Bug 314588 – [WebGPU] iesna.eu/?wasm=skyglow_demo fails to compile shader

• Component: WebGPU
• Status: RESOLVED FIXED

[Mike Wyrzykowski]

error = 1 error generated while compiling the shader:
159:45: Expected one of '(', a literal, or an identifier

I'm guessing we don't handle this trailing 'f':
sample = clamp(_e13, vec3(0.0001f), vec3(34028235000000000000000000000000000000f));

WGSL source follows:
---------------------------------------------------------------------
struct BloomUniforms {
    threshold_precomputations: vec4<f32>,
    viewport: vec4<f32>,
    scale: vec2<f32>,
    aspect: f32,
}

@group(0) @binding(0) 
var input_texture: texture_2d<f32>;
@group(0) @binding(1) 
var s: sampler;
@group(0) @binding(2) 
var<uniform> uniforms: BloomUniforms;

fn soft_threshold(color: vec3<f32>) -> vec3<f32> {
    var softness: f32;
    var contribution: f32;

    let brightness = max(color.x, max(color.y, color.z));
    let _e9 = uniforms.threshold_precomputations.y;
    softness = (brightness - _e9);
    let _e12 = softness;
    let _e16 = uniforms.threshold_precomputations.z;
    softness = clamp(_e12, 0f, _e16);
    let _e19 = softness;
    let _e20 = softness;
    let _e25 = uniforms.threshold_precomputations.w;
    softness = ((_e19 * _e20) * _e25);
    let _e30 = uniforms.threshold_precomputations.x;
    let _e32 = softness;
    contribution = max((brightness - _e30), _e32);
    let _e37 = contribution;
    contribution = (_e37 / max(brightness, 0.00001f));
    let _e39 = contribution;
    return (color * _e39);
}

fn tonemapping_luminance(v: vec3<f32>) -> f32 {
    return dot(v, vec3<f32>(0.2126f, 0.7152f, 0.0722f));
}

fn karis_average(color_1: vec3<f32>) -> f32 {
    let _e1 = tonemapping_luminance(color_1);
    let luma = (_e1 / 4f);
    return (1f / (1f + luma));
}

fn sample_input_13_tap(uv_2: vec2<f32>) -> vec3<f32> {
    var group0_: vec3<f32>;
    var group1_: vec3<f32>;
    var group2_: vec3<f32>;
    var group3_: vec3<f32>;
    var group4_: vec3<f32>;

    let _e6 = textureSample(input_texture, s, uv_2, vec2<i32>(-2i, 2i));
    let a = _e6.xyz;
    let _e13 = textureSample(input_texture, s, uv_2, vec2<i32>(0i, 2i));
    let b = _e13.xyz;
    let _e20 = textureSample(input_texture, s, uv_2, vec2<i32>(2i, 2i));
    let c = _e20.xyz;
    let _e27 = textureSample(input_texture, s, uv_2, vec2<i32>(-2i, 0i));
    let d = _e27.xyz;
    let _e31 = textureSample(input_texture, s, uv_2);
    let e = _e31.xyz;
    let _e38 = textureSample(input_texture, s, uv_2, vec2<i32>(2i, 0i));
    let f = _e38.xyz;
    let _e45 = textureSample(input_texture, s, uv_2, vec2<i32>(-2i, -2i));
    let g = _e45.xyz;
    let _e52 = textureSample(input_texture, s, uv_2, vec2<i32>(0i, -2i));
    let h = _e52.xyz;
    let _e59 = textureSample(input_texture, s, uv_2, vec2<i32>(2i, -2i));
    let i = _e59.xyz;
    let _e66 = textureSample(input_texture, s, uv_2, vec2<i32>(-1i, 1i));
    let j = _e66.xyz;
    let _e73 = textureSample(input_texture, s, uv_2, vec2<i32>(1i, 1i));
    let k = _e73.xyz;
    let _e80 = textureSample(input_texture, s, uv_2, vec2<i32>(-1i, -1i));
    let l = _e80.xyz;
    let _e87 = textureSample(input_texture, s, uv_2, vec2<i32>(1i, -1i));
    let m = _e87.xyz;
    group0_ = ((((a + b) + d) + e) * 0.03125f);
    group1_ = ((((b + c) + e) + f) * 0.03125f);
    group2_ = ((((d + e) + g) + h) * 0.03125f);
    group3_ = ((((e + f) + h) + i) * 0.03125f);
    group4_ = ((((j + k) + l) + m) * 0.125f);
    let _e119 = group0_;
    let _e120 = karis_average(_e119);
    let _e121 = group0_;
    group0_ = (_e121 * _e120);
    let _e123 = group1_;
    let _e124 = karis_average(_e123);
    let _e125 = group1_;
    group1_ = (_e125 * _e124);
    let _e127 = group2_;
    let _e128 = karis_average(_e127);
    let _e129 = group2_;
    group2_ = (_e129 * _e128);
    let _e131 = group3_;
    let _e132 = karis_average(_e131);
    let _e133 = group3_;
    group3_ = (_e133 * _e132);
    let _e135 = group4_;
    let _e136 = karis_average(_e135);
    let _e137 = group4_;
    group4_ = (_e137 * _e136);
    let _e139 = group0_;
    let _e140 = group1_;
    let _e142 = group2_;
    let _e144 = group3_;
    let _e146 = group4_;
    return ((((_e139 + _e140) + _e142) + _e144) + _e146);
}

fn sample_input_3x3_tent(uv_3: vec2<f32>) -> vec3<f32> {
    var sample_1: vec3<f32>;

    let _e2 = uniforms.scale;
    let _e4 = textureDimensions(input_texture);
    let frag_size = (_e2 / vec2<f32>(_e4));
    let x = frag_size.x;
    let y = frag_size.y;
    let _e17 = textureSample(input_texture, s, vec2<f32>((uv_3.x - x), (uv_3.y + y)));
    let a_1 = _e17.xyz;
    let _e25 = textureSample(input_texture, s, vec2<f32>(uv_3.x, (uv_3.y + y)));
    let b_1 = _e25.xyz;
    let _e34 = textureSample(input_texture, s, vec2<f32>((uv_3.x + x), (uv_3.y + y)));
    let c_1 = _e34.xyz;
    let _e42 = textureSample(input_texture, s, vec2<f32>((uv_3.x - x), uv_3.y));
    let d_1 = _e42.xyz;
    let _e49 = textureSample(input_texture, s, vec2<f32>(uv_3.x, uv_3.y));
    let e_1 = _e49.xyz;
    let _e57 = textureSample(input_texture, s, vec2<f32>((uv_3.x + x), uv_3.y));
    let f_1 = _e57.xyz;
    let _e66 = textureSample(input_texture, s, vec2<f32>((uv_3.x - x), (uv_3.y - y)));
    let g_1 = _e66.xyz;
    let _e74 = textureSample(input_texture, s, vec2<f32>(uv_3.x, (uv_3.y - y)));
    let h_1 = _e74.xyz;
    let _e83 = textureSample(input_texture, s, vec2<f32>((uv_3.x + x), (uv_3.y - y)));
    let i_1 = _e83.xyz;
    sample_1 = (e_1 * 0.25f);
    let _e93 = sample_1;
    sample_1 = (_e93 + ((((b_1 + d_1) + f_1) + h_1) * 0.125f));
    let _e100 = sample_1;
    sample_1 = (_e100 + ((((a_1 + c_1) + g_1) + i_1) * 0.0625f));
    let _e102 = sample_1;
    return _e102;
}

@fragment 
fn downsample_first(@location(0) output_uv: vec2<f32>) -> @location(0) vec4<f32> {
    var sample: vec3<f32>;

    let _e2 = uniforms.viewport;
    let _e7 = uniforms.viewport;
    let sample_uv = (_e2.xy + (output_uv * _e7.zw));
    let _e11 = sample_input_13_tap(sample_uv);
    sample = _e11;
    let _e13 = sample;
    sample = clamp(_e13, vec3(0.0001f), vec3(34028235000000000000000000000000000000f));
    let _e19 = sample;
    return vec4<f32>(_e19, 1f);
}

@fragment 
fn downsample(@location(0) uv: vec2<f32>) -> @location(0) vec4<f32> {
    let _e1 = sample_input_13_tap(uv);
    return vec4<f32>(_e1, 1f);
}

@fragment 
fn upsample(@location(0) uv_1: vec2<f32>) -> @location(0) vec4<f32> {
    let _e1 = sample_input_3x3_tent(uv_1);
    return vec4<f32>(_e1, 1f);
}

[Radar WebKit Bug Importer]

<rdar://problem/176827607>

[Tadeu Zagallo]

Pull request: https://github.com/WebKit/WebKit/pull/64768

[EWS]

Committed 313133@main (7f23f03e34b0): <https://commits.webkit.org/313133@main>

Reviewed commits have been landed. Closing PR #64768 and removing active labels.