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      1 /*
      2  * Copyright (C) 2021 Collabora Ltd.
      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
     21  * DEALINGS IN THE SOFTWARE.
     22  */
     23 
     24 #ifndef PANVK_VARYINGS_H
     25 #define PANVK_VARYINGS_H
     26 
     27 #include "util/bitset.h"
     28 #include "util/format/u_format.h"
     29 
     30 #include "compiler/shader_enums.h"
     31 #include "panfrost-job.h"
     32 
     33 #include "pan_pool.h"
     34 
     35 struct pan_pool;
     36 struct panvk_device;
     37 
     38 enum panvk_varying_buf_id {
     39    PANVK_VARY_BUF_GENERAL,
     40    PANVK_VARY_BUF_POSITION,
     41    PANVK_VARY_BUF_PSIZ,
     42    PANVK_VARY_BUF_PNTCOORD,
     43    PANVK_VARY_BUF_FRAGCOORD,
     44 
     45    /* Keep last */
     46    PANVK_VARY_BUF_MAX,
     47 };
     48 
     49 struct panvk_varying {
     50    unsigned buf;
     51    unsigned offset;
     52    enum pipe_format format;
     53 };
     54 
     55 struct panvk_varying_buf {
     56    mali_ptr address;
     57    void *cpu;
     58    unsigned stride;
     59    unsigned size;
     60 };
     61 
     62 struct panvk_varyings_info {
     63    struct panvk_varying varying[VARYING_SLOT_MAX];
     64    BITSET_DECLARE(active, VARYING_SLOT_MAX);
     65    struct panvk_varying_buf buf[VARYING_SLOT_MAX];
     66    struct {
     67       unsigned count;
     68       gl_varying_slot loc[VARYING_SLOT_MAX];
     69    } stage[MESA_SHADER_STAGES];
     70    unsigned buf_mask;
     71 };
     72 
     73 static inline unsigned
     74 panvk_varying_buf_index(const struct panvk_varyings_info *varyings,
     75                         enum panvk_varying_buf_id b)
     76 {
     77    return util_bitcount(varyings->buf_mask & BITFIELD_MASK(b));
     78 }
     79 
     80 static inline enum panvk_varying_buf_id
     81 panvk_varying_buf_id(bool fs, gl_varying_slot loc)
     82 {
     83    switch (loc) {
     84    case VARYING_SLOT_POS:
     85       return fs ? PANVK_VARY_BUF_FRAGCOORD : PANVK_VARY_BUF_POSITION;
     86    case VARYING_SLOT_PSIZ:
     87       return PANVK_VARY_BUF_PSIZ;
     88    case VARYING_SLOT_PNTC:
     89       return PANVK_VARY_BUF_PNTCOORD;
     90    default:
     91       return PANVK_VARY_BUF_GENERAL;
     92    }
     93 }
     94 
     95 static inline bool
     96 panvk_varying_is_builtin(gl_shader_stage stage, gl_varying_slot loc)
     97 {
     98    bool fs = stage == MESA_SHADER_FRAGMENT;
     99 
    100    switch (loc) {
    101    case VARYING_SLOT_POS:
    102    case VARYING_SLOT_PNTC:
    103       return fs;
    104    default:
    105       return false;
    106    }
    107 }
    108 
    109 #if defined(PAN_ARCH) && PAN_ARCH <= 5
    110 static inline enum mali_attribute_special
    111 panvk_varying_special_buf_id(enum panvk_varying_buf_id buf_id)
    112 {
    113    switch (buf_id) {
    114    case PANVK_VARY_BUF_PNTCOORD:
    115       return MALI_ATTRIBUTE_SPECIAL_POINT_COORD;
    116    case PANVK_VARY_BUF_FRAGCOORD:
    117       return MALI_ATTRIBUTE_SPECIAL_FRAG_COORD;
    118    default:
    119       return 0;
    120    }
    121 }
    122 #endif
    123 
    124 static inline unsigned
    125 panvk_varying_size(const struct panvk_varyings_info *varyings,
    126                    gl_varying_slot loc)
    127 {
    128    switch (loc) {
    129    case VARYING_SLOT_POS:
    130       return sizeof(float) * 4;
    131    case VARYING_SLOT_PSIZ:
    132       return sizeof(uint16_t);
    133    default:
    134       return util_format_get_blocksize(varyings->varying[loc].format);
    135    }
    136 }
    137 
    138 #ifdef PAN_ARCH
    139 static inline unsigned
    140 panvk_varyings_buf_count(struct panvk_varyings_info *varyings)
    141 {
    142    return util_bitcount(varyings->buf_mask) + (PAN_ARCH >= 6 ? 1 : 0);
    143 }
    144 #endif
    145 
    146 static inline void
    147 panvk_varyings_alloc(struct panvk_varyings_info *varyings,
    148                      struct pan_pool *varying_mem_pool,
    149                      unsigned vertex_count)
    150 {
    151    for (unsigned i = 0; i < PANVK_VARY_BUF_MAX; i++) {
    152       if (!(varyings->buf_mask & (1 << i))) continue;
    153 
    154       unsigned buf_idx = panvk_varying_buf_index(varyings, i);
    155       unsigned size = varyings->buf[buf_idx].stride * vertex_count;
    156       if (!size)
    157          continue;
    158 
    159       struct panfrost_ptr ptr =
    160          pan_pool_alloc_aligned(varying_mem_pool, size, 64);
    161 
    162       varyings->buf[buf_idx].size = size;
    163       varyings->buf[buf_idx].address = ptr.gpu;
    164       varyings->buf[buf_idx].cpu = ptr.cpu;
    165    }
    166 }
    167 
    168 #endif
    169