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/*
* FFv1 codec
*
* Copyright (c) 2024 Lynne <dev@lynne.ee>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
ivec4 load_components(ivec2 pos)
{
if (planar_rgb == 0)
return ivec4(imageLoad(src[0], pos));
ivec4 pix;
for (int i = 0; i < (3 + transparency); i++)
pix[i] = int(imageLoad(src[i], pos)[0]);
/* Swizzle out the difference */
if (bits > 8 && bits < 16 && transparency == 0)
return pix.bgra;
return pix.brga;
}
void bypass_sample(ivec2 pos)
{
imageStore(dst[0], pos, load_components(pos));
}
void bypass_block(in SliceContext sc)
{
ivec2 start = ivec2(gl_LocalInvocationID) + sc.slice_pos;
ivec2 end = sc.slice_pos + sc.slice_dim;
for (uint y = start.y; y < end.y; y += gl_WorkGroupSize.y)
for (uint x = start.x; x < end.x; x += gl_WorkGroupSize.x)
bypass_sample(ivec2(x, y));
}
void transform_sample(ivec2 pos, ivec2 rct_coef)
{
ivec4 pix = load_components(pos);
pix.b -= pix.g;
pix.r -= pix.g;
pix.g += (pix.r*rct_coef.x + pix.b*rct_coef.y) >> 2;
pix.b += offset;
pix.r += offset;
imageStore(dst[0], pos, pix);
}
void transform_block(in SliceContext sc)
{
const ivec2 rct_coef = sc.slice_rct_coef;
const ivec2 start = ivec2(gl_LocalInvocationID) + sc.slice_pos;
const ivec2 end = sc.slice_pos + sc.slice_dim;
for (uint y = start.y; y < end.y; y += gl_WorkGroupSize.y)
for (uint x = start.x; x < end.x; x += gl_WorkGroupSize.x)
transform_sample(ivec2(x, y), rct_coef);
}
void main()
{
const uint slice_idx = gl_WorkGroupID.y*gl_NumWorkGroups.x + gl_WorkGroupID.x;
if (slice_ctx[slice_idx].slice_coding_mode == 1)
bypass_block(slice_ctx[slice_idx]);
else
transform_block(slice_ctx[slice_idx]);
}
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