node_texture_image.c

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/*
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * 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.
 *
 * The Original Code is Copyright (C) 2006 Blender Foundation.
 * All rights reserved.
 *
 * The Original Code is: all of this file.
 *
 * Contributor(s): Robin Allen
 *
 * ***** END GPL LICENSE BLOCK *****
 */

#include "node_texture_util.h"
#include "NOD_texture.h"

static bNodeSocketTemplate outputs[]= {
    { SOCK_RGBA, 0, "Image"},
    { -1, 0, "" }
};

static void colorfn(float *out, TexParams *p, bNode *node, bNodeStack **UNUSED(in), short UNUSED(thread))
{
    float x = p->co[0];
    float y = p->co[1];
    Image *ima= (Image *)node->id;
    ImageUser *iuser= (ImageUser *)node->storage;
    
    if( ima ) {
        ImBuf *ibuf = BKE_image_get_ibuf(ima, iuser);
        if( ibuf ) {
            float xsize, ysize;
            float xoff, yoff;
            int px, py;
            
            float *result;

            xsize = ibuf->x / 2;
            ysize = ibuf->y / 2;
            xoff = yoff = -1;
                    
            px = (int)( (x-xoff) * xsize );
            py = (int)( (y-yoff) * ysize );
        
            if( (!xsize) || (!ysize) ) return;
            
            if( !ibuf->rect_float ) {
                BLI_lock_thread(LOCK_IMAGE);
                if( !ibuf->rect_float )
                    IMB_float_from_rect(ibuf);
                BLI_unlock_thread(LOCK_IMAGE);
            }
            
            while( px < 0 ) px += ibuf->x;
            while( py < 0 ) py += ibuf->y;
            while( px >= ibuf->x ) px -= ibuf->x;
            while( py >= ibuf->y ) py -= ibuf->y;
            
            result = ibuf->rect_float + py*ibuf->x*4 + px*4;
            copy_v4_v4( out, result );
        }
    }
}

static void exec(void *data, bNode *node, bNodeStack **in, bNodeStack **out)
{
    tex_output(node, in, out[0], &colorfn, data);
}

static void init(bNodeTree *UNUSED(ntree), bNode* node, bNodeTemplate *UNUSED(ntemp))
{
    ImageUser *iuser= MEM_callocN(sizeof(ImageUser), "node image user");
    node->storage= iuser;
    iuser->sfra= 1;
    iuser->fie_ima= 2;
    iuser->ok= 1;
}

void register_node_type_tex_image(bNodeTreeType *ttype)
{
    static bNodeType ntype;
    
    node_type_base(ttype, &ntype, TEX_NODE_IMAGE, "Image", NODE_CLASS_INPUT, NODE_PREVIEW|NODE_OPTIONS);
    node_type_socket_templates(&ntype, NULL, outputs);
    node_type_size(&ntype, 120, 80, 300);
    node_type_init(&ntype, init);
    node_type_storage(&ntype, "ImageUser", node_free_standard_storage, node_copy_standard_storage);
    node_type_exec(&ntype, exec);
    
    nodeRegisterType(ttype, &ntype);
}