Differential D2592 Diff 8522 intern/cycles/filter/filter_transform_gpu.h

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intern/cycles/filter/filter_transform_gpu.h

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				/*
				* Copyright 2011-2017 Blender Foundation
				*
				* Licensed under the Apache License, Version 2.0 (the "License");
				* you may not use this file except in compliance with the License.
				* You may obtain a copy of the License at
				*
				* http://www.apache.org/licenses/LICENSE-2.0
				*
				* Unless required by applicable law or agreed to in writing, software
				* distributed under the License is distributed on an "AS IS" BASIS,
				* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
				* See the License for the specific language governing permissions and
				* limitations under the License.
				*/

				CCL_NAMESPACE_BEGIN

				ccl_device void kernel_filter_construct_transform(int sample,
				ccl_global float ccl_readonly_ptr buffer,
				int x, int y, int4 rect,
				int pass_stride,
				ccl_global float *transform,
				ccl_global int *rank,
				int radius, bool relative_pca,
				int transform_stride, int localIdx)
				{
				int buffer_w = align_up(rect.z - rect.x, 4);

				ccl_local float shared_features[DENOISE_FEATURES*CCL_MAX_LOCAL_SIZE];
				ccl_local_param float features = shared_features + localIdxDENOISE_FEATURES;

				/* === Calculate denoising window. === */
				int2 low = make_int2(max(rect.x, x - radius),
				max(rect.y, y - radius));
				int2 high = make_int2(min(rect.z, x + radius + 1),
				min(rect.w, y + radius + 1));
				ccl_global float ccl_readonly_ptr pixel_buffer;
				int2 pixel;




				/* === Shift feature passes to have mean 0. === */
				float feature_means[DENOISE_FEATURES];
				math_vector_zero(feature_means, DENOISE_FEATURES);
				FOR_PIXEL_WINDOW {
				filter_get_features(pixel, pixel_buffer, features, NULL, pass_stride);
				math_vector_add(feature_means, features, DENOISE_FEATURES);
				} END_FOR_PIXEL_WINDOW

				float pixel_scale = 1.0f / ((high.y - low.y) * (high.x - low.x));
				math_vector_scale(feature_means, pixel_scale, DENOISE_FEATURES);

				/* === Scale the shifted feature passes to a range of [-1; 1], will be baked into the transform later. === */
				float feature_scale[DENOISE_FEATURES];
				math_vector_zero(feature_scale, DENOISE_FEATURES);

				FOR_PIXEL_WINDOW {
				filter_get_feature_scales(pixel, pixel_buffer, features, feature_means, pass_stride);
				math_vector_max(feature_scale, features, DENOISE_FEATURES);
				} END_FOR_PIXEL_WINDOW

				filter_calculate_scale(feature_scale);



				/* === Generate the feature transformation. ===
				* This transformation maps the DENOISE_FEATURES-dimentional feature space to a reduced feature (r-feature) space
				* which generally has fewer dimensions. This mainly helps to prevent overfitting. */
				float feature_matrix[DENOISE_FEATURES*DENOISE_FEATURES];
				math_trimatrix_zero(feature_matrix, DENOISE_FEATURES);
				FOR_PIXEL_WINDOW {
				filter_get_features(pixel, pixel_buffer, features, feature_means, pass_stride);
				math_vector_mul(features, feature_scale, DENOISE_FEATURES);
				math_trimatrix_add_gramian(feature_matrix, DENOISE_FEATURES, features, 1.0f);
				} END_FOR_PIXEL_WINDOW

				math_trimatrix_jacobi_eigendecomposition(feature_matrix, transform, DENOISE_FEATURES, transform_stride);
				*rank = 0;
				if(relative_pca) {
				float threshold_energy = 0.0f;
				for(int i = 0; i < DENOISE_FEATURES; i++) {
				threshold_energy += feature_matrix[i*DENOISE_FEATURES+i];
				}
				threshold_energy *= 0.999f;

				float reduced_energy = 0.0f;
				for(int i = 0; i < DENOISE_FEATURES; i++, (*rank)++) {
				if(i >= 2 && reduced_energy >= threshold_energy)
				break;
				float s = feature_matrix[i*DENOISE_FEATURES+i];
				reduced_energy += s;
				/* Bake the feature scaling into the transformation matrix. */
				math_vector_mul_strided(transform + iDENOISE_FEATUREStransform_stride, feature_scale, transform_stride, DENOISE_FEATURES);
				}
				}
				else {
				for(int i = 0; i < DENOISE_FEATURES; i++, (*rank)++) {
				float s = feature_matrix[i*DENOISE_FEATURES+i];
				if(i >= 2 && sqrtf(s) < 1.0f)
				break;
				/* Bake the feature scaling into the transformation matrix. */
				math_vector_mul_strided(transform + iDENOISE_FEATUREStransform_stride, feature_scale, transform_stride, DENOISE_FEATURES);
				}
				}
				math_matrix_transpose(transform, DENOISE_FEATURES, transform_stride);
				}

				CCL_NAMESPACE_END