最新代码

public/sdk/three/jsm/utils/TextureUtils.js

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+import {
+	PlaneGeometry,
+	ShaderMaterial,
+	Uniform,
+	Mesh,
+	PerspectiveCamera,
+	Scene,
+	WebGLRenderer,
+	CanvasTexture,
+	SRGBColorSpace
+} from 'three';
+
+let _renderer;
+let fullscreenQuadGeometry;
+let fullscreenQuadMaterial;
+let fullscreenQuad;
+
+export function decompress( texture, maxTextureSize = Infinity, renderer = null ) {
+
+	if ( ! fullscreenQuadGeometry ) fullscreenQuadGeometry = new PlaneGeometry( 2, 2, 1, 1 );
+	if ( ! fullscreenQuadMaterial ) fullscreenQuadMaterial = new ShaderMaterial( {
+		uniforms: { blitTexture: new Uniform( texture ) },
+		vertexShader: `
+			varying vec2 vUv;
+			void main(){
+				vUv = uv;
+				gl_Position = vec4(position.xy * 1.0,0.,.999999);
+			}`,
+		fragmentShader: `
+			uniform sampler2D blitTexture; 
+			varying vec2 vUv;
+
+			void main(){ 
+				gl_FragColor = vec4(vUv.xy, 0, 1);
+				
+				#ifdef IS_SRGB
+				gl_FragColor = LinearTosRGB( texture2D( blitTexture, vUv) );
+				#else
+				gl_FragColor = texture2D( blitTexture, vUv);
+				#endif
+			}`
+	} );
+
+	fullscreenQuadMaterial.uniforms.blitTexture.value = texture;
+	fullscreenQuadMaterial.defines.IS_SRGB = texture.colorSpace == SRGBColorSpace;
+	fullscreenQuadMaterial.needsUpdate = true;
+
+	if ( ! fullscreenQuad ) {
+
+		fullscreenQuad = new Mesh( fullscreenQuadGeometry, fullscreenQuadMaterial );
+		fullscreenQuad.frustumCulled = false;
+
+	}
+
+	const _camera = new PerspectiveCamera();
+	const _scene = new Scene();
+	_scene.add( fullscreenQuad );
+
+	if ( renderer === null ) {
+
+		renderer = _renderer = new WebGLRenderer( { antialias: false } );
+
+	}
+
+	const width = Math.min( texture.image.width, maxTextureSize );
+	const height = Math.min( texture.image.height, maxTextureSize );
+
+	renderer.setSize( width, height );
+	renderer.clear();
+	renderer.render( _scene, _camera );
+
+	const canvas = document.createElement( 'canvas' );
+	const context = canvas.getContext( '2d' );
+
+	canvas.width = width;
+	canvas.height = height;
+
+	context.drawImage( renderer.domElement, 0, 0, width, height );
+
+	const readableTexture = new CanvasTexture( canvas );
+
+	readableTexture.minFilter = texture.minFilter;
+	readableTexture.magFilter = texture.magFilter;
+	readableTexture.wrapS = texture.wrapS;
+	readableTexture.wrapT = texture.wrapT;
+	readableTexture.name = texture.name;
+
+	if ( _renderer ) {
+
+		_renderer.forceContextLoss();
+		_renderer.dispose();
+		_renderer = null;
+
+	}
+
+	return readableTexture;
+
+}