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https://git.ffmpeg.org/ffmpeg.git
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cebe0b577e
Adds a vulkan implementation of the reference prores kostya encoder. Provides about 3-4x speedup over the CPU code
88 lines
3.0 KiB
GLSL
88 lines
3.0 KiB
GLSL
/*
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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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#version 460
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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_shader_explicit_arithmetic_types : require
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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 (constant_id = 0) const int alpha_bits = 0;
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layout (constant_id = 1) const int slices_per_row = 0;
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layout (constant_id = 2) const int width_in_mb = 0;
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layout (constant_id = 3) const int max_mbs_per_slice = 0;
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struct SliceData {
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uint mbs_per_slice;
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int16_t coeffs[4][8 * 256];
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};
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layout (set = 0, binding = 0, scalar) writeonly buffer SliceBuffer {
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SliceData slices[];
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};
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layout (set = 0, binding = 1) uniform readonly iimage2D plane;
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/* Table of possible edge slice configurations */
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const uvec3 edge_mps_table[8] = uvec3[](
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uvec3(0, 0, 0),
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uvec3(1, 0, 0),
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uvec3(2, 0, 0),
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uvec3(2, 1, 0),
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uvec3(4, 0, 0),
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uvec3(4, 1, 0),
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uvec3(4, 2, 0),
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uvec3(4, 2, 1)
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);
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void main()
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{
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ivec2 coord = min(ivec2(gl_GlobalInvocationID.xy), imageSize(plane) - ivec2(1));
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uint16_t alpha = uint16_t(imageLoad(plane, coord).x);
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if (alpha_bits == 8)
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alpha >>= 2;
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else
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alpha = (alpha << 6) | (alpha >> 4);
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uint mbs_per_slice = max_mbs_per_slice;
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uint slices_width = width_in_mb / mbs_per_slice;
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uint mb_width = slices_width * mbs_per_slice;
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uint slice_x = gl_WorkGroupID.x / mbs_per_slice;
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uint slice_y = gl_WorkGroupID.y;
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uvec2 slice_base = uvec2(slice_x * mbs_per_slice * 16u, slice_y * 16u);
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/* Handle slice macroblock size reduction on edge slices */
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if (gl_WorkGroupID.x >= mb_width) {
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uint edge_mb = gl_WorkGroupID.x - mb_width;
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uvec3 table = edge_mps_table[width_in_mb - mb_width];
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uvec3 base = uvec3(0, table.x, table.x + table.y);
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uint edge_slice = edge_mb < base.y ? 0 : (edge_mb < base.z ? 1 : 2);
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slice_x += edge_slice;
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slice_base.x += base[edge_slice] * 16u;
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mbs_per_slice = table[edge_slice];
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}
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uint slice = slice_y * slices_per_row + slice_x;
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uvec2 coeff_coord = uvec2(coord) - slice_base;
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uint coeff = coeff_coord.y * (mbs_per_slice * 16u) + coeff_coord.x;
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slices[slice].coeffs[3][coeff] = int16_t(alpha);
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}
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