text: /**************************************************************************
   * 
   * Copyright 2007 VMware, Inc.
   * 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 VMWARE 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_memory.h"
  #include "util/u_inlines.h"
  #include "util/u_format.h"
  
  #include "draw/draw_context.h"
  
  #include "sp_context.h"
  #include "sp_state.h"
  #include "sp_texture.h"
  #include "sp_tex_sample.h"
  #include "sp_tex_tile_cache.h"
  #include "sp_screen.h"
  #include "state_tracker/sw_winsys.h"
  
  
  /**
   * Bind a range [start, start+num-1] of samplers for a shader stage.
   */
  static void
  softpipe_bind_sampler_states(struct pipe_context *pipe,
                               enum pipe_shader_type shader,
                               unsigned start,
                               unsigned num,
                               void **samplers)
  {
     struct softpipe_context *softpipe = softpipe_context(pipe);
     unsigned i;
  
     assert(shader < PIPE_SHADER_TYPES);
     assert(start + num <= ARRAY_SIZE(softpipe->samplers[shader]));
  
     draw_flush(softpipe->draw);
  
     /* set the new samplers */
     for (i = 0; i < num; i++) {
        softpipe->samplers[shader][start + i] = samplers[i];
     }
  
     /* find highest non-null samplers[] entry */
     {
        unsigned j = MAX2(softpipe->num_samplers[shader], start + num);
        while (j > 0 && softpipe->samplers[shader][j - 1] == NULL)
           j--;
        softpipe->num_samplers[shader] = j;
     }
  
     if (shader == PIPE_SHADER_VERTEX || shader == PIPE_SHADER_GEOMETRY) {
        draw_set_samplers(softpipe->draw,
                          shader,
                          softpipe->samplers[shader],
                          softpipe->num_samplers[shader]);
     }
  
     softpipe->dirty |= SP_NEW_SAMPLER;
  }
  
  
  static void
  softpipe_sampler_view_destroy(struct pipe_context *pipe,
                                struct pipe_sampler_view *view)
  {
     pipe_resource_reference(&view->texture, NULL);
     FREE(view);
  }
  
  
  void
  softpipe_set_sampler_views(struct pipe_context *pipe,
                             enum pipe_shader_type shader,
                             unsigned start,
                             unsigned num,
                             struct pipe_sampler_view **views)
  {
     struct softpipe_context *softpipe = softpipe_context(pipe);
     uint i;
  
     assert(shader < PIPE_SHADER_TYPES);
     assert(start + num <= ARRAY_SIZE(softpipe->sampler_views[shader]));
  
     draw_flush(softpipe->draw);
  
     /* set the new sampler views */
     for (i = 0; i < num; i++) {
        struct sp_sampler_view *sp_sviewsrc;
        struct sp_sampler_view *sp_sviewdst =
           &softpipe->tgsi.sampler[shader]->sp_sview[start + i];
        struct pipe_sampler_view **pview = &softpipe->sampler_views[shader][start + i];
        pipe_sampler_view_reference(pview, views[i]);
        sp_tex_tile_cache_set_sampler_view(softpipe->tex_cache[shader][start + i],
                                           views[i]);
        /*
         * We don't really have variants, however some bits are different per shader,
         * so just copy?
         */
        sp_sviewsrc = (struct sp_sampler_view *)*pview;
        if (sp_sviewsrc) {
           memcpy(sp_sviewdst, sp_sviewsrc, sizeof(*sp_sviewsrc));
           sp_sviewdst->compute_lambda = softpipe_get_lambda_func(&sp_sviewdst->base, shader);
           sp_sviewdst->compute_lambda_from_grad = softpipe_get_lambda_from_grad_func(&sp_sviewdst->base, shader);
           sp_sviewdst->cache = softpipe->tex_cache[shader][start + i];
        }
        else {
           memset(sp_sviewdst, 0,  sizeof(*sp_sviewsrc));
        }
     }
  
  
     /* find highest non-null sampler_views[] entry */
     {
        unsigned j = MAX2(softpipe->num_sampler_views[shader], start + num);
        while (j > 0 && softpipe->sampler_views[shader][j - 1] == NULL)
           j--;
        softpipe->num_sampler_views[shader] = j;
     }
  
     if (shader == PIPE_SHADER_VERTEX || shader == PIPE_SHADER_GEOMETRY) {
        draw_set_sampler_views(softpipe->draw,
                               shader,
                               softpipe->sampler_views[shader],
                               softpipe->num_sampler_views[shader]);
     }
  
     softpipe->dirty |= SP_NEW_TEXTURE;
  }
  
  
  static void
  softpipe_delete_sampler_state(struct pipe_context *pipe,
                                void *sampler)
  {
     FREE( sampler );
  }
  
  
  static void
  prepare_shader_sampling(
     struct softpipe_context *sp,
     unsigned num,
     struct pipe_sampler_view **views,
     enum pipe_shader_type 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 < num; i++) {
        struct pipe_sampler_view *view = views[i];
  
        if (view) {
           struct pipe_resource *tex = view->texture;
           struct softpipe_resource *sp_tex = softpipe_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 (!sp_tex->dt) {
              /* regular texture - setup array of mipmap level offsets */
              MAYBE_UNUSED struct pipe_resource *res = view->texture;
              int j;
  
              if (view->target != PIPE_BUFFER) {
                 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);
                 addr = sp_tex->data;
  
                 for (j = first_level; j <= last_level; j++) {
                    mip_offsets[j] = sp_tex->level_offset[j];
                    row_stride[j] = sp_tex->stride[j];
                    img_stride[j] = sp_tex->img_stride[j];
                 }
                 if (tex->target == PIPE_TEXTURE_1D_ARRAY ||
                     tex->target == PIPE_TEXTURE_2D_ARRAY ||
                     tex->target == PIPE_TEXTURE_CUBE ||
                     tex->target == PIPE_TEXTURE_CUBE_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 *
                                         sp_tex->img_stride[j];
                    }
                    if (view->target == PIPE_TEXTURE_CUBE ||
                        view->target == PIPE_TEXTURE_CUBE_ARRAY) {
                       assert(num_layers % 6 == 0);
                    }
                    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);
                 addr = sp_tex->data;
                 /* probably don't really need to fill that out */
                 mip_offsets[0] = 0;
                 row_stride[0] = 0;
                 img_stride[0] = 0;
  
                 /* everything specified in number of elements here. */
                 width0 = view->u.buf.size / view_blocksize;
                 addr = (uint8_t *)addr + view->u.buf.offset;
                 assert(view->u.buf.offset + view->u.buf.size <= res->width0);
              }
           }
           else {
              /* display target texture/surface */
              /*
               * XXX: Where should this be unmapped?
               */
              struct softpipe_screen *screen = softpipe_screen(tex->screen);
              struct sw_winsys *winsys = screen->winsys;
              addr = winsys->displaytarget_map(winsys, sp_tex->dt,
                                               PIPE_TRANSFER_READ);
              row_stride[0] = sp_tex->stride[0];
              img_stride[0] = sp_tex->img_stride[0];
              mip_offsets[0] = 0;
              assert(addr);
           }
           draw_set_mapped_texture(sp->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 SP_NEW_TEXTURE is set.
   */
  void
  softpipe_prepare_vertex_sampling(struct softpipe_context *sp,
                                   unsigned num,
                                   struct pipe_sampler_view **views)
  {
     prepare_shader_sampling(sp, num, views, PIPE_SHADER_VERTEX,
                             sp->mapped_vs_tex);
  }
  
  void
  softpipe_cleanup_vertex_sampling(struct softpipe_context *ctx)
  {
     unsigned i;
     for (i = 0; i < ARRAY_SIZE(ctx->mapped_vs_tex); i++) {
        pipe_resource_reference(&ctx->mapped_vs_tex[i], NULL);
     }
  }
  
  
  /**
   * Called during state validation when SP_NEW_TEXTURE is set.
   */
  void
  softpipe_prepare_geometry_sampling(struct softpipe_context *sp,
                                     unsigned num,
                                     struct pipe_sampler_view **views)
  {
     prepare_shader_sampling(sp, num, views, PIPE_SHADER_GEOMETRY,
                             sp->mapped_gs_tex);
  }
  
  void
  softpipe_cleanup_geometry_sampling(struct softpipe_context *ctx)
  {
     unsigned i;
     for (i = 0; i < ARRAY_SIZE(ctx->mapped_gs_tex); i++) {
        pipe_resource_reference(&ctx->mapped_gs_tex[i], NULL);
     }
  }
  
  
  void
  softpipe_init_sampler_funcs(struct pipe_context *pipe)
  {
     pipe->create_sampler_state = softpipe_create_sampler_state;
     pipe->bind_sampler_states = softpipe_bind_sampler_states;
     pipe->delete_sampler_state = softpipe_delete_sampler_state;
  
     pipe->create_sampler_view = softpipe_create_sampler_view;
     pipe->set_sampler_views = softpipe_set_sampler_views;
     pipe->sampler_view_destroy = softpipe_sampler_view_destroy;
  }
  
  