diff options
Diffstat (limited to 'intern/cycles/kernel/filter/filter_nlm_gpu.h')
| -rw-r--r-- | intern/cycles/kernel/filter/filter_nlm_gpu.h | 144 |
1 files changed, 144 insertions, 0 deletions
diff --git a/intern/cycles/kernel/filter/filter_nlm_gpu.h b/intern/cycles/kernel/filter/filter_nlm_gpu.h new file mode 100644 index 00000000000..2c5ac807051 --- /dev/null +++ b/intern/cycles/kernel/filter/filter_nlm_gpu.h @@ -0,0 +1,144 @@ +/* + * 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_inline void kernel_filter_nlm_calc_difference(int x, int y, + int dx, int dy, + const ccl_global float *ccl_restrict weight_image, + const ccl_global float *ccl_restrict variance_image, + ccl_global float *difference_image, + int4 rect, int w, + int channel_offset, + float a, float k_2) +{ + float diff = 0.0f; + int numChannels = channel_offset? 3 : 1; + for(int c = 0; c < numChannels; c++) { + float cdiff = weight_image[c*channel_offset + y*w+x] - weight_image[c*channel_offset + (y+dy)*w+(x+dx)]; + float pvar = variance_image[c*channel_offset + y*w+x]; + float qvar = variance_image[c*channel_offset + (y+dy)*w+(x+dx)]; + diff += (cdiff*cdiff - a*(pvar + min(pvar, qvar))) / (1e-8f + k_2*(pvar+qvar)); + } + if(numChannels > 1) { + diff *= 1.0f/numChannels; + } + difference_image[y*w+x] = diff; +} + +ccl_device_inline void kernel_filter_nlm_blur(int x, int y, + const ccl_global float *ccl_restrict difference_image, + ccl_global float *out_image, + int4 rect, int w, int f) +{ + float sum = 0.0f; + const int low = max(rect.y, y-f); + const int high = min(rect.w, y+f+1); + for(int y1 = low; y1 < high; y1++) { + sum += difference_image[y1*w+x]; + } + sum *= 1.0f/(high-low); + out_image[y*w+x] = sum; +} + +ccl_device_inline void kernel_filter_nlm_calc_weight(int x, int y, + const ccl_global float *ccl_restrict difference_image, + ccl_global float *out_image, + int4 rect, int w, int f) +{ + float sum = 0.0f; + const int low = max(rect.x, x-f); + const int high = min(rect.z, x+f+1); + for(int x1 = low; x1 < high; x1++) { + sum += difference_image[y*w+x1]; + } + sum *= 1.0f/(high-low); + out_image[y*w+x] = fast_expf(-max(sum, 0.0f)); +} + +ccl_device_inline void kernel_filter_nlm_update_output(int x, int y, + int dx, int dy, + const ccl_global float *ccl_restrict difference_image, + const ccl_global float *ccl_restrict image, + ccl_global float *out_image, + ccl_global float *accum_image, + int4 rect, int w, int f) +{ + float sum = 0.0f; + const int low = max(rect.x, x-f); + const int high = min(rect.z, x+f+1); + for(int x1 = low; x1 < high; x1++) { + sum += difference_image[y*w+x1]; + } + sum *= 1.0f/(high-low); + if(out_image) { + accum_image[y*w+x] += sum; + out_image[y*w+x] += sum*image[(y+dy)*w+(x+dx)]; + } + else { + accum_image[y*w+x] = sum; + } +} + +ccl_device_inline void kernel_filter_nlm_construct_gramian(int fx, int fy, + int dx, int dy, + const ccl_global float *ccl_restrict difference_image, + const ccl_global float *ccl_restrict buffer, + const ccl_global float *ccl_restrict transform, + ccl_global int *rank, + ccl_global float *XtWX, + ccl_global float3 *XtWY, + int4 rect, + int4 filter_rect, + int w, int h, int f, + int pass_stride, + int localIdx) +{ + int y = fy + filter_rect.y; + int x = fx + filter_rect.x; + const int low = max(rect.x, x-f); + const int high = min(rect.z, x+f+1); + float sum = 0.0f; + for(int x1 = low; x1 < high; x1++) { + sum += difference_image[y*w+x1]; + } + float weight = sum * (1.0f/(high - low)); + + int storage_ofs = fy*filter_rect.z + fx; + transform += storage_ofs; + rank += storage_ofs; + XtWX += storage_ofs; + XtWY += storage_ofs; + + kernel_filter_construct_gramian(x, y, + filter_rect.z*filter_rect.w, + dx, dy, w, h, + pass_stride, + buffer, + transform, rank, + weight, XtWX, XtWY, + localIdx); +} + +ccl_device_inline void kernel_filter_nlm_normalize(int x, int y, + ccl_global float *out_image, + const ccl_global float *ccl_restrict accum_image, + int4 rect, int w) +{ + out_image[y*w+x] /= accum_image[y*w+x]; +} + +CCL_NAMESPACE_END |