diff options
Diffstat (limited to 'source/blender/blenlib/intern/math_geom.c')
| -rw-r--r-- | source/blender/blenlib/intern/math_geom.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/source/blender/blenlib/intern/math_geom.c b/source/blender/blenlib/intern/math_geom.c index 7cdac6b1497..3a562778af7 100644 --- a/source/blender/blenlib/intern/math_geom.c +++ b/source/blender/blenlib/intern/math_geom.c @@ -4364,6 +4364,33 @@ void perspective_m4(float mat[4][4], mat[3][3] = 0.0f; } +void perspective_m4_fov(float mat[4][4], + const float angle_left, + const float angle_right, + const float angle_up, + const float angle_down, + const float nearClip, + const float farClip) +{ + const float tan_angle_left = tanf(angle_left); + const float tan_angle_right = tanf(angle_right); + const float tan_angle_up = tanf(angle_up); + const float tan_angle_down = tanf(angle_down); + const float Xdelta = tan_angle_right - tan_angle_left; + const float Ydelta = tan_angle_up - tan_angle_down; + + mat[0][0] = 2 / Xdelta; + mat[1][1] = 2 / Ydelta; + mat[2][0] = (tan_angle_right + tan_angle_left) / Xdelta; + mat[2][1] = (tan_angle_up + tan_angle_down) / Ydelta; + mat[2][2] = -(farClip + nearClip) / (farClip - nearClip); + mat[2][3] = -1; + mat[3][2] = -(farClip * (nearClip + nearClip)) / (farClip - nearClip); + + mat[0][1] = mat[0][2] = mat[0][3] = mat[1][0] = mat[1][2] = mat[1][3] = mat[3][0] = mat[3][1] = + mat[3][3] = 0.0f; +} + /* translate a matrix created by orthographic_m4 or perspective_m4 in XY coords * (used to jitter the view) */ void window_translate_m4(float winmat[4][4], float perspmat[4][4], const float x, const float y) |