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71 lines
2.3 KiB
C
71 lines
2.3 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., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#include <gstgleffects.h>
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static void
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gst_gl_effects_twirl_callback (gint width, gint height, guint texture,
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gpointer data)
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{
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GstGLEffects *effects = GST_GL_EFFECTS (data);
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GstGLShader *shader;
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shader = g_hash_table_lookup (effects->shaderstable, "twirl0");
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if (!shader) {
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shader = gst_gl_shader_new (GST_GL_FILTER (effects)->display);
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g_hash_table_insert (effects->shaderstable, "twirl0", shader);
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}
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if (!gst_gl_shader_compile_and_check (shader,
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twirl_fragment_source, GST_GL_SHADER_FRAGMENT_SOURCE)) {
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gst_gl_display_set_error (GST_GL_FILTER (effects)->display,
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"Failed to initialize twirl shader");
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GST_ELEMENT_ERROR (effects, RESOURCE, NOT_FOUND,
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GST_GL_DISPLAY_ERR_MSG (GST_GL_FILTER (effects)->display), (NULL));
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return;
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}
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glMatrixMode (GL_PROJECTION);
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glLoadIdentity ();
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gst_gl_shader_use (shader);
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glActiveTexture (GL_TEXTURE0);
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glEnable (GL_TEXTURE_RECTANGLE_ARB);
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glBindTexture (GL_TEXTURE_RECTANGLE_ARB, texture);
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gst_gl_shader_set_uniform_1i (shader, "tex", 0);
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gst_gl_shader_set_uniform_1f (shader, "width", (gfloat) width / 2.0f);
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gst_gl_shader_set_uniform_1f (shader, "height", (gfloat) height / 2.0f);
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gst_gl_effects_draw_texture (effects, texture, width, height);
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}
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void
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gst_gl_effects_twirl (GstGLEffects * effects)
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{
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GstGLFilter *filter = GST_GL_FILTER (effects);
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gst_gl_filter_render_to_target (filter, TRUE, effects->intexture,
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effects->outtexture, gst_gl_effects_twirl_callback, effects);
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}
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