spacegame/include/ply.h

#ifndef PLY_H
#define PLY_H

#include <stddef.h>
#include <cglm/types.h>
#include <stdint.h>

typedef enum {
  PLY_FORMAT_INVALID = -1,
  PLY_FORMAT_ASCII = 0,
  PLY_FORMAT_LE = 1,
  PLY_FORMAT_BE = 2,
} PlyFormatType;

typedef enum {
  PLY_HEADER_INVALID = -1,
  PLY_HEADER_COMMENT = 0,
  PLY_HEADER_END = 1,
  PLY_HEADER_ELEMENT = 2,
  PLY_HEADER_PROPERTY = 3,
} PlyHeaderType;

typedef enum {
  PLY_TYPE_INVALID = -1,
  PLY_TYPE_CHAR = 0,
  PLY_TYPE_UCHAR = 1,
  PLY_TYPE_SHORT = 2,
  PLY_TYPE_USHORT = 3,
  PLY_TYPE_INT = 4,
  PLY_TYPE_UINT = 5,
  PLY_TYPE_FLOAT = 6,
  PLY_TYPE_DOUBLE = 7,
} PlyPropertyType;

typedef struct PlyPropertyStruct {
  char* name;
  PlyPropertyType count;
  PlyPropertyType element;

  void* elements;
  void* counts;
  struct PlyPropertyStruct* next;
} PlyProperty;

typedef struct PlyElementStruct {
  char* name;
  int   count;
  PlyProperty* properties;

  struct PlyElementStruct* next;
} PlyElement;

typedef struct PlyMeshStruct {
  uint32_t vertex_count;
  vec3*    position;
  vec4*    colour;
  vec3*    normal;
  vec2*    uv;

  uint32_t  index_count;
  uint16_t* index;
} PlyMesh;

typedef struct PlyMappingsStruct {
  char* vertex_element;
  char* position[3];
  char* normal[3];
  char* colour[4];
  char* texture[2];

  char* face_element;
  char* index;
} PlyMappings;

extern PlyMappings default_ply_mappings;

extern const char* const ply_formats[];
extern const char* const ply_header_items[];
extern const char* const ply_type_strings[];
extern const size_t ply_type_sizes[];

PlyMesh ply_load_mesh(char* filename, PlyMappings mappings);
void ply_free_elements(PlyElement* elements_head);

#endif