Add a helper class to easier test fragment and compute shader versions of the same...

[movit] / test_util.h

diff --git a/test_util.h b/test_util.h
index a5124bda164dfaf0b7926c95459c34d3325af213..a0767ad81b097920f60483188fdbb78e60a7728a 100644 (file)
--- a/test_util.h
+++ b/test_util.h
@@ -83,6 +83,30 @@ double srgb_to_linear(double x);
 // Undefined for values outside 0.0..1.0.
 double linear_to_srgb(double x);
 
+// A RAII class to pretend temporarily that we don't support compute shaders
+// even if we do. Useful for testing or benchmarking the fragment shader path
+// also on systems that support compute shaders.
+class DisableComputeShadersTemporarily
+{
+public:
+       // If disable_compute_shaders is false, this class effectively does nothing.
+       // Otherwise, sets movit_compute_shaders_supported unconditionally to false.
+       DisableComputeShadersTemporarily(bool disable_compute_shaders);
+
+       // Restore the old value of movit_compute_shaders_supported.
+       ~DisableComputeShadersTemporarily();
+
+       // Whether the current test should be skipped due to lack of compute shaders
+       // (ie., disable_compute_shaders was _false_, but the system does not support
+       // compute shaders). Will also output a message to stderr if so.
+       bool should_skip();
+
+       bool active() const { return disable_compute_shaders; }
+
+private:
+       bool disable_compute_shaders, saved_compute_shaders_supported;
+};
+
 }  // namespace movit
 
 #endif  // !defined(_MOVIT_TEST_UTIL_H)