diff --git a/webgpu/lessons/webgpu-optimization.md b/webgpu/lessons/webgpu-optimization.md
index 8d696eb9..0eda2c32 100644
--- a/webgpu/lessons/webgpu-optimization.md
+++ b/webgpu/lessons/webgpu-optimization.md
@@ -274,14 +274,9 @@ const hsl = (h, s, l) => `hsl(${h * 360 | 0}, ${s * 100}%, ${l * 100 | 0}%)`;
 
 /**
  * Given hue, saturation, and luminance values in the range of 0 to 1
- * returns an array of values from 0 to 1
+ * returns an array of 4 values from 0 to 1
  */
 const hslToRGBA = (h, s, l) => cssColorToRGBA(hsl(h, s, l));
-/**
- * Given hue, saturation, and luminance values in the range of 0 to 1
- * returns an array of values from 0 to 255
- */
-const hslToRGBA8 = (h, s, l) => cssColorToRGBA8(hsl(h, s, l));
 
 /**
  * Returns a random number between min and max.
@@ -305,32 +300,31 @@ const randomArrayElement = arr => arr[Math.random() * arr.length | 0];
 
 Hopefully they are all pretty straight forward.
 
-Now let's make a texture and a sampler. The texture will
-just be a 2x2 texel texture with 4 shades of gray.
+Now let's make some textures and a sampler. We'll use
+a canvas, draw an emoji on it, and then use our function
+`createTextureFromSource` that we wrote in
+[the article on importing textures](webgpu-importing-textures.html)
+to create a texture from it.
 
 ```js
-  const texture = device.createTexture({
-    size: [2, 2],
-    format: 'rgba8unorm',
-    usage:
-      GPUTextureUsage.TEXTURE_BINDING |
-      GPUTextureUsage.COPY_DST,
+  const textures = [
+    '😂', '👾', '👍', '👀', '🌞', '🛟',
+  ].map(s => {
+    const size = 128;
+    const ctx = new OffscreenCanvas(size, size).getContext('2d');
+    ctx.fillStyle = '#fff';
+    ctx.fillRect(0, 0, size, size);
+    ctx.font = `${size * 0.9}px sans-serif`;
+    ctx.textAlign = 'center';
+    ctx.textBaseline = 'middle';
+    ctx.fillText(s, size / 2, size / 2);
+    return createTextureFromSource(device, ctx.canvas, {mips: true});
   });
-  device.queue.writeTexture(
-      { texture },
-      new Uint8Array([
-        ...hslToRGBA8(0, 0, 1),
-        ...hslToRGBA8(0, 0, 0.5),
-        ...hslToRGBA8(0, 0, 0.75),
-        ...hslToRGBA8(0, 0, 0.25),
-      ]),
-      { bytesPerRow: 8, rowsPerImage: 2 },
-      { width: 2, height: 2 },
-  );
 
   const sampler = device.createSampler({
-    magFilter: 'nearest',
-    minFilter: 'nearest',
+    magFilter: 'linear',
+    minFilter: 'linear',
+    mipmapFilter: 'nearest',
   });
 ```
 
@@ -350,7 +344,7 @@ We'll make 20 "materials" and then pick a material at random for each cube.
     materials.push({
       color,
       shininess,
-      texture,
+      texture: randomArrayElement(textures),
       sampler,
     });
   }
@@ -1580,7 +1574,7 @@ Then we'll make a uniform buffer for each material.
 -      color,
 -      shininess,
 +      materialUniformBuffer,
-      texture,
+      texture: randomArrayElement(textures),
       sampler,
     });
   }
diff --git a/webgpu/webgl-optimization-none-uniform-buffers.html b/webgpu/webgl-optimization-none-uniform-buffers.html
index ab103c0d..56cafeee 100644
--- a/webgpu/webgl-optimization-none-uniform-buffers.html
+++ b/webgpu/webgl-optimization-none-uniform-buffers.html
@@ -145,14 +145,9 @@
 
 /**
  * Given hue, saturation, and luminance values in the range of 0 to 1
- * returns an array of values from 0 to 1
+ * returns an array of 4 values from 0 to 1
  */
 const hslToRGBA = (h, s, l) => cssColorToRGBA(hsl(h, s, l));
-/**
- * Given hue, saturation, and luminance values in the range of 0 to 1
- * returns an array of values from 0 to 255
- */
-const hslToRGBA8 = (h, s, l) => cssColorToRGBA8(hsl(h, s, l));
 
 /**
  * Returns a random number between min and max.
@@ -278,17 +273,23 @@
   gl.enable(gl.CULL_FACE);
   gl.enable(gl.DEPTH_TEST);
 
-  const texture = twgl.createTexture(gl, {
-    format: gl.RGBA,
-    width: 2,
-    src: new Uint8Array([
-      ...hslToRGBA8(0, 0, 1),
-      ...hslToRGBA8(0, 0, 0.5),
-      ...hslToRGBA8(0, 0, 0.75),
-      ...hslToRGBA8(0, 0, 0.25),
-    ]),
-    minMag: gl.NEAREST,
-    wrap: gl.CLAMP_TO_EDGE,
+  const textures = [
+    '😂', '👾', '👍', '👀', '🌞', '🛟',
+  ].map(s => {
+    const size = 128;
+    const ctx = new OffscreenCanvas(size, size).getContext('2d');
+    ctx.fillStyle = '#fff';
+    ctx.fillRect(0, 0, size, size);
+    ctx.font = `${size * 0.9}px sans-serif`;
+    ctx.textAlign = 'center';
+    ctx.textBaseline = 'middle';
+    ctx.fillText(s, size / 2, size / 2);
+    return twgl.createTexture(gl, {
+      src: ctx.canvas,
+      wrap: gl.CLAMP_TO_EDGE,
+      min: gl.LINEAR_MIPMAP_NEAREST,
+      mag: gl.LINEAR,
+    });
   });
 
   const numMaterials = 20;
@@ -299,7 +300,7 @@
     materials.push({
       color,
       shininess,
-      texture,
+      texture: randomArrayElement(textures),
     });
   }
 
@@ -315,7 +316,7 @@
     const scale = rand(2, 10);
 
     const uniforms = {
-      diffuseTexture: texture,
+      diffuseTexture: randomArrayElement(textures),
     };
 
     const uboInfo = twgl.createUniformBlockInfo(gl, prgInfo, 'Uniforms');
@@ -375,7 +376,6 @@
     timingHelper.begin();
     gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
 
-
     gl.useProgram(prgInfo.program);
     twgl.setBuffersAndAttributes(gl, prgInfo, bufferInfo);
 
@@ -459,7 +459,6 @@
 gpu : ${(gpuAverage.get() / 1000 / 1000).toFixed(1)}ms
 `;
 
-
     requestAnimationFrame(render);
   }
   requestAnimationFrame(render);
diff --git a/webgpu/webgl-optimization-none.html b/webgpu/webgl-optimization-none.html
index 04c05c89..3148b3a4 100644
--- a/webgpu/webgl-optimization-none.html
+++ b/webgpu/webgl-optimization-none.html
@@ -145,14 +145,9 @@
 
 /**
  * Given hue, saturation, and luminance values in the range of 0 to 1
- * returns an array of values from 0 to 1
+ * returns an array of 4 values from 0 to 1
  */
 const hslToRGBA = (h, s, l) => cssColorToRGBA(hsl(h, s, l));
-/**
- * Given hue, saturation, and luminance values in the range of 0 to 1
- * returns an array of values from 0 to 255
- */
-const hslToRGBA8 = (h, s, l) => cssColorToRGBA8(hsl(h, s, l));
 
 /**
  * Returns a random number between min and max.
@@ -273,17 +268,23 @@
   gl.enable(gl.CULL_FACE);
   gl.enable(gl.DEPTH_TEST);
 
-  const texture = twgl.createTexture(gl, {
-    format: gl.RGBA,
-    width: 2,
-    src: new Uint8Array([
-      ...hslToRGBA8(0, 0, 1),
-      ...hslToRGBA8(0, 0, 0.5),
-      ...hslToRGBA8(0, 0, 0.75),
-      ...hslToRGBA8(0, 0, 0.25),
-    ]),
-    minMag: gl.NEAREST,
-    wrap: gl.CLAMP_TO_EDGE,
+  const textures = [
+    '😂', '👾', '👍', '👀', '🌞', '🛟',
+  ].map(s => {
+    const size = 128;
+    const ctx = new OffscreenCanvas(size, size).getContext('2d');
+    ctx.fillStyle = '#fff';
+    ctx.fillRect(0, 0, size, size);
+    ctx.font = `${size * 0.9}px sans-serif`;
+    ctx.textAlign = 'center';
+    ctx.textBaseline = 'middle';
+    ctx.fillText(s, size / 2, size / 2);
+    return twgl.createTexture(gl, {
+      src: ctx.canvas,
+      wrap: gl.CLAMP_TO_EDGE,
+      min: gl.LINEAR_MIPMAP_NEAREST,
+      mag: gl.LINEAR,
+    });
   });
 
   const numMaterials = 20;
@@ -294,7 +295,7 @@
     materials.push({
       color,
       shininess,
-      texture,
+      texture: randomArrayElement(textures),
     });
   }
 
@@ -317,7 +318,7 @@
       viewWorldPosition: vec3.create(),
       color: new Float32Array(4),
       shininess: 0,
-      diffuseTexture: texture,
+      diffuseTexture: randomArrayElement(textures),
     };
 
     objectInfos.push({
@@ -372,7 +373,6 @@
     timingHelper.begin();
     gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
 
-
     gl.useProgram(prgInfo.program);
     twgl.setBuffersAndAttributes(gl, prgInfo, bufferInfo);
 
@@ -453,7 +453,6 @@
 gpu : ${(gpuAverage.get() / 1000 / 1000).toFixed(1)}ms
 `;
 
-
     requestAnimationFrame(render);
   }
   requestAnimationFrame(render);
diff --git a/webgpu/webgpu-compute-shaders-histogram-4ch-optimized-16x16.html b/webgpu/webgpu-compute-shaders-histogram-4ch-optimized-16x16.html
index 0f6b2715..ef7333da 100644
--- a/webgpu/webgpu-compute-shaders-histogram-4ch-optimized-16x16.html
+++ b/webgpu/webgpu-compute-shaders-histogram-4ch-optimized-16x16.html
@@ -116,7 +116,6 @@
     `,
   });
 
-
   const histogramChunkPipeline = device.createComputePipeline({
     label: 'histogram',
     layout: 'auto',
@@ -222,7 +221,6 @@
   console.log('sum:', sum);
 }
 
-
 function showImageBitmap(imageBitmap) {
   const canvas = document.createElement('canvas');
 
diff --git a/webgpu/webgpu-compute-shaders-histogram-4ch-optimized-more-gpu-draw-w-timing.html b/webgpu/webgpu-compute-shaders-histogram-4ch-optimized-more-gpu-draw-w-timing.html
index 49931638..85efbbd2 100644
--- a/webgpu/webgpu-compute-shaders-histogram-4ch-optimized-more-gpu-draw-w-timing.html
+++ b/webgpu/webgpu-compute-shaders-histogram-4ch-optimized-more-gpu-draw-w-timing.html
@@ -205,7 +205,6 @@
     `,
   });
 
-
   const histogramChunkPipeline = device.createComputePipeline({
     label: 'histogram',
     layout: 'auto',
diff --git a/webgpu/webgpu-compute-shaders-histogram-4ch-optimized-more-w-timing.html b/webgpu/webgpu-compute-shaders-histogram-4ch-optimized-more-w-timing.html
index c1e25c81..9dfdd6f4 100644
--- a/webgpu/webgpu-compute-shaders-histogram-4ch-optimized-more-w-timing.html
+++ b/webgpu/webgpu-compute-shaders-histogram-4ch-optimized-more-w-timing.html
@@ -124,7 +124,6 @@
     `,
   });
 
-
   const histogramChunkPipeline = device.createComputePipeline({
     label: 'histogram',
     layout: 'auto',
diff --git a/webgpu/webgpu-compute-shaders-histogram-4ch-optimized-more.html b/webgpu/webgpu-compute-shaders-histogram-4ch-optimized-more.html
index 40603853..384097c1 100644
--- a/webgpu/webgpu-compute-shaders-histogram-4ch-optimized-more.html
+++ b/webgpu/webgpu-compute-shaders-histogram-4ch-optimized-more.html
@@ -115,7 +115,6 @@
     `,
   });
 
-
   const histogramChunkPipeline = device.createComputePipeline({
     label: 'histogram',
     layout: 'auto',
diff --git a/webgpu/webgpu-compute-shaders-histogram-4ch-optimized-w-timing.html b/webgpu/webgpu-compute-shaders-histogram-4ch-optimized-w-timing.html
index a4263826..f9d3cc91 100644
--- a/webgpu/webgpu-compute-shaders-histogram-4ch-optimized-w-timing.html
+++ b/webgpu/webgpu-compute-shaders-histogram-4ch-optimized-w-timing.html
@@ -118,7 +118,6 @@
     `,
   });
 
-
   const histogramChunkPipeline = device.createComputePipeline({
     label: 'histogram',
     layout: 'auto',
diff --git a/webgpu/webgpu-compute-shaders-histogram-4ch-optimized.html b/webgpu/webgpu-compute-shaders-histogram-4ch-optimized.html
index a7c40469..e087a6b5 100644
--- a/webgpu/webgpu-compute-shaders-histogram-4ch-optimized.html
+++ b/webgpu/webgpu-compute-shaders-histogram-4ch-optimized.html
@@ -114,7 +114,6 @@
     `,
   });
 
-
   const histogramChunkPipeline = device.createComputePipeline({
     label: 'histogram',
     layout: 'auto',
diff --git a/webgpu/webgpu-compute-shaders-histogram-optimized-16x16.html b/webgpu/webgpu-compute-shaders-histogram-optimized-16x16.html
index ca9abbc5..51a6c35c 100644
--- a/webgpu/webgpu-compute-shaders-histogram-optimized-16x16.html
+++ b/webgpu/webgpu-compute-shaders-histogram-optimized-16x16.html
@@ -116,7 +116,6 @@
     `,
   });
 
-
   const histogramChunkPipeline = device.createComputePipeline({
     label: 'histogram',
     layout: 'auto',
diff --git a/webgpu/webgpu-optimization-all.html b/webgpu/webgpu-optimization-all.html
index 88471889..a30a814b 100644
--- a/webgpu/webgpu-optimization-all.html
+++ b/webgpu/webgpu-optimization-all.html
@@ -44,6 +44,9 @@
   </body>
   <script type="module">
 import GUI from '../3rdparty/muigui-0.x.module.js';
+// see https://webgpufundamentals.org/webgpu/lessons/webgpu-utils.html#webgpu-utils
+import {createTextureFromSource} from '../3rdparty/webgpu-utils-1.x.module.js';
+// see https://webgpufundamentals.org/webgpu/lessons/webgpu-matrix-math.html
 import {mat4, mat3, vec3} from '../3rdparty/wgpu-matrix.module.js';
 // see https://webgpufundamentals.org/webgpu/lessons/webgpu-timing.html
 import TimingHelper from './resources/js/timing-helper.js';
@@ -78,14 +81,9 @@
 
 /**
  * Given hue, saturation, and luminance values in the range of 0 to 1
- * returns an array of values from 0 to 1
+ * returns an array of 4 values from 0 to 1
  */
 const hslToRGBA = (h, s, l) => cssColorToRGBA(hsl(h, s, l));
-/**
- * Given hue, saturation, and luminance values in the range of 0 to 1
- * returns an array of values from 0 to 255
- */
-const hslToRGBA8 = (h, s, l) => cssColorToRGBA8(hsl(h, s, l));
 
 /**
  * Returns a random number between min and max.
@@ -293,31 +291,26 @@
     },
   });
 
-  const texture = device.createTexture({
-    size: [2, 2],
-    format: 'rgba8unorm',
-    usage:
-      GPUTextureUsage.TEXTURE_BINDING |
-      GPUTextureUsage.COPY_DST,
+  const textures = [
+    '😂', '👾', '👍', '👀', '🌞', '🛟',
+  ].map(s => {
+    const size = 128;
+    const ctx = new OffscreenCanvas(size, size).getContext('2d');
+    ctx.fillStyle = '#fff';
+    ctx.fillRect(0, 0, size, size);
+    ctx.font = `${size * 0.9}px sans-serif`;
+    ctx.textAlign = 'center';
+    ctx.textBaseline = 'middle';
+    ctx.fillText(s, size / 2, size / 2);
+    return createTextureFromSource(device, ctx.canvas, {mips: true});
   });
-  device.queue.writeTexture(
-      { texture },
-      new Uint8Array([
-        ...hslToRGBA8(0, 0, 1),
-        ...hslToRGBA8(0, 0, 0.5),
-        ...hslToRGBA8(0, 0, 0.75),
-        ...hslToRGBA8(0, 0, 0.25),
-      ]),
-      { bytesPerRow: 8, rowsPerImage: 2 },
-      { width: 2, height: 2 },
-  );
 
   const sampler = device.createSampler({
-    magFilter: 'nearest',
-    minFilter: 'nearest',
+    magFilter: 'linear',
+    minFilter: 'linear',
+    mipmapFilter: 'nearest',
   });
 
-
   const numMaterials = 20;
   const materials = [];
   for (let i = 0; i < numMaterials; ++i) {
@@ -326,7 +319,7 @@
     materials.push({
       color,
       shininess,
-      texture,
+      texture: randomArrayElement(textures),
       sampler,
     });
   }
diff --git a/webgpu/webgpu-optimization-none.html b/webgpu/webgpu-optimization-none.html
index 77b26c65..9bbdc3fd 100644
--- a/webgpu/webgpu-optimization-none.html
+++ b/webgpu/webgpu-optimization-none.html
@@ -44,6 +44,9 @@
   </body>
   <script type="module">
 import GUI from '../3rdparty/muigui-0.x.module.js';
+// see https://webgpufundamentals.org/webgpu/lessons/webgpu-utils.html#webgpu-utils
+import {createTextureFromSource} from '../3rdparty/webgpu-utils-1.x.module.js';
+// see https://webgpufundamentals.org/webgpu/lessons/webgpu-matrix-math.html
 import {mat4, mat3, vec3} from '../3rdparty/wgpu-matrix.module.js';
 // see https://webgpufundamentals.org/webgpu/lessons/webgpu-timing.html
 import TimingHelper from './resources/js/timing-helper.js';
@@ -78,14 +81,9 @@
 
 /**
  * Given hue, saturation, and luminance values in the range of 0 to 1
- * returns an array of values from 0 to 1
+ * returns an array of 4 values from 0 to 1
  */
 const hslToRGBA = (h, s, l) => cssColorToRGBA(hsl(h, s, l));
-/**
- * Given hue, saturation, and luminance values in the range of 0 to 1
- * returns an array of values from 0 to 255
- */
-const hslToRGBA8 = (h, s, l) => cssColorToRGBA8(hsl(h, s, l));
 
 /**
  * Returns a random number between min and max.
@@ -278,28 +276,24 @@
     },
   });
 
-  const texture = device.createTexture({
-    size: [2, 2],
-    format: 'rgba8unorm',
-    usage:
-      GPUTextureUsage.TEXTURE_BINDING |
-      GPUTextureUsage.COPY_DST,
+  const textures = [
+    '😂', '👾', '👍', '👀', '🌞', '🛟',
+  ].map(s => {
+    const size = 128;
+    const ctx = new OffscreenCanvas(size, size).getContext('2d');
+    ctx.fillStyle = '#fff';
+    ctx.fillRect(0, 0, size, size);
+    ctx.font = `${size * 0.9}px sans-serif`;
+    ctx.textAlign = 'center';
+    ctx.textBaseline = 'middle';
+    ctx.fillText(s, size / 2, size / 2);
+    return createTextureFromSource(device, ctx.canvas, {mips: true});
   });
-  device.queue.writeTexture(
-      { texture },
-      new Uint8Array([
-        ...hslToRGBA8(0, 0, 1),
-        ...hslToRGBA8(0, 0, 0.5),
-        ...hslToRGBA8(0, 0, 0.75),
-        ...hslToRGBA8(0, 0, 0.25),
-      ]),
-      { bytesPerRow: 8, rowsPerImage: 2 },
-      { width: 2, height: 2 },
-  );
 
   const sampler = device.createSampler({
-    magFilter: 'nearest',
-    minFilter: 'nearest',
+    magFilter: 'linear',
+    minFilter: 'linear',
+    mipmapFilter: 'nearest',
   });
 
   const numMaterials = 20;
@@ -310,7 +304,7 @@
     materials.push({
       color,
       shininess,
-      texture,
+      texture: randomArrayElement(textures),
       sampler,
     });
   }
diff --git a/webgpu/webgpu-optimization-step3-global-vs-per-object-uniforms.html b/webgpu/webgpu-optimization-step3-global-vs-per-object-uniforms.html
index 320824df..c7798063 100644
--- a/webgpu/webgpu-optimization-step3-global-vs-per-object-uniforms.html
+++ b/webgpu/webgpu-optimization-step3-global-vs-per-object-uniforms.html
@@ -44,6 +44,9 @@
   </body>
   <script type="module">
 import GUI from '../3rdparty/muigui-0.x.module.js';
+// see https://webgpufundamentals.org/webgpu/lessons/webgpu-utils.html#webgpu-utils
+import {createTextureFromSource} from '../3rdparty/webgpu-utils-1.x.module.js';
+// see https://webgpufundamentals.org/webgpu/lessons/webgpu-matrix-math.html
 import {mat4, mat3, vec3} from '../3rdparty/wgpu-matrix.module.js';
 // see https://webgpufundamentals.org/webgpu/lessons/webgpu-timing.html
 import TimingHelper from './resources/js/timing-helper.js';
@@ -78,14 +81,9 @@
 
 /**
  * Given hue, saturation, and luminance values in the range of 0 to 1
- * returns an array of values from 0 to 1
+ * returns an array of 4 values from 0 to 1
  */
 const hslToRGBA = (h, s, l) => cssColorToRGBA(hsl(h, s, l));
-/**
- * Given hue, saturation, and luminance values in the range of 0 to 1
- * returns an array of values from 0 to 255
- */
-const hslToRGBA8 = (h, s, l) => cssColorToRGBA8(hsl(h, s, l));
 
 /**
  * Returns a random number between min and max.
@@ -293,28 +291,24 @@
     },
   });
 
-  const texture = device.createTexture({
-    size: [2, 2],
-    format: 'rgba8unorm',
-    usage:
-      GPUTextureUsage.TEXTURE_BINDING |
-      GPUTextureUsage.COPY_DST,
+  const textures = [
+    '😂', '👾', '👍', '👀', '🌞', '🛟',
+  ].map(s => {
+    const size = 128;
+    const ctx = new OffscreenCanvas(size, size).getContext('2d');
+    ctx.fillStyle = '#fff';
+    ctx.fillRect(0, 0, size, size);
+    ctx.font = `${size * 0.9}px sans-serif`;
+    ctx.textAlign = 'center';
+    ctx.textBaseline = 'middle';
+    ctx.fillText(s, size / 2, size / 2);
+    return createTextureFromSource(device, ctx.canvas, {mips: true});
   });
-  device.queue.writeTexture(
-      { texture },
-      new Uint8Array([
-        ...hslToRGBA8(0, 0, 1),
-        ...hslToRGBA8(0, 0, 0.5),
-        ...hslToRGBA8(0, 0, 0.75),
-        ...hslToRGBA8(0, 0, 0.25),
-      ]),
-      { bytesPerRow: 8, rowsPerImage: 2 },
-      { width: 2, height: 2 },
-  );
 
   const sampler = device.createSampler({
-    magFilter: 'nearest',
-    minFilter: 'nearest',
+    magFilter: 'linear',
+    minFilter: 'linear',
+    mipmapFilter: 'nearest',
   });
 
   const numMaterials = 20;
@@ -325,7 +319,7 @@
     materials.push({
       color,
       shininess,
-      texture,
+      texture: randomArrayElement(textures),
       sampler,
     });
   }
diff --git a/webgpu/webgpu-optimization-step4-material-uniforms.html b/webgpu/webgpu-optimization-step4-material-uniforms.html
index b7031037..4457f788 100644
--- a/webgpu/webgpu-optimization-step4-material-uniforms.html
+++ b/webgpu/webgpu-optimization-step4-material-uniforms.html
@@ -44,6 +44,9 @@
   </body>
   <script type="module">
 import GUI from '../3rdparty/muigui-0.x.module.js';
+// see https://webgpufundamentals.org/webgpu/lessons/webgpu-utils.html#webgpu-utils
+import {createTextureFromSource} from '../3rdparty/webgpu-utils-1.x.module.js';
+// see https://webgpufundamentals.org/webgpu/lessons/webgpu-matrix-math.html
 import {mat4, mat3, vec3} from '../3rdparty/wgpu-matrix.module.js';
 // see https://webgpufundamentals.org/webgpu/lessons/webgpu-timing.html
 import TimingHelper from './resources/js/timing-helper.js';
@@ -78,14 +81,9 @@
 
 /**
  * Given hue, saturation, and luminance values in the range of 0 to 1
- * returns an array of values from 0 to 1
+ * returns an array of 4 values from 0 to 1
  */
 const hslToRGBA = (h, s, l) => cssColorToRGBA(hsl(h, s, l));
-/**
- * Given hue, saturation, and luminance values in the range of 0 to 1
- * returns an array of values from 0 to 255
- */
-const hslToRGBA8 = (h, s, l) => cssColorToRGBA8(hsl(h, s, l));
 
 /**
  * Returns a random number between min and max.
@@ -298,28 +296,24 @@
     },
   });
 
-  const texture = device.createTexture({
-    size: [2, 2],
-    format: 'rgba8unorm',
-    usage:
-      GPUTextureUsage.TEXTURE_BINDING |
-      GPUTextureUsage.COPY_DST,
+  const textures = [
+    '😂', '👾', '👍', '👀', '🌞', '🛟',
+  ].map(s => {
+    const size = 128;
+    const ctx = new OffscreenCanvas(size, size).getContext('2d');
+    ctx.fillStyle = '#fff';
+    ctx.fillRect(0, 0, size, size);
+    ctx.font = `${size * 0.9}px sans-serif`;
+    ctx.textAlign = 'center';
+    ctx.textBaseline = 'middle';
+    ctx.fillText(s, size / 2, size / 2);
+    return createTextureFromSource(device, ctx.canvas, {mips: true});
   });
-  device.queue.writeTexture(
-      { texture },
-      new Uint8Array([
-        ...hslToRGBA8(0, 0, 1),
-        ...hslToRGBA8(0, 0, 0.5),
-        ...hslToRGBA8(0, 0, 0.75),
-        ...hslToRGBA8(0, 0, 0.25),
-      ]),
-      { bytesPerRow: 8, rowsPerImage: 2 },
-      { width: 2, height: 2 },
-  );
 
   const sampler = device.createSampler({
-    magFilter: 'nearest',
-    minFilter: 'nearest',
+    magFilter: 'linear',
+    minFilter: 'linear',
+    mipmapFilter: 'nearest',
   });
 
   const numMaterials = 20;
@@ -341,7 +335,7 @@
 
     materials.push({
       materialUniformBuffer,
-      texture,
+      texture: randomArrayElement(textures),
       sampler,
     });
   }
diff --git a/webgpu/webgpu-optimization-step5-double-buffer-frequently-updated-uniform-buffers-pre-submit.html b/webgpu/webgpu-optimization-step5-double-buffer-frequently-updated-uniform-buffers-pre-submit.html
index cb167cc4..93416361 100644
--- a/webgpu/webgpu-optimization-step5-double-buffer-frequently-updated-uniform-buffers-pre-submit.html
+++ b/webgpu/webgpu-optimization-step5-double-buffer-frequently-updated-uniform-buffers-pre-submit.html
@@ -44,6 +44,9 @@
   </body>
   <script type="module">
 import GUI from '../3rdparty/muigui-0.x.module.js';
+// see https://webgpufundamentals.org/webgpu/lessons/webgpu-utils.html#webgpu-utils
+import {createTextureFromSource} from '../3rdparty/webgpu-utils-1.x.module.js';
+// see https://webgpufundamentals.org/webgpu/lessons/webgpu-matrix-math.html
 import {mat4, mat3, vec3} from '../3rdparty/wgpu-matrix.module.js';
 // see https://webgpufundamentals.org/webgpu/lessons/webgpu-timing.html
 import TimingHelper from './resources/js/timing-helper.js';
@@ -78,14 +81,9 @@
 
 /**
  * Given hue, saturation, and luminance values in the range of 0 to 1
- * returns an array of values from 0 to 1
+ * returns an array of 4 values from 0 to 1
  */
 const hslToRGBA = (h, s, l) => cssColorToRGBA(hsl(h, s, l));
-/**
- * Given hue, saturation, and luminance values in the range of 0 to 1
- * returns an array of values from 0 to 255
- */
-const hslToRGBA8 = (h, s, l) => cssColorToRGBA8(hsl(h, s, l));
 
 /**
  * Returns a random number between min and max.
@@ -298,28 +296,24 @@
     },
   });
 
-  const texture = device.createTexture({
-    size: [2, 2],
-    format: 'rgba8unorm',
-    usage:
-      GPUTextureUsage.TEXTURE_BINDING |
-      GPUTextureUsage.COPY_DST,
+  const textures = [
+    '😂', '👾', '👍', '👀', '🌞', '🛟',
+  ].map(s => {
+    const size = 128;
+    const ctx = new OffscreenCanvas(size, size).getContext('2d');
+    ctx.fillStyle = '#fff';
+    ctx.fillRect(0, 0, size, size);
+    ctx.font = `${size * 0.9}px sans-serif`;
+    ctx.textAlign = 'center';
+    ctx.textBaseline = 'middle';
+    ctx.fillText(s, size / 2, size / 2);
+    return createTextureFromSource(device, ctx.canvas, {mips: true});
   });
-  device.queue.writeTexture(
-      { texture },
-      new Uint8Array([
-        ...hslToRGBA8(0, 0, 1),
-        ...hslToRGBA8(0, 0, 0.5),
-        ...hslToRGBA8(0, 0, 0.75),
-        ...hslToRGBA8(0, 0, 0.25),
-      ]),
-      { bytesPerRow: 8, rowsPerImage: 2 },
-      { width: 2, height: 2 },
-  );
 
   const sampler = device.createSampler({
-    magFilter: 'nearest',
-    minFilter: 'nearest',
+    magFilter: 'linear',
+    minFilter: 'linear',
+    mipmapFilter: 'nearest',
   });
 
   const numMaterials = 20;
@@ -341,7 +335,7 @@
 
     materials.push({
       materialUniformBuffer,
-      texture,
+      texture: randomArrayElement(textures),
       sampler,
     });
   }
@@ -412,7 +406,6 @@
     const worldValue = uniformValues.subarray(
         kWorldOffset, kWorldOffset + 16);
 
-
     const axis = vec3.normalize([rand(-1, 1), rand(-1, 1), rand(-1, 1)]);
     const radius = rand(10, 100);
     const speed = rand(0.1, 0.4);
diff --git a/webgpu/webgpu-optimization-step5-double-buffer-frequently-updated-uniform-buffers.html b/webgpu/webgpu-optimization-step5-double-buffer-frequently-updated-uniform-buffers.html
index cb167cc4..93416361 100644
--- a/webgpu/webgpu-optimization-step5-double-buffer-frequently-updated-uniform-buffers.html
+++ b/webgpu/webgpu-optimization-step5-double-buffer-frequently-updated-uniform-buffers.html
@@ -44,6 +44,9 @@
   </body>
   <script type="module">
 import GUI from '../3rdparty/muigui-0.x.module.js';
+// see https://webgpufundamentals.org/webgpu/lessons/webgpu-utils.html#webgpu-utils
+import {createTextureFromSource} from '../3rdparty/webgpu-utils-1.x.module.js';
+// see https://webgpufundamentals.org/webgpu/lessons/webgpu-matrix-math.html
 import {mat4, mat3, vec3} from '../3rdparty/wgpu-matrix.module.js';
 // see https://webgpufundamentals.org/webgpu/lessons/webgpu-timing.html
 import TimingHelper from './resources/js/timing-helper.js';
@@ -78,14 +81,9 @@
 
 /**
  * Given hue, saturation, and luminance values in the range of 0 to 1
- * returns an array of values from 0 to 1
+ * returns an array of 4 values from 0 to 1
  */
 const hslToRGBA = (h, s, l) => cssColorToRGBA(hsl(h, s, l));
-/**
- * Given hue, saturation, and luminance values in the range of 0 to 1
- * returns an array of values from 0 to 255
- */
-const hslToRGBA8 = (h, s, l) => cssColorToRGBA8(hsl(h, s, l));
 
 /**
  * Returns a random number between min and max.
@@ -298,28 +296,24 @@
     },
   });
 
-  const texture = device.createTexture({
-    size: [2, 2],
-    format: 'rgba8unorm',
-    usage:
-      GPUTextureUsage.TEXTURE_BINDING |
-      GPUTextureUsage.COPY_DST,
+  const textures = [
+    '😂', '👾', '👍', '👀', '🌞', '🛟',
+  ].map(s => {
+    const size = 128;
+    const ctx = new OffscreenCanvas(size, size).getContext('2d');
+    ctx.fillStyle = '#fff';
+    ctx.fillRect(0, 0, size, size);
+    ctx.font = `${size * 0.9}px sans-serif`;
+    ctx.textAlign = 'center';
+    ctx.textBaseline = 'middle';
+    ctx.fillText(s, size / 2, size / 2);
+    return createTextureFromSource(device, ctx.canvas, {mips: true});
   });
-  device.queue.writeTexture(
-      { texture },
-      new Uint8Array([
-        ...hslToRGBA8(0, 0, 1),
-        ...hslToRGBA8(0, 0, 0.5),
-        ...hslToRGBA8(0, 0, 0.75),
-        ...hslToRGBA8(0, 0, 0.25),
-      ]),
-      { bytesPerRow: 8, rowsPerImage: 2 },
-      { width: 2, height: 2 },
-  );
 
   const sampler = device.createSampler({
-    magFilter: 'nearest',
-    minFilter: 'nearest',
+    magFilter: 'linear',
+    minFilter: 'linear',
+    mipmapFilter: 'nearest',
   });
 
   const numMaterials = 20;
@@ -341,7 +335,7 @@
 
     materials.push({
       materialUniformBuffer,
-      texture,
+      texture: randomArrayElement(textures),
       sampler,
     });
   }
@@ -412,7 +406,6 @@
     const worldValue = uniformValues.subarray(
         kWorldOffset, kWorldOffset + 16);
 
-
     const axis = vec3.normalize([rand(-1, 1), rand(-1, 1), rand(-1, 1)]);
     const radius = rand(10, 100);
     const speed = rand(0.1, 0.4);
diff --git a/webgpu/webgpu-optimization-step5-use-buffer-offsets.html b/webgpu/webgpu-optimization-step5-use-buffer-offsets.html
index bd16b55f..18e5b0b4 100644
--- a/webgpu/webgpu-optimization-step5-use-buffer-offsets.html
+++ b/webgpu/webgpu-optimization-step5-use-buffer-offsets.html
@@ -44,6 +44,9 @@
   </body>
   <script type="module">
 import GUI from '../3rdparty/muigui-0.x.module.js';
+// see https://webgpufundamentals.org/webgpu/lessons/webgpu-utils.html#webgpu-utils
+import {createTextureFromSource} from '../3rdparty/webgpu-utils-1.x.module.js';
+// see https://webgpufundamentals.org/webgpu/lessons/webgpu-matrix-math.html
 import {mat4, mat3, vec3} from '../3rdparty/wgpu-matrix.module.js';
 // see https://webgpufundamentals.org/webgpu/lessons/webgpu-timing.html
 import TimingHelper from './resources/js/timing-helper.js';
@@ -78,14 +81,9 @@
 
 /**
  * Given hue, saturation, and luminance values in the range of 0 to 1
- * returns an array of values from 0 to 1
+ * returns an array of 4 values from 0 to 1
  */
 const hslToRGBA = (h, s, l) => cssColorToRGBA(hsl(h, s, l));
-/**
- * Given hue, saturation, and luminance values in the range of 0 to 1
- * returns an array of values from 0 to 255
- */
-const hslToRGBA8 = (h, s, l) => cssColorToRGBA8(hsl(h, s, l));
 
 /**
  * Returns a random number between min and max.
@@ -301,28 +299,24 @@
     },
   });
 
-  const texture = device.createTexture({
-    size: [2, 2],
-    format: 'rgba8unorm',
-    usage:
-      GPUTextureUsage.TEXTURE_BINDING |
-      GPUTextureUsage.COPY_DST,
+  const textures = [
+    '😂', '👾', '👍', '👀', '🌞', '🛟',
+  ].map(s => {
+    const size = 128;
+    const ctx = new OffscreenCanvas(size, size).getContext('2d');
+    ctx.fillStyle = '#fff';
+    ctx.fillRect(0, 0, size, size);
+    ctx.font = `${size * 0.9}px sans-serif`;
+    ctx.textAlign = 'center';
+    ctx.textBaseline = 'middle';
+    ctx.fillText(s, size / 2, size / 2);
+    return createTextureFromSource(device, ctx.canvas, {mips: true});
   });
-  device.queue.writeTexture(
-      { texture },
-      new Uint8Array([
-        ...hslToRGBA8(0, 0, 1),
-        ...hslToRGBA8(0, 0, 0.5),
-        ...hslToRGBA8(0, 0, 0.75),
-        ...hslToRGBA8(0, 0, 0.25),
-      ]),
-      { bytesPerRow: 8, rowsPerImage: 2 },
-      { width: 2, height: 2 },
-  );
 
   const sampler = device.createSampler({
-    magFilter: 'nearest',
-    minFilter: 'nearest',
+    magFilter: 'linear',
+    minFilter: 'linear',
+    mipmapFilter: 'nearest',
   });
 
   const numMaterials = 20;
@@ -344,7 +338,7 @@
 
     materials.push({
       materialUniformBuffer,
-      texture,
+      texture: randomArrayElement(textures),
       sampler,
     });
   }
diff --git a/webgpu/webgpu-optimization-step6-use-mapped-buffers-2-command-buffers.html b/webgpu/webgpu-optimization-step6-use-mapped-buffers-2-command-buffers.html
index 2c8809de..3a182bf9 100644
--- a/webgpu/webgpu-optimization-step6-use-mapped-buffers-2-command-buffers.html
+++ b/webgpu/webgpu-optimization-step6-use-mapped-buffers-2-command-buffers.html
@@ -44,6 +44,9 @@
   </body>
   <script type="module">
 import GUI from '../3rdparty/muigui-0.x.module.js';
+// see https://webgpufundamentals.org/webgpu/lessons/webgpu-utils.html#webgpu-utils
+import {createTextureFromSource} from '../3rdparty/webgpu-utils-1.x.module.js';
+// see https://webgpufundamentals.org/webgpu/lessons/webgpu-matrix-math.html
 import {mat4, mat3, vec3} from '../3rdparty/wgpu-matrix.module.js';
 // see https://webgpufundamentals.org/webgpu/lessons/webgpu-timing.html
 import TimingHelper from './resources/js/timing-helper.js';
@@ -78,14 +81,9 @@
 
 /**
  * Given hue, saturation, and luminance values in the range of 0 to 1
- * returns an array of values from 0 to 1
+ * returns an array of 4 values from 0 to 1
  */
 const hslToRGBA = (h, s, l) => cssColorToRGBA(hsl(h, s, l));
-/**
- * Given hue, saturation, and luminance values in the range of 0 to 1
- * returns an array of values from 0 to 255
- */
-const hslToRGBA8 = (h, s, l) => cssColorToRGBA8(hsl(h, s, l));
 
 /**
  * Returns a random number between min and max.
@@ -301,28 +299,24 @@
     },
   });
 
-  const texture = device.createTexture({
-    size: [2, 2],
-    format: 'rgba8unorm',
-    usage:
-      GPUTextureUsage.TEXTURE_BINDING |
-      GPUTextureUsage.COPY_DST,
+  const textures = [
+    '😂', '👾', '👍', '👀', '🌞', '🛟',
+  ].map(s => {
+    const size = 128;
+    const ctx = new OffscreenCanvas(size, size).getContext('2d');
+    ctx.fillStyle = '#fff';
+    ctx.fillRect(0, 0, size, size);
+    ctx.font = `${size * 0.9}px sans-serif`;
+    ctx.textAlign = 'center';
+    ctx.textBaseline = 'middle';
+    ctx.fillText(s, size / 2, size / 2);
+    return createTextureFromSource(device, ctx.canvas, {mips: true});
   });
-  device.queue.writeTexture(
-      { texture },
-      new Uint8Array([
-        ...hslToRGBA8(0, 0, 1),
-        ...hslToRGBA8(0, 0, 0.5),
-        ...hslToRGBA8(0, 0, 0.75),
-        ...hslToRGBA8(0, 0, 0.25),
-      ]),
-      { bytesPerRow: 8, rowsPerImage: 2 },
-      { width: 2, height: 2 },
-  );
 
   const sampler = device.createSampler({
-    magFilter: 'nearest',
-    minFilter: 'nearest',
+    magFilter: 'linear',
+    minFilter: 'linear',
+    mipmapFilter: 'nearest',
   });
 
   const numMaterials = 20;
@@ -344,7 +338,7 @@
 
     materials.push({
       materialUniformBuffer,
-      texture,
+      texture: randomArrayElement(textures),
       sampler,
     });
   }
diff --git a/webgpu/webgpu-optimization-step6-use-mapped-buffers-dyanmic-offsets.html b/webgpu/webgpu-optimization-step6-use-mapped-buffers-dyanmic-offsets.html
index 1d7ca9a8..c5076da0 100644
--- a/webgpu/webgpu-optimization-step6-use-mapped-buffers-dyanmic-offsets.html
+++ b/webgpu/webgpu-optimization-step6-use-mapped-buffers-dyanmic-offsets.html
@@ -44,6 +44,9 @@
   </body>
   <script type="module">
 import GUI from '../3rdparty/muigui-0.x.module.js';
+// see https://webgpufundamentals.org/webgpu/lessons/webgpu-utils.html#webgpu-utils
+import {createTextureFromSource} from '../3rdparty/webgpu-utils-1.x.module.js';
+// see https://webgpufundamentals.org/webgpu/lessons/webgpu-matrix-math.html
 import {mat4, mat3, vec3} from '../3rdparty/wgpu-matrix.module.js';
 // see https://webgpufundamentals.org/webgpu/lessons/webgpu-timing.html
 import TimingHelper from './resources/js/timing-helper.js';
@@ -78,14 +81,9 @@
 
 /**
  * Given hue, saturation, and luminance values in the range of 0 to 1
- * returns an array of values from 0 to 1
+ * returns an array of 4 values from 0 to 1
  */
 const hslToRGBA = (h, s, l) => cssColorToRGBA(hsl(h, s, l));
-/**
- * Given hue, saturation, and luminance values in the range of 0 to 1
- * returns an array of values from 0 to 255
- */
-const hslToRGBA8 = (h, s, l) => cssColorToRGBA8(hsl(h, s, l));
 
 /**
  * Returns a random number between min and max.
@@ -341,28 +339,24 @@
     },
   });
 
-  const texture = device.createTexture({
-    size: [2, 2],
-    format: 'rgba8unorm',
-    usage:
-      GPUTextureUsage.TEXTURE_BINDING |
-      GPUTextureUsage.COPY_DST,
+  const textures = [
+    '😂', '👾', '👍', '👀', '🌞', '🛟',
+  ].map(s => {
+    const size = 128;
+    const ctx = new OffscreenCanvas(size, size).getContext('2d');
+    ctx.fillStyle = '#fff';
+    ctx.fillRect(0, 0, size, size);
+    ctx.font = `${size * 0.9}px sans-serif`;
+    ctx.textAlign = 'center';
+    ctx.textBaseline = 'middle';
+    ctx.fillText(s, size / 2, size / 2);
+    return createTextureFromSource(device, ctx.canvas, {mips: true});
   });
-  device.queue.writeTexture(
-      { texture },
-      new Uint8Array([
-        ...hslToRGBA8(0, 0, 1),
-        ...hslToRGBA8(0, 0, 0.5),
-        ...hslToRGBA8(0, 0, 0.75),
-        ...hslToRGBA8(0, 0, 0.25),
-      ]),
-      { bytesPerRow: 8, rowsPerImage: 2 },
-      { width: 2, height: 2 },
-  );
 
   const sampler = device.createSampler({
-    magFilter: 'nearest',
-    minFilter: 'nearest',
+    magFilter: 'linear',
+    minFilter: 'linear',
+    mipmapFilter: 'nearest',
   });
 
   const numMaterials = 20;
@@ -384,7 +378,7 @@
 
     materials.push({
       materialUniformBuffer,
-      texture,
+      texture: randomArrayElement(textures),
       sampler,
     });
   }
diff --git a/webgpu/webgpu-optimization-step6-use-mapped-buffers-math-w-offsets.html b/webgpu/webgpu-optimization-step6-use-mapped-buffers-math-w-offsets.html
index ffe102cf..fecd4017 100644
--- a/webgpu/webgpu-optimization-step6-use-mapped-buffers-math-w-offsets.html
+++ b/webgpu/webgpu-optimization-step6-use-mapped-buffers-math-w-offsets.html
@@ -44,7 +44,8 @@
   </body>
   <script type="module">
 import GUI from '../3rdparty/muigui-0.x.module.js';
-//import {mat4, mat3, vec3} from '../3rdparty/wgpu-matrix.module.js';
+// see https://webgpufundamentals.org/webgpu/lessons/webgpu-utils.html#webgpu-utils
+import {createTextureFromSource} from '../3rdparty/webgpu-utils-1.x.module.js';
 // see https://webgpufundamentals.org/webgpu/lessons/webgpu-timing.html
 import TimingHelper from './resources/js/timing-helper.js';
 // see https://webgpufundamentals.org/webgpu/lessons/webgpu-timing.html
@@ -609,7 +610,6 @@
   },
 };
 
-
 const fpsAverage = new RollingAverage();
 const jsAverage = new RollingAverage();
 const gpuAverage = new RollingAverage();
@@ -638,14 +638,9 @@
 
 /**
  * Given hue, saturation, and luminance values in the range of 0 to 1
- * returns an array of values from 0 to 1
+ * returns an array of 4 values from 0 to 1
  */
 const hslToRGBA = (h, s, l) => cssColorToRGBA(hsl(h, s, l));
-/**
- * Given hue, saturation, and luminance values in the range of 0 to 1
- * returns an array of values from 0 to 255
- */
-const hslToRGBA8 = (h, s, l) => cssColorToRGBA8(hsl(h, s, l));
 
 /**
  * Returns a random number between min and max.
@@ -861,28 +856,24 @@
     },
   });
 
-  const texture = device.createTexture({
-    size: [2, 2],
-    format: 'rgba8unorm',
-    usage:
-      GPUTextureUsage.TEXTURE_BINDING |
-      GPUTextureUsage.COPY_DST,
+  const textures = [
+    '😂', '👾', '👍', '👀', '🌞', '🛟',
+  ].map(s => {
+    const size = 128;
+    const ctx = new OffscreenCanvas(size, size).getContext('2d');
+    ctx.fillStyle = '#fff';
+    ctx.fillRect(0, 0, size, size);
+    ctx.font = `${size * 0.9}px sans-serif`;
+    ctx.textAlign = 'center';
+    ctx.textBaseline = 'middle';
+    ctx.fillText(s, size / 2, size / 2);
+    return createTextureFromSource(device, ctx.canvas, {mips: true});
   });
-  device.queue.writeTexture(
-      { texture },
-      new Uint8Array([
-        ...hslToRGBA8(0, 0, 1),
-        ...hslToRGBA8(0, 0, 0.5),
-        ...hslToRGBA8(0, 0, 0.75),
-        ...hslToRGBA8(0, 0, 0.25),
-      ]),
-      { bytesPerRow: 8, rowsPerImage: 2 },
-      { width: 2, height: 2 },
-  );
 
   const sampler = device.createSampler({
-    magFilter: 'nearest',
-    minFilter: 'nearest',
+    magFilter: 'linear',
+    minFilter: 'linear',
+    mipmapFilter: 'nearest',
   });
 
   const numMaterials = 20;
@@ -904,7 +895,7 @@
 
     materials.push({
       materialUniformBuffer,
-      texture,
+      texture: randomArrayElement(textures),
       sampler,
     });
   }
diff --git a/webgpu/webgpu-optimization-step6-use-mapped-buffers.html b/webgpu/webgpu-optimization-step6-use-mapped-buffers.html
index a70a8d6c..63307848 100644
--- a/webgpu/webgpu-optimization-step6-use-mapped-buffers.html
+++ b/webgpu/webgpu-optimization-step6-use-mapped-buffers.html
@@ -44,6 +44,9 @@
   </body>
   <script type="module">
 import GUI from '../3rdparty/muigui-0.x.module.js';
+// see https://webgpufundamentals.org/webgpu/lessons/webgpu-utils.html#webgpu-utils
+import {createTextureFromSource} from '../3rdparty/webgpu-utils-1.x.module.js';
+// see https://webgpufundamentals.org/webgpu/lessons/webgpu-matrix-math.html
 import {mat4, mat3, vec3} from '../3rdparty/wgpu-matrix.module.js';
 // see https://webgpufundamentals.org/webgpu/lessons/webgpu-timing.html
 import TimingHelper from './resources/js/timing-helper.js';
@@ -78,14 +81,9 @@
 
 /**
  * Given hue, saturation, and luminance values in the range of 0 to 1
- * returns an array of values from 0 to 1
+ * returns an array of 4 values from 0 to 1
  */
 const hslToRGBA = (h, s, l) => cssColorToRGBA(hsl(h, s, l));
-/**
- * Given hue, saturation, and luminance values in the range of 0 to 1
- * returns an array of values from 0 to 255
- */
-const hslToRGBA8 = (h, s, l) => cssColorToRGBA8(hsl(h, s, l));
 
 /**
  * Returns a random number between min and max.
@@ -301,28 +299,24 @@
     },
   });
 
-  const texture = device.createTexture({
-    size: [2, 2],
-    format: 'rgba8unorm',
-    usage:
-      GPUTextureUsage.TEXTURE_BINDING |
-      GPUTextureUsage.COPY_DST,
+  const textures = [
+    '😂', '👾', '👍', '👀', '🌞', '🛟',
+  ].map(s => {
+    const size = 128;
+    const ctx = new OffscreenCanvas(size, size).getContext('2d');
+    ctx.fillStyle = '#fff';
+    ctx.fillRect(0, 0, size, size);
+    ctx.font = `${size * 0.9}px sans-serif`;
+    ctx.textAlign = 'center';
+    ctx.textBaseline = 'middle';
+    ctx.fillText(s, size / 2, size / 2);
+    return createTextureFromSource(device, ctx.canvas, {mips: true});
   });
-  device.queue.writeTexture(
-      { texture },
-      new Uint8Array([
-        ...hslToRGBA8(0, 0, 1),
-        ...hslToRGBA8(0, 0, 0.5),
-        ...hslToRGBA8(0, 0, 0.75),
-        ...hslToRGBA8(0, 0, 0.25),
-      ]),
-      { bytesPerRow: 8, rowsPerImage: 2 },
-      { width: 2, height: 2 },
-  );
 
   const sampler = device.createSampler({
-    magFilter: 'nearest',
-    minFilter: 'nearest',
+    magFilter: 'linear',
+    minFilter: 'linear',
+    mipmapFilter: 'nearest',
   });
 
   const numMaterials = 20;
@@ -344,7 +338,7 @@
 
     materials.push({
       materialUniformBuffer,
-      texture,
+      texture: randomArrayElement(textures),
       sampler,
     });
   }
diff --git a/webgpu/webgpu-optimization-step7-double-buffer-2-submit.html b/webgpu/webgpu-optimization-step7-double-buffer-2-submit.html
index cc32e983..beef2180 100644
--- a/webgpu/webgpu-optimization-step7-double-buffer-2-submit.html
+++ b/webgpu/webgpu-optimization-step7-double-buffer-2-submit.html
@@ -44,6 +44,9 @@
   </body>
   <script type="module">
 import GUI from '../3rdparty/muigui-0.x.module.js';
+// see https://webgpufundamentals.org/webgpu/lessons/webgpu-utils.html#webgpu-utils
+import {createTextureFromSource} from '../3rdparty/webgpu-utils-1.x.module.js';
+// see https://webgpufundamentals.org/webgpu/lessons/webgpu-matrix-math.html
 import {mat4, mat3, vec3} from '../3rdparty/wgpu-matrix.module.js';
 // see https://webgpufundamentals.org/webgpu/lessons/webgpu-timing.html
 import TimingHelper from './resources/js/timing-helper.js';
@@ -78,14 +81,9 @@
 
 /**
  * Given hue, saturation, and luminance values in the range of 0 to 1
- * returns an array of values from 0 to 1
+ * returns an array of 4 values from 0 to 1
  */
 const hslToRGBA = (h, s, l) => cssColorToRGBA(hsl(h, s, l));
-/**
- * Given hue, saturation, and luminance values in the range of 0 to 1
- * returns an array of values from 0 to 255
- */
-const hslToRGBA8 = (h, s, l) => cssColorToRGBA8(hsl(h, s, l));
 
 /**
  * Returns a random number between min and max.
@@ -301,28 +299,24 @@
     },
   });
 
-  const texture = device.createTexture({
-    size: [2, 2],
-    format: 'rgba8unorm',
-    usage:
-      GPUTextureUsage.TEXTURE_BINDING |
-      GPUTextureUsage.COPY_DST,
+  const textures = [
+    '😂', '👾', '👍', '👀', '🌞', '🛟',
+  ].map(s => {
+    const size = 128;
+    const ctx = new OffscreenCanvas(size, size).getContext('2d');
+    ctx.fillStyle = '#fff';
+    ctx.fillRect(0, 0, size, size);
+    ctx.font = `${size * 0.9}px sans-serif`;
+    ctx.textAlign = 'center';
+    ctx.textBaseline = 'middle';
+    ctx.fillText(s, size / 2, size / 2);
+    return createTextureFromSource(device, ctx.canvas, {mips: true});
   });
-  device.queue.writeTexture(
-      { texture },
-      new Uint8Array([
-        ...hslToRGBA8(0, 0, 1),
-        ...hslToRGBA8(0, 0, 0.5),
-        ...hslToRGBA8(0, 0, 0.75),
-        ...hslToRGBA8(0, 0, 0.25),
-      ]),
-      { bytesPerRow: 8, rowsPerImage: 2 },
-      { width: 2, height: 2 },
-  );
 
   const sampler = device.createSampler({
-    magFilter: 'nearest',
-    minFilter: 'nearest',
+    magFilter: 'linear',
+    minFilter: 'linear',
+    mipmapFilter: 'nearest',
   });
 
   const numMaterials = 20;
@@ -344,7 +338,7 @@
 
     materials.push({
       materialUniformBuffer,
-      texture,
+      texture: randomArrayElement(textures),
       sampler,
     });
   }
diff --git a/webgpu/webgpu-optimization-step7-double-buffer-typedarray-set.html b/webgpu/webgpu-optimization-step7-double-buffer-typedarray-set.html
index 89ce54ac..08d41df2 100644
--- a/webgpu/webgpu-optimization-step7-double-buffer-typedarray-set.html
+++ b/webgpu/webgpu-optimization-step7-double-buffer-typedarray-set.html
@@ -44,6 +44,9 @@
   </body>
   <script type="module">
 import GUI from '../3rdparty/muigui-0.x.module.js';
+// see https://webgpufundamentals.org/webgpu/lessons/webgpu-utils.html#webgpu-utils
+import {createTextureFromSource} from '../3rdparty/webgpu-utils-1.x.module.js';
+// see https://webgpufundamentals.org/webgpu/lessons/webgpu-matrix-math.html
 import {mat4, mat3, vec3} from '../3rdparty/wgpu-matrix.module.js';
 // see https://webgpufundamentals.org/webgpu/lessons/webgpu-timing.html
 import TimingHelper from './resources/js/timing-helper.js';
@@ -78,14 +81,9 @@
 
 /**
  * Given hue, saturation, and luminance values in the range of 0 to 1
- * returns an array of values from 0 to 1
+ * returns an array of 4 values from 0 to 1
  */
 const hslToRGBA = (h, s, l) => cssColorToRGBA(hsl(h, s, l));
-/**
- * Given hue, saturation, and luminance values in the range of 0 to 1
- * returns an array of values from 0 to 255
- */
-const hslToRGBA8 = (h, s, l) => cssColorToRGBA8(hsl(h, s, l));
 
 /**
  * Returns a random number between min and max.
@@ -301,28 +299,24 @@
     },
   });
 
-  const texture = device.createTexture({
-    size: [2, 2],
-    format: 'rgba8unorm',
-    usage:
-      GPUTextureUsage.TEXTURE_BINDING |
-      GPUTextureUsage.COPY_DST,
+  const textures = [
+    '😂', '👾', '👍', '👀', '🌞', '🛟',
+  ].map(s => {
+    const size = 128;
+    const ctx = new OffscreenCanvas(size, size).getContext('2d');
+    ctx.fillStyle = '#fff';
+    ctx.fillRect(0, 0, size, size);
+    ctx.font = `${size * 0.9}px sans-serif`;
+    ctx.textAlign = 'center';
+    ctx.textBaseline = 'middle';
+    ctx.fillText(s, size / 2, size / 2);
+    return createTextureFromSource(device, ctx.canvas, {mips: true});
   });
-  device.queue.writeTexture(
-      { texture },
-      new Uint8Array([
-        ...hslToRGBA8(0, 0, 1),
-        ...hslToRGBA8(0, 0, 0.5),
-        ...hslToRGBA8(0, 0, 0.75),
-        ...hslToRGBA8(0, 0, 0.25),
-      ]),
-      { bytesPerRow: 8, rowsPerImage: 2 },
-      { width: 2, height: 2 },
-  );
 
   const sampler = device.createSampler({
-    magFilter: 'nearest',
-    minFilter: 'nearest',
+    magFilter: 'linear',
+    minFilter: 'linear',
+    mipmapFilter: 'nearest',
   });
 
   const numMaterials = 20;
@@ -344,7 +338,7 @@
 
     materials.push({
       materialUniformBuffer,
-      texture,
+      texture: randomArrayElement(textures),
       sampler,
     });
   }
diff --git a/webgpu/webgpu-optimization-step7-double-buffer.html b/webgpu/webgpu-optimization-step7-double-buffer.html
index 45b3d7a1..867e3d47 100644
--- a/webgpu/webgpu-optimization-step7-double-buffer.html
+++ b/webgpu/webgpu-optimization-step7-double-buffer.html
@@ -44,6 +44,9 @@
   </body>
   <script type="module">
 import GUI from '../3rdparty/muigui-0.x.module.js';
+// see https://webgpufundamentals.org/webgpu/lessons/webgpu-utils.html#webgpu-utils
+import {createTextureFromSource} from '../3rdparty/webgpu-utils-1.x.module.js';
+// see https://webgpufundamentals.org/webgpu/lessons/webgpu-matrix-math.html
 import {mat4, mat3, vec3} from '../3rdparty/wgpu-matrix.module.js';
 // see https://webgpufundamentals.org/webgpu/lessons/webgpu-timing.html
 import TimingHelper from './resources/js/timing-helper.js';
@@ -78,14 +81,9 @@
 
 /**
  * Given hue, saturation, and luminance values in the range of 0 to 1
- * returns an array of values from 0 to 1
+ * returns an array of 4 values from 0 to 1
  */
 const hslToRGBA = (h, s, l) => cssColorToRGBA(hsl(h, s, l));
-/**
- * Given hue, saturation, and luminance values in the range of 0 to 1
- * returns an array of values from 0 to 255
- */
-const hslToRGBA8 = (h, s, l) => cssColorToRGBA8(hsl(h, s, l));
 
 /**
  * Returns a random number between min and max.
@@ -301,28 +299,24 @@
     },
   });
 
-  const texture = device.createTexture({
-    size: [2, 2],
-    format: 'rgba8unorm',
-    usage:
-      GPUTextureUsage.TEXTURE_BINDING |
-      GPUTextureUsage.COPY_DST,
+  const textures = [
+    '😂', '👾', '👍', '👀', '🌞', '🛟',
+  ].map(s => {
+    const size = 128;
+    const ctx = new OffscreenCanvas(size, size).getContext('2d');
+    ctx.fillStyle = '#fff';
+    ctx.fillRect(0, 0, size, size);
+    ctx.font = `${size * 0.9}px sans-serif`;
+    ctx.textAlign = 'center';
+    ctx.textBaseline = 'middle';
+    ctx.fillText(s, size / 2, size / 2);
+    return createTextureFromSource(device, ctx.canvas, {mips: true});
   });
-  device.queue.writeTexture(
-      { texture },
-      new Uint8Array([
-        ...hslToRGBA8(0, 0, 1),
-        ...hslToRGBA8(0, 0, 0.5),
-        ...hslToRGBA8(0, 0, 0.75),
-        ...hslToRGBA8(0, 0, 0.25),
-      ]),
-      { bytesPerRow: 8, rowsPerImage: 2 },
-      { width: 2, height: 2 },
-  );
 
   const sampler = device.createSampler({
-    magFilter: 'nearest',
-    minFilter: 'nearest',
+    magFilter: 'linear',
+    minFilter: 'linear',
+    mipmapFilter: 'nearest',
   });
 
   const numMaterials = 20;
@@ -344,7 +338,7 @@
 
     materials.push({
       materialUniformBuffer,
-      texture,
+      texture: randomArrayElement(textures),
       sampler,
     });
   }