window, texture, model, camera and gui (silly button)

1 files changed, 103 insertions, 0 deletions

diff --git a/prge_camera.c b/prge_camera.c
new file mode 100644
index 0000000..242b33d
--- /dev/null
+++ b/prge_camera.c
@@ -0,0 +1,103 @@
+Camera camera_init(V3 pos, F32 fov, F32 near, F32 far,
+		   F32 yaw, F32 pitch, F32 roll)
+{
+	Camera	c;
+
+	c.pos = pos;
+	c.fov = fov;
+	c.near = near;
+	c.far = far;
+	c.yaw = yaw;
+	c.pitch = pitch;
+	c.roll = roll;
+
+	return c;
+}
+
+MAT4 camera_get_view_matrix_first_person(Camera *c)
+{
+	MAT4	v;
+
+	v = mat4transl(MAT4_IDENTITY, v3inv(c->pos));
+	v = mat4rotate(v, v3(c->pitch, c->yaw, c->roll));
+
+	return v;
+}
+
+void camera_get_vectors_first_person(Camera *c, V3 *r, V3 *u, V3 *f)
+{
+	F32	angle, cp, sp, cy, sy, cr, sr;
+
+	angle = DEG2RAD*c->pitch;
+	cp = f32cos(angle);
+	sp = f32sin(angle);
+	angle = DEG2RAD*c->yaw;
+	cy = f32cos(angle);
+	sy = f32sin(angle);
+	angle = DEG2RAD*c->roll;
+	cr = f32cos(angle);
+	sr = f32sin(angle);
+
+	*r = v3(cy*cr, -cy*sr, sy);
+	*u = v3(sp*sy*cr+cp*sr, -sp*sy*sr+cp*cr, -sp*cy);
+	*f = v3(-cp*sy*cr+sp*sr, cp*sy*sr+sp*cr, cp*cy);
+}
+
+MAT4 camera_look_at(Camera c, V3 t, V3 wup)
+{
+	V3	f, r, u;
+	MAT4	transl, rotate, res;
+
+	f = v3norm(v3sub(c.pos, t));
+	r = v3norm(v3cross(wup, f));
+	u = v3cross(f, r);
+
+	transl = mat4transl(MAT4_IDENTITY, v3inv(c.pos));
+	rotate = mat4transp(mat4_change_basis(r, u, f));
+	res = mat4mul(rotate, transl);
+
+	return res;
+}
+
+MAT4 ortho(F32 l, F32 r, F32 b, F32 t, F32 n, F32 f)
+{
+	MAT4	res;
+
+	res = MAT4_IDENTITY;
+	res.m0.x = 2.0f/(r-l);
+	res.m1.y = 2.0f/(t-b);
+	res.m2.z = -2.0f/(f-n);
+	res.m3.x = -(r+l)/(r-l);
+	res.m3.y = -(t+b)/(t-b);
+	res.m3.z = -(f+n)/(f-n);
+
+	return res;
+}
+
+MAT4 persp(F32 fov, F32 ar, F32 n, F32 f)
+{
+	F32	r, t;
+	MAT4	res;
+
+	r = n*f32tan(fov/2.0f*DEG2RAD);
+	t = r/ar;
+
+	res = MAT4_IDENTITY;
+	res.m0.x = n/r;
+	res.m1.y = n/t;
+	res.m2.z = -(f+n)/(f-n);
+	res.m2.w = -1.0f;
+	res.m3.z = (-2.0f*f*n)/(f-n);
+	res.m3.w = 0.0f;
+
+	return res;
+}
+
+MAT4 camera_persp(Camera c, F32 ar)
+{
+	MAT4	res;
+
+	res = persp(c.fov, ar, c.near, c.far);
+
+	return res;
+}