/*
 * Copyright 2010 Red Hat Inc.
 * Authors: Dave Airlie
 * SPDX-License-Identifier: MIT
 */

#include <stdio.h>

#include "util/u_inlines.h"
#include "util/u_memory.h"
#include "util/u_upload_mgr.h"
#include "util/u_math.h"

#include "r300_screen_buffer.h"

void r300_upload_index_buffer(struct r300_context *r300,
			      struct pipe_resource **index_buffer,
			      unsigned index_size, unsigned *start,
			      unsigned count, const uint8_t *ptr)
{
    unsigned index_offset;

    *index_buffer = NULL;

    u_upload_data(r300->uploader,
                  0, count * index_size, 4,
                  ptr + (*start * index_size),
                  &index_offset,
                  index_buffer);

    *start = index_offset / index_size;
}

void r300_resource_destroy(struct pipe_screen *screen,
                           struct pipe_resource *buf)
{
   struct r300_screen *rscreen = r300_screen(screen);

   if (buf->target == PIPE_BUFFER) {
      struct r300_resource *rbuf = r300_resource(buf);

      align_free(rbuf->malloced_buffer);

      if (rbuf->buf)
         radeon_bo_reference(rscreen->rws, &rbuf->buf, NULL);

      FREE(rbuf);
   } else {
      struct r300_resource* tex = (struct r300_resource*)buf;

      if (tex->tex.cmask_dwords) {
          mtx_lock(&rscreen->cmask_mutex);
          if (buf == rscreen->cmask_resource) {
              rscreen->cmask_resource = NULL;
          }
          mtx_unlock(&rscreen->cmask_mutex);
      }
      radeon_bo_reference(rscreen->rws, &tex->buf, NULL);
      FREE(tex);
   }
}

void *
r300_buffer_transfer_map( struct pipe_context *context,
                          struct pipe_resource *resource,
                          unsigned level,
                          unsigned usage,
                          const struct pipe_box *box,
                          struct pipe_transfer **ptransfer )
{
    struct r300_context *r300 = r300_context(context);
    struct radeon_winsys *rws = r300->screen->rws;
    struct r300_resource *rbuf = r300_resource(resource);
    struct pipe_transfer *transfer;
    uint8_t *map;

    transfer = slab_alloc(&r300->pool_transfers);
    transfer->resource = resource;
    transfer->level = level;
    transfer->usage = usage;
    transfer->box = *box;
    transfer->stride = 0;
    transfer->layer_stride = 0;

    if (rbuf->malloced_buffer) {
        *ptransfer = transfer;
        return rbuf->malloced_buffer + box->x;
    }

    if (usage & PIPE_MAP_DISCARD_WHOLE_RESOURCE &&
        !(usage & PIPE_MAP_UNSYNCHRONIZED)) {
        assert(usage & PIPE_MAP_WRITE);

        /* Check if mapping this buffer would cause waiting for the GPU. */
        if (r300->rws->cs_is_buffer_referenced(&r300->cs, rbuf->buf, RADEON_USAGE_READWRITE) ||
            !r300->rws->buffer_wait(r300->rws, rbuf->buf, 0, RADEON_USAGE_READWRITE)) {
            unsigned i;
            struct pb_buffer_lean *new_buf;

            /* Create a new one in the same pipe_resource. */
            new_buf = r300->rws->buffer_create(r300->rws, rbuf->b.width0,
                                               R300_BUFFER_ALIGNMENT,
                                               rbuf->domain,
                                               RADEON_FLAG_NO_INTERPROCESS_SHARING);
            if (new_buf) {
                /* Discard the old buffer. */
                radeon_bo_reference(r300->rws, &rbuf->buf, NULL);
                rbuf->buf = new_buf;

                /* We changed the buffer, now we need to bind it where the old one was bound. */
                for (i = 0; i < r300->nr_vertex_buffers; i++) {
                    if (r300->vertex_buffer[i].buffer.resource == &rbuf->b) {
                        r300->vertex_arrays_dirty = true;
                        break;
                    }
                }
            }
        }
    }

    /* Buffers are never used for write, therefore mapping for read can be
     * unsynchronized. */
    if (!(usage & PIPE_MAP_WRITE)) {
       usage |= PIPE_MAP_UNSYNCHRONIZED;
    }

    map = rws->buffer_map(rws, rbuf->buf, &r300->cs, usage);

    if (!map) {
        slab_free(&r300->pool_transfers, transfer);
        return NULL;
    }

    *ptransfer = transfer;
    return map + box->x;
}

void r300_buffer_transfer_unmap( struct pipe_context *pipe,
                                 struct pipe_transfer *transfer )
{
    struct r300_context *r300 = r300_context(pipe);

    slab_free(&r300->pool_transfers, transfer);
}

struct pipe_resource *r300_buffer_create(struct pipe_screen *screen,
					 const struct pipe_resource *templ)
{
    struct r300_screen *r300screen = r300_screen(screen);
    struct r300_resource *rbuf;

    rbuf = MALLOC_STRUCT(r300_resource);

    rbuf->b = *templ;
    pipe_reference_init(&rbuf->b.reference, 1);
    rbuf->b.screen = screen;
    rbuf->domain = RADEON_DOMAIN_GTT;
    rbuf->buf = NULL;
    rbuf->malloced_buffer = NULL;

    /* Allocate constant buffers and SWTCL vertex and index buffers in RAM.
     * Note that uploaded index buffers use the flag PIPE_BIND_CUSTOM, so that
     * we can distinguish them from user-created buffers.
     */
    if (templ->bind & PIPE_BIND_CONSTANT_BUFFER ||
        (!r300screen->caps.has_tcl && !(templ->bind & PIPE_BIND_CUSTOM))) {
        rbuf->malloced_buffer = align_malloc(templ->width0, 64);
        return &rbuf->b;
    }

    rbuf->buf =
        r300screen->rws->buffer_create(r300screen->rws, rbuf->b.width0,
                                       R300_BUFFER_ALIGNMENT,
                                       rbuf->domain,
                                       RADEON_FLAG_NO_INTERPROCESS_SHARING);
    if (!rbuf->buf) {
        FREE(rbuf);
        return NULL;
    }
    return &rbuf->b;
}