collisionshape.h

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// TRAMWAY DRIFT AND DUNGEON EXPLORATION SIMULATOR 2022
// All rights reserved.
 
#ifndef TRAM_SDK_PHYSICS_COLLISIONSHAPE_H
#define TRAM_SDK_PHYSICS_COLLISIONSHAPE_H
 
#include <framework/math.h>
 
namespace tram::Physics {
    
enum Shape : uint32_t {
    SHAPE_SPHERE,
    SHAPE_CYLINDER,
    SHAPE_CAPSULE,
    SHAPE_CONE,
    SHAPE_BOX,
    SHAPE_HULL,
    SHAPE_MESH
};
 
struct CollisionTriangle {
    vec3 p0, p1, p2;
};
 
struct CollisionShape {
    Shape type;
    
    union {
        struct {
            union {
                float radius;
                float radius_x;
                float extent_x;
            };
            
            union {
                float height;
                float extent_y;
            };
            
            union {
                float extent_z;
                float radius_z;
            };
        };
        
        struct {
            vec3* hull_points;
            size_t hull_size;
        };
        
        struct {
            CollisionTriangle* mesh_triangles;
            size_t mesh_size;
        };
    };
    
    static inline CollisionShape Sphere(float radius);
    static inline CollisionShape Cylinder(float radius, float height);
    static inline CollisionShape Capsule(float radius, float height);
    static inline CollisionShape Cone(float radius, float height);
    static inline CollisionShape Box(vec3 dimensions);
    static inline CollisionShape Hull(vec3* points, size_t size);
    static inline CollisionShape Mesh(CollisionTriangle* triangles, size_t size);
};
 
CollisionShape CollisionShape::Sphere(float radius) {
    return {SHAPE_SPHERE, radius, 0.0f, 0.0f};
}
 
CollisionShape CollisionShape::Cylinder(float radius, float height) {
    return {SHAPE_CYLINDER, radius, height, radius};
}
 
CollisionShape CollisionShape::Capsule(float radius, float height) {
    return {SHAPE_CAPSULE, radius, height, 0.0f};
}
 
CollisionShape CollisionShape::Cone(float radius, float height) {
    return {SHAPE_CONE, radius, height, 0.0f};
}
 
CollisionShape CollisionShape::Box(vec3 dimensions) {
    return {SHAPE_BOX, dimensions.x, dimensions.y, dimensions.z};
}
 
CollisionShape CollisionShape::Hull(vec3* points, size_t size) {
    return CollisionShape {.type = SHAPE_HULL, .hull_points = points, .hull_size = size};
}
 
CollisionShape CollisionShape::Mesh(CollisionTriangle* triangles, size_t size) {
    return CollisionShape {.type = SHAPE_MESH, .mesh_triangles = triangles, .mesh_size = size};
}
 
}
 
#endif // TRAM_SDK_PHYSICS_COLLISIONSHAPE_H