GLvector3 glVectorNormalize(GLvector3 v)
{
float length;
length = glVectorLength(v);
if (length < 0.000001f)
return v;
return glVectorScale(v, 1.0f / length);
}
GLvector2 glVectorNormalize (GLvector2 v)
{
float length;
length = glVectorLength (v);
if (length < 0.000001f)
return v;
return v * (1.0f / length);
}
void CDeco::CreateLightTrim (GLvector* chain, int count, float height, int seed, GLrgba color)
{
GLvertex p;
GLvector to;
GLvector out;
int i;
int index;
int prev, next;
float u, v1, v2;
float row;
quad_strip qs;
_color = color;
_center = glVector (0.0f, 0.0f, 0.0f);
qs.index_list.reserve(count * 2 + 2);
for (i = 0; i < count; i++)
_center += chain[i];
_center /= (float)count;
row = (float)(seed % TRIM_ROWS);
v1 = row * TRIM_SIZE;
v2 = (row + 1.0f) * TRIM_SIZE;
index = 0;
u = 0.0f;
for (i = 0; i < count + 1; i++) {
if (i)
u += glVectorLength (chain[i % count] - p.position) * 0.1f;
//Add the bottom point
prev = i - 1;
if (prev < 0)
prev = count + prev;
next = (i + 1) % count;
to = glVectorNormalize (chain[next] - chain[prev]);
out = glVectorCrossProduct (glVector (0.0f, 1.0f, 0.0f), to) * LOGO_OFFSET;
p.position = chain[i % count] + out;
p.uv = glVector (u, v2);
_mesh->VertexAdd (p);
qs.index_list.push_back(index++);
//Top point
p.position.y += height;
p.uv = glVector (u, v1);
_mesh->VertexAdd (p);
qs.index_list.push_back(index++);
}
_mesh->QuadStripAdd (qs);
_texture = TextureId (TEXTURE_TRIM);
_mesh->Compile ();
}
void CDeco::CreateLogo (GLvector2 start, GLvector2 end, float bottom, int seed, GLrgba color)
{
GLvertex p;
quad_strip qs;
float u1, u2, v1, v2;
float top;
float height, length;
GLvector2 center2d;
GLvector to;
GLvector out;
int logo_index;
qs.index_list.push_back(0);
qs.index_list.push_back(1);
qs.index_list.push_back(3);
qs.index_list.push_back(2);
_use_alpha = true;
_color = color;
logo_index = seed % LOGO_ROWS;
to = glVector (start.x, 0.0f, start.y) - glVector (end.x, 0.0f, end.y);
to = glVectorNormalize (to);
out = glVectorCrossProduct (glVector (0.0f, 1.0f, 0.0f), to) * LOGO_OFFSET;
center2d = (start + end) / 2;
_center = glVector (center2d.x, bottom, center2d.y);
length = glVectorLength (start - end);
height = (length / 8.0f) * 1.5f;
top = bottom + height;
u1 = 0.0f;
u2 = 0.5f;//We actually only use the left half of the texture
v1 = (float)logo_index / LOGO_ROWS;
v2 = v1 + (1.0f / LOGO_ROWS);
p.position = glVector (start.x, bottom, start.y) + out;
p.uv = glVector (u1,v1);
_mesh->VertexAdd (p);
p.position = glVector (end.x, bottom, end.y) + out;
p.uv = glVector (u2, v1);
_mesh->VertexAdd (p);
p.position = glVector (end.x, top, end.y) + out;
p.uv = glVector (u2, v2);
_mesh->VertexAdd (p);
p.position = glVector (start.x, top, start.y) + out;
p.uv = glVector (u1, v2);
_mesh->VertexAdd (p);
_mesh->QuadStripAdd (qs);
_texture = TextureId (TEXTURE_LOGOS);
}
void TerraformPrepare ()
{
int x, y;
Region r;
GLcoord from_center;
GLcoord offset;
//Set some defaults
offset.x = RandomVal () % 1024;
offset.y = RandomVal () % 1024;
for (x = 0; x < WORLD_GRID; x++) {
for (y = 0; y < WORLD_GRID; y++) {
memset (&r, 0, sizeof (Region));
sprintf (r.title, "NOTHING");
r.geo_bias = r.geo_detail = 0;
r.mountain_height = 0;
r.grid_pos.x = x;
r.grid_pos.y = y;
r.tree_threshold = 0.15f;
from_center.x = abs (x - WORLD_GRID_CENTER);
from_center.y = abs (y - WORLD_GRID_CENTER);
//Geo scale is a number from -1 to 1. -1 is lowest ocean. 0 is sea level.
//+1 is highest elevation on the island. This is used to guide other derived numbers.
r.geo_scale = glVectorLength (glVector ((float)from_center.x, (float)from_center.y));
r.geo_scale /= (WORLD_GRID_CENTER - OCEAN_BUFFER);
//Create a steep drop around the edge of the world
if (r.geo_scale > 1.0f)
r.geo_scale = 1.0f + (r.geo_scale - 1.0f) * 4.0f;
r.geo_scale = 1.0f - r.geo_scale;
r.geo_scale += (Entropy ((x + offset.x), (y + offset.y)) - 0.5f);
r.geo_scale += (Entropy ((x + offset.x) * FREQUENCY, (y + offset.y) * FREQUENCY) - 0.2f);
r.geo_scale = clamp (r.geo_scale, -1.0f, 1.0f);
if (r.geo_scale > 0.0f)
r.geo_water = 1.0f + r.geo_scale * 16.0f;
r.color_atmosphere = glRgba (0.0f, 0.0f, 0.0f);
r.geo_bias = 0.0f;
r.geo_detail = 0.0f;
r.color_map = glRgba (0.0f);
r.climate = CLIMATE_INVALID;
WorldRegionSet (x, y, r);
}
}
}
