From e59877f897b7139da88cfbd3151c38f605a75d74 Mon Sep 17 00:00:00 2001
From: "Mr.doob" <info@mrdoob.com>
Date: Fri, 10 Mar 2017 11:25:42 -0800
Subject: [PATCH] Added ArrayCamera. See #10927.

---
 src/Three.js                   |  1 +
 src/cameras/ArrayCamera.js     | 25 ++++++++++++++
 src/renderers/WebGLRenderer.js | 59 ++++++++++++++++++++++++++++------
 3 files changed, 76 insertions(+), 9 deletions(-)
 create mode 100644 src/cameras/ArrayCamera.js

diff --git a/src/Three.js b/src/Three.js
index c3f572e76e..86c86576d9 100644
--- a/src/Three.js
+++ b/src/Three.js
@@ -61,6 +61,7 @@ export { StereoCamera } from './cameras/StereoCamera.js';
 export { PerspectiveCamera } from './cameras/PerspectiveCamera.js';
 export { OrthographicCamera } from './cameras/OrthographicCamera.js';
 export { CubeCamera } from './cameras/CubeCamera.js';
+export { ArrayCamera } from './cameras/ArrayCamera.js';
 export { Camera } from './cameras/Camera.js';
 export { AudioListener } from './audio/AudioListener.js';
 export { PositionalAudio } from './audio/PositionalAudio.js';
diff --git a/src/cameras/ArrayCamera.js b/src/cameras/ArrayCamera.js
new file mode 100644
index 0000000000..8b98f7a59c
--- /dev/null
+++ b/src/cameras/ArrayCamera.js
@@ -0,0 +1,25 @@
+/**
+ * @author mrdoob / http://mrdoob.com/
+ */
+
+import { PerspectiveCamera } from './PerspectiveCamera';
+
+function ArrayCamera( array ) {
+
+	PerspectiveCamera.call( this );
+
+	this.enabled = false;
+	this.cameras = array || [];
+
+}
+
+ArrayCamera.prototype = Object.assign( Object.create( PerspectiveCamera.prototype ), {
+
+	constructor: ArrayCamera,
+
+	isArrayCamera: true
+
+} );
+
+
+export { ArrayCamera };
diff --git a/src/renderers/WebGLRenderer.js b/src/renderers/WebGLRenderer.js
index 558f76f5bd..451f9fcbe6 100644
--- a/src/renderers/WebGLRenderer.js
+++ b/src/renderers/WebGLRenderer.js
@@ -1060,6 +1060,8 @@ function WebGLRenderer( parameters ) {
 
 		// update camera matrices and frustum
 
+		camera.onBeforeRender( _this );
+
 		if ( camera.parent === null ) camera.updateMatrixWorld();
 
 		camera.matrixWorldInverse.getInverse( camera.matrixWorld );
@@ -1236,6 +1238,14 @@ function WebGLRenderer( parameters ) {
 		state.buffers.depth.setMask( true );
 		state.buffers.color.setMask( true );
 
+		if ( camera.isArrayCamera && camera.enabled ) {
+
+			_this.setScissorTest( false );
+
+		}
+
+		camera.onAfterRender( _this );
+
 		// _gl.finish();
 
 	};
@@ -1402,22 +1412,30 @@ function WebGLRenderer( parameters ) {
 
 			object.onBeforeRender( _this, scene, camera, geometry, material, group );
 
-			object.modelViewMatrix.multiplyMatrices( camera.matrixWorldInverse, object.matrixWorld );
-			object.normalMatrix.getNormalMatrix( object.modelViewMatrix );
+			if ( camera.isArrayCamera && camera.enabled ) {
 
-			if ( object.isImmediateRenderObject ) {
+				var cameras = camera.cameras;
 
-				state.setMaterial( material );
+				for ( var j = 0, jl = cameras.length; j < jl; j ++ ) {
 
-				var program = setProgram( camera, scene.fog, material, object );
+					var camera2 = cameras[ j ];
+					var bounds = camera2.bounds;
+					_this.setViewport(
+						bounds.x * _width * _pixelRatio, bounds.y * _height * _pixelRatio,
+						bounds.z * _width * _pixelRatio, bounds.w * _height * _pixelRatio
+					);
+					_this.setScissor(
+						bounds.x * _width * _pixelRatio, bounds.y * _height * _pixelRatio,
+						bounds.z * _width * _pixelRatio, bounds.w * _height * _pixelRatio
+					);
+					_this.setScissorTest( true );
+					renderObject( object, scene, camera2, geometry, material, group );
 
-				_currentGeometryProgram = '';
-
-				renderObjectImmediate( object, program, material );
+				}
 
 			} else {
 
-				_this.renderBufferDirect( camera, scene.fog, geometry, material, object, group );
+				renderObject( object, scene, camera, geometry, material, group );
 
 			}
 
@@ -1427,6 +1445,29 @@ function WebGLRenderer( parameters ) {
 
 	}
 
+	function renderObject( object, scene, camera, geometry, material, group ) {
+
+		object.modelViewMatrix.multiplyMatrices( camera.matrixWorldInverse, object.matrixWorld );
+		object.normalMatrix.getNormalMatrix( object.modelViewMatrix );
+
+		if ( object.isImmediateRenderObject ) {
+
+			state.setMaterial( material );
+
+			var program = setProgram( camera, scene.fog, material, object );
+
+			_currentGeometryProgram = '';
+
+			renderObjectImmediate( object, program, material );
+
+		} else {
+
+			_this.renderBufferDirect( camera, scene.fog, geometry, material, object, group );
+
+		}
+
+	}
+
 	function initMaterial( material, fog, object ) {
 
 		var materialProperties = properties.get( material );
-- 
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