When I try to run this the assert on line 64 always fails
assert (sizeof(map) == map_w * map_h + 1); // +1 for the null terminated string
because they are different sizes. When I checked with a std::cout statement it returned that sizeof(map) was 165 while map_w * map_h + 1 was 257. Is this not an issue on other computers? I'm just curious to see if I'm the only one that ran into this issue.

I used CLion, C++ 17, mingw.

Hi!
Please, add #include <cmath> after

Hi!
First of all thank you for great tutorials on 3D graphics.

There is an issue when building project on Windows with GCC. In initial commit in file tinyraycaster.cpp in function drop_ppm_image you have:

std::ofstream ofs(filename);
ofs << "P6\n" << w << " " << h << "\n255\n";

On Windows GCC replaces \n in output file with platform specific code 0x0D0A, what is incorrect (it should be 0x0A in the file). This result in incorrect *.ppm image representation.
This happens because of opening file in "text" mode. To fix this, file should be opened in "binary" mode, for example like this:

std::ofstream ofs;
ofs.open(filename, std::ofstream::out | std::ofstream::binary);
ofs << "P6\n" << w << " " << h << "\n255\n";

Then everything works correctly. I think this patch would not affect other platforms.

How much faster is the way to render without graphics libraries, and with the help of standard language functions as you have in the game? Would it be better to switch to sdl?

Thanks for your project!

I made a small port of it in rust: https://github.com/fistons/rust-tinyraycaster

Maybe this can interest you?

Cheers!

Currently it is rand()%255 but it should be rand()%256,
because of this 195841 colors will never be generated.