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/**************************************************************************

 *

 * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.

 * All Rights Reserved.

 *

 * 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, sub license, 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 NON-INFRINGEMENT.

 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS 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:

 *  Brian Paul

 */

#include "util/u_inlines.h"

#include "util/u_memory.h"

#include "draw/draw_context.h"

#include "lp_context.h"

#include "lp_screen.h"

#include "lp_state.h"

#include "lp_debug.h"

#include "state_tracker/sw_winsys.h"

static void *

llvmpipe_create_sampler_state(struct pipe_context *pipe,

                              const struct pipe_sampler_state *sampler)

{

   struct pipe_sampler_state *state = mem_dup(sampler, sizeof *sampler);

   if (LP_PERF & PERF_NO_MIP_LINEAR) {

      if (state->min_mip_filter == PIPE_TEX_MIPFILTER_LINEAR)

	 state->min_mip_filter = PIPE_TEX_MIPFILTER_NEAREST;

   }

   if (LP_PERF & PERF_NO_MIPMAPS)

      state->min_mip_filter = PIPE_TEX_MIPFILTER_NONE;

   if (LP_PERF & PERF_NO_LINEAR) {

      state->mag_img_filter = PIPE_TEX_FILTER_NEAREST;

      state->min_img_filter = PIPE_TEX_FILTER_NEAREST;

   }

   return state;

}

static void

llvmpipe_bind_sampler_states(struct pipe_context *pipe,

                             unsigned shader,

                             unsigned start,

                             unsigned num,

                             void **samplers)

{

   struct llvmpipe_context *llvmpipe = llvmpipe_context(pipe);

   unsigned i;

   assert(shader < PIPE_SHADER_TYPES);

   assert(start + num <= Elements(llvmpipe->samplers[shader]));

   /* Check for no-op */

   if (start + num <= llvmpipe->num_samplers[shader] &&

       !memcmp(llvmpipe->samplers[shader] + start, samplers,

               num * sizeof(void *))) {

      return;

   }

   draw_flush(llvmpipe->draw);

   /* set the new samplers */

   for (i = 0; i < num; i++) {

      llvmpipe->samplers[shader][start + i] = samplers[i];

   }

   /* find highest non-null samplers[] entry */

   {

      unsigned j = MAX2(llvmpipe->num_samplers[shader], start + num);

      while (j > 0 && llvmpipe->samplers[shader][j - 1] == NULL)

         j--;

      llvmpipe->num_samplers[shader] = j;

   }

   if (shader == PIPE_SHADER_VERTEX || shader == PIPE_SHADER_GEOMETRY) {

      draw_set_samplers(llvmpipe->draw,

                        shader,

                        llvmpipe->samplers[shader],

                        llvmpipe->num_samplers[shader]);

   }

   llvmpipe->dirty |= LP_NEW_SAMPLER;

}

static void

llvmpipe_bind_fragment_sampler_states(struct pipe_context *pipe,

                                      unsigned num, void **samplers)

{

   llvmpipe_bind_sampler_states(pipe, PIPE_SHADER_FRAGMENT, 0, num, samplers);

}

static void

llvmpipe_bind_vertex_sampler_states(struct pipe_context *pipe,

                                    unsigned num, void **samplers)

{

   llvmpipe_bind_sampler_states(pipe, PIPE_SHADER_VERTEX, 0, num, samplers);

}

static void

llvmpipe_bind_geometry_sampler_states(struct pipe_context *pipe,

                                      unsigned num, void **samplers)

{

   llvmpipe_bind_sampler_states(pipe, PIPE_SHADER_GEOMETRY, 0, num, samplers);

}

static void

llvmpipe_set_sampler_views(struct pipe_context *pipe,

                           unsigned shader,

                           unsigned start,

                           unsigned num,

                           struct pipe_sampler_view **views)

{

   struct llvmpipe_context *llvmpipe = llvmpipe_context(pipe);

   uint i;

   assert(num <= PIPE_MAX_SHADER_SAMPLER_VIEWS);

   assert(shader < PIPE_SHADER_TYPES);

   assert(start + num <= Elements(llvmpipe->sampler_views[shader]));

   /* Check for no-op */

   if (start + num <= llvmpipe->num_sampler_views[shader] &&

       !memcmp(llvmpipe->sampler_views[shader] + start, views,

               num * sizeof(struct pipe_sampler_view *))) {

      return;

   }

   draw_flush(llvmpipe->draw);

   /* set the new sampler views */

   for (i = 0; i < num; i++) {

      pipe_sampler_view_reference(&llvmpipe->sampler_views[shader][start + i],

                                  views[i]);

   }

   /* find highest non-null sampler_views[] entry */

   {

      unsigned j = MAX2(llvmpipe->num_sampler_views[shader], start + num);

      while (j > 0 && llvmpipe->sampler_views[shader][j - 1] == NULL)

         j--;

      llvmpipe->num_sampler_views[shader] = j;

   }

   if (shader == PIPE_SHADER_VERTEX || shader == PIPE_SHADER_GEOMETRY) {

      draw_set_sampler_views(llvmpipe->draw,

                             shader,

                             llvmpipe->sampler_views[shader],

                             llvmpipe->num_sampler_views[shader]);

   }

   llvmpipe->dirty |= LP_NEW_SAMPLER_VIEW;

}

static void

llvmpipe_set_fragment_sampler_views(struct pipe_context *pipe,

                                    unsigned num,

                                    struct pipe_sampler_view **views)

{

   llvmpipe_set_sampler_views(pipe, PIPE_SHADER_FRAGMENT, 0, num, views);

}

static void

llvmpipe_set_vertex_sampler_views(struct pipe_context *pipe,

                                  unsigned num,

                                  struct pipe_sampler_view **views)

{

   llvmpipe_set_sampler_views(pipe, PIPE_SHADER_VERTEX, 0, num, views);

}

static void

llvmpipe_set_geometry_sampler_views(struct pipe_context *pipe,

                                    unsigned num,

                                    struct pipe_sampler_view **views)

{

   llvmpipe_set_sampler_views(pipe, PIPE_SHADER_GEOMETRY, 0, num, views);

}

static struct pipe_sampler_view *

llvmpipe_create_sampler_view(struct pipe_context *pipe,

                            struct pipe_resource *texture,

                            const struct pipe_sampler_view *templ)

{

   struct pipe_sampler_view *view = CALLOC_STRUCT(pipe_sampler_view);

   /*

    * XXX we REALLY want to see the correct bind flag here but the OpenGL

    * state tracker can't guarantee that at least for texture buffer objects.

    */

   if (!(texture->bind & PIPE_BIND_SAMPLER_VIEW))

      debug_printf("Illegal sampler view creation without bind flag\n");

   if (view) {

      *view = *templ;

      view->reference.count = 1;

      view->texture = NULL;

      pipe_resource_reference(&view->texture, texture);

      view->context = pipe;

   }

   return view;

}

static void

llvmpipe_sampler_view_destroy(struct pipe_context *pipe,

                              struct pipe_sampler_view *view)

{

   pipe_resource_reference(&view->texture, NULL);

   FREE(view);

}

static void

llvmpipe_delete_sampler_state(struct pipe_context *pipe,

                              void *sampler)

{

   FREE( sampler );

}

static void

prepare_shader_sampling(

   struct llvmpipe_context *lp,

   unsigned num,

   struct pipe_sampler_view **views,

   unsigned shader_type,

   struct pipe_resource *mapped_tex[PIPE_MAX_SHADER_SAMPLER_VIEWS])

{

   unsigned i;

   uint32_t row_stride[PIPE_MAX_TEXTURE_LEVELS];

   uint32_t img_stride[PIPE_MAX_TEXTURE_LEVELS];

   uint32_t mip_offsets[PIPE_MAX_TEXTURE_LEVELS];

   const void *addr;

   assert(num <= PIPE_MAX_SHADER_SAMPLER_VIEWS);

   if (!num)

      return;

   for (i = 0; i < PIPE_MAX_SHADER_SAMPLER_VIEWS; i++) {

      struct pipe_sampler_view *view = i < num ? views[i] : NULL;

      if (view) {

         struct pipe_resource *tex = view->texture;

         struct llvmpipe_resource *lp_tex = llvmpipe_resource(tex);

         unsigned width0 = tex->width0;

         unsigned num_layers = tex->depth0;

         unsigned first_level = 0;

         unsigned last_level = 0;

         /* We're referencing the texture's internal data, so save a

          * reference to it.

          */

         pipe_resource_reference(&mapped_tex[i], tex);

         if (!lp_tex->dt) {

            /* regular texture - setup array of mipmap level offsets */

            struct pipe_resource *res = view->texture;

            int j;

            void *mip_ptr;

            if (llvmpipe_resource_is_texture(res)) {

               first_level = view->u.tex.first_level;

               last_level = view->u.tex.last_level;

               assert(first_level <= last_level);

               assert(last_level <= res->last_level);

               /* must trigger allocation first before we can get base ptr */

               /* XXX this may fail due to OOM ? */

               mip_ptr = llvmpipe_get_texture_image_all(lp_tex, view->u.tex.first_level,

                                                        LP_TEX_USAGE_READ);

               addr = lp_tex->linear_img.data;

               for (j = first_level; j <= last_level; j++) {

                  mip_ptr = llvmpipe_get_texture_image_all(lp_tex, j,

                                                           LP_TEX_USAGE_READ);

                  mip_offsets[j] = (uint8_t *)mip_ptr - (uint8_t *)addr;

                  /*

                   * could get mip offset directly but need call above to

                   * invoke tiled->linear conversion.

                   */

                  assert(lp_tex->linear_mip_offsets[j] == mip_offsets[j]);

                  row_stride[j] = lp_tex->row_stride[j];

                  img_stride[j] = lp_tex->img_stride[j];

               }

               if (res->target == PIPE_TEXTURE_1D_ARRAY ||

                   res->target == PIPE_TEXTURE_2D_ARRAY) {

                  num_layers = view->u.tex.last_layer - view->u.tex.first_layer + 1;

                  for (j = first_level; j <= last_level; j++) {

                     mip_offsets[j] += view->u.tex.first_layer *

                                       lp_tex->img_stride[j];

                  }

                  assert(view->u.tex.first_layer <= view->u.tex.last_layer);

                  assert(view->u.tex.last_layer < res->array_size);

               }

            }

            else {

               unsigned view_blocksize = util_format_get_blocksize(view->format);

               mip_ptr = lp_tex->data;

               addr = mip_ptr;

               /* probably don't really need to fill that out */

               mip_offsets[0] = 0;

               row_stride[0] = 0;

               row_stride[0] = 0;

               /* everything specified in number of elements here. */

               width0 = view->u.buf.last_element - view->u.buf.first_element + 1;

               addr = (uint8_t *)addr + view->u.buf.first_element *

                               view_blocksize;

               assert(view->u.buf.first_element <= view->u.buf.last_element);

               assert(view->u.buf.last_element * view_blocksize < res->width0);

            }

         }

         else {

            /* display target texture/surface */

            /*

             * XXX: Where should this be unmapped?

             */

            struct llvmpipe_screen *screen = llvmpipe_screen(tex->screen);

            struct sw_winsys *winsys = screen->winsys;

            addr = winsys->displaytarget_map(winsys, lp_tex->dt,

                                                PIPE_TRANSFER_READ);

            row_stride[0] = lp_tex->row_stride[0];

            img_stride[0] = lp_tex->img_stride[0];

            mip_offsets[0] = 0;

            assert(addr);

         }

         draw_set_mapped_texture(lp->draw,

                                 shader_type,

                                 i,

                                 width0, tex->height0, num_layers,

                                 first_level, last_level,

                                 addr,

                                 row_stride, img_stride, mip_offsets);

      }

   }

}

/**

 * Called during state validation when LP_NEW_SAMPLER_VIEW is set.

 */

void

llvmpipe_prepare_vertex_sampling(struct llvmpipe_context *lp,

                                 unsigned num,

                                 struct pipe_sampler_view **views)

{

   prepare_shader_sampling(lp, num, views, PIPE_SHADER_VERTEX,

                           lp->mapped_vs_tex);

}

void

llvmpipe_cleanup_vertex_sampling(struct llvmpipe_context *ctx)

{

   unsigned i;

   for (i = 0; i < Elements(ctx->mapped_vs_tex); i++) {

      pipe_resource_reference(&ctx->mapped_vs_tex[i], NULL);

   }

}

/**

 * Called during state validation when LP_NEW_SAMPLER_VIEW is set.

 */

void

llvmpipe_prepare_geometry_sampling(struct llvmpipe_context *lp,

                                   unsigned num,

                                   struct pipe_sampler_view **views)

{

   prepare_shader_sampling(lp, num, views, PIPE_SHADER_GEOMETRY,

                           lp->mapped_gs_tex);

}

void

llvmpipe_cleanup_geometry_sampling(struct llvmpipe_context *ctx)

{

   unsigned i;

   for (i = 0; i < Elements(ctx->mapped_gs_tex); i++) {

      pipe_resource_reference(&ctx->mapped_gs_tex[i], NULL);

   }

}

void

llvmpipe_init_sampler_funcs(struct llvmpipe_context *llvmpipe)

{

   llvmpipe->pipe.create_sampler_state = llvmpipe_create_sampler_state;

   llvmpipe->pipe.bind_fragment_sampler_states  = llvmpipe_bind_fragment_sampler_states;

   llvmpipe->pipe.bind_vertex_sampler_states  = llvmpipe_bind_vertex_sampler_states;

   llvmpipe->pipe.bind_geometry_sampler_states  = llvmpipe_bind_geometry_sampler_states;

   llvmpipe->pipe.set_fragment_sampler_views = llvmpipe_set_fragment_sampler_views;

   llvmpipe->pipe.set_vertex_sampler_views = llvmpipe_set_vertex_sampler_views;

   llvmpipe->pipe.set_geometry_sampler_views = llvmpipe_set_geometry_sampler_views;

   llvmpipe->pipe.create_sampler_view = llvmpipe_create_sampler_view;

   llvmpipe->pipe.sampler_view_destroy = llvmpipe_sampler_view_destroy;

   llvmpipe->pipe.delete_sampler_state = llvmpipe_delete_sampler_state;

}