icosphere.c File Reference

#include "icosphere.h"
#include <cglm/types.h>
#include <cglm/vec3.h>
#include <stdint.h>
#include <stdlib.h>

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Data Structures
struct	EdgeEntry
struct	EdgeHash

Macros
#define	X   0.525731112119133606F
#define	Z   0.850650808352039932F

Enumerations
enum	{   INITIAL_VEC3_CAPACITY = 128 , INITIAL_UINT_CAPACITY = 256 , ICOSAHEDRON_VERTEX_COUNT = 12 , ICOSAHEDRON_INDEX_COUNT = 60 ,   INDEX_SHIFT = 32 }

Functions
void	vec3array_init (Vec3Array *array)
	Initializes a Vec3Array with zeroed fields. More...
void	vec3array_push (Vec3Array *array, vec3 vertex)
	Appends a vec3 to the array, reallocating if necessary. More...
void	vec3array_free (Vec3Array *array)
	Frees the internal buffer of a Vec3Array. More...
void	uintarray_init (UintArray *array)
	Initializes a UintArray with zeroed fields. More...
void	uintarray_push (UintArray *array, unsigned int value)
	Appends an unsigned int to the array, reallocating if necessary. More...
void	uintarray_free (UintArray *array)
	Frees the internal buffer of a UintArray. More...
static void	normalize_vec3 (vec3 vertex, vec3 out)
static void	edge_hash_init (EdgeHash *hash, size_t capacity)
static void	edge_hash_free (EdgeHash *hash)
static unsigned int	get_midpoint (unsigned int point1, unsigned int point2, Vec3Array *vertices, EdgeHash *hash)
static void	subdivide (Vec3Array *vertices, UintArray *indices, int depth)
static void	compute_normals (const Vec3Array *vertices, Vec3Array *normals)
void	icosphere_init (IcosphereGeometry *geom)
	Initializes icosphere geometry buffers. More...
void	icosphere_generate (IcosphereGeometry *geom, int subdivisions)
	Generates icosphere mesh data for a specified subdivision level. More...
void	icosphere_free (IcosphereGeometry *geom)
	Frees all dynamic memory in the icosphere container. More...

Variables
static const vec3	icosahedron_vertices [ICOSAHEDRON_VERTEX_COUNT]
static const unsigned int	icosahedron_indices [ICOSAHEDRON_INDEX_COUNT]

Macro Definition Documentation

X

#define X   0.525731112119133606F

Z

#define Z   0.850650808352039932F

Enumeration Type Documentation

anonymous enum

anonymous enum

Enumerator
INITIAL_VEC3_CAPACITY
INITIAL_UINT_CAPACITY
ICOSAHEDRON_VERTEX_COUNT
ICOSAHEDRON_INDEX_COUNT
INDEX_SHIFT

Function Documentation

compute_normals()

static void compute_normals ( const Vec3Array *  vertices, Vec3Array *  normals  )

static

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edge_hash_free()

static void edge_hash_free ( EdgeHash *  hash )

static

edge_hash_init()

static void edge_hash_init ( EdgeHash *  hash, size_t  capacity  )

static

get_midpoint()

static unsigned int get_midpoint ( unsigned int  point1, unsigned int  point2, Vec3Array *  vertices, EdgeHash *  hash  )

static

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icosphere_free()

void icosphere_free

(

IcosphereGeometry *

geom

)

Frees all dynamic memory in the icosphere container.

Parameters

geom	Pointer to the geometry container.

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icosphere_generate()

void icosphere_generate	(	IcosphereGeometry *	geom,
		int	subdivisions
	)

Generates icosphere mesh data for a specified subdivision level.

Parameters

geom	Pointer to the geometry container.
subdivisions	Number of times to split each triangle face (0-6).

See also

app_settings.h (MAX_SUBDIV)

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icosphere_init()

void icosphere_init

(

IcosphereGeometry *

geom

)

Initializes icosphere geometry buffers.

Parameters

geom	Pointer to the geometry container.

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normalize_vec3()

static void normalize_vec3 ( vec3  vertex, vec3  out  )

static

subdivide()

static void subdivide ( Vec3Array *  vertices, UintArray *  indices, int  depth  )

static

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uintarray_free()

void uintarray_free

(

UintArray *

array

)

Frees the internal buffer of a UintArray.

uintarray_init()

void uintarray_init

(

UintArray *

array

)

Initializes a UintArray with zeroed fields.

uintarray_push()

void uintarray_push	(	UintArray *	array,
		unsigned int	value
	)

Appends an unsigned int to the array, reallocating if necessary.

vec3array_free()

void vec3array_free

(

Vec3Array *

array

)

Frees the internal buffer of a Vec3Array.

vec3array_init()

void vec3array_init

(

Vec3Array *

array

)

Initializes a Vec3Array with zeroed fields.

vec3array_push()

void vec3array_push	(	Vec3Array *	array,
		vec3	vertex
	)

Appends a vec3 to the array, reallocating if necessary.

Variable Documentation

icosahedron_indices

const unsigned int icosahedron_indices[ICOSAHEDRON_INDEX_COUNT]

static

Initial value:

= {
    0,  4, 1, 0, 9, 4, 9, 5,  4, 4, 5,  8,  4,  8, 1, 8,  10, 1,  8, 3,
    10, 5, 3, 8, 5, 2, 3, 2,  7, 3, 7,  10, 3,  7, 6, 10, 7,  11, 6, 11,
    0,  6, 0, 1, 6, 6, 1, 10, 9, 0, 11, 9,  11, 2, 9, 2,  5,  7,  2, 11}

icosahedron_vertices

const vec3 icosahedron_vertices[ICOSAHEDRON_VERTEX_COUNT]

static

Initial value:

= {
    {- 0.525731112119133606F , 0,  0.850650808352039932F }, { 0.525731112119133606F , 0,  0.850650808352039932F },   {- 0.525731112119133606F , 0, - 0.850650808352039932F }, { 0.525731112119133606F , 0, - 0.850650808352039932F }, {0,  0.850650808352039932F ,  0.525731112119133606F },  {0,  0.850650808352039932F , - 0.525731112119133606F },
    {0, - 0.850650808352039932F ,  0.525731112119133606F }, {0, - 0.850650808352039932F , - 0.525731112119133606F }, { 0.850650808352039932F ,  0.525731112119133606F , 0},   {- 0.850650808352039932F ,  0.525731112119133606F , 0}, { 0.850650808352039932F , - 0.525731112119133606F , 0}, {- 0.850650808352039932F , - 0.525731112119133606F , 0}}