gstreamer/subprojects/gst-plugins-base/ext/gl/effects/gstgleffectxray.c

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/*
* GStreamer
* Copyright (C) 2008 Filippo Argiolas <filippo.argiolas@gmail.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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "../gstgleffects.h"
#include "gstgleffectscurves.h"
#include "gstgleffectlumatocurve.h"
static gboolean kernel_ready = FALSE;
static float gauss_kernel[7];
void
gst_gl_effects_xray (GstGLEffects * effects)
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{
const GstGLFuncs *gl = GST_GL_BASE_FILTER (effects)->context->gl_vtable;
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GstGLFilter *filter = GST_GL_FILTER (effects);
GstGLShader *shader;
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if (!kernel_ready) {
fill_gaussian_kernel (gauss_kernel, 7, 1.5);
kernel_ready = TRUE;
}
/* map luma to xray curve */
gst_gl_effects_luma_to_curve (effects, &xray_curve, GST_GL_EFFECTS_CURVE_XRAY,
effects->intexture, effects->midtexture[0]);
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/* horizontal blur */
shader = gst_gl_effects_get_fragment_shader (effects, "hconv7",
hconv7_fragment_source_gles2);
gst_gl_shader_use (shader);
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gst_gl_shader_set_uniform_1fv (shader, "kernel", 9, gauss_kernel);
gst_gl_shader_set_uniform_1f (shader, "gauss_width",
GST_VIDEO_INFO_WIDTH (&filter->in_info));
gst_gl_filter_render_to_target_with_shader (filter, effects->midtexture[0],
effects->midtexture[1], shader);
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/* vertical blur */
shader = gst_gl_effects_get_fragment_shader (effects, "vconv7",
vconv7_fragment_source_gles2);
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gst_gl_shader_use (shader);
gst_gl_shader_set_uniform_1fv (shader, "kernel", 9, gauss_kernel);
gst_gl_shader_set_uniform_1f (shader, "gauss_height",
GST_VIDEO_INFO_HEIGHT (&filter->out_info));
gst_gl_filter_render_to_target_with_shader (filter, effects->midtexture[1],
effects->midtexture[2], shader);
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/* detect edges with Sobel */
/* the old version used edges from the blurred texture, this uses
* the ones from original texture, still not sure what I like
* more. This one gives better edges obviously but behaves badly
* with noise */
/* desaturate */
shader = gst_gl_effects_get_fragment_shader (effects, "desaturate",
desaturate_fragment_source_gles2);
gst_gl_filter_render_to_target_with_shader (filter, effects->intexture,
effects->midtexture[3], shader);
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/* horizontal convolution */
shader = gst_gl_effects_get_fragment_shader (effects, "sobel_hconv3",
sep_sobel_hconv3_fragment_source_gles2);
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gst_gl_shader_use (shader);
gst_gl_shader_set_uniform_1f (shader, "width",
GST_VIDEO_INFO_WIDTH (&filter->out_info));
gst_gl_filter_render_to_target_with_shader (filter, effects->midtexture[3],
effects->midtexture[4], shader);
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/* vertical convolution */
shader = gst_gl_effects_get_fragment_shader (effects, "sobel_vconv3",
sep_sobel_vconv3_fragment_source_gles2);
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gst_gl_shader_use (shader);
gst_gl_shader_set_uniform_1f (shader, "height",
GST_VIDEO_INFO_HEIGHT (&filter->out_info));
gst_gl_filter_render_to_target_with_shader (filter, effects->midtexture[4],
effects->midtexture[3], shader);
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/* gradient length */
shader = gst_gl_effects_get_fragment_shader (effects, "sobel_length",
sep_sobel_length_fragment_source_gles2);
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gst_gl_shader_use (shader);
gst_gl_shader_set_uniform_1i (shader, "invert", TRUE);
gst_gl_filter_render_to_target_with_shader (filter, effects->midtexture[3],
effects->midtexture[4], shader);
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/* multiply edges with the blurred image */
shader = gst_gl_effects_get_fragment_shader (effects, "multiply",
multiply_fragment_source_gles2);
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gst_gl_shader_use (shader);
gl->ActiveTexture (GL_TEXTURE2);
gl->BindTexture (GL_TEXTURE_2D,
gst_gl_memory_get_texture_id (effects->midtexture[2]));
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gst_gl_shader_set_uniform_1i (shader, "base", 2);
gl->ActiveTexture (GL_TEXTURE1);
gl->BindTexture (GL_TEXTURE_2D,
gst_gl_memory_get_texture_id (effects->midtexture[4]));
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gst_gl_shader_set_uniform_1f (shader, "alpha", (gfloat) 0.5f);
gst_gl_shader_set_uniform_1i (shader, "blend", 1);
gst_gl_filter_render_to_target_with_shader (filter, effects->midtexture[4],
effects->outtexture, shader);
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}