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spheres.hpp
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spheres.hpp
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#include <GL/gl.h>
#define GLEW_STATIC
#include <GL/glew.h>
#include <math.h>
#include "triangles.hpp"
#include "glvec6.hpp"
std::vector<GLfloat> triangles;
void drawTriangle(GLvec6 v1, GLvec6 v2, GLvec6 v3, GLuint &VAO, GLuint &VBO){
triangles.push_back(v1.x);
triangles.push_back(v1.y);
triangles.push_back(v1.z);
triangles.push_back(v1.r);
triangles.push_back(v1.g);
triangles.push_back(v1.b);
triangles.push_back(v2.x);
triangles.push_back(v2.y);
triangles.push_back(v2.z);
triangles.push_back(v2.r);
triangles.push_back(v2.g);
triangles.push_back(v2.b);
triangles.push_back(v3.x);
triangles.push_back(v3.y);
triangles.push_back(v3.z);
triangles.push_back(v3.r);
triangles.push_back(v3.g);
triangles.push_back(v3.b);
}
void subdivide(GLvec6 v1, GLvec6 v2, GLvec6 v3, GLuint &VAO, GLuint &VBO, int level) {
if (level == 0) {
drawTriangle(v1, v2, v3, VAO, VBO);
}
else {
GLvec6 v12 = midpoint(v1, v2);
GLvec6 v13 = midpoint(v1, v3);
GLvec6 v23 = midpoint(v2, v3);
float s = 1.0f/ (float)v12.pos();
v12.x *= s;
v12.y *= s;
v12.z *= s;
s = 1.0f/(float)v13.pos();
v13.x *= s;
v13.y *= s;
v13.z *= s;
s = 1.0f/(float)v23.pos();
v23.x *= s;
v23.y *= s;
v23.z *= s;
subdivide(v1, v12, v13, VAO, VBO, level -1);
subdivide(v12, v2, v23, VAO, VBO, level - 1);
subdivide(v13, v23, v3, VAO, VBO, level - 1);
subdivide(v12, v23, v13, VAO, VBO, level - 1);
}
}
void createSphere(GLuint &VAO, GLuint &VBO, int prec) {
GLvec6 v1, v2, v3;
v1.x = 0.0;
v1.y = 1.0;
v1.z = 0.0;
v1.r = .6;
v1.g = .5;
v1.b = .3;
v2.x = 1.0;
v2.y = 0.0;
v2.z = 0.0;
v2.r = .6;
v2.g = .5;
v2.b = .3;
v3.x = 0.0;
v3.y = 0.0;
v3.z = 1.0;
v3.r = .6;
v3.g = .5;
v3.b = .3;
subdivide(v1, v2, v3, VAO, VBO, prec);
v1.x = 0.0;
v1.y = 1.0;
v1.z = 0.0;
v1.r = .6;
v1.g = .5;
v1.b = .3;
v2.x = -1.0;
v2.y = 0.0;
v2.z = 0.0;
v2.r = .6;
v2.g = .5;
v2.b = .3;
v3.x = 0.0;
v3.y = 0.0;
v3.z = 1.0;
v3.r = .6;
v3.g = .5;
v3.b = .3;
subdivide(v1, v2, v3, VAO, VBO, prec);
v1.x = 0.0;
v1.y = -1.0;
v1.z = 0.0;
v1.r = .6;
v1.g = .5;
v1.b = .3;
v2.x = 1.0;
v2.y = 0.0;
v2.z = 0.0;
v2.r = .6;
v2.g = .5;
v2.b = .3;
v3.x = 0.0;
v3.y = 0.0;
v3.z = 1.0;
v3.r = 0.6;
v3.g = 0.5;
v3.b = 0.3;
subdivide(v1, v2, v3, VAO, VBO, prec);
v1.x = 0.0;
v1.y = -1.0;
v1.z = 0.0;
v1.r = .6;
v1.g = .5;
v1.b = .3;
v2.x = -1.0;
v2.y = 0.0;
v2.z = 0.0;
v2.r = 0.6;
v2.g = 0.5;
v2.b = 0.3;
v3.x = 0.0;
v3.y = 0.0;
v3.z = 1.0;
v3.r = 0.6;
v3.g = 0.5;
v3.b = 0.3;
subdivide(v1, v2, v3, VAO, VBO, prec);
v1.x = 0.0;
v1.y = 1.0;
v1.z = 0.0;
v1.r = .6;
v1.g = .5;
v1.b = .3;
v2.x = 1.0;
v2.y = 0.0;
v2.z = 0.0;
v2.r = 0.6;
v2.g = 0.5;
v2.b = 0.3;
v3.x = 0.0;
v3.y = 0.0;
v3.z = -1.0;
v3.r = 0.6;
v3.g = 0.5;
v3.b = 0.3;
subdivide(v1, v2, v3, VAO, VBO, prec);
v1.x = 0.0;
v1.y = 1.0;
v1.z = 0.0;
v1.r = .6;
v1.g = .5;
v1.b = .3;
v2.x = -1.0;
v2.y = 0.0;
v2.z = 0.0;
v2.r = .6;
v2.g = .5;
v2.b = .3;
v3.x = 0.0;
v3.y = 0.0;
v3.z = -1.0;
v3.r = .6;
v3.g = .5;
v3.b = .3;
subdivide(v1, v2, v3, VAO, VBO, prec);
v1.x = 0.0;
v1.y = -1.0;
v1.z = 0.0;
v1.r = 0.6;
v1.g = 0.5;
v1.b = 0.3;
v2.x = 1.0;
v2.y = 0.0;
v2.z = 0.0;
v2.r = 0.6;
v2.g = 0.5;
v2.b = 0.3;
v3.x = 0.0;
v3.y = 0.0;
v3.z = -1.0;
v3.r = 0.6;
v3.g = 0.5;
v3.b = 0.3;
subdivide(v1, v2, v3, VAO, VBO, prec);
v1.x = 0.0;
v1.y = -1.0;
v1.z = 0.0;
v1.r = 0.6;
v1.g = 0.5;
v1.b = 0.3;
v2.x = -1.0;
v2.y = 0.0;
v2.z = 0.0;
v2.r = 0.6;
v2.g = 0.5;
v2.b = 0.3;
v3.x = 0.0;
v3.y = 0.0;
v3.z = -1.0;
v3.r = 0.6;
v3.g = 0.5;
v3.b = 0.3;
subdivide(v1, v2, v3, VAO, VBO, prec);
glBufferData(GL_ARRAY_BUFFER, sizeof(triangles) * triangles.size(), &triangles[0], GL_STREAM_DRAW);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(GLfloat), (GLvoid*)0);
glEnableVertexAttribArray(0);
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(GLfloat), (GLvoid*)(3 * sizeof(GLfloat)));
glEnableVertexAttribArray(1);
}