--- /dev/null
+/*
+ * 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., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include <gstgleffects.h>
+
+static void
+gst_gl_effects_squeeze_callback (gint width, gint height, guint texture, gpointer data)
+{
+ GstGLEffects* effects = GST_GL_EFFECTS (data);
+
+ GstGLShader *shader;
+ gfloat tex_size[2];
+
+ shader = g_hash_table_lookup (effects->shaderstable, "squeeze0");
+
+ if (!shader) {
+ shader = gst_gl_shader_new ();
+ g_hash_table_insert (effects->shaderstable, "squeeze0", shader);
+ }
+
+ g_return_if_fail (
+ gst_gl_shader_compile_and_check (shader, squeeze_fragment_source,
+ GST_GL_SHADER_FRAGMENT_SOURCE));
+
+ glMatrixMode (GL_PROJECTION);
+ glLoadIdentity ();
+
+ gst_gl_shader_use (shader);
+
+ glActiveTexture (GL_TEXTURE0);
+ glEnable (GL_TEXTURE_RECTANGLE_ARB);
+ glBindTexture (GL_TEXTURE_RECTANGLE_ARB, texture);
+
+ gst_gl_shader_set_uniform_1i (shader, "tex", 0);
+
+ tex_size[0] = GST_GL_FILTER(effects)->width / 2.0;
+ tex_size[1] = GST_GL_FILTER(effects)->height / 2.0;
+
+ gst_gl_shader_set_uniform_1f (shader, "width", tex_size[0]);
+ gst_gl_shader_set_uniform_1f (shader, "height", tex_size[1]);
+
+ gst_gl_effects_draw_texture (effects, texture);
+}
+
+void
+gst_gl_effects_squeeze (GstGLEffects *effects) {
+ GstGLFilter *filter = GST_GL_FILTER (effects);
+
+ gst_gl_filter_render_to_target (filter, effects->intexture, effects->outtexture,
+ gst_gl_effects_squeeze_callback, effects);
+}
/* A common file for sources is needed since shader sources can be
* generic and reused by several effects */
-/* Mirror */
+
+/* Mirror effect */
const gchar *mirror_fragment_source =
"#extension GL_ARB_texture_rectangle : enable\n"
"uniform sampler2DRect tex;"
" vec4 color = texture2DRect (tex, texturecoord); "
" gl_FragColor = color * gl_Color;"
"}";
+
+
+/* Squeeze effect */
+const gchar *squeeze_fragment_source =
+"#extension GL_ARB_texture_rectangle : enable\n"
+"uniform sampler2DRect tex;"
+"uniform float width, height;"
+"void main () {"
+" vec2 tex_size = vec2 (width, height);"
+" vec2 texturecoord = gl_TexCoord[0].xy;"
+" vec2 normcoord;"
+" normcoord = texturecoord / tex_size - 1.0; "
+" float r = length (normcoord);"
+" r = pow(r, 0.40)*1.3;"
+" normcoord = normcoord / r;"
+" texturecoord = (normcoord + 1.0) * tex_size;"
+" vec4 color = texture2DRect (tex, texturecoord); "
+" gl_FragColor = color * gl_Color;"
+"}";
+
typedef enum {
GST_GL_EFFECT_IDENTITY,
GST_GL_EFFECT_MIRROR,
+ GST_GL_EFFECT_SQUEEZE,
GST_GL_N_EFFECTS
} GstGLEffectsEffect;
static const GEnumValue effect_types [] = {
{ GST_GL_EFFECT_IDENTITY, "Do nothing Effect", "identity" },
{ GST_GL_EFFECT_MIRROR, "Mirror Effect", "mirror" },
+ { GST_GL_EFFECT_SQUEEZE, "Squeeze Effect", "squeeze" },
{ 0, NULL, NULL }
};
case GST_GL_EFFECT_MIRROR:
effects->effect = (GstGLEffectProcessFunc) gst_gl_effects_mirror;
break;
+ case GST_GL_EFFECT_SQUEEZE:
+ effects->effect = (GstGLEffectProcessFunc) gst_gl_effects_squeeze;
+ break;
default:
g_assert_not_reached ();
}