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,
    PROP_RED,
    PROP_GREEN,
    PROP_BLUE,
    PROP_FOVY,
    PROP_ASPECT,
    PROP_ZNEAR,
    PROP_ZFAR
};

#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_set_caps (GstGLFilter* filter, 
    GstCaps* incaps, GstCaps* outcaps);
static gboolean gst_gl_filter_cube_filter (GstGLFilter* filter,
    GstGLBuffer* inbuf, GstGLBuffer* outbuf);
static void gst_gl_filter_cube_callback (gint width, gint height, guint texture, gpointer stuff);


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)->set_caps = gst_gl_filter_cube_set_caps;
    GST_GL_FILTER_CLASS (klass)->filter = gst_gl_filter_cube_filter;

    g_object_class_install_property (gobject_class, PROP_RED,
        g_param_spec_float ("red", "Red", "Background red color",
            0.0f, 1.0f, 0.0f, G_PARAM_WRITABLE));

    g_object_class_install_property (gobject_class, PROP_GREEN,
        g_param_spec_float ("green", "Green", "Background reen color",
            0.0f, 1.0f, 0.0f, G_PARAM_WRITABLE));

    g_object_class_install_property (gobject_class, PROP_BLUE,
        g_param_spec_float ("blue", "Blue", "Background blue color",
            0.0f, 1.0f, 0.0f, G_PARAM_WRITABLE));

    g_object_class_install_property (gobject_class, PROP_FOVY,
        g_param_spec_double ("fovy", "Fovy", "Field of view angle in degrees",
            0.0, 180.0, 45.0, G_PARAM_WRITABLE));

    g_object_class_install_property (gobject_class, PROP_ASPECT,
        g_param_spec_double ("aspect", "Aspect", "Field of view in the x direction",
            0.0, 100, 0.0, G_PARAM_WRITABLE));

    g_object_class_install_property (gobject_class, PROP_ZNEAR,
        g_param_spec_double ("znear", "Znear", 
            "Specifies the	distance from the viewer to the	near clipping plane",
            0.0, 100.0, 0.1, G_PARAM_WRITABLE));

    g_object_class_install_property (gobject_class, PROP_ZFAR,
        g_param_spec_double ("zfar", "Zfar", 
            "Specifies the	distance from the viewer to the	far clipping plane",
            0.0, 1000.0, 100.0, G_PARAM_WRITABLE));
}

static void
gst_gl_filter_cube_init (GstGLFilterCube* filter,
    GstGLFilterCubeClass* klass)
{
    filter->fovy = 45;
    filter->aspect = 0;
    filter->znear = 0.1;
    filter->zfar = 100;
}

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) 
    {
        case PROP_RED:
            filter->red = g_value_get_float (value);
            break;
        case PROP_GREEN:
            filter->green = g_value_get_float (value);
            break;
        case PROP_BLUE:
            filter->blue = g_value_get_float (value);
            break;
        case PROP_FOVY:
            filter->fovy = g_value_get_double (value);
            break;
        case PROP_ASPECT:
            filter->aspect = g_value_get_double (value);
            break;
        case PROP_ZNEAR:
            filter->znear = g_value_get_double (value);
            break;
        case PROP_ZFAR:
            filter->zfar = g_value_get_double (value);
            break;
        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_set_caps (GstGLFilter* filter, GstCaps* incaps,
    GstCaps* outcaps)
{
    GstGLFilterCube* cube_filter = GST_GL_FILTER_CUBE (filter);

    if (cube_filter->aspect == 0)
        cube_filter->aspect = (gdouble)filter->width / (gdouble)filter->height;

    return TRUE;
}

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, 
        cube_filter->fovy, cube_filter->aspect, cube_filter->znear, cube_filter->zfar,
        GST_GL_DISPLAY_PROJECTION_PERSPECIVE, (gpointer)cube_filter);

    return TRUE;
}

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

    GstGLFilterCube* cube_filter = GST_GL_FILTER_CUBE (stuff);

    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);

    glClearColor(cube_filter->red, cube_filter->green, cube_filter->blue, 0.0);
    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;

    glDisable(GL_DEPTH_TEST);
}