workspaces/test/shaders/circle_mask_render.wgsl


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// Circle mask render shader
// Samples mask and draws green outside the circle

@group(0) @binding(0) var mask_tex: texture_2d<f32>;
@group(0) @binding(1) var mask_sampler: sampler;

#include "common_uniforms"
#include "render/fullscreen_vs"

@group(0) @binding(2) var<uniform> uniforms: CommonUniforms;

@fragment fn fs_main(@builtin(position) p: vec4<f32>) -> @location(0) vec4<f32> {
  let uv = p.xy / uniforms.resolution;
  let mask_value = textureSample(mask_tex, mask_sampler, uv).r;

  if (mask_value > 0.5) {
    discard;
  }

  return vec4<f32>(0.0, 1.0, 0.0, 1.0);
}