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feat(layers): port BitmapLayer to WebGPU #10470
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,145 @@ | ||
| // deck.gl | ||
| // SPDX-License-Identifier: MIT | ||
| // Copyright (c) vis.gl contributors | ||
|
|
||
| export default /* wgsl */ `\ | ||
| struct Attributes { | ||
| @location(0) positions: vec3<f32>, | ||
| @location(1) positions64Low: vec3<f32>, | ||
| @location(2) texCoords: vec2<f32>, | ||
| }; | ||
|
|
||
| struct Varyings { | ||
| @builtin(position) position: vec4<f32>, | ||
| @location(0) vTexCoord: vec2<f32>, | ||
| @location(1) vTexPos: vec2<f32>, | ||
| @location(2) pickingColor: vec3<f32>, | ||
| @location(3) pickingDepth: f32, | ||
| }; | ||
|
|
||
| // from degrees to Web Mercator | ||
| fn lnglat_to_mercator(lnglat: vec2<f32>) -> vec2<f32> { | ||
| let x = lnglat.x; | ||
| let y = clamp(lnglat.y, -89.9, 89.9); | ||
| return vec2<f32>( | ||
| radians(x) + PI, | ||
| PI + log(tan(PI * 0.25 + radians(y) * 0.5)) | ||
| ) * WORLD_SCALE; | ||
| } | ||
|
|
||
| // from Web Mercator to degrees | ||
| fn mercator_to_lnglat(xy: vec2<f32>) -> vec2<f32> { | ||
| let position = xy / WORLD_SCALE; | ||
| return degrees(vec2<f32>( | ||
| position.x - PI, | ||
| atan(exp(position.y - PI)) * 2.0 - PI * 0.5 | ||
| )); | ||
| } | ||
|
|
||
| fn color_desaturate(colorValue: vec3<f32>) -> vec3<f32> { | ||
| let luminance = (colorValue.r + colorValue.g + colorValue.b) * 0.333333333; | ||
| return mix(colorValue, vec3<f32>(luminance), bitmap.desaturate); | ||
| } | ||
|
|
||
| fn color_tint(colorValue: vec3<f32>) -> vec3<f32> { | ||
| return colorValue * bitmap.tintColor; | ||
| } | ||
|
|
||
| fn apply_opacity(colorValue: vec3<f32>, alpha: f32) -> vec4<f32> { | ||
| if (bitmap.transparentColor.a == 0.0) { | ||
| return vec4<f32>(colorValue, alpha); | ||
| } | ||
| let blendedAlpha = alpha + bitmap.transparentColor.a * (1.0 - alpha); | ||
| let highLightRatio = alpha / blendedAlpha; | ||
| let blendedRGB = mix(bitmap.transparentColor.rgb, colorValue, highLightRatio); | ||
| return vec4<f32>(blendedRGB, blendedAlpha); | ||
| } | ||
|
|
||
| fn getUV(position: vec2<f32>) -> vec2<f32> { | ||
| return vec2<f32>( | ||
| (position.x - bitmap.bounds[0]) / (bitmap.bounds[2] - bitmap.bounds[0]), | ||
| (position.y - bitmap.bounds[3]) / (bitmap.bounds[1] - bitmap.bounds[3]) | ||
| ); | ||
| } | ||
|
|
||
| // Pack the top 12 bits of two normalized floats into three 8-bit values. | ||
| fn packUVsIntoRGB(uv: vec2<f32>) -> vec3<f32> { | ||
| let uv8bit = floor(uv * 256.0); | ||
| let uvFraction = fract(uv * 256.0); | ||
| let uvFraction4bit = floor(uvFraction * 16.0); | ||
| let fractions = uvFraction4bit.x + uvFraction4bit.y * 16.0; | ||
| return vec3<f32>(uv8bit, fractions) / 255.0; | ||
| } | ||
|
|
||
| @vertex | ||
| fn vertexMain(attributes: Attributes) -> Varyings { | ||
| var output: Varyings; | ||
| geometry.worldPosition = attributes.positions; | ||
| geometry.uv = attributes.texCoords; | ||
| geometry.pickingColor = picking_getPickingColorFromIndex(0u); | ||
|
|
||
| let projectedPosition = project_position_to_clipspace_and_commonspace( | ||
| attributes.positions, | ||
| attributes.positions64Low, | ||
| vec3<f32>(0.0) | ||
| ); | ||
| geometry.position = projectedPosition.commonPosition; | ||
| output.position = projectedPosition.clipPosition; | ||
| output.vTexCoord = attributes.texCoords; | ||
| output.vTexPos = vec2<f32>(0.0); | ||
| output.pickingColor = geometry.pickingColor; | ||
| output.pickingDepth = output.position.z / output.position.w; | ||
|
|
||
| if (bitmap.coordinateConversion < -0.5) { | ||
| output.vTexPos = geometry.position.xy + project.commonOrigin.xy; | ||
| } else if (bitmap.coordinateConversion > 0.5) { | ||
| output.vTexPos = geometry.worldPosition.xy; | ||
| } | ||
|
|
||
| return output; | ||
| } | ||
|
|
||
| @fragment | ||
| fn fragmentMain(input: Varyings) -> @location(0) vec4<f32> { | ||
| var uv = input.vTexCoord; | ||
| if (bitmap.coordinateConversion < -0.5) { | ||
| uv = getUV(mercator_to_lnglat(input.vTexPos)); | ||
| } else if (bitmap.coordinateConversion > 0.5) { | ||
| uv = getUV(lnglat_to_mercator(input.vTexPos)); | ||
| } | ||
|
|
||
| let bitmapColor = textureSample(bitmapTexture, bitmapTextureSampler, uv); | ||
| var fragColor = apply_opacity( | ||
| color_tint(color_desaturate(bitmapColor.rgb)), | ||
| bitmapColor.a * layer.opacity | ||
| ); | ||
|
|
||
| geometry.uv = uv; | ||
|
|
||
| if (picking.isActive > 0.5) { | ||
| if (picking.isAttribute > 0.5) { | ||
| return vec4<f32>(input.pickingDepth, 0.0, 0.0, 1.0); | ||
| } | ||
| return vec4<f32>(packUVsIntoRGB(uv), 1.0); | ||
| } | ||
|
|
||
| if (picking.isHighlightActive > 0.5) { | ||
| let highlightedObjectColor = picking_normalizeColor(picking.highlightedObjectColor); | ||
| if (picking_isColorZero(abs(input.pickingColor - highlightedObjectColor))) { | ||
| let highLightAlpha = picking.highlightColor.a; | ||
| let blendedAlpha = highLightAlpha + fragColor.a * (1.0 - highLightAlpha); | ||
| if (blendedAlpha > 0.0) { | ||
| let highLightRatio = highLightAlpha / blendedAlpha; | ||
| fragColor = vec4<f32>( | ||
| mix(fragColor.rgb, picking.highlightColor.rgb, highLightRatio), | ||
| blendedAlpha | ||
| ); | ||
| } else { | ||
| fragColor = vec4<f32>(fragColor.rgb, 0.0); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| return deckgl_premultiplied_alpha(fragColor); | ||
| } | ||
| `; | ||
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