mirror of
https://git.ffmpeg.org/ffmpeg.git
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Lynne
63 lines
2.1 KiB
GLSL
63 lines
2.1 KiB
GLSL
/*
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* Copyright 2025 (c) Niklas Haas
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#pragma shader_stage(compute)
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#extension GL_EXT_shader_image_load_formatted : require
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#extension GL_EXT_scalar_block_layout : require
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#extension GL_EXT_nonuniform_qualifier : require
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#extension GL_KHR_shader_subgroup_arithmetic : require
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#extension GL_EXT_null_initializer : require
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layout (constant_id = 0) const uint planes = 0;
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layout (constant_id = 1) const uint slices = 0;
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layout (local_size_x_id = 253, local_size_y_id = 254, local_size_z_id = 255) in;
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layout (set = 0, binding = 0) uniform readonly uimage2D prev_img[];
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layout (set = 0, binding = 1) uniform readonly uimage2D cur_img[];
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layout (set = 0, binding = 2, scalar) buffer sad_buffer {
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uint frame_sad[];
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};
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shared uint wg_sum = { };
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void main()
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{
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const uint slice = gl_WorkGroupID.x % slices;
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const ivec2 pos = ivec2(gl_GlobalInvocationID.xy);
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for (uint i = 0; i < planes; i++) {
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const ivec2 pos = ivec2(gl_GlobalInvocationID.xy);
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if (all(lessThan(pos, imageSize(cur_img[i])))) {
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uvec4 prev = imageLoad(prev_img[i], pos);
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uvec4 cur = imageLoad(cur_img[i], pos);
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uvec4 sad = abs(ivec4(cur) - ivec4(prev));
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uint sum = subgroupAdd(sad.x + sad.y + sad.z);
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if (subgroupElect())
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atomicAdd(wg_sum, sum);
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}
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}
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barrier();
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if (gl_LocalInvocationIndex == 0)
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atomicAdd(frame_sad[slice], wg_sum);
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}
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