void init_height_map_from_bmp(char *mapfile)
{
point p;
int i, j;
SDL_Surface *img;
img = SDL_LoadBMP(mapfile);
SDL_LockSurface(img);
for(i=0; i<LENGTH; i++)
{
for(j=0; j<HEIGHT; j++)
{
Uint8 *red, *green, *blue;
p = to_world(point(i,j));
world_coord_map[i][j] = vector(p.x, p.y, 0);
int img_x = img->h / HEIGHT;
int img_y = img->w / LENGTH;
Uint32 pix = getpixel(img, i, j);
SDL_Color color = getColor(pix, img->format);
// std::cout<<"test"<<color.r;
//SDL_GetRGB(pix, img->format, red, green, blue);
//double value = (red + green + blue) / 768;
//std::cout<<"Value ="<<value<<std::endl;
map[i][j] = (double)pix / (img->format->BytesPerPixel * 256);
}
}
SDL_UnlockSurface(img);
SDL_FreeSurface(img);
}
bool do_input(point& p_mouse, light_source &light)
{
SDL_Event d;
while (SDL_PollEvent(&d))
{
if (d.type == SDL_QUIT)
return false;
if (d.type == SDL_MOUSEMOTION)
{
int x,y; // Mouse position in screen coordinates
SDL_GetMouseState(&x, &y);
// p_mouse = point(x/(float)LENGTH*(X2-X1)+X1, (float)y/HEIGHT*(Y2-Y1)+Y1);
p_mouse = to_world(point(x,y));
light.loc.x = p_mouse.x;
light.loc.y = p_mouse.y;
redraw = true;
// std::cout << map[x][y] << std::endl;
}
if (d.type == SDL_MOUSEBUTTONDOWN)
{
switch(d.button.button)
{
case 4:
if (light.loc.z > .3)
light.loc.z -= .2;
break;
case 5:
light.loc.z += .2;
break;
}
//std::cout << "Light location changed to: " << light.loc << std::endl;
}
if (d.type == SDL_KEYDOWN)
{
switch (d.key.keysym.sym)
{
case (SDLK_q):
{
return false;
break;
}
}
}
}
return true;
}
void init_height_map()
{
int i, j;
point p;
double temp;
for (i=0; i<LENGTH; i++)
for (j=0; j<HEIGHT; j++) {
p = to_world(point(i,j));
world_coord_map[i][j] = vector(p.x, p.y, 0);
temp = f(p);
// Set boundaries to 0, for sanity
// if (i==0 || j==0 || i==(LENGTH-1) || j==(HEIGHT-1))
// temp = 0;
map[i][j] = temp;
old_map[i][j] = temp;
}
}
int DiagSplit::T(Patch *patch, float2 Pstart, float2 Pend)
{
float3 Plast = make_float3(0.0f, 0.0f, 0.0f);
float Lsum = 0.0f;
float Lmax = 0.0f;
for(int i = 0; i < params.test_steps; i++) {
float t = i/(float)(params.test_steps-1);
float3 P = to_world(patch, Pstart + t*(Pend - Pstart));
if(i > 0) {
float L;
if(!params.camera) {
L = len(P - Plast);
}
else {
Camera* cam = params.camera;
float pixel_width = cam->world_to_raster_size((P + Plast) * 0.5f);
L = len(P - Plast) / pixel_width;
}
Lsum += L;
Lmax = max(L, Lmax);
}
Plast = P;
}
int tmin = (int)ceil(Lsum/params.dicing_rate);
int tmax = (int)ceil((params.test_steps-1)*Lmax/params.dicing_rate); // XXX paper says N instead of N-1, seems wrong?
if(tmax - tmin > params.split_threshold)
return DSPLIT_NON_UNIFORM;
return tmax;
}
