/*
 * Copyright (C) 2006 John Ellis
 * Copyright (C) 2008 - 2016 The Geeqie Team
 *
 * Author: John Ellis
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>

#include "main.h"
#include "pixbuf-renderer.h"
#include "renderer-clutter.h"

#include "intl.h"
#include "layout.h"

#include <gtk/gtk.h>

#ifdef HAVE_CLUTTER

/* for 3d texture */
#define COGL_ENABLE_EXPERIMENTAL_API
#define CLUTTER_ENABLE_EXPERIMENTAL_API

#include <clutter/clutter.h>

#include <clutter-gtk/clutter-gtk.h>



#define GQ_BUILD 1

#ifdef GQ_BUILD
#include "main.h"
#include "pixbuf_util.h"
#include "exif.h"
#else
typedef enum {
	EXIF_ORIENTATION_UNKNOWN	= 0,
	EXIF_ORIENTATION_TOP_LEFT	= 1,
	EXIF_ORIENTATION_TOP_RIGHT	= 2,
	EXIF_ORIENTATION_BOTTOM_RIGHT	= 3,
	EXIF_ORIENTATION_BOTTOM_LEFT	= 4,
	EXIF_ORIENTATION_LEFT_TOP	= 5,
	EXIF_ORIENTATION_RIGHT_TOP	= 6,
	EXIF_ORIENTATION_RIGHT_BOTTOM	= 7,
	EXIF_ORIENTATION_LEFT_BOTTOM	= 8
} ExifOrientationType;
#endif

#define GET_RIGHT_PIXBUF_OFFSET(rc) \
        (( (rc->stereo_mode & PR_STEREO_RIGHT) && !(rc->stereo_mode & PR_STEREO_SWAP)) || \
         (!(rc->stereo_mode & PR_STEREO_RIGHT) &&  (rc->stereo_mode & PR_STEREO_SWAP)) ?  \
          rc->pr->stereo_pixbuf_offset_right : rc->pr->stereo_pixbuf_offset_left )

#define GET_LEFT_PIXBUF_OFFSET(rc) \
        ((!(rc->stereo_mode & PR_STEREO_RIGHT) && !(rc->stereo_mode & PR_STEREO_SWAP)) || \
         ( (rc->stereo_mode & PR_STEREO_RIGHT) &&  (rc->stereo_mode & PR_STEREO_SWAP)) ?  \
          rc->pr->stereo_pixbuf_offset_right : rc->pr->stereo_pixbuf_offset_left )


typedef struct _OverlayData OverlayData;
struct _OverlayData
{
	gint id;

	GdkPixbuf *pixbuf;
	ClutterActor *actor;

	gint x;
	gint y;

	OverlayRendererFlags flags;
};

typedef struct _RendererClutter RendererClutter;

struct _RendererClutter
{
	RendererFuncs f;
	PixbufRenderer *pr;


	gint stereo_mode;
	gint stereo_off_x;
	gint stereo_off_y;


	GList *pending_updates;
	gint idle_update;

	GList *overlay_list;

	GtkWidget *widget; /* widget and stage may be shared with other renderers */
	ClutterActor *stage;
	ClutterActor *texture;
	ClutterActor *group;

	gboolean clut_updated;
	gint64 last_pixbuf_change;
};

typedef struct _RendererClutterAreaParam RendererClutterAreaParam;
struct _RendererClutterAreaParam {
	RendererClutter *rc;
	gint x;
	gint y;
	gint w;
	gint h;
};

typedef struct _RendererClutterShaderInfo RendererClutterShaderInfo;
struct _RendererClutterShaderInfo {
	float checkersize;
	float checkercolor0[3];
	float checkercolor1[3];
};

#define CLUT_SIZE	32

static void rc_set_shader(CoglHandle material, const RendererClutterShaderInfo *shaderInfo)
{
	CoglHandle shader;
	CoglHandle program;
	gint uniform_no;

	shader = cogl_create_shader (COGL_SHADER_TYPE_FRAGMENT);
	cogl_shader_source (shader,
	"vec3 checker(vec2 texc, vec3 color0, vec3 color1)						\n"
	"{																		\n"
	"  if (mod(floor(texc.x) + floor(texc.y), 2.0) == 0.0)					\n"
	"    return color0;														\n"
	"  else																	\n"
	"    return color1;														\n"
	"}																		\n"
	"																		\n"
	"uniform sampler2D tex;													\n"
	"uniform sampler3D clut;												\n"
	"uniform float scale;													\n"
	"uniform float offset;													\n"
	"uniform float checkersize;												\n"
	"uniform vec3 color0;													\n"
	"uniform vec3 color1;													\n"
	"																		\n"
	"void main(void)														\n"
	"{																		\n"
	"    vec3 bg = checker(gl_FragCoord.xy / checkersize, color0, color1);	\n"
	"    vec4 img4 = texture2D(tex, gl_TexCoord[0].xy);						\n"
	"    vec3 img3 = img4.bgr;												\n"
	"    img3 = img3 * scale + offset;										\n"
	"    img3 = texture3D(clut, img3).rgb;									\n"
	"																		\n"
	"    gl_FragColor = vec4(img3 * img4.a + bg * (1.0 - img4.a), 1.0);		\n"
	"}																		\n"
	);
	cogl_shader_compile(shader);
	gchar *err = cogl_shader_get_info_log(shader);
	DEBUG_3("%s\n",err);
	g_free(err);

	program = cogl_create_program ();
	cogl_program_attach_shader (program, shader);
	cogl_handle_unref (shader);
	cogl_program_link (program);

	uniform_no = cogl_program_get_uniform_location (program, "tex");
	cogl_program_set_uniform_1i (program, uniform_no, 0);

	uniform_no = cogl_program_get_uniform_location (program, "clut");
	cogl_program_set_uniform_1i (program, uniform_no, 1);

	uniform_no = cogl_program_get_uniform_location (program, "scale");
	cogl_program_set_uniform_1f (program, uniform_no, (double) (CLUT_SIZE - 1) / CLUT_SIZE);

	uniform_no = cogl_program_get_uniform_location (program, "offset");
	cogl_program_set_uniform_1f (program, uniform_no, 1.0 / (2 * CLUT_SIZE));

	uniform_no = cogl_program_get_uniform_location (program, "checkersize");
	cogl_program_set_uniform_1f (program, uniform_no, shaderInfo->checkersize);

	uniform_no = cogl_program_get_uniform_location (program, "color0");
	cogl_program_set_uniform_float (program, uniform_no, 3, 1, shaderInfo->checkercolor0);

	uniform_no = cogl_program_get_uniform_location (program, "color1");
	cogl_program_set_uniform_float (program, uniform_no, 3, 1, shaderInfo->checkercolor1);

	cogl_material_set_user_program (material, program);
	cogl_handle_unref (program);
}


static void rc_prepare_post_process_lut(RendererClutter *rc)
{
	PixbufRenderer *pr = rc->pr;
	static guchar clut[CLUT_SIZE * CLUT_SIZE * CLUT_SIZE * 3];
	guint r, g, b;
	GdkPixbuf *tmp_pixbuf;
	CoglHandle material;
	CoglHandle tex3d;

	DEBUG_3("%s clut start", get_exec_time());

	for (r = 0; r < CLUT_SIZE; r++)
		{
		for (g = 0; g < CLUT_SIZE; g++)
			{
			for (b = 0; b < CLUT_SIZE; b++)
				{
				guchar *ptr = clut + ((b * CLUT_SIZE + g) * CLUT_SIZE + r) * 3;
				ptr[0] = floor ((double) r / (CLUT_SIZE - 1) * 255.0 + 0.5);
				ptr[1] = floor ((double) g / (CLUT_SIZE - 1) * 255.0 + 0.5);
				ptr[2] = floor ((double) b / (CLUT_SIZE - 1) * 255.0 + 0.5);
				}
			}
		}
	tmp_pixbuf = gdk_pixbuf_new_from_data(clut, GDK_COLORSPACE_RGB, FALSE, 8,
					      CLUT_SIZE * CLUT_SIZE,
					      CLUT_SIZE,
					      CLUT_SIZE * CLUT_SIZE * 3,
					      NULL, NULL);
	if (pr->func_post_process)
		{
		pr->func_post_process(pr, &tmp_pixbuf, 0, 0, CLUT_SIZE * CLUT_SIZE, CLUT_SIZE, pr->post_process_user_data);
		}
	g_object_unref(tmp_pixbuf);

	DEBUG_3("%s clut upload start", get_exec_time());
#if COGL_VERSION_CHECK(1,18,2)
	{
	CoglContext *ctx = clutter_backend_get_cogl_context(clutter_get_default_backend ());

	tex3d = cogl_texture_3d_new_from_data(ctx,
					      CLUT_SIZE, CLUT_SIZE, CLUT_SIZE,
					      COGL_PIXEL_FORMAT_RGB_888,
					      CLUT_SIZE * 3,
					      CLUT_SIZE * CLUT_SIZE * 3,
					      clut,
					      NULL);
	}
#elif COGL_VERSION_CHECK(1,10,4)
	{
	CoglContext *ctx = clutter_backend_get_cogl_context(clutter_get_default_backend ());

	tex3d = cogl_texture_3d_new_from_data(ctx,
					      CLUT_SIZE, CLUT_SIZE, CLUT_SIZE,
					      COGL_PIXEL_FORMAT_RGB_888,
					      COGL_PIXEL_FORMAT_RGB_888,
					      CLUT_SIZE * 3,
					      CLUT_SIZE * CLUT_SIZE * 3,
					      clut,
					      NULL);
	}
#else
	tex3d = cogl_texture_3d_new_from_data(CLUT_SIZE, CLUT_SIZE, CLUT_SIZE,
					      COGL_TEXTURE_NONE,
					      COGL_PIXEL_FORMAT_RGB_888,
					      COGL_PIXEL_FORMAT_RGB_888,
					      CLUT_SIZE * 3,
					      CLUT_SIZE * CLUT_SIZE * 3,
					      clut,
					      NULL);
#endif
	material = clutter_texture_get_cogl_material(CLUTTER_TEXTURE(rc->texture));
	cogl_material_set_layer(material, 1, tex3d);
	cogl_handle_unref(tex3d);
	DEBUG_3("%s clut end", get_exec_time());
	rc->clut_updated = TRUE;
}



static void rc_sync_actor(RendererClutter *rc)
{
	PixbufRenderer *pr = rc->pr;
	gint anchor_x = 0;
	gint anchor_y = 0;
	gint rot_z = 0;
	gint rot_y = 0;

	clutter_actor_set_anchor_point(CLUTTER_ACTOR(rc->texture), 0, 0);

	DEBUG_3("scale %d %d", rc->pr->width, rc->pr->height);
	DEBUG_3("pos   %d %d", rc->pr->x_offset, rc->pr->y_offset);

	clutter_actor_set_scale(CLUTTER_ACTOR(rc->texture),
			        (gfloat)pr->width / pr->image_width,
			        (gfloat)pr->height / pr->image_height);

	switch (pr->orientation)
		{
		case EXIF_ORIENTATION_TOP_LEFT:
			/* 1 - Horizontal (normal)  */
			break;
		case EXIF_ORIENTATION_TOP_RIGHT:
			/* 2 - Mirror horizontal */
			rot_y = 180;
			anchor_x = pr->width;
			break;
		case EXIF_ORIENTATION_BOTTOM_RIGHT:
			/* 3 - Rotate 180 */
			rot_z = 180;
			anchor_x = pr->width;
			anchor_y = pr->height;
			break;
		case EXIF_ORIENTATION_BOTTOM_LEFT:
			/* 4 - Mirror vertical */
			rot_z = 180;
			rot_y = 180;
			anchor_y = pr->height;
			break;
		case EXIF_ORIENTATION_LEFT_TOP:
			/* 5 - Mirror horizontal and rotate 270 CW */
			rot_z = 270;
			rot_y = 180;
			break;
		case EXIF_ORIENTATION_RIGHT_TOP:
			/* 6 - Rotate 90 CW */
			rot_z = 90;
			anchor_x = pr->width;
			break;
		case EXIF_ORIENTATION_RIGHT_BOTTOM:
			/* 7 - Mirror horizontal and rotate 90 CW */
			rot_z = 90;
			rot_y = 180;
			anchor_x = pr->width;
			anchor_y = pr->height;
			break;
		case EXIF_ORIENTATION_LEFT_BOTTOM:
			/* 8 - Rotate 270 CW */
			rot_z = 270;
			anchor_y = pr->height;
			break;
		default:
			/* The other values are out of range */
			break;
		}

	clutter_actor_set_rotation(	CLUTTER_ACTOR(rc->texture),
								CLUTTER_Z_AXIS,
								rot_z, 0, 0, 0);
	clutter_actor_set_rotation(	CLUTTER_ACTOR(rc->texture),
								CLUTTER_Y_AXIS,
								rot_y, 0, 0, 0);

	clutter_actor_set_position(CLUTTER_ACTOR(rc->texture),
				pr->x_offset - pr->x_scroll + anchor_x,
				pr->y_offset - pr->y_scroll + anchor_y);

}


static void rc_area_clip_add(RendererClutter *rc, gfloat x, gfloat y, gfloat w, gfloat h)
{
	gfloat x2, y2;
	gfloat clip_x, clip_y, clip_w, clip_h, clip_x2, clip_y2;

	x2 = x + w;
	y2 = y + h;

	clutter_actor_get_clip(rc->texture, &clip_x, &clip_y, &clip_w, &clip_h);

	clip_x2 = clip_x + clip_w;
	clip_y2 = clip_y + clip_h;

	if (clip_x > x) clip_x = x;
	if (clip_x2 < x2) clip_x2 = x2;
	if (clip_y > y) clip_y = y;
	if (clip_y2 < y2) clip_y2 = y2;

	clip_w = clip_x2 - clip_x;
	clip_h = clip_y2 - clip_y;

	clutter_actor_set_clip(rc->texture, clip_x, clip_y, clip_w, clip_h);
}

#define MAX_REGION_AREA (32768 * 1024)

static gboolean rc_area_changed_cb(gpointer data);

static void rc_schedule_texture_upload(RendererClutter *rc)
{
	if (g_get_monotonic_time() - rc->last_pixbuf_change < 50000)
		{
		/* delay clutter redraw until the texture has some data
		   set priority between gtk redraw and clutter redraw */
		DEBUG_3("%s tex upload high prio", get_exec_time());
		rc->idle_update = g_idle_add_full(CLUTTER_PRIORITY_REDRAW - 10, rc_area_changed_cb, rc, NULL);
		}
	else
		{
		/* higher prio than histogram */
		DEBUG_3("%s tex upload low prio", get_exec_time());

		rc->idle_update = g_idle_add_full(G_PRIORITY_DEFAULT_IDLE - 5, rc_area_changed_cb, rc, NULL);
		}
}

static gboolean rc_area_changed_cb(gpointer data)
{
	RendererClutter *rc = (RendererClutter *)data;
	PixbufRenderer *pr = rc->pr;

	RendererClutterAreaParam *par = rc->pending_updates->data;

	gint h = MAX_REGION_AREA / par->w;
	if (h == 0) h = 1;
	if (h > par->h) h = par->h;


	DEBUG_3("%s upload start", get_exec_time());
	if (pr->pixbuf)
		{
		CoglHandle texture = clutter_texture_get_cogl_texture(CLUTTER_TEXTURE(rc->texture));

		cogl_texture_set_region(texture,
					par->x + GET_RIGHT_PIXBUF_OFFSET(rc),
					par->y,
					par->x,
					par->y,
					par->w,
					h,
					par->w,
					h,
					gdk_pixbuf_get_has_alpha(pr->pixbuf) ? COGL_PIXEL_FORMAT_BGRA_8888 : COGL_PIXEL_FORMAT_BGR_888,
					gdk_pixbuf_get_rowstride(pr->pixbuf),
					gdk_pixbuf_get_pixels(pr->pixbuf));
		}
	DEBUG_3("%s upload end", get_exec_time());
	rc_area_clip_add(rc, par->x, par->y, par->w, h);


	par->y += h;
	par->h -= h;

	if (par->h == 0)
		{
		rc->pending_updates = g_list_remove(rc->pending_updates, par);
		g_free(par);
		}
	if (!rc->pending_updates)
		{
		clutter_actor_queue_redraw(CLUTTER_ACTOR(rc->texture));
		rc->idle_update = 0;

		/* FIXME: find a better place for this */
		if (!rc->clut_updated) rc_prepare_post_process_lut(rc);

		return FALSE;
		}

	rc_schedule_texture_upload(rc);

	return FALSE; /* it was rescheduled, possibly with different prio */
}


static void rc_area_changed(void *renderer, gint src_x, gint src_y, gint src_w, gint src_h)
{
	RendererClutter *rc = (RendererClutter *)renderer;
	PixbufRenderer *pr = rc->pr;
	RendererClutterAreaParam *par;

	gint width = gdk_pixbuf_get_width(pr->pixbuf);
	gint height = gdk_pixbuf_get_height(pr->pixbuf);

	if (pr->stereo_data == STEREO_PIXBUF_SBS || pr->stereo_data == STEREO_PIXBUF_CROSS)
			{
			width /= 2;
			}

	if (!pr_clip_region(src_x, src_y, src_w, src_h,
						GET_RIGHT_PIXBUF_OFFSET(rc), 0, width, height,
						&src_x, &src_y, &src_w, &src_h)) return;

	par = g_new0(RendererClutterAreaParam, 1);
	par->rc = rc;
	par->x = src_x - GET_RIGHT_PIXBUF_OFFSET(rc);
	par->y = src_y;
	par->w = src_w;
	par->h = src_h;
	rc->pending_updates = g_list_append(rc->pending_updates, par);
	if (!rc->idle_update)
		{
		rc_schedule_texture_upload(rc);
		}
}

static void rc_remove_pending_updates(RendererClutter *rc)
{
	if (rc->idle_update) g_idle_remove_by_data(rc);
	rc->idle_update = 0;
	while (rc->pending_updates)
		{
		RendererClutterAreaParam *par = rc->pending_updates->data;
		rc->pending_updates = g_list_remove(rc->pending_updates, par);
		g_free(par);
		}
}

static void rc_update_pixbuf(void *renderer, gboolean lazy)
{
	RendererClutter *rc = (RendererClutter *)renderer;
	PixbufRenderer *pr = rc->pr;

	DEBUG_3("rc_update_pixbuf");

	rc_remove_pending_updates(rc);

	rc->last_pixbuf_change = g_get_monotonic_time();
	DEBUG_3("%s change time reset", get_exec_time());

	if (pr->pixbuf)
		{
		gint width = gdk_pixbuf_get_width(pr->pixbuf);
		gint height = gdk_pixbuf_get_height(pr->pixbuf);

		DEBUG_3("pixbuf size %d x %d (%d)", width, height, gdk_pixbuf_get_has_alpha(pr->pixbuf) ? 32 : 24);

		gint prev_width, prev_height;

		if (pr->stereo_data == STEREO_PIXBUF_SBS || pr->stereo_data == STEREO_PIXBUF_CROSS)
			{
			width /= 2;
			}


		clutter_texture_get_base_size(CLUTTER_TEXTURE(rc->texture), &prev_width, &prev_height);

		if (width != prev_width || height != prev_height)
			{
			/* FIXME use CoglMaterial with multiple textures for background, color management, anaglyph, ... */
			CoglHandle texture = cogl_texture_new_with_size(width,
									height,
									COGL_TEXTURE_NO_AUTO_MIPMAP | COGL_TEXTURE_NO_SLICING,
									gdk_pixbuf_get_has_alpha(pr->pixbuf) ? COGL_PIXEL_FORMAT_BGRA_8888 : COGL_PIXEL_FORMAT_BGR_888);

			if (texture != COGL_INVALID_HANDLE)
				{
				clutter_texture_set_cogl_texture(CLUTTER_TEXTURE(rc->texture), texture);
				cogl_handle_unref(texture);
				}
			}
		clutter_actor_set_clip(rc->texture, 0, 0, 0, 0); /* visible area is extended as area_changed events arrive */
		if (!lazy)
			{
			rc_area_changed(renderer, GET_RIGHT_PIXBUF_OFFSET(rc), 0, width, height);
			}
		}

	rc->clut_updated = FALSE;
}



static void rc_update_zoom(void *renderer, gboolean lazy)
{
	RendererClutter *rc = (RendererClutter *)renderer;

	DEBUG_3("rc_update_zoom");
	rc_sync_actor(rc);
}

static void rc_invalidate_region(void *renderer, gint x, gint y, gint w, gint h)
{
}

static OverlayData *rc_overlay_find(RendererClutter *rc, gint id)
{
	GList *work;

	work = rc->overlay_list;
	while (work)
		{
		OverlayData *od = work->data;
		work = work->next;

		if (od->id == id) return od;
		}

	return NULL;
}

static void rc_overlay_actor_destroy_cb(ClutterActor *actor, gpointer user_data)
{
	OverlayData *od = user_data;
	od->actor = NULL;
}

static void rc_overlay_free(RendererClutter *rc, OverlayData *od)
{
	rc->overlay_list = g_list_remove(rc->overlay_list, od);

	if (od->pixbuf) g_object_unref(G_OBJECT(od->pixbuf));
	if (od->actor) clutter_actor_destroy(od->actor);
	g_free(od);
}

static void rc_overlay_update_position(RendererClutter *rc, OverlayData *od)
{
	gint px, py, pw, ph;

	pw = gdk_pixbuf_get_width(od->pixbuf);
	ph = gdk_pixbuf_get_height(od->pixbuf);
	px = od->x;
	py = od->y;

	if (od->flags & OVL_RELATIVE)
		{
		if (px < 0) px = rc->pr->viewport_width - pw + px;
		if (py < 0) py = rc->pr->viewport_height - ph + py;
		}
	if (od->actor) clutter_actor_set_position(od->actor, px, py);
}

static void rc_overlay_update_positions(RendererClutter *rc)
{
	GList *work;

	work = rc->overlay_list;
	while (work)
		{
		OverlayData *od = work->data;
		work = work->next;

		rc_overlay_update_position(rc, od);
		}
}

static void rc_overlay_free_all(RendererClutter *rc)
{
	GList *work;

	work = rc->overlay_list;
	while (work)
		{
		OverlayData *od = work->data;
		work = work->next;

		rc_overlay_free(rc, od);
		}
}

static gint rc_overlay_add(void *renderer, GdkPixbuf *pixbuf, gint x, gint y, OverlayRendererFlags flags)
{
	RendererClutter *rc = (RendererClutter *)renderer;
	PixbufRenderer *pr = rc->pr;
	OverlayData *od;
	gint id;

	g_return_val_if_fail(IS_PIXBUF_RENDERER(pr), -1);
	g_return_val_if_fail(pixbuf != NULL, -1);

	id = 1;
	while (rc_overlay_find(rc, id)) id++;

	od = g_new0(OverlayData, 1);
	od->id = id;
	od->pixbuf = pixbuf;
	g_object_ref(G_OBJECT(od->pixbuf));
	od->x = x;
	od->y = y;
	od->flags = flags;

	od->actor = gtk_clutter_texture_new();
	g_signal_connect (od->actor, "destroy", G_CALLBACK(rc_overlay_actor_destroy_cb), od);

	gtk_clutter_texture_set_from_pixbuf(GTK_CLUTTER_TEXTURE (od->actor), pixbuf, NULL);
	clutter_container_add_actor(CLUTTER_CONTAINER(rc->group), od->actor);

	rc->overlay_list = g_list_append(rc->overlay_list, od);
	rc_overlay_update_position(rc, od);

	return od->id;
}

static void rc_overlay_set(void *renderer, gint id, GdkPixbuf *pixbuf, gint x, gint y)
{
	RendererClutter *rc = (RendererClutter *)renderer;
	PixbufRenderer *pr = rc->pr;
	OverlayData *od;

	g_return_if_fail(IS_PIXBUF_RENDERER(pr));

	od = rc_overlay_find(rc, id);
	if (!od) return;

	if (pixbuf)
		{
		g_object_ref(G_OBJECT(pixbuf));
		g_object_unref(G_OBJECT(od->pixbuf));
		od->pixbuf = pixbuf;

		od->x = x;
		od->y = y;

		if (od->actor) gtk_clutter_texture_set_from_pixbuf(GTK_CLUTTER_TEXTURE(od->actor), pixbuf, NULL);
		rc_overlay_update_position(rc, od);
		}
	else
		{
		rc_overlay_free(rc, od);
		}
}

static gboolean rc_overlay_get(void *renderer, gint id, GdkPixbuf **pixbuf, gint *x, gint *y)
{
	RendererClutter *rc = (RendererClutter *)renderer;

	PixbufRenderer *pr = rc->pr;
	OverlayData *od;

	g_return_val_if_fail(IS_PIXBUF_RENDERER(pr), FALSE);

	od = rc_overlay_find(rc, id);
	if (!od) return FALSE;

	if (pixbuf) *pixbuf = od->pixbuf;
	if (x) *x = od->x;
	if (y) *y = od->y;

	return TRUE;
}


static void rc_update_viewport(void *renderer)
{
	RendererClutter *rc = (RendererClutter *)renderer;
	ClutterColor stage_color = { 0x00, 0x00, 0x00, 0xff };

	rc->stereo_off_x = 0;
	rc->stereo_off_y = 0;

	if (rc->stereo_mode & PR_STEREO_RIGHT)
		{
		if (rc->stereo_mode & PR_STEREO_HORIZ)
			{
			rc->stereo_off_x = rc->pr->viewport_width;
			}
		else if (rc->stereo_mode & PR_STEREO_VERT)
			{
			rc->stereo_off_y = rc->pr->viewport_height;
			}
		else if (rc->stereo_mode & PR_STEREO_FIXED)
			{
			rc->stereo_off_x = rc->pr->stereo_fixed_x_right;
			rc->stereo_off_y = rc->pr->stereo_fixed_y_right;
			}
		}
	else
		{
		if (rc->stereo_mode & PR_STEREO_FIXED)
			{
			rc->stereo_off_x = rc->pr->stereo_fixed_x_left;
			rc->stereo_off_y = rc->pr->stereo_fixed_y_left;
			}
		}
	DEBUG_3("rc_update_viewport  scale %d %d", rc->pr->width, rc->pr->height);

	clutter_stage_set_color(CLUTTER_STAGE(rc->stage), &stage_color);


	clutter_actor_set_size(rc->group, rc->pr->viewport_width, rc->pr->viewport_height);
	clutter_actor_set_position(rc->group, rc->stereo_off_x, rc->stereo_off_y);

	clutter_actor_set_rotation(CLUTTER_ACTOR(rc->group),
						CLUTTER_Y_AXIS,
						(rc->stereo_mode & PR_STEREO_MIRROR) ? 180 : 0,
						rc->pr->viewport_width / 2.0, 0, 0);

	clutter_actor_set_rotation(CLUTTER_ACTOR(rc->group),
						CLUTTER_X_AXIS,
						(rc->stereo_mode & PR_STEREO_FLIP) ? 180 : 0,
						0, rc->pr->viewport_height / 2.0, 0);

	rc_sync_actor(rc);
	rc_overlay_update_positions(rc);
}

static void rc_scroll(void *renderer, gint x_off, gint y_off)
{
	DEBUG_3("rc_scroll");
	RendererClutter *rc = (RendererClutter *)renderer;

	rc_sync_actor(rc);
}

static void rc_stereo_set(void *renderer, gint stereo_mode)
{
	RendererClutter *rc = (RendererClutter *)renderer;

	rc->stereo_mode = stereo_mode;
}

static void rc_free(void *renderer)
{
	RendererClutter *rc = (RendererClutter *)renderer;
	GtkWidget *widget = gtk_bin_get_child(GTK_BIN(rc->pr));

	rc_remove_pending_updates(rc);

	rc_overlay_free_all(rc);

	if (widget)
		{
		/* widget still exists */
		clutter_actor_destroy(rc->group);
		if (clutter_group_get_n_children(CLUTTER_GROUP(rc->stage)) == 0)
			{
			DEBUG_1("destroy %p", rc->widget);
			/* this was the last user */
			gtk_widget_destroy(rc->widget);
			}
		else
			{
			DEBUG_1("keep %p", rc->widget);
			g_object_unref(G_OBJECT(rc->widget));
			}
		}
	g_free(rc);
}

/* initialize shader for transparency background checker */
static void renderer_clutter_init_checker_shader(RendererClutter *rc)
{
	const RendererClutterShaderInfo info = {
		16.0,				/* checker size */
		{0.6, 0.6, 0.6}, 	/* color 0 */
		{0.4, 0.4, 0.4}  	/* color 1 */
	};
	rc_set_shader(clutter_texture_get_cogl_material(CLUTTER_TEXTURE(rc->texture)), &info);
}

RendererFuncs *renderer_clutter_new(PixbufRenderer *pr)
{
	RendererClutter *rc = g_new0(RendererClutter, 1);

	rc->pr = pr;

	rc->f.area_changed = rc_area_changed;
	rc->f.update_pixbuf = rc_update_pixbuf;
	rc->f.free = rc_free;
	rc->f.update_zoom = rc_update_zoom;
	rc->f.invalidate_region = rc_invalidate_region;
	rc->f.scroll = rc_scroll;
	rc->f.update_viewport = rc_update_viewport;


	rc->f.overlay_add = rc_overlay_add;
	rc->f.overlay_set = rc_overlay_set;
	rc->f.overlay_get = rc_overlay_get;

	rc->f.stereo_set = rc_stereo_set;


	rc->stereo_mode = 0;
	rc->stereo_off_x = 0;
	rc->stereo_off_y = 0;

	rc->idle_update = 0;
	rc->pending_updates = NULL;

	rc->widget = gtk_bin_get_child(GTK_BIN(rc->pr));

	if (rc->widget)
		{
		if (!GTK_CLUTTER_IS_EMBED(rc->widget))
			{
			g_free(rc);
			DEBUG_3("pixbuf renderer has a child of other type than gtk_clutter_embed");
			return NULL;
			}
		}
	else
		{
		rc->widget = gtk_clutter_embed_new();
		gtk_container_add(GTK_CONTAINER(rc->pr), rc->widget);
		}

	gtk_event_box_set_above_child (GTK_EVENT_BOX(rc->pr), TRUE);
	rc->stage = gtk_clutter_embed_get_stage (GTK_CLUTTER_EMBED (rc->widget));

	rc->group = clutter_group_new();
	clutter_container_add_actor(CLUTTER_CONTAINER(rc->stage), rc->group);
	clutter_actor_set_clip_to_allocation(CLUTTER_ACTOR(rc->group), TRUE);

	rc->texture = clutter_texture_new ();
	clutter_container_add_actor(CLUTTER_CONTAINER(rc->group), rc->texture);

	renderer_clutter_init_checker_shader(rc);
	g_object_ref(G_OBJECT(rc->widget));

	gtk_widget_show(rc->widget);
	return (RendererFuncs *) rc;
}

#endif
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