gstreamer/gst/gl/effects/gstgleffectstretch.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
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include <gstgleffects.h>
static void
gst_gl_effects_stretch_callback (gint width, gint height, guint texture,
gpointer data)
{
GstGLShader *shader;
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GstGLEffects *effects = GST_GL_EFFECTS (data);
GstGLDisplay *display = GST_GL_FILTER (effects)->display;
GstGLFuncs *gl = display->gl_vtable;
shader = g_hash_table_lookup (effects->shaderstable, "stretch0");
if (!shader) {
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shader = gst_gl_shader_new (display);
g_hash_table_insert (effects->shaderstable, "stretch0", shader);
}
if (!gst_gl_shader_compile_and_check (shader,
stretch_fragment_source, GST_GL_SHADER_FRAGMENT_SOURCE)) {
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gst_gl_display_set_error (display, "Failed to initialize stretch shader");
GST_ELEMENT_ERROR (effects, RESOURCE, NOT_FOUND,
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GST_GL_DISPLAY_ERR_MSG (display), (NULL));
return;
}
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gl->MatrixMode (GL_PROJECTION);
gl->LoadIdentity ();
gst_gl_shader_use (shader);
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gl->ActiveTexture (GL_TEXTURE0);
gl->Enable (GL_TEXTURE_RECTANGLE_ARB);
gl->BindTexture (GL_TEXTURE_RECTANGLE_ARB, texture);
gst_gl_shader_set_uniform_1i (shader, "tex", 0);
gst_gl_shader_set_uniform_1f (shader, "width", (gfloat) width / 2.0f);
gst_gl_shader_set_uniform_1f (shader, "height", (gfloat) height / 2.0f);
gst_gl_effects_draw_texture (effects, texture, width, height);
}
void
gst_gl_effects_stretch (GstGLEffects * effects)
{
GstGLFilter *filter = GST_GL_FILTER (effects);
gst_gl_filter_render_to_target (filter, TRUE, effects->intexture,
effects->outtexture, gst_gl_effects_stretch_callback, effects);
}