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

 *

 * Copyright 2006 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:

  *   Keith Whitwell 

  *   Michel Dänzer 

  */

#include "pipe/p_defines.h"

#include "util/u_inlines.h"

#include "util/u_format.h"

#include "util/u_math.h"

#include "util/u_memory.h"

#include "util/u_transfer.h"

#include "sp_context.h"

#include "sp_flush.h"

#include "sp_texture.h"

#include "sp_screen.h"

#include "state_tracker/sw_winsys.h"

/**

 * Conventional allocation path for non-display textures:

 * Use a simple, maximally packed layout.

 */

static boolean

softpipe_resource_layout(struct pipe_screen *screen,

                         struct softpipe_resource *spr,

                         boolean allocate)

{

   struct pipe_resource *pt = &spr->base;

   unsigned level;

   unsigned width = pt->width0;

   unsigned height = pt->height0;

   unsigned depth = pt->depth0;

   unsigned buffer_size = 0;

   for (level = 0; level <= pt->last_level; level++) {

      unsigned slices;

      if (pt->target == PIPE_TEXTURE_CUBE)

         slices = 6;

      else if (pt->target == PIPE_TEXTURE_3D)

         slices = depth;

      else

         slices = pt->array_size;

      spr->stride[level] = util_format_get_stride(pt->format, width);

      spr->level_offset[level] = buffer_size;

      buffer_size += (util_format_get_nblocksy(pt->format, height) *

                      slices * spr->stride[level]);

      width  = u_minify(width, 1);

      height = u_minify(height, 1);

      depth = u_minify(depth, 1);

   }

   if (buffer_size > SP_MAX_TEXTURE_SIZE)

      return FALSE;

   if (allocate) {

      spr->data = align_malloc(buffer_size, 16);

      return spr->data != NULL;

   }

   else {

      return TRUE;

   }

}

/**

 * Check the size of the texture specified by 'res'.

 * \return TRUE if OK, FALSE if too large.

 */

static boolean

softpipe_can_create_resource(struct pipe_screen *screen,

                             const struct pipe_resource *res)

{

   struct softpipe_resource spr;

   memset(&spr, 0, sizeof(spr));

   spr.base = *res;

   return softpipe_resource_layout(screen, &spr, FALSE);

}

/**

 * Texture layout for simple color buffers.

 */

static boolean

softpipe_displaytarget_layout(struct pipe_screen *screen,

                              struct softpipe_resource *spr)

{

   struct sw_winsys *winsys = softpipe_screen(screen)->winsys;

   /* Round up the surface size to a multiple of the tile size?

    */

   spr->dt = winsys->displaytarget_create(winsys,

                                          spr->base.bind,

                                          spr->base.format,

                                          spr->base.width0,

                                          spr->base.height0,

                                          16,

                                          &spr->stride[0] );

   return spr->dt != NULL;

}

/**

 * Create new pipe_resource given the template information.

 */

static struct pipe_resource *

softpipe_resource_create(struct pipe_screen *screen,

                         const struct pipe_resource *templat)

{

   struct softpipe_resource *spr = CALLOC_STRUCT(softpipe_resource);

   if (!spr)

      return NULL;

   assert(templat->format != PIPE_FORMAT_NONE);

   spr->base = *templat;

   pipe_reference_init(&spr->base.reference, 1);

   spr->base.screen = screen;

   spr->pot = (util_is_power_of_two(templat->width0) &&

               util_is_power_of_two(templat->height0) &&

               util_is_power_of_two(templat->depth0));

   if (spr->base.bind & (PIPE_BIND_DISPLAY_TARGET |

			 PIPE_BIND_SCANOUT |

			 PIPE_BIND_SHARED)) {

      if (!softpipe_displaytarget_layout(screen, spr))

         goto fail;

   }

   else {

      if (!softpipe_resource_layout(screen, spr, TRUE))

         goto fail;

   }

   return &spr->base;

 fail:

   FREE(spr);

   return NULL;

}

static void

softpipe_resource_destroy(struct pipe_screen *pscreen,

			  struct pipe_resource *pt)

{

   struct softpipe_screen *screen = softpipe_screen(pscreen);

   struct softpipe_resource *spr = softpipe_resource(pt);

   if (spr->dt) {

      /* display target */

      struct sw_winsys *winsys = screen->winsys;

      winsys->displaytarget_destroy(winsys, spr->dt);

   }

   else if (!spr->userBuffer) {

      /* regular texture */

      align_free(spr->data);

   }

   FREE(spr);

}

static struct pipe_resource *

softpipe_resource_from_handle(struct pipe_screen *screen,

                              const struct pipe_resource *templat,

                              struct winsys_handle *whandle)

{

   struct sw_winsys *winsys = softpipe_screen(screen)->winsys;

   struct softpipe_resource *spr = CALLOC_STRUCT(softpipe_resource);

   if (!spr)

      return NULL;

   spr->base = *templat;

   pipe_reference_init(&spr->base.reference, 1);

   spr->base.screen = screen;

   spr->pot = (util_is_power_of_two(templat->width0) &&

               util_is_power_of_two(templat->height0) &&

               util_is_power_of_two(templat->depth0));

   spr->dt = winsys->displaytarget_from_handle(winsys,

                                               templat,

                                               whandle,

                                               &spr->stride[0]);

   if (!spr->dt)

      goto fail;

   return &spr->base;

 fail:

   FREE(spr);

   return NULL;

}

static boolean

softpipe_resource_get_handle(struct pipe_screen *screen,

                             struct pipe_resource *pt,

                             struct winsys_handle *whandle)

{

   struct sw_winsys *winsys = softpipe_screen(screen)->winsys;

   struct softpipe_resource *spr = softpipe_resource(pt);

   assert(spr->dt);

   if (!spr->dt)

      return FALSE;

   return winsys->displaytarget_get_handle(winsys, spr->dt, whandle);

}

/**

 * Helper function to compute offset (in bytes) for a particular

 * texture level/face/slice from the start of the buffer.

 */

static unsigned

sp_get_tex_image_offset(const struct softpipe_resource *spr,

                        unsigned level, unsigned layer)

{

   const unsigned hgt = u_minify(spr->base.height0, level);

   const unsigned nblocksy = util_format_get_nblocksy(spr->base.format, hgt);

   unsigned offset = spr->level_offset[level];

   if (spr->base.target == PIPE_TEXTURE_CUBE ||

       spr->base.target == PIPE_TEXTURE_CUBE_ARRAY ||

       spr->base.target == PIPE_TEXTURE_3D ||

       spr->base.target == PIPE_TEXTURE_2D_ARRAY) {

      offset += layer * nblocksy * spr->stride[level];

   }

   else if (spr->base.target == PIPE_TEXTURE_1D_ARRAY) {

      offset += layer * spr->stride[level];

   }

   else {

      assert(layer == 0);

   }

   return offset;

}

/**

 * Get a pipe_surface "view" into a texture resource.

 */

static struct pipe_surface *

softpipe_create_surface(struct pipe_context *pipe,

                        struct pipe_resource *pt,

                        const struct pipe_surface *surf_tmpl)

{

   struct pipe_surface *ps;

   ps = CALLOC_STRUCT(pipe_surface);

   if (ps) {

      pipe_reference_init(&ps->reference, 1);

      pipe_resource_reference(&ps->texture, pt);

      ps->context = pipe;

      ps->format = surf_tmpl->format;

      if (pt->target != PIPE_BUFFER) {

         assert(surf_tmpl->u.tex.level <= pt->last_level);

         ps->width = u_minify(pt->width0, surf_tmpl->u.tex.level);

         ps->height = u_minify(pt->height0, surf_tmpl->u.tex.level);

         ps->u.tex.level = surf_tmpl->u.tex.level;

         ps->u.tex.first_layer = surf_tmpl->u.tex.first_layer;

         ps->u.tex.last_layer = surf_tmpl->u.tex.last_layer;

         if (ps->u.tex.first_layer != ps->u.tex.last_layer) {

            debug_printf("creating surface with multiple layers, rendering to first layer only\n");

         }

      }

      else {

         /* setting width as number of elements should get us correct renderbuffer width */

         ps->width = surf_tmpl->u.buf.last_element - surf_tmpl->u.buf.first_element + 1;

         ps->height = pt->height0;

         ps->u.buf.first_element = surf_tmpl->u.buf.first_element;

         ps->u.buf.last_element = surf_tmpl->u.buf.last_element;

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

         assert(ps->u.buf.last_element < ps->width);

      }

   }

   return ps;

}

/**

 * Free a pipe_surface which was created with softpipe_create_surface().

 */

static void

softpipe_surface_destroy(struct pipe_context *pipe,

                         struct pipe_surface *surf)

{

   /* Effectively do the texture_update work here - if texture images

    * needed post-processing to put them into hardware layout, this is

    * where it would happen.  For softpipe, nothing to do.

    */

   assert(surf->texture);

   pipe_resource_reference(&surf->texture, NULL);

   FREE(surf);

}

/**

 * Geta pipe_transfer object which is used for moving data in/out of

 * a resource object.

 * \param pipe  rendering context

 * \param resource  the resource to transfer in/out of

 * \param level  which mipmap level

 * \param usage  bitmask of PIPE_TRANSFER_x flags

 * \param box  the 1D/2D/3D region of interest

 */

static void *

softpipe_transfer_map(struct pipe_context *pipe,

                      struct pipe_resource *resource,

                      unsigned level,

                      unsigned usage,

                      const struct pipe_box *box,

                      struct pipe_transfer **transfer)

{

   struct sw_winsys *winsys = softpipe_screen(pipe->screen)->winsys;

   struct softpipe_resource *spr = softpipe_resource(resource);

   struct softpipe_transfer *spt;

   struct pipe_transfer *pt;

   enum pipe_format format = resource->format;

   const unsigned hgt = u_minify(spr->base.height0, level);

   const unsigned nblocksy = util_format_get_nblocksy(format, hgt);

   uint8_t *map;

   assert(resource);

   assert(level <= resource->last_level);

   /* make sure the requested region is in the image bounds */

   assert(box->x + box->width <= u_minify(resource->width0, level));

   if (resource->target == PIPE_TEXTURE_1D_ARRAY) {

      assert(box->y + box->height <= resource->array_size);

   }

   else {

      assert(box->y + box->height <= u_minify(resource->height0, level));

      if (resource->target == PIPE_TEXTURE_2D_ARRAY) {

         assert(box->z + box->depth <= resource->array_size);

      }

      else if (resource->target == PIPE_TEXTURE_CUBE) {

         assert(box->z < 6);

      }

      else if (resource->target == PIPE_TEXTURE_CUBE_ARRAY) {

         assert(box->z <= resource->array_size);

      }

      else {

         assert(box->z + box->depth <= (u_minify(resource->depth0, level)));

      }

   }

   /*

    * Transfers, like other pipe operations, must happen in order, so flush the

    * context if necessary.

    */

   if (!(usage & PIPE_TRANSFER_UNSYNCHRONIZED)) {

      boolean read_only = !(usage & PIPE_TRANSFER_WRITE);

      boolean do_not_block = !!(usage & PIPE_TRANSFER_DONTBLOCK);

      if (!softpipe_flush_resource(pipe, resource,

                                   level, box->depth > 1 ? -1 : box->z,

                                   0, /* flush_flags */

                                   read_only,

                                   TRUE, /* cpu_access */

                                   do_not_block)) {

         /*

          * It would have blocked, but state tracker requested no to.

          */

         assert(do_not_block);

         return NULL;

      }

   }

   spt = CALLOC_STRUCT(softpipe_transfer);

   if (!spt)

      return NULL;

   pt = &spt->base;

   pipe_resource_reference(&pt->resource, resource);

   pt->level = level;

   pt->usage = usage;

   pt->box = *box;

   pt->stride = spr->stride[level];

   pt->layer_stride = pt->stride * nblocksy;

   spt->offset = sp_get_tex_image_offset(spr, level, box->z);

   spt->offset +=

         box->y / util_format_get_blockheight(format) * spt->base.stride +

         box->x / util_format_get_blockwidth(format) * util_format_get_blocksize(format);

   /* resources backed by display target treated specially:

    */

   if (spr->dt) {

      map = winsys->displaytarget_map(winsys, spr->dt, usage);

   }

   else {

      map = spr->data;

   }

   if (map == NULL) {

      pipe_resource_reference(&pt->resource, NULL);

      FREE(spt);

      return NULL;

   }

   *transfer = pt;

   return map + spt->offset;

}

/**

 * Unmap memory mapping for given pipe_transfer object.

 */

static void

softpipe_transfer_unmap(struct pipe_context *pipe,

                        struct pipe_transfer *transfer)

{

   struct softpipe_resource *spr;

   assert(transfer->resource);

   spr = softpipe_resource(transfer->resource);

   if (spr->dt) {

      /* display target */

      struct sw_winsys *winsys = softpipe_screen(pipe->screen)->winsys;

      winsys->displaytarget_unmap(winsys, spr->dt);

   }

   if (transfer->usage & PIPE_TRANSFER_WRITE) {

      /* Mark the texture as dirty to expire the tile caches. */

      spr->timestamp++;

   }

   pipe_resource_reference(&transfer->resource, NULL);

   FREE(transfer);

}

/**

 * Create buffer which wraps user-space data.

 */

struct pipe_resource *

softpipe_user_buffer_create(struct pipe_screen *screen,

                            void *ptr,

                            unsigned bytes,

			    unsigned bind_flags)

{

   struct softpipe_resource *spr;

   spr = CALLOC_STRUCT(softpipe_resource);

   if (!spr)

      return NULL;

   pipe_reference_init(&spr->base.reference, 1);

   spr->base.screen = screen;

   spr->base.format = PIPE_FORMAT_R8_UNORM; /* ?? */

   spr->base.bind = bind_flags;

   spr->base.usage = PIPE_USAGE_IMMUTABLE;

   spr->base.flags = 0;

   spr->base.width0 = bytes;

   spr->base.height0 = 1;

   spr->base.depth0 = 1;

   spr->base.array_size = 1;

   spr->userBuffer = TRUE;

   spr->data = ptr;

   return &spr->base;

}

void

softpipe_init_texture_funcs(struct pipe_context *pipe)

{

   pipe->transfer_map = softpipe_transfer_map;

   pipe->transfer_unmap = softpipe_transfer_unmap;

   pipe->transfer_flush_region = u_default_transfer_flush_region;

   pipe->transfer_inline_write = u_default_transfer_inline_write;

   pipe->create_surface = softpipe_create_surface;

   pipe->surface_destroy = softpipe_surface_destroy;

}

void

softpipe_init_screen_texture_funcs(struct pipe_screen *screen)

{

   screen->resource_create = softpipe_resource_create;

   screen->resource_destroy = softpipe_resource_destroy;

   screen->resource_from_handle = softpipe_resource_from_handle;

   screen->resource_get_handle = softpipe_resource_get_handle;

   screen->can_create_resource = softpipe_can_create_resource;

}