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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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49df4dca3c
Reimplement sobel in a multipass fully separated convolution: - calculate x gradient map convolving first horizontally with blurring kernel and then vertically with differentiating kernel - calculate y gradient map convolving first vertically with blurring kernel and then horizonally with differentiating kernel - calculate length of the gradient vector Particular care was needed with normalization of the blurring kernel and with grey level offset of the differentiating one to prevent overflow of rgb values from the [0.0,1.0] range in intermediate passes. Now works on i915.
568 lines
18 KiB
C
568 lines
18 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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#include <gstgleffects.h>
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#include <gstgleffectssources.h>
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#include <math.h>
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/* A common file for sources is needed since shader sources can be
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* generic and reused by several effects */
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/* FIXME */
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/* Move sooner or later into single .frag .vert files and either bake
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* them into a c file at compile time or load them at run time */
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/* fill a normalized and zero centered gaussian vector for separable
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* gaussian convolution */
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void
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fill_gaussian_kernel (float *kernel, int size, float sigma)
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{
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int i;
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float sum;
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int l;
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/* need an odd sized vector to center it at zero */
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g_return_if_fail ((size % 2) != 0);
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sum = 0.0;
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l = (size - 1) / 2;
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for (i = 0; i < size; i++) {
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kernel[i] = expf (-pow ((i - l), 2.0) / (2 * sigma));
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sum += kernel[i];
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}
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for (i = 0; i < size; i++) {
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kernel[i] /= sum;
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}
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}
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/* *INDENT-OFF* */
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/* Vertex shader */
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const gchar *vertex_shader_source =
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"attribute vec4 a_position;"
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"attribute vec2 a_texCoord;"
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"varying vec2 v_texCoord;"
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"void main()"
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"{"
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" gl_Position = a_position;"
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" v_texCoord = a_texCoord;"
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"}";
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/* Identity effect */
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const gchar *identity_fragment_source =
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"precision mediump float;"
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"varying vec2 v_texCoord;"
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"uniform sampler2D tex;"
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"void main()"
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"{"
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" gl_FragColor = texture2D(tex, v_texCoord);"
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"}";
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/* Mirror effect */
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const gchar *mirror_fragment_source =
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#ifndef OPENGL_ES2
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"#extension GL_ARB_texture_rectangle : enable\n"
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"uniform sampler2DRect tex;"
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"uniform float width, height;"
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#else
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"precision mediump float;"
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"varying vec2 v_texCoord;"
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"uniform sampler2D tex;"
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#endif
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"void main () {"
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#ifndef OPENGL_ES2
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" vec2 tex_size = vec2 (width, height);"
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" vec2 texturecoord = gl_TexCoord[0].xy;"
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" vec2 normcoord;"
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" normcoord = texturecoord / tex_size - 1.0;"
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" normcoord.x *= sign (normcoord.x);"
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" texturecoord = (normcoord + 1.0) * tex_size;"
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" vec4 color = texture2DRect (tex, texturecoord);"
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" gl_FragColor = color * gl_Color;"
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#else
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" vec2 texturecoord = v_texCoord.xy;"
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" float normcoord = texturecoord.x - 0.5;"
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" normcoord *= sign (normcoord);"
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" texturecoord.x = (normcoord + 0.5);"
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" gl_FragColor = texture2D (tex, texturecoord);"
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#endif
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"}";
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/* Squeeze effect */
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const gchar *squeeze_fragment_source =
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#ifndef OPENGL_ES2
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"#extension GL_ARB_texture_rectangle : enable\n"
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"uniform sampler2DRect tex;"
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"uniform float width, height;"
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#else
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"precision mediump float;"
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"varying vec2 v_texCoord;"
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"uniform sampler2D tex;"
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#endif
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"void main () {"
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#ifndef OPENGL_ES2
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" vec2 tex_size = vec2 (width, height);"
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" vec2 texturecoord = gl_TexCoord[0].xy;"
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" vec2 normcoord;"
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" normcoord = texturecoord / tex_size - 1.0; "
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" float r = length (normcoord);"
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" r = pow(r, 0.40)*1.3;"
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" normcoord = normcoord / r;"
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" texturecoord = (normcoord + 1.0) * tex_size;"
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" vec4 color = texture2DRect (tex, texturecoord); "
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" gl_FragColor = color * gl_Color;"
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#else
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" vec2 texturecoord = v_texCoord.xy;"
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" vec2 normcoord = texturecoord - 0.5;"
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" float r = length (normcoord);"
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" r = pow(r, 0.40)*1.3;"
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" normcoord = normcoord / r;"
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" texturecoord = (normcoord + 0.5);"
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" gl_FragColor = texture2D (tex, texturecoord);"
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#endif
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"}";
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/* Stretch Effect */
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const gchar *stretch_fragment_source =
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"#extension GL_ARB_texture_rectangle : enable\n"
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"uniform sampler2DRect tex;"
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"uniform float width, height;"
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"void main () {"
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" vec2 tex_size = vec2 (width, height);"
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" vec2 texturecoord = gl_TexCoord[0].xy;"
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" vec2 normcoord;"
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" normcoord = texturecoord / tex_size - 1.0;"
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" float r = length (normcoord);"
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" normcoord *= 2.0 - smoothstep(0.0, 0.7, r);"
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" texturecoord = (normcoord + 1.0) * tex_size;"
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" vec4 color = texture2DRect (tex, texturecoord);"
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" gl_FragColor = color * gl_Color;"
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"}";
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/* Light Tunnel effect */
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const gchar *tunnel_fragment_source =
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"#extension GL_ARB_texture_rectangle : enable\n"
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"uniform sampler2DRect tex;"
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"uniform float width, height;"
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"void main () {"
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" vec2 tex_size = vec2 (width, height);"
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" vec2 texturecoord = gl_TexCoord[0].xy;"
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" vec2 normcoord;"
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/* little trick with normalized coords to obtain a circle with
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* rect textures */
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" normcoord = (texturecoord - tex_size) / tex_size.x;"
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" float r = length(normcoord);"
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" normcoord *= clamp (r, 0.0, 0.5) / r;"
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" texturecoord = (normcoord * tex_size.x) + tex_size;"
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" vec4 color = texture2DRect (tex, texturecoord); "
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" gl_FragColor = color;"
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"}";
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/* FishEye effect */
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const gchar *fisheye_fragment_source =
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"#extension GL_ARB_texture_rectangle : enable\n"
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"uniform sampler2DRect tex;"
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"uniform float width, height;"
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"void main () {"
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" vec2 tex_size = vec2 (width, height);"
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" vec2 texturecoord = gl_TexCoord[0].xy;"
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" vec2 normcoord;"
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" normcoord = texturecoord / tex_size - 1.0;"
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" float r = length (normcoord);"
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" normcoord *= r/sqrt(2.0);"
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" texturecoord = (normcoord + 1.0) * tex_size;"
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" vec4 color = texture2DRect (tex, texturecoord);"
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" gl_FragColor = color;"
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"}";
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/* Twirl effect */
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const gchar *twirl_fragment_source =
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"#extension GL_ARB_texture_rectangle : enable\n"
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"uniform sampler2DRect tex;"
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"uniform float width, height;"
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"void main () {"
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" vec2 tex_size = vec2 (width, height);"
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" vec2 texturecoord = gl_TexCoord[0].xy;"
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" vec2 normcoord;"
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" normcoord = texturecoord / tex_size - 1.0;"
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" float r = length (normcoord);"
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/* calculate rotation angle: maximum (about pi/2) at the origin and
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* gradually decrease it up to 0.6 of each quadrant */
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" float phi = (1.0 - smoothstep (0.0, 0.6, r)) * 1.6;"
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/* precalculate sin phi and cos phi, save some alu */
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" float s = sin(phi);"
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" float c = cos(phi);"
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/* rotate */
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" normcoord *= mat2(c, s, -s, c);"
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" texturecoord = (normcoord + 1.0) * tex_size;"
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" vec4 color = texture2DRect (tex, texturecoord); "
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" gl_FragColor = color;"
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"}";
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/* Bulge effect */
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const gchar *bulge_fragment_source =
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"#extension GL_ARB_texture_rectangle : enable\n"
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"uniform sampler2DRect tex;"
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"uniform float width, height;"
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"void main () {"
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" vec2 tex_size = vec2 (width, height);"
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" vec2 texturecoord = gl_TexCoord[0].xy;"
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" vec2 normcoord;"
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" normcoord = texturecoord / tex_size - 1.0;"
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" float r = length (normcoord);"
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" normcoord *= smoothstep (-0.1, 0.5, r);"
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" texturecoord = (normcoord + 1.0) * tex_size;"
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" vec4 color = texture2DRect (tex, texturecoord);"
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" gl_FragColor = color;"
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"}";
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/* Square Effect */
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const gchar *square_fragment_source =
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"#extension GL_ARB_texture_rectangle : enable\n"
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"uniform sampler2DRect tex;"
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"uniform float width;"
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"uniform float height;"
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"void main () {"
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" vec2 tex_size = vec2 (width, height);"
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" vec2 texturecoord = gl_TexCoord[0].xy;"
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" vec2 normcoord;"
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" normcoord = texturecoord / tex_size - 1.0;"
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" float r = length (normcoord);"
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" normcoord *= 1.0 + smoothstep(0.25, 0.5, abs(normcoord));"
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" normcoord /= 2.0; /* zoom amount */"
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" texturecoord = (normcoord + 1.0) * tex_size;"
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" vec4 color = texture2DRect (tex, texturecoord);"
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" gl_FragColor = color * gl_Color;"
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"}";
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const gchar *luma_threshold_fragment_source =
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"#extension GL_ARB_texture_rectangle : enable\n"
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"uniform sampler2DRect tex;"
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"void main () {"
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" vec2 texturecoord = gl_TexCoord[0].st;"
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" int i;"
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" vec4 color = texture2DRect(tex, texturecoord);"
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" float luma = dot(color.rgb, vec3(0.2125, 0.7154, 0.0721));" /* BT.709 (from orange book) */
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" gl_FragColor = vec4 (vec3 (smoothstep (0.30, 0.50, luma)), color.a);"
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"}";
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const gchar *sobel_fragment_source =
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"#extension GL_ARB_texture_rectangle : enable\n"
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"uniform sampler2DRect tex;"
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"uniform float hkern[9];"
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"uniform float vkern[9];"
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"uniform bool invert;"
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"void main () {"
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" vec2 offset[9];"
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" offset[0] = vec2(-1.0,-1.0);"
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" offset[1] = vec2( 0.0,-1.0);"
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" offset[2] = vec2( 1.0,-1.0);"
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" offset[3] = vec2(-1.0, 0.0);"
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" offset[4] = vec2( 0.0, 0.0);"
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" offset[5] = vec2( 1.0, 0.0);"
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" offset[6] = vec2(-1.0, 1.0);"
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" offset[7] = vec2( 0.0, 1.0);"
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" offset[8] = vec2( 1.0, 1.0);"
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" vec2 texturecoord = gl_TexCoord[0].st;"
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" int i;"
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" float luma;"
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" float gx = 0.0;"
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" float gy = 0.0 ;"
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" for (i = 0; i < 9; i++) { "
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" if(hkern[i] != 0.0 || vkern[i] != 0.0) {"
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" vec4 neighbor = texture2DRect(tex, texturecoord + vec2(offset[i])); "
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" luma = dot(neighbor, vec4(0.2125, 0.7154, 0.0721, neighbor.a));"
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" gx += luma * hkern[i]; "
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" gy += luma * vkern[i]; "
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" }"
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" }"
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" float g = sqrt(gx*gx + gy*gy);"
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" if (invert) g = 1.0 - g;"
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" gl_FragColor = vec4(vec3(g), 1.0);"
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"}";
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const gchar *sobel_gradient_length_fragment_source =
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"#extension GL_ARB_texture_rectangle : enable\n"
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"uniform sampler2DRect gx;"
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"uniform sampler2DRect gy;"
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"void main () {"
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" vec4 dx = texture2DRect (gx, gl_TexCoord[0].st);"
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" vec4 dy = texture2DRect (gy, gl_TexCoord[0].st);"
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" dx = (dx - 0.5);"
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" dy = (dy - 0.5);"
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" gl_FragColor = vec4(sqrt(dx*dx + dy*dy));"
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"}";
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/* horizontal convolution 3x3 */
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const gchar *hconv3_fragment_source =
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"#extension GL_ARB_texture_rectangle : enable\n"
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"uniform sampler2DRect tex;"
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"uniform float kernel[3];"
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"uniform float offset;"
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"void main () {"
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" vec2 texturecoord[3];"
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" float s = gl_TexCoord[0].s;"
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" float t = gl_TexCoord[0].t;"
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" texturecoord[0] = vec2(s-1.0, t);"
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" texturecoord[1] = vec2(s, t);"
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" texturecoord[2] = vec2(s+1.0, t);"
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" int i;"
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" vec4 sum = vec4 (0.0);"
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" for (i = 0; i < 3; i++) { "
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" vec4 neighbor = texture2DRect(tex, texturecoord[i]); "
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" sum += neighbor * kernel[i];"
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" }"
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" gl_FragColor = sum + offset;"
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"}";
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/* vertical convolution 3x3 */
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const gchar *vconv3_fragment_source =
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"#extension GL_ARB_texture_rectangle : enable\n"
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"uniform sampler2DRect tex;"
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"uniform float kernel[3];"
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"uniform float offset;"
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"void main () {"
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" vec2 texturecoord[3];"
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" float s = gl_TexCoord[0].s;"
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" float t = gl_TexCoord[0].t;"
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" texturecoord[0] = vec2(s, t-1.0);"
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" texturecoord[1] = vec2(s, t);"
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" texturecoord[2] = vec2(s, t+1.0);"
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" int i;"
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" vec4 sum = vec4 (0.0);"
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" for (i = 0; i < 3; i++) { "
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" vec4 neighbor = texture2DRect(tex, texturecoord[i]);"
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" sum += neighbor * kernel[i]; "
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" }"
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" gl_FragColor = sum + offset;"
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"}";
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/* horizontal convolution 9x9 */
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const gchar *hconv9_fragment_source =
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"#extension GL_ARB_texture_rectangle : enable\n"
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"uniform sampler2DRect tex;"
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"uniform float kernel[9];"
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"void main () {"
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" vec2 texturecoord[9];"
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" float s = gl_TexCoord[0].s;"
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" float t = gl_TexCoord[0].t;"
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" texturecoord[0] = vec2(s-4.0, t);"
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" texturecoord[1] = vec2(s-3.0, t);"
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" texturecoord[2] = vec2(s-2.0, t);"
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" texturecoord[3] = vec2(s-1.0, t);"
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" texturecoord[4] = vec2(s, t);"
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" texturecoord[5] = vec2(s+1.0, t);"
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" texturecoord[6] = vec2(s+2.0, t);"
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" texturecoord[7] = vec2(s+3.0, t);"
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" texturecoord[8] = vec2(s+4.0, t);"
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" int i;"
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" vec4 sum = vec4 (0.0);"
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" for (i = 0; i < 9; i++) { "
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" vec4 neighbor = texture2DRect(tex, texturecoord[i]); "
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" sum += neighbor * kernel[i];"
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" }"
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" gl_FragColor = sum;"
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"}";
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/* vertical convolution 9x9 */
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const gchar *vconv9_fragment_source =
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"#extension GL_ARB_texture_rectangle : enable\n"
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"uniform sampler2DRect tex;"
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"uniform float kernel[9];"
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"void main () {"
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" vec2 texturecoord[9];"
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" float s = gl_TexCoord[0].s;"
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" float t = gl_TexCoord[0].t;"
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" texturecoord[0] = vec2(s, t-4.0);"
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" texturecoord[1] = vec2(s, t-3.0);"
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" texturecoord[2] = vec2(s, t-2.0);"
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" texturecoord[3] = vec2(s, t-1.0);"
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" texturecoord[4] = vec2(s, t);"
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" texturecoord[5] = vec2(s, t+1.0);"
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" texturecoord[6] = vec2(s, t+2.0);"
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" texturecoord[7] = vec2(s, t+3.0);"
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" texturecoord[8] = vec2(s, t+4.0);"
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" int i;"
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" vec4 sum = vec4 (0.0);"
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" for (i = 0; i < 9; i++) { "
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" vec4 neighbor = texture2DRect(tex, texturecoord[i]);"
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" sum += neighbor * kernel[i]; "
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" }"
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" gl_FragColor = sum;"
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"}";
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/* TODO: support several blend modes */
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const gchar *sum_fragment_source =
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"#extension GL_ARB_texture_rectangle : enable\n"
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"uniform sampler2DRect base;"
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"uniform sampler2DRect blend;"
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"uniform float alpha;"
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"uniform float beta;"
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"void main () {"
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" vec4 basecolor = texture2DRect (base, gl_TexCoord[0].st);"
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" vec4 blendcolor = texture2DRect (blend, gl_TexCoord[0].st);"
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" gl_FragColor = alpha * basecolor + beta * blendcolor;"
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"}";
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const gchar *multiply_fragment_source =
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"#extension GL_ARB_texture_rectangle : enable\n"
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"uniform sampler2DRect base;"
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"uniform sampler2DRect blend;"
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"uniform float alpha;"
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"void main () {"
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" vec4 basecolor = texture2DRect (base, gl_TexCoord[0].st);"
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" vec4 blendcolor = texture2DRect (blend, gl_TexCoord[0].st);"
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" gl_FragColor = (1.0 - alpha) * basecolor + alpha * basecolor * blendcolor;"
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"}";
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/* lut operations, map luma to tex1d, see orange book (chapter 19) */
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const gchar *luma_to_curve_fragment_source =
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"#extension GL_ARB_texture_rectangle : enable\n"
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"uniform sampler2DRect tex;"
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"uniform sampler1D curve;"
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"void main () {"
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" vec2 texturecoord = gl_TexCoord[0].st;"
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" vec4 color = texture2DRect (tex, texturecoord);"
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" float luma = dot(color.rgb, vec3(0.2125, 0.7154, 0.0721));"
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" color = texture1D(curve, luma);"
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" gl_FragColor = color;"
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"}";
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|
|
|
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/* lut operations, map rgb to tex1d, see orange book (chapter 19) */
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const gchar *rgb_to_curve_fragment_source =
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"#extension GL_ARB_texture_rectangle : enable\n"
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"uniform sampler2DRect tex;"
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"uniform sampler1D curve;"
|
|
"void main () {"
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" vec4 color = texture2DRect (tex, gl_TexCoord[0].st);"
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" vec4 outcolor;"
|
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" outcolor.r = texture1D(curve, color.r).r;"
|
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" outcolor.g = texture1D(curve, color.g).g;"
|
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" outcolor.b = texture1D(curve, color.b).b;"
|
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" outcolor.a = color.a;"
|
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" gl_FragColor = outcolor;"
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"}";
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|
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const gchar *sin_fragment_source =
|
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"#extension GL_ARB_texture_rectangle : enable\n"
|
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"uniform sampler2DRect tex;"
|
|
"vec3 rgb2hsl (vec3 v)"
|
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"{"
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/* TODO: check this algorythm */
|
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" float MIN, MAX;"
|
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" float r, g, b;"
|
|
" float h, l, s;"
|
|
" float delta;"
|
|
" h = 0.0; l = 0.0; s = 0.0;"
|
|
" r = v.r; g = v.g; b = v.b;"
|
|
" MIN = min (r, min (g, b));"
|
|
" MAX = max (r, max (g, b));"
|
|
" delta = MAX - MIN;"
|
|
" l = (MAX + MIN) / 2.0;"
|
|
" if ((MAX - MIN) < 0.0001) { h = 0.0; s = 0.0; }"
|
|
" else {"
|
|
" if (l <= 0.5) s = (MAX - MIN) / (MAX + MIN);"
|
|
" else s = (MAX - MIN) / (2.0 - MAX - MIN);"
|
|
" if (r == MAX) h = (g - b) / delta;"
|
|
" else if (g == MAX) h = 2.0 + (b - r) / delta;"
|
|
" else h = 4.0 + (r - g) / delta;"
|
|
" h *= 60.0;"
|
|
" if (h < 0.0) h += 360.0;"
|
|
" }"
|
|
" return vec3 (h, l, s);"
|
|
"}"
|
|
"void main () {"
|
|
" vec3 HSL, RGB;"
|
|
" vec4 color = texture2DRect (tex, vec2(gl_TexCoord[0].st));"
|
|
" float luma = dot(color.rgb, vec3(0.2125, 0.7154, 0.0721));"
|
|
" HSL = rgb2hsl (color.rgb);"
|
|
/* move hls discontinuity away from the desired red zone so we can use
|
|
* smoothstep.. to try: convert degrees in radiants, divide by 2 and
|
|
* smoothstep cosine */
|
|
" HSL.x += 180.0;"
|
|
" if ((HSL.x) > 360.0) HSL.x -= 360.0;"
|
|
/* damn, it is extremely hard to get rid of human face reds! */
|
|
/* picked hue is slightly shifted towards violet to prevent this but
|
|
* still fails.. maybe hsl is not well suited for this */
|
|
" float a = smoothstep (110.0, 150.0, HSL.x);"
|
|
" float b = smoothstep (170.0, 210.0, HSL.x);"
|
|
" float alpha = a - b;"
|
|
" gl_FragColor = color * alpha + luma * (1.0 - alpha);"
|
|
"}";
|
|
|
|
const gchar *interpolate_fragment_source =
|
|
"#extension GL_ARB_texture_rectangle : enable\n"
|
|
"uniform sampler2DRect base;"
|
|
"uniform sampler2DRect blend;"
|
|
"void main () {"
|
|
"vec4 basecolor = texture2DRect (base, gl_TexCoord[0].st);"
|
|
"vec4 blendcolor = texture2DRect (blend, gl_TexCoord[0].st);"
|
|
"vec4 white = vec4(1.0);"
|
|
"gl_FragColor = blendcolor + (1.0 - blendcolor.a) * basecolor;"
|
|
"}";
|
|
|
|
const gchar *texture_interp_fragment_source =
|
|
"#extension GL_ARB_texture_rectangle : enable\n"
|
|
"uniform sampler2DRect base;"
|
|
"uniform sampler2DRect blend;"
|
|
"uniform sampler2DRect alpha;"
|
|
"uniform float final_width, final_height;"
|
|
"uniform float base_width, base_height;"
|
|
/*
|
|
"uniform float blend_width, blend_height;"
|
|
"uniform float alpha_width, alpha_height;"
|
|
*/
|
|
"void main () {"
|
|
"vec2 base_scale = vec2 (base_width, base_height) / vec2 (final_width, final_height);"
|
|
/*
|
|
"vec2 blend_scale = vec2 (blend_width, blend_height) / vec2 (final_width, final_height);"
|
|
"vec2 alpha_scale = vec2 (alpha_width, alpha_height) / vec2 (final_width, final_height);"
|
|
*/
|
|
|
|
"vec4 basecolor = texture2DRect (base, gl_TexCoord[0].st * base_scale);"
|
|
"vec4 blendcolor = texture2DRect (blend, gl_TexCoord[0].st);"
|
|
"vec4 alphacolor = texture2DRect (alpha, gl_TexCoord[0].st);"
|
|
// "gl_FragColor = alphacolor;"
|
|
"gl_FragColor = (alphacolor * blendcolor) + (1.0 - alphacolor) * basecolor;"
|
|
"}";
|
|
|
|
const gchar *difference_fragment_source =
|
|
"#extension GL_ARB_texture_rectangle : enable\n"
|
|
"uniform sampler2DRect saved;"
|
|
"uniform sampler2DRect current;"
|
|
"void main () {"
|
|
"vec4 savedcolor = texture2DRect (saved, gl_TexCoord[0].st);"
|
|
"vec4 currentcolor = texture2DRect (current, gl_TexCoord[0].st);"
|
|
"gl_FragColor = vec4 (step (0.12, length (savedcolor - currentcolor)));"
|
|
"}";
|
|
|
|
/* *INDENT-ON* */
|