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/* synthesize a surface texture */
#include <stdlib.h>
#include <math.h>
#include "wetpix.h"
void
wet_layer_maketexture(WetLayer * layer,
double height, double blurh, double blurv)
{
int x, y;
int width = layer->width;
int lheight = layer->height;
int rowstride = layer->rowstride;
WetPix *wet_line = layer->buf;
double hscale = 128 * height / RAND_MAX;
int lh;
int ibh, ibv;
ibh = floor(256 * blurh + 0.5);
#ifdef VERBOSE
g_print("ibh = %d\n", ibh);
#endif
ibv = floor(256 * blurv + 0.5);
for (y = 0; y < lheight; y++) {
for (x = 0; x < width; x++) {
wet_line[x].h = floor(128 + hscale * rand());
}
/* g_print ("%d\n", wet_line[0].h); */
wet_line += rowstride;
}
wet_line = layer->buf;
for (y = 0; y < lheight; y++) {
lh = wet_line[0].h;
for (x = 1; x < width; x++) {
wet_line[x].h +=
((lh - wet_line[x].h) * ibh + 128) >> 8;
lh = wet_line[x].h;
}
wet_line += rowstride;
}
#if 0
for (x = 0; x < width; x++) {
wet_line = layer->buf + x;
lh = wet_line[0].h;
for (y = 1; y < lheight; y++) {
wet_line += rowstride;
wet_line[0].h +=
((lh - wet_line[0].h) * ibv + 128) >> 8;
lh = wet_line[0].h;
}
}
#endif
}
void wet_layer_clone_texture(WetLayer * dst, WetLayer * src)
{
int x, y;
int width = src->width;
WetPix *dst_line = dst->buf;
WetPix *src_line = src->buf;
for (y = 0; y < src->height; y++) {
for (x = 0; x < width; x++) {
dst_line[x].h = src_line[x].h;
}
dst_line += dst->rowstride;
src_line += src->rowstride;
}
}
void
wet_pack_maketexture(WetPack * pack,
double height, double blurh, double blurv)
{
int i;
wet_layer_maketexture(pack->layers[0], height, blurh, blurv);
for (i = 1; i < pack->n_layers; i++)
wet_layer_clone_texture(pack->layers[i], pack->layers[0]);
}
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