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      1 /*
      2  * Copyright  2016 Intel Corporation
      3  *
      4  * Permission is hereby granted, free of charge, to any person obtaining a
      5  * copy of this software and associated documentation files (the "Software"),
      6  * to deal in the Software without restriction, including without limitation
      7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
      8  * and/or sell copies of the Software, and to permit persons to whom the
      9  * Software is furnished to do so, subject to the following conditions:
     10  *
     11  * The above copyright notice and this permission notice (including the next
     12  * paragraph) shall be included in all copies or substantial portions of the
     13  * Software.
     14  *
     15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
     18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
     20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
     21  * IN THE SOFTWARE.
     22  */
     23 #ifndef INTEL_SAMPLE_POSITIONS_H
     24 #define INTEL_SAMPLE_POSITIONS_H
     25 
     26 #include <util/macros.h>
     27 
     28 /*
     29  * This file defines the standard multisample positions used by both GL and
     30  * Vulkan.  These correspond to the Vulkan "standard sample locations".
     31  */
     32 
     33 struct intel_sample_position {
     34    float x;
     35    float y;
     36 };
     37 
     38 extern const struct intel_sample_position intel_sample_positions_1x[];
     39 extern const struct intel_sample_position intel_sample_positions_2x[];
     40 extern const struct intel_sample_position intel_sample_positions_4x[];
     41 extern const struct intel_sample_position intel_sample_positions_8x[];
     42 extern const struct intel_sample_position intel_sample_positions_16x[];
     43 
     44 static inline const struct intel_sample_position *
     45 intel_get_sample_positions(int samples)
     46 {
     47    switch (samples) {
     48    case 1: return intel_sample_positions_1x;
     49    case 2: return intel_sample_positions_2x;
     50    case 4: return intel_sample_positions_4x;
     51    case 8: return intel_sample_positions_8x;
     52    case 16: return intel_sample_positions_16x;
     53    default: unreachable("Invalid sample count");
     54    }
     55 }
     56 
     57 /* Examples:
     58  * in case of GFX_VER < 8:
     59  * INTEL_SAMPLE_POS_ELEM(ms.Sample, info->pSampleLocations, 0); expands to:
     60  *    ms.Sample0XOffset = info->pSampleLocations[0].x;
     61  *    ms.Sample0YOffset = info->pSampleLocations[0].y;
     62  *
     63  * in case of GFX_VER >= 8:
     64  * INTEL_SAMPLE_POS_ELEM(sp._16xSample, info->pSampleLocations, 0); expands to:
     65  *    sp._16xSample0XOffset = info->pSampleLocations[0].x;
     66  *    sp._16xSample0YOffset = info->pSampleLocations[0].y;
     67  */
     68 
     69 #define INTEL_SAMPLE_POS_ELEM(prefix, arr, sample_idx) \
     70 prefix##sample_idx##XOffset = arr[sample_idx].x; \
     71 prefix##sample_idx##YOffset = arr[sample_idx].y;
     72 
     73 #define INTEL_SAMPLE_POS_1X_ARRAY(prefix, arr)\
     74    INTEL_SAMPLE_POS_ELEM(prefix, arr, 0);
     75 
     76 #define INTEL_SAMPLE_POS_2X_ARRAY(prefix, arr) \
     77    INTEL_SAMPLE_POS_ELEM(prefix, arr, 0); \
     78    INTEL_SAMPLE_POS_ELEM(prefix, arr, 1);
     79 
     80 #define INTEL_SAMPLE_POS_4X_ARRAY(prefix, arr) \
     81    INTEL_SAMPLE_POS_ELEM(prefix, arr, 0); \
     82    INTEL_SAMPLE_POS_ELEM(prefix, arr, 1); \
     83    INTEL_SAMPLE_POS_ELEM(prefix, arr, 2); \
     84    INTEL_SAMPLE_POS_ELEM(prefix, arr, 3);
     85 
     86 #define INTEL_SAMPLE_POS_8X_ARRAY(prefix, arr) \
     87    INTEL_SAMPLE_POS_ELEM(prefix, arr, 0); \
     88    INTEL_SAMPLE_POS_ELEM(prefix, arr, 1); \
     89    INTEL_SAMPLE_POS_ELEM(prefix, arr, 2); \
     90    INTEL_SAMPLE_POS_ELEM(prefix, arr, 3); \
     91    INTEL_SAMPLE_POS_ELEM(prefix, arr, 4); \
     92    INTEL_SAMPLE_POS_ELEM(prefix, arr, 5); \
     93    INTEL_SAMPLE_POS_ELEM(prefix, arr, 6); \
     94    INTEL_SAMPLE_POS_ELEM(prefix, arr, 7);
     95 
     96 #define INTEL_SAMPLE_POS_16X_ARRAY(prefix, arr) \
     97    INTEL_SAMPLE_POS_ELEM(prefix, arr, 0); \
     98    INTEL_SAMPLE_POS_ELEM(prefix, arr, 1); \
     99    INTEL_SAMPLE_POS_ELEM(prefix, arr, 2); \
    100    INTEL_SAMPLE_POS_ELEM(prefix, arr, 3); \
    101    INTEL_SAMPLE_POS_ELEM(prefix, arr, 4); \
    102    INTEL_SAMPLE_POS_ELEM(prefix, arr, 5); \
    103    INTEL_SAMPLE_POS_ELEM(prefix, arr, 6); \
    104    INTEL_SAMPLE_POS_ELEM(prefix, arr, 7); \
    105    INTEL_SAMPLE_POS_ELEM(prefix, arr, 8); \
    106    INTEL_SAMPLE_POS_ELEM(prefix, arr, 9); \
    107    INTEL_SAMPLE_POS_ELEM(prefix, arr, 10); \
    108    INTEL_SAMPLE_POS_ELEM(prefix, arr, 11); \
    109    INTEL_SAMPLE_POS_ELEM(prefix, arr, 12); \
    110    INTEL_SAMPLE_POS_ELEM(prefix, arr, 13); \
    111    INTEL_SAMPLE_POS_ELEM(prefix, arr, 14); \
    112    INTEL_SAMPLE_POS_ELEM(prefix, arr, 15);
    113 
    114 #define INTEL_SAMPLE_POS_1X(prefix) \
    115    INTEL_SAMPLE_POS_1X_ARRAY(prefix, intel_sample_positions_1x)
    116 
    117 #define INTEL_SAMPLE_POS_2X(prefix) \
    118    INTEL_SAMPLE_POS_2X_ARRAY(prefix, intel_sample_positions_2x)
    119 
    120 #define INTEL_SAMPLE_POS_4X(prefix) \
    121    INTEL_SAMPLE_POS_4X_ARRAY(prefix, intel_sample_positions_4x)
    122 
    123 #define INTEL_SAMPLE_POS_8X(prefix) \
    124    INTEL_SAMPLE_POS_8X_ARRAY(prefix, intel_sample_positions_8x)
    125 
    126 #define INTEL_SAMPLE_POS_16X(prefix) \
    127    INTEL_SAMPLE_POS_16X_ARRAY(prefix, intel_sample_positions_16x)
    128 
    129 #endif /* INTEL_SAMPLE_POSITIONS_H */
    130