/*

 * 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-glcolorscale

 * @title: glcolorscale

 *

 * video frame scaling and colorspace conversion.

 *

 * ## Scaling and Color space conversion

 *

 * Equivalent to glupload ! gldownload.

 *

 * ## Examples

 * |[

 * gst-launch-1.0 -v videotestsrc ! video/x-raw ! glcolorscale ! ximagesink

 * ]| A pipeline to test colorspace conversion.

 * FBO is required.

  |[

 * gst-launch-1.0 -v videotestsrc ! video/x-raw, width=640, height=480, format=AYUV ! glcolorscale ! \

 *   video/x-raw, width=320, height=240, format=YV12 ! videoconvert ! autovideosink

 * ]| A pipeline to test hardware scaling and colorspace conversion.

 * FBO and GLSL are required.

 *

 */

#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

#include "gstglcolorscale.h"

#define GST_CAT_DEFAULT gst_gl_colorscale_debug

GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);

/* Properties */

enum

{

  PROP_0

};

#define DEBUG_INIT \

  GST_DEBUG_CATEGORY_INIT (gst_gl_colorscale_debug, "glcolorscale", 0, "glcolorscale element");

#define gst_gl_colorscale_parent_class parent_class

G_DEFINE_TYPE_WITH_CODE (GstGLColorscale, gst_gl_colorscale,

    GST_TYPE_GL_FILTER, DEBUG_INIT);

static void gst_gl_colorscale_set_property (GObject * object, guint prop_id,

    const GValue * value, GParamSpec * pspec);

static void gst_gl_colorscale_get_property (GObject * object, guint prop_id,

    GValue * value, GParamSpec * pspec);

static gboolean gst_gl_colorscale_gl_start (GstGLBaseFilter * base_filter);

static void gst_gl_colorscale_gl_stop (GstGLBaseFilter * base_filter);

static gboolean gst_gl_colorscale_filter_texture (GstGLFilter * filter,

    GstGLMemory * in_tex, GstGLMemory * out_tex);

static void

gst_gl_colorscale_class_init (GstGLColorscaleClass * klass)

{

  GObjectClass *gobject_class;

  GstElementClass *element_class;

  GstBaseTransformClass *basetransform_class;

  GstGLBaseFilterClass *base_filter_class;

  GstGLFilterClass *filter_class;

  gobject_class = (GObjectClass *) klass;

  element_class = GST_ELEMENT_CLASS (klass);

  basetransform_class = GST_BASE_TRANSFORM_CLASS (klass);

  base_filter_class = GST_GL_BASE_FILTER_CLASS (klass);

  filter_class = GST_GL_FILTER_CLASS (klass);

  gst_gl_filter_add_rgba_pad_templates (GST_GL_FILTER_CLASS (klass));

  gobject_class->set_property = gst_gl_colorscale_set_property;

  gobject_class->get_property = gst_gl_colorscale_get_property;

  gst_element_class_set_metadata (element_class, "OpenGL color scale",

      "Filter/Effect/Video", "Colorspace converter and video scaler",

      "Julien Isorce <julien.isorce@gmail.com>\n"

      "Matthew Waters <matthew@centricular.com>");

  basetransform_class->passthrough_on_same_caps = TRUE;

  base_filter_class->gl_start = GST_DEBUG_FUNCPTR (gst_gl_colorscale_gl_start);

  base_filter_class->gl_stop = GST_DEBUG_FUNCPTR (gst_gl_colorscale_gl_stop);

  base_filter_class->supported_gl_api =

      GST_GL_API_OPENGL | GST_GL_API_OPENGL3 | GST_GL_API_GLES2;

  filter_class->filter_texture = gst_gl_colorscale_filter_texture;

}

static void

gst_gl_colorscale_init (GstGLColorscale * colorscale)

{

}

static void

gst_gl_colorscale_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_colorscale_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_colorscale_gl_start (GstGLBaseFilter * base_filter)

{

  GstGLColorscale *colorscale = GST_GL_COLORSCALE (base_filter);

  GstGLFilter *filter = GST_GL_FILTER (base_filter);

  GstGLShader *shader;

  GError *error = NULL;

  if (!(shader = gst_gl_shader_new_default (base_filter->context, &error))) {

    GST_ERROR_OBJECT (colorscale, "Failed to initialize shader: %s",

        error->message);

    gst_object_unref (shader);

    return FALSE;

  }

  filter->draw_attr_position_loc =

      gst_gl_shader_get_attribute_location (shader, "a_position");

  filter->draw_attr_texture_loc =

      gst_gl_shader_get_attribute_location (shader, "a_texcoord");

  colorscale->shader = shader;

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

}

static void

gst_gl_colorscale_gl_stop (GstGLBaseFilter * base_filter)

{

  GstGLColorscale *colorscale = GST_GL_COLORSCALE (base_filter);

  if (colorscale->shader) {

    gst_object_unref (colorscale->shader);

    colorscale->shader = NULL;

  }

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

}

static gboolean

gst_gl_colorscale_filter_texture (GstGLFilter * filter, GstGLMemory * in_tex,

    GstGLMemory * out_tex)

{

  GstGLColorscale *colorscale = GST_GL_COLORSCALE (filter);

  if (gst_gl_context_get_gl_api (GST_GL_BASE_FILTER (filter)->context))

    gst_gl_filter_render_to_target_with_shader (filter, in_tex, out_tex,

        colorscale->shader);

  return TRUE;

}