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  1. /**************************************************************************
  2.  *
  3.  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
  4.  * All Rights Reserved.
  5.  *
  6.  * Permission is hereby granted, free of charge, to any person obtaining a
  7.  * copy of this software and associated documentation files (the
  8.  * "Software"), to deal in the Software without restriction, including
  9.  * without limitation the rights to use, copy, modify, merge, publish,
  10.  * distribute, sub license, and/or sell copies of the Software, and to
  11.  * permit persons to whom the Software is furnished to do so, subject to
  12.  * the following conditions:
  13.  *
  14.  * The above copyright notice and this permission notice (including the
  15.  * next paragraph) shall be included in all copies or substantial portions
  16.  * of the Software.
  17.  *
  18.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19.  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20.  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21.  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22.  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23.  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24.  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25.  *
  26.  **************************************************************************/
  27.  
  28.  /*
  29.   * Authors:
  30.   *   Keith Whitwell <keith@tungstengraphics.com>
  31.   */
  32.  
  33. #ifndef DRAW_PIPE_H
  34. #define DRAW_PIPE_H
  35.  
  36. #include "pipe/p_compiler.h"
  37. #include "draw_private.h"       /* for sizeof(vertex_header) */
  38.  
  39.  
  40. /**
  41.  * Basic info for a point/line/triangle primitive.
  42.  */
  43. struct prim_header {
  44.    float det;                 /**< front/back face determinant */
  45.    ushort flags;
  46.    ushort pad;
  47.    struct vertex_header *v[3];  /**< 1 to 3 vertex pointers */
  48. };
  49.  
  50.  
  51.  
  52. /**
  53.  * Base class for all primitive drawing stages.
  54.  */
  55. struct draw_stage
  56. {
  57.    struct draw_context *draw;   /**< parent context */
  58.  
  59.    struct draw_stage *next;     /**< next stage in pipeline */
  60.    const char *name;            /**< for debugging  */
  61.  
  62.    struct vertex_header **tmp;  /**< temp vert storage, such as for clipping */
  63.    unsigned nr_tmps;
  64.  
  65.    void (*point)( struct draw_stage *,
  66.                   struct prim_header * );
  67.  
  68.    void (*line)( struct draw_stage *,
  69.                  struct prim_header * );
  70.  
  71.    void (*tri)( struct draw_stage *,
  72.                 struct prim_header * );
  73.  
  74.    void (*flush)( struct draw_stage *,
  75.                   unsigned flags );
  76.  
  77.    void (*reset_stipple_counter)( struct draw_stage * );
  78.  
  79.    void (*destroy)( struct draw_stage * );
  80. };
  81.  
  82.  
  83. extern struct draw_stage *draw_unfilled_stage( struct draw_context *context );
  84. extern struct draw_stage *draw_twoside_stage( struct draw_context *context );
  85. extern struct draw_stage *draw_offset_stage( struct draw_context *context );
  86. extern struct draw_stage *draw_clip_stage( struct draw_context *context );
  87. extern struct draw_stage *draw_flatshade_stage( struct draw_context *context );
  88. extern struct draw_stage *draw_cull_stage( struct draw_context *context );
  89. extern struct draw_stage *draw_stipple_stage( struct draw_context *context );
  90. extern struct draw_stage *draw_wide_line_stage( struct draw_context *context );
  91. extern struct draw_stage *draw_wide_point_stage( struct draw_context *context );
  92. extern struct draw_stage *draw_validate_stage( struct draw_context *context );
  93.  
  94.  
  95. extern void draw_free_temp_verts( struct draw_stage *stage );
  96. extern boolean draw_alloc_temp_verts( struct draw_stage *stage, unsigned nr );
  97.  
  98. extern void draw_reset_vertex_ids( struct draw_context *draw );
  99.  
  100. void draw_pipe_passthrough_tri(struct draw_stage *stage, struct prim_header *header);
  101. void draw_pipe_passthrough_line(struct draw_stage *stage, struct prim_header *header);
  102. void draw_pipe_passthrough_point(struct draw_stage *stage, struct prim_header *header);
  103.  
  104.  
  105.  
  106. /**
  107.  * Get a writeable copy of a vertex.
  108.  * \param stage  drawing stage info
  109.  * \param vert  the vertex to copy (source)
  110.  * \param idx  index into stage's tmp[] array to put the copy (dest)
  111.  * \return  pointer to the copied vertex
  112.  */
  113. static INLINE struct vertex_header *
  114. dup_vert( struct draw_stage *stage,
  115.           const struct vertex_header *vert,
  116.           unsigned idx )
  117. {  
  118.    struct vertex_header *tmp = stage->tmp[idx];
  119.    const uint vsize = sizeof(struct vertex_header)
  120.       + stage->draw->vs.num_vs_outputs * 4 * sizeof(float);
  121.    memcpy(tmp, vert, vsize);
  122.    tmp->vertex_id = UNDEFINED_VERTEX_ID;
  123.    return tmp;
  124. }
  125.  
  126. #endif
  127.