatrix );
-
-					p_uniforms.setValue( _gl, 'projectionMatrix', _currentProjectionMatrix );
-
-				} else {
-
-					p_uniforms.setValue( _gl, 'projectionMatrix', camera.projectionMatrix );
+					camera.reversedDepth = true;
+					camera.updateProjectionMatrix();
 
 				}
 
+				p_uniforms.setValue( _gl, 'projectionMatrix', camera.projectionMatrix );
+
 				p_uniforms.setValue( _gl, 'viewMatrix', camera.matrixWorldInverse );
 
 				const uCamPos = p_uniforms.map.cameraPosition;