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vec3 and vec4 sign helper

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This commit is contained in:
Recep Aslantas
2018-04-07 21:53:22 +03:00
parent 257c57d41f
commit 12c5307447
2 changed files with 45 additions and 1 deletions
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16
include/cglm/vec3-ext.h
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@@ -26,6 +26,7 @@
#define cglm_vec3_ext_h
#include "common.h"
#include "util.h"
#include <stdbool.h>
#include <math.h>
#include <float.h>
@@ -196,4 +197,19 @@ glm_vec_isvalid(vec3 v) {
return !glm_vec_isnan(v) && !glm_vec_isinf(v);
}
/*!
* @brief get sign of 32 bit float as +1, -1, 0
*
* Important: It returns 0 for zero/NaN input
*
* @param v vector
*/
CGLM_INLINE
void
glm_vec_sign(vec3 v, vec3 dest) {
dest[0] = glm_signf(v[0]);
dest[1] = glm_signf(v[1]);
dest[2] = glm_signf(v[2]);
}
#endif /* cglm_vec3_ext_h */

30
include/cglm/vec4-ext.h
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@@ -210,5 +210,33 @@ glm_vec4_isvalid(vec4 v) {
return !glm_vec4_isnan(v) && !glm_vec4_isinf(v);
}
#endif /* cglm_vec4_ext_h */
/*!
* @brief get sign of 32 bit float as +1, -1, 0
*
* Important: It returns 0 for zero/NaN input
*
* @param v vector
*/
CGLM_INLINE
void
glm_vec4_sign(vec4 v, vec4 dest) {
#if defined( __SSE2__ ) || defined( __SSE2__ )
__m128 x0, x1, x2, x3, x4;
x0 = _mm_load_ps(v);
x1 = _mm_set_ps(0.0f, 0.0f, 1.0f, -1.0f);
x2 = _mm_shuffle1_ps1(x1, 2);
x3 = _mm_and_ps(_mm_cmpgt_ps(x0, x2), _mm_shuffle1_ps1(x1, 1));
x4 = _mm_and_ps(_mm_cmplt_ps(x0, x2), _mm_shuffle1_ps1(x1, 0));
_mm_store_ps(dest, _mm_or_ps(x3, x4));
#else
dest[0] = glm_signf(v[0]);
dest[1] = glm_signf(v[1]);
dest[2] = glm_signf(v[2]);
dest[3] = glm_signf(v[3]);
#endif
}
#endif /* cglm_vec4_ext_h */