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

 *

 * 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:

  *   Keith Whitwell 

  */

#include "draw/draw_private.h"

#include "draw/draw_pipe.h"

#include "util/u_debug.h"

#include "util/u_math.h"

boolean draw_pipeline_init( struct draw_context *draw )

{

   /* create pipeline stages */

   draw->pipeline.wide_line  = draw_wide_line_stage( draw );

   draw->pipeline.wide_point = draw_wide_point_stage( draw );

   draw->pipeline.stipple   = draw_stipple_stage( draw );

   draw->pipeline.unfilled  = draw_unfilled_stage( draw );

   draw->pipeline.twoside   = draw_twoside_stage( draw );

   draw->pipeline.offset    = draw_offset_stage( draw );

   draw->pipeline.clip      = draw_clip_stage( draw );

   draw->pipeline.flatshade = draw_flatshade_stage( draw );

   draw->pipeline.cull      = draw_cull_stage( draw );

   draw->pipeline.validate  = draw_validate_stage( draw );

   draw->pipeline.first     = draw->pipeline.validate;

   if (!draw->pipeline.wide_line ||

       !draw->pipeline.wide_point ||

       !draw->pipeline.stipple ||

       !draw->pipeline.unfilled ||

       !draw->pipeline.twoside ||

       !draw->pipeline.offset ||

       !draw->pipeline.clip ||

       !draw->pipeline.flatshade ||

       !draw->pipeline.cull ||

       !draw->pipeline.validate)

      return FALSE;

   /* these defaults are oriented toward the needs of softpipe */

   draw->pipeline.wide_point_threshold = 1000000.0f; /* infinity */

   draw->pipeline.wide_line_threshold = 1.0f;

   draw->pipeline.wide_point_sprites = FALSE;

   draw->pipeline.line_stipple = TRUE;

   draw->pipeline.point_sprite = TRUE;

   return TRUE;

}

void draw_pipeline_destroy( struct draw_context *draw )

{

   if (draw->pipeline.wide_line)

      draw->pipeline.wide_line->destroy( draw->pipeline.wide_line );

   if (draw->pipeline.wide_point)

      draw->pipeline.wide_point->destroy( draw->pipeline.wide_point );

   if (draw->pipeline.stipple)

      draw->pipeline.stipple->destroy( draw->pipeline.stipple );

   if (draw->pipeline.unfilled)

      draw->pipeline.unfilled->destroy( draw->pipeline.unfilled );

   if (draw->pipeline.twoside)

      draw->pipeline.twoside->destroy( draw->pipeline.twoside );

   if (draw->pipeline.offset)

      draw->pipeline.offset->destroy( draw->pipeline.offset );

   if (draw->pipeline.clip)

      draw->pipeline.clip->destroy( draw->pipeline.clip );

   if (draw->pipeline.flatshade)

      draw->pipeline.flatshade->destroy( draw->pipeline.flatshade );

   if (draw->pipeline.cull)

      draw->pipeline.cull->destroy( draw->pipeline.cull );

   if (draw->pipeline.validate)

      draw->pipeline.validate->destroy( draw->pipeline.validate );

   if (draw->pipeline.aaline)

      draw->pipeline.aaline->destroy( draw->pipeline.aaline );

   if (draw->pipeline.aapoint)

      draw->pipeline.aapoint->destroy( draw->pipeline.aapoint );

   if (draw->pipeline.pstipple)

      draw->pipeline.pstipple->destroy( draw->pipeline.pstipple );

   if (draw->pipeline.rasterize)

      draw->pipeline.rasterize->destroy( draw->pipeline.rasterize );

}

/**

 * Build primitive to render a point with vertex at v0.

 */

static void do_point( struct draw_context *draw,

		      const char *v0 )

{

   struct prim_header prim;

   prim.flags = 0;

   prim.pad = 0;

   prim.v[0] = (struct vertex_header *)v0;

   draw->pipeline.first->point( draw->pipeline.first, &prim );

}

/**

 * Build primitive to render a line with vertices at v0, v1.

 * \param flags  bitmask of DRAW_PIPE_EDGE_x, DRAW_PIPE_RESET_STIPPLE

 */

static void do_line( struct draw_context *draw,

                     ushort flags,

		     const char *v0,

		     const char *v1 )

{

   struct prim_header prim;

   prim.flags = flags;

   prim.pad = 0;

   prim.v[0] = (struct vertex_header *)v0;

   prim.v[1] = (struct vertex_header *)v1;

   draw->pipeline.first->line( draw->pipeline.first, &prim );

}

/**

 * Build primitive to render a triangle with vertices at v0, v1, v2.

 * \param flags  bitmask of DRAW_PIPE_EDGE_x, DRAW_PIPE_RESET_STIPPLE

 */

static void do_triangle( struct draw_context *draw,

                         ushort flags,

			 char *v0,

			 char *v1,

			 char *v2 )

{

   struct prim_header prim;

   prim.v[0] = (struct vertex_header *)v0;

   prim.v[1] = (struct vertex_header *)v1;

   prim.v[2] = (struct vertex_header *)v2;

   prim.flags = flags;

   prim.pad = 0;

   draw->pipeline.first->tri( draw->pipeline.first, &prim );

}

/*

 * Set up macros for draw_pt_decompose.h template code.

 * This code uses vertex indexes / elements.

 */

#define TRIANGLE(flags,i0,i1,i2)                                  \

   do {                                                           \

      do_triangle( draw,                                          \

                   flags,                                         \

                   verts + stride * (i0),                         \

                   verts + stride * (i1),                         \

                   verts + stride * (i2) );                       \

   } while (0)

#define LINE(flags,i0,i1)                                         \

   do {                                                           \

      do_line( draw,                                              \

               flags,                                             \

               verts + stride * (i0),                             \

               verts + stride * (i1) );                           \

   } while (0)

#define POINT(i0)                               \

   do {                                         \

      do_point( draw, verts + stride * (i0) );  \

   } while (0)

#define GET_ELT(idx) (MIN2(elts[idx], max_index))

#define FUNC pipe_run_elts

#define FUNC_VARS                               \

    struct draw_context *draw,                  \

    unsigned prim,                              \

    unsigned prim_flags,                        \

    struct vertex_header *vertices,             \

    unsigned stride,                            \

    const ushort *elts,                         \

    unsigned count,                             \

    unsigned max_index

#include "draw_pt_decompose.h"

/**

 * Code to run the pipeline on a fairly arbitrary collection of vertices.

 * For drawing indexed primitives.

 *

 * Vertex headers must be pre-initialized with the

 * UNDEFINED_VERTEX_ID, this code will cause that id to become

 * overwritten, so it may have to be reset if there is the intention

 * to reuse the vertices.

 *

 * This code provides a callback to reset the vertex id's which the

 * draw_vbuf.c code uses when it has to perform a flush.

 */

void draw_pipeline_run( struct draw_context *draw,

                        const struct draw_vertex_info *vert_info,

                        const struct draw_prim_info *prim_info)

{

   unsigned i, start;

   draw->pipeline.verts = (char *)vert_info->verts;

   draw->pipeline.vertex_stride = vert_info->stride;

   draw->pipeline.vertex_count = vert_info->count;

   for (start = i = 0;

        i < prim_info->primitive_count;

        start += prim_info->primitive_lengths[i], i++)

   {

      const unsigned count = prim_info->primitive_lengths[i];

#if DEBUG

      /* Warn if one of the element indexes go outside the vertex buffer */

      {

         unsigned max_index = 0x0, i;

         /* find the largest element index */

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

            unsigned int index = prim_info->elts[start + i];

            if (index > max_index)

               max_index = index;

         }

         if (max_index >= vert_info->count) {

            debug_printf("%s: max_index (%u) outside vertex buffer (%u)\n",

                         __FUNCTION__,

                         max_index,

                         vert_info->count);

         }

      }

#endif

      pipe_run_elts(draw,

                    prim_info->prim,

                    prim_info->flags,

                    vert_info->verts,

                    vert_info->stride,

                    prim_info->elts + start,

                    count,

                    vert_info->count - 1);

   }

   draw->pipeline.verts = NULL;

   draw->pipeline.vertex_count = 0;

}

/*

 * Set up macros for draw_pt_decompose.h template code.

 * This code is for non-indexed (aka linear) rendering (no elts).

 */

#define TRIANGLE(flags,i0,i1,i2)       \

   do_triangle( draw, flags,           \

                verts + stride * (i0), \

                verts + stride * (i1), \

                verts + stride * (i2) )

#define LINE(flags,i0,i1)              \

   do_line( draw, flags,               \

            verts + stride * (i0),     \

            verts + stride * (i1) )

#define POINT(i0)                      \

   do_point( draw, verts + stride * (i0) )

#define GET_ELT(idx) (idx)

#define FUNC pipe_run_linear

#define FUNC_VARS                      \

    struct draw_context *draw,         \

    unsigned prim,                     \

    unsigned prim_flags,               \

    struct vertex_header *vertices,    \

    unsigned stride,                   \

    unsigned count

#include "draw_pt_decompose.h"

/*

 * For drawing non-indexed primitives.

 */

void draw_pipeline_run_linear( struct draw_context *draw,

                               const struct draw_vertex_info *vert_info,

                               const struct draw_prim_info *prim_info)

{

   unsigned i, start;

   for (start = i = 0;

        i < prim_info->primitive_count;

        start += prim_info->primitive_lengths[i], i++)

   {

      unsigned count = prim_info->primitive_lengths[i];

      char *verts = ((char*)vert_info->verts) +

                    (start * vert_info->stride);

      draw->pipeline.verts = verts;

      draw->pipeline.vertex_stride = vert_info->stride;

      draw->pipeline.vertex_count = count;

      assert(count <= vert_info->count);

      pipe_run_linear(draw,

                      prim_info->prim,

                      prim_info->flags,

                      (struct vertex_header*)verts,

                      vert_info->stride,

                      count);

   }

   draw->pipeline.verts = NULL;

   draw->pipeline.vertex_count = 0;

}

void draw_pipeline_flush( struct draw_context *draw,

                          unsigned flags )

{

   draw->pipeline.first->flush( draw->pipeline.first, flags );

   if (flags & DRAW_FLUSH_STATE_CHANGE)

      draw->pipeline.first = draw->pipeline.validate;

}