mirror of
https://git.ffmpeg.org/ffmpeg.git
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Lynne
82 lines
2.6 KiB
GLSL
82 lines
2.6 KiB
GLSL
/*
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* Copyright (c) Lynne
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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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layout (constant_id = 0) const uint planes = 0;
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layout (constant_id = 1) const bool has_alpha = false;
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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 image2D main_img[];
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layout (set = 0, binding = 1) uniform readonly image2D overlay_img[];
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layout (set = 0, binding = 2) uniform writeonly image2D output_img[];
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layout (push_constant, scalar) uniform pushConstants {
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ivec2 o_offset[4];
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ivec2 o_size[4];
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};
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void overlay_noalpha(uint i, ivec2 pos)
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{
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if ((o_offset[i].x <= pos.x) && (o_offset[i].y <= pos.y) &&
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(pos.x < (o_offset[i].x + o_size[i].x)) &&
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(pos.y < (o_offset[i].y + o_size[i].y))) {
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vec4 res = imageLoad(overlay_img[i], pos - o_offset[i]);
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imageStore(output_img[i], pos, res);
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} else {
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vec4 res = imageLoad(main_img[i], pos);
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imageStore(output_img[i], pos, res);
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}
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}
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void overlay_alpha_opaque(uint i, ivec2 pos)
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{
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vec4 res = imageLoad(main_img[i], pos);
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if ((o_offset[i].x <= pos.x) && (o_offset[i].y <= pos.y) &&
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(pos.x < (o_offset[i].x + o_size[i].x)) &&
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(pos.y < (o_offset[i].y + o_size[i].y))) {
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vec4 ovr = imageLoad(overlay_img[i], pos - o_offset[i]);
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res = ovr * ovr.a + res * (1.0f - ovr.a);
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res.a = 1.0f;
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imageStore(output_img[i], pos, res);
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}
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imageStore(output_img[i], pos, res);
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}
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void main()
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{
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ivec2 pos = ivec2(gl_GlobalInvocationID.xy);
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for (uint i = 0; i < planes; i++) {
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if (any(greaterThanEqual(pos, imageSize(output_img[i]))))
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return;
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if (has_alpha)
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overlay_alpha_opaque(i, pos);
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else
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overlay_noalpha(i, pos);
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}
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}
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