src/gallium/drivers/panfrost/pan_fragment.c

   1 /*
   2  * Copyright 2018-2019 Alyssa Rosenzweig
   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 FROM,
  20  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  21  * SOFTWARE.
  22  *
  23  */
  24
  25 #include "pan_context.h"
  26 #include "pan_util.h"
  27 #include "pan_format.h"
  28
  29 #include "util/u_format.h"
  30
  31 /* Mark a surface as written */
  32
  33 static void
  34 panfrost_initialize_surface(struct pipe_surface *surf)
  35 {
  36         unsigned level = surf->u.tex.level;
  37         struct panfrost_resource *rsrc = pan_resource(surf->texture);
  38
  39         rsrc->slices[level].initialized = true;
  40 }
  41
  42 /* Generate a fragment job. This should be called once per frame. (According to
  43  * presentations, this is supposed to correspond to eglSwapBuffers) */
  44
  45 mali_ptr
  46 panfrost_fragment_job(struct panfrost_context *ctx, bool has_draws)
  47 {
  48         mali_ptr framebuffer = ctx->require_sfbd ?
  49                                panfrost_sfbd_fragment(ctx, has_draws) :
  50                                panfrost_mfbd_fragment(ctx, has_draws);
  51
  52         /* Mark the affected buffers as initialized, since we're writing to it */
  53         struct pipe_framebuffer_state *fb = &ctx->pipe_framebuffer;
  54
  55         for (unsigned i = 0; i < fb->nr_cbufs; ++i) {
  56                 panfrost_initialize_surface(fb->cbufs[i]);
  57         }
  58
  59         if (fb->zsbuf)
  60                 panfrost_initialize_surface(fb->zsbuf);
  61
  62         struct mali_job_descriptor_header header = {
  63                 .job_type = JOB_TYPE_FRAGMENT,
  64                 .job_index = 1,
  65 #ifdef __LP64__
  66                 .job_descriptor_size = 1
  67 #endif
  68         };
  69
  70         struct panfrost_job *job = panfrost_get_job_for_fbo(ctx);
  71
  72         /* The passed tile coords can be out of range in some cases, so we need
  73          * to clamp them to the framebuffer size to avoid a TILE_RANGE_FAULT.
  74          * Theoretically we also need to clamp the coordinates positive, but we
  75          * avoid that edge case as all four values are unsigned. Also,
  76          * theoretically we could clamp the minima, but if that has to happen
  77          * the asserts would fail anyway (since the maxima would get clamped
  78          * and then be smaller than the minima). An edge case of sorts occurs
  79          * when no scissors are added to draw, so by default min=~0 and max=0.
  80          * But that can't happen if any actual drawing occurs (beyond a
  81          * wallpaper reload), so this is again irrelevant in practice. */
  82
  83         job->maxx = MIN2(job->maxx, fb->width);
  84         job->maxy = MIN2(job->maxy, fb->height);
  85
  86         /* Rendering region must be at least 1x1; otherwise, there is nothing
  87          * to do and the whole job chain should have been discarded. */
  88
  89         assert(job->maxx > job->minx);
  90         assert(job->maxy > job->miny);
  91
  92         struct mali_payload_fragment payload = {
  93                 .min_tile_coord = MALI_COORDINATE_TO_TILE_MIN(job->minx, job->miny),
  94                 .max_tile_coord = MALI_COORDINATE_TO_TILE_MAX(job->maxx, job->maxy),
  95                 .framebuffer = framebuffer,
  96         };
  97
  98         /* Normally, there should be no padding. However, fragment jobs are
  99          * shared with 64-bit Bifrost systems, and accordingly there is 4-bytes
 100          * of zero padding in between. */
 101
 102         struct panfrost_transfer transfer = panfrost_allocate_transient(ctx, sizeof(header) + sizeof(payload));
 103         memcpy(transfer.cpu, &header, sizeof(header));
 104         memcpy(transfer.cpu + sizeof(header), &payload, sizeof(payload));
 105         return transfer.gpu;
 106 }