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#include <stdio.h>
#include <math.h>
#include <sipp.h>
Surf_desc scroll_surf = {
0.3,
0.0,
0.1,
{0.85, 0.85, 0.35},
{1.0, 1.0, 1.0},
};
/*
* Shader to map a pbm bitmap (ugly hardcoded size...)
* onto the scroll. We map it on the middle flat part.
*/
unsigned char scrolltexture[360][113];
int scroll_ready = 0;
void
scroll_shader(pos, normal, texture, view_vec, lights, foo, color, opacity)
Vector *pos;
Vector *normal;
Vector *texture;
Vector *view_vec;
Lightsource *lights;
Surf_desc *foo;
Color *color;
Color *opacity;
{
Surf_desc sd;
FILE *texture_file;
int x, y;
if (!scroll_ready) {
texture_file = fopen("sipp.bm", "r");
fscanf(texture_file, "P4\n%d %d\n", &x, &y);
if (x != 900 || y != 360) {
puts("FOO!");
exit(1);
}
fread(scrolltexture, 1, 113*360, texture_file);
fclose(texture_file);
scroll_ready = 1;
}
sd = scroll_surf;
if (texture->x > 0.2 && texture->x < 0.8) {
x = (texture->x - 0.2) / 0.6 * 900;
y = texture->y * 360;
if (scrolltexture[y][x / 8] & (1 << (7 - (x % 8)))) {
sd.color.red = sd.color.grn = sd.color.blu = 0.0;
}
}
basic_shader(pos, normal, texture, view_vec, lights, &sd,
color, opacity);
}
/*
* FFD which twists the ends of the scroll "paper"
*/
void
scroll_twist(dummy, world, txt, new_world, new_txt)
char *dummy;
Vector *world, *txt, *new_world, *new_txt;
{
double rad;
double ang;
if (txt->x < 0.2) {
ang = (world->x + 2.5) * 3.0 * M_PI / 2.0;
rad = (world->x + 2.5) / 4.0;
new_world->x = cos(ang) * rad - 1.5;
new_world->z = -sin(ang) * rad - 0.25;
new_world->y = world->y + 0.2 - (world->x + 2.5) * 0.2;
} else if (txt->x > 0.8) {
ang = (2.5 - world->x) * 3.0 * M_PI / 2.0;
rad = (2.5 - world->x) / 4.0;
new_world->x = -cos(ang) * rad + 1.5;
new_world->z = sin(ang) * rad + 0.25;
new_world->y = world->y - 0.2 + (2.5 - world->x) * 0.2;
} else {
*new_world = *world;
}
*new_txt = *txt;
}
extern char *optarg;
main(argc, argv)
int argc;
char **argv;
{
Object *scroll;
Surface *scrollsurf;
int i;
FILE *image;
char *imfile_name;
int mode;
int c;
int size;
imfile_name = "scroll.ppm";
mode = PHONG;
size = 256;
while ((c = getopt(argc, argv, "pgfls:")) != EOF) {
switch (c) {
case 'p':
mode = PHONG;
imfile_name = "scroll.ppm";
break;
case 'g':
mode = GOURAUD;
imfile_name = "scroll.ppm";
break;
case 'f':
mode = FLAT;
imfile_name = "scroll.ppm";
break;
case 'l':
mode = LINE;
imfile_name = "scroll.pbm";
break;
case 's':
size = atoi(optarg);
break;
}
}
sipp_init();
sipp_show_backfaces(TRUE);
sipp_background(0.078, 0.361, 0.753); /* UNC sky blue */
sipp_shadows(TRUE, (size<512)?2*size:size);
lightsource_create(3.0, 2.0, 6.0, 0.35, 0.35, 0.35, LIGHT_DIRECTION);
spotlight_create(3.0, 2.0, 6.0,
0.0, 0.0, 0.0,
25.0,
0.45, 0.45, 0.45,
SPOT_SOFT, TRUE);
/*
* Create the scroll object
*/
scroll = object_create();
/*
* Create a surface which is only a long flat
* rectangle made of smaller rectangles.
* It will be twisted to its final form with an ffd.
*/
for (i = 0; i < 100; i++) {
vertex_tx_push(i / 20.0 - 2.5, -0.5, 0.0, i / 100.0, 1.0, 0.0);
vertex_tx_push(i / 20.0 - 2.45, -0.5, 0.0, (i + 1) / 100.0, 1.0, 0.0);
vertex_tx_push(i / 20.0 - 2.45, 0.5, 0.0, (i + 1) / 100.0, 0.0, 0.0);
vertex_tx_push(i / 20.0 - 2.5, 0.5, 0.0, i / 100.0, 0.0, 0.0);
polygon_push();
}
scrollsurf = surface_create(&scroll_surf, scroll_shader);
surface_set_ffd(scrollsurf, scroll_twist, NULL);
object_add_surface(scroll, scrollsurf);
object_rot_x(scroll, -0.1);
object_rot_z(scroll, 0.2);
object_add_subobj(sipp_world, scroll);
camera_params(sipp_camera, 0.0, 0.0, 15.0, 0.0, 0.0, 0.0,
0.0, 1.0, 0.0, 0.125);
printf("Rendering, wait...");
fflush(stdout);
image = fopen(imfile_name, "w");
render_image_file(size, size, image, mode, 3);
printf("Done.\n");
exit(0);
}
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