From 7364319bfd40329ecdb01a500d75b7daef8e3794 Mon Sep 17 00:00:00 2001
From: Filippo Argiolas <filippo.argiolas@gmail.com>
Date: Thu, 14 Aug 2008 22:28:19 +0200
Subject: [PATCH] [174/906] add a property to gleffects to switch video left to
 right, useful with webcams to resemble a mirror

---
 gst/gl/gstgleffects.c | 44 +++++++++++++++++++++++++++++++-------------
 gst/gl/gstgleffects.h |  5 ++++-
 2 files changed, 35 insertions(+), 14 deletions(-)

diff --git a/gst/gl/gstgleffects.c b/gst/gl/gstgleffects.c
index 2170aa3..465ef4c 100644
--- a/gst/gl/gstgleffects.c
+++ b/gst/gl/gstgleffects.c
@@ -222,6 +222,14 @@ gst_gl_effects_class_init (GstGLEffectsClass * klass)
 		       GST_TYPE_GL_EFFECTS_EFFECT,
 		       GST_GL_EFFECT_IDENTITY,
 		       G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+  g_object_class_install_property (
+    gobject_class,
+    PROP_HSWAP,
+    g_param_spec_boolean ("hswap",
+                          "Horizontal Swap",
+                          "Switch video texture left to right, useful with webcams",
+                          FALSE,
+                          G_PARAM_READWRITE));
 }
 
 void
@@ -247,21 +255,21 @@ gst_gl_effects_draw_texture (GstGLEffects * effects, GLuint tex)
   glEnd ();
 }
 
-/* static void */
-/* set_orizonthal_switch (GstGLDisplay *display, gpointer data) */
-/* { */
-/* //  GstGLEffects *effects = GST_GL_EFFECTS (data); */
+static void
+set_horizontal_swap (GstGLDisplay *display, gpointer data)
+{
+//  GstGLEffects *effects = GST_GL_EFFECTS (data);
 
-/*   const double mirrormatrix[16] = { */
-/*     -1.0, 0.0, 0.0, 0.0, */
-/*     0.0, 1.0, 0.0, 0.0, */
-/*     0.0, 0.0, 1.0, 0.0, */
-/*     0.0, 0.0, 0.0, 1.0 */
-/*   }; */
+  const double mirrormatrix[16] = {
+    -1.0, 0.0, 0.0, 0.0,
+    0.0, 1.0, 0.0, 0.0,
+    0.0, 0.0, 1.0, 0.0,
+    0.0, 0.0, 0.0, 1.0
+  };
 
-/*   glMatrixMode (GL_MODELVIEW); */
-/*   glLoadMatrixd (mirrormatrix); */
-/* } */
+  glMatrixMode (GL_MODELVIEW);
+  glLoadMatrixd (mirrormatrix);
+}
 
 static void
 gst_gl_effects_init (GstGLEffects * effects, GstGLEffectsClass * klass)
@@ -276,6 +284,7 @@ gst_gl_effects_init (GstGLEffects * effects, GstGLEffectsClass * klass)
   }
 
   effects->effect = gst_gl_effects_identity;
+  effects->horizontal_swap = FALSE;
 }
 
 static void
@@ -297,6 +306,9 @@ gst_gl_effects_set_property (GObject * object, guint prop_id,
   case PROP_EFFECT:
     gst_gl_effects_set_effect (effects, g_value_get_enum (value));
     break;
+  case PROP_HSWAP:
+    effects->horizontal_swap = g_value_get_boolean (value);
+    break;
   default:
     G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
     break;
@@ -313,6 +325,9 @@ gst_gl_effects_get_property (GObject * object, guint prop_id,
   case PROP_EFFECT:
     g_value_set_enum (value, effects->current_effect);
     break;
+  case PROP_HSWAP:
+    g_value_set_boolean (value, effects->horizontal_swap);
+    break;
   default:
     G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
     break;
@@ -334,6 +349,9 @@ gst_gl_effects_filter (GstGLFilter* filter, GstGLBuffer* inbuf,
   effects->intexture = inbuf->texture;
   effects->outtexture = outbuf->texture;
 
+  if (effects->horizontal_swap == TRUE)
+    gst_gl_display_thread_add (filter->display, set_horizontal_swap, effects);
+
   effects->effect (effects);
 
   return TRUE;
diff --git a/gst/gl/gstgleffects.h b/gst/gl/gstgleffects.h
index 4af9d24..3781ded 100644
--- a/gst/gl/gstgleffects.h
+++ b/gst/gl/gstgleffects.h
@@ -67,6 +67,8 @@ struct _GstGLEffects
   GLuint curve[GST_GL_EFFECTS_N_CURVES];
 
   GHashTable *shaderstable;
+
+  gboolean horizontal_swap; /* switch left to right */
 };
 
 struct _GstGLEffectsClass
@@ -77,7 +79,8 @@ struct _GstGLEffectsClass
 enum
 {
   PROP_0,
-  PROP_EFFECT
+  PROP_EFFECT,
+  PROP_HSWAP
 };
 
 
-- 
2.7.4