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[vulkan] Add tan and cos perspective projection

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The tan and cos versions allow specifying the fov directly from the tan
or cos of the half angle, useful for dealing with lights.
This commit is contained in:
Bill Currie 2021-04-29 19:27:01 +09:00
parent cb7d2671d8
commit 562f3c2fe2
2 changed files with 18 additions and 2 deletions
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2
include/QF/Vulkan/projection.h
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@ -5,6 +5,8 @@
void QFV_Orthographic (mat4f_t proj, float xmin, float xmax,
float ymin, float ymax, float znear, float zfar);
void QFV_PerspectiveTan (mat4f_t proj, float fov, float aspect);
void QFV_PerspectiveCos (mat4f_t proj, float fov, float aspect);
void QFV_Perspective (mat4f_t proj, float fov, float aspect);
#endif//__QF_Vulkan_projection_h

18
libs/video/renderer/vulkan/projection.c
View file

@ -68,9 +68,9 @@ QFV_Orthographic (mat4f_t proj, float xmin, float xmax, float ymin, float ymax,
}
void
QFV_Perspective (mat4f_t proj, float fov, float aspect)
QFV_PerspectiveTan (mat4f_t proj, float fov, float aspect)
{
float f = 1 / tan (fov * M_PI / 360);
float f = 1 / fov;
float neard, fard;
neard = r_nearclip->value;
@ -81,3 +81,17 @@ QFV_Perspective (mat4f_t proj, float fov, float aspect)
proj[2] = (vec4f_t) { 0, 0, fard / (neard - fard), -1 };
proj[3] = (vec4f_t) { 0, 0, (neard * fard) / (neard - fard), 0 };
}
void
QFV_PerspectiveCos (mat4f_t proj, float fov, float aspect)
{
// square first for auto-abs (no support for > 180 degree fov)
fov = fov * fov;
QFV_PerspectiveTan (proj, sqrt ((1 - fov) / fov), aspect);
}
void
QFV_Perspective (mat4f_t proj, float fov, float aspect)
{
QFV_PerspectiveTan (proj, tan (fov * M_PI / 360), aspect);
}