e955c94ed3
Listing the "Blender Foundation" as copyright holder implied the Blender Foundation holds copyright to files which may include work from many developers. While keeping copyright on headers makes sense for isolated libraries, Blender's own code may be refactored or moved between files in a way that makes the per file copyright holders less meaningful. Copyright references to the "Blender Foundation" have been replaced with "Blender Authors", with the exception of `./extern/` since these this contains libraries which are more isolated, any changed to license headers there can be handled on a case-by-case basis. Some directories in `./intern/` have also been excluded: - `./intern/cycles/` it's own `AUTHORS` file is planned. - `./intern/opensubdiv/`. An "AUTHORS" file has been added, using the chromium projects authors file as a template. Design task: #110784 Ref !110783.
111 lines
3.3 KiB
C++
111 lines
3.3 KiB
C++
/* SPDX-FileCopyrightText: 2019 Blender Authors
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*
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* SPDX-License-Identifier: GPL-2.0-or-later */
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/** \file
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* \ingroup EEVEE
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*/
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#include "eevee_private.h"
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#include "BLI_rand.h"
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void EEVEE_sample_ball(int sample_ofs, float radius, float rsample[3])
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{
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double ht_point[3];
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double ht_offset[3] = {0.0, 0.0, 0.0};
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const uint ht_primes[3] = {2, 3, 7};
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BLI_halton_3d(ht_primes, ht_offset, sample_ofs, ht_point);
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/* De-correlate AA and shadow samples. (see #68594) */
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ht_point[0] = fmod(ht_point[0] * 1151.0, 1.0);
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ht_point[1] = fmod(ht_point[1] * 1069.0, 1.0);
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ht_point[2] = fmod(ht_point[2] * 1151.0, 1.0);
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float omega = ht_point[1] * 2.0f * M_PI;
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rsample[2] = ht_point[0] * 2.0f - 1.0f; /* cos theta */
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float r = sqrtf(fmaxf(0.0f, 1.0f - rsample[2] * rsample[2])); /* sin theta */
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rsample[0] = r * cosf(omega);
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rsample[1] = r * sinf(omega);
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radius *= sqrt(sqrt(ht_point[2]));
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mul_v3_fl(rsample, radius);
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}
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void EEVEE_sample_rectangle(int sample_ofs,
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const float x_axis[3],
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const float y_axis[3],
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float size_x,
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float size_y,
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float rsample[3])
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{
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double ht_point[2];
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double ht_offset[2] = {0.0, 0.0};
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const uint ht_primes[2] = {2, 3};
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BLI_halton_2d(ht_primes, ht_offset, sample_ofs, ht_point);
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/* De-correlate AA and shadow samples. (see #68594) */
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ht_point[0] = fmod(ht_point[0] * 1151.0, 1.0);
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ht_point[1] = fmod(ht_point[1] * 1069.0, 1.0);
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/* Change distribution center to be 0,0 */
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ht_point[0] = (ht_point[0] > 0.5f) ? ht_point[0] - 1.0f : ht_point[0];
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ht_point[1] = (ht_point[1] > 0.5f) ? ht_point[1] - 1.0f : ht_point[1];
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zero_v3(rsample);
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madd_v3_v3fl(rsample, x_axis, (ht_point[0] * 2.0f) * size_x);
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madd_v3_v3fl(rsample, y_axis, (ht_point[1] * 2.0f) * size_y);
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}
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void EEVEE_sample_ellipse(int sample_ofs,
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const float x_axis[3],
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const float y_axis[3],
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float size_x,
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float size_y,
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float rsample[3])
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{
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double ht_point[2];
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double ht_offset[2] = {0.0, 0.0};
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const uint ht_primes[2] = {2, 3};
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BLI_halton_2d(ht_primes, ht_offset, sample_ofs, ht_point);
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/* Decorrelate AA and shadow samples. (see #68594) */
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ht_point[0] = fmod(ht_point[0] * 1151.0, 1.0);
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ht_point[1] = fmod(ht_point[1] * 1069.0, 1.0);
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/* Uniform disc sampling. */
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float omega = ht_point[1] * 2.0f * M_PI;
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float r = sqrtf(ht_point[0]);
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ht_point[0] = r * cosf(omega) * size_x;
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ht_point[1] = r * sinf(omega) * size_y;
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zero_v3(rsample);
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madd_v3_v3fl(rsample, x_axis, ht_point[0]);
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madd_v3_v3fl(rsample, y_axis, ht_point[1]);
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}
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void EEVEE_random_rotation_m4(int sample_ofs, float scale, float r_mat[4][4])
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{
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double ht_point[3];
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double ht_offset[3] = {0.0, 0.0, 0.0};
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const uint ht_primes[3] = {2, 3, 5};
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BLI_halton_3d(ht_primes, ht_offset, sample_ofs, ht_point);
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/* Decorrelate AA and shadow samples. (see #68594) */
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ht_point[0] = fmod(ht_point[0] * 1151.0, 1.0);
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ht_point[1] = fmod(ht_point[1] * 1069.0, 1.0);
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ht_point[2] = fmod(ht_point[2] * 1151.0, 1.0);
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rotate_m4(r_mat, 'X', ht_point[0] * scale);
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rotate_m4(r_mat, 'Y', ht_point[1] * scale);
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rotate_m4(r_mat, 'Z', ht_point[2] * scale);
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}
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