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Update matrix_4x4_projection

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This commit is contained in:
twinaphex 2016-09-16 18:03:30 +02:00
parent 6002fd9f2a
commit ee4c893c07
2 changed files with 11 additions and 7 deletions
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16
libretro-common/gfx/math/matrix_4x4.c
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@ -160,17 +160,21 @@ void matrix_4x4_translate(math_matrix_4x4 *out, float x,
/*
* Creates a perspective projection matrix.
*/
void matrix_4x4_projection(math_matrix_4x4 *out, float znear,
void matrix_4x4_projection(math_matrix_4x4 *out,
float y_fov,
float aspect,
float znear,
float zfar)
{
float const a = 1.f / tan(y_fov / 2.f);
float delta_z = zfar - znear;
memset(out, 0, sizeof(*out));
MAT_ELEM_4X4(*out, 0, 0) = znear;
MAT_ELEM_4X4(*out, 1, 1) = zfar;
MAT_ELEM_4X4(*out, 2, 2) = (zfar + znear) / delta_z;
MAT_ELEM_4X4(*out, 2, 3) = -2.0f * zfar * znear / delta_z;
MAT_ELEM_4X4(*out, 3, 2) = -1.0f;
MAT_ELEM_4X4(*out, 0, 0) = a / aspect;
MAT_ELEM_4X4(*out, 1, 1) = a;
MAT_ELEM_4X4(*out, 2, 2) = -((zfar + znear) / (zfar - znear));
MAT_ELEM_4X4(*out, 2, 3) = -1.f;
MAT_ELEM_4X4(*out, 3, 2) = -((2.f * zfar * znear) / (zfar - znear));
}
/*

2
libretro-common/include/gfx/math/matrix_4x4.h
View File

@ -52,7 +52,7 @@ void matrix_4x4_multiply(math_matrix_4x4 *out, const math_matrix_4x4 *a, const m
void matrix_4x4_scale(math_matrix_4x4 *out, float x, float y, float z);
void matrix_4x4_translate(math_matrix_4x4 *out, float x, float y, float z);
void matrix_4x4_projection(math_matrix_4x4 *out, float znear, float zfar);
void matrix_4x4_projection(math_matrix_4x4 *out, float y_fov, float aspect, float znear, float zfar);
#endif