shader/Glm/core/intrinsic_geometric.inl

///////////////////////////////////////////////////////////////////////////////////
/// OpenGL Mathematics (glm.g-truc.net)
///
/// Copyright (c) 2005 - 2013 G-Truc Creation (www.g-truc.net)
/// Permission is hereby granted, free of charge, to any person obtaining a copy
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/// in the Software without restriction, including without limitation the rights
/// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
/// copies of the Software, and to permit persons to whom the Software is
/// furnished to do so, subject to the following conditions:
/// 
/// The above copyright notice and this permission notice shall be included in
/// all copies or substantial portions of the Software.
/// 
/// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
/// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
/// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
/// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
/// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
/// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
/// THE SOFTWARE.
///
/// @ref core
/// @file glm/core/intrinsic_geometric.inl
/// @date 2009-05-08 / 2011-06-15
/// @author Christophe Riccio
///////////////////////////////////////////////////////////////////////////////////

namespace glm{
namespace detail{

//length
GLM_FUNC_QUALIFIER __m128 sse_len_ps(__m128 x)
{
    __m128 dot0 = sse_dot_ps(x, x);
	__m128 sqt0 = _mm_sqrt_ps(dot0);
    return sqt0;
}

//distance
GLM_FUNC_QUALIFIER __m128 sse_dst_ps(__m128 p0, __m128 p1)
{
	__m128 sub0 = _mm_sub_ps(p0, p1);
    __m128 len0 = sse_len_ps(sub0);
    return len0;
}

//dot
GLM_FUNC_QUALIFIER __m128 sse_dot_ps(__m128 v1, __m128 v2)
{
#   if((GLM_ARCH & GLM_ARCH_SSE4) == GLM_ARCH_SSE4)
        return _mm_dp_ps(v1, v2, 0xff);
#   else
        __m128 mul0 = _mm_mul_ps(v1, v2);
        __m128 swp0 = _mm_shuffle_ps(mul0, mul0, _MM_SHUFFLE(2, 3, 0, 1));
        __m128 add0 = _mm_add_ps(mul0, swp0);
        __m128 swp1 = _mm_shuffle_ps(add0, add0, _MM_SHUFFLE(0, 1, 2, 3));
        __m128 add1 = _mm_add_ps(add0, swp1);
        return add1;
#   endif
}

// SSE1
GLM_FUNC_QUALIFIER __m128 sse_dot_ss(__m128 v1, __m128 v2)
{
	__m128 mul0 = _mm_mul_ps(v1, v2);
	__m128 mov0 = _mm_movehl_ps(mul0, mul0);
	__m128 add0 = _mm_add_ps(mov0, mul0);
	__m128 swp1 = _mm_shuffle_ps(add0, add0, 1);
	__m128 add1 = _mm_add_ss(add0, swp1);
	return add1;
}

//cross
GLM_FUNC_QUALIFIER __m128 sse_xpd_ps(__m128 v1, __m128 v2)
{
	__m128 swp0 = _mm_shuffle_ps(v1, v1, _MM_SHUFFLE(3, 0, 2, 1));
	__m128 swp1 = _mm_shuffle_ps(v1, v1, _MM_SHUFFLE(3, 1, 0, 2));
	__m128 swp2 = _mm_shuffle_ps(v2, v2, _MM_SHUFFLE(3, 0, 2, 1));
	__m128 swp3 = _mm_shuffle_ps(v2, v2, _MM_SHUFFLE(3, 1, 0, 2));
	__m128 mul0 = _mm_mul_ps(swp0, swp3);
	__m128 mul1 = _mm_mul_ps(swp1, swp2);
	__m128 sub0 = _mm_sub_ps(mul0, mul1);
	return sub0;
}

//normalize
GLM_FUNC_QUALIFIER __m128 sse_nrm_ps(__m128 v)
{
	__m128 dot0 = sse_dot_ps(v, v);
	__m128 isr0 = _mm_rsqrt_ps(dot0);
	__m128 mul0 = _mm_mul_ps(v, isr0);
	return mul0;
}

//faceforward
GLM_FUNC_QUALIFIER __m128 sse_ffd_ps(__m128 N, __m128 I, __m128 Nref)
{
	//__m128 dot0 = _mm_dot_ps(v, v);
	//__m128 neg0 = _mm_neg_ps(N);
	//__m128 sgn0 = _mm_sgn_ps(dot0);
	//__m128 mix0 = _mm_mix_ps(N, neg0, sgn0);
	//return mix0;

	__m128 dot0 = sse_dot_ps(Nref, I);
	__m128 sgn0 = sse_sgn_ps(dot0);
	__m128 mul0 = _mm_mul_ps(sgn0, glm::detail::minus_one);
	__m128 mul1 = _mm_mul_ps(N, mul0);
	return mul1;
}

//reflect
GLM_FUNC_QUALIFIER __m128 sse_rfe_ps(__m128 I, __m128 N)
{
	__m128 dot0 = sse_dot_ps(N, I);
	__m128 mul0 = _mm_mul_ps(N, dot0);
	__m128 mul1 = _mm_mul_ps(mul0, glm::detail::two);
	__m128 sub0 = _mm_sub_ps(I, mul1);
	return sub0;
}

//refract
GLM_FUNC_QUALIFIER __m128 sse_rfa_ps(__m128 I, __m128 N, __m128 eta)
{
	__m128 dot0 = sse_dot_ps(N, I);
	__m128 mul0 = _mm_mul_ps(eta, eta);
	__m128 mul1 = _mm_mul_ps(dot0, dot0);
	__m128 sub0 = _mm_sub_ps(glm::detail::one, mul0);
	__m128 sub1 = _mm_sub_ps(glm::detail::one, mul1);
	__m128 mul2 = _mm_mul_ps(sub0, sub1);
	
	if(_mm_movemask_ps(_mm_cmplt_ss(mul2, glm::detail::zero)) == 0)
		return glm::detail::zero;

	__m128 sqt0 = _mm_sqrt_ps(mul2);
	__m128 mul3 = _mm_mul_ps(eta, dot0);
	__m128 add0 = _mm_add_ps(mul3, sqt0);
	__m128 mul4 = _mm_mul_ps(add0, N);
	__m128 mul5 = _mm_mul_ps(eta, I);
	__m128 sub2 = _mm_sub_ps(mul5, mul4);

	return sub2;
}

}//namespace detail
}//namespace glm