gstreamer/ext/gl/effects/gstgleffectrgbtocurve.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"
static void
gst_gl_effects_rgb_to_curve (GstGLEffects * effects,
const GstGLEffectsCurve * curve, gint curve_index, GstGLMemory * in_tex,
GstGLMemory * out_tex)
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{
GstGLContext *context = GST_GL_BASE_FILTER (effects)->context;
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GstGLFilter *filter = GST_GL_FILTER (effects);
const GstGLFuncs *gl = context->gl_vtable;
GstGLShader *shader;
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shader = gst_gl_effects_get_fragment_shader (effects, "rgb_to_curve",
rgb_to_curve_fragment_source_gles2);
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if (!shader)
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return;
#if GST_GL_HAVE_OPENGL
if (USING_OPENGL (context)) {
gl->MatrixMode (GL_PROJECTION);
gl->LoadIdentity ();
}
#endif
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if (effects->curve[curve_index] == 0) {
/* this parameters are needed to have a right, predictable, mapping */
gl->GenTextures (1, &effects->curve[curve_index]);
gl->BindTexture (GL_TEXTURE_2D, effects->curve[curve_index]);
gl->TexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
gl->TexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
gl->TexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
gl->TexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
gl->TexImage2D (GL_TEXTURE_2D, 0, GL_RGB,
curve->width, 1, 0, GL_RGB, GL_UNSIGNED_BYTE, curve->pixel_data);
}
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gst_gl_shader_use (shader);
gl->ActiveTexture (GL_TEXTURE2);
gl->BindTexture (GL_TEXTURE_2D, effects->curve[curve_index]);
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gst_gl_shader_set_uniform_1i (shader, "curve", 2);
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gst_gl_filter_render_to_target_with_shader (filter, in_tex, out_tex, shader);
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}
void
gst_gl_effects_xpro (GstGLEffects * effects)
{
gst_gl_effects_rgb_to_curve (effects, &xpro_curve, GST_GL_EFFECTS_CURVE_XPRO,
effects->intexture, effects->outtexture);
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}