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 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
