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Create unfinished version of matrix_4x4_lookat

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This commit is contained in:
twinaphex 2016-09-16 18:27:00 +02:00
parent ee4c893c07
commit eac7bcf38f
1 changed files with 42 additions and 2 deletions
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44
libretro-common/gfx/math/matrix_4x4.c
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@ -24,6 +24,7 @@
#include <math.h> #include <math.h>
#include <gfx/math/matrix_4x4.h> #include <gfx/math/matrix_4x4.h>
#include <gfx/math/vector_3.h>
void matrix_4x4_copy(math_matrix_4x4 *dst, const math_matrix_4x4 *src) void matrix_4x4_copy(math_matrix_4x4 *dst, const math_matrix_4x4 *src)
{ {
@ -172,9 +173,48 @@ void matrix_4x4_projection(math_matrix_4x4 *out,
memset(out, 0, sizeof(*out)); memset(out, 0, sizeof(*out));
MAT_ELEM_4X4(*out, 0, 0) = a / aspect; MAT_ELEM_4X4(*out, 0, 0) = a / aspect;
MAT_ELEM_4X4(*out, 1, 1) = a; MAT_ELEM_4X4(*out, 1, 1) = a;
MAT_ELEM_4X4(*out, 2, 2) = -((zfar + znear) / (zfar - znear)); MAT_ELEM_4X4(*out, 2, 2) = -((zfar + znear) / delta_z);
MAT_ELEM_4X4(*out, 2, 3) = -1.f; MAT_ELEM_4X4(*out, 2, 3) = -1.f;
MAT_ELEM_4X4(*out, 3, 2) = -((2.f * zfar * znear) / (zfar - znear)); MAT_ELEM_4X4(*out, 3, 2) = -((2.f * zfar * znear) / delta_z);
}
/* TODO/FIXME - finish */
void matrix_4x4_lookat(math_matrix_4x4 *out,
vec3_t eye,
vec3_t center,
vec3_t up)
{
vec3_t s, t, f;
vec3_copy(&f[0], center);
vec3_subtract(&f[0], eye);
vec3_normalize(&f[0]);
vec3_cross(&s[0], &f[0], up);
vec3_normalize(&s[0]);
vec3_cross(&t[0], &s[0], f);
memset(out, 0, sizeof(*out));
MAT_ELEM_4X4(*out, 0, 0) = s[0];
MAT_ELEM_4X4(*out, 0, 1) = t[0];
MAT_ELEM_4X4(*out, 0, 2) = -f[0];
MAT_ELEM_4X4(*out, 1, 0) = s[1];
MAT_ELEM_4X4(*out, 1, 1) = t[1];
MAT_ELEM_4X4(*out, 1, 2) = -f[1];
MAT_ELEM_4X4(*out, 2, 0) = s[2];
MAT_ELEM_4X4(*out, 2, 1) = t[2];
MAT_ELEM_4X4(*out, 2, 2) = -f[2];
MAT_ELEM_4X4(*out, 3, 3) = 1.f;
#if 0
mat4x4_translate_in_place(m, -eye[0], -eye[1], -eye[2]);
#endif
} }
/* /*