gstreamer/gst/gl/gstglfiltercube.c

/* 
 * 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., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "gstglfiltercube.h"

#define GST_CAT_DEFAULT gst_gl_filter_cube_debug
GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);

static const GstElementDetails element_details = 
    GST_ELEMENT_DETAILS ("OpenGL cube filter",
        "Filter/Effect",
        "Map input texture on the 6 cube faces",
        "Julien Isorce <julien.isorce@gmail.com>");

enum
{
    PROP_0
};

#define DEBUG_INIT(bla) \
  GST_DEBUG_CATEGORY_INIT (gst_gl_filter_cube_debug, "glfiltercube", 0, "glfiltercube element");

GST_BOILERPLATE_FULL (GstGLFilterCube, gst_gl_filter_cube, GstGLFilter,
    GST_TYPE_GL_FILTER, DEBUG_INIT);

static void gst_gl_filter_cube_set_property (GObject* object, guint prop_id,
    const GValue* value, GParamSpec * pspec);
static void gst_gl_filter_cube_get_property (GObject* object, guint prop_id,
    GValue* value, GParamSpec* pspec);

static gboolean gst_gl_filter_cube_filter (GstGLFilter* filter,
    GstGLBuffer* inbuf, GstGLBuffer* outbuf);
static void gst_gl_filter_cube_callback (guint width, guint height, guint texture, GLhandleARB shader);


static void
gst_gl_filter_cube_base_init (gpointer klass)
{
    GstElementClass *element_class = GST_ELEMENT_CLASS (klass);

    gst_element_class_set_details (element_class, &element_details);
}

static void
gst_gl_filter_cube_class_init (GstGLFilterCubeClass * klass)
{
    GObjectClass* gobject_class;

    gobject_class = (GObjectClass *) klass;
    gobject_class->set_property = gst_gl_filter_cube_set_property;
    gobject_class->get_property = gst_gl_filter_cube_get_property;

    GST_GL_FILTER_CLASS (klass)->filter = gst_gl_filter_cube_filter;
}

static void
gst_gl_filter_cube_init (GstGLFilterCube* filter,
    GstGLFilterCubeClass* klass)
{
}

static void
gst_gl_filter_cube_set_property (GObject* object, guint prop_id,
    const GValue* value, GParamSpec* pspec)
{
    //GstGLFilterCube *filter = GST_GL_FILTER_CUBE (object);

    switch (prop_id) 
    {
        default:
            G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
            break;
    }
}

static void
gst_gl_filter_cube_get_property (GObject* object, guint prop_id,
    GValue* value, GParamSpec* pspec)
{
    //GstGLFilterCube *filter = GST_GL_FILTER_CUBE (object);

    switch (prop_id) 
    {
        default:
            G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
            break;
    }
}

static gboolean
gst_gl_filter_cube_filter (GstGLFilter* filter, GstGLBuffer* inbuf,
    GstGLBuffer* outbuf)
{
    //GstGLFilterCube* cube_filter = GST_GL_FILTER_CUBE(filter);

    //blocking call, use a FBO
    gst_gl_display_use_fbo (filter->display, filter->width, filter->height,
        filter->fbo, filter->depthbuffer, outbuf->texture, gst_gl_filter_cube_callback,
        inbuf->width, inbuf->height, inbuf->texture, 0);

    return TRUE;
}

//opengl scene, params: input texture (not the output filter->texture)
static void
gst_gl_filter_cube_callback (guint width, guint height, guint texture, GLhandleARB shader)
{
    static GLfloat	xrot = 0;
    static GLfloat	yrot = 0;				
    static GLfloat	zrot = 0;

    glEnable(GL_DEPTH_TEST);

    glEnable (GL_TEXTURE_RECTANGLE_ARB);
    glBindTexture (GL_TEXTURE_RECTANGLE_ARB, texture);
    glTexParameteri (GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glTexParameteri (GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    glTexParameteri (GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
    glTexParameteri (GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
    glTexEnvi (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
	
    glTranslatef(0.0f,0.0f,-5.0f);

    glRotatef(xrot,1.0f,0.0f,0.0f);
    glRotatef(yrot,0.0f,1.0f,0.0f);
    glRotatef(zrot,0.0f,0.0f,1.0f);

    glBegin(GL_QUADS);
	      // Front Face
	      glTexCoord2f((gfloat)width, 0.0f); glVertex3f(-1.0f, -1.0f,  1.0f);
	      glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f,  1.0f);
	      glTexCoord2f(0.0f, (gfloat)height); glVertex3f( 1.0f,  1.0f,  1.0f);
	      glTexCoord2f((gfloat)width, (gfloat)height); glVertex3f(-1.0f,  1.0f,  1.0f);
	      // Back Face
	      glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f, -1.0f);
	      glTexCoord2f(0.0f, (gfloat)height); glVertex3f(-1.0f,  1.0f, -1.0f);
	      glTexCoord2f((gfloat)width, (gfloat)height); glVertex3f( 1.0f,  1.0f, -1.0f);
	      glTexCoord2f((gfloat)width, 0.0f); glVertex3f( 1.0f, -1.0f, -1.0f);
	      // Top Face
	      glTexCoord2f((gfloat)width, (gfloat)height); glVertex3f(-1.0f,  1.0f, -1.0f);
	      glTexCoord2f((gfloat)width, 0.0f); glVertex3f(-1.0f,  1.0f,  1.0f);
	      glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f,  1.0f,  1.0f);
	      glTexCoord2f(0.0f, (gfloat)height); glVertex3f( 1.0f,  1.0f, -1.0f);
	      // Bottom Face
	      glTexCoord2f((gfloat)width, 0.0f); glVertex3f(-1.0f, -1.0f, -1.0f);
	      glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f, -1.0f);
	      glTexCoord2f(0.0f, (gfloat)height); glVertex3f( 1.0f, -1.0f,  1.0f);
	      glTexCoord2f((gfloat)width,(gfloat)height); glVertex3f(-1.0f, -1.0f,  1.0f);
	      // Right face
	      glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f, -1.0f);
	      glTexCoord2f(0.0f, (gfloat)height); glVertex3f( 1.0f,  1.0f, -1.0f);
	      glTexCoord2f((gfloat)width, (gfloat)height); glVertex3f( 1.0f,  1.0f,  1.0f);
	      glTexCoord2f((gfloat)width, 0.0f); glVertex3f( 1.0f, -1.0f,  1.0f);
	      // Left Face
	      glTexCoord2f((gfloat)width, 0.0f); glVertex3f(-1.0f, -1.0f, -1.0f);
	      glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f,  1.0f);
	      glTexCoord2f(0.0f, (gfloat)height); glVertex3f(-1.0f,  1.0f,  1.0f);
	      glTexCoord2f((gfloat)width, (gfloat)height); glVertex3f(-1.0f,  1.0f, -1.0f);
    glEnd();

    xrot+=0.3f;
    yrot+=0.2f;
    zrot+=0.4f;
}