/**************************************************************************
 *
 * Copyright 2008 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.
 *
 **************************************************************************/

#include "pipe/p_util.h"
#include "draw/draw_context.h"
#include "draw/draw_private.h"
#include "draw/draw_pt.h"

#define FETCH_MAX 256
#define DRAW_MAX (16*FETCH_MAX)

struct varray_frontend {
   struct draw_pt_front_end base;
   struct draw_context *draw;

   ushort draw_elts[DRAW_MAX];
   unsigned fetch_elts[FETCH_MAX];

   unsigned draw_count;
   unsigned fetch_count;

   unsigned fetch_start;

   struct draw_pt_middle_end *middle;

   unsigned input_prim;
   unsigned output_prim;
};

static void varray_flush(struct varray_frontend *varray)
{
   if (varray->draw_count) {
#if 0
      debug_printf("FLUSH fc = %d, dc = %d\n",
                   varray->fetch_count,
                   varray->draw_count);
      debug_printf("\telt0 = %d, eltx = %d, draw0 = %d, drawx = %d\n",
                   varray->fetch_elts[0],
                   varray->fetch_elts[varray->fetch_count-1],
                   varray->draw_elts[0],
                   varray->draw_elts[varray->draw_count-1]);
#endif
      varray->middle->run(varray->middle,
                          varray->fetch_elts,
                          varray->fetch_count,
                          varray->draw_elts,
                          varray->draw_count);
   }

   varray->fetch_count = 0;
   varray->draw_count = 0;
}

static void varray_flush_linear(struct varray_frontend *varray,
                                unsigned start, unsigned count)
{
   if (count) {
#if 0
      debug_printf("FLUSH LINEAR start = %d, count = %d\n",
                   start,
                   count);
#endif
      assert(varray->middle->run_linear);
      varray->middle->run_linear(varray->middle, start, count);
   }
}

static INLINE void fetch_init(struct varray_frontend *varray,
                              unsigned count)
{
   unsigned idx;
#if 0
      debug_printf("FETCH INIT c = %d, fs = %d\n",
                   count,
                   varray->fetch_start);
#endif
   for (idx = 0; idx < count; ++idx) {
      varray->fetch_elts[idx] = varray->fetch_start + idx;
   }
   varray->fetch_start += idx;
   varray->fetch_count = idx;
}




static INLINE void add_draw_el(struct varray_frontend *varray,
                               int idx)
{
   varray->draw_elts[varray->draw_count++] = idx;
}


static INLINE void varray_triangle( struct varray_frontend *varray,
                                    unsigned i0,
                                    unsigned i1,
                                    unsigned i2 )
{
   add_draw_el(varray, i0);
   add_draw_el(varray, i1);
   add_draw_el(varray, i2);
}

static INLINE void varray_line( struct varray_frontend *varray,
                                unsigned i0,
                                unsigned i1 )
{
   add_draw_el(varray, i0);
   add_draw_el(varray, i1);
}


static INLINE void varray_point( struct varray_frontend *varray,
                                 unsigned i0 )
{
   add_draw_el(varray, i0);
}


#if 0
#define TRIANGLE(flags,i0,i1,i2)       varray_triangle(varray,i0,i1,i2)
#define LINE(flags,i0,i1)              varray_line(varray,i0,i1)
#define POINT(i0)                      varray_point(varray,i0)
#define FUNC varray_decompose
#include "draw_pt_decompose.h"
#else
#define TRIANGLE(vc,i0,i1,i2)       varray_triangle(vc,i0,i1,i2)
#define LINE(vc,i0,i1)              varray_line(vc,i0,i1)
#define POINT(vc,i0)                varray_point(vc,i0)
#define FUNC varray_run
#include "draw_pt_varray_tmp_linear.h"
#endif

static unsigned decompose_prim[PIPE_PRIM_POLYGON + 1] = {
   PIPE_PRIM_POINTS,
   PIPE_PRIM_LINES,
   PIPE_PRIM_LINES,             /* decomposed LINELOOP */
   PIPE_PRIM_LINE_STRIP,
   PIPE_PRIM_TRIANGLES,
   PIPE_PRIM_TRIANGLE_STRIP,
   PIPE_PRIM_TRIANGLES,         /* decomposed TRI_FAN */
   PIPE_PRIM_QUADS,
   PIPE_PRIM_QUAD_STRIP,
   PIPE_PRIM_TRIANGLES          /* decomposed POLYGON */
};



static void varray_prepare(struct draw_pt_front_end *frontend,
                           unsigned prim,
                           struct draw_pt_middle_end *middle,
                           unsigned opt)
{
   struct varray_frontend *varray = (struct varray_frontend *)frontend;

   varray->base.run = varray_run;

   varray->input_prim = prim;
   varray->output_prim = decompose_prim[prim];

   varray->middle = middle;
   middle->prepare(middle, varray->output_prim, opt);
}




static void varray_finish(struct draw_pt_front_end *frontend)
{
   struct varray_frontend *varray = (struct varray_frontend *)frontend;
   varray->middle->finish(varray->middle);
   varray->middle = NULL;
}

static void varray_destroy(struct draw_pt_front_end *frontend)
{
   FREE(frontend);
}


struct draw_pt_front_end *draw_pt_varray(struct draw_context *draw)
{
   struct varray_frontend *varray = CALLOC_STRUCT(varray_frontend);
   if (varray == NULL)
      return NULL;

   varray->base.prepare = varray_prepare;
   varray->base.run     = NULL;
   varray->base.finish  = varray_finish;
   varray->base.destroy = varray_destroy;
   varray->draw = draw;

   return &varray->base;
}
