float Get(float x,float y)
{
float vec[2];
vec[0] = x;
vec[1] = y;
return perlin_noise_2D(vec);
}
static void
render_blob (GLfloat ***data, int numstrips, int striplength, int front)
{
int i;
grab_transform ();
for (i = 0; i < numstrips; i++)
{
int j;
float texcoords[3 * striplength];
GLfloat v[striplength][3];
int all_positive = 1;
int all_negative = 1;
for (j = 0; j < striplength; j++)
{
GLfloat x;
memcpy (&v[j], data[i][j], sizeof (float) * 3);
x = perlin_noise_2D (15 + 3 * v[j][1] + blob_phase * 0.3,
15 + 2 * v[j][0] + blob_phase * 0.4, 1) * 0.35;
v[j][0] += x * 0.5;
v[j][1] += x * 0.25;
v[j][2] += x * 0.15;
parabolic_texcoords (&texcoords[j * 3], v, data[i][j], front);
if (texcoords[j * 3 + 2] < 0)
all_positive = 0;
if (texcoords[j * 3 + 2] > 0)
all_negative = 0;
}
if ((front && !all_negative) || (!front && !all_positive))
{
glBegin (GL_TRIANGLE_STRIP);
for (j = 0; j < striplength; j++)
{
glTexCoord2f (texcoords[j * 3], texcoords[j * 3 + 1]);
glVertex3fv (&v[j][0]);
}
glEnd ();
}
}
}
static void
draw_box (void)
{
pvr_poly_cxt_t cxt;
pvr_poly_hdr_t poly;
pvr_vertex_t vert;
int x, y;
int ox, oy;
float offset[21][16][2];
pvr_poly_cxt_txr (&cxt, PVR_LIST_OP_POLY,
PVR_TXRFMT_RGB565 | PVR_TXRFMT_NONTWIDDLED, 1024, 512,
warp_texture[1 - warp_active], PVR_FILTER_BILINEAR);
pvr_poly_compile (&poly, &cxt);
for (oy = 0; oy <= 15; oy++)
for (ox = 0; ox <= 20; ox++)
{
offset[ox][oy][0] = 2.0 * perlin_noise_2D (ox, oy + perlin_phase, 2);
offset[ox][oy][1]
= -4.0 - 2.0 * perlin_noise_2D (ox + 40, oy + perlin_phase, 2);
}
for (oy = 0, y = 0; y < 480; oy++, y += 32)
{
pvr_prim (&poly, sizeof (poly));
vert.flags = PVR_CMD_VERTEX;
vert.x = offset[0][oy + 1][0];
vert.y = y + 32 + offset[0][oy + 1][1];
vert.z = DISTORT_DEPTH;
vert.u = 0.0f;
vert.v = (float) (y + 32) / 512.0f;
vert.argb = 0xffffffff;
vert.oargb = 0;
pvr_prim (&vert, sizeof (vert));
vert.x = offset[0][oy][0];
vert.y = y + offset[0][oy][1];
vert.v = (float) y / 512.0f;
pvr_prim (&vert, sizeof (vert));
for (ox = 1, x = 32; x < 640; ox++, x += 32)
{
int is_last = (x == 640 - 32);
vert.x = x + offset[ox][oy + 1][0];
vert.y = y + 32 + offset[ox][oy + 1][1];
vert.u = (float) x / 1024.0f;
vert.v = (float) (y + 32) / 512.0f;
pvr_prim (&vert, sizeof (vert));
if (is_last)
vert.flags = PVR_CMD_VERTEX_EOL;
vert.x = x + offset[ox][oy][0];
vert.y = y + offset[ox][oy][1];
vert.v = (float) y / 512.0f;
pvr_prim (&vert, sizeof (vert));
}
}
rot1 += 0.005;
if (rot1 > 2 * M_PI)
rot1 -= 2 * M_PI;
perlin_phase += 0.03;
}
