30a22b92ca
This commit updates all defines, compiler flags and cleans up some code for unused CPU capabilities. There should be no functional change, unless it's run on a CPU that supports sse41 but not sse42. It will fallback to the SSE2 kernel in this case. In preparation for the new SSE4.2 minimum in Blender 4.2. Pull Request: https://projects.blender.org/blender/blender/pulls/118043
85 lines
2.9 KiB
C
85 lines
2.9 KiB
C
/* SPDX-FileCopyrightText: 2011-2022 Blender Foundation
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0 */
|
|
|
|
#pragma once
|
|
|
|
CCL_NAMESPACE_BEGIN
|
|
|
|
/* Custom cross and dot implementations that match Embree bit for bit.
|
|
* Normally we don't use SSE41/AVX outside the kernel, but for this it's
|
|
* important to match exactly for ray tracing precision. */
|
|
|
|
ccl_device_forceinline float3 transform_inverse_cross(const float3 a_, const float3 b_)
|
|
{
|
|
#if defined(__AVX2__) && defined(__KERNEL_SSE2__)
|
|
const __m128 a = (const __m128 &)a_;
|
|
const __m128 b = (const __m128 &)b_;
|
|
const __m128 a_shuffle = _mm_castsi128_ps(
|
|
_mm_shuffle_epi32(_mm_castps_si128(a), _MM_SHUFFLE(3, 0, 2, 1)));
|
|
const __m128 b_shuffle = _mm_castsi128_ps(
|
|
_mm_shuffle_epi32(_mm_castps_si128(b), _MM_SHUFFLE(3, 0, 2, 1)));
|
|
const __m128 r = _mm_castsi128_ps(
|
|
_mm_shuffle_epi32(_mm_castps_si128(_mm_fmsub_ps(a, b_shuffle, _mm_mul_ps(a_shuffle, b))),
|
|
_MM_SHUFFLE(3, 0, 2, 1)));
|
|
return (const float3 &)r;
|
|
#endif
|
|
|
|
return cross(a_, b_);
|
|
}
|
|
|
|
ccl_device_forceinline float transform_inverse_dot(const float3 a_, const float3 b_)
|
|
{
|
|
#if defined(__KERNEL_SSE__) && defined(__KERNEL_SSE42__)
|
|
const __m128 a = (const __m128 &)a_;
|
|
const __m128 b = (const __m128 &)b_;
|
|
return _mm_cvtss_f32(_mm_dp_ps(a, b, 0x7F));
|
|
#endif
|
|
|
|
return dot(a_, b_);
|
|
}
|
|
|
|
ccl_device_forceinline Transform transform_inverse_impl(const Transform tfm)
|
|
{
|
|
/* This implementation matches the one in Embree exactly, to ensure consistent
|
|
* results with the ray intersection of instances. */
|
|
float3 x = make_float3(tfm.x.x, tfm.y.x, tfm.z.x);
|
|
float3 y = make_float3(tfm.x.y, tfm.y.y, tfm.z.y);
|
|
float3 z = make_float3(tfm.x.z, tfm.y.z, tfm.z.z);
|
|
float3 w = make_float3(tfm.x.w, tfm.y.w, tfm.z.w);
|
|
|
|
/* Compute determinant. */
|
|
float det = transform_inverse_dot(x, transform_inverse_cross(y, z));
|
|
|
|
if (det == 0.0f) {
|
|
/* Matrix is degenerate (e.g. 0 scale on some axis), ideally we should
|
|
* never be in this situation, but try to invert it anyway with tweak.
|
|
*
|
|
* This logic does not match Embree which would just give an invalid
|
|
* matrix. A better solution would be to remove this and ensure any object
|
|
* matrix is valid. */
|
|
x.x += 1e-8f;
|
|
y.y += 1e-8f;
|
|
z.z += 1e-8f;
|
|
|
|
det = transform_inverse_dot(x, cross(y, z));
|
|
if (det == 0.0f) {
|
|
det = FLT_MAX;
|
|
}
|
|
}
|
|
|
|
/* Divide adjoint matrix by the determinant to compute inverse of 3x3 matrix. */
|
|
const float3 inverse_x = transform_inverse_cross(y, z) / det;
|
|
const float3 inverse_y = transform_inverse_cross(z, x) / det;
|
|
const float3 inverse_z = transform_inverse_cross(x, y) / det;
|
|
|
|
/* Compute translation and fill transform. */
|
|
Transform itfm;
|
|
itfm.x = float3_to_float4(inverse_x, -transform_inverse_dot(inverse_x, w));
|
|
itfm.y = float3_to_float4(inverse_y, -transform_inverse_dot(inverse_y, w));
|
|
itfm.z = float3_to_float4(inverse_z, -transform_inverse_dot(inverse_z, w));
|
|
|
|
return itfm;
|
|
}
|
|
CCL_NAMESPACE_END
|