Visual Studio OpenMP 2.0 Support

[CeruleanSky]

If you want to support Visual Studio's OpenMP which is compiler flag"/openmp" , it has been at version OpenMP 2.0 for around a decade, and complains about size_t for the index and the error says it needs to be a signed int.

tinyraytracer/tinyraytracer.cpp

Lines 123 to 124 in 5888c49

	for (size_t j = 0; j<height; j++) { // actual rendering loop
	for (size_t i = 0; i<width; i++) {

So the above size_t index works when it changed to a signed int for VS compilers.

I didn't want to make a pull since I'm not quite sure what the best way to add "/openmp" to how you have your CMakeLists.txt arranged for Visual Studio.

[ssloy]

Thank you for pointing the stuff; I am not sure either how to add /openmp, let us keep the issue open for a little while.