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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_inlines.h"

#include "pipe/p_defines.h"

#include "util/u_math.h"

#include "util/u_upload_mgr.h"

#include "svga_context.h"

#include "svga_state.h"

#include "svga_draw.h"

#include "svga_tgsi.h"

#include "svga_screen.h"

#include "svga_resource_buffer.h"

#include "svga_hw_reg.h"

static enum pipe_error

emit_hw_vs_vdecl(struct svga_context *svga, unsigned dirty)

{

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

   SVGA3dVertexDecl decl;

   unsigned i;

   unsigned neg_bias = 0;

   assert(svga->curr.velems->count >=

          svga->curr.vs->base.info.file_count[TGSI_FILE_INPUT]);

   svga_hwtnl_reset_vdecl( svga->hwtnl,

                           svga->curr.velems->count );

   /**

    * We can't set the VDECL offset to something negative, so we

    * must calculate a common negative additional index bias, and modify

    * the VDECL offsets accordingly so they *all* end up positive.

    *

    * Note that the exact value of the negative index bias is not that

    * important, since we compensate for it when we calculate the vertex

    * buffer offset below. The important thing is that all vertex buffer

    * offsets remain positive.

    *

    * Note that we use a negative bias variable in order to make the

    * rounding maths more easy to follow, and to avoid int / unsigned

    * confusion.

    */

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

      const struct pipe_vertex_buffer *vb =

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

      struct svga_buffer *buffer;

      unsigned int offset = vb->buffer_offset + ve[i].src_offset;

      unsigned tmp_neg_bias = 0;

      if (!vb->buffer)

         continue;

      buffer = svga_buffer(vb->buffer);

      if (buffer->uploaded.start > offset) {

         tmp_neg_bias = buffer->uploaded.start - offset;

         if (vb->stride)

            tmp_neg_bias = (tmp_neg_bias + vb->stride - 1) / vb->stride;

         neg_bias = MAX2(neg_bias, tmp_neg_bias);

      }

   }

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

      const struct pipe_vertex_buffer *vb =

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

      unsigned usage, index;

      struct svga_buffer *buffer;

      if (!vb->buffer)

         continue;

      buffer= svga_buffer(vb->buffer);

      svga_generate_vdecl_semantics( i, &usage, &index );

      /* SVGA_NEW_VELEMENT

       */

      decl.identity.type = svga->state.sw.ve_format[i];

      decl.identity.method = SVGA3D_DECLMETHOD_DEFAULT;

      decl.identity.usage = usage;

      decl.identity.usageIndex = index;

      decl.array.stride = vb->stride;

      /* Compensate for partially uploaded vbo, and

       * for the negative index bias.

       */

      decl.array.offset = (vb->buffer_offset

                           + ve[i].src_offset

			   + neg_bias * vb->stride

			   - buffer->uploaded.start);

      assert(decl.array.offset >= 0);

      svga_hwtnl_vdecl( svga->hwtnl,

                        i,

                        &decl,

                        buffer->uploaded.buffer ? buffer->uploaded.buffer :

                        vb->buffer );

   }

   svga_hwtnl_set_index_bias( svga->hwtnl, -(int) neg_bias );

   return PIPE_OK;

}

static enum pipe_error

emit_hw_vdecl(struct svga_context *svga, unsigned dirty)

{

   /* SVGA_NEW_NEED_SWTNL

    */

   if (svga->state.sw.need_swtnl)

      return PIPE_OK; /* Do not emit during swtnl */

   return emit_hw_vs_vdecl( svga, dirty );

}

struct svga_tracked_state svga_hw_vdecl =

{

   "hw vertex decl state (hwtnl version)",

   ( SVGA_NEW_NEED_SWTNL |

     SVGA_NEW_VELEMENT |

     SVGA_NEW_VBUFFER |

     SVGA_NEW_RAST |

     SVGA_NEW_FS |

     SVGA_NEW_VS ),

   emit_hw_vdecl

};