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//TEST:SIMPLE:
// Confirm that basic `interface` syntax stuff type-checks.
// The example here is adapted from examples in Matt Pharr's
// chapter in GPU Gems: "An Introduction to Shader Interaces"
struct LightSample
{
float3 C; // radiance
float3 L; // direction
};
interface Light
{
LightSample illuminate(float3 P_world);
}
struct PointLight : Light
{
float3 Plight_world;
float3 C;
LightSample illuminate(float3 P_world)
{
float3 delta = Plight_world - P_world;
float3 L = normalize(delta);
float distance = length(delta);
LightSample result;
result.L = L;
result.C = C * (1 / (distance*distance));
return result;
}
};
// using the concrete type directly
float3 A( float3 P_world, PointLight light )
{
return light.illuminate(P_world).L;
}
// using the abstract interface type
float3 B( float3 P_world, Light light )
{
return light.illuminate(P_world).L;
}
//
float3 Test(float3 P_world, PointLight pointLight, Light light)
{
// dconcrete type expected, concrete type provided
float3 a = A(P_world, pointLight);
// abstract type expected, abstract type provided
float3 b = B(P_world, light);
// abstract type expected, concrete type provided
float3 c = B(P_world, pointLight);
// The remaining case (passing `Light` where `PointLight` is expected)
// should be an error, so we want a distinct test for that.
return a + b + c;
}
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