1 /**************************************************************************
2 *
3 * Copyright 2016 Ilia Mirkin.
4 * All Rights Reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
13 *
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
16 * of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
21 * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
22 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
23 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
24 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25 *
26 **************************************************************************/
27
28 #ifndef U_VIEWPORT_H
29 #define U_VIEWPORT_H
30
31 #include "c99_compat.h"
32 #include "pipe/p_state.h"
33
34 #ifdef __cplusplus
35 extern "C" {
36 #endif
37
38 static inline void
util_viewport_zmin_zmax(const struct pipe_viewport_state * vp,bool halfz,float * zmin,float * zmax)39 util_viewport_zmin_zmax(const struct pipe_viewport_state *vp, bool halfz,
40 float *zmin, float *zmax)
41 {
42 float a, b;
43 if (halfz) {
44 a = vp->translate[2];
45 b = vp->translate[2] + vp->scale[2];
46 } else {
47 a = vp->translate[2] - vp->scale[2];
48 b = vp->translate[2] + vp->scale[2];
49 }
50
51 *zmin = a < b ? a : b;
52 *zmax = a < b ? b : a;
53 }
54
55 #ifdef __cplusplus
56 }
57 #endif
58
59 #endif
60