Branch
Hash :
c595178c
Author :
Thomas de Grivel
Date :
2025-09-30T16:28:44
port OpenGL 4.1 to OpenGLES v2, works on OpenBSD
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/* kc3
* Copyright from 2022 to 2025 kmx.io <contact@kmx.io>
*
* Permission is hereby granted to use this software granted the above
* copyright notice and this permission paragraph are included in all
* copies and substantial portions of this software.
*
* THIS SOFTWARE IS PROVIDED "AS-IS" WITHOUT ANY GUARANTEE OF
* PURPOSE AND PERFORMANCE. IN NO EVENT WHATSOEVER SHALL THE
* AUTHOR BE CONSIDERED LIABLE FOR THE USE AND PERFORMANCE OF
* THIS SOFTWARE.
*/
#include <math.h>
#include "../libkc3/kc3.h"
#include "vec3.h"
s_vec3 * vec3_init (s_vec3 *p, f32 x, f32 y, f32 z)
{
assert(p);
p->x = x;
p->y = y;
p->z = z;
return p;
}
s_vec3 * vec3_init_copy (s_vec3 *p, const s_vec3 *src)
{
assert(p);
assert(src);
p->x = src->x;
p->y = src->y;
p->z = src->z;
return p;
}
s_vec3 * vec3_init_normalize (s_vec3 *p, const s_vec3 *src)
{
f32 norm;
f32 ratio;
assert(p);
assert(src);
norm = vec3_norm(src);
ratio = 1.0f / norm;
p->x = src->x * ratio;
p->y = src->y * ratio;
p->z = src->z * ratio;
return p;
}
s_vec3 * vec3_init_zero (s_vec3 *p)
{
assert(p);
p->x = 0.0;
p->y = 0.0;
p->z = 0.0;
return p;
}
s_vec3 * vec3_interpolate (const s_vec3 *a, const s_vec3 *b, f32 t,
s_vec3 *dest)
{
dest->x = (b->x - a->x) * t + a->x;
dest->y = (b->y - a->y) * t + a->y;
dest->z = (b->z - a->z) * t + a->z;
return dest;
}
void vec3_delete (s_vec3 *p)
{
free(p);
}
s_vec3 * vec3_new (f32 x, f32 y, f32 z)
{
s_vec3 *p;
p = calloc(1, sizeof(s_vec3));
if (! p) {
err_puts("vec3_new: failed to allocate memory");
return NULL;
}
vec3_init(p, x, y, z);
return p;
}
s_vec3 * vec3_new_copy (const s_vec3 *src)
{
s_vec3 *p;
p = calloc(1, sizeof(s_vec3));
if (! p) {
err_puts("vec3_new: failed to allocate memory");
return NULL;
}
vec3_init_copy(p, src);
return p;
}
s_vec3 * vec3_new_zero (void)
{
s_vec3 *p;
p = calloc(1, sizeof(s_vec3));
if (! p) {
err_puts("vec3_new: failed to allocate memory");
return NULL;
}
vec3_init_zero(p);
return p;
}
f32 vec3_norm (const s_vec3 *p)
{
assert(p);
return sqrtf(p->x * p->x + p->y * p->y + p->z * p->z);
}
void vec3_normalize (s_vec3 *p)
{
f32 norm;
f32 ratio;
assert(p);
norm = vec3_norm(p);
ratio = 1.0f / norm;
p->x *= ratio;
p->y *= ratio;
p->z *= ratio;
}