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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,108 @@ | ||
| #pragma once | ||
|
|
||
| #include <amp.h> | ||
| #include <amp_math.h> | ||
| #include "raycommon.h" | ||
|
|
||
| class geometry | ||
| { | ||
| public: | ||
| enum geometry_type | ||
| { | ||
| geometry_none, | ||
| geometry_sphere, | ||
| geometry_plane | ||
| }; | ||
|
|
||
| template <typename fp_t> | ||
| intersect_result<fp_t> intersect(const ray<fp_t>& ray) const restrict(amp) | ||
| { | ||
| switch (type) | ||
| { | ||
| case geometry_sphere: | ||
| return static_cast<const sphere<fp_t>*>(this)->intersect_impl(ray); | ||
| case geometry_plane: | ||
| return static_cast<const plane<fp_t>*>(this)->intersect_impl(ray); | ||
| default: | ||
| return intersect_result<fp_t>(); | ||
| } | ||
| } | ||
| protected: | ||
| geometry(int type, int material) restrict(cpu, amp) : material(material), type(type) {} | ||
| int material; | ||
| private: | ||
| int type; | ||
| }; | ||
|
|
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| template <typename fp_t> | ||
| class sphere : public geometry | ||
| { | ||
| public: | ||
| vector3<fp_t> center; | ||
| fp_t radius; | ||
|
|
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| explicit sphere(const vector3<fp_t>& center, fp_t radius, int material) restrict(cpu, amp) : geometry(geometry_sphere, material), center(center), radius(radius) { init(); } | ||
|
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| intersect_result<fp_t> intersect_impl(const ray<fp_t>& ray) const restrict(amp) | ||
| { | ||
| vector3<fp_t> v = ray.origin - center; | ||
| fp_t a0 = v.sqr_length() - sqr_radius; | ||
| fp_t d_dot_v = ray.direction.dot(v); | ||
|
|
||
| if (d_dot_v <= 0 ) | ||
| { | ||
| fp_t discr = d_dot_v * d_dot_v - a0; | ||
| fp_t distance = -d_dot_v - gpu::sqrt(discr); | ||
| vector3<fp_t> position(ray.get_point(distance)); | ||
|
|
||
| if (discr >= 0) | ||
| { | ||
| return intersect_result<fp_t>( | ||
| true, | ||
| material, | ||
| distance, | ||
| position, | ||
| (position - center).normalize() | ||
| ); | ||
|
|
||
| } | ||
| } | ||
|
|
||
| return intersect_result<fp_t>(); | ||
| } | ||
|
|
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| private: | ||
| fp_t sqr_radius; | ||
| void init() | ||
| { | ||
| sqr_radius = radius * radius; | ||
| } | ||
| }; | ||
|
|
||
| template <typename fp_t> | ||
| class plane : public geometry | ||
| { | ||
| public: | ||
| vector3<fp_t> normal; | ||
| fp_t d; | ||
|
|
||
| explicit plane(const vector3<fp_t>& normal, fp_t d, int material) restrict(cpu, amp) : geometry(geometry_plane, material), normal(normal), d(d) { init(); } | ||
|
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||
| intersect_result<fp_t> intersect_impl(const ray<fp_t>& ray) const restrict(amp) | ||
| { | ||
| fp_t a = ray.direction.dot(normal); | ||
|
|
||
| if (a >= 0) return intersect_result<fp_t>(); | ||
|
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||
| fp_t b = normal.dot(ray.origin - position); | ||
| fp_t distance = -b / a; | ||
|
|
||
| return intersect_result<fp_t>(true, material, distance, ray.get_point(distance), normal); | ||
| } | ||
| private: | ||
| vector3<fp_t> position; | ||
| void init() | ||
| { | ||
| position = normal * d; | ||
| } | ||
| }; |
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