gpgpu_water example: Use renderer.readRenderTargetPixels

examples/webgl_gpgpu_water.html

@@ -646,11 +646,9 @@
 						var v = 1 - ( 0.5 * sphere.position.z / BOUNDS_HALF + 0.5 );
 						readWaterLevelShader.uniforms[ "point1" ].value.set( u, v );
 						gpuCompute.doRenderTarget( readWaterLevelShader, readWaterLevelRenderTarget );
-						var previousRenderTarget = renderer.getRenderTarget();
-						renderer.setRenderTarget( readWaterLevelRenderTarget );
-						gl.readPixels( 0, 0, 4, 1, gl.RGBA, gl.UNSIGNED_BYTE, readWaterLevelImage );
+
+						renderer.readRenderTargetPixels( readWaterLevelRenderTarget, 0, 0, 4, 1, readWaterLevelImage );
 						var pixels = new Float32Array( readWaterLevelImage.buffer );
-						renderer.setRenderTarget( previousRenderTarget );
 
 						// Get orientation
 						waterNormal.set( pixels[ 1 ], 0, - pixels[ 2 ] );