Cycles: Make CUDA adaptive feature compile a Debug flag.

If the CUDA Toolkit is installed and the user is on Linux,
adaptive, feature based CUDA runtime compile is now possible to enable via:

* Environment flag CYCLES_CUDA_ADAPTIVE_COMPILE or
* Debug menu (Debug value 256) in the Cycles UI.

2 files changed, 30 insertions, 0 deletions

diff --git a/intern/cycles/util/util_debug.cpp b/intern/cycles/util/util_debug.cpp
index 448c6223765..80d177d2cae 100644
--- a/intern/cycles/util/util_debug.cpp
+++ b/intern/cycles/util/util_debug.cpp
@@ -57,6 +57,18 @@ void DebugFlags::CPU::reset()
 	qbvh = true;
 }
 
+DebugFlags::CUDA::CUDA()
+  : adaptive_compile(false)
+{
+	reset();
+}
+
+void DebugFlags::CUDA::reset()
+{
+	if(getenv("CYCLES_CUDA_ADAPTIVE_COMPILE") != NULL)
+		adaptive_compile = true;
+}
+
 DebugFlags::OpenCL::OpenCL()
   : device_type(DebugFlags::OpenCL::DEVICE_ALL),
     kernel_type(DebugFlags::OpenCL::KERNEL_DEFAULT),
@@ -123,6 +135,9 @@ std::ostream& operator <<(std::ostream &os,
 	   << "  SSE3   : " << string_from_bool(debug_flags.cpu.sse3)  << "\n"
 	   << "  SSE2   : " << string_from_bool(debug_flags.cpu.sse2)  << "\n";
 
+	os << "CUDA flags:\n"
+	   << " Adaptive Compile: " << string_from_bool(debug_flags.cuda.adaptive_compile) << "\n";
+
 	const char *opencl_device_type,
 	           *opencl_kernel_type;
 	switch(debug_flags.opencl.device_type) {
diff --git a/intern/cycles/util/util_debug.h b/intern/cycles/util/util_debug.h
index 6ec5188049d..641abcc0668 100644
--- a/intern/cycles/util/util_debug.h
+++ b/intern/cycles/util/util_debug.h
@@ -46,6 +46,18 @@ public:
 		bool qbvh;
 	};
 
+	/* Descriptor of CUDA feature-set to be used. */
+	struct CUDA {
+		CUDA();
+
+		/* Reset flags to their defaults. */
+		void reset();
+
+		/* Whether adaptive feature based runtime compile is enabled or not.
+		 * Requires the CUDA Toolkit and only works on Linux atm. */
+		bool adaptive_compile;
+	};
+
 	/* Descriptor of OpenCL feature-set to be used. */
 	struct OpenCL {
 		OpenCL();
@@ -107,6 +119,9 @@ public:
 	/* Requested CPU flags. */
 	CPU cpu;
 
+	/* Requested CUDA flags. */
+	CUDA cuda;
+
 	/* Requested OpenCL flags. */
 	OpenCL opencl;