workspaces/main/shaders/cnn/cnn_conv7x7.wgsl


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// 7x7 convolution with 49 samples
// Applies mat4 weights per sample

fn cnn_conv7x7(
  tex: texture_2d<f32>,
  samp: sampler,
  uv: vec2<f32>,
  resolution: vec2<f32>,
  weights: array<mat4x4<f32>, 49>,
  bias: vec4<f32>
) -> vec4<f32> {
  let step = 1.0 / resolution;
  var sum = bias;
  var idx = 0;

  for (var dy = -3; dy <= 3; dy++) {
    for (var dx = -3; dx <= 3; dx++) {
      let offset = vec2<f32>(f32(dx), f32(dy)) * step;
      let sample = textureSample(tex, samp, uv + offset);
      sum += weights[idx] * sample;
      idx++;
    }
  }

  return sum;
}