layout(webgpu,   set=1, texture=2, sampler=3) sampler2D wgpuSampler;
layout(direct3d, set=1, texture=4, sampler=5) sampler2D d3dSampler;
layout(vulkan,   set=1, binding=6)            sampler2D vkSampler;

void main() {
    sk_FragColor = sample(wgpuSampler, float2(0));
    sk_FragColor = sample(d3dSampler,  float2(0));
    sk_FragColor = sample(vkSampler,   float2(0));
}