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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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5fd66383ab
Rework Sobel a little bit again making it work as the old one: 1. desaturate input texture 2. calculate horizontal convolution for x gradient and vertical convolution for y gradient at the same time (halves the number of needed texture lookups) 3. store results in a single texture (red and green channel) 4. calculate remaining convolution (same as above switching vertical and horizontal) 5. calculate length of gradient using red and green as x and y components. Optimize wherever possible, store kernels as constants in the shaders, remove unneeded uniforms. Restore invert property carefully avoiding using IF. Still not sure if "full color" convolution will be needed, glfiltersobel is to be intended as a demo filter and xray, the only effect which uses sobel only needs edge intensity. Dropping it for now.
53 lines
2.2 KiB
C
53 lines
2.2 KiB
C
/*
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* GStreamer
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* Copyright (C) 2008 Filippo Argiolas <filippo.argiolas@gmail.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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#ifndef __GST_GL_EFFECTS_SOURCES_H__
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#define __GST_GL_EFFECTS_SOURCES_H__
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extern const gchar *vertex_shader_source;
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extern const gchar *identity_fragment_source;
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extern const gchar *mirror_fragment_source;
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extern const gchar *squeeze_fragment_source;
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extern const gchar *stretch_fragment_source;
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extern const gchar *tunnel_fragment_source;
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extern const gchar *fisheye_fragment_source;
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extern const gchar *twirl_fragment_source;
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extern const gchar *bulge_fragment_source;
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extern const gchar *square_fragment_source;
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extern const gchar *luma_threshold_fragment_source;
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extern const gchar *sobel_fragment_source;
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extern const gchar *sep_sobel_length_fragment_source;
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extern const gchar *desaturate_fragment_source;
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extern const gchar *sep_sobel_hconv3_fragment_source;
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extern const gchar *sep_sobel_vconv3_fragment_source;
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extern const gchar *hconv9_fragment_source;
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extern const gchar *vconv9_fragment_source;
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extern const gchar *sum_fragment_source;
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extern const gchar *luma_to_curve_fragment_source;
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extern const gchar *rgb_to_curve_fragment_source;
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extern const gchar *sin_fragment_source;
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extern const gchar *interpolate_fragment_source;
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extern const gchar *texture_interp_fragment_source;
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extern const gchar *difference_fragment_source;
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extern const gchar *multiply_fragment_source;
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void fill_gaussian_kernel (float *kernel, int size, float sigma);
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#endif /* __GST_GL_EFFECTS_SOURCES_H__ */
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