Minor include tweak + info on unit tests

* Minor include tweak to make RadeonRays compile straight to Unity without modification.
* Add some info on how to run/prepare unit tests

Author: FlorentGuinier

README.md

@@ -144,6 +144,9 @@ The app only supports loading of pure triangle .obj meshes. The list of supporte
 - dds (limited support)
 - tga
 
+## Run unit tests
+They need to be run from the <Radeon Rays_SDK path>/UnitTest path.
+Premake should be runned with the `--safe_math` option.
 
 # Hardware  support
 

RadeonRays/include/math/matrix.h

@@ -181,7 +181,7 @@ namespace RadeonRays
 
     inline float4 operator * (matrix const& m, float4 const& v)
     {
-        float4 res {0, 0, 0, 0};
+        float4 res(0, 0, 0, 0);
 
         for (int i = 0; i < 4; ++i) {
             //res[i] = 0.f;

RadeonRays/include/radeon_rays.h

@@ -28,6 +28,7 @@ THE SOFTWARE.
 #include "math/matrix.h"
 #include "math/ray.h"
 #include "math/mathutils.h"
+#include <cstdint>
 
 #define RADEONRAYS_API_VERSION 2.0