/* 

 * GStreamer

 * Copyright (C) 2008 Julien Isorce <julien.isorce@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., 51 Franklin St, Fifth Floor,

 * Boston, MA 02110-1301, USA.

 */

/**

 * SECTION:element-glfilterapp

 * @title: glfilterapp

 *

 * The resize and redraw callbacks can be set from a client code.

 *

 * ## CLient callbacks

 *

 * The graphic scene can be written from a client code through the

 * two glfilterapp properties.

 *

 * ## Examples

 * see gst-plugins-gl/tests/examples/generic/recordgraphic

 *

 */

#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

#include "gstglfilterapp.h"

#define GST_CAT_DEFAULT gst_gl_filter_app_debug

GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);

enum

{

  SIGNAL_0,

  CLIENT_DRAW_SIGNAL,

  LAST_SIGNAL

};

static guint gst_gl_filter_app_signals[LAST_SIGNAL] = { 0 };

#define DEBUG_INIT \

  GST_DEBUG_CATEGORY_INIT (gst_gl_filter_app_debug, "glfilterapp", 0, "glfilterapp element");

#define gst_gl_filter_app_parent_class parent_class

G_DEFINE_TYPE_WITH_CODE (GstGLFilterApp, gst_gl_filter_app,

    GST_TYPE_GL_FILTER, DEBUG_INIT);

static void gst_gl_filter_app_set_property (GObject * object, guint prop_id,

    const GValue * value, GParamSpec * pspec);

static void gst_gl_filter_app_get_property (GObject * object, guint prop_id,

    GValue * value, GParamSpec * pspec);

static gboolean gst_gl_filter_app_set_caps (GstGLFilter * filter,

    GstCaps * incaps, GstCaps * outcaps);

static gboolean gst_gl_filter_app_filter_texture (GstGLFilter * filter,

    GstGLMemory * in_tex, GstGLMemory * out_tex);

static gboolean gst_gl_filter_app_gl_start (GstGLBaseFilter * base_filter);

static void gst_gl_filter_app_gl_stop (GstGLBaseFilter * base_filter);

static void

gst_gl_filter_app_class_init (GstGLFilterAppClass * klass)

{

  GObjectClass *gobject_class;

  GstElementClass *element_class;

  gobject_class = (GObjectClass *) klass;

  element_class = GST_ELEMENT_CLASS (klass);

  gst_gl_filter_add_rgba_pad_templates (GST_GL_FILTER_CLASS (klass));

  gobject_class->set_property = gst_gl_filter_app_set_property;

  gobject_class->get_property = gst_gl_filter_app_get_property;

  GST_GL_BASE_FILTER_CLASS (klass)->gl_start = gst_gl_filter_app_gl_start;

  GST_GL_BASE_FILTER_CLASS (klass)->gl_stop = gst_gl_filter_app_gl_stop;

  GST_GL_FILTER_CLASS (klass)->set_caps = gst_gl_filter_app_set_caps;

  GST_GL_FILTER_CLASS (klass)->filter_texture =

      gst_gl_filter_app_filter_texture;

  /**

   * GstGLFilterApp::client-draw:

   * @object: the #GstGLImageSink

   * @texture: the #guint id of the texture.

   * @width: the #guint width of the texture.

   * @height: the #guint height of the texture.

   *

   * Will be emitted before to draw the texture.  The client should

   * redraw the surface/contents with the @texture, @width and @height.

   *

   * Returns: whether the texture was redrawn by the signal.  If not, a

   *          default redraw will occur.

   */

  gst_gl_filter_app_signals[CLIENT_DRAW_SIGNAL] =

      g_signal_new ("client-draw", G_TYPE_FROM_CLASS (klass),

      G_SIGNAL_RUN_LAST, 0, NULL, NULL, g_cclosure_marshal_generic,

      G_TYPE_BOOLEAN, 3, G_TYPE_UINT, G_TYPE_UINT, G_TYPE_UINT);

  gst_element_class_set_metadata (element_class,

      "OpenGL application filter", "Filter/Effect",

      "Use client callbacks to define the scene",

      "Julien Isorce <julien.isorce@gmail.com>");

  GST_GL_BASE_FILTER_CLASS (klass)->supported_gl_api =

      GST_GL_API_OPENGL | GST_GL_API_GLES2 | GST_GL_API_OPENGL3;

}

static void

gst_gl_filter_app_init (GstGLFilterApp * filter)

{

}

static void

gst_gl_filter_app_set_property (GObject * object, guint prop_id,

    const GValue * value, GParamSpec * pspec)

{

  switch (prop_id) {

    default:

      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);

      break;

  }

}

static void

gst_gl_filter_app_get_property (GObject * object, guint prop_id,

    GValue * value, GParamSpec * pspec)

{

  switch (prop_id) {

    default:

      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);

      break;

  }

}

static gboolean

gst_gl_filter_app_gl_start (GstGLBaseFilter * base_filter)

{

  GstGLFilter *filter = GST_GL_FILTER (base_filter);

  GError *error = NULL;

  if (!(filter->default_shader =

          gst_gl_shader_new_default (base_filter->context, &error))) {

    GST_ELEMENT_ERROR (filter, RESOURCE, NOT_FOUND, ("%s",

            "Failed to create the default shader"), ("%s", error->message));

    return FALSE;

  }

  return GST_GL_BASE_FILTER_CLASS (parent_class)->gl_start (base_filter);

}

static void

gst_gl_filter_app_gl_stop (GstGLBaseFilter * base_filter)

{

  GstGLFilter *filter = GST_GL_FILTER (base_filter);

  if (filter->default_shader)

    gst_object_unref (filter->default_shader);

  filter->default_shader = NULL;

  GST_GL_BASE_FILTER_CLASS (parent_class)->gl_stop (base_filter);

}

static gboolean

gst_gl_filter_app_set_caps (GstGLFilter * filter, GstCaps * incaps,

    GstCaps * outcaps)

{

  //GstGLFilterApp* app_filter = GST_GL_FILTER_APP(filter);

  return TRUE;

}

struct glcb2

{

  GstGLFilterApp *app;

  GstGLMemory *in_tex;

  GstGLMemory *out_tex;

};

static gboolean

_emit_draw_signal (gpointer data)

{

  struct glcb2 *cb = data;

  gboolean drawn;

  g_signal_emit (cb->app, gst_gl_filter_app_signals[CLIENT_DRAW_SIGNAL], 0,

      cb->in_tex->tex_id, gst_gl_memory_get_texture_width (cb->out_tex),

      gst_gl_memory_get_texture_height (cb->out_tex), &drawn);

  return !drawn;

}

static gboolean

gst_gl_filter_app_filter_texture (GstGLFilter * filter, GstGLMemory * in_tex,

    GstGLMemory * out_tex)

{

  GstGLFilterApp *app_filter = GST_GL_FILTER_APP (filter);

  gboolean default_draw;

  struct glcb2 cb;

  cb.app = app_filter;

  cb.in_tex = in_tex;

  cb.out_tex = out_tex;

  default_draw =

      gst_gl_framebuffer_draw_to_texture (filter->fbo,

      out_tex, _emit_draw_signal, &cb;;

  if (default_draw) {

    gst_gl_filter_render_to_target_with_shader (filter, in_tex, out_tex,

        filter->default_shader);

  }

  return TRUE;

}