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