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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) 2005 Blender Foundation.
* All rights reserved.
*
* The Original Code is: all of this file.
*
* Contributor(s): none yet.
*
* ***** END GPL LICENSE BLOCK *****
*/
/** \file blender/nodes/intern/TEX_util.c
* \ingroup nodes
*/
/*
HOW TEXTURE NODES WORK
In contrast to Shader nodes, which place a color into the output
stack when executed, Texture nodes place a TexDelegate* there. To
obtain a color value from this, a node further up the chain reads
the TexDelegate* from its input stack, and uses tex_call_delegate to
retrieve the color from the delegate.
comments: (ton)
This system needs recode, a node system should rely on the stack, and
callbacks for nodes only should evaluate own node, not recursively go
over other previous ones.
*/
#include <assert.h>
#include "TEX_util.h"
#define PREV_RES 128 /* default preview resolution */
void tex_call_delegate(TexDelegate *dg, float *out, TexParams *params, short thread)
{
if(dg->node->need_exec) {
dg->fn(out, params, dg->node, dg->in, thread);
if(dg->cdata->do_preview)
tex_do_preview(dg->node, params->previewco, out);
}
}
static void tex_input(float *out, int sz, bNodeStack *in, TexParams *params, short thread)
{
TexDelegate *dg = in->data;
if(dg) {
tex_call_delegate(dg, in->vec, params, thread);
if(in->hasoutput && in->sockettype == SOCK_VALUE)
in->vec[1] = in->vec[2] = in->vec[0];
}
memcpy(out, in->vec, sz * sizeof(float));
}
void tex_input_vec(float *out, bNodeStack *in, TexParams *params, short thread)
{
tex_input(out, 3, in, params, thread);
}
void tex_input_rgba(float *out, bNodeStack *in, TexParams *params, short thread)
{
tex_input(out, 4, in, params, thread);
if(in->hasoutput && in->sockettype == SOCK_VALUE)
{
out[1] = out[2] = out[0];
out[3] = 1;
}
if(in->hasoutput && in->sockettype == SOCK_VECTOR) {
out[0] = out[0] * .5f + .5f;
out[1] = out[1] * .5f + .5f;
out[2] = out[2] * .5f + .5f;
out[3] = 1;
}
}
float tex_input_value(bNodeStack *in, TexParams *params, short thread)
{
float out[4];
tex_input_vec(out, in, params, thread);
return out[0];
}
void params_from_cdata(TexParams *out, TexCallData *in)
{
out->co = in->co;
out->dxt = in->dxt;
out->dyt = in->dyt;
out->previewco = in->co;
out->osatex = in->osatex;
out->cfra = in->cfra;
out->shi = in->shi;
out->mtex = in->mtex;
}
void tex_do_preview(bNode *node, float *co, float *col)
{
bNodePreview *preview= node->preview;
if(preview) {
int xs= ((co[0] + 1.0f)*0.5f)*preview->xsize;
int ys= ((co[1] + 1.0f)*0.5f)*preview->ysize;
nodeAddToPreview(node, col, xs, ys, 0); /* 0 = no color management */
}
}
void tex_output(bNode *node, bNodeStack **in, bNodeStack *out, TexFn texfn, TexCallData *cdata)
{
TexDelegate *dg;
if(!out->data)
/* Freed in tex_end_exec (node.c) */
dg = out->data = MEM_mallocN(sizeof(TexDelegate), "tex delegate");
else
dg = out->data;
dg->cdata= cdata;
dg->fn = texfn;
dg->node = node;
memcpy(dg->in, in, MAX_SOCKET * sizeof(bNodeStack*));
dg->type = out->sockettype;
}
void ntreeTexCheckCyclics(struct bNodeTree *ntree)
{
bNode *node;
for(node= ntree->nodes.first; node; node= node->next) {
if(node->type == TEX_NODE_TEXTURE && node->id)
{
/* custom2 stops the node from rendering */
if(node->custom1) {
node->custom2 = 1;
node->custom1 = 0;
} else {
Tex *tex = (Tex *)node->id;
node->custom2 = 0;
node->custom1 = 1;
if(tex->use_nodes && tex->nodetree) {
ntreeTexCheckCyclics(tex->nodetree);
}
node->custom1 = 0;
}
}
}
}
int ntreeTexExecTree(
bNodeTree *nodes,
TexResult *texres,
float *co,
float *dxt, float *dyt,
int osatex,
short thread,
Tex *UNUSED(tex),
short which_output,
int cfra,
int preview,
ShadeInput *shi,
MTex *mtex
){
TexCallData data;
float *nor= texres->nor;
int retval = TEX_INT;
data.co = co;
data.dxt = dxt;
data.dyt = dyt;
data.osatex = osatex;
data.target = texres;
data.do_preview = preview;
data.thread = thread;
data.which_output = which_output;
data.cfra= cfra;
data.mtex= mtex;
data.shi= shi;
ntreeExecTree(nodes, &data, thread);
if(texres->nor) retval |= TEX_NOR;
retval |= TEX_RGB;
/* confusing stuff; the texture output node sets this to NULL to indicate no normal socket was set
however, the texture code checks this for other reasons (namely, a normal is required for material) */
texres->nor= nor;
return retval;
}
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