gobjects.hpp

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/*
 * COPYRIGHT (c) 2024 John Reppy (https://cs.uchicago.edu/~jhr)
 * All rights reserved.
 */
 
#ifndef _CS237_GOBJECTS_HPP_
#define _CS237_GOBJECTS_HPP_
 
#ifndef _CS237_HPP_
#error "cs237/gobjects.hpp should not be included directly"
#endif
 
namespace OBJ {
    struct Group;
}
 
namespace cs237 {
namespace gobj {
 
constexpr uint32_t kVAttrPosBit = (1 << 0);     
constexpr uint32_t kVAttrNormBit = (1 << 1);    
constexpr uint32_t kVAttrTCBit = (1 << 2);      
constexpr uint32_t kVAttrTanBit = (1 << 3);     
 
 
//
enum class VertexAttrs : uint32_t {
    ePos = kVAttrPosBit,                                
    ePosNorm = kVAttrPosBit | kVAttrNormBit,            
    ePosTex = kVAttrPosBit | kVAttrTCBit,               
    ePosNormTex = kVAttrPosBit | kVAttrNormBit | kVAttrTCBit 
};
 
inline bool hasNormals (VertexAttrs attrs)
{
    return ((static_cast<uint32_t>(attrs) & kVAttrNormBit) != 0);
}
 
inline bool hasTextureCoords (VertexAttrs attrs)
{
    return ((static_cast<uint32_t>(attrs) & kVAttrTCBit) != 0);
}
 
struct Obj {
    std::string name;           
    uint32_t nVerts;            
    uint32_t nIndices;          
    glm::vec3 *verts;           
    glm::vec3 *norms;           
    glm::vec2 *txtCoords;       
    uint32_t *indices;          
 
    Obj ()
    : nVerts(0), nIndices(0),
      verts(nullptr), norms(nullptr), txtCoords(nullptr),
      indices(nullptr)
    { }
 
    Obj (Obj &) = delete;
    Obj (Obj const &) = delete;
    Obj (Obj &&) = delete;
 
    Obj (std::string_view s)
    : name(std::string(s)), nVerts(0), nIndices(0),
      verts(nullptr), norms(nullptr), txtCoords(nullptr),
      indices(nullptr)
    { }
 
    Obj (std::string_view s, uint32_t nv, uint32_t ni)
    : name(std::string(s)), nVerts(nv), nIndices(ni),
      verts(new glm::vec3[nv]), norms(nullptr), txtCoords(nullptr),
      indices(new uint32_t[ni])
    { }
 
    ~Obj ()
    {
        if (this->verts != nullptr) { delete [] this->verts; }
        if (this->norms != nullptr) { delete [] this->norms; }
        if (this->txtCoords != nullptr) { delete [] this->txtCoords; }
        if (this->indices != nullptr) { delete [] this->indices; }
    }
};
 
Obj *cube (VertexAttrs attrs, glm::vec3 center, float width);
 
Obj *sphere (
    VertexAttrs attrs,
    glm::vec3 center,
    float radius,
    uint32_t slices,
    uint32_t stacks);
 
Obj *cone (
    VertexAttrs attrs,
    glm::vec3 pos,
    glm::vec3 dir,
    float radius,
    float height,
    uint32_t slices,
    uint32_t stacks);
 
} // namespace gobj
} // namespace cs237
 
#endif // !_CS237_GOBJECTS_HPP_