/*
 * Copyright (C) 2012 Rob Clark <robclark@freedesktop.org>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 * Authors:
 *    Rob Clark <robclark@freedesktop.org>
 */

#include "pipe/p_state.h"
#include "util/u_inlines.h"
#include "util/u_memory.h"
#include "util/u_string.h"

#include "freedreno_context.h"
#include "freedreno_resource.h"
#include "freedreno_texture.h"
#include "freedreno_util.h"

static void
fd_sampler_state_delete(struct pipe_context *pctx, void *hwcso)
{
   FREE(hwcso);
}

static void
fd_sampler_view_destroy(struct pipe_context *pctx,
                        struct pipe_sampler_view *view)
{
   pipe_resource_reference(&view->texture, NULL);
   FREE(view);
}

static void
bind_sampler_states(struct fd_texture_stateobj *tex, unsigned start,
                    unsigned nr, void **hwcso)
{
   unsigned i;

   for (i = 0; i < nr; i++) {
      unsigned p = i + start;
      tex->samplers[p] = hwcso ? hwcso[i] : NULL;
      if (tex->samplers[p])
         tex->valid_samplers |= (1 << p);
      else
         tex->valid_samplers &= ~(1 << p);
   }

   tex->num_samplers = util_last_bit(tex->valid_samplers);
}

static void
set_sampler_views(struct fd_texture_stateobj *tex, unsigned start, unsigned nr,
                  unsigned unbind_num_trailing_slots, bool take_ownership,
                  struct pipe_sampler_view **views)
{
   unsigned i;

   for (i = 0; i < nr; i++) {
      struct pipe_sampler_view *view = views ? views[i] : NULL;
      unsigned p = i + start;

      if (take_ownership) {
         pipe_sampler_view_reference(&tex->textures[p], NULL);
         tex->textures[p] = view;
      } else {
         pipe_sampler_view_reference(&tex->textures[p], view);
      }

      if (tex->textures[p]) {
         fd_resource_set_usage(tex->textures[p]->texture, FD_DIRTY_TEX);
         tex->valid_textures |= (1 << p);
      } else {
         tex->valid_textures &= ~(1 << p);
      }
   }
   for (; i < nr + unbind_num_trailing_slots; i++) {
      unsigned p = i + start;
      pipe_sampler_view_reference(&tex->textures[p], NULL);
      tex->valid_textures &= ~(1 << p);
   }

   tex->num_textures = util_last_bit(tex->valid_textures);
}

void
fd_sampler_states_bind(struct pipe_context *pctx, enum pipe_shader_type shader,
                       unsigned start, unsigned nr, void **hwcso) in_dt
{
   struct fd_context *ctx = fd_context(pctx);

   bind_sampler_states(&ctx->tex[shader], start, nr, hwcso);
   fd_context_dirty_shader(ctx, shader, FD_DIRTY_SHADER_TEX);
}

void
fd_set_sampler_views(struct pipe_context *pctx, enum pipe_shader_type shader,
                     unsigned start, unsigned nr,
                     unsigned unbind_num_trailing_slots,
                     bool take_ownership,
                     struct pipe_sampler_view **views) in_dt
{
   struct fd_context *ctx = fd_context(pctx);

   set_sampler_views(&ctx->tex[shader], start, nr, unbind_num_trailing_slots,
                     take_ownership, views);
   fd_context_dirty_shader(ctx, shader, FD_DIRTY_SHADER_TEX);
}

void
fd_texture_init(struct pipe_context *pctx)
{
   if (!pctx->delete_sampler_state)
      pctx->delete_sampler_state = fd_sampler_state_delete;
   if (!pctx->sampler_view_destroy)
      pctx->sampler_view_destroy = fd_sampler_view_destroy;
}

/* helper for setting up border-color buffer for a3xx/a4xx: */
void
fd_setup_border_colors(struct fd_texture_stateobj *tex, void *ptr,
                       unsigned offset)
{
   unsigned i, j;

   for (i = 0; i < tex->num_samplers; i++) {
      struct pipe_sampler_state *sampler = tex->samplers[i];
      uint16_t *bcolor =
         (uint16_t *)((uint8_t *)ptr + (BORDERCOLOR_SIZE * offset) +
                      (BORDERCOLOR_SIZE * i));
      uint32_t *bcolor32 = (uint32_t *)&bcolor[16];

      if (!sampler)
         continue;

      /*
       * XXX HACK ALERT XXX
       *
       * The border colors need to be swizzled in a particular
       * format-dependent order. Even though samplers don't know about
       * formats, we can assume that with a GL state tracker, there's a
       * 1:1 correspondence between sampler and texture. Take advantage
       * of that knowledge.
       */
      if (i < tex->num_textures && tex->textures[i]) {
         const struct util_format_description *desc =
            util_format_description(tex->textures[i]->format);
         for (j = 0; j < 4; j++) {
            if (desc->swizzle[j] >= 4)
               continue;

            const struct util_format_channel_description *chan =
               &desc->channel[desc->swizzle[j]];
            if (chan->pure_integer) {
               bcolor32[desc->swizzle[j] + 4] = sampler->border_color.i[j];
               bcolor[desc->swizzle[j] + 8] = sampler->border_color.i[j];
            } else {
               bcolor32[desc->swizzle[j]] = fui(sampler->border_color.f[j]);
               bcolor[desc->swizzle[j]] =
                  _mesa_float_to_half(sampler->border_color.f[j]);
            }
         }
      }
   }
}
