[161/906] import squeeze effect from cvs

gst/gl/Makefile.am

@@ -30,7 +30,8 @@ libgstopengl_la_SOURCES = \
 	effects/gstgleffectssources.c \
 	effects/gstgleffectssources.h \
 	effects/gstgleffectidentity.c \
-	effects/gstgleffectmirror.c
+	effects/gstgleffectmirror.c \
+	effects/gstgleffectsqueeze.c
 	
 
 # check order of CFLAGS and LIBS, shouldn't the order be the other way around

gst/gl/effects/gstgleffects.h

@@ -77,6 +77,7 @@ void gst_gl_effects_draw_texture (GstGLEffects * effects, GLuint tex);
 
 void gst_gl_effects_identity (GstGLEffects *effects);
 void gst_gl_effects_mirror (GstGLEffects *effects);
+void gst_gl_effects_squeeze (GstGLEffects *effects);
 
 G_END_DECLS
 

gst/gl/effects/gstgleffectsqueeze.c

@@ -0,0 +1,68 @@
+/*
+ * 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);
+}

gst/gl/effects/gstgleffectssources.c

@@ -23,7 +23,8 @@
 /* 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;"
@@ -38,3 +39,23 @@ const gchar *mirror_fragment_source =
   "  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;"
+"}";
+

gst/gl/effects/gstgleffectssources.h

@@ -24,5 +24,6 @@
 #define __GST_GL_EFFECTS_SOURCES_H__
 
 const gchar *mirror_fragment_source;
+const gchar *squeeze_fragment_source;
 
 #endif /* __GST_GL_EFFECTS_SOURCES_H__ */

gst/gl/gstgleffects.c

@@ -57,6 +57,7 @@ static const GstElementDetails element_details = GST_ELEMENT_DETAILS (
 typedef enum {
   GST_GL_EFFECT_IDENTITY,
   GST_GL_EFFECT_MIRROR,
+  GST_GL_EFFECT_SQUEEZE,
   GST_GL_N_EFFECTS
 } GstGLEffectsEffect;
 
@@ -68,6 +69,7 @@ gst_gl_effects_effect_get_type (void)
   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 }
   };
 
@@ -214,6 +216,9 @@ gst_gl_effects_set_effect (GstGLEffects *effects, gint effect_type) {
   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 ();
   }