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Copy pathmesh.cpp
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executable file
·146 lines (130 loc) · 6.1 KB
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#include "mesh.h"
#include <string>
#include <fstream>
#include "utilities.h"
#include <cmath>
mesh::mesh() :texture_size(1, 1){}
mesh mesh::cube(){
mesh ret;
ret.vertices.reserve(36);
ret.indices.reserve(36);
ret.vertices.push_back(vertex(point3d(0.5, -0.5, -0.5), point3d(0, 0, 0), point2d(1, 0)));
ret.vertices.push_back(vertex(point3d(-0.5, -0.5, -0.5),point3d(0,0,0),point2d(0,0)));
ret.vertices.push_back(vertex(point3d(-0.5, 0.5, -0.5), point3d(0, 0, 0), point2d(0, 1)));
ret.vertices.push_back(vertex(point3d(0.5, -0.5, -0.5), point3d(0, 0, 0), point2d(1, 0)));
ret.vertices.push_back(vertex(point3d(-0.5, 0.5, -0.5), point3d(0, 0, 0), point2d(0, 1)));
ret.vertices.push_back(vertex(point3d(0.5, 0.5, -0.5), point3d(0, 0, 0), point2d(1, 1)));
ret.vertices.push_back(vertex(point3d(-0.5, -0.5, 0.5), point3d(0, 0, 0), point2d(0, 0)));
ret.vertices.push_back(vertex(point3d(0.5, -0.5, 0.5), point3d(0, 0, 0), point2d(1, 0)));
ret.vertices.push_back(vertex(point3d(-0.5, 0.5, 0.5), point3d(0, 0, 0), point2d(0, 1)));
ret.vertices.push_back(vertex(point3d(-0.5, 0.5, 0.5), point3d(0, 0, 0), point2d(0, 1)));
ret.vertices.push_back(vertex(point3d(0.5, -0.5, 0.5), point3d(0, 0, 0), point2d(1, 0)));
ret.vertices.push_back(vertex(point3d(0.5, 0.5, 0.5), point3d(0, 0, 0), point2d(1, 1)));
ret.vertices.push_back(vertex(point3d(-0.5, -0.5, -0.5), point3d(0, 0, 0), point2d(0, 0)));
ret.vertices.push_back(vertex(point3d(0.5, -0.5, -0.5), point3d(0, 0, 0), point2d(1, 0)));
ret.vertices.push_back(vertex(point3d(-0.5, -0.5, 0.5), point3d(0, 0, 0), point2d(0, 1)));
ret.vertices.push_back(vertex(point3d(-0.5, -0.5, 0.5), point3d(0, 0, 0), point2d(0, 1)));
ret.vertices.push_back(vertex(point3d(0.5, -0.5, -0.5), point3d(0, 0, 0), point2d(1, 0)));
ret.vertices.push_back(vertex(point3d(0.5, -0.5, 0.5), point3d(0, 0, 0), point2d(1, 1)));
ret.vertices.push_back(vertex(point3d(0.5, 0.5, -0.5), point3d(0, 0, 0), point2d(1, 0)));
ret.vertices.push_back(vertex(point3d(-0.5, 0.5, -0.5), point3d(0, 0, 0), point2d(0, 0)));
ret.vertices.push_back(vertex(point3d(-0.5, 0.5, 0.5), point3d(0, 0, 0), point2d(0, 1)));
ret.vertices.push_back(vertex(point3d(0.5, 0.5, -0.5), point3d(0, 0, 0), point2d(1, 0)));
ret.vertices.push_back(vertex(point3d(-0.5, 0.5, 0.5), point3d(0, 0, 0), point2d(0, 1)));
ret.vertices.push_back(vertex(point3d(0.5, 0.5, 0.5), point3d(0, 0, 0), point2d(1, 1)));
ret.vertices.push_back(vertex(point3d(-0.5, 0.5, -0.5), point3d(0, 0, 0), point2d(1, 0)));
ret.vertices.push_back(vertex(point3d(-0.5, -0.5, -0.5), point3d(0, 0, 0), point2d(0, 0)));
ret.vertices.push_back(vertex(point3d(-0.5, -0.5, 0.5), point3d(0, 0, 0), point2d(0, 1)));
ret.vertices.push_back(vertex(point3d(-0.5, 0.5, -0.5), point3d(0, 0, 0), point2d(1, 0)));
ret.vertices.push_back(vertex(point3d(-0.5, -0.5, 0.5), point3d(0, 0, 0), point2d(0, 1)));
ret.vertices.push_back(vertex(point3d(-0.5, 0.5, 0.5), point3d(0, 0, 0), point2d(1, 1)));
ret.vertices.push_back(vertex(point3d(0.5, -0.5, -0.5), point3d(0, 0, 0), point2d(0, 0)));
ret.vertices.push_back(vertex(point3d(0.5, 0.5, -0.5), point3d(0, 0, 0), point2d(1, 0)));
ret.vertices.push_back(vertex(point3d(0.5, -0.5, 0.5), point3d(0, 0, 0), point2d(0, 1)));
ret.vertices.push_back(vertex(point3d(0.5, -0.5, 0.5), point3d(0, 0, 0), point2d(0, 1)));
ret.vertices.push_back(vertex(point3d(0.5, 0.5, -0.5), point3d(0, 0, 0), point2d(1, 0)));
ret.vertices.push_back(vertex(point3d(0.5, 0.5, 0.5), point3d(0, 0, 0), point2d(1, 1)));
for (size_t i = 0; i < ret.vertices.size()/3; i++){
ret.indices.push_back(i*3);
ret.indices.push_back(i * 3+1);
ret.indices.push_back(i * 3+2);
}
return ret;
}
mesh mesh::open_OBJ(const std::string &p_path){
mesh ret;
std::ifstream file(p_path, std::ios::binary | std::ios::in);
std::string tmp;
while (file>>tmp){
if (tmp == "v"){
double a, b, c;
file >> a >> b >> c;
ret.vertices.push_back(vertex(point3d(a, b, c)));
}
if (tmp == "f"){
std::string a, b, c;
file >> a >> b >> c;
ret.indices.push_back(std::stoi(a) - 1);
ret.indices.push_back(std::stoi(b) - 1);
ret.indices.push_back(std::stoi(c) - 1);
}
}
return ret;
}
mesh mesh::open_heightmap(const bitmap &p_bitmap){
mesh ret;
ret.vertices.reserve(p_bitmap.height*p_bitmap.width);
for (size_t i = 0; i < p_bitmap.height; i++){
for (size_t j = 0; j < p_bitmap.width; j++){
double x = static_cast<double>(j) / p_bitmap.width - 0.5;
double y = static_cast<double>(i) / p_bitmap.height - 0.5;
double h = (p_bitmap[i][j].R + p_bitmap[i][j].G + p_bitmap[i][j].B) / 3.0;
double z = h / 255.0 - 0.5;
ret.vertices.push_back(vertex(point3d(x,z,y)));
}
}
for (size_t i = 0; i < p_bitmap.height-1; i++){
for (size_t j = 0; j < p_bitmap.width - 1; j++){
ret.indices.push_back(i*p_bitmap.height + j);
ret.indices.push_back(i*p_bitmap.height + j + 1);
ret.indices.push_back((i + 1)*p_bitmap.height + j);
ret.indices.push_back((i + 1)*p_bitmap.height + j + 1);
ret.indices.push_back((i + 1)*p_bitmap.height + j);
ret.indices.push_back(i*p_bitmap.height + j + 1);
}
}
return ret;
}
mesh mesh::sphere(size_t p_density){
mesh ret;
double step = PI * 2 / p_density;
double stepx = 0;
double stepy = 0;
double tex = 1.0 / p_density;
for (size_t i = 0; i <= p_density; i++)
{
double rad = (double)sin(stepy);
for (size_t j = 0; j <= p_density; j++)
{
ret.vertices.push_back(vertex(point3d(rad * sin(stepx) * 1 / 2.0, cos(stepy) * 1 / 2.0 , rad * cos(stepx) * 1 / 2.0), point3d(0, 0, 0), point2d(tex * j, tex * i)));
stepx += step;
}
stepx = 0;
stepy += step / 2;
}
for (size_t i = 0; i < p_density; i++)
{
for (size_t j = 0; j < p_density; j++)
{
int ii = i + 1;
int jj = j + 1;
ret.indices.push_back(jj + i * (p_density + 1));
ret.indices.push_back(j + i * (p_density + 1));
ret.indices.push_back(jj + ii * (p_density + 1));
ret.indices.push_back(j + i * (p_density + 1));
ret.indices.push_back(j + ii * (p_density + 1));
ret.indices.push_back(jj + ii * (p_density + 1));
}
}
return ret;
}