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WebGPUTextures: Add support for mipmap computation.
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| // Copyright 2020 Brandon Jones | ||
| // | ||
| // Permission is hereby granted, free of charge, to any person obtaining a copy | ||
| // of this software and associated documentation files (the "Software"), to deal | ||
| // in the Software without restriction, including without limitation the rights | ||
| // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
| // copies of the Software, and to permit persons to whom the Software is | ||
| // furnished to do so, subject to the following conditions: | ||
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| // The above copyright notice and this permission notice shall be included in | ||
| // all copies or substantial portions of the Software. | ||
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| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
| // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
| // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
| // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | ||
| // SOFTWARE. | ||
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| import { GPUIndexFormat, GPUFilterMode, GPUPrimitiveTopology } from './constants.js'; | ||
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| // ported from https://github.com/toji/web-texture-tool/blob/master/src/webgpu-mipmap-generator.js | ||
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| class WebGPUTextureUtils { | ||
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| constructor( device, glslang ) { | ||
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| this.device = device; | ||
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| const mipmapVertexSource = `#version 450 | ||
| const vec2 pos[4] = vec2[4](vec2(-1.0f, 1.0f), vec2(1.0f, 1.0f), vec2(-1.0f, -1.0f), vec2(1.0f, -1.0f)); | ||
| const vec2 tex[4] = vec2[4](vec2(0.0f, 0.0f), vec2(1.0f, 0.0f), vec2(0.0f, 1.0f), vec2(1.0f, 1.0f)); | ||
| layout(location = 0) out vec2 vTex; | ||
| void main() { | ||
| vTex = tex[gl_VertexIndex]; | ||
| gl_Position = vec4(pos[gl_VertexIndex], 0.0, 1.0); | ||
| } | ||
| `; | ||
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| const mipmapFragmentSource = `#version 450 | ||
| layout(set = 0, binding = 0) uniform sampler imgSampler; | ||
| layout(set = 0, binding = 1) uniform texture2D img; | ||
| layout(location = 0) in vec2 vTex; | ||
| layout(location = 0) out vec4 outColor; | ||
| void main() { | ||
| outColor = texture(sampler2D(img, imgSampler), vTex); | ||
| }`; | ||
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| this.sampler = device.createSampler( { minFilter: GPUFilterMode.Linear } ); | ||
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| // We'll need a new pipeline for every texture format used. | ||
| this.pipelines = {}; | ||
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| this.mipmapVertexShaderModule = device.createShaderModule( { | ||
| code: glslang.compileGLSL( mipmapVertexSource, 'vertex' ), | ||
| } ); | ||
| this.mipmapFragmentShaderModule = device.createShaderModule( { | ||
| code: glslang.compileGLSL( mipmapFragmentSource, 'fragment' ), | ||
| } ); | ||
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| } | ||
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| getMipmapPipeline( format ) { | ||
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| let pipeline = this.pipelines[ format ]; | ||
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| if ( pipeline === undefined ) { | ||
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| pipeline = this.device.createRenderPipeline( { | ||
| vertexStage: { | ||
| module: this.mipmapVertexShaderModule, | ||
| entryPoint: 'main', | ||
| }, | ||
| fragmentStage: { | ||
| module: this.mipmapFragmentShaderModule, | ||
| entryPoint: 'main', | ||
| }, | ||
| primitiveTopology: GPUPrimitiveTopology.TriangleStrip, | ||
| vertexState: { | ||
| indexFormat: GPUIndexFormat.Uint32 | ||
| }, | ||
| colorStates: [ { format } ], | ||
| } ); | ||
| this.pipelines[ format ] = pipeline; | ||
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| } | ||
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| return pipeline; | ||
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| } | ||
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| generateMipmappedTexture( imageBitmap, textureGPU, textureGPUDescriptor ) { | ||
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| // mipmaps have to computed manually right now, see https://github.com/gpuweb/gpuweb/issues/386 | ||
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| const pipeline = this.getMipmapPipeline( textureGPUDescriptor.format ); | ||
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| const commandEncoder = this.device.createCommandEncoder( {} ); | ||
| // @TODO: Consider making this static. | ||
| const bindGroupLayout = pipeline.getBindGroupLayout( 0 ); | ||
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| let srcView = textureGPU.createView( { | ||
| baseMipLevel: 0, | ||
| mipLevelCount: 1, | ||
| } ); | ||
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| for ( let i = 1; i < textureGPUDescriptor.mipLevelCount; i ++ ) { | ||
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| const dstView = textureGPU.createView( { | ||
| baseMipLevel: i, | ||
| mipLevelCount: 1, | ||
| } ); | ||
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| const passEncoder = commandEncoder.beginRenderPass( { | ||
| colorAttachments: [ { | ||
| attachment: dstView, | ||
| loadValue: [ 0, 0, 0, 0 ], | ||
| } ], | ||
| } ); | ||
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| const bindGroup = this.device.createBindGroup( { | ||
| layout: bindGroupLayout, | ||
| entries: [ { | ||
| binding: 0, | ||
| resource: this.sampler, | ||
| }, { | ||
| binding: 1, | ||
| resource: srcView, | ||
| } ], | ||
| } ); | ||
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| passEncoder.setPipeline( pipeline ); | ||
| passEncoder.setBindGroup( 0, bindGroup ); | ||
| passEncoder.draw( 4, 1, 0, 0 ); | ||
| passEncoder.endPass(); | ||
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| srcView = dstView; | ||
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| } | ||
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| this.device.defaultQueue.submit( [ commandEncoder.finish() ] ); | ||
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| } | ||
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| } | ||
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| export default WebGPUTextureUtils; |
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