mirror of
https://github.com/bailwillharr/engine.git
synced 2024-09-21 13:01:19 +00:00
159 lines
5.4 KiB
C++
159 lines
5.4 KiB
C++
#include "meshgen.hpp"
|
|
|
|
#include "resources/mesh.hpp"
|
|
|
|
#include <glm/gtc/constants.hpp>
|
|
#include <glm/ext.hpp>
|
|
#include <glm/trigonometric.hpp>
|
|
|
|
#include <stdexcept>
|
|
|
|
std::unique_ptr<engine::resources::Mesh> genSphereMesh(engine::GFXDevice* gfx, float r, int detail, bool windInside, bool flipNormals)
|
|
{
|
|
using namespace glm;
|
|
|
|
std::vector<engine::Vertex> vertices{};
|
|
|
|
float angleStep = two_pi<float>() / (float)detail;
|
|
|
|
for (int i = 0; i < detail; i++) {
|
|
// theta goes north-to-south
|
|
float theta = i * angleStep;
|
|
float theta2 = theta + angleStep;
|
|
for (int j = 0; j < detail/2; j++) {
|
|
// phi goes west-to-east
|
|
float phi = j * angleStep;
|
|
float phi2 = phi + angleStep;
|
|
|
|
vec3 top_left{ r * sin(phi) * cos(theta),
|
|
r * cos(phi),
|
|
r * sin(phi) * sin(theta) };
|
|
vec3 bottom_left{ r * sin(phi) * cos(theta2),
|
|
r * cos(phi),
|
|
r * sin(phi) * sin(theta2) };
|
|
vec3 top_right{ r * sin(phi2) * cos(theta),
|
|
r * cos(phi2),
|
|
r * sin(phi2) * sin(theta) };
|
|
vec3 bottom_right{ r * sin(phi2) * cos(theta2),
|
|
r * cos(phi2),
|
|
r * sin(phi2) * sin(theta2) };
|
|
|
|
if (windInside == false) {
|
|
// tris are visible from outside the sphere
|
|
|
|
// triangle 1
|
|
vertices.push_back({ top_left, {}, {0.0f, 0.0f} });
|
|
vertices.push_back({ bottom_left, {}, {0.0f, 1.0f} });
|
|
vertices.push_back({ bottom_right, {}, {1.0f, 1.0f} });
|
|
// triangle 2
|
|
vertices.push_back({ top_right, {}, {1.0f, 0.0f} });
|
|
vertices.push_back({ top_left, {}, {0.0f, 0.0f} });
|
|
vertices.push_back({ bottom_right, {}, {1.0f, 1.0f} });
|
|
|
|
}
|
|
else {
|
|
// tris are visible from inside the sphere
|
|
|
|
// triangle 1
|
|
vertices.push_back({ bottom_right, {}, {1.0f, 1.0f} });
|
|
vertices.push_back({ bottom_left, {}, {0.0f, 1.0f} });
|
|
vertices.push_back({ top_left, {}, {0.0f, 0.0f} });
|
|
|
|
// triangle 2
|
|
vertices.push_back({ bottom_right, {}, {1.0f, 1.0f} });
|
|
vertices.push_back({ top_left, {}, {0.0f, 0.0f} });
|
|
vertices.push_back({ top_right, {}, {1.0f, 0.0f} });
|
|
|
|
}
|
|
|
|
vec3 vector1 = (vertices.end() - 1)->pos - (vertices.end() - 2)->pos;
|
|
vec3 vector2 = (vertices.end() - 2)->pos - (vertices.end() - 3)->pos;
|
|
vec3 norm = normalize(cross(vector2, vector1));
|
|
|
|
// NORMALS HAVE BEEN FIXED
|
|
|
|
if (flipNormals)
|
|
norm = -norm;
|
|
|
|
if (j == (detail / 2) - 1)
|
|
norm = -norm;
|
|
|
|
for (auto it = vertices.end() - 6; it != vertices.end(); it++) {
|
|
it->norm = norm;
|
|
}
|
|
|
|
}
|
|
}
|
|
|
|
return std::make_unique<engine::resources::Mesh>(gfx, vertices);
|
|
}
|
|
|
|
std::unique_ptr<engine::resources::Mesh> genCuboidMesh(engine::GFXDevice* gfx, float x, float y, float z, float tiling, bool windInside)
|
|
{
|
|
|
|
// x goes ->
|
|
// y goes ^
|
|
// z goes into the screen
|
|
|
|
using namespace glm;
|
|
|
|
std::vector<engine::Vertex> v{};
|
|
|
|
// front
|
|
v.push_back({{x, 0.0f, 0.0f}, {0.0f, 0.0f, -1.0f}, {tiling, 0.0f}});
|
|
v.push_back({{0.0f, 0.0f, 0.0f}, {0.0f, 0.0f, -1.0f}, {0.0f, 0.0f}});
|
|
v.push_back({{0.0f, y, 0.0f}, {0.0f, 0.0f, -1.0f}, {0.0f, tiling}});
|
|
v.push_back({{x, 0.0f, 0.0f}, {0.0f, 0.0f, -1.0f}, {tiling, 0.0f}});
|
|
v.push_back({{0.0f, y, 0.0f}, {0.0f, 0.0f, -1.0f}, {0.0f, tiling}});
|
|
v.push_back({{x, y, 0.0f}, {0.0f, 0.0f, -1.0f}, {tiling, tiling}});
|
|
|
|
// back
|
|
v.push_back({{0.0f, 0.0f, z}, {0.0f, 0.0f, 1.0f}, {0.0f, 0.0f}});
|
|
v.push_back({{x, 0.0f, z}, {0.0f, 0.0f, 1.0f}, {tiling, 0.0f}});
|
|
v.push_back({{0.0f, y, z}, {0.0f, 0.0f, 1.0f}, {0.0f, tiling}});
|
|
v.push_back({{x, 0.0f, z}, {0.0f, 0.0f, 1.0f}, {tiling, 0.0f}});
|
|
v.push_back({{x, y, z}, {0.0f, 0.0f, 1.0f}, {tiling, tiling}});
|
|
v.push_back({{0.0f, y, z}, {0.0f, 0.0f, 1.0f}, {0.0f, tiling}});
|
|
|
|
// left
|
|
v.push_back({{0.0f, 0.0f, 0.0f}, {-1.0f, 0.0f, 0.0f}, {0.0f, 0.0f}});
|
|
v.push_back({{0.0f, 0.0f, x}, {-1.0f, 0.0f, 0.0f}, {0.0f, tiling}});
|
|
v.push_back({{0.0f, y, 0.0f}, {-1.0f, 0.0f, 0.0f}, {tiling, 0.0f}});
|
|
v.push_back({{0.0f, 0.0f, x}, {-1.0f, 0.0f, 0.0f}, {0.0f, tiling}});
|
|
v.push_back({{0.0f, y, x}, {-1.0f, 0.0f, 0.0f}, {tiling, tiling}});
|
|
v.push_back({{0.0f, y, 0.0f}, {-1.0f, 0.0f, 0.0f}, {tiling, 0.0f}});
|
|
|
|
// right
|
|
v.push_back({{x, y, 0.0f}, {1.0f, 0.0f, 0.0f}, {tiling, 0.0f}});
|
|
v.push_back({{x, 0.0f, x}, {1.0f, 0.0f, 0.0f}, {0.0f, tiling}});
|
|
v.push_back({{x, 0.0f, 0.0f}, {1.0f, 0.0f, 0.0f}, {0.0f, 0.0f}});
|
|
v.push_back({{x, y, 0.0f}, {1.0f, 0.0f, 0.0f}, {tiling, 0.0f}});
|
|
v.push_back({{x, y, x}, {1.0f, 0.0f, 0.0f}, {tiling, tiling}});
|
|
v.push_back({{x, 0.0f, x}, {1.0f, 0.0f, 0.0f}, {0.0f, tiling}});
|
|
|
|
// bottom
|
|
v.push_back({{0.0f, 0.0f, z}, {0.0f, -1.0f, 0.0f}, {0.0f, tiling}});
|
|
v.push_back({{0.0f, 0.0f, 0.0f}, {0.0f, -1.0f, 0.0f}, {0.0f, 0.0f}});
|
|
v.push_back({{x, 0.0f, 0.0f}, {0.0f, -1.0f, 0.0f}, {tiling, 0.0f}});
|
|
v.push_back({{x, 0.0f, z}, {0.0f, -1.0f, 0.0f}, {tiling, tiling}});
|
|
v.push_back({{0.0f, 0.0f, z}, {0.0f, -1.0f, 0.0f}, {0.0f, tiling}});
|
|
v.push_back({{x, 0.0f, 0.0f}, {0.0f, -1.0f, 0.0f}, {tiling, 0.0f}});
|
|
|
|
// top
|
|
v.push_back({{x, y, 0.0f}, {0.0f, 1.0f, 0.0f}, {tiling, 0.0f}});
|
|
v.push_back({{0.0f, y, 0.0f}, {0.0f, 1.0f, 0.0f}, {0.0f, 0.0f}});
|
|
v.push_back({{0.0f, y, z}, {0.0f, 1.0f, 0.0f}, {0.0f, tiling}});
|
|
v.push_back({{x, y, 0.0f}, {0.0f, 1.0f, 0.0f}, {tiling, 0.0f}});
|
|
v.push_back({{0.0f, y, z}, {0.0f, 1.0f, 0.0f}, {0.0f, tiling}});
|
|
v.push_back({{x, y, z}, {0.0f, 1.0f, 0.0f}, {tiling, tiling}});
|
|
|
|
if (windInside) {
|
|
for (size_t i = 0; i < v.size(); i += 3) {
|
|
std::swap(v[i], v[i + 2]);
|
|
}
|
|
}
|
|
|
|
return std::make_unique<engine::resources::Mesh>(gfx, v);
|
|
|
|
}
|