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