diff --git a/src/core/command-recorder.ts b/src/core/command-recorder.ts
index d2cecd4..29e927a 100644
--- a/src/core/command-recorder.ts
+++ b/src/core/command-recorder.ts
@@ -2,7 +2,7 @@ import { LoadOp, StoreOp } from '../enum.js'
 import { CommandRecorderError } from '../utils/errors.js'
 import { SwapChain } from './swap-chain.js'
 
-export class CommandRecorder {
+export class CommandEncoder implements GPUCommandEncoder {
   static _defaultClearValue = { r: 0, g: 0, b: 0, a: 1 }
 
   _device: GPUDevice
@@ -29,24 +29,24 @@ export class CommandRecorder {
 
     return [{
       view,
-      clearValue: CommandRecorder._defaultClearValue,
+      clearValue: CommandEncoder._defaultClearValue,
       loadOp: LoadOp.Clear,
       storeOp: StoreOp.Store
     }]
   }
 
-  beginRenderPass(colorAttachments?: GPURenderPassColorAttachment[], depthStencilAttachment?: GPURenderPassDepthStencilAttachment): GPURenderPassEncoder {
+  beginRenderPass(descriptor: GPURenderPassDescriptor): GPURenderPassEncoder {
     if (this._passEncoder) {
       throw CommandRecorderError.activeRenderPass()
     }
 
     const attachments = colorAttachments || this._defaultColorAttachment()
 
-    const descriptor = {
-      label: this.label || 'RenderPass',
-      colorAttachments: attachments,
-      depthStencilAttachment
-    }
+    //const descriptor = {
+    //  label: this.label || 'RenderPass',
+    //  colorAttachments: attachments,
+    //  depthStencilAttachment
+    //}
 
     this._passEncoder = this._encoder.beginRenderPass(descriptor)
 
diff --git a/src/core/graphics-device.ts b/src/core/graphics-device.ts
index 0590701..32d460d 100644
--- a/src/core/graphics-device.ts
+++ b/src/core/graphics-device.ts
@@ -1,11 +1,10 @@
 import { SwapChain } from './swap-chain.js'
 import { Buffer, UniformBuffer } from '../resources/buffer.js'
 import { GraphicsDeviceError, WebGPUError, BufferError, WebGPUObjectError } from '../utils/errors.js'
-import { GraphicsDeviceInitialized, GraphicsDeviceLost } from '../utils/events.js'
-import { EventEmitter } from '../utils/index.js'
+import { EventEmitter, GraphicsDeviceInitialized, GraphicsDeviceLost } from '../utils/events.js'
 import { ShaderModule, ShaderPairDescriptor } from '../resources/shader-module.js'
 import { RenderPipeline } from '../rendering/render-pipeline.js'
-import { CommandRecorder } from './command-recorder.js'
+import { CommandEncoder } from './command-recorder.js'
 import { BindGroupLayout } from '../resources/bind-group-layout.js'
 import { BindGroup } from '../resources/bind-group.js'
 import { Texture } from '../resources/texture.js'
@@ -125,7 +124,9 @@ class DeviceHandler {
   }
 }
 
-export class GraphicsDevice extends EventEmitter {
+export class GraphicsDevice extends EventEmitter implements GPUDevice {
+  __brand: 'GPUDevice'
+
   _canvas: HTMLCanvasElement
   _deviceHandler: DeviceHandler
   _swapChain: SwapChain
@@ -153,6 +154,34 @@ export class GraphicsDevice extends EventEmitter {
     return this._swapChain
   }
 
+  get features() {
+    return this.device.features
+  }
+
+  get limits() {
+    return this.device.limits
+  }
+
+  get adapterInfo() {
+    return this.device.adapterInfo
+  }
+
+  get lost() {
+    return this.device.lost
+  }
+
+  get onuncapturederror() {
+    return this.device.onuncapturederror
+  }
+
+  set onuncapturederror(value) {
+    this.device.onuncapturederror = value
+  }
+
+  get label() {
+    return this.device.label
+  }
+
   constructor(canvas: HTMLCanvasElement, deviceHandler: DeviceHandler) {
     super()
 
@@ -160,6 +189,34 @@ export class GraphicsDevice extends EventEmitter {
     this._deviceHandler = deviceHandler
   }
 
+  importExternalTexture(descriptor: GPUExternalTextureDescriptor): GPUExternalTexture {
+    throw new Error('Method not implemented.')
+  }
+  createComputePipeline(descriptor: GPUComputePipelineDescriptor): GPUComputePipeline {
+    throw new Error('Method not implemented.')
+  }
+  createComputePipelineAsync(descriptor: GPUComputePipelineDescriptor): Promise<GPUComputePipeline> {
+    throw new Error('Method not implemented.')
+  }
+  createRenderPipelineAsync(descriptor: GPURenderPipelineDescriptor): Promise<GPURenderPipeline> {
+    throw new Error('Method not implemented.')
+  }
+  createCommandEncoder(descriptor?: GPUCommandEncoderDescriptor): GPUCommandEncoder {
+    throw new Error('Method not implemented.')
+  }
+  createRenderBundleEncoder(descriptor: GPURenderBundleEncoderDescriptor): GPURenderBundleEncoder {
+    throw new Error('Method not implemented.')
+  }
+  createQuerySet(descriptor: GPUQuerySetDescriptor): GPUQuerySet {
+    throw new Error('Method not implemented.')
+  }
+  pushErrorScope(filter: GPUErrorFilter): undefined {
+    throw new Error('Method not implemented.')
+  }
+  popErrorScope(): Promise<GPUError | null> {
+    throw new Error('Method not implemented.')
+  }
+
   static build(canvas?: HTMLCanvasElement) {
     return new GraphicsDeviceBuilder(canvas)
   }
@@ -226,11 +283,11 @@ export class GraphicsDevice extends EventEmitter {
     return buffer
   }
 
-  createShaderModule(code: string, label: string): ShaderModule {
+  createShaderModule(descriptor: GPUShaderModuleDescriptor): ShaderModule {
     if (!this._isInitialized) { throw GraphicsDeviceError.uninitialized() }
 
     try {
-      return ShaderModule.create(this.device, { code, label })
+      return ShaderModule.create(this.device, descriptor)
     } catch (err) {
       throw WebGPUObjectError.from(err, ShaderModule)
     }
@@ -257,19 +314,16 @@ export class GraphicsDevice extends EventEmitter {
     }
   }
 
-  createCommandRecorder(label?: string): CommandRecorder {
+  createCommandRecorder(label?: string): CommandEncoder {
     if (!this._isInitialized) { throw GraphicsDeviceError.uninitialized() }
 
-    return new CommandRecorder(this.device, this._swapChain, label)
+    return new CommandEncoder(this.device, this._swapChain, label)
   }
 
-  createBindGroupLayout(entries: GPUBindGroupLayoutEntry[], label: string) {
+  createBindGroupLayout(descriptor: GPUBindGroupLayoutDescriptor) {
     if (!this._isInitialized) { throw GraphicsDeviceError.uninitialized() }
 
-    return BindGroupLayout.create(this.device, {
-      label,
-      entries
-    })
+    return BindGroupLayout.create(this.device, descriptor)
   }
 
   _getBindingResource(binding: BindGroupEntry): GPUBindingResource {
@@ -303,31 +357,24 @@ export class GraphicsDevice extends EventEmitter {
     }
   }
 
-  createBindGroup(layout: BindGroupLayout, bindings: BindGroupEntry[], label?: string) {
+  createBindGroup(descriptor: GPUBindGroupDescriptor) {
     if (!this._isInitialized) { throw GraphicsDeviceError.uninitialized() }
 
 
-    const entries = bindings.map(def => ({
-      binding: def.binding,
-      resource: this._getBindingResource(def)
-    }))
+    //const entries = bindings.map(def => ({
+    //  binding: def.binding,
+    //  resource: this._getBindingResource(def)
+    //}))
 
-    return BindGroup.create(this.device, {
-      layout: layout.handle,
-      entries,
-      label
-    })
+    return BindGroup.create(this.device, descriptor)
   }
 
-  createPipelineLayout(layouts: Array<BindGroupLayout>, label?: string) {
+  createPipelineLayout(descriptor: GPUPipelineLayoutDescriptor) {
     if (!this._isInitialized) { throw GraphicsDeviceError.uninitialized() }
 
-    const bindGroupLayouts = layouts.map(layout => layout.handle)
+    //const bindGroupLayouts = layouts.map(layout => layout.handle)
 
-    return this.device.createPipelineLayout({
-      label,
-      bindGroupLayouts
-    })
+    return this.device.createPipelineLayout(descriptor)
   }
 
   createSampler(descriptor?: GPUSamplerDescriptor) {
@@ -389,10 +436,7 @@ export class GraphicsDevice extends EventEmitter {
     this.queue.submit(commandBuffers)
   }
 
-  /**
-   * Cleans up GPU resources. Call when the application exits.
-   */
-  destroy() {
+  destroy(): undefined {
     if (this.device) {
       this.device.destroy()
     }
diff --git a/src/rendering/render-pipeline.ts b/src/rendering/render-pipeline.ts
index 93cb3f7..3166985 100644
--- a/src/rendering/render-pipeline.ts
+++ b/src/rendering/render-pipeline.ts
@@ -1,4 +1,6 @@
-export class RenderPipeline {
+export class RenderPipeline implements GPURenderPipeline {
+  __brand: 'GPURenderPipeline'
+
   _handle: GPURenderPipeline
   _label: string
 
@@ -14,5 +16,9 @@ export class RenderPipeline {
     this._handle = pipeline
     this._label = label
   }
+
+  getBindGroupLayout(index: number): GPUBindGroupLayout {
+    return this.getBindGroupLayout(index)
+  }
 }
 
diff --git a/src/resources/bind-group-layout.ts b/src/resources/bind-group-layout.ts
index 3fc44e7..13d1a6e 100644
--- a/src/resources/bind-group-layout.ts
+++ b/src/resources/bind-group-layout.ts
@@ -1,6 +1,8 @@
 import { WebGPUObjectError } from '../utils/errors.js'
 
-export class BindGroupLayout {
+export class BindGroupLayout implements GPUBindGroupLayout {
+  __brand: 'GPUBindGroupLayout'
+
   _device: GPUDevice
   _handle: GPUBindGroupLayout
 
diff --git a/src/resources/bind-group.ts b/src/resources/bind-group.ts
index 260918e..a2400b5 100644
--- a/src/resources/bind-group.ts
+++ b/src/resources/bind-group.ts
@@ -1,6 +1,8 @@
 import { WebGPUObjectError } from '../utils/errors.js'
 
-export class BindGroup {
+export class BindGroup implements GPUBindGroup {
+  __brand: 'GPUBindGroup'
+
   _device: GPUDevice
   _handle: GPUBindGroup
 
@@ -8,6 +10,10 @@ export class BindGroup {
     return this._handle
   }
 
+  get label() {
+    return this._handle.label
+  }
+
   /**
    * @param {GPUDevice} device
    * @param {GPUBindGroup} bindGroup
diff --git a/src/resources/buffer.ts b/src/resources/buffer.ts
index 8e5951d..44b48c3 100644
--- a/src/resources/buffer.ts
+++ b/src/resources/buffer.ts
@@ -5,7 +5,9 @@ import { ResourceType } from '../utils/internal-enums.js'
 type SmallTypedArray = Exclude<TypedArray, BigInt64Array | BigUint64Array>
 type SmallTypedArrayConstructor = Exclude<TypedArrayConstructor, BigInt64ArrayConstructor | BigUint64ArrayConstructor>
 
-export class Buffer {
+export class Buffer implements GPUBuffer {
+  __brand: 'GPUBuffer'
+
   _device: GPUDevice
   _handle: GPUBuffer
 
@@ -25,6 +27,14 @@ export class Buffer {
     return this._handle.usage
   }
 
+  get mapState() {
+    return this._handle.mapState
+  }
+
+  get label() {
+    return this._handle.label
+  }
+
   get resourceType() {
     return ResourceType.Buffer
   }
@@ -33,7 +43,6 @@ export class Buffer {
     this._device = device
     this._handle = texture
   }
-
   static create(device: GPUDevice, descriptor: GPUBufferDescriptor) {
     try {
       return new Buffer(
@@ -153,7 +162,20 @@ export class Buffer {
     }
   }
 
-  destroy() {
+  mapAsync(mode: GPUMapModeFlags, offset?: GPUSize64, size?: GPUSize64): Promise<undefined> {
+    return this._handle.mapAsync(mode, offset, size)
+  }
+
+  getMappedRange(offset?: GPUSize64, size?: GPUSize64): ArrayBuffer {
+    return this._handle.getMappedRange(offset, size)
+  }
+
+  unmap(): undefined {
+    this._handle.unmap()
+  }
+
+
+  destroy(): undefined {
     this._handle?.destroy()
     this._handle = null
   }
diff --git a/src/resources/sampler.ts b/src/resources/sampler.ts
index 0a755b3..c9ce882 100644
--- a/src/resources/sampler.ts
+++ b/src/resources/sampler.ts
@@ -1,9 +1,9 @@
 import { WebGPUObjectError } from '../utils/errors.js'
 import { ResourceType } from '../utils/internal-enums.js'
 
-/** @import { BindGroupEntry } from '../core/graphics-device.js' */
+export class Sampler implements GPUSampler {
+  __brand: 'GPUSampler'
 
-export class Sampler {
   _device: GPUDevice
   _handle: GPUSampler
 
diff --git a/src/resources/shader-module.ts b/src/resources/shader-module.ts
index 0bdc91f..27eba70 100644
--- a/src/resources/shader-module.ts
+++ b/src/resources/shader-module.ts
@@ -13,9 +13,8 @@ import {
 } from '../utils/wgsl-to-wgpu.js'
 import { BufferBindingType } from '../enum.js'
 
-/** @import { WGSLAccess, WGSLSamplerType } from '../utils/wgsl-to-wgpu.js' */
-
-export class ShaderModule {
+export class ShaderModule implements GPUShaderModule {
+  __brand: 'GPUShaderModule'
   _handle: GPUShaderModule
   _code: string
 
@@ -44,14 +43,17 @@ export class ShaderModule {
   }
 
   reflect() {
-    if (this._reflection == null) {
+    if (!this._reflection) {
       this._reflection = new WgslReflect(this._code)
-      // no longer needed allow the GC to collect it
       this._code = undefined
     }
 
     return this._reflection
   }
+
+  getCompilationInfo(): Promise<GPUCompilationInfo> {
+    return this._handle.getCompilationInfo()
+  }
 }
 
 export interface FragmentStateDescriptor {
@@ -83,7 +85,7 @@ export class ReflectedShader {
   }
 
 
-  constructor(shader: ShaderModule) {
+  constructor(shader: ShaderModule, reflection: WgslReflect) {
     this._module = shader
   }
 
diff --git a/src/resources/texture.ts b/src/resources/texture.ts
index 5f6fa9e..fd7205b 100644
--- a/src/resources/texture.ts
+++ b/src/resources/texture.ts
@@ -3,18 +3,19 @@ import { WebGPUObjectError } from '../utils/errors.js'
 import { ResourceType } from '../utils/internal-enums.js'
 import { textureToImageDimension } from '../utils/wgsl-to-wgpu.js'
 
-/** @import { BindGroupEntry } from '../core/graphics-device.js' */
 interface UploadTextureInfo {
   destination: GPUTexelCopyTextureInfo
   dataLayout: GPUTexelCopyBufferLayout
   size: GPUExtent3DStrict
 }
 
-export class Texture {
+export class Texture implements GPUTexture {
   static _defaultUsage = GPUTextureUsage.TEXTURE_BINDING
     | GPUTextureUsage.COPY_DST
     | GPUTextureUsage.RENDER_ATTACHMENT
 
+  __brand: 'GPUTexture'
+
   _device: GPUDevice
   _handle: GPUTexture
 
@@ -48,6 +49,10 @@ export class Texture {
     return this._handle.dimension
   }
 
+  get sampleCount() {
+    return this._handle.sampleCount
+  }
+
   get mipLevelCount() {
     return this._handle.mipLevelCount
   }
@@ -81,7 +86,6 @@ export class Texture {
     return 1 + Math.log2(max) | 0
   }
 
-
   static async fromUrl(device: GPUDevice, url: string | URL, descriptor: GPUTextureDescriptor) {
     try {
       const response = await fetch(url)
@@ -127,7 +131,6 @@ export class Texture {
     })
   }
 
-
   upload(source: GPUAllowSharedBufferSource, options?: UploadTextureInfo) {
     const mipLevel = options.destination.mipLevel || 0
     const size = options.size || [
@@ -148,8 +151,8 @@ export class Texture {
     }
   }
 
-  generateMipmaps(_commandEncoder: GPUCommandEncoder) {
-    // TODO: use MipGenerator
+  createView(descriptor?: GPUTextureViewDescriptor) {
+    return this._handle.createView(descriptor)
   }
 
   createDefaultView(descriptor?: GPUTextureViewDescriptor) {
@@ -178,7 +181,7 @@ export class Texture {
     return this.getView()
   }
 
-  destroy() {
+  destroy(): undefined {
     this._handle?.destroy()
     this._handle = undefined
     this._defaultView = undefined
diff --git a/src/utils/events.ts b/src/utils/events.ts
index dc9596f..3f0b2a1 100644
--- a/src/utils/events.ts
+++ b/src/utils/events.ts
@@ -1,5 +1,54 @@
 import { GraphicsDevice } from '../core/graphics-device.js'
 
+interface Listener {
+  (...args: any): void
+}
+
+export class EventEmitter {
+  _listeners = {}
+
+  addEventListener(type: PropertyKey, listener: Listener, options?: object): void {
+    this.on(type, listener, options)
+  }
+
+  removeEventListener(type: PropertyKey, listener: Listener, options?: object): void {
+    this.off(type, listener, options)
+  }
+
+  dispatchEvent(event: Event): boolean {
+    const details = 'detail' in event ? event.detail : undefined
+    return this.emit(event.type, ...Object.values(details))
+  }
+
+  on(event: PropertyKey, callback: Listener, _options?: object) {
+    this._listeners[event] = this._listeners[event] || []
+    this._listeners[event].push(callback)
+  }
+
+  emit(event: PropertyKey, ...args: any[]) {
+    const listeners = this._listeners[event]
+
+    if (listeners) {
+      listeners.forEach(
+        (cb: Listener) => cb(...args)
+      )
+    }
+
+    return true
+  }
+
+  off(event: PropertyKey, callback: Listener, _options?: object) {
+    const listeners = this._listeners[event]
+
+    if (listeners) {
+      this._listeners[event] = listeners.filter(
+        (cb: Listener) => cb !== callback
+      )
+    }
+  }
+}
+
+
 export class GraphicsDeviceInitialized {
   static EventName = 'graphics-device:initialized'
   graphicsDevice: GraphicsDevice
diff --git a/src/utils/index.ts b/src/utils/index.ts
index 98d9d29..03effbf 100644
--- a/src/utils/index.ts
+++ b/src/utils/index.ts
@@ -88,38 +88,6 @@ export const FlagEnum = <const T extends string, const A extends T[]>(...values:
 ) as FlagEnum<T, A>
 
 
-interface Listener {
-  (...args: any): void
-}
-export class EventEmitter {
-  _listeners = {}
-
-  on(event: PropertyKey, callback: Listener) {
-    this._listeners[event] = this._listeners[event] || []
-    this._listeners[event].push(callback)
-  }
-
-  emit(event: PropertyKey, ...args: any[]) {
-    const listeners = this._listeners[event]
-
-    if (listeners) {
-      listeners.forEach(
-        (cb: Listener) => cb(...args)
-      )
-    }
-  }
-
-  off(event: PropertyKey, callback: Listener) {
-    const listeners = this._listeners[event]
-
-    if (listeners) {
-      this._listeners[event] = listeners.filter(
-        (cb: Listener) => cb !== callback
-      )
-    }
-  }
-}
-
 export const pick = <T extends object, K extends keyof T>(obj: T, ...keys: K[]): Pick<T, K> => (Object.fromEntries(
   keys
     .filter(key => key in obj)
diff --git a/src/utils/mip-generator.ts b/src/utils/mip-generator.ts
index ef55ae5..8a7e730 100644
--- a/src/utils/mip-generator.ts
+++ b/src/utils/mip-generator.ts
@@ -1,3 +1,6 @@
+// taken from PixiJS
+// https://pixijs.download/v8.0.0-rc.2/docs/rendering_renderers_gpu_texture_utils_GpuMipmapGenerator.ts.html
+
 import code from './mip-shader.wgsl'
 
 const mip = (n: number) => Math.max(1, n >>> 1)
@@ -81,33 +84,37 @@ export class MipGenerator {
     return pipeline
   }
 
-  generateMipmap(texture: GPUTexture, descriptor: GPUTextureDescriptor) {
-    const pipeline = this.getPipeline(descriptor.format)
+  generateMipmap(texture: GPUTexture, commandEncoder?: GPUCommandEncoder): GPUTexture {
+    const pipeline = this.getPipeline(texture.format)
 
-    if (descriptor.dimension !== '2d') {
+    const { dimension, format, mipLevelCount, width, height, depthOrArrayLayers } = texture
+
+    const encoder = commandEncoder || this._device.createCommandEncoder()
+
+    if (texture.dimension !== '2d') {
       throw new Error('Generating mipmaps for anything except 2d is unsupported.')
     }
 
-    let mipTexture = texture
-    const { width, height, depthOrArrayLayers } = descriptor.size as GPUExtent3DDict
+    let tempTexture = texture
 
-    const renderToSource = descriptor.usage & GPUTextureUsage.RENDER_ATTACHMENT
+
+    const renderToSource = texture.usage & GPUTextureUsage.RENDER_ATTACHMENT
 
     if (!renderToSource) {
-      mipTexture = this._device.createTexture({
+      tempTexture = this._device.createTexture({
         size: {
           width: mip(width),
           height: mip(height),
           depthOrArrayLayers
         },
-        format: descriptor.format,
+        format,
         usage: GPUTextureUsage.TEXTURE_BINDING | GPUTextureUsage.COPY_SRC | GPUTextureUsage.RENDER_ATTACHMENT,
-        mipLevelCount: descriptor.mipLevelCount - 1
+        mipLevelCount: mipLevelCount - 1,
+        dimension,
+        sampleCount: 1
       })
     }
 
-    const encoder = this._device.createCommandEncoder({})
-
     for (let layer = 0; layer < depthOrArrayLayers; ++layer) {
       let srcView = texture.createView({
         baseMipLevel: 0,
@@ -117,10 +124,9 @@ export class MipGenerator {
         arrayLayerCount: 1
       })
 
-      let dstMipLevel = renderToSource ? 1 : 0
-      for (let i = 1; i < descriptor.mipLevelCount; ++i) {
-        const dstView = mipTexture.createView({
-          baseMipLevel: dstMipLevel++,
+      for (let i = 1; i < mipLevelCount; ++i) {
+        const dstView = tempTexture.createView({
+          baseMipLevel: i - (renderToSource ? 0 : 1),
           mipLevelCount: 1,
           dimension: '2d',
           baseArrayLayer: layer,
@@ -156,33 +162,42 @@ export class MipGenerator {
     }
 
     if (!renderToSource) {
-      const mipLevelSize = {
+      const mipSize = {
         width: mip(width),
         height: mip(height),
         depthOrArrayLayers
       }
 
-      for (let i = 1; i < descriptor.mipLevelCount; ++i) {
+      for (let i = 1; i < texture.mipLevelCount; ++i) {
         encoder.copyTextureToTexture({
-          texture: mipTexture,
+          texture: tempTexture,
           mipLevel: i - 1
         }, {
           texture,
           mipLevel: i,
-        }, mipLevelSize)
+        }, mipSize)
 
-        mipLevelSize.width = mip(mipLevelSize.width)
-        mipLevelSize.height = mip(mipLevelSize.height)
+        mipSize.width = mip(mipSize.width)
+        mipSize.height = mip(mipSize.height)
       }
     }
 
     this._device.queue.submit([encoder.finish()])
 
     if (!renderToSource) {
-      mipTexture.destroy()
+      tempTexture.destroy()
     }
 
     return texture
   }
+
+  destroy() {
+    this._device = undefined
+    this._sampler = undefined
+    this._shader = undefined
+    this._pipelines = undefined
+    this._bindGroupLayout = undefined
+    this._pipelineLayout = undefined
+  }
 }
 
diff --git a/src/utils/mip-shader.wgsl b/src/utils/mip-shader.wgsl
index 8daaff7..5070141 100644
--- a/src/utils/mip-shader.wgsl
+++ b/src/utils/mip-shader.wgsl
@@ -7,7 +7,7 @@ struct VertexOutput {
 };
 
 @vertex
-fn vertexMain(@builtin(vertex_index) vertexIndex : u32) -> VertexOutput {
+fn vs_main(@builtin(vertex_index) vertexIndex : u32) -> VertexOutput {
   var output : VertexOutput;
   output.texCoord = pos[vertexIndex] * vec2<f32>(0.5, -0.5) + vec2<f32>(0.5);
   output.position = vec4<f32>(pos[vertexIndex], 0.0, 1.0);
@@ -18,6 +18,6 @@ fn vertexMain(@builtin(vertex_index) vertexIndex : u32) -> VertexOutput {
 @group(0) @binding(1) var img : texture_2d<f32>;
 
 @fragment
-fn fragmentMain(@location(0) texCoord : vec2<f32>) -> @location(0) vec4<f32> {
+fn fs_main(@location(0) texCoord : vec2<f32>) -> @location(0) vec4<f32> {
   return textureSample(img, imgSampler, texCoord);
 }