source/blender/gpu/shaders/material/gpu_shader_material_virtual_camera.glsl


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void node_virtual_camera_empty(vec3 co, out vec4 color, out float alpha)
{
  color = vec4(0.0);
  alpha = 0.0;
}

void node_virtual_camera(vec3 co, sampler2D ima, float mix, out vec4 color, out float alpha)
{
  if (mix == 1.0) {
    node_virtual_camera_empty(co, color, alpha);
    return;
  }

  color = texture(ima, co.xy);
  alpha = color.a;
}