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gstreamer/gst/gl/gstglpixbufoverlay.c

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/*
* 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gstglfilter.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#define GST_TYPE_GL_PIXBUFOVERLAY (gst_gl_pixbufoverlay_get_type())
#define GST_GL_PIXBUFOVERLAY(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj), GST_TYPE_GL_PIXBUFOVERLAY,GstGLPixbufOverlay))
#define GST_IS_GL_PIXBUFOVERLAY(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj), GST_TYPE_GL_PIXBUFOVERLAY))
#define GST_GL_PIXBUFOVERLAY_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass) , GST_TYPE_GL_PIXBUFOVERLAY,GstGLPixbufOverlayClass))
#define GST_IS_GL_PIXBUFOVERLAY_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass) , GST_TYPE_GL_PIXBUFOVERLAY))
#define GST_GL_PIXBUFOVERLAY_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS((obj) , GST_TYPE_GL_PIXBUFOVERLAY,GstGLPixbufOverlayClass))
struct _GstGLPixbufOverlay
{
GstGLFilter filter;
GstGLShader *shader;
gchar *location;
gboolean pbuf_has_changed;
GdkPixbuf *pixbuf;
GLuint pbuftexture;
};
struct _GstGLPixbufOverlayClass
{
GstGLFilterClass filter_class;
};
typedef struct _GstGLPixbufOverlay GstGLPixbufOverlay;
typedef struct _GstGLPixbufOverlayClass GstGLPixbufOverlayClass;
#define GST_CAT_DEFAULT gst_gl_pixbufoverlay_debug
GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
#define DEBUG_INIT(bla) \
GST_DEBUG_CATEGORY_INIT (gst_gl_pixbufoverlay_debug, "glpixbufoverlay", 0, "glpixbufoverlay element");
GST_BOILERPLATE_FULL (GstGLPixbufOverlay, gst_gl_pixbufoverlay, GstGLFilter,
GST_TYPE_GL_FILTER, DEBUG_INIT);
static void gst_gl_pixbufoverlay_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_gl_pixbufoverlay_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void gst_gl_pixbufoverlay_init_resources (GstGLFilter* filter);
static void gst_gl_pixbufoverlay_reset_resources (GstGLFilter* filter);
static gboolean gst_gl_pixbufoverlay_filter (GstGLFilter * filter,
GstGLBuffer * inbuf, GstGLBuffer * outbuf);
static const GstElementDetails element_details = GST_ELEMENT_DETAILS (
"Gstreamer OpenGL PixbufOverlay",
"Filter/Effect",
"Overlay GL video texture with a gdkpixbuf",
"Filippo Argiolas <filippo.argiolas@gmail.com>");
static const gchar *interpolate_fragment_source =
"#extension GL_ARB_texture_rectangle : enable\n"
"uniform sampler2DRect base;"
"uniform sampler2DRect blend;"
"void main () {"
"vec4 basecolor = texture2DRect (base, gl_TexCoord[0].st);"
"vec4 blendcolor = texture2DRect (blend, gl_TexCoord[0].st);"
"vec4 white = vec4(1.0);"
"gl_FragColor = blendcolor + (1 - blendcolor.a) * basecolor;"
"}";
enum
{
PROP_0,
PROP_LOCATION,
/* future properties? */
/* PROP_STRETCH, */
/* PROP_WIDTH, */
/* PROP_HEIGHT, */
/* PROP_XPOS, */
/* PROP_YPOS */
};
/* init resources that need a gl context */
static void
gst_gl_pixbufoverlay_init_gl_resources (GstGLFilter *filter)
{
GstGLPixbufOverlay *pixbufoverlay = GST_GL_PIXBUFOVERLAY (filter);
pixbufoverlay->shader = gst_gl_shader_new ();
g_return_if_fail (
gst_gl_shader_compile_and_check (pixbufoverlay->shader, interpolate_fragment_source,
GST_GL_SHADER_FRAGMENT_SOURCE));
}
/* free resources that need a gl context */
static void
gst_gl_pixbufoverlay_reset_gl_resources (GstGLFilter *filter)
{
GstGLPixbufOverlay *pixbufoverlay = GST_GL_PIXBUFOVERLAY (filter);
glDeleteTextures (1, &pixbufoverlay->pbuftexture);
g_object_unref (pixbufoverlay->shader);
}
static void
gst_gl_pixbufoverlay_base_init (gpointer klass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
gst_element_class_set_details (element_class, &element_details);
}
static void
gst_gl_pixbufoverlay_class_init (GstGLPixbufOverlayClass * klass)
{
GObjectClass *gobject_class;
gobject_class = (GObjectClass *) klass;
gobject_class->set_property = gst_gl_pixbufoverlay_set_property;
gobject_class->get_property = gst_gl_pixbufoverlay_get_property;
GST_GL_FILTER_CLASS (klass)->filter = gst_gl_pixbufoverlay_filter;
GST_GL_FILTER_CLASS (klass)->display_init_cb = gst_gl_pixbufoverlay_init_gl_resources;
GST_GL_FILTER_CLASS (klass)->display_reset_cb = gst_gl_pixbufoverlay_reset_gl_resources;
GST_GL_FILTER_CLASS (klass)->onStart = gst_gl_pixbufoverlay_init_resources;
GST_GL_FILTER_CLASS (klass)->onStop = gst_gl_pixbufoverlay_reset_resources;
g_object_class_install_property (gobject_class,
PROP_LOCATION,
g_param_spec_string ("location",
"Location of the image",
"Location of the image",
NULL, G_PARAM_READWRITE));
}
void
gst_gl_pixbufoverlay_draw_texture (GstGLPixbufOverlay * pixbufoverlay, GLuint tex)
{
GstGLFilter *filter = GST_GL_FILTER (pixbufoverlay);
glActiveTexture (GL_TEXTURE0);
glEnable (GL_TEXTURE_RECTANGLE_ARB);
glBindTexture (GL_TEXTURE_RECTANGLE_ARB, tex);
glBegin (GL_QUADS);
glTexCoord2f (0.0, 0.0);
glVertex2f (-1.0, -1.0);
glTexCoord2f ((gfloat)filter->width, 0.0);
glVertex2f (1.0, -1.0);
glTexCoord2f ((gfloat)filter->width, (gfloat)filter->height);
glVertex2f (1.0, 1.0);
glTexCoord2f (0.0, (gfloat)filter->height);
glVertex2f (-1.0, 1.0);
glEnd ();
}
static void
gst_gl_pixbufoverlay_init (GstGLPixbufOverlay * pixbufoverlay,
GstGLPixbufOverlayClass * klass)
{
pixbufoverlay->shader = NULL;
pixbufoverlay->location = NULL;
pixbufoverlay->pixbuf = NULL;
pixbufoverlay->pbuftexture = 0;
pixbufoverlay->pbuf_has_changed = FALSE;
}
static void
gst_gl_pixbufoverlay_reset_resources (GstGLFilter* filter)
{
// GstGLPixbufOverlay* pixbufoverlay = GST_GL_PIXBUFOVERLAY(filter);
}
static void
gst_gl_pixbufoverlay_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstGLPixbufOverlay *pixbufoverlay = GST_GL_PIXBUFOVERLAY (object);
switch (prop_id) {
case PROP_LOCATION:
if (pixbufoverlay->location != NULL) g_free (pixbufoverlay->location);
g_message ("\nHEERE\n");
pixbufoverlay->pbuf_has_changed = TRUE;
pixbufoverlay->location = g_value_dup_string (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_gl_pixbufoverlay_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstGLPixbufOverlay *pixbufoverlay = GST_GL_PIXBUFOVERLAY (object);
switch (prop_id) {
case PROP_LOCATION:
g_value_set_string (value, pixbufoverlay->location);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_gl_pixbufoverlay_init_resources (GstGLFilter* filter)
{
// GstGLPixbufOverlay *pixbufoverlay = GST_GL_PIXBUFOVERLAY (filter);
}
static void
gst_gl_pixbufoverlay_callback (gint width, gint height, guint texture, gpointer stuff)
{
GstGLPixbufOverlay* pixbufoverlay = GST_GL_PIXBUFOVERLAY (stuff);
glMatrixMode (GL_PROJECTION);
glLoadIdentity ();
gst_gl_shader_use (pixbufoverlay->shader);
glActiveTexture (GL_TEXTURE0);
glEnable (GL_TEXTURE_RECTANGLE_ARB);
glBindTexture (GL_TEXTURE_RECTANGLE_ARB, texture);
glDisable(GL_TEXTURE_RECTANGLE_ARB);
gst_gl_shader_set_uniform_1i (pixbufoverlay->shader, "base", 0);
glActiveTexture (GL_TEXTURE3);
glEnable (GL_TEXTURE_RECTANGLE_ARB);
glBindTexture (GL_TEXTURE_RECTANGLE_ARB, pixbufoverlay->pbuftexture);
glDisable (GL_TEXTURE_RECTANGLE_ARB);
gst_gl_shader_set_uniform_1i (pixbufoverlay->shader, "blend", 3);
gst_gl_pixbufoverlay_draw_texture (pixbufoverlay, texture);
}
static void init_pixbuf_texture (GstGLDisplay *display, gpointer data)
{
GstGLPixbufOverlay *pixbufoverlay = GST_GL_PIXBUFOVERLAY (data);
GstGLFilter *filter = GST_GL_FILTER (data);
glDeleteTextures (1, &pixbufoverlay->pbuftexture);
glGenTextures (1, &pixbufoverlay->pbuftexture);
glBindTexture (GL_TEXTURE_RECTANGLE_ARB, pixbufoverlay->pbuftexture);
glTexImage2D (GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGBA,
filter->width, filter->height, 0,
gdk_pixbuf_get_has_alpha (pixbufoverlay->pixbuf) ? GL_RGBA : GL_RGB,
GL_UNSIGNED_BYTE, gdk_pixbuf_get_pixels (pixbufoverlay->pixbuf));
}
static gboolean
gst_gl_pixbufoverlay_filter (GstGLFilter* filter, GstGLBuffer* inbuf,
GstGLBuffer* outbuf)
{
GstGLPixbufOverlay* pixbufoverlay = GST_GL_PIXBUFOVERLAY(filter);
GdkPixbuf *pixbuf;
GError *error = NULL;
if (pixbufoverlay->pbuf_has_changed && (pixbufoverlay->location != NULL)) {
g_message ("RECEIVED: %s", pixbufoverlay->location);
pixbuf = gdk_pixbuf_new_from_file (pixbufoverlay->location, &error);
if (pixbuf) {
pixbufoverlay->pixbuf = gdk_pixbuf_scale_simple (pixbuf,
filter->width,
filter->height,
GDK_INTERP_BILINEAR);
gdk_pixbuf_unref (pixbuf);
if (pixbufoverlay->pixbuf != NULL) {
gst_gl_display_thread_add (filter->display, init_pixbuf_texture, pixbufoverlay);
gdk_pixbuf_unref (pixbufoverlay->pixbuf);
}
} else {
if (error != NULL && error->message != NULL)
g_warning ("unable to load %s: %s", pixbufoverlay->location, error->message);
}
pixbufoverlay->pbuf_has_changed = FALSE;
}
gst_gl_filter_render_to_target (filter, inbuf->texture, outbuf->texture,
gst_gl_pixbufoverlay_callback, pixbufoverlay);
return TRUE;
}
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