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40 lines
1.3 KiB
GLSL
40 lines
1.3 KiB
GLSL
/* GStreamer
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* Copyright (C) 2020 Matthew Waters <matthew@centricular.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library 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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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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struct ColorMatrices
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{
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mat4 to_RGB_matrix;
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mat4 primaries_matrix;
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mat4 to_YUV_matrix;
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};
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vec3 color_matrix_convert (in vec3 texel, in mat4 color_matrix)
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{
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vec4 rgb_ = color_matrix * vec4(texel, 1.0);
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return rgb_.rgb;
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}
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vec3 color_convert_texel (in vec3 texel, in ColorMatrices m)
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{
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/* FIXME: need to add gamma remapping between these stages */
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vec3 tmp = color_matrix_convert (texel, m.to_RGB_matrix);
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tmp = color_matrix_convert (tmp, m.primaries_matrix);
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return color_matrix_convert (tmp, m.to_YUV_matrix);
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}
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