diff --git a/script.js b/script.js
index 5dab991..09ba773 100644
--- a/script.js
+++ b/script.js
@@ -1,9 +1,9 @@
 'use strict';
 
 const canvas = document.getElementsByTagName('canvas')[0];
-const params = { alpha: false, preserveDrawingBuffer: false, depth: false, stencil: false, antialias: false };
+const params = { alpha: false, depth: false, stencil: false, antialias: false };
 
-let gl = canvas.getContext('webgl2');
+let gl = canvas.getContext('webgl2', params);
 const isWebGL2 = !!gl;
 if (!isWebGL2) {
     gl = canvas.getContext('webgl', params) || canvas.getContext('experimental-webgl', params);
@@ -11,11 +11,14 @@ if (!isWebGL2) {
 gl.clearColor(0.0, 0.0, 0.0, 1.0);
 
 const halfFloat = gl.getExtension('OES_texture_half_float');
-const support_linear_float = gl.getExtension('OES_texture_half_float_linear');
+let support_linear_float = gl.getExtension('OES_texture_half_float_linear');
 if (isWebGL2) {
     gl.getExtension('EXT_color_buffer_float');
+    support_linear_float = gl.getExtension('OES_texture_float_linear');
 }
 
+gl.clearColor(0.0, 0.0, 0.0, 1.0);
+
 resizeCanvas();
 
 const TEXTURE_DOWNSAMPLE = 1;
@@ -373,7 +376,7 @@ let pressure   = createDoubleFBO(6, TEXTURE_WIDTH, TEXTURE_HEIGHT, internalForma
 
 const displayProgram = new GLProgram(baseVertexShader, displayShader);
 const splatProgram = new GLProgram(baseVertexShader, splatShader);
-const advectionProgram = new GLProgram(baseVertexShader, support_linear_float ? advectionShader : advectionManualFilteringShader);
+const advectionProgram = new GLProgram(baseVertexShader, advectionManualFilteringShader);
 const divergenceProgram = new GLProgram(baseVertexShader, divergenceShader);
 const curlProgram = new GLProgram(baseVertexShader, curlShader);
 const vorticityProgram = new GLProgram(baseVertexShader, vorticityShader);
@@ -543,4 +546,4 @@ function onPointerUp () {
     for (let i = 0; i < pointers.length; i++) {
         pointers[i].down = false;
     }
-}
+}
\ No newline at end of file