src/mesa/pipe/softpipe/sp_headers.h

   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
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   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
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  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
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  26  **************************************************************************/
  27
  28 /* Authors:  Keith Whitwell <keith@tungstengraphics.com>
  29  */
  30
  31 #ifndef SP_HEADERS_H
  32 #define SP_HEADERS_H
  33
  34 #include "../tgsi/exec/tgsi_core.h"
  35
  36 #define PRIM_POINT 1
  37 #define PRIM_LINE  2
  38 #define PRIM_TRI   3
  39
  40
  41 /* The rasterizer generates 2x2 quads of fragment and feeds them to
  42  * the current fp_machine (see below).
  43  */
  44 #define QUAD_BOTTOM_LEFT  0
  45 #define QUAD_BOTTOM_RIGHT 1
  46 #define QUAD_TOP_LEFT     2
  47 #define QUAD_TOP_RIGHT    3
  48
  49 #define MASK_BOTTOM_LEFT  0x1
  50 #define MASK_BOTTOM_RIGHT 0x2
  51 #define MASK_TOP_LEFT     0x4
  52 #define MASK_TOP_RIGHT    0x8
  53 #define MASK_ALL          0xf
  54
  55
  56 /**
  57  * Encodes everything we need to know about a 2x2 pixel block.  Uses
  58  * "Channel-Serial" or "SoA" layout.
  59  */
  60 struct quad_header {
  61    int x0;
  62    int y0;
  63    unsigned mask:4;
  64    unsigned facing:1;   /**< Front (0) or back (1) facing? */
  65    unsigned prim:2;     /**< PRIM_POINT, LINE, TRI */
  66
  67    struct {
  68       float color[NUM_CHANNELS][QUAD_SIZE];     /* rrrr, gggg, bbbb, aaaa */
  69       float depth[QUAD_SIZE];
  70    } outputs;
  71
  72    float coverage[QUAD_SIZE];    /** fragment coverage for antialiasing */
  73
  74    const struct tgsi_interp_coef *coef;
  75
  76    unsigned nr_attrs;
  77 };
  78
  79
  80 #endif /* SP_HEADERS_H */