node_texture_bricks.c

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/*
 * 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.
 */
 
#include "NOD_texture.h"
#include "node_texture_util.h"
 
#include <math.h>
 
static bNodeSocketTemplate inputs[] = {
    {SOCK_RGBA, N_("Bricks 1"), 0.596f, 0.282f, 0.0f, 1.0f},
    {SOCK_RGBA, N_("Bricks 2"), 0.632f, 0.504f, 0.05f, 1.0f},
    {SOCK_RGBA, N_("Mortar"), 0.0f, 0.0f, 0.0f, 1.0f},
    {SOCK_FLOAT, N_("Thickness"), 0.02f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, PROP_UNSIGNED},
    {SOCK_FLOAT, N_("Bias"), 0.0f, 0.0f, 0.0f, 0.0f, -1.0f, 1.0f, PROP_NONE},
    {SOCK_FLOAT, N_("Brick Width"), 0.5f, 0.0f, 0.0f, 0.0f, 0.001f, 99.0f, PROP_UNSIGNED},
    {SOCK_FLOAT, N_("Row Height"), 0.25f, 0.0f, 0.0f, 0.0f, 0.001f, 99.0f, PROP_UNSIGNED},
    {-1, ""},
};
static bNodeSocketTemplate outputs[] = {
    {SOCK_RGBA, N_("Color")},
    {-1, ""},
};
 
static void init(bNodeTree *UNUSED(ntree), bNode *node)
{
  node->custom3 = 0.5; /* offset */
  node->custom4 = 1.0; /* squash */
}
 
static float noise(int n) /* fast integer noise */
{
  int nn;
  n = (n >> 13) ^ n;
  nn = (n * (n * n * 60493 + 19990303) + 1376312589) & 0x7fffffff;
  return 0.5f * ((float)nn / 1073741824.0f);
}
 
static void colorfn(float *out, TexParams *p, bNode *node, bNodeStack **in, short thread)
{
  const float *co = p->co;
 
  float x = co[0];
  float y = co[1];
 
  int bricknum, rownum;
  float offset = 0;
  float ins_x, ins_y;
  float tint;
 
  float bricks1[4];
  float bricks2[4];
  float mortar[4];
 
  float mortar_thickness = tex_input_value(in[3], p, thread);
  float bias = tex_input_value(in[4], p, thread);
  float brick_width = tex_input_value(in[5], p, thread);
  float row_height = tex_input_value(in[6], p, thread);
 
  tex_input_rgba(bricks1, in[0], p, thread);
  tex_input_rgba(bricks2, in[1], p, thread);
  tex_input_rgba(mortar, in[2], p, thread);
 
  rownum = (int)floor(y / row_height);
 
  if (node->custom1 && node->custom2) {
    brick_width *= ((int)(rownum) % node->custom2) ? 1.0f : node->custom4;        /* squash */
    offset = ((int)(rownum) % node->custom1) ? 0 : (brick_width * node->custom3); /* offset */
  }
 
  bricknum = (int)floor((x + offset) / brick_width);
 
  ins_x = (x + offset) - brick_width * bricknum;
  ins_y = y - row_height * rownum;
 
  tint = noise((rownum << 16) + (bricknum & 0xFFFF)) + bias;
  CLAMP(tint, 0.0f, 1.0f);
 
  if (ins_x < mortar_thickness || ins_y < mortar_thickness ||
      ins_x > (brick_width - mortar_thickness) || ins_y > (row_height - mortar_thickness)) {
    copy_v4_v4(out, mortar);
  }
  else {
    copy_v4_v4(out, bricks1);
    ramp_blend(MA_RAMP_BLEND, out, tint, bricks2);
  }
}
 
static void exec(void *data,
                 int UNUSED(thread),
                 bNode *node,
                 bNodeExecData *execdata,
                 bNodeStack **in,
                 bNodeStack **out)
{
  tex_output(node, execdata, in, out[0], &colorfn, data);
}
 
void register_node_type_tex_bricks(void)
{
  static bNodeType ntype;
 
  tex_node_type_base(&ntype, TEX_NODE_BRICKS, "Bricks", NODE_CLASS_PATTERN, NODE_PREVIEW);
  node_type_socket_templates(&ntype, inputs, outputs);
  node_type_size_preset(&ntype, NODE_SIZE_MIDDLE);
  node_type_init(&ntype, init);
  node_type_exec(&ntype, NULL, NULL, exec);
 
  nodeRegisterType(&ntype);
}