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author | Kartik K. Agaram <vc@akkartik.com> | 2021-07-16 08:09:42 -0700 |
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committer | Kartik K. Agaram <vc@akkartik.com> | 2021-07-16 08:28:56 -0700 |
commit | 44d26b77c45668c9b0c99894a4294cec004361fe (patch) | |
tree | 68a5dcd4971873efd4ce184e9bf9a531c2161813 /linux/raytracing/main.cc | |
parent | ac45f097153afd3a89f43886e4124c5b2c26b98a (diff) | |
download | mu-44d26b77c45668c9b0c99894a4294cec004361fe.tar.gz |
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Diffstat (limited to 'linux/raytracing/main.cc')
-rw-r--r-- | linux/raytracing/main.cc | 112 |
1 files changed, 0 insertions, 112 deletions
diff --git a/linux/raytracing/main.cc b/linux/raytracing/main.cc deleted file mode 100644 index 35177279..00000000 --- a/linux/raytracing/main.cc +++ /dev/null @@ -1,112 +0,0 @@ -#include <iostream> - -// print float in some sort of intuitive hex that also helps visualize the underlying bits -void p(std::ostream &out, float f) { - int bits = *(int*)&f; - // sign - if (bits & 0x80000000) { - out << '-'; - } - // mantissa - int mantissa = bits & 0x007fffff; - int exponent = (bits & 0x7f800000) >> 23; - out << std::hex << mantissa << "P" << std::dec << (exponent-127); -} - -#include "color.h" -#include "ray.h" -#include "vec3.h" - -color ray_color(const ray& r) { -//? std::cerr << "r.dir: " << r.direction() << '\n'; -//? std::cerr << "r.dir length: "; -//? p(std::cerr, r.direction().length()); -//? std::cerr << '\n'; - vec3 unit_direction = unit_vector(r.direction()); -//? std::cerr << "r.dir normalized: " << unit_direction << '\n'; - float t = 0.5*(unit_direction.y() + 1.0); -//? std::cerr << "t: "; -//? p(std::cerr, t); -//? std::cerr << '\n'; - vec3 whitening = (1.0-t)*color(1.0, 1.0, 1.0); -//? std::cerr << "whitening: "; -//? p(std::cerr, whitening.x()); -//? std::cerr << " "; -//? p(std::cerr, whitening.y()); -//? std::cerr << " "; -//? p(std::cerr, whitening.z()); -//? std::cerr << "\n"; - vec3 base = t*color(0.5, 0.7, 1.0); -//? std::cerr << "base: "; -//? p(std::cerr, base.x()); -//? std::cerr << " "; -//? p(std::cerr, base.y()); -//? std::cerr << " "; -//? p(std::cerr, base.z()); -//? std::cerr << "\n"; - vec3 result = base + whitening; -//? std::cerr << "result: "; -//? p(std::cerr, result.x()); -//? std::cerr << " "; -//? p(std::cerr, result.y()); -//? std::cerr << " "; -//? p(std::cerr, result.z()); -//? std::cerr << "\n"; - return result; -} - -int main() { - - // Image - const float aspect_ratio = 16.0 / 9.0; -//? std::cerr << "aspect ratio: " << aspect_ratio << ' ' << std::hex << *(int*)&aspect_ratio << '\n'; - const int image_width = 400; - const int image_height = static_cast<int>(image_width / aspect_ratio); - - // Camera - - float viewport_height = 2.0; -//? std::cerr << "viewport height: " << viewport_height << ' ' << std::hex << *(int*)&viewport_height << '\n'; - float viewport_width = aspect_ratio * viewport_height; -//? std::cerr << "viewport width: " << viewport_width << ' ' << std::hex << *(int*)&viewport_width << '\n'; - float focal_length = 1.0; - - auto origin = point3(0, 0, 0); - auto horizontal = vec3(viewport_width, 0, 0); - auto vertical = vec3(0, viewport_height, 0); - auto lower_left_corner = origin - horizontal/2 - vertical/2 - vec3(0, 0, focal_length); - - // Render - - std::cout << "P3\n" << image_width << " " << image_height << "\n255\n"; - - for (int j = image_height-1; j >= 0; --j) { -//? std::cerr << "\rScanlines remaining: " << j << ' ' << std::flush; - for (int i = 0; i < image_width; ++i) { - auto u = float(i) / (image_width-1); -//? std::cerr << "u: " << u << '\n'; - auto v = float(j) / (image_height-1); - ray r(origin, lower_left_corner + u*horizontal + v*vertical - origin); -//? std::cerr << "ray origin: " << r.orig.x() << " " << r.orig.y() << " " << r.orig.z() << '\n'; -//? std::cerr << "ray direction: " << r.dir.x() << " " << r.dir.y() << " " << r.dir.z() << '\n'; -//? std::cerr << "ray dir.x: " << r.dir.x() << " "; -//? p(std::cerr, r.dir.x()); -//? std::cerr << '\n'; - color pixel_color = ray_color(r); -//? std::cerr << "pixel color: " << pixel_color.x() << " " << pixel_color.y() << " " << pixel_color.z() << '\n'; - -//? std::cout << "("; -//? p(std::cout, pixel_color.x()); -//? std::cout << ", "; -//? p(std::cout, pixel_color.y()); -//? std::cout << ", "; -//? p(std::cout, pixel_color.z()); -//? std::cout << ")\n"; - write_color(std::cout, pixel_color); -//? break; - } -//? break; - } - -//? std::cerr << "\r"; -} |