gstreamer/ext/vulkan/shaders/upsample_yuy2.glsl

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/* GStreamer
* Copyright (C) 2020 Matthew Waters <matthew@centricular.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
vec3 upsample_YUY2(in sampler2D tex, in vec2 texCoord, in vec2 texSize, in ivec4 inReorderIdx)
{
vec2 dx = vec2(-1.0 / texSize.x, 0.0);
if (mod (texCoord.x * texSize.x, 2.0) < 1.0) {
dx[1] = -dx[0];
dx[0] = 0.0;
}
vec3 yuv;
yuv.x = texture(tex, texCoord)[inReorderIdx[0]];
/* FIXME: should get cosited sampling right... */
vec4 texel;
texel.xy = texture(tex, texCoord + vec2(dx[0], 0.0)).rg;
texel.zw = texture(tex, texCoord + vec2(dx[1], 0.0)).rg;
yuv.y = texel[inReorderIdx[1]];
yuv.z = texel[inReorderIdx[3]];
return yuv;
}