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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): none yet.
*
* ***** END GPL LICENSE BLOCK *****
*/
/** \file blender/nodes/composite/nodes/node_composite_displace.c
* \ingroup cmpnodes
*/
#include "node_composite_util.h"
/* **************** Displace ******************** */
static bNodeSocketTemplate cmp_node_displace_in[]= {
{ SOCK_RGBA, 1, "Image", 0.8f, 0.8f, 0.8f, 1.0f},
{ SOCK_VECTOR, 1, "Vector", 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, PROP_TRANSLATION},
{ SOCK_FLOAT, 1, "X Scale", 0.0f, 0.0f, 0.0f, 0.0f, -1000.0f, 1000.0f, PROP_FACTOR},
{ SOCK_FLOAT, 1, "Y Scale", 0.0f, 0.0f, 0.0f, 0.0f, -1000.0f, 1000.0f, PROP_FACTOR},
{ -1, 0, "" }
};
static bNodeSocketTemplate cmp_node_displace_out[]= {
{ SOCK_RGBA, 0, "Image"},
{ -1, 0, "" }
};
/* minimum distance (in pixels) a pixel has to be displaced
* in order to take effect */
#define DISPLACE_EPSILON 0.01
static void do_displace(bNode *node, CompBuf *stackbuf, CompBuf *cbuf, CompBuf *vecbuf, float *UNUSED(veccol), CompBuf *xbuf, CompBuf *ybuf, float *xscale, float *yscale)
{
ImBuf *ibuf;
int x, y;
float p_dx, p_dy; /* main displacement in pixel space */
float d_dx, d_dy;
float dxt, dyt;
float u, v;
float xs, ys;
float vec[3], vecdx[3], vecdy[3];
float col[3];
ibuf= IMB_allocImBuf(cbuf->x, cbuf->y, 32, 0);
ibuf->rect_float= cbuf->rect;
for(y=0; y < stackbuf->y; y++) {
for(x=0; x < stackbuf->x; x++) {
/* calc pixel coordinates */
qd_getPixel(vecbuf, x-vecbuf->xof, y-vecbuf->yof, vec);
if (xbuf)
qd_getPixel(xbuf, x-xbuf->xof, y-xbuf->yof, &xs);
else
xs = xscale[0];
if (ybuf)
qd_getPixel(ybuf, x-ybuf->xof, y-ybuf->yof, &ys);
else
ys = yscale[0];
/* clamp x and y displacement to triple image resolution -
* to prevent hangs from huge values mistakenly plugged in eg. z buffers */
CLAMP(xs, -stackbuf->x*4, stackbuf->x*4);
CLAMP(ys, -stackbuf->y*4, stackbuf->y*4);
p_dx = vec[0] * xs;
p_dy = vec[1] * ys;
/* if no displacement, then just copy this pixel */
if (fabsf(p_dx) < DISPLACE_EPSILON && fabsf(p_dy) < DISPLACE_EPSILON) {
qd_getPixel(cbuf, x-cbuf->xof, y-cbuf->yof, col);
qd_setPixel(stackbuf, x, y, col);
continue;
}
/* displaced pixel in uv coords, for image sampling */
u = (x - cbuf->xof - p_dx + 0.5f) / (float)stackbuf->x;
v = (y - cbuf->yof - p_dy + 0.5f) / (float)stackbuf->y;
/* calc derivatives */
qd_getPixel(vecbuf, x-vecbuf->xof+1, y-vecbuf->yof, vecdx);
qd_getPixel(vecbuf, x-vecbuf->xof, y-vecbuf->yof+1, vecdy);
d_dx = vecdx[0] * xs;
d_dy = vecdy[0] * ys;
/* clamp derivatives to minimum displacement distance in UV space */
dxt = p_dx - d_dx;
dyt = p_dy - d_dy;
dxt = signf(dxt)*maxf(fabsf(dxt), DISPLACE_EPSILON)/(float)stackbuf->x;
dyt = signf(dyt)*maxf(fabsf(dyt), DISPLACE_EPSILON)/(float)stackbuf->y;
ibuf_sample(ibuf, u, v, dxt, dyt, col);
qd_setPixel(stackbuf, x, y, col);
if(node->exec & NODE_BREAK) break;
}
if(node->exec & NODE_BREAK) break;
}
IMB_freeImBuf(ibuf);
/* simple method for reference, linear interpolation */
/*
int x, y;
float dx, dy;
float u, v;
float vec[3];
float col[3];
for(y=0; y < stackbuf->y; y++) {
for(x=0; x < stackbuf->x; x++) {
qd_getPixel(vecbuf, x, y, vec);
dx = vec[0] * (xscale[0]);
dy = vec[1] * (yscale[0]);
u = (x - dx + 0.5f) / (float)stackbuf->x;
v = (y - dy + 0.5f) / (float)stackbuf->y;
qd_getPixelLerp(cbuf, u*cbuf->x - 0.5f, v*cbuf->y - 0.5f, col);
qd_setPixel(stackbuf, x, y, col);
}
}
*/
}
static void node_composit_exec_displace(void *UNUSED(data), bNode *node, bNodeStack **in, bNodeStack **out)
{
if(out[0]->hasoutput==0)
return;
if(in[0]->data && in[1]->data) {
CompBuf *cbuf= in[0]->data;
CompBuf *vecbuf= in[1]->data;
CompBuf *xbuf= in[2]->data;
CompBuf *ybuf= in[3]->data;
CompBuf *stackbuf;
cbuf= typecheck_compbuf(cbuf, CB_RGBA);
vecbuf= typecheck_compbuf(vecbuf, CB_VEC3);
xbuf= typecheck_compbuf(xbuf, CB_VAL);
ybuf= typecheck_compbuf(ybuf, CB_VAL);
stackbuf= alloc_compbuf(cbuf->x, cbuf->y, CB_RGBA, 1); /* allocs */
do_displace(node, stackbuf, cbuf, vecbuf, in[1]->vec, xbuf, ybuf, in[2]->vec, in[3]->vec);
out[0]->data= stackbuf;
if(cbuf!=in[0]->data)
free_compbuf(cbuf);
if(vecbuf!=in[1]->data)
free_compbuf(vecbuf);
}
}
void register_node_type_cmp_displace(ListBase *lb)
{
static bNodeType ntype;
node_type_base(&ntype, CMP_NODE_DISPLACE, "Displace", NODE_CLASS_DISTORT, NODE_OPTIONS);
node_type_socket_templates(&ntype, cmp_node_displace_in, cmp_node_displace_out);
node_type_size(&ntype, 140, 100, 320);
node_type_exec(&ntype, node_composit_exec_displace);
nodeRegisterType(lb, &ntype);
}
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