Cycles: Make experimental kernel build option more generic

Previously it was explicitly mentioning it's NVidia kernel related option,
but in fact it's also handy for the OpenCL kernel.

intern/cycles/device/device_cuda.cpp

@@ -281,7 +281,7 @@ public:
 			nvcc, major, minor, machine, kernel.c_str(), cubin.c_str(), include.c_str(), cuda_version);
 		
 		if(experimental)
-			command += " -D__KERNEL_CUDA_EXPERIMENTAL__";
+			command += " -D__KERNEL_EXPERIMENTAL__";
 
 		if(getenv("CYCLES_CUDA_EXTRA_CFLAGS")) {
 			command += string(" ") + getenv("CYCLES_CUDA_EXTRA_CFLAGS");

intern/cycles/kernel/CMakeLists.txt

@@ -191,7 +191,7 @@ if(WITH_CYCLES_CUDA_BINARIES)
 
 	macro(CYCLES_CUDA_KERNEL_ADD arch experimental)
 		if(${experimental})
-			set(cuda_extra_flags "-D__KERNEL_CUDA_EXPERIMENTAL__")
+			set(cuda_extra_flags "-D__KERNEL_EXPERIMENTAL__")
 			set(cuda_cubin kernel_experimental_${arch}.cubin)
 		else()
 			set(cuda_extra_flags "")

intern/cycles/kernel/SConscript

@@ -87,7 +87,7 @@ if env['WITH_BF_CYCLES_CUDA_BINARIES']:
     last_cubin_file = None
 
     configs = (("kernel_%s.cubin", ''),
-               ("kernel_experimental_%s.cubin", ' -D__KERNEL_CUDA_EXPERIMENTAL__'))
+               ("kernel_experimental_%s.cubin", ' -D__KERNEL_EXPERIMENTAL__'))
 
     # add command for each cuda architecture
     for arch in cuda_archs:

intern/cycles/kernel/geom/geom_triangle_intersect.h

@@ -50,7 +50,7 @@ typedef struct IsectPrecalc {
 } IsectPrecalc;
 
 /* Workaround for CUDA toolkit 6.5.16. */
-#if defined(__KERNEL_CPU__) || !defined(__KERNEL_CUDA_EXPERIMENTAL__) || __CUDA_ARCH__ < 500
+#if defined(__KERNEL_CPU__) || !defined(__KERNEL_EXPERIMENTAL__) || __CUDA_ARCH__ < 500
 #  if (defined(i386) || defined(_M_IX86))
 ccl_device_noinline
 #  else

intern/cycles/kernel/kernel_types.h

@@ -84,7 +84,7 @@ CCL_NAMESPACE_BEGIN
 #define __VOLUME_SCATTER__
 
 /* Experimental on GPU */
-#ifdef __KERNEL_CUDA_EXPERIMENTAL__
+#ifdef __KERNEL_EXPERIMENTAL__
 #define __SUBSURFACE__
 #define __CMJ__
 #endif