Support chaining certain effects after compute shaders.

[movit] / effect.h

diff --git a/effect.h b/effect.h
index afac5dc91c840ad6f273786498c1233547927343..ba39d6a3cf5bbdc88503214062fd6e075c3da48e 100644 (file)
--- a/effect.h
+++ b/effect.h
@@ -196,7 +196,16 @@ public:
        // set sets_virtual_output_size(), though.
        //
        // Does not make a lot of sense together with needs_texture_bounce().
-       virtual bool one_to_one_sampling() const { return false; }
+       // Cannot be set for compute shaders.
+       virtual bool one_to_one_sampling() const { return strong_one_to_one_sampling(); }
+
+       // Similar in use to one_to_one_sampling(), but even stricter:
+       // The effect must not use texture coordinate in any way beyond
+       // giving it unmodified to its (single) input. This allows it to
+       // also be used after a compute shader, in the same phase.
+       //
+       // An effect that it strong one-to-one must also be one-to-one.
+       virtual bool strong_one_to_one_sampling() const { return false; }
 
        // Whether this effect wants to output to a different size than
        // its input(s) (see inform_input_size(), below). See also