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

 * Copyright 2008-2009 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, 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 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.

 *

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

#include "util/u_format.h"

#include "util/u_inlines.h"

#include "util/u_prim.h"

#include "util/u_time.h"

#include "util/u_upload_mgr.h"

#include "indices/u_indices.h"

#include "svga_hw_reg.h"

#include "svga_cmd.h"

#include "svga_context.h"

#include "svga_screen.h"

#include "svga_draw.h"

#include "svga_state.h"

#include "svga_swtnl.h"

#include "svga_debug.h"

#include "svga_resource_buffer.h"

/**

 * Determine the ranges to upload for the user-buffers referenced

 * by the next draw command.

 *

 * TODO: It might be beneficial to support multiple ranges. In that case,

 * the struct svga_buffer::uploaded member should be made an array or a

 * list, since we need to account for the possibility that different ranges

 * may be uploaded to different hardware buffers chosen by the utility

 * upload manager.

 */

static void

svga_user_buffer_range(struct svga_context *svga,

                       unsigned start,

                       unsigned count,

                       unsigned instance_count)

{

   const struct pipe_vertex_element *ve = svga->curr.velems->velem;

   unsigned i;

   /*

    * Release old uploaded range (if not done already) and

    * initialize new ranges.

    */

   for (i=0; i < svga->curr.velems->count; i++) {

      struct pipe_vertex_buffer *vb =

         &svga->curr.vb[ve[i].vertex_buffer_index];

      if (vb->buffer && svga_buffer_is_user_buffer(vb->buffer)) {

         struct svga_buffer *buffer = svga_buffer(vb->buffer);

         pipe_resource_reference(&buffer->uploaded.buffer, NULL);

         buffer->uploaded.start = ~0;

         buffer->uploaded.end = 0;

      }

   }

   for (i=0; i < svga->curr.velems->count; i++) {

      struct pipe_vertex_buffer *vb =

         &svga->curr.vb[ve[i].vertex_buffer_index];

      if (vb->buffer && svga_buffer_is_user_buffer(vb->buffer)) {

         struct svga_buffer *buffer = svga_buffer(vb->buffer);

         unsigned first, size;

         unsigned instance_div = ve[i].instance_divisor;

         unsigned elemSize = util_format_get_blocksize(ve[i].src_format);

         svga->dirty |= SVGA_NEW_VBUFFER;

         if (instance_div) {

            first = ve[i].src_offset;

            count = (instance_count + instance_div - 1) / instance_div;

            size = vb->stride * (count - 1) + elemSize;

         } else {

            first = vb->stride * start + ve[i].src_offset;

            size = vb->stride * (count - 1) + elemSize;

         }

         buffer->uploaded.start = MIN2(buffer->uploaded.start, first);

         buffer->uploaded.end = MAX2(buffer->uploaded.end, first + size);

      }

   }

}

/**

 * svga_upload_user_buffers - upload parts of user buffers

 *

 * This function streams a part of a user buffer to hw and fills

 * svga_buffer::uploaded with information on the upload.

 */

static int

svga_upload_user_buffers(struct svga_context *svga,

                         unsigned start,

                         unsigned count,

                         unsigned instance_count)

{

   const struct pipe_vertex_element *ve = svga->curr.velems->velem;

   unsigned i;

   int ret;

   svga_user_buffer_range(svga, start, count, instance_count);

   for (i=0; i < svga->curr.velems->count; i++) {

      struct pipe_vertex_buffer *vb =

         &svga->curr.vb[ve[i].vertex_buffer_index];

      if (vb->buffer && svga_buffer_is_user_buffer(vb->buffer)) {

         struct svga_buffer *buffer = svga_buffer(vb->buffer);

         /*

          * Check if already uploaded. Otherwise go ahead and upload.

          */

         if (buffer->uploaded.buffer)

            continue;

         ret = u_upload_buffer( svga->upload_vb,

                                0,

                                buffer->uploaded.start,

                                buffer->uploaded.end - buffer->uploaded.start,

                                &buffer->b.b,

                                &buffer->uploaded.offset,

                                &buffer->uploaded.buffer);

         if (ret)

            return ret;

         if (0)

            debug_printf("%s: %d: orig buf %p upl buf %p ofs %d sofs %d"

                         " sz %d\n",

                         __FUNCTION__,

                         i,

                         buffer,

                         buffer->uploaded.buffer,

                         buffer->uploaded.offset,

                         buffer->uploaded.start,

                         buffer->uploaded.end - buffer->uploaded.start);

         vb->buffer_offset = buffer->uploaded.offset;

      }

   }

   return PIPE_OK;

}

/**

 * svga_release_user_upl_buffers - release uploaded parts of user buffers

 *

 * This function releases the hw copy of the uploaded fraction of the

 * user-buffer. It's important to do this as soon as all draw calls

 * affecting the uploaded fraction are issued, as this allows for

 * efficient reuse of the hardware surface backing the uploaded fraction.

 *

 * svga_buffer::source_offset is set to 0, and svga_buffer::uploaded::buffer

 * is set to 0.

 */

static void

svga_release_user_upl_buffers(struct svga_context *svga)

{

   unsigned i;

   unsigned nr;

   nr = svga->curr.num_vertex_buffers;

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

      struct pipe_vertex_buffer *vb = &svga->curr.vb[i];

      if (vb->buffer && svga_buffer_is_user_buffer(vb->buffer)) {

         struct svga_buffer *buffer = svga_buffer(vb->buffer);

         /* The buffer_offset is relative to the uploaded buffer.

          * Since we're discarding that buffer we need to reset this offset

          * so it's not inadvertantly applied to a subsequent draw.

          *

          * XXX a root problem here is that the svga->curr.vb[] information

          * is getting set both by gallium API calls and by code in

          * svga_upload_user_buffers().  We should instead have two copies

          * of the vertex buffer information and choose between as needed.

          */

         vb->buffer_offset = 0;

         buffer->uploaded.start = ~0;

         buffer->uploaded.end = 0;

         if (buffer->uploaded.buffer)

            pipe_resource_reference(&buffer->uploaded.buffer, NULL);

      }

   }

}

static enum pipe_error

retry_draw_range_elements( struct svga_context *svga,

                           struct pipe_resource *index_buffer,

                           unsigned index_size,

                           int index_bias,

                           unsigned min_index,

                           unsigned max_index,

                           unsigned prim,

                           unsigned start,

                           unsigned count,

                           unsigned instance_count,

                           boolean do_retry )

{

   enum pipe_error ret = PIPE_OK;

   svga_hwtnl_set_unfilled( svga->hwtnl,

                            svga->curr.rast->hw_unfilled );

   svga_hwtnl_set_flatshade( svga->hwtnl,

                             svga->curr.rast->templ.flatshade,

                             svga->curr.rast->templ.flatshade_first );

   ret = svga_upload_user_buffers( svga, min_index + index_bias,

                                   max_index - min_index + 1, instance_count );

   if (ret != PIPE_OK)

      goto retry;

   ret = svga_update_state( svga, SVGA_STATE_HW_DRAW );

   if (ret != PIPE_OK)

      goto retry;

   ret = svga_hwtnl_draw_range_elements( svga->hwtnl,

                                         index_buffer, index_size, index_bias,

                                         min_index, max_index,

                                         prim, start, count );

   if (ret != PIPE_OK)

      goto retry;

   return PIPE_OK;

retry:

   svga_context_flush( svga, NULL );

   if (do_retry)

   {

      return retry_draw_range_elements( svga,

                                        index_buffer, index_size, index_bias,

                                        min_index, max_index,

                                        prim, start, count,

                                        instance_count, FALSE );

   }

   return ret;

}

static enum pipe_error

retry_draw_arrays( struct svga_context *svga,

                   unsigned prim,

                   unsigned start,

                   unsigned count,

                   unsigned instance_count,

                   boolean do_retry )

{

   enum pipe_error ret;

   svga_hwtnl_set_unfilled( svga->hwtnl,

                            svga->curr.rast->hw_unfilled );

   svga_hwtnl_set_flatshade( svga->hwtnl,

                             svga->curr.rast->templ.flatshade,

                             svga->curr.rast->templ.flatshade_first );

   ret = svga_upload_user_buffers( svga, start, count, instance_count );

   if (ret != PIPE_OK)

      goto retry;

   ret = svga_update_state( svga, SVGA_STATE_HW_DRAW );

   if (ret != PIPE_OK)

      goto retry;

   ret = svga_hwtnl_draw_arrays( svga->hwtnl, prim,

                                 start, count );

   if (ret != PIPE_OK)

      goto retry;

   return PIPE_OK;

retry:

   if (ret == PIPE_ERROR_OUT_OF_MEMORY && do_retry)

   {

      svga_context_flush( svga, NULL );

      return retry_draw_arrays( svga,

                                prim,

                                start,

                                count,

                                instance_count,

                                FALSE );

   }

   return ret;

}

static void

svga_draw_vbo(struct pipe_context *pipe, const struct pipe_draw_info *info)

{

   struct svga_context *svga = svga_context( pipe );

   unsigned reduced_prim = u_reduced_prim( info->mode );

   unsigned count = info->count;

   enum pipe_error ret = 0;

   boolean needed_swtnl;

   svga->num_draw_calls++;  /* for SVGA_QUERY_DRAW_CALLS */

   if (!u_trim_pipe_prim( info->mode, &count ))

      return;

   /*

    * Mark currently bound target surfaces as dirty

    * doesn't really matter if it is done before drawing.

    *

    * TODO If we ever normaly return something other then

    * true we should not mark it as dirty then.

    */

   svga_mark_surfaces_dirty(svga_context(pipe));

   if (svga->curr.reduced_prim != reduced_prim) {

      svga->curr.reduced_prim = reduced_prim;

      svga->dirty |= SVGA_NEW_REDUCED_PRIMITIVE;

   }

   needed_swtnl = svga->state.sw.need_swtnl;

   svga_update_state_retry( svga, SVGA_STATE_NEED_SWTNL );

#ifdef DEBUG

   if (svga->curr.vs->base.id == svga->debug.disable_shader ||

       svga->curr.fs->base.id == svga->debug.disable_shader)

      return;

#endif

   if (svga->state.sw.need_swtnl) {

      svga->num_fallbacks++;  /* for SVGA_QUERY_FALLBACKS */

      if (!needed_swtnl) {

         /*

          * We're switching from HW to SW TNL.  SW TNL will require mapping all

          * currently bound vertex buffers, some of which may already be

          * referenced in the current command buffer as result of previous HW

          * TNL. So flush now, to prevent the context to flush while a referred

          * vertex buffer is mapped.

          */

         svga_context_flush(svga, NULL);

      }

      /* Avoid leaking the previous hwtnl bias to swtnl */

      svga_hwtnl_set_index_bias( svga->hwtnl, 0 );

      ret = svga_swtnl_draw_vbo( svga, info );

   }

   else {

      if (info->indexed && svga->curr.ib.buffer) {

         unsigned offset;

         assert(svga->curr.ib.offset % svga->curr.ib.index_size == 0);

         offset = svga->curr.ib.offset / svga->curr.ib.index_size;

         ret = retry_draw_range_elements( svga,

                                          svga->curr.ib.buffer,

                                          svga->curr.ib.index_size,

                                          info->index_bias,

                                          info->min_index,

                                          info->max_index,

                                          info->mode,

                                          info->start + offset,

                                          info->count,

                                          info->instance_count,

                                          TRUE );

      }

      else {

         ret = retry_draw_arrays( svga,

                                  info->mode,

                                  info->start,

                                  info->count,

                                  info->instance_count,

                                  TRUE );

      }

   }

   /* XXX: Silence warnings, do something sensible here? */

   (void)ret;

   svga_release_user_upl_buffers( svga );

   if (SVGA_DEBUG & DEBUG_FLUSH) {

      svga_hwtnl_flush_retry( svga );

      svga_context_flush(svga, NULL);

   }

}

void svga_init_draw_functions( struct svga_context *svga )

{

   svga->pipe.draw_vbo = svga_draw_vbo;

}