vulkanTutorial/libs/glm-1.0.0/detail/func_geometric_simd.inl

/// @ref core
/// @file glm/detail/func_geometric_simd.inl

#include "../simd/geometric.h"

#if GLM_ARCH & GLM_ARCH_SSE2_BIT

namespace glm{
namespace detail
{
	template<qualifier Q>
	struct compute_length<4, float, Q, true>
	{
		GLM_FUNC_QUALIFIER static float call(vec<4, float, Q> const& v)
		{
			return _mm_cvtss_f32(glm_vec4_length(v.data));
		}
	};

	template<qualifier Q>
	struct compute_distance<4, float, Q, true>
	{
		GLM_FUNC_QUALIFIER static float call(vec<4, float, Q> const& p0, vec<4, float, Q> const& p1)
		{
			return _mm_cvtss_f32(glm_vec4_distance(p0.data, p1.data));
		}
	};

	template<qualifier Q>
	struct compute_dot<vec<4, float, Q>, float, true>
	{
		GLM_FUNC_QUALIFIER static float call(vec<4, float, Q> const& x, vec<4, float, Q> const& y)
		{
			return _mm_cvtss_f32(glm_vec1_dot(x.data, y.data));
		}
	};

	template<qualifier Q>
	struct compute_cross<float, Q, true>
	{
		GLM_FUNC_QUALIFIER static vec<3, float, Q> call(vec<3, float, Q> const& a, vec<3, float, Q> const& b)
		{
			__m128 const set0 = _mm_set_ps(0.0f, a.z, a.y, a.x);
			__m128 const set1 = _mm_set_ps(0.0f, b.z, b.y, b.x);
			__m128 const xpd0 = glm_vec4_cross(set0, set1);

			vec<4, float, Q> Result;
			Result.data = xpd0;
			return vec<3, float, Q>(Result);
		}
	};

	template<qualifier Q>
	struct compute_normalize<4, float, Q, true>
	{
		GLM_FUNC_QUALIFIER static vec<4, float, Q> call(vec<4, float, Q> const& v)
		{
			vec<4, float, Q> Result;
			Result.data = glm_vec4_normalize(v.data);
			return Result;
		}
	};

	template<qualifier Q>
	struct compute_faceforward<4, float, Q, true>
	{
		GLM_FUNC_QUALIFIER static vec<4, float, Q> call(vec<4, float, Q> const& N, vec<4, float, Q> const& I, vec<4, float, Q> const& Nref)
		{
			vec<4, float, Q> Result;
			Result.data = glm_vec4_faceforward(N.data, I.data, Nref.data);
			return Result;
		}
	};

	template<qualifier Q>
	struct compute_reflect<4, float, Q, true>
	{
		GLM_FUNC_QUALIFIER static vec<4, float, Q> call(vec<4, float, Q> const& I, vec<4, float, Q> const& N)
		{
			vec<4, float, Q> Result;
			Result.data = glm_vec4_reflect(I.data, N.data);
			return Result;
		}
	};

	template<qualifier Q>
	struct compute_refract<4, float, Q, true>
	{
		GLM_FUNC_QUALIFIER static vec<4, float, Q> call(vec<4, float, Q> const& I, vec<4, float, Q> const& N, float eta)
		{
			vec<4, float, Q> Result;
			Result.data = glm_vec4_refract(I.data, N.data, _mm_set1_ps(eta));
			return Result;
		}
	};
}//namespace detail
}//namespace glm

#elif GLM_ARCH & GLM_ARCH_NEON_BIT
namespace glm{
namespace detail
{
	template<qualifier Q>
	struct compute_length<4, float, Q, true>
	{
		GLM_FUNC_QUALIFIER static float call(vec<4, float, Q> const& v)
		{
			return sqrt(compute_dot<vec<4, float, Q>, float, true>::call(v, v));
		}
	};

	template<qualifier Q>
	struct compute_distance<4, float, Q, true>
	{
		GLM_FUNC_QUALIFIER static float call(vec<4, float, Q> const& p0, vec<4, float, Q> const& p1)
		{
			return compute_length<4, float, Q, true>::call(p1 - p0);
		}
	};


	template<qualifier Q>
	struct compute_dot<vec<4, float, Q>, float, true>
	{
		GLM_FUNC_QUALIFIER static float call(vec<4, float, Q> const& x, vec<4, float, Q> const& y)
		{
#if GLM_ARCH & GLM_ARCH_ARMV8_BIT
			float32x4_t v = vmulq_f32(x.data, y.data);
			return vaddvq_f32(v);
#else  // Armv7a with Neon
			float32x4_t p = vmulq_f32(x.data, y.data);
			float32x2_t v = vpadd_f32(vget_low_f32(p), vget_high_f32(p));
			v = vpadd_f32(v, v);
			return vget_lane_f32(v, 0);
#endif
		}
	};

	template<qualifier Q>
	struct compute_normalize<4, float, Q, true>
	{
		GLM_FUNC_QUALIFIER static vec<4, float, Q> call(vec<4, float, Q> const& v)
		{
			float32x4_t p = vmulq_f32(v.data, v.data);
#if GLM_ARCH & GLM_ARCH_ARMV8_BIT
			p = vpaddq_f32(p, p);
			p = vpaddq_f32(p, p);
#else
			float32x2_t t = vpadd_f32(vget_low_f32(p), vget_high_f32(p));
			t = vpadd_f32(t, t);
			p = vcombine_f32(t, t);
#endif

			float32x4_t vd = vrsqrteq_f32(p);
			vec<4, float, Q> Result;
			Result.data = vmulq_f32(v.data, vd);
			return Result;
		}
	};
}//namespace detail
}//namespace glm

#endif//GLM_ARCH & GLM_ARCH_SSE2_BIT